/* Display generation from window structure and buffer text.
Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995,
1997, 1998, 1999, 2000, 2001, 2002, 2003,
2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see . */
/* New redisplay written by Gerd Moellmann .
Redisplay.
Emacs separates the task of updating the display from code
modifying global state, e.g. buffer text. This way functions
operating on buffers don't also have to be concerned with updating
the display.
Updating the display is triggered by the Lisp interpreter when it
decides it's time to do it. This is done either automatically for
you as part of the interpreter's command loop or as the result of
calling Lisp functions like `sit-for'. The C function `redisplay'
in xdisp.c is the only entry into the inner redisplay code. (Or,
let's say almost---see the description of direct update
operations, below.)
The following diagram shows how redisplay code is invoked. As you
can see, Lisp calls redisplay and vice versa. Under window systems
like X, some portions of the redisplay code are also called
asynchronously during mouse movement or expose events. It is very
important that these code parts do NOT use the C library (malloc,
free) because many C libraries under Unix are not reentrant. They
may also NOT call functions of the Lisp interpreter which could
change the interpreter's state. If you don't follow these rules,
you will encounter bugs which are very hard to explain.
(Direct functions, see below)
direct_output_for_insert,
direct_forward_char (dispnew.c)
+---------------------------------+
| |
| V
+--------------+ redisplay +----------------+
| Lisp machine |---------------->| Redisplay code |<--+
+--------------+ (xdisp.c) +----------------+ |
^ | |
+----------------------------------+ |
Don't use this path when called |
asynchronously! |
|
expose_window (asynchronous) |
|
X expose events -----+
What does redisplay do? Obviously, it has to figure out somehow what
has been changed since the last time the display has been updated,
and to make these changes visible. Preferably it would do that in
a moderately intelligent way, i.e. fast.
Changes in buffer text can be deduced from window and buffer
structures, and from some global variables like `beg_unchanged' and
`end_unchanged'. The contents of the display are additionally
recorded in a `glyph matrix', a two-dimensional matrix of glyph
structures. Each row in such a matrix corresponds to a line on the
display, and each glyph in a row corresponds to a column displaying
a character, an image, or what else. This matrix is called the
`current glyph matrix' or `current matrix' in redisplay
terminology.
For buffer parts that have been changed since the last update, a
second glyph matrix is constructed, the so called `desired glyph
matrix' or short `desired matrix'. Current and desired matrix are
then compared to find a cheap way to update the display, e.g. by
reusing part of the display by scrolling lines.
Direct operations.
You will find a lot of redisplay optimizations when you start
looking at the innards of redisplay. The overall goal of all these
optimizations is to make redisplay fast because it is done
frequently.
Two optimizations are not found in xdisp.c. These are the direct
operations mentioned above. As the name suggests they follow a
different principle than the rest of redisplay. Instead of
building a desired matrix and then comparing it with the current
display, they perform their actions directly on the display and on
the current matrix.
One direct operation updates the display after one character has
been entered. The other one moves the cursor by one position
forward or backward. You find these functions under the names
`direct_output_for_insert' and `direct_output_forward_char' in
dispnew.c.
Desired matrices.
Desired matrices are always built per Emacs window. The function
`display_line' is the central function to look at if you are
interested. It constructs one row in a desired matrix given an
iterator structure containing both a buffer position and a
description of the environment in which the text is to be
displayed. But this is too early, read on.
Characters and pixmaps displayed for a range of buffer text depend
on various settings of buffers and windows, on overlays and text
properties, on display tables, on selective display. The good news
is that all this hairy stuff is hidden behind a small set of
interface functions taking an iterator structure (struct it)
argument.
Iteration over things to be displayed is then simple. It is
started by initializing an iterator with a call to init_iterator.
Calls to get_next_display_element fill the iterator structure with
relevant information about the next thing to display. Calls to
set_iterator_to_next move the iterator to the next thing.
Besides this, an iterator also contains information about the
display environment in which glyphs for display elements are to be
produced. It has fields for the width and height of the display,
the information whether long lines are truncated or continued, a
current X and Y position, and lots of other stuff you can better
see in dispextern.h.
Glyphs in a desired matrix are normally constructed in a loop
calling get_next_display_element and then produce_glyphs. The call
to produce_glyphs will fill the iterator structure with pixel
information about the element being displayed and at the same time
produce glyphs for it. If the display element fits on the line
being displayed, set_iterator_to_next is called next, otherwise the
glyphs produced are discarded.
Frame matrices.
That just couldn't be all, could it? What about terminal types not
supporting operations on sub-windows of the screen? To update the
display on such a terminal, window-based glyph matrices are not
well suited. To be able to reuse part of the display (scrolling
lines up and down), we must instead have a view of the whole
screen. This is what `frame matrices' are for. They are a trick.
Frames on terminals like above have a glyph pool. Windows on such
a frame sub-allocate their glyph memory from their frame's glyph
pool. The frame itself is given its own glyph matrices. By
coincidence---or maybe something else---rows in window glyph
matrices are slices of corresponding rows in frame matrices. Thus
writing to window matrices implicitly updates a frame matrix which
provides us with the view of the whole screen that we originally
wanted to have without having to move many bytes around. To be
honest, there is a little bit more done, but not much more. If you
plan to extend that code, take a look at dispnew.c. The function
build_frame_matrix is a good starting point. */
#include
#include
#include
#include
#include "lisp.h"
#include "keyboard.h"
#include "frame.h"
#include "window.h"
#include "termchar.h"
#include "dispextern.h"
#include "buffer.h"
#include "character.h"
#include "charset.h"
#include "indent.h"
#include "commands.h"
#include "keymap.h"
#include "macros.h"
#include "disptab.h"
#include "termhooks.h"
#include "intervals.h"
#include "coding.h"
#include "process.h"
#include "region-cache.h"
#include "font.h"
#include "fontset.h"
#include "blockinput.h"
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif
#ifdef WINDOWSNT
#include "w32term.h"
#endif
#ifdef HAVE_NS
#include "nsterm.h"
#endif
#ifdef USE_GTK
#include "gtkutil.h"
#endif
#include "font.h"
#ifndef FRAME_X_OUTPUT
#define FRAME_X_OUTPUT(f) ((f)->output_data.x)
#endif
#define INFINITY 10000000
#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) \
|| defined(HAVE_NS) || defined (USE_GTK)
extern void set_frame_menubar P_ ((struct frame *f, int, int));
extern int pending_menu_activation;
#endif
extern int interrupt_input;
extern int command_loop_level;
extern Lisp_Object do_mouse_tracking;
extern int minibuffer_auto_raise;
extern Lisp_Object Vminibuffer_list;
extern Lisp_Object Qface;
extern Lisp_Object Qmode_line, Qmode_line_inactive, Qheader_line;
extern Lisp_Object Voverriding_local_map;
extern Lisp_Object Voverriding_local_map_menu_flag;
extern Lisp_Object Qmenu_item;
extern Lisp_Object Qwhen;
extern Lisp_Object Qhelp_echo;
extern Lisp_Object Qbefore_string, Qafter_string;
Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map;
Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
Lisp_Object Qwindow_text_change_functions, Vwindow_text_change_functions;
Lisp_Object Qredisplay_end_trigger_functions, Vredisplay_end_trigger_functions;
Lisp_Object Qinhibit_point_motion_hooks;
Lisp_Object QCeval, QCfile, QCdata, QCpropertize;
Lisp_Object Qfontified;
Lisp_Object Qgrow_only;
Lisp_Object Qinhibit_eval_during_redisplay;
Lisp_Object Qbuffer_position, Qposition, Qobject;
/* Cursor shapes */
Lisp_Object Qbar, Qhbar, Qbox, Qhollow;
/* Pointer shapes */
Lisp_Object Qarrow, Qhand, Qtext;
Lisp_Object Qrisky_local_variable;
/* Holds the list (error). */
Lisp_Object list_of_error;
/* Functions called to fontify regions of text. */
Lisp_Object Vfontification_functions;
Lisp_Object Qfontification_functions;
/* Non-nil means automatically select any window when the mouse
cursor moves into it. */
Lisp_Object Vmouse_autoselect_window;
Lisp_Object Vwrap_prefix, Qwrap_prefix;
Lisp_Object Vline_prefix, Qline_prefix;
/* Non-zero means draw tool bar buttons raised when the mouse moves
over them. */
int auto_raise_tool_bar_buttons_p;
/* Non-zero means to reposition window if cursor line is only partially visible. */
int make_cursor_line_fully_visible_p;
/* Margin below tool bar in pixels. 0 or nil means no margin.
If value is `internal-border-width' or `border-width',
the corresponding frame parameter is used. */
Lisp_Object Vtool_bar_border;
/* Margin around tool bar buttons in pixels. */
Lisp_Object Vtool_bar_button_margin;
/* Thickness of shadow to draw around tool bar buttons. */
EMACS_INT tool_bar_button_relief;
/* Non-nil means automatically resize tool-bars so that all tool-bar
items are visible, and no blank lines remain.
If value is `grow-only', only make tool-bar bigger. */
Lisp_Object Vauto_resize_tool_bars;
/* Non-zero means draw block and hollow cursor as wide as the glyph
under it. For example, if a block cursor is over a tab, it will be
drawn as wide as that tab on the display. */
int x_stretch_cursor_p;
/* Non-nil means don't actually do any redisplay. */
Lisp_Object Vinhibit_redisplay, Qinhibit_redisplay;
/* Non-zero means Lisp evaluation during redisplay is inhibited. */
int inhibit_eval_during_redisplay;
/* Names of text properties relevant for redisplay. */
Lisp_Object Qdisplay;
extern Lisp_Object Qface, Qinvisible, Qwidth;
/* Symbols used in text property values. */
Lisp_Object Vdisplay_pixels_per_inch;
Lisp_Object Qspace, QCalign_to, QCrelative_width, QCrelative_height;
Lisp_Object Qleft_margin, Qright_margin, Qspace_width, Qraise;
Lisp_Object Qslice;
Lisp_Object Qcenter;
Lisp_Object Qmargin, Qpointer;
Lisp_Object Qline_height;
extern Lisp_Object Qheight;
extern Lisp_Object QCwidth, QCheight, QCascent;
extern Lisp_Object Qscroll_bar;
extern Lisp_Object Qcursor;
/* Non-nil means highlight trailing whitespace. */
Lisp_Object Vshow_trailing_whitespace;
/* Non-nil means escape non-break space and hyphens. */
Lisp_Object Vnobreak_char_display;
#ifdef HAVE_WINDOW_SYSTEM
extern Lisp_Object Voverflow_newline_into_fringe;
/* Test if overflow newline into fringe. Called with iterator IT
at or past right window margin, and with IT->current_x set. */
#define IT_OVERFLOW_NEWLINE_INTO_FRINGE(it) \
(!NILP (Voverflow_newline_into_fringe) \
&& FRAME_WINDOW_P (it->f) \
&& WINDOW_RIGHT_FRINGE_WIDTH (it->w) > 0 \
&& it->current_x == it->last_visible_x \
&& it->line_wrap != WORD_WRAP)
#else /* !HAVE_WINDOW_SYSTEM */
#define IT_OVERFLOW_NEWLINE_INTO_FRINGE(it) 0
#endif /* HAVE_WINDOW_SYSTEM */
/* Test if the display element loaded in IT is a space or tab
character. This is used to determine word wrapping. */
#define IT_DISPLAYING_WHITESPACE(it) \
(it->what == IT_CHARACTER && (it->c == ' ' || it->c == '\t'))
/* Non-nil means show the text cursor in void text areas
i.e. in blank areas after eol and eob. This used to be
the default in 21.3. */
Lisp_Object Vvoid_text_area_pointer;
/* Name of the face used to highlight trailing whitespace. */
Lisp_Object Qtrailing_whitespace;
/* Name and number of the face used to highlight escape glyphs. */
Lisp_Object Qescape_glyph;
/* Name and number of the face used to highlight non-breaking spaces. */
Lisp_Object Qnobreak_space;
/* The symbol `image' which is the car of the lists used to represent
images in Lisp. */
Lisp_Object Qimage;
/* The image map types. */
Lisp_Object QCmap, QCpointer;
Lisp_Object Qrect, Qcircle, Qpoly;
/* Non-zero means print newline to stdout before next mini-buffer
message. */
int noninteractive_need_newline;
/* Non-zero means print newline to message log before next message. */
static int message_log_need_newline;
/* Three markers that message_dolog uses.
It could allocate them itself, but that causes trouble
in handling memory-full errors. */
static Lisp_Object message_dolog_marker1;
static Lisp_Object message_dolog_marker2;
static Lisp_Object message_dolog_marker3;
/* The buffer position of the first character appearing entirely or
partially on the line of the selected window which contains the
cursor; <= 0 if not known. Set by set_cursor_from_row, used for
redisplay optimization in redisplay_internal. */
static struct text_pos this_line_start_pos;
/* Number of characters past the end of the line above, including the
terminating newline. */
static struct text_pos this_line_end_pos;
/* The vertical positions and the height of this line. */
static int this_line_vpos;
static int this_line_y;
static int this_line_pixel_height;
/* X position at which this display line starts. Usually zero;
negative if first character is partially visible. */
static int this_line_start_x;
/* Buffer that this_line_.* variables are referring to. */
static struct buffer *this_line_buffer;
/* Nonzero means truncate lines in all windows less wide than the
frame. */
Lisp_Object Vtruncate_partial_width_windows;
/* A flag to control how to display unibyte 8-bit character. */
int unibyte_display_via_language_environment;
/* Nonzero means we have more than one non-mini-buffer-only frame.
Not guaranteed to be accurate except while parsing
frame-title-format. */
int multiple_frames;
Lisp_Object Vglobal_mode_string;
/* List of variables (symbols) which hold markers for overlay arrows.
The symbols on this list are examined during redisplay to determine
where to display overlay arrows. */
Lisp_Object Voverlay_arrow_variable_list;
/* Marker for where to display an arrow on top of the buffer text. */
Lisp_Object Voverlay_arrow_position;
/* String to display for the arrow. Only used on terminal frames. */
Lisp_Object Voverlay_arrow_string;
/* Values of those variables at last redisplay are stored as
properties on `overlay-arrow-position' symbol. However, if
Voverlay_arrow_position is a marker, last-arrow-position is its
numerical position. */
Lisp_Object Qlast_arrow_position, Qlast_arrow_string;
/* Alternative overlay-arrow-string and overlay-arrow-bitmap
properties on a symbol in overlay-arrow-variable-list. */
Lisp_Object Qoverlay_arrow_string, Qoverlay_arrow_bitmap;
/* Like mode-line-format, but for the title bar on a visible frame. */
Lisp_Object Vframe_title_format;
/* Like mode-line-format, but for the title bar on an iconified frame. */
Lisp_Object Vicon_title_format;
/* List of functions to call when a window's size changes. These
functions get one arg, a frame on which one or more windows' sizes
have changed. */
static Lisp_Object Vwindow_size_change_functions;
Lisp_Object Qmenu_bar_update_hook, Vmenu_bar_update_hook;
/* Nonzero if an overlay arrow has been displayed in this window. */
static int overlay_arrow_seen;
/* Nonzero means highlight the region even in nonselected windows. */
int highlight_nonselected_windows;
/* If cursor motion alone moves point off frame, try scrolling this
many lines up or down if that will bring it back. */
static EMACS_INT scroll_step;
/* Nonzero means scroll just far enough to bring point back on the
screen, when appropriate. */
static EMACS_INT scroll_conservatively;
/* Recenter the window whenever point gets within this many lines of
the top or bottom of the window. This value is translated into a
pixel value by multiplying it with FRAME_LINE_HEIGHT, which means
that there is really a fixed pixel height scroll margin. */
EMACS_INT scroll_margin;
/* Number of windows showing the buffer of the selected window (or
another buffer with the same base buffer). keyboard.c refers to
this. */
int buffer_shared;
/* Vector containing glyphs for an ellipsis `...'. */
static Lisp_Object default_invis_vector[3];
/* Zero means display the mode-line/header-line/menu-bar in the default face
(this slightly odd definition is for compatibility with previous versions
of emacs), non-zero means display them using their respective faces.
This variable is deprecated. */
int mode_line_inverse_video;
/* Prompt to display in front of the mini-buffer contents. */
Lisp_Object minibuf_prompt;
/* Width of current mini-buffer prompt. Only set after display_line
of the line that contains the prompt. */
int minibuf_prompt_width;
/* This is the window where the echo area message was displayed. It
is always a mini-buffer window, but it may not be the same window
currently active as a mini-buffer. */
Lisp_Object echo_area_window;
/* List of pairs (MESSAGE . MULTIBYTE). The function save_message
pushes the current message and the value of
message_enable_multibyte on the stack, the function restore_message
pops the stack and displays MESSAGE again. */
Lisp_Object Vmessage_stack;
/* Nonzero means multibyte characters were enabled when the echo area
message was specified. */
int message_enable_multibyte;
/* Nonzero if we should redraw the mode lines on the next redisplay. */
int update_mode_lines;
/* Nonzero if window sizes or contents have changed since last
redisplay that finished. */
int windows_or_buffers_changed;
/* Nonzero means a frame's cursor type has been changed. */
int cursor_type_changed;
/* Nonzero after display_mode_line if %l was used and it displayed a
line number. */
int line_number_displayed;
/* Maximum buffer size for which to display line numbers. */
Lisp_Object Vline_number_display_limit;
/* Line width to consider when repositioning for line number display. */
static EMACS_INT line_number_display_limit_width;
/* Number of lines to keep in the message log buffer. t means
infinite. nil means don't log at all. */
Lisp_Object Vmessage_log_max;
/* The name of the *Messages* buffer, a string. */
static Lisp_Object Vmessages_buffer_name;
/* Current, index 0, and last displayed echo area message. Either
buffers from echo_buffers, or nil to indicate no message. */
Lisp_Object echo_area_buffer[2];
/* The buffers referenced from echo_area_buffer. */
static Lisp_Object echo_buffer[2];
/* A vector saved used in with_area_buffer to reduce consing. */
static Lisp_Object Vwith_echo_area_save_vector;
/* Non-zero means display_echo_area should display the last echo area
message again. Set by redisplay_preserve_echo_area. */
static int display_last_displayed_message_p;
/* Nonzero if echo area is being used by print; zero if being used by
message. */
int message_buf_print;
/* The symbol `inhibit-menubar-update' and its DEFVAR_BOOL variable. */
Lisp_Object Qinhibit_menubar_update;
int inhibit_menubar_update;
/* When evaluating expressions from menu bar items (enable conditions,
for instance), this is the frame they are being processed for. */
Lisp_Object Vmenu_updating_frame;
/* Maximum height for resizing mini-windows. Either a float
specifying a fraction of the available height, or an integer
specifying a number of lines. */
Lisp_Object Vmax_mini_window_height;
/* Non-zero means messages should be displayed with truncated
lines instead of being continued. */
int message_truncate_lines;
Lisp_Object Qmessage_truncate_lines;
/* Set to 1 in clear_message to make redisplay_internal aware
of an emptied echo area. */
static int message_cleared_p;
/* How to blink the default frame cursor off. */
Lisp_Object Vblink_cursor_alist;
/* A scratch glyph row with contents used for generating truncation
glyphs. Also used in direct_output_for_insert. */
#define MAX_SCRATCH_GLYPHS 100
struct glyph_row scratch_glyph_row;
static struct glyph scratch_glyphs[MAX_SCRATCH_GLYPHS];
/* Ascent and height of the last line processed by move_it_to. */
static int last_max_ascent, last_height;
/* Non-zero if there's a help-echo in the echo area. */
int help_echo_showing_p;
/* If >= 0, computed, exact values of mode-line and header-line height
to use in the macros CURRENT_MODE_LINE_HEIGHT and
CURRENT_HEADER_LINE_HEIGHT. */
int current_mode_line_height, current_header_line_height;
/* The maximum distance to look ahead for text properties. Values
that are too small let us call compute_char_face and similar
functions too often which is expensive. Values that are too large
let us call compute_char_face and alike too often because we
might not be interested in text properties that far away. */
#define TEXT_PROP_DISTANCE_LIMIT 100
#if GLYPH_DEBUG
/* Variables to turn off display optimizations from Lisp. */
int inhibit_try_window_id, inhibit_try_window_reusing;
int inhibit_try_cursor_movement;
/* Non-zero means print traces of redisplay if compiled with
GLYPH_DEBUG != 0. */
int trace_redisplay_p;
#endif /* GLYPH_DEBUG */
#ifdef DEBUG_TRACE_MOVE
/* Non-zero means trace with TRACE_MOVE to stderr. */
int trace_move;
#define TRACE_MOVE(x) if (trace_move) fprintf x; else (void) 0
#else
#define TRACE_MOVE(x) (void) 0
#endif
/* Non-zero means automatically scroll windows horizontally to make
point visible. */
int automatic_hscrolling_p;
Lisp_Object Qauto_hscroll_mode;
/* How close to the margin can point get before the window is scrolled
horizontally. */
EMACS_INT hscroll_margin;
/* How much to scroll horizontally when point is inside the above margin. */
Lisp_Object Vhscroll_step;
/* The variable `resize-mini-windows'. If nil, don't resize
mini-windows. If t, always resize them to fit the text they
display. If `grow-only', let mini-windows grow only until they
become empty. */
Lisp_Object Vresize_mini_windows;
/* Buffer being redisplayed -- for redisplay_window_error. */
struct buffer *displayed_buffer;
/* Space between overline and text. */
EMACS_INT overline_margin;
/* Require underline to be at least this many screen pixels below baseline
This to avoid underline "merging" with the base of letters at small
font sizes, particularly when x_use_underline_position_properties is on. */
EMACS_INT underline_minimum_offset;
/* Value returned from text property handlers (see below). */
enum prop_handled
{
HANDLED_NORMALLY,
HANDLED_RECOMPUTE_PROPS,
HANDLED_OVERLAY_STRING_CONSUMED,
HANDLED_RETURN
};
/* A description of text properties that redisplay is interested
in. */
struct props
{
/* The name of the property. */
Lisp_Object *name;
/* A unique index for the property. */
enum prop_idx idx;
/* A handler function called to set up iterator IT from the property
at IT's current position. Value is used to steer handle_stop. */
enum prop_handled (*handler) P_ ((struct it *it));
};
static enum prop_handled handle_face_prop P_ ((struct it *));
static enum prop_handled handle_invisible_prop P_ ((struct it *));
static enum prop_handled handle_display_prop P_ ((struct it *));
static enum prop_handled handle_composition_prop P_ ((struct it *));
static enum prop_handled handle_overlay_change P_ ((struct it *));
static enum prop_handled handle_fontified_prop P_ ((struct it *));
/* Properties handled by iterators. */
static struct props it_props[] =
{
{&Qfontified, FONTIFIED_PROP_IDX, handle_fontified_prop},
/* Handle `face' before `display' because some sub-properties of
`display' need to know the face. */
{&Qface, FACE_PROP_IDX, handle_face_prop},
{&Qdisplay, DISPLAY_PROP_IDX, handle_display_prop},
{&Qinvisible, INVISIBLE_PROP_IDX, handle_invisible_prop},
{&Qcomposition, COMPOSITION_PROP_IDX, handle_composition_prop},
{NULL, 0, NULL}
};
/* Value is the position described by X. If X is a marker, value is
the marker_position of X. Otherwise, value is X. */
#define COERCE_MARKER(X) (MARKERP ((X)) ? Fmarker_position (X) : (X))
/* Enumeration returned by some move_it_.* functions internally. */
enum move_it_result
{
/* Not used. Undefined value. */
MOVE_UNDEFINED,
/* Move ended at the requested buffer position or ZV. */
MOVE_POS_MATCH_OR_ZV,
/* Move ended at the requested X pixel position. */
MOVE_X_REACHED,
/* Move within a line ended at the end of a line that must be
continued. */
MOVE_LINE_CONTINUED,
/* Move within a line ended at the end of a line that would
be displayed truncated. */
MOVE_LINE_TRUNCATED,
/* Move within a line ended at a line end. */
MOVE_NEWLINE_OR_CR
};
/* This counter is used to clear the face cache every once in a while
in redisplay_internal. It is incremented for each redisplay.
Every CLEAR_FACE_CACHE_COUNT full redisplays, the face cache is
cleared. */
#define CLEAR_FACE_CACHE_COUNT 500
static int clear_face_cache_count;
/* Similarly for the image cache. */
#ifdef HAVE_WINDOW_SYSTEM
#define CLEAR_IMAGE_CACHE_COUNT 101
static int clear_image_cache_count;
#endif
/* Non-zero while redisplay_internal is in progress. */
int redisplaying_p;
/* Non-zero means don't free realized faces. Bound while freeing
realized faces is dangerous because glyph matrices might still
reference them. */
int inhibit_free_realized_faces;
Lisp_Object Qinhibit_free_realized_faces;
/* If a string, XTread_socket generates an event to display that string.
(The display is done in read_char.) */
Lisp_Object help_echo_string;
Lisp_Object help_echo_window;
Lisp_Object help_echo_object;
int help_echo_pos;
/* Temporary variable for XTread_socket. */
Lisp_Object previous_help_echo_string;
/* Null glyph slice */
static struct glyph_slice null_glyph_slice = { 0, 0, 0, 0 };
/* Platform-independent portion of hourglass implementation. */
/* Non-zero means we're allowed to display a hourglass pointer. */
int display_hourglass_p;
/* Non-zero means an hourglass cursor is currently shown. */
int hourglass_shown_p;
/* If non-null, an asynchronous timer that, when it expires, displays
an hourglass cursor on all frames. */
struct atimer *hourglass_atimer;
/* Number of seconds to wait before displaying an hourglass cursor. */
Lisp_Object Vhourglass_delay;
/* Default number of seconds to wait before displaying an hourglass
cursor. */
#define DEFAULT_HOURGLASS_DELAY 1
/* Function prototypes. */
static void setup_for_ellipsis P_ ((struct it *, int));
static void mark_window_display_accurate_1 P_ ((struct window *, int));
static int single_display_spec_string_p P_ ((Lisp_Object, Lisp_Object));
static int display_prop_string_p P_ ((Lisp_Object, Lisp_Object));
static int cursor_row_p P_ ((struct window *, struct glyph_row *));
static int redisplay_mode_lines P_ ((Lisp_Object, int));
static char *decode_mode_spec_coding P_ ((Lisp_Object, char *, int));
static Lisp_Object get_it_property P_ ((struct it *it, Lisp_Object prop));
static void handle_line_prefix P_ ((struct it *));
static void pint2str P_ ((char *, int, int));
static void pint2hrstr P_ ((char *, int, int));
static struct text_pos run_window_scroll_functions P_ ((Lisp_Object,
struct text_pos));
static void reconsider_clip_changes P_ ((struct window *, struct buffer *));
static int text_outside_line_unchanged_p P_ ((struct window *, int, int));
static void store_mode_line_noprop_char P_ ((char));
static int store_mode_line_noprop P_ ((const unsigned char *, int, int));
static void x_consider_frame_title P_ ((Lisp_Object));
static void handle_stop P_ ((struct it *));
static int tool_bar_lines_needed P_ ((struct frame *, int *));
static int single_display_spec_intangible_p P_ ((Lisp_Object));
static void ensure_echo_area_buffers P_ ((void));
static Lisp_Object unwind_with_echo_area_buffer P_ ((Lisp_Object));
static Lisp_Object with_echo_area_buffer_unwind_data P_ ((struct window *));
static int with_echo_area_buffer P_ ((struct window *, int,
int (*) (EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT),
EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
static void clear_garbaged_frames P_ ((void));
static int current_message_1 P_ ((EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
static int truncate_message_1 P_ ((EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
static int set_message_1 P_ ((EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
static int display_echo_area P_ ((struct window *));
static int display_echo_area_1 P_ ((EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
static int resize_mini_window_1 P_ ((EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
static Lisp_Object unwind_redisplay P_ ((Lisp_Object));
static int string_char_and_length P_ ((const unsigned char *, int *));
static struct text_pos display_prop_end P_ ((struct it *, Lisp_Object,
struct text_pos));
static int compute_window_start_on_continuation_line P_ ((struct window *));
static Lisp_Object safe_eval_handler P_ ((Lisp_Object));
static void insert_left_trunc_glyphs P_ ((struct it *));
static struct glyph_row *get_overlay_arrow_glyph_row P_ ((struct window *,
Lisp_Object));
static void extend_face_to_end_of_line P_ ((struct it *));
static int append_space_for_newline P_ ((struct it *, int));
static int cursor_row_fully_visible_p P_ ((struct window *, int, int));
static int try_scrolling P_ ((Lisp_Object, int, EMACS_INT, EMACS_INT, int, int));
static int try_cursor_movement P_ ((Lisp_Object, struct text_pos, int *));
static int trailing_whitespace_p P_ ((int));
static int message_log_check_duplicate P_ ((int, int, int, int));
static void push_it P_ ((struct it *));
static void pop_it P_ ((struct it *));
static void sync_frame_with_window_matrix_rows P_ ((struct window *));
static void select_frame_for_redisplay P_ ((Lisp_Object));
static void redisplay_internal P_ ((int));
static int echo_area_display P_ ((int));
static void redisplay_windows P_ ((Lisp_Object));
static void redisplay_window P_ ((Lisp_Object, int));
static Lisp_Object redisplay_window_error ();
static Lisp_Object redisplay_window_0 P_ ((Lisp_Object));
static Lisp_Object redisplay_window_1 P_ ((Lisp_Object));
static int update_menu_bar P_ ((struct frame *, int, int));
static int try_window_reusing_current_matrix P_ ((struct window *));
static int try_window_id P_ ((struct window *));
static int display_line P_ ((struct it *));
static int display_mode_lines P_ ((struct window *));
static int display_mode_line P_ ((struct window *, enum face_id, Lisp_Object));
static int display_mode_element P_ ((struct it *, int, int, int, Lisp_Object, Lisp_Object, int));
static int store_mode_line_string P_ ((char *, Lisp_Object, int, int, int, Lisp_Object));
static char *decode_mode_spec P_ ((struct window *, int, int, int,
Lisp_Object *));
static void display_menu_bar P_ ((struct window *));
static int display_count_lines P_ ((int, int, int, int, int *));
static int display_string P_ ((unsigned char *, Lisp_Object, Lisp_Object,
EMACS_INT, EMACS_INT, struct it *, int, int, int, int));
static void compute_line_metrics P_ ((struct it *));
static void run_redisplay_end_trigger_hook P_ ((struct it *));
static int get_overlay_strings P_ ((struct it *, int));
static int get_overlay_strings_1 P_ ((struct it *, int, int));
static void next_overlay_string P_ ((struct it *));
static void reseat P_ ((struct it *, struct text_pos, int));
static void reseat_1 P_ ((struct it *, struct text_pos, int));
static void back_to_previous_visible_line_start P_ ((struct it *));
void reseat_at_previous_visible_line_start P_ ((struct it *));
static void reseat_at_next_visible_line_start P_ ((struct it *, int));
static int next_element_from_ellipsis P_ ((struct it *));
static int next_element_from_display_vector P_ ((struct it *));
static int next_element_from_string P_ ((struct it *));
static int next_element_from_c_string P_ ((struct it *));
static int next_element_from_buffer P_ ((struct it *));
static int next_element_from_composition P_ ((struct it *));
static int next_element_from_image P_ ((struct it *));
static int next_element_from_stretch P_ ((struct it *));
static void load_overlay_strings P_ ((struct it *, int));
static int init_from_display_pos P_ ((struct it *, struct window *,
struct display_pos *));
static void reseat_to_string P_ ((struct it *, unsigned char *,
Lisp_Object, int, int, int, int));
static enum move_it_result
move_it_in_display_line_to (struct it *, EMACS_INT, int,
enum move_operation_enum);
void move_it_vertically_backward P_ ((struct it *, int));
static void init_to_row_start P_ ((struct it *, struct window *,
struct glyph_row *));
static int init_to_row_end P_ ((struct it *, struct window *,
struct glyph_row *));
static void back_to_previous_line_start P_ ((struct it *));
static int forward_to_next_line_start P_ ((struct it *, int *));
static struct text_pos string_pos_nchars_ahead P_ ((struct text_pos,
Lisp_Object, int));
static struct text_pos string_pos P_ ((int, Lisp_Object));
static struct text_pos c_string_pos P_ ((int, unsigned char *, int));
static int number_of_chars P_ ((unsigned char *, int));
static void compute_stop_pos P_ ((struct it *));
static void compute_string_pos P_ ((struct text_pos *, struct text_pos,
Lisp_Object));
static int face_before_or_after_it_pos P_ ((struct it *, int));
static EMACS_INT next_overlay_change P_ ((EMACS_INT));
static int handle_single_display_spec P_ ((struct it *, Lisp_Object,
Lisp_Object, Lisp_Object,
struct text_pos *, int));
static int underlying_face_id P_ ((struct it *));
static int in_ellipses_for_invisible_text_p P_ ((struct display_pos *,
struct window *));
#define face_before_it_pos(IT) face_before_or_after_it_pos ((IT), 1)
#define face_after_it_pos(IT) face_before_or_after_it_pos ((IT), 0)
#ifdef HAVE_WINDOW_SYSTEM
static void update_tool_bar P_ ((struct frame *, int));
static void build_desired_tool_bar_string P_ ((struct frame *f));
static int redisplay_tool_bar P_ ((struct frame *));
static void display_tool_bar_line P_ ((struct it *, int));
static void notice_overwritten_cursor P_ ((struct window *,
enum glyph_row_area,
int, int, int, int));
#endif /* HAVE_WINDOW_SYSTEM */
/***********************************************************************
Window display dimensions
***********************************************************************/
/* Return the bottom boundary y-position for text lines in window W.
This is the first y position at which a line cannot start.
It is relative to the top of the window.
This is the height of W minus the height of a mode line, if any. */
INLINE int
window_text_bottom_y (w)
struct window *w;
{
int height = WINDOW_TOTAL_HEIGHT (w);
if (WINDOW_WANTS_MODELINE_P (w))
height -= CURRENT_MODE_LINE_HEIGHT (w);
return height;
}
/* Return the pixel width of display area AREA of window W. AREA < 0
means return the total width of W, not including fringes to
the left and right of the window. */
INLINE int
window_box_width (w, area)
struct window *w;
int area;
{
int cols = XFASTINT (w->total_cols);
int pixels = 0;
if (!w->pseudo_window_p)
{
cols -= WINDOW_SCROLL_BAR_COLS (w);
if (area == TEXT_AREA)
{
if (INTEGERP (w->left_margin_cols))
cols -= XFASTINT (w->left_margin_cols);
if (INTEGERP (w->right_margin_cols))
cols -= XFASTINT (w->right_margin_cols);
pixels = -WINDOW_TOTAL_FRINGE_WIDTH (w);
}
else if (area == LEFT_MARGIN_AREA)
{
cols = (INTEGERP (w->left_margin_cols)
? XFASTINT (w->left_margin_cols) : 0);
pixels = 0;
}
else if (area == RIGHT_MARGIN_AREA)
{
cols = (INTEGERP (w->right_margin_cols)
? XFASTINT (w->right_margin_cols) : 0);
pixels = 0;
}
}
return cols * WINDOW_FRAME_COLUMN_WIDTH (w) + pixels;
}
/* Return the pixel height of the display area of window W, not
including mode lines of W, if any. */
INLINE int
window_box_height (w)
struct window *w;
{
struct frame *f = XFRAME (w->frame);
int height = WINDOW_TOTAL_HEIGHT (w);
xassert (height >= 0);
/* Note: the code below that determines the mode-line/header-line
height is essentially the same as that contained in the macro
CURRENT_{MODE,HEADER}_LINE_HEIGHT, except that it checks whether
the appropriate glyph row has its `mode_line_p' flag set,
and if it doesn't, uses estimate_mode_line_height instead. */
if (WINDOW_WANTS_MODELINE_P (w))
{
struct glyph_row *ml_row
= (w->current_matrix && w->current_matrix->rows
? MATRIX_MODE_LINE_ROW (w->current_matrix)
: 0);
if (ml_row && ml_row->mode_line_p)
height -= ml_row->height;
else
height -= estimate_mode_line_height (f, CURRENT_MODE_LINE_FACE_ID (w));
}
if (WINDOW_WANTS_HEADER_LINE_P (w))
{
struct glyph_row *hl_row
= (w->current_matrix && w->current_matrix->rows
? MATRIX_HEADER_LINE_ROW (w->current_matrix)
: 0);
if (hl_row && hl_row->mode_line_p)
height -= hl_row->height;
else
height -= estimate_mode_line_height (f, HEADER_LINE_FACE_ID);
}
/* With a very small font and a mode-line that's taller than
default, we might end up with a negative height. */
return max (0, height);
}
/* Return the window-relative coordinate of the left edge of display
area AREA of window W. AREA < 0 means return the left edge of the
whole window, to the right of the left fringe of W. */
INLINE int
window_box_left_offset (w, area)
struct window *w;
int area;
{
int x;
if (w->pseudo_window_p)
return 0;
x = WINDOW_LEFT_SCROLL_BAR_AREA_WIDTH (w);
if (area == TEXT_AREA)
x += (WINDOW_LEFT_FRINGE_WIDTH (w)
+ window_box_width (w, LEFT_MARGIN_AREA));
else if (area == RIGHT_MARGIN_AREA)
x += (WINDOW_LEFT_FRINGE_WIDTH (w)
+ window_box_width (w, LEFT_MARGIN_AREA)
+ window_box_width (w, TEXT_AREA)
+ (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
? 0
: WINDOW_RIGHT_FRINGE_WIDTH (w)));
else if (area == LEFT_MARGIN_AREA
&& WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w))
x += WINDOW_LEFT_FRINGE_WIDTH (w);
return x;
}
/* Return the window-relative coordinate of the right edge of display
area AREA of window W. AREA < 0 means return the left edge of the
whole window, to the left of the right fringe of W. */
INLINE int
window_box_right_offset (w, area)
struct window *w;
int area;
{
return window_box_left_offset (w, area) + window_box_width (w, area);
}
/* Return the frame-relative coordinate of the left edge of display
area AREA of window W. AREA < 0 means return the left edge of the
whole window, to the right of the left fringe of W. */
INLINE int
window_box_left (w, area)
struct window *w;
int area;
{
struct frame *f = XFRAME (w->frame);
int x;
if (w->pseudo_window_p)
return FRAME_INTERNAL_BORDER_WIDTH (f);
x = (WINDOW_LEFT_EDGE_X (w)
+ window_box_left_offset (w, area));
return x;
}
/* Return the frame-relative coordinate of the right edge of display
area AREA of window W. AREA < 0 means return the left edge of the
whole window, to the left of the right fringe of W. */
INLINE int
window_box_right (w, area)
struct window *w;
int area;
{
return window_box_left (w, area) + window_box_width (w, area);
}
/* Get the bounding box of the display area AREA of window W, without
mode lines, in frame-relative coordinates. AREA < 0 means the
whole window, not including the left and right fringes of
the window. Return in *BOX_X and *BOX_Y the frame-relative pixel
coordinates of the upper-left corner of the box. Return in
*BOX_WIDTH, and *BOX_HEIGHT the pixel width and height of the box. */
INLINE void
window_box (w, area, box_x, box_y, box_width, box_height)
struct window *w;
int area;
int *box_x, *box_y, *box_width, *box_height;
{
if (box_width)
*box_width = window_box_width (w, area);
if (box_height)
*box_height = window_box_height (w);
if (box_x)
*box_x = window_box_left (w, area);
if (box_y)
{
*box_y = WINDOW_TOP_EDGE_Y (w);
if (WINDOW_WANTS_HEADER_LINE_P (w))
*box_y += CURRENT_HEADER_LINE_HEIGHT (w);
}
}
/* Get the bounding box of the display area AREA of window W, without
mode lines. AREA < 0 means the whole window, not including the
left and right fringe of the window. Return in *TOP_LEFT_X
and TOP_LEFT_Y the frame-relative pixel coordinates of the
upper-left corner of the box. Return in *BOTTOM_RIGHT_X, and
*BOTTOM_RIGHT_Y the coordinates of the bottom-right corner of the
box. */
INLINE void
window_box_edges (w, area, top_left_x, top_left_y,
bottom_right_x, bottom_right_y)
struct window *w;
int area;
int *top_left_x, *top_left_y, *bottom_right_x, *bottom_right_y;
{
window_box (w, area, top_left_x, top_left_y, bottom_right_x,
bottom_right_y);
*bottom_right_x += *top_left_x;
*bottom_right_y += *top_left_y;
}
/***********************************************************************
Utilities
***********************************************************************/
/* Return the bottom y-position of the line the iterator IT is in.
This can modify IT's settings. */
int
line_bottom_y (it)
struct it *it;
{
int line_height = it->max_ascent + it->max_descent;
int line_top_y = it->current_y;
if (line_height == 0)
{
if (last_height)
line_height = last_height;
else if (IT_CHARPOS (*it) < ZV)
{
move_it_by_lines (it, 1, 1);
line_height = (it->max_ascent || it->max_descent
? it->max_ascent + it->max_descent
: last_height);
}
else
{
struct glyph_row *row = it->glyph_row;
/* Use the default character height. */
it->glyph_row = NULL;
it->what = IT_CHARACTER;
it->c = ' ';
it->len = 1;
PRODUCE_GLYPHS (it);
line_height = it->ascent + it->descent;
it->glyph_row = row;
}
}
return line_top_y + line_height;
}
/* Return 1 if position CHARPOS is visible in window W.
CHARPOS < 0 means return info about WINDOW_END position.
If visible, set *X and *Y to pixel coordinates of top left corner.
Set *RTOP and *RBOT to pixel height of an invisible area of glyph at POS.
Set *ROWH and *VPOS to row's visible height and VPOS (row number). */
int
pos_visible_p (w, charpos, x, y, rtop, rbot, rowh, vpos)
struct window *w;
int charpos, *x, *y, *rtop, *rbot, *rowh, *vpos;
{
struct it it;
struct text_pos top;
int visible_p = 0;
struct buffer *old_buffer = NULL;
if (FRAME_INITIAL_P (XFRAME (WINDOW_FRAME (w))))
return visible_p;
if (XBUFFER (w->buffer) != current_buffer)
{
old_buffer = current_buffer;
set_buffer_internal_1 (XBUFFER (w->buffer));
}
SET_TEXT_POS_FROM_MARKER (top, w->start);
/* Compute exact mode line heights. */
if (WINDOW_WANTS_MODELINE_P (w))
current_mode_line_height
= display_mode_line (w, CURRENT_MODE_LINE_FACE_ID (w),
current_buffer->mode_line_format);
if (WINDOW_WANTS_HEADER_LINE_P (w))
current_header_line_height
= display_mode_line (w, HEADER_LINE_FACE_ID,
current_buffer->header_line_format);
start_display (&it, w, top);
move_it_to (&it, charpos, -1, it.last_visible_y-1, -1,
(charpos >= 0 ? MOVE_TO_POS : 0) | MOVE_TO_Y);
if (charpos >= 0 && IT_CHARPOS (it) >= charpos)
{
/* We have reached CHARPOS, or passed it. How the call to
move_it_to can overshoot: (i) If CHARPOS is on invisible
text, move_it_to stops at the end of the invisible text,
after CHARPOS. (ii) If CHARPOS is in a display vector,
move_it_to stops on its last glyph. */
int top_x = it.current_x;
int top_y = it.current_y;
enum it_method it_method = it.method;
/* Calling line_bottom_y may change it.method, it.position, etc. */
int bottom_y = (last_height = 0, line_bottom_y (&it));
int window_top_y = WINDOW_HEADER_LINE_HEIGHT (w);
if (top_y < window_top_y)
visible_p = bottom_y > window_top_y;
else if (top_y < it.last_visible_y)
visible_p = 1;
if (visible_p)
{
if (it_method == GET_FROM_DISPLAY_VECTOR)
{
/* We stopped on the last glyph of a display vector.
Try and recompute. Hack alert! */
if (charpos < 2 || top.charpos >= charpos)
top_x = it.glyph_row->x;
else
{
struct it it2;
start_display (&it2, w, top);
move_it_to (&it2, charpos - 1, -1, -1, -1, MOVE_TO_POS);
get_next_display_element (&it2);
PRODUCE_GLYPHS (&it2);
if (ITERATOR_AT_END_OF_LINE_P (&it2)
|| it2.current_x > it2.last_visible_x)
top_x = it.glyph_row->x;
else
{
top_x = it2.current_x;
top_y = it2.current_y;
}
}
}
*x = top_x;
*y = max (top_y + max (0, it.max_ascent - it.ascent), window_top_y);
*rtop = max (0, window_top_y - top_y);
*rbot = max (0, bottom_y - it.last_visible_y);
*rowh = max (0, (min (bottom_y, it.last_visible_y)
- max (top_y, window_top_y)));
*vpos = it.vpos;
}
}
else
{
struct it it2;
it2 = it;
if (IT_CHARPOS (it) < ZV && FETCH_BYTE (IT_BYTEPOS (it)) != '\n')
move_it_by_lines (&it, 1, 0);
if (charpos < IT_CHARPOS (it)
|| (it.what == IT_EOB && charpos == IT_CHARPOS (it)))
{
visible_p = 1;
move_it_to (&it2, charpos, -1, -1, -1, MOVE_TO_POS);
*x = it2.current_x;
*y = it2.current_y + it2.max_ascent - it2.ascent;
*rtop = max (0, -it2.current_y);
*rbot = max (0, ((it2.current_y + it2.max_ascent + it2.max_descent)
- it.last_visible_y));
*rowh = max (0, (min (it2.current_y + it2.max_ascent + it2.max_descent,
it.last_visible_y)
- max (it2.current_y,
WINDOW_HEADER_LINE_HEIGHT (w))));
*vpos = it2.vpos;
}
}
if (old_buffer)
set_buffer_internal_1 (old_buffer);
current_header_line_height = current_mode_line_height = -1;
if (visible_p && XFASTINT (w->hscroll) > 0)
*x -= XFASTINT (w->hscroll) * WINDOW_FRAME_COLUMN_WIDTH (w);
#if 0
/* Debugging code. */
if (visible_p)
fprintf (stderr, "+pv pt=%d vs=%d --> x=%d y=%d rt=%d rb=%d rh=%d vp=%d\n",
charpos, w->vscroll, *x, *y, *rtop, *rbot, *rowh, *vpos);
else
fprintf (stderr, "-pv pt=%d vs=%d\n", charpos, w->vscroll);
#endif
return visible_p;
}
/* Return the next character from STR which is MAXLEN bytes long.
Return in *LEN the length of the character. This is like
STRING_CHAR_AND_LENGTH but never returns an invalid character. If
we find one, we return a `?', but with the length of the invalid
character. */
static INLINE int
string_char_and_length (str, len)
const unsigned char *str;
int *len;
{
int c;
c = STRING_CHAR_AND_LENGTH (str, *len);
if (!CHAR_VALID_P (c, 1))
/* We may not change the length here because other places in Emacs
don't use this function, i.e. they silently accept invalid
characters. */
c = '?';
return c;
}
/* Given a position POS containing a valid character and byte position
in STRING, return the position NCHARS ahead (NCHARS >= 0). */
static struct text_pos
string_pos_nchars_ahead (pos, string, nchars)
struct text_pos pos;
Lisp_Object string;
int nchars;
{
xassert (STRINGP (string) && nchars >= 0);
if (STRING_MULTIBYTE (string))
{
int rest = SBYTES (string) - BYTEPOS (pos);
const unsigned char *p = SDATA (string) + BYTEPOS (pos);
int len;
while (nchars--)
{
string_char_and_length (p, &len);
p += len, rest -= len;
xassert (rest >= 0);
CHARPOS (pos) += 1;
BYTEPOS (pos) += len;
}
}
else
SET_TEXT_POS (pos, CHARPOS (pos) + nchars, BYTEPOS (pos) + nchars);
return pos;
}
/* Value is the text position, i.e. character and byte position,
for character position CHARPOS in STRING. */
static INLINE struct text_pos
string_pos (charpos, string)
int charpos;
Lisp_Object string;
{
struct text_pos pos;
xassert (STRINGP (string));
xassert (charpos >= 0);
SET_TEXT_POS (pos, charpos, string_char_to_byte (string, charpos));
return pos;
}
/* Value is a text position, i.e. character and byte position, for
character position CHARPOS in C string S. MULTIBYTE_P non-zero
means recognize multibyte characters. */
static struct text_pos
c_string_pos (charpos, s, multibyte_p)
int charpos;
unsigned char *s;
int multibyte_p;
{
struct text_pos pos;
xassert (s != NULL);
xassert (charpos >= 0);
if (multibyte_p)
{
int rest = strlen (s), len;
SET_TEXT_POS (pos, 0, 0);
while (charpos--)
{
string_char_and_length (s, &len);
s += len, rest -= len;
xassert (rest >= 0);
CHARPOS (pos) += 1;
BYTEPOS (pos) += len;
}
}
else
SET_TEXT_POS (pos, charpos, charpos);
return pos;
}
/* Value is the number of characters in C string S. MULTIBYTE_P
non-zero means recognize multibyte characters. */
static int
number_of_chars (s, multibyte_p)
unsigned char *s;
int multibyte_p;
{
int nchars;
if (multibyte_p)
{
int rest = strlen (s), len;
unsigned char *p = (unsigned char *) s;
for (nchars = 0; rest > 0; ++nchars)
{
string_char_and_length (p, &len);
rest -= len, p += len;
}
}
else
nchars = strlen (s);
return nchars;
}
/* Compute byte position NEWPOS->bytepos corresponding to
NEWPOS->charpos. POS is a known position in string STRING.
NEWPOS->charpos must be >= POS.charpos. */
static void
compute_string_pos (newpos, pos, string)
struct text_pos *newpos, pos;
Lisp_Object string;
{
xassert (STRINGP (string));
xassert (CHARPOS (*newpos) >= CHARPOS (pos));
if (STRING_MULTIBYTE (string))
*newpos = string_pos_nchars_ahead (pos, string,
CHARPOS (*newpos) - CHARPOS (pos));
else
BYTEPOS (*newpos) = CHARPOS (*newpos);
}
/* EXPORT:
Return an estimation of the pixel height of mode or header lines on
frame F. FACE_ID specifies what line's height to estimate. */
int
estimate_mode_line_height (f, face_id)
struct frame *f;
enum face_id face_id;
{
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (f))
{
int height = FONT_HEIGHT (FRAME_FONT (f));
/* This function is called so early when Emacs starts that the face
cache and mode line face are not yet initialized. */
if (FRAME_FACE_CACHE (f))
{
struct face *face = FACE_FROM_ID (f, face_id);
if (face)
{
if (face->font)
height = FONT_HEIGHT (face->font);
if (face->box_line_width > 0)
height += 2 * face->box_line_width;
}
}
return height;
}
#endif
return 1;
}
/* Given a pixel position (PIX_X, PIX_Y) on frame F, return glyph
co-ordinates in (*X, *Y). Set *BOUNDS to the rectangle that the
glyph at X, Y occupies, if BOUNDS != 0. If NOCLIP is non-zero, do
not force the value into range. */
void
pixel_to_glyph_coords (f, pix_x, pix_y, x, y, bounds, noclip)
FRAME_PTR f;
register int pix_x, pix_y;
int *x, *y;
NativeRectangle *bounds;
int noclip;
{
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (f))
{
/* Arrange for the division in FRAME_PIXEL_X_TO_COL etc. to round down
even for negative values. */
if (pix_x < 0)
pix_x -= FRAME_COLUMN_WIDTH (f) - 1;
if (pix_y < 0)
pix_y -= FRAME_LINE_HEIGHT (f) - 1;
pix_x = FRAME_PIXEL_X_TO_COL (f, pix_x);
pix_y = FRAME_PIXEL_Y_TO_LINE (f, pix_y);
if (bounds)
STORE_NATIVE_RECT (*bounds,
FRAME_COL_TO_PIXEL_X (f, pix_x),
FRAME_LINE_TO_PIXEL_Y (f, pix_y),
FRAME_COLUMN_WIDTH (f) - 1,
FRAME_LINE_HEIGHT (f) - 1);
if (!noclip)
{
if (pix_x < 0)
pix_x = 0;
else if (pix_x > FRAME_TOTAL_COLS (f))
pix_x = FRAME_TOTAL_COLS (f);
if (pix_y < 0)
pix_y = 0;
else if (pix_y > FRAME_LINES (f))
pix_y = FRAME_LINES (f);
}
}
#endif
*x = pix_x;
*y = pix_y;
}
/* Given HPOS/VPOS in the current matrix of W, return corresponding
frame-relative pixel positions in *FRAME_X and *FRAME_Y. If we
can't tell the positions because W's display is not up to date,
return 0. */
int
glyph_to_pixel_coords (w, hpos, vpos, frame_x, frame_y)
struct window *w;
int hpos, vpos;
int *frame_x, *frame_y;
{
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (XFRAME (WINDOW_FRAME (w))))
{
int success_p;
xassert (hpos >= 0 && hpos < w->current_matrix->matrix_w);
xassert (vpos >= 0 && vpos < w->current_matrix->matrix_h);
if (display_completed)
{
struct glyph_row *row = MATRIX_ROW (w->current_matrix, vpos);
struct glyph *glyph = row->glyphs[TEXT_AREA];
struct glyph *end = glyph + min (hpos, row->used[TEXT_AREA]);
hpos = row->x;
vpos = row->y;
while (glyph < end)
{
hpos += glyph->pixel_width;
++glyph;
}
/* If first glyph is partially visible, its first visible position is still 0. */
if (hpos < 0)
hpos = 0;
success_p = 1;
}
else
{
hpos = vpos = 0;
success_p = 0;
}
*frame_x = WINDOW_TO_FRAME_PIXEL_X (w, hpos);
*frame_y = WINDOW_TO_FRAME_PIXEL_Y (w, vpos);
return success_p;
}
#endif
*frame_x = hpos;
*frame_y = vpos;
return 1;
}
#ifdef HAVE_WINDOW_SYSTEM
/* Find the glyph under window-relative coordinates X/Y in window W.
Consider only glyphs from buffer text, i.e. no glyphs from overlay
strings. Return in *HPOS and *VPOS the row and column number of
the glyph found. Return in *AREA the glyph area containing X.
Value is a pointer to the glyph found or null if X/Y is not on
text, or we can't tell because W's current matrix is not up to
date. */
static
struct glyph *
x_y_to_hpos_vpos (w, x, y, hpos, vpos, dx, dy, area)
struct window *w;
int x, y;
int *hpos, *vpos, *dx, *dy, *area;
{
struct glyph *glyph, *end;
struct glyph_row *row = NULL;
int x0, i;
/* Find row containing Y. Give up if some row is not enabled. */
for (i = 0; i < w->current_matrix->nrows; ++i)
{
row = MATRIX_ROW (w->current_matrix, i);
if (!row->enabled_p)
return NULL;
if (y >= row->y && y < MATRIX_ROW_BOTTOM_Y (row))
break;
}
*vpos = i;
*hpos = 0;
/* Give up if Y is not in the window. */
if (i == w->current_matrix->nrows)
return NULL;
/* Get the glyph area containing X. */
if (w->pseudo_window_p)
{
*area = TEXT_AREA;
x0 = 0;
}
else
{
if (x < window_box_left_offset (w, TEXT_AREA))
{
*area = LEFT_MARGIN_AREA;
x0 = window_box_left_offset (w, LEFT_MARGIN_AREA);
}
else if (x < window_box_right_offset (w, TEXT_AREA))
{
*area = TEXT_AREA;
x0 = window_box_left_offset (w, TEXT_AREA) + min (row->x, 0);
}
else
{
*area = RIGHT_MARGIN_AREA;
x0 = window_box_left_offset (w, RIGHT_MARGIN_AREA);
}
}
/* Find glyph containing X. */
glyph = row->glyphs[*area];
end = glyph + row->used[*area];
x -= x0;
while (glyph < end && x >= glyph->pixel_width)
{
x -= glyph->pixel_width;
++glyph;
}
if (glyph == end)
return NULL;
if (dx)
{
*dx = x;
*dy = y - (row->y + row->ascent - glyph->ascent);
}
*hpos = glyph - row->glyphs[*area];
return glyph;
}
/* EXPORT:
Convert frame-relative x/y to coordinates relative to window W.
Takes pseudo-windows into account. */
void
frame_to_window_pixel_xy (w, x, y)
struct window *w;
int *x, *y;
{
if (w->pseudo_window_p)
{
/* A pseudo-window is always full-width, and starts at the
left edge of the frame, plus a frame border. */
struct frame *f = XFRAME (w->frame);
*x -= FRAME_INTERNAL_BORDER_WIDTH (f);
*y = FRAME_TO_WINDOW_PIXEL_Y (w, *y);
}
else
{
*x -= WINDOW_LEFT_EDGE_X (w);
*y = FRAME_TO_WINDOW_PIXEL_Y (w, *y);
}
}
/* EXPORT:
Return in RECTS[] at most N clipping rectangles for glyph string S.
Return the number of stored rectangles. */
int
get_glyph_string_clip_rects (s, rects, n)
struct glyph_string *s;
NativeRectangle *rects;
int n;
{
XRectangle r;
if (n <= 0)
return 0;
if (s->row->full_width_p)
{
/* Draw full-width. X coordinates are relative to S->w->left_col. */
r.x = WINDOW_LEFT_EDGE_X (s->w);
r.width = WINDOW_TOTAL_WIDTH (s->w);
/* Unless displaying a mode or menu bar line, which are always
fully visible, clip to the visible part of the row. */
if (s->w->pseudo_window_p)
r.height = s->row->visible_height;
else
r.height = s->height;
}
else
{
/* This is a text line that may be partially visible. */
r.x = window_box_left (s->w, s->area);
r.width = window_box_width (s->w, s->area);
r.height = s->row->visible_height;
}
if (s->clip_head)
if (r.x < s->clip_head->x)
{
if (r.width >= s->clip_head->x - r.x)
r.width -= s->clip_head->x - r.x;
else
r.width = 0;
r.x = s->clip_head->x;
}
if (s->clip_tail)
if (r.x + r.width > s->clip_tail->x + s->clip_tail->background_width)
{
if (s->clip_tail->x + s->clip_tail->background_width >= r.x)
r.width = s->clip_tail->x + s->clip_tail->background_width - r.x;
else
r.width = 0;
}
/* If S draws overlapping rows, it's sufficient to use the top and
bottom of the window for clipping because this glyph string
intentionally draws over other lines. */
if (s->for_overlaps)
{
r.y = WINDOW_HEADER_LINE_HEIGHT (s->w);
r.height = window_text_bottom_y (s->w) - r.y;
/* Alas, the above simple strategy does not work for the
environments with anti-aliased text: if the same text is
drawn onto the same place multiple times, it gets thicker.
If the overlap we are processing is for the erased cursor, we
take the intersection with the rectagle of the cursor. */
if (s->for_overlaps & OVERLAPS_ERASED_CURSOR)
{
XRectangle rc, r_save = r;
rc.x = WINDOW_TEXT_TO_FRAME_PIXEL_X (s->w, s->w->phys_cursor.x);
rc.y = s->w->phys_cursor.y;
rc.width = s->w->phys_cursor_width;
rc.height = s->w->phys_cursor_height;
x_intersect_rectangles (&r_save, &rc, &r);
}
}
else
{
/* Don't use S->y for clipping because it doesn't take partially
visible lines into account. For example, it can be negative for
partially visible lines at the top of a window. */
if (!s->row->full_width_p
&& MATRIX_ROW_PARTIALLY_VISIBLE_AT_TOP_P (s->w, s->row))
r.y = WINDOW_HEADER_LINE_HEIGHT (s->w);
else
r.y = max (0, s->row->y);
}
r.y = WINDOW_TO_FRAME_PIXEL_Y (s->w, r.y);
/* If drawing the cursor, don't let glyph draw outside its
advertised boundaries. Cleartype does this under some circumstances. */
if (s->hl == DRAW_CURSOR)
{
struct glyph *glyph = s->first_glyph;
int height, max_y;
if (s->x > r.x)
{
r.width -= s->x - r.x;
r.x = s->x;
}
r.width = min (r.width, glyph->pixel_width);
/* If r.y is below window bottom, ensure that we still see a cursor. */
height = min (glyph->ascent + glyph->descent,
min (FRAME_LINE_HEIGHT (s->f), s->row->visible_height));
max_y = window_text_bottom_y (s->w) - height;
max_y = WINDOW_TO_FRAME_PIXEL_Y (s->w, max_y);
if (s->ybase - glyph->ascent > max_y)
{
r.y = max_y;
r.height = height;
}
else
{
/* Don't draw cursor glyph taller than our actual glyph. */
height = max (FRAME_LINE_HEIGHT (s->f), glyph->ascent + glyph->descent);
if (height < r.height)
{
max_y = r.y + r.height;
r.y = min (max_y, max (r.y, s->ybase + glyph->descent - height));
r.height = min (max_y - r.y, height);
}
}
}
if (s->row->clip)
{
XRectangle r_save = r;
if (! x_intersect_rectangles (&r_save, s->row->clip, &r))
r.width = 0;
}
if ((s->for_overlaps & OVERLAPS_BOTH) == 0
|| ((s->for_overlaps & OVERLAPS_BOTH) == OVERLAPS_BOTH && n == 1))
{
#ifdef CONVERT_FROM_XRECT
CONVERT_FROM_XRECT (r, *rects);
#else
*rects = r;
#endif
return 1;
}
else
{
/* If we are processing overlapping and allowed to return
multiple clipping rectangles, we exclude the row of the glyph
string from the clipping rectangle. This is to avoid drawing
the same text on the environment with anti-aliasing. */
#ifdef CONVERT_FROM_XRECT
XRectangle rs[2];
#else
XRectangle *rs = rects;
#endif
int i = 0, row_y = WINDOW_TO_FRAME_PIXEL_Y (s->w, s->row->y);
if (s->for_overlaps & OVERLAPS_PRED)
{
rs[i] = r;
if (r.y + r.height > row_y)
{
if (r.y < row_y)
rs[i].height = row_y - r.y;
else
rs[i].height = 0;
}
i++;
}
if (s->for_overlaps & OVERLAPS_SUCC)
{
rs[i] = r;
if (r.y < row_y + s->row->visible_height)
{
if (r.y + r.height > row_y + s->row->visible_height)
{
rs[i].y = row_y + s->row->visible_height;
rs[i].height = r.y + r.height - rs[i].y;
}
else
rs[i].height = 0;
}
i++;
}
n = i;
#ifdef CONVERT_FROM_XRECT
for (i = 0; i < n; i++)
CONVERT_FROM_XRECT (rs[i], rects[i]);
#endif
return n;
}
}
/* EXPORT:
Return in *NR the clipping rectangle for glyph string S. */
void
get_glyph_string_clip_rect (s, nr)
struct glyph_string *s;
NativeRectangle *nr;
{
get_glyph_string_clip_rects (s, nr, 1);
}
/* EXPORT:
Return the position and height of the phys cursor in window W.
Set w->phys_cursor_width to width of phys cursor.
*/
void
get_phys_cursor_geometry (w, row, glyph, xp, yp, heightp)
struct window *w;
struct glyph_row *row;
struct glyph *glyph;
int *xp, *yp, *heightp;
{
struct frame *f = XFRAME (WINDOW_FRAME (w));
int x, y, wd, h, h0, y0;
/* Compute the width of the rectangle to draw. If on a stretch
glyph, and `x-stretch-block-cursor' is nil, don't draw a
rectangle as wide as the glyph, but use a canonical character
width instead. */
wd = glyph->pixel_width - 1;
#if defined(HAVE_NTGUI) || defined(HAVE_NS)
wd++; /* Why? */
#endif
x = w->phys_cursor.x;
if (x < 0)
{
wd += x;
x = 0;
}
if (glyph->type == STRETCH_GLYPH
&& !x_stretch_cursor_p)
wd = min (FRAME_COLUMN_WIDTH (f), wd);
w->phys_cursor_width = wd;
y = w->phys_cursor.y + row->ascent - glyph->ascent;
/* If y is below window bottom, ensure that we still see a cursor. */
h0 = min (FRAME_LINE_HEIGHT (f), row->visible_height);
h = max (h0, glyph->ascent + glyph->descent);
h0 = min (h0, glyph->ascent + glyph->descent);
y0 = WINDOW_HEADER_LINE_HEIGHT (w);
if (y < y0)
{
h = max (h - (y0 - y) + 1, h0);
y = y0 - 1;
}
else
{
y0 = window_text_bottom_y (w) - h0;
if (y > y0)
{
h += y - y0;
y = y0;
}
}
*xp = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, x);
*yp = WINDOW_TO_FRAME_PIXEL_Y (w, y);
*heightp = h;
}
/*
* Remember which glyph the mouse is over.
*/
void
remember_mouse_glyph (f, gx, gy, rect)
struct frame *f;
int gx, gy;
NativeRectangle *rect;
{
Lisp_Object window;
struct window *w;
struct glyph_row *r, *gr, *end_row;
enum window_part part;
enum glyph_row_area area;
int x, y, width, height;
/* Try to determine frame pixel position and size of the glyph under
frame pixel coordinates X/Y on frame F. */
if (!f->glyphs_initialized_p
|| (window = window_from_coordinates (f, gx, gy, &part, &x, &y, 0),
NILP (window)))
{
width = FRAME_SMALLEST_CHAR_WIDTH (f);
height = FRAME_SMALLEST_FONT_HEIGHT (f);
goto virtual_glyph;
}
w = XWINDOW (window);
width = WINDOW_FRAME_COLUMN_WIDTH (w);
height = WINDOW_FRAME_LINE_HEIGHT (w);
r = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
end_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w);
if (w->pseudo_window_p)
{
area = TEXT_AREA;
part = ON_MODE_LINE; /* Don't adjust margin. */
goto text_glyph;
}
switch (part)
{
case ON_LEFT_MARGIN:
area = LEFT_MARGIN_AREA;
goto text_glyph;
case ON_RIGHT_MARGIN:
area = RIGHT_MARGIN_AREA;
goto text_glyph;
case ON_HEADER_LINE:
case ON_MODE_LINE:
gr = (part == ON_HEADER_LINE
? MATRIX_HEADER_LINE_ROW (w->current_matrix)
: MATRIX_MODE_LINE_ROW (w->current_matrix));
gy = gr->y;
area = TEXT_AREA;
goto text_glyph_row_found;
case ON_TEXT:
area = TEXT_AREA;
text_glyph:
gr = 0; gy = 0;
for (; r <= end_row && r->enabled_p; ++r)
if (r->y + r->height > y)
{
gr = r; gy = r->y;
break;
}
text_glyph_row_found:
if (gr && gy <= y)
{
struct glyph *g = gr->glyphs[area];
struct glyph *end = g + gr->used[area];
height = gr->height;
for (gx = gr->x; g < end; gx += g->pixel_width, ++g)
if (gx + g->pixel_width > x)
break;
if (g < end)
{
if (g->type == IMAGE_GLYPH)
{
/* Don't remember when mouse is over image, as
image may have hot-spots. */
STORE_NATIVE_RECT (*rect, 0, 0, 0, 0);
return;
}
width = g->pixel_width;
}
else
{
/* Use nominal char spacing at end of line. */
x -= gx;
gx += (x / width) * width;
}
if (part != ON_MODE_LINE && part != ON_HEADER_LINE)
gx += window_box_left_offset (w, area);
}
else
{
/* Use nominal line height at end of window. */
gx = (x / width) * width;
y -= gy;
gy += (y / height) * height;
}
break;
case ON_LEFT_FRINGE:
gx = (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
? WINDOW_LEFT_SCROLL_BAR_AREA_WIDTH (w)
: window_box_right_offset (w, LEFT_MARGIN_AREA));
width = WINDOW_LEFT_FRINGE_WIDTH (w);
goto row_glyph;
case ON_RIGHT_FRINGE:
gx = (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
? window_box_right_offset (w, RIGHT_MARGIN_AREA)
: window_box_right_offset (w, TEXT_AREA));
width = WINDOW_RIGHT_FRINGE_WIDTH (w);
goto row_glyph;
case ON_SCROLL_BAR:
gx = (WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_LEFT (w)
? 0
: (window_box_right_offset (w, RIGHT_MARGIN_AREA)
+ (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
? WINDOW_RIGHT_FRINGE_WIDTH (w)
: 0)));
width = WINDOW_SCROLL_BAR_AREA_WIDTH (w);
row_glyph:
gr = 0, gy = 0;
for (; r <= end_row && r->enabled_p; ++r)
if (r->y + r->height > y)
{
gr = r; gy = r->y;
break;
}
if (gr && gy <= y)
height = gr->height;
else
{
/* Use nominal line height at end of window. */
y -= gy;
gy += (y / height) * height;
}
break;
default:
;
virtual_glyph:
/* If there is no glyph under the mouse, then we divide the screen
into a grid of the smallest glyph in the frame, and use that
as our "glyph". */
/* Arrange for the division in FRAME_PIXEL_X_TO_COL etc. to
round down even for negative values. */
if (gx < 0)
gx -= width - 1;
if (gy < 0)
gy -= height - 1;
gx = (gx / width) * width;
gy = (gy / height) * height;
goto store_rect;
}
gx += WINDOW_LEFT_EDGE_X (w);
gy += WINDOW_TOP_EDGE_Y (w);
store_rect:
STORE_NATIVE_RECT (*rect, gx, gy, width, height);
/* Visible feedback for debugging. */
#if 0
#if HAVE_X_WINDOWS
XDrawRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
f->output_data.x->normal_gc,
gx, gy, width, height);
#endif
#endif
}
#endif /* HAVE_WINDOW_SYSTEM */
/***********************************************************************
Lisp form evaluation
***********************************************************************/
/* Error handler for safe_eval and safe_call. */
static Lisp_Object
safe_eval_handler (arg)
Lisp_Object arg;
{
add_to_log ("Error during redisplay: %s", arg, Qnil);
return Qnil;
}
/* Evaluate SEXPR and return the result, or nil if something went
wrong. Prevent redisplay during the evaluation. */
/* Call function ARGS[0] with arguments ARGS[1] to ARGS[NARGS - 1].
Return the result, or nil if something went wrong. Prevent
redisplay during the evaluation. */
Lisp_Object
safe_call (nargs, args)
int nargs;
Lisp_Object *args;
{
Lisp_Object val;
if (inhibit_eval_during_redisplay)
val = Qnil;
else
{
int count = SPECPDL_INDEX ();
struct gcpro gcpro1;
GCPRO1 (args[0]);
gcpro1.nvars = nargs;
specbind (Qinhibit_redisplay, Qt);
/* Use Qt to ensure debugger does not run,
so there is no possibility of wanting to redisplay. */
val = internal_condition_case_2 (Ffuncall, nargs, args, Qt,
safe_eval_handler);
UNGCPRO;
val = unbind_to (count, val);
}
return val;
}
/* Call function FN with one argument ARG.
Return the result, or nil if something went wrong. */
Lisp_Object
safe_call1 (fn, arg)
Lisp_Object fn, arg;
{
Lisp_Object args[2];
args[0] = fn;
args[1] = arg;
return safe_call (2, args);
}
static Lisp_Object Qeval;
Lisp_Object
safe_eval (Lisp_Object sexpr)
{
return safe_call1 (Qeval, sexpr);
}
/* Call function FN with one argument ARG.
Return the result, or nil if something went wrong. */
Lisp_Object
safe_call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2)
{
Lisp_Object args[3];
args[0] = fn;
args[1] = arg1;
args[2] = arg2;
return safe_call (3, args);
}
/***********************************************************************
Debugging
***********************************************************************/
#if 0
/* Define CHECK_IT to perform sanity checks on iterators.
This is for debugging. It is too slow to do unconditionally. */
static void
check_it (it)
struct it *it;
{
if (it->method == GET_FROM_STRING)
{
xassert (STRINGP (it->string));
xassert (IT_STRING_CHARPOS (*it) >= 0);
}
else
{
xassert (IT_STRING_CHARPOS (*it) < 0);
if (it->method == GET_FROM_BUFFER)
{
/* Check that character and byte positions agree. */
xassert (IT_CHARPOS (*it) == BYTE_TO_CHAR (IT_BYTEPOS (*it)));
}
}
if (it->dpvec)
xassert (it->current.dpvec_index >= 0);
else
xassert (it->current.dpvec_index < 0);
}
#define CHECK_IT(IT) check_it ((IT))
#else /* not 0 */
#define CHECK_IT(IT) (void) 0
#endif /* not 0 */
#if GLYPH_DEBUG
/* Check that the window end of window W is what we expect it
to be---the last row in the current matrix displaying text. */
static void
check_window_end (w)
struct window *w;
{
if (!MINI_WINDOW_P (w)
&& !NILP (w->window_end_valid))
{
struct glyph_row *row;
xassert ((row = MATRIX_ROW (w->current_matrix,
XFASTINT (w->window_end_vpos)),
!row->enabled_p
|| MATRIX_ROW_DISPLAYS_TEXT_P (row)
|| MATRIX_ROW_VPOS (row, w->current_matrix) == 0));
}
}
#define CHECK_WINDOW_END(W) check_window_end ((W))
#else /* not GLYPH_DEBUG */
#define CHECK_WINDOW_END(W) (void) 0
#endif /* not GLYPH_DEBUG */
/***********************************************************************
Iterator initialization
***********************************************************************/
/* Initialize IT for displaying current_buffer in window W, starting
at character position CHARPOS. CHARPOS < 0 means that no buffer
position is specified which is useful when the iterator is assigned
a position later. BYTEPOS is the byte position corresponding to
CHARPOS. BYTEPOS < 0 means compute it from CHARPOS.
If ROW is not null, calls to produce_glyphs with IT as parameter
will produce glyphs in that row.
BASE_FACE_ID is the id of a base face to use. It must be one of
DEFAULT_FACE_ID for normal text, MODE_LINE_FACE_ID,
MODE_LINE_INACTIVE_FACE_ID, or HEADER_LINE_FACE_ID for displaying
mode lines, or TOOL_BAR_FACE_ID for displaying the tool-bar.
If ROW is null and BASE_FACE_ID is equal to MODE_LINE_FACE_ID,
MODE_LINE_INACTIVE_FACE_ID, or HEADER_LINE_FACE_ID, the iterator
will be initialized to use the corresponding mode line glyph row of
the desired matrix of W. */
void
init_iterator (it, w, charpos, bytepos, row, base_face_id)
struct it *it;
struct window *w;
int charpos, bytepos;
struct glyph_row *row;
enum face_id base_face_id;
{
int highlight_region_p;
enum face_id remapped_base_face_id = base_face_id;
/* Some precondition checks. */
xassert (w != NULL && it != NULL);
xassert (charpos < 0 || (charpos >= BUF_BEG (current_buffer)
&& charpos <= ZV));
/* If face attributes have been changed since the last redisplay,
free realized faces now because they depend on face definitions
that might have changed. Don't free faces while there might be
desired matrices pending which reference these faces. */
if (face_change_count && !inhibit_free_realized_faces)
{
face_change_count = 0;
free_all_realized_faces (Qnil);
}
/* Perhaps remap BASE_FACE_ID to a user-specified alternative. */
if (! NILP (Vface_remapping_alist))
remapped_base_face_id = lookup_basic_face (XFRAME (w->frame), base_face_id);
/* Use one of the mode line rows of W's desired matrix if
appropriate. */
if (row == NULL)
{
if (base_face_id == MODE_LINE_FACE_ID
|| base_face_id == MODE_LINE_INACTIVE_FACE_ID)
row = MATRIX_MODE_LINE_ROW (w->desired_matrix);
else if (base_face_id == HEADER_LINE_FACE_ID)
row = MATRIX_HEADER_LINE_ROW (w->desired_matrix);
}
/* Clear IT. */
bzero (it, sizeof *it);
it->current.overlay_string_index = -1;
it->current.dpvec_index = -1;
it->base_face_id = remapped_base_face_id;
it->string = Qnil;
IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = -1;
/* The window in which we iterate over current_buffer: */
XSETWINDOW (it->window, w);
it->w = w;
it->f = XFRAME (w->frame);
it->cmp_it.id = -1;
/* Extra space between lines (on window systems only). */
if (base_face_id == DEFAULT_FACE_ID
&& FRAME_WINDOW_P (it->f))
{
if (NATNUMP (current_buffer->extra_line_spacing))
it->extra_line_spacing = XFASTINT (current_buffer->extra_line_spacing);
else if (FLOATP (current_buffer->extra_line_spacing))
it->extra_line_spacing = (XFLOAT_DATA (current_buffer->extra_line_spacing)
* FRAME_LINE_HEIGHT (it->f));
else if (it->f->extra_line_spacing > 0)
it->extra_line_spacing = it->f->extra_line_spacing;
it->max_extra_line_spacing = 0;
}
/* If realized faces have been removed, e.g. because of face
attribute changes of named faces, recompute them. When running
in batch mode, the face cache of the initial frame is null. If
we happen to get called, make a dummy face cache. */
if (FRAME_FACE_CACHE (it->f) == NULL)
init_frame_faces (it->f);
if (FRAME_FACE_CACHE (it->f)->used == 0)
recompute_basic_faces (it->f);
/* Current value of the `slice', `space-width', and 'height' properties. */
it->slice.x = it->slice.y = it->slice.width = it->slice.height = Qnil;
it->space_width = Qnil;
it->font_height = Qnil;
it->override_ascent = -1;
/* Are control characters displayed as `^C'? */
it->ctl_arrow_p = !NILP (current_buffer->ctl_arrow);
/* -1 means everything between a CR and the following line end
is invisible. >0 means lines indented more than this value are
invisible. */
it->selective = (INTEGERP (current_buffer->selective_display)
? XFASTINT (current_buffer->selective_display)
: (!NILP (current_buffer->selective_display)
? -1 : 0));
it->selective_display_ellipsis_p
= !NILP (current_buffer->selective_display_ellipses);
/* Display table to use. */
it->dp = window_display_table (w);
/* Are multibyte characters enabled in current_buffer? */
it->multibyte_p = !NILP (current_buffer->enable_multibyte_characters);
/* Non-zero if we should highlight the region. */
highlight_region_p
= (!NILP (Vtransient_mark_mode)
&& !NILP (current_buffer->mark_active)
&& XMARKER (current_buffer->mark)->buffer != 0);
/* Set IT->region_beg_charpos and IT->region_end_charpos to the
start and end of a visible region in window IT->w. Set both to
-1 to indicate no region. */
if (highlight_region_p
/* Maybe highlight only in selected window. */
&& (/* Either show region everywhere. */
highlight_nonselected_windows
/* Or show region in the selected window. */
|| w == XWINDOW (selected_window)
/* Or show the region if we are in the mini-buffer and W is
the window the mini-buffer refers to. */
|| (MINI_WINDOW_P (XWINDOW (selected_window))
&& WINDOWP (minibuf_selected_window)
&& w == XWINDOW (minibuf_selected_window))))
{
int charpos = marker_position (current_buffer->mark);
it->region_beg_charpos = min (PT, charpos);
it->region_end_charpos = max (PT, charpos);
}
else
it->region_beg_charpos = it->region_end_charpos = -1;
/* Get the position at which the redisplay_end_trigger hook should
be run, if it is to be run at all. */
if (MARKERP (w->redisplay_end_trigger)
&& XMARKER (w->redisplay_end_trigger)->buffer != 0)
it->redisplay_end_trigger_charpos
= marker_position (w->redisplay_end_trigger);
else if (INTEGERP (w->redisplay_end_trigger))
it->redisplay_end_trigger_charpos = XINT (w->redisplay_end_trigger);
/* Correct bogus values of tab_width. */
it->tab_width = XINT (current_buffer->tab_width);
if (it->tab_width <= 0 || it->tab_width > 1000)
it->tab_width = 8;
/* Are lines in the display truncated? */
if (base_face_id != DEFAULT_FACE_ID
|| XINT (it->w->hscroll)
|| (! WINDOW_FULL_WIDTH_P (it->w)
&& ((!NILP (Vtruncate_partial_width_windows)
&& !INTEGERP (Vtruncate_partial_width_windows))
|| (INTEGERP (Vtruncate_partial_width_windows)
&& (WINDOW_TOTAL_COLS (it->w)
< XINT (Vtruncate_partial_width_windows))))))
it->line_wrap = TRUNCATE;
else if (NILP (current_buffer->truncate_lines))
it->line_wrap = NILP (current_buffer->word_wrap)
? WINDOW_WRAP : WORD_WRAP;
else
it->line_wrap = TRUNCATE;
/* Get dimensions of truncation and continuation glyphs. These are
displayed as fringe bitmaps under X, so we don't need them for such
frames. */
if (!FRAME_WINDOW_P (it->f))
{
if (it->line_wrap == TRUNCATE)
{
/* We will need the truncation glyph. */
xassert (it->glyph_row == NULL);
produce_special_glyphs (it, IT_TRUNCATION);
it->truncation_pixel_width = it->pixel_width;
}
else
{
/* We will need the continuation glyph. */
xassert (it->glyph_row == NULL);
produce_special_glyphs (it, IT_CONTINUATION);
it->continuation_pixel_width = it->pixel_width;
}
/* Reset these values to zero because the produce_special_glyphs
above has changed them. */
it->pixel_width = it->ascent = it->descent = 0;
it->phys_ascent = it->phys_descent = 0;
}
/* Set this after getting the dimensions of truncation and
continuation glyphs, so that we don't produce glyphs when calling
produce_special_glyphs, above. */
it->glyph_row = row;
it->area = TEXT_AREA;
/* Get the dimensions of the display area. The display area
consists of the visible window area plus a horizontally scrolled
part to the left of the window. All x-values are relative to the
start of this total display area. */
if (base_face_id != DEFAULT_FACE_ID)
{
/* Mode lines, menu bar in terminal frames. */
it->first_visible_x = 0;
it->last_visible_x = WINDOW_TOTAL_WIDTH (w);
}
else
{
it->first_visible_x
= XFASTINT (it->w->hscroll) * FRAME_COLUMN_WIDTH (it->f);
it->last_visible_x = (it->first_visible_x
+ window_box_width (w, TEXT_AREA));
/* If we truncate lines, leave room for the truncator glyph(s) at
the right margin. Otherwise, leave room for the continuation
glyph(s). Truncation and continuation glyphs are not inserted
for window-based redisplay. */
if (!FRAME_WINDOW_P (it->f))
{
if (it->line_wrap == TRUNCATE)
it->last_visible_x -= it->truncation_pixel_width;
else
it->last_visible_x -= it->continuation_pixel_width;
}
it->header_line_p = WINDOW_WANTS_HEADER_LINE_P (w);
it->current_y = WINDOW_HEADER_LINE_HEIGHT (w) + w->vscroll;
}
/* Leave room for a border glyph. */
if (!FRAME_WINDOW_P (it->f)
&& !WINDOW_RIGHTMOST_P (it->w))
it->last_visible_x -= 1;
it->last_visible_y = window_text_bottom_y (w);
/* For mode lines and alike, arrange for the first glyph having a
left box line if the face specifies a box. */
if (base_face_id != DEFAULT_FACE_ID)
{
struct face *face;
it->face_id = remapped_base_face_id;
/* If we have a boxed mode line, make the first character appear
with a left box line. */
face = FACE_FROM_ID (it->f, remapped_base_face_id);
if (face->box != FACE_NO_BOX)
it->start_of_box_run_p = 1;
}
/* If a buffer position was specified, set the iterator there,
getting overlays and face properties from that position. */
if (charpos >= BUF_BEG (current_buffer))
{
it->end_charpos = ZV;
it->face_id = -1;
IT_CHARPOS (*it) = charpos;
/* Compute byte position if not specified. */
if (bytepos < charpos)
IT_BYTEPOS (*it) = CHAR_TO_BYTE (charpos);
else
IT_BYTEPOS (*it) = bytepos;
it->start = it->current;
/* Compute faces etc. */
reseat (it, it->current.pos, 1);
}
CHECK_IT (it);
}
/* Initialize IT for the display of window W with window start POS. */
void
start_display (it, w, pos)
struct it *it;
struct window *w;
struct text_pos pos;
{
struct glyph_row *row;
int first_vpos = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0;
row = w->desired_matrix->rows + first_vpos;
init_iterator (it, w, CHARPOS (pos), BYTEPOS (pos), row, DEFAULT_FACE_ID);
it->first_vpos = first_vpos;
/* Don't reseat to previous visible line start if current start
position is in a string or image. */
if (it->method == GET_FROM_BUFFER && it->line_wrap != TRUNCATE)
{
int start_at_line_beg_p;
int first_y = it->current_y;
/* If window start is not at a line start, skip forward to POS to
get the correct continuation lines width. */
start_at_line_beg_p = (CHARPOS (pos) == BEGV
|| FETCH_BYTE (BYTEPOS (pos) - 1) == '\n');
if (!start_at_line_beg_p)
{
int new_x;
reseat_at_previous_visible_line_start (it);
move_it_to (it, CHARPOS (pos), -1, -1, -1, MOVE_TO_POS);
new_x = it->current_x + it->pixel_width;
/* If lines are continued, this line may end in the middle
of a multi-glyph character (e.g. a control character
displayed as \003, or in the middle of an overlay
string). In this case move_it_to above will not have
taken us to the start of the continuation line but to the
end of the continued line. */
if (it->current_x > 0
&& it->line_wrap != TRUNCATE /* Lines are continued. */
&& (/* And glyph doesn't fit on the line. */
new_x > it->last_visible_x
/* Or it fits exactly and we're on a window
system frame. */
|| (new_x == it->last_visible_x
&& FRAME_WINDOW_P (it->f))))
{
if (it->current.dpvec_index >= 0
|| it->current.overlay_string_index >= 0)
{
set_iterator_to_next (it, 1);
move_it_in_display_line_to (it, -1, -1, 0);
}
it->continuation_lines_width += it->current_x;
}
/* We're starting a new display line, not affected by the
height of the continued line, so clear the appropriate
fields in the iterator structure. */
it->max_ascent = it->max_descent = 0;
it->max_phys_ascent = it->max_phys_descent = 0;
it->current_y = first_y;
it->vpos = 0;
it->current_x = it->hpos = 0;
}
}
}
/* Return 1 if POS is a position in ellipses displayed for invisible
text. W is the window we display, for text property lookup. */
static int
in_ellipses_for_invisible_text_p (pos, w)
struct display_pos *pos;
struct window *w;
{
Lisp_Object prop, window;
int ellipses_p = 0;
int charpos = CHARPOS (pos->pos);
/* If POS specifies a position in a display vector, this might
be for an ellipsis displayed for invisible text. We won't
get the iterator set up for delivering that ellipsis unless
we make sure that it gets aware of the invisible text. */
if (pos->dpvec_index >= 0
&& pos->overlay_string_index < 0
&& CHARPOS (pos->string_pos) < 0
&& charpos > BEGV
&& (XSETWINDOW (window, w),
prop = Fget_char_property (make_number (charpos),
Qinvisible, window),
!TEXT_PROP_MEANS_INVISIBLE (prop)))
{
prop = Fget_char_property (make_number (charpos - 1), Qinvisible,
window);
ellipses_p = 2 == TEXT_PROP_MEANS_INVISIBLE (prop);
}
return ellipses_p;
}
/* Initialize IT for stepping through current_buffer in window W,
starting at position POS that includes overlay string and display
vector/ control character translation position information. Value
is zero if there are overlay strings with newlines at POS. */
static int
init_from_display_pos (it, w, pos)
struct it *it;
struct window *w;
struct display_pos *pos;
{
int charpos = CHARPOS (pos->pos), bytepos = BYTEPOS (pos->pos);
int i, overlay_strings_with_newlines = 0;
/* If POS specifies a position in a display vector, this might
be for an ellipsis displayed for invisible text. We won't
get the iterator set up for delivering that ellipsis unless
we make sure that it gets aware of the invisible text. */
if (in_ellipses_for_invisible_text_p (pos, w))
{
--charpos;
bytepos = 0;
}
/* Keep in mind: the call to reseat in init_iterator skips invisible
text, so we might end up at a position different from POS. This
is only a problem when POS is a row start after a newline and an
overlay starts there with an after-string, and the overlay has an
invisible property. Since we don't skip invisible text in
display_line and elsewhere immediately after consuming the
newline before the row start, such a POS will not be in a string,
but the call to init_iterator below will move us to the
after-string. */
init_iterator (it, w, charpos, bytepos, NULL, DEFAULT_FACE_ID);
/* This only scans the current chunk -- it should scan all chunks.
However, OVERLAY_STRING_CHUNK_SIZE has been increased from 3 in 21.1
to 16 in 22.1 to make this a lesser problem. */
for (i = 0; i < it->n_overlay_strings && i < OVERLAY_STRING_CHUNK_SIZE; ++i)
{
const char *s = SDATA (it->overlay_strings[i]);
const char *e = s + SBYTES (it->overlay_strings[i]);
while (s < e && *s != '\n')
++s;
if (s < e)
{
overlay_strings_with_newlines = 1;
break;
}
}
/* If position is within an overlay string, set up IT to the right
overlay string. */
if (pos->overlay_string_index >= 0)
{
int relative_index;
/* If the first overlay string happens to have a `display'
property for an image, the iterator will be set up for that
image, and we have to undo that setup first before we can
correct the overlay string index. */
if (it->method == GET_FROM_IMAGE)
pop_it (it);
/* We already have the first chunk of overlay strings in
IT->overlay_strings. Load more until the one for
pos->overlay_string_index is in IT->overlay_strings. */
if (pos->overlay_string_index >= OVERLAY_STRING_CHUNK_SIZE)
{
int n = pos->overlay_string_index / OVERLAY_STRING_CHUNK_SIZE;
it->current.overlay_string_index = 0;
while (n--)
{
load_overlay_strings (it, 0);
it->current.overlay_string_index += OVERLAY_STRING_CHUNK_SIZE;
}
}
it->current.overlay_string_index = pos->overlay_string_index;
relative_index = (it->current.overlay_string_index
% OVERLAY_STRING_CHUNK_SIZE);
it->string = it->overlay_strings[relative_index];
xassert (STRINGP (it->string));
it->current.string_pos = pos->string_pos;
it->method = GET_FROM_STRING;
}
if (CHARPOS (pos->string_pos) >= 0)
{
/* Recorded position is not in an overlay string, but in another
string. This can only be a string from a `display' property.
IT should already be filled with that string. */
it->current.string_pos = pos->string_pos;
xassert (STRINGP (it->string));
}
/* Restore position in display vector translations, control
character translations or ellipses. */
if (pos->dpvec_index >= 0)
{
if (it->dpvec == NULL)
get_next_display_element (it);
xassert (it->dpvec && it->current.dpvec_index == 0);
it->current.dpvec_index = pos->dpvec_index;
}
CHECK_IT (it);
return !overlay_strings_with_newlines;
}
/* Initialize IT for stepping through current_buffer in window W
starting at ROW->start. */
static void
init_to_row_start (it, w, row)
struct it *it;
struct window *w;
struct glyph_row *row;
{
init_from_display_pos (it, w, &row->start);
it->start = row->start;
it->continuation_lines_width = row->continuation_lines_width;
CHECK_IT (it);
}
/* Initialize IT for stepping through current_buffer in window W
starting in the line following ROW, i.e. starting at ROW->end.
Value is zero if there are overlay strings with newlines at ROW's
end position. */
static int
init_to_row_end (it, w, row)
struct it *it;
struct window *w;
struct glyph_row *row;
{
int success = 0;
if (init_from_display_pos (it, w, &row->end))
{
if (row->continued_p)
it->continuation_lines_width
= row->continuation_lines_width + row->pixel_width;
CHECK_IT (it);
success = 1;
}
return success;
}
/***********************************************************************
Text properties
***********************************************************************/
/* Called when IT reaches IT->stop_charpos. Handle text property and
overlay changes. Set IT->stop_charpos to the next position where
to stop. */
static void
handle_stop (it)
struct it *it;
{
enum prop_handled handled;
int handle_overlay_change_p;
struct props *p;
it->dpvec = NULL;
it->current.dpvec_index = -1;
handle_overlay_change_p = !it->ignore_overlay_strings_at_pos_p;
it->ignore_overlay_strings_at_pos_p = 0;
it->ellipsis_p = 0;
/* Use face of preceding text for ellipsis (if invisible) */
if (it->selective_display_ellipsis_p)
it->saved_face_id = it->face_id;
do
{
handled = HANDLED_NORMALLY;
/* Call text property handlers. */
for (p = it_props; p->handler; ++p)
{
handled = p->handler (it);
if (handled == HANDLED_RECOMPUTE_PROPS)
break;
else if (handled == HANDLED_RETURN)
{
/* We still want to show before and after strings from
overlays even if the actual buffer text is replaced. */
if (!handle_overlay_change_p
|| it->sp > 1
|| !get_overlay_strings_1 (it, 0, 0))
{
if (it->ellipsis_p)
setup_for_ellipsis (it, 0);
/* When handling a display spec, we might load an
empty string. In that case, discard it here. We
used to discard it in handle_single_display_spec,
but that causes get_overlay_strings_1, above, to
ignore overlay strings that we must check. */
if (STRINGP (it->string) && !SCHARS (it->string))
pop_it (it);
return;
}
else if (STRINGP (it->string) && !SCHARS (it->string))
pop_it (it);
else
{
it->ignore_overlay_strings_at_pos_p = 1;
it->string_from_display_prop_p = 0;
handle_overlay_change_p = 0;
}
handled = HANDLED_RECOMPUTE_PROPS;
break;
}
else if (handled == HANDLED_OVERLAY_STRING_CONSUMED)
handle_overlay_change_p = 0;
}
if (handled != HANDLED_RECOMPUTE_PROPS)
{
/* Don't check for overlay strings below when set to deliver
characters from a display vector. */
if (it->method == GET_FROM_DISPLAY_VECTOR)
handle_overlay_change_p = 0;
/* Handle overlay changes.
This sets HANDLED to HANDLED_RECOMPUTE_PROPS
if it finds overlays. */
if (handle_overlay_change_p)
handled = handle_overlay_change (it);
}
if (it->ellipsis_p)
{
setup_for_ellipsis (it, 0);
break;
}
}
while (handled == HANDLED_RECOMPUTE_PROPS);
/* Determine where to stop next. */
if (handled == HANDLED_NORMALLY)
compute_stop_pos (it);
}
/* Compute IT->stop_charpos from text property and overlay change
information for IT's current position. */
static void
compute_stop_pos (it)
struct it *it;
{
register INTERVAL iv, next_iv;
Lisp_Object object, limit, position;
EMACS_INT charpos, bytepos;
/* If nowhere else, stop at the end. */
it->stop_charpos = it->end_charpos;
if (STRINGP (it->string))
{
/* Strings are usually short, so don't limit the search for
properties. */
object = it->string;
limit = Qnil;
charpos = IT_STRING_CHARPOS (*it);
bytepos = IT_STRING_BYTEPOS (*it);
}
else
{
EMACS_INT pos;
/* If next overlay change is in front of the current stop pos
(which is IT->end_charpos), stop there. Note: value of
next_overlay_change is point-max if no overlay change
follows. */
charpos = IT_CHARPOS (*it);
bytepos = IT_BYTEPOS (*it);
pos = next_overlay_change (charpos);
if (pos < it->stop_charpos)
it->stop_charpos = pos;
/* If showing the region, we have to stop at the region
start or end because the face might change there. */
if (it->region_beg_charpos > 0)
{
if (IT_CHARPOS (*it) < it->region_beg_charpos)
it->stop_charpos = min (it->stop_charpos, it->region_beg_charpos);
else if (IT_CHARPOS (*it) < it->region_end_charpos)
it->stop_charpos = min (it->stop_charpos, it->region_end_charpos);
}
/* Set up variables for computing the stop position from text
property changes. */
XSETBUFFER (object, current_buffer);
limit = make_number (IT_CHARPOS (*it) + TEXT_PROP_DISTANCE_LIMIT);
}
/* Get the interval containing IT's position. Value is a null
interval if there isn't such an interval. */
position = make_number (charpos);
iv = validate_interval_range (object, &position, &position, 0);
if (!NULL_INTERVAL_P (iv))
{
Lisp_Object values_here[LAST_PROP_IDX];
struct props *p;
/* Get properties here. */
for (p = it_props; p->handler; ++p)
values_here[p->idx] = textget (iv->plist, *p->name);
/* Look for an interval following iv that has different
properties. */
for (next_iv = next_interval (iv);
(!NULL_INTERVAL_P (next_iv)
&& (NILP (limit)
|| XFASTINT (limit) > next_iv->position));
next_iv = next_interval (next_iv))
{
for (p = it_props; p->handler; ++p)
{
Lisp_Object new_value;
new_value = textget (next_iv->plist, *p->name);
if (!EQ (values_here[p->idx], new_value))
break;
}
if (p->handler)
break;
}
if (!NULL_INTERVAL_P (next_iv))
{
if (INTEGERP (limit)
&& next_iv->position >= XFASTINT (limit))
/* No text property change up to limit. */
it->stop_charpos = min (XFASTINT (limit), it->stop_charpos);
else
/* Text properties change in next_iv. */
it->stop_charpos = min (it->stop_charpos, next_iv->position);
}
}
composition_compute_stop_pos (&it->cmp_it, charpos, bytepos,
it->stop_charpos, it->string);
xassert (STRINGP (it->string)
|| (it->stop_charpos >= BEGV
&& it->stop_charpos >= IT_CHARPOS (*it)));
}
/* Return the position of the next overlay change after POS in
current_buffer. Value is point-max if no overlay change
follows. This is like `next-overlay-change' but doesn't use
xmalloc. */
static EMACS_INT
next_overlay_change (pos)
EMACS_INT pos;
{
int noverlays;
EMACS_INT endpos;
Lisp_Object *overlays;
int i;
/* Get all overlays at the given position. */
GET_OVERLAYS_AT (pos, overlays, noverlays, &endpos, 1);
/* If any of these overlays ends before endpos,
use its ending point instead. */
for (i = 0; i < noverlays; ++i)
{
Lisp_Object oend;
EMACS_INT oendpos;
oend = OVERLAY_END (overlays[i]);
oendpos = OVERLAY_POSITION (oend);
endpos = min (endpos, oendpos);
}
return endpos;
}
/***********************************************************************
Fontification
***********************************************************************/
/* Handle changes in the `fontified' property of the current buffer by
calling hook functions from Qfontification_functions to fontify
regions of text. */
static enum prop_handled
handle_fontified_prop (it)
struct it *it;
{
Lisp_Object prop, pos;
enum prop_handled handled = HANDLED_NORMALLY;
if (!NILP (Vmemory_full))
return handled;
/* Get the value of the `fontified' property at IT's current buffer
position. (The `fontified' property doesn't have a special
meaning in strings.) If the value is nil, call functions from
Qfontification_functions. */
if (!STRINGP (it->string)
&& it->s == NULL
&& !NILP (Vfontification_functions)
&& !NILP (Vrun_hooks)
&& (pos = make_number (IT_CHARPOS (*it)),
prop = Fget_char_property (pos, Qfontified, Qnil),
/* Ignore the special cased nil value always present at EOB since
no amount of fontifying will be able to change it. */
NILP (prop) && IT_CHARPOS (*it) < Z))
{
int count = SPECPDL_INDEX ();
Lisp_Object val;
val = Vfontification_functions;
specbind (Qfontification_functions, Qnil);
if (!CONSP (val) || EQ (XCAR (val), Qlambda))
safe_call1 (val, pos);
else
{
Lisp_Object globals, fn;
struct gcpro gcpro1, gcpro2;
globals = Qnil;
GCPRO2 (val, globals);
for (; CONSP (val); val = XCDR (val))
{
fn = XCAR (val);
if (EQ (fn, Qt))
{
/* A value of t indicates this hook has a local
binding; it means to run the global binding too.
In a global value, t should not occur. If it
does, we must ignore it to avoid an endless
loop. */
for (globals = Fdefault_value (Qfontification_functions);
CONSP (globals);
globals = XCDR (globals))
{
fn = XCAR (globals);
if (!EQ (fn, Qt))
safe_call1 (fn, pos);
}
}
else
safe_call1 (fn, pos);
}
UNGCPRO;
}
unbind_to (count, Qnil);
/* Return HANDLED_RECOMPUTE_PROPS only if function fontified
something. This avoids an endless loop if they failed to
fontify the text for which reason ever. */
if (!NILP (Fget_char_property (pos, Qfontified, Qnil)))
handled = HANDLED_RECOMPUTE_PROPS;
}
return handled;
}
/***********************************************************************
Faces
***********************************************************************/
/* Set up iterator IT from face properties at its current position.
Called from handle_stop. */
static enum prop_handled
handle_face_prop (it)
struct it *it;
{
int new_face_id;
EMACS_INT next_stop;
if (!STRINGP (it->string))
{
new_face_id
= face_at_buffer_position (it->w,
IT_CHARPOS (*it),
it->region_beg_charpos,
it->region_end_charpos,
&next_stop,
(IT_CHARPOS (*it)
+ TEXT_PROP_DISTANCE_LIMIT),
0, it->base_face_id);
/* Is this a start of a run of characters with box face?
Caveat: this can be called for a freshly initialized
iterator; face_id is -1 in this case. We know that the new
face will not change until limit, i.e. if the new face has a
box, all characters up to limit will have one. But, as
usual, we don't know whether limit is really the end. */
if (new_face_id != it->face_id)
{
struct face *new_face = FACE_FROM_ID (it->f, new_face_id);
/* If new face has a box but old face has not, this is
the start of a run of characters with box, i.e. it has
a shadow on the left side. The value of face_id of the
iterator will be -1 if this is the initial call that gets
the face. In this case, we have to look in front of IT's
position and see whether there is a face != new_face_id. */
it->start_of_box_run_p
= (new_face->box != FACE_NO_BOX
&& (it->face_id >= 0
|| IT_CHARPOS (*it) == BEG
|| new_face_id != face_before_it_pos (it)));
it->face_box_p = new_face->box != FACE_NO_BOX;
}
}
else
{
int base_face_id, bufpos;
int i;
Lisp_Object from_overlay
= (it->current.overlay_string_index >= 0
? it->string_overlays[it->current.overlay_string_index]
: Qnil);
/* See if we got to this string directly or indirectly from
an overlay property. That includes the before-string or
after-string of an overlay, strings in display properties
provided by an overlay, their text properties, etc.
FROM_OVERLAY is the overlay that brought us here, or nil if none. */
if (! NILP (from_overlay))
for (i = it->sp - 1; i >= 0; i--)
{
if (it->stack[i].current.overlay_string_index >= 0)
from_overlay
= it->string_overlays[it->stack[i].current.overlay_string_index];
else if (! NILP (it->stack[i].from_overlay))
from_overlay = it->stack[i].from_overlay;
if (!NILP (from_overlay))
break;
}
if (! NILP (from_overlay))
{
bufpos = IT_CHARPOS (*it);
/* For a string from an overlay, the base face depends
only on text properties and ignores overlays. */
base_face_id
= face_for_overlay_string (it->w,
IT_CHARPOS (*it),
it->region_beg_charpos,
it->region_end_charpos,
&next_stop,
(IT_CHARPOS (*it)
+ TEXT_PROP_DISTANCE_LIMIT),
0,
from_overlay);
}
else
{
bufpos = 0;
/* For strings from a `display' property, use the face at
IT's current buffer position as the base face to merge
with, so that overlay strings appear in the same face as
surrounding text, unless they specify their own
faces. */
base_face_id = underlying_face_id (it);
}
new_face_id = face_at_string_position (it->w,
it->string,
IT_STRING_CHARPOS (*it),
bufpos,
it->region_beg_charpos,
it->region_end_charpos,
&next_stop,
base_face_id, 0);
/* Is this a start of a run of characters with box? Caveat:
this can be called for a freshly allocated iterator; face_id
is -1 is this case. We know that the new face will not
change until the next check pos, i.e. if the new face has a
box, all characters up to that position will have a
box. But, as usual, we don't know whether that position
is really the end. */
if (new_face_id != it->face_id)
{
struct face *new_face = FACE_FROM_ID (it->f, new_face_id);
struct face *old_face = FACE_FROM_ID (it->f, it->face_id);
/* If new face has a box but old face hasn't, this is the
start of a run of characters with box, i.e. it has a
shadow on the left side. */
it->start_of_box_run_p
= new_face->box && (old_face == NULL || !old_face->box);
it->face_box_p = new_face->box != FACE_NO_BOX;
}
}
it->face_id = new_face_id;
return HANDLED_NORMALLY;
}
/* Return the ID of the face ``underlying'' IT's current position,
which is in a string. If the iterator is associated with a
buffer, return the face at IT's current buffer position.
Otherwise, use the iterator's base_face_id. */
static int
underlying_face_id (it)
struct it *it;
{
int face_id = it->base_face_id, i;
xassert (STRINGP (it->string));
for (i = it->sp - 1; i >= 0; --i)
if (NILP (it->stack[i].string))
face_id = it->stack[i].face_id;
return face_id;
}
/* Compute the face one character before or after the current position
of IT. BEFORE_P non-zero means get the face in front of IT's
position. Value is the id of the face. */
static int
face_before_or_after_it_pos (it, before_p)
struct it *it;
int before_p;
{
int face_id, limit;
EMACS_INT next_check_charpos;
struct text_pos pos;
xassert (it->s == NULL);
if (STRINGP (it->string))
{
int bufpos, base_face_id;
/* No face change past the end of the string (for the case
we are padding with spaces). No face change before the
string start. */
if (IT_STRING_CHARPOS (*it) >= SCHARS (it->string)
|| (IT_STRING_CHARPOS (*it) == 0 && before_p))
return it->face_id;
/* Set pos to the position before or after IT's current position. */
if (before_p)
pos = string_pos (IT_STRING_CHARPOS (*it) - 1, it->string);
else
/* For composition, we must check the character after the
composition. */
pos = (it->what == IT_COMPOSITION
? string_pos (IT_STRING_CHARPOS (*it)
+ it->cmp_it.nchars, it->string)
: string_pos (IT_STRING_CHARPOS (*it) + 1, it->string));
if (it->current.overlay_string_index >= 0)
bufpos = IT_CHARPOS (*it);
else
bufpos = 0;
base_face_id = underlying_face_id (it);
/* Get the face for ASCII, or unibyte. */
face_id = face_at_string_position (it->w,
it->string,
CHARPOS (pos),
bufpos,
it->region_beg_charpos,
it->region_end_charpos,
&next_check_charpos,
base_face_id, 0);
/* Correct the face for charsets different from ASCII. Do it
for the multibyte case only. The face returned above is
suitable for unibyte text if IT->string is unibyte. */
if (STRING_MULTIBYTE (it->string))
{
const unsigned char *p = SDATA (it->string) + BYTEPOS (pos);
int rest = SBYTES (it->string) - BYTEPOS (pos);
int c, len;
struct face *face = FACE_FROM_ID (it->f, face_id);
c = string_char_and_length (p, &len);
face_id = FACE_FOR_CHAR (it->f, face, c, CHARPOS (pos), it->string);
}
}
else
{
if ((IT_CHARPOS (*it) >= ZV && !before_p)
|| (IT_CHARPOS (*it) <= BEGV && before_p))
return it->face_id;
limit = IT_CHARPOS (*it) + TEXT_PROP_DISTANCE_LIMIT;
pos = it->current.pos;
if (before_p)
DEC_TEXT_POS (pos, it->multibyte_p);
else
{
if (it->what == IT_COMPOSITION)
/* For composition, we must check the position after the
composition. */
pos.charpos += it->cmp_it.nchars, pos.bytepos += it->len;
else
INC_TEXT_POS (pos, it->multibyte_p);
}
/* Determine face for CHARSET_ASCII, or unibyte. */
face_id = face_at_buffer_position (it->w,
CHARPOS (pos),
it->region_beg_charpos,
it->region_end_charpos,
&next_check_charpos,
limit, 0, -1);
/* Correct the face for charsets different from ASCII. Do it
for the multibyte case only. The face returned above is
suitable for unibyte text if current_buffer is unibyte. */
if (it->multibyte_p)
{
int c = FETCH_MULTIBYTE_CHAR (BYTEPOS (pos));
struct face *face = FACE_FROM_ID (it->f, face_id);
face_id = FACE_FOR_CHAR (it->f, face, c, CHARPOS (pos), Qnil);
}
}
return face_id;
}
/***********************************************************************
Invisible text
***********************************************************************/
/* Set up iterator IT from invisible properties at its current
position. Called from handle_stop. */
static enum prop_handled
handle_invisible_prop (it)
struct it *it;
{
enum prop_handled handled = HANDLED_NORMALLY;
if (STRINGP (it->string))
{
extern Lisp_Object Qinvisible;
Lisp_Object prop, end_charpos, limit, charpos;
/* Get the value of the invisible text property at the
current position. Value will be nil if there is no such
property. */
charpos = make_number (IT_STRING_CHARPOS (*it));
prop = Fget_text_property (charpos, Qinvisible, it->string);
if (!NILP (prop)
&& IT_STRING_CHARPOS (*it) < it->end_charpos)
{
handled = HANDLED_RECOMPUTE_PROPS;
/* Get the position at which the next change of the
invisible text property can be found in IT->string.
Value will be nil if the property value is the same for
all the rest of IT->string. */
XSETINT (limit, SCHARS (it->string));
end_charpos = Fnext_single_property_change (charpos, Qinvisible,
it->string, limit);
/* Text at current position is invisible. The next
change in the property is at position end_charpos.
Move IT's current position to that position. */
if (INTEGERP (end_charpos)
&& XFASTINT (end_charpos) < XFASTINT (limit))
{
struct text_pos old;
old = it->current.string_pos;
IT_STRING_CHARPOS (*it) = XFASTINT (end_charpos);
compute_string_pos (&it->current.string_pos, old, it->string);
}
else
{
/* The rest of the string is invisible. If this is an
overlay string, proceed with the next overlay string
or whatever comes and return a character from there. */
if (it->current.overlay_string_index >= 0)
{
next_overlay_string (it);
/* Don't check for overlay strings when we just
finished processing them. */
handled = HANDLED_OVERLAY_STRING_CONSUMED;
}
else
{
IT_STRING_CHARPOS (*it) = SCHARS (it->string);
IT_STRING_BYTEPOS (*it) = SBYTES (it->string);
}
}
}
}
else
{
int invis_p;
EMACS_INT newpos, next_stop, start_charpos;
Lisp_Object pos, prop, overlay;
/* First of all, is there invisible text at this position? */
start_charpos = IT_CHARPOS (*it);
pos = make_number (IT_CHARPOS (*it));
prop = get_char_property_and_overlay (pos, Qinvisible, it->window,
&overlay);
invis_p = TEXT_PROP_MEANS_INVISIBLE (prop);
/* If we are on invisible text, skip over it. */
if (invis_p && IT_CHARPOS (*it) < it->end_charpos)
{
/* Record whether we have to display an ellipsis for the
invisible text. */
int display_ellipsis_p = invis_p == 2;
handled = HANDLED_RECOMPUTE_PROPS;
/* Loop skipping over invisible text. The loop is left at
ZV or with IT on the first char being visible again. */
do
{
/* Try to skip some invisible text. Return value is the
position reached which can be equal to IT's position
if there is nothing invisible here. This skips both
over invisible text properties and overlays with
invisible property. */
newpos = skip_invisible (IT_CHARPOS (*it),
&next_stop, ZV, it->window);
/* If we skipped nothing at all we weren't at invisible
text in the first place. If everything to the end of
the buffer was skipped, end the loop. */
if (newpos == IT_CHARPOS (*it) || newpos >= ZV)
invis_p = 0;
else
{
/* We skipped some characters but not necessarily
all there are. Check if we ended up on visible
text. Fget_char_property returns the property of
the char before the given position, i.e. if we
get invis_p = 0, this means that the char at
newpos is visible. */
pos = make_number (newpos);
prop = Fget_char_property (pos, Qinvisible, it->window);
invis_p = TEXT_PROP_MEANS_INVISIBLE (prop);
}
/* If we ended up on invisible text, proceed to
skip starting with next_stop. */
if (invis_p)
IT_CHARPOS (*it) = next_stop;
/* If there are adjacent invisible texts, don't lose the
second one's ellipsis. */
if (invis_p == 2)
display_ellipsis_p = 1;
}
while (invis_p);
/* The position newpos is now either ZV or on visible text. */
IT_CHARPOS (*it) = newpos;
IT_BYTEPOS (*it) = CHAR_TO_BYTE (newpos);
/* If there are before-strings at the start of invisible
text, and the text is invisible because of a text
property, arrange to show before-strings because 20.x did
it that way. (If the text is invisible because of an
overlay property instead of a text property, this is
already handled in the overlay code.) */
if (NILP (overlay)
&& get_overlay_strings (it, start_charpos))
{
handled = HANDLED_RECOMPUTE_PROPS;
it->stack[it->sp - 1].display_ellipsis_p = display_ellipsis_p;
}
else if (display_ellipsis_p)
{
/* Make sure that the glyphs of the ellipsis will get
correct `charpos' values. If we would not update
it->position here, the glyphs would belong to the
last visible character _before_ the invisible
text, which confuses `set_cursor_from_row'.
We use the last invisible position instead of the
first because this way the cursor is always drawn on
the first "." of the ellipsis, whenever PT is inside
the invisible text. Otherwise the cursor would be
placed _after_ the ellipsis when the point is after the
first invisible character. */
if (!STRINGP (it->object))
{
it->position.charpos = IT_CHARPOS (*it) - 1;
it->position.bytepos = CHAR_TO_BYTE (it->position.charpos);
}
it->ellipsis_p = 1;
/* Let the ellipsis display before
considering any properties of the following char.
Fixes jasonr@gnu.org 01 Oct 07 bug. */
handled = HANDLED_RETURN;
}
}
}
return handled;
}
/* Make iterator IT return `...' next.
Replaces LEN characters from buffer. */
static void
setup_for_ellipsis (it, len)
struct it *it;
int len;
{
/* Use the display table definition for `...'. Invalid glyphs
will be handled by the method returning elements from dpvec. */
if (it->dp && VECTORP (DISP_INVIS_VECTOR (it->dp)))
{
struct Lisp_Vector *v = XVECTOR (DISP_INVIS_VECTOR (it->dp));
it->dpvec = v->contents;
it->dpend = v->contents + v->size;
}
else
{
/* Default `...'. */
it->dpvec = default_invis_vector;
it->dpend = default_invis_vector + 3;
}
it->dpvec_char_len = len;
it->current.dpvec_index = 0;
it->dpvec_face_id = -1;
/* Remember the current face id in case glyphs specify faces.
IT's face is restored in set_iterator_to_next.
saved_face_id was set to preceding char's face in handle_stop. */
if (it->saved_face_id < 0 || it->saved_face_id != it->face_id)
it->saved_face_id = it->face_id = DEFAULT_FACE_ID;
it->method = GET_FROM_DISPLAY_VECTOR;
it->ellipsis_p = 1;
}
/***********************************************************************
'display' property
***********************************************************************/
/* Set up iterator IT from `display' property at its current position.
Called from handle_stop.
We return HANDLED_RETURN if some part of the display property
overrides the display of the buffer text itself.
Otherwise we return HANDLED_NORMALLY. */
static enum prop_handled
handle_display_prop (it)
struct it *it;
{
Lisp_Object prop, object, overlay;
struct text_pos *position;
/* Nonzero if some property replaces the display of the text itself. */
int display_replaced_p = 0;
if (STRINGP (it->string))
{
object = it->string;
position = &it->current.string_pos;
}
else
{
XSETWINDOW (object, it->w);
position = &it->current.pos;
}
/* Reset those iterator values set from display property values. */
it->slice.x = it->slice.y = it->slice.width = it->slice.height = Qnil;
it->space_width = Qnil;
it->font_height = Qnil;
it->voffset = 0;
/* We don't support recursive `display' properties, i.e. string
values that have a string `display' property, that have a string
`display' property etc. */
if (!it->string_from_display_prop_p)
it->area = TEXT_AREA;
prop = get_char_property_and_overlay (make_number (position->charpos),
Qdisplay, object, &overlay);
if (NILP (prop))
return HANDLED_NORMALLY;
/* Now OVERLAY is the overlay that gave us this property, or nil
if it was a text property. */
if (!STRINGP (it->string))
object = it->w->buffer;
if (CONSP (prop)
/* Simple properties. */
&& !EQ (XCAR (prop), Qimage)
&& !EQ (XCAR (prop), Qspace)
&& !EQ (XCAR (prop), Qwhen)
&& !EQ (XCAR (prop), Qslice)
&& !EQ (XCAR (prop), Qspace_width)
&& !EQ (XCAR (prop), Qheight)
&& !EQ (XCAR (prop), Qraise)
/* Marginal area specifications. */
&& !(CONSP (XCAR (prop)) && EQ (XCAR (XCAR (prop)), Qmargin))
&& !EQ (XCAR (prop), Qleft_fringe)
&& !EQ (XCAR (prop), Qright_fringe)
&& !NILP (XCAR (prop)))
{
for (; CONSP (prop); prop = XCDR (prop))
{
if (handle_single_display_spec (it, XCAR (prop), object, overlay,
position, display_replaced_p))
{
display_replaced_p = 1;
/* If some text in a string is replaced, `position' no
longer points to the position of `object'. */
if (STRINGP (object))
break;
}
}
}
else if (VECTORP (prop))
{
int i;
for (i = 0; i < ASIZE (prop); ++i)
if (handle_single_display_spec (it, AREF (prop, i), object, overlay,
position, display_replaced_p))
{
display_replaced_p = 1;
/* If some text in a string is replaced, `position' no
longer points to the position of `object'. */
if (STRINGP (object))
break;
}
}
else
{
if (handle_single_display_spec (it, prop, object, overlay,
position, 0))
display_replaced_p = 1;
}
return display_replaced_p ? HANDLED_RETURN : HANDLED_NORMALLY;
}
/* Value is the position of the end of the `display' property starting
at START_POS in OBJECT. */
static struct text_pos
display_prop_end (it, object, start_pos)
struct it *it;
Lisp_Object object;
struct text_pos start_pos;
{
Lisp_Object end;
struct text_pos end_pos;
end = Fnext_single_char_property_change (make_number (CHARPOS (start_pos)),
Qdisplay, object, Qnil);
CHARPOS (end_pos) = XFASTINT (end);
if (STRINGP (object))
compute_string_pos (&end_pos, start_pos, it->string);
else
BYTEPOS (end_pos) = CHAR_TO_BYTE (XFASTINT (end));
return end_pos;
}
/* Set up IT from a single `display' specification PROP. OBJECT
is the object in which the `display' property was found. *POSITION
is the position at which it was found. DISPLAY_REPLACED_P non-zero
means that we previously saw a display specification which already
replaced text display with something else, for example an image;
we ignore such properties after the first one has been processed.
OVERLAY is the overlay this `display' property came from,
or nil if it was a text property.
If PROP is a `space' or `image' specification, and in some other
cases too, set *POSITION to the position where the `display'
property ends.
Value is non-zero if something was found which replaces the display
of buffer or string text. */
static int
handle_single_display_spec (it, spec, object, overlay, position,
display_replaced_before_p)
struct it *it;
Lisp_Object spec;
Lisp_Object object;
Lisp_Object overlay;
struct text_pos *position;
int display_replaced_before_p;
{
Lisp_Object form;
Lisp_Object location, value;
struct text_pos start_pos, save_pos;
int valid_p;
/* If SPEC is a list of the form `(when FORM . VALUE)', evaluate FORM.
If the result is non-nil, use VALUE instead of SPEC. */
form = Qt;
if (CONSP (spec) && EQ (XCAR (spec), Qwhen))
{
spec = XCDR (spec);
if (!CONSP (spec))
return 0;
form = XCAR (spec);
spec = XCDR (spec);
}
if (!NILP (form) && !EQ (form, Qt))
{
int count = SPECPDL_INDEX ();
struct gcpro gcpro1;
/* Bind `object' to the object having the `display' property, a
buffer or string. Bind `position' to the position in the
object where the property was found, and `buffer-position'
to the current position in the buffer. */
specbind (Qobject, object);
specbind (Qposition, make_number (CHARPOS (*position)));
specbind (Qbuffer_position,
make_number (STRINGP (object)
? IT_CHARPOS (*it) : CHARPOS (*position)));
GCPRO1 (form);
form = safe_eval (form);
UNGCPRO;
unbind_to (count, Qnil);
}
if (NILP (form))
return 0;
/* Handle `(height HEIGHT)' specifications. */
if (CONSP (spec)
&& EQ (XCAR (spec), Qheight)
&& CONSP (XCDR (spec)))
{
if (!FRAME_WINDOW_P (it->f))
return 0;
it->font_height = XCAR (XCDR (spec));
if (!NILP (it->font_height))
{
struct face *face = FACE_FROM_ID (it->f, it->face_id);
int new_height = -1;
if (CONSP (it->font_height)
&& (EQ (XCAR (it->font_height), Qplus)
|| EQ (XCAR (it->font_height), Qminus))
&& CONSP (XCDR (it->font_height))
&& INTEGERP (XCAR (XCDR (it->font_height))))
{
/* `(+ N)' or `(- N)' where N is an integer. */
int steps = XINT (XCAR (XCDR (it->font_height)));
if (EQ (XCAR (it->font_height), Qplus))
steps = - steps;
it->face_id = smaller_face (it->f, it->face_id, steps);
}
else if (FUNCTIONP (it->font_height))
{
/* Call function with current height as argument.
Value is the new height. */
Lisp_Object height;
height = safe_call1 (it->font_height,
face->lface[LFACE_HEIGHT_INDEX]);
if (NUMBERP (height))
new_height = XFLOATINT (height);
}
else if (NUMBERP (it->font_height))
{
/* Value is a multiple of the canonical char height. */
struct face *face;
face = FACE_FROM_ID (it->f,
lookup_basic_face (it->f, DEFAULT_FACE_ID));
new_height = (XFLOATINT (it->font_height)
* XINT (face->lface[LFACE_HEIGHT_INDEX]));
}
else
{
/* Evaluate IT->font_height with `height' bound to the
current specified height to get the new height. */
int count = SPECPDL_INDEX ();
specbind (Qheight, face->lface[LFACE_HEIGHT_INDEX]);
value = safe_eval (it->font_height);
unbind_to (count, Qnil);
if (NUMBERP (value))
new_height = XFLOATINT (value);
}
if (new_height > 0)
it->face_id = face_with_height (it->f, it->face_id, new_height);
}
return 0;
}
/* Handle `(space-width WIDTH)'. */
if (CONSP (spec)
&& EQ (XCAR (spec), Qspace_width)
&& CONSP (XCDR (spec)))
{
if (!FRAME_WINDOW_P (it->f))
return 0;
value = XCAR (XCDR (spec));
if (NUMBERP (value) && XFLOATINT (value) > 0)
it->space_width = value;
return 0;
}
/* Handle `(slice X Y WIDTH HEIGHT)'. */
if (CONSP (spec)
&& EQ (XCAR (spec), Qslice))
{
Lisp_Object tem;
if (!FRAME_WINDOW_P (it->f))
return 0;
if (tem = XCDR (spec), CONSP (tem))
{
it->slice.x = XCAR (tem);
if (tem = XCDR (tem), CONSP (tem))
{
it->slice.y = XCAR (tem);
if (tem = XCDR (tem), CONSP (tem))
{
it->slice.width = XCAR (tem);
if (tem = XCDR (tem), CONSP (tem))
it->slice.height = XCAR (tem);
}
}
}
return 0;
}
/* Handle `(raise FACTOR)'. */
if (CONSP (spec)
&& EQ (XCAR (spec), Qraise)
&& CONSP (XCDR (spec)))
{
if (!FRAME_WINDOW_P (it->f))
return 0;
#ifdef HAVE_WINDOW_SYSTEM
value = XCAR (XCDR (spec));
if (NUMBERP (value))
{
struct face *face = FACE_FROM_ID (it->f, it->face_id);
it->voffset = - (XFLOATINT (value)
* (FONT_HEIGHT (face->font)));
}
#endif /* HAVE_WINDOW_SYSTEM */
return 0;
}
/* Don't handle the other kinds of display specifications
inside a string that we got from a `display' property. */
if (it->string_from_display_prop_p)
return 0;
/* Characters having this form of property are not displayed, so
we have to find the end of the property. */
start_pos = *position;
*position = display_prop_end (it, object, start_pos);
value = Qnil;
/* Stop the scan at that end position--we assume that all
text properties change there. */
it->stop_charpos = position->charpos;
/* Handle `(left-fringe BITMAP [FACE])'
and `(right-fringe BITMAP [FACE])'. */
if (CONSP (spec)
&& (EQ (XCAR (spec), Qleft_fringe)
|| EQ (XCAR (spec), Qright_fringe))
&& CONSP (XCDR (spec)))
{
int face_id = lookup_basic_face (it->f, DEFAULT_FACE_ID);
int fringe_bitmap;
if (!FRAME_WINDOW_P (it->f))
/* If we return here, POSITION has been advanced
across the text with this property. */
return 0;
#ifdef HAVE_WINDOW_SYSTEM
value = XCAR (XCDR (spec));
if (!SYMBOLP (value)
|| !(fringe_bitmap = lookup_fringe_bitmap (value)))
/* If we return here, POSITION has been advanced
across the text with this property. */
return 0;
if (CONSP (XCDR (XCDR (spec))))
{
Lisp_Object face_name = XCAR (XCDR (XCDR (spec)));
int face_id2 = lookup_derived_face (it->f, face_name,
FRINGE_FACE_ID, 0);
if (face_id2 >= 0)
face_id = face_id2;
}
/* Save current settings of IT so that we can restore them
when we are finished with the glyph property value. */
save_pos = it->position;
it->position = *position;
push_it (it);
it->position = save_pos;
it->area = TEXT_AREA;
it->what = IT_IMAGE;
it->image_id = -1; /* no image */
it->position = start_pos;
it->object = NILP (object) ? it->w->buffer : object;
it->method = GET_FROM_IMAGE;
it->from_overlay = Qnil;
it->face_id = face_id;
/* Say that we haven't consumed the characters with
`display' property yet. The call to pop_it in
set_iterator_to_next will clean this up. */
*position = start_pos;
if (EQ (XCAR (spec), Qleft_fringe))
{
it->left_user_fringe_bitmap = fringe_bitmap;
it->left_user_fringe_face_id = face_id;
}
else
{
it->right_user_fringe_bitmap = fringe_bitmap;
it->right_user_fringe_face_id = face_id;
}
#endif /* HAVE_WINDOW_SYSTEM */
return 1;
}
/* Prepare to handle `((margin left-margin) ...)',
`((margin right-margin) ...)' and `((margin nil) ...)'
prefixes for display specifications. */
location = Qunbound;
if (CONSP (spec) && CONSP (XCAR (spec)))
{
Lisp_Object tem;
value = XCDR (spec);
if (CONSP (value))
value = XCAR (value);
tem = XCAR (spec);
if (EQ (XCAR (tem), Qmargin)
&& (tem = XCDR (tem),
tem = CONSP (tem) ? XCAR (tem) : Qnil,
(NILP (tem)
|| EQ (tem, Qleft_margin)
|| EQ (tem, Qright_margin))))
location = tem;
}
if (EQ (location, Qunbound))
{
location = Qnil;
value = spec;
}
/* After this point, VALUE is the property after any
margin prefix has been stripped. It must be a string,
an image specification, or `(space ...)'.
LOCATION specifies where to display: `left-margin',
`right-margin' or nil. */
valid_p = (STRINGP (value)
#ifdef HAVE_WINDOW_SYSTEM
|| (FRAME_WINDOW_P (it->f) && valid_image_p (value))
#endif /* not HAVE_WINDOW_SYSTEM */
|| (CONSP (value) && EQ (XCAR (value), Qspace)));
if (valid_p && !display_replaced_before_p)
{
/* Save current settings of IT so that we can restore them
when we are finished with the glyph property value. */
save_pos = it->position;
it->position = *position;
push_it (it);
it->position = save_pos;
it->from_overlay = overlay;
if (NILP (location))
it->area = TEXT_AREA;
else if (EQ (location, Qleft_margin))
it->area = LEFT_MARGIN_AREA;
else
it->area = RIGHT_MARGIN_AREA;
if (STRINGP (value))
{
it->string = value;
it->multibyte_p = STRING_MULTIBYTE (it->string);
it->current.overlay_string_index = -1;
IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = 0;
it->end_charpos = it->string_nchars = SCHARS (it->string);
it->method = GET_FROM_STRING;
it->stop_charpos = 0;
it->string_from_display_prop_p = 1;
/* Say that we haven't consumed the characters with
`display' property yet. The call to pop_it in
set_iterator_to_next will clean this up. */
if (BUFFERP (object))
*position = start_pos;
}
else if (CONSP (value) && EQ (XCAR (value), Qspace))
{
it->method = GET_FROM_STRETCH;
it->object = value;
*position = it->position = start_pos;
}
#ifdef HAVE_WINDOW_SYSTEM
else
{
it->what = IT_IMAGE;
it->image_id = lookup_image (it->f, value);
it->position = start_pos;
it->object = NILP (object) ? it->w->buffer : object;
it->method = GET_FROM_IMAGE;
/* Say that we haven't consumed the characters with
`display' property yet. The call to pop_it in
set_iterator_to_next will clean this up. */
*position = start_pos;
}
#endif /* HAVE_WINDOW_SYSTEM */
return 1;
}
/* Invalid property or property not supported. Restore
POSITION to what it was before. */
*position = start_pos;
return 0;
}
/* Check if SPEC is a display sub-property value whose text should be
treated as intangible. */
static int
single_display_spec_intangible_p (prop)
Lisp_Object prop;
{
/* Skip over `when FORM'. */
if (CONSP (prop) && EQ (XCAR (prop), Qwhen))
{
prop = XCDR (prop);
if (!CONSP (prop))
return 0;
prop = XCDR (prop);
}
if (STRINGP (prop))
return 1;
if (!CONSP (prop))
return 0;
/* Skip over `margin LOCATION'. If LOCATION is in the margins,
we don't need to treat text as intangible. */
if (EQ (XCAR (prop), Qmargin))
{
prop = XCDR (prop);
if (!CONSP (prop))
return 0;
prop = XCDR (prop);
if (!CONSP (prop)
|| EQ (XCAR (prop), Qleft_margin)
|| EQ (XCAR (prop), Qright_margin))
return 0;
}
return (CONSP (prop)
&& (EQ (XCAR (prop), Qimage)
|| EQ (XCAR (prop), Qspace)));
}
/* Check if PROP is a display property value whose text should be
treated as intangible. */
int
display_prop_intangible_p (prop)
Lisp_Object prop;
{
if (CONSP (prop)
&& CONSP (XCAR (prop))
&& !EQ (Qmargin, XCAR (XCAR (prop))))
{
/* A list of sub-properties. */
while (CONSP (prop))
{
if (single_display_spec_intangible_p (XCAR (prop)))
return 1;
prop = XCDR (prop);
}
}
else if (VECTORP (prop))
{
/* A vector of sub-properties. */
int i;
for (i = 0; i < ASIZE (prop); ++i)
if (single_display_spec_intangible_p (AREF (prop, i)))
return 1;
}
else
return single_display_spec_intangible_p (prop);
return 0;
}
/* Return 1 if PROP is a display sub-property value containing STRING. */
static int
single_display_spec_string_p (prop, string)
Lisp_Object prop, string;
{
if (EQ (string, prop))
return 1;
/* Skip over `when FORM'. */
if (CONSP (prop) && EQ (XCAR (prop), Qwhen))
{
prop = XCDR (prop);
if (!CONSP (prop))
return 0;
prop = XCDR (prop);
}
if (CONSP (prop))
/* Skip over `margin LOCATION'. */
if (EQ (XCAR (prop), Qmargin))
{
prop = XCDR (prop);
if (!CONSP (prop))
return 0;
prop = XCDR (prop);
if (!CONSP (prop))
return 0;
}
return CONSP (prop) && EQ (XCAR (prop), string);
}
/* Return 1 if STRING appears in the `display' property PROP. */
static int
display_prop_string_p (prop, string)
Lisp_Object prop, string;
{
if (CONSP (prop)
&& CONSP (XCAR (prop))
&& !EQ (Qmargin, XCAR (XCAR (prop))))
{
/* A list of sub-properties. */
while (CONSP (prop))
{
if (single_display_spec_string_p (XCAR (prop), string))
return 1;
prop = XCDR (prop);
}
}
else if (VECTORP (prop))
{
/* A vector of sub-properties. */
int i;
for (i = 0; i < ASIZE (prop); ++i)
if (single_display_spec_string_p (AREF (prop, i), string))
return 1;
}
else
return single_display_spec_string_p (prop, string);
return 0;
}
/* Determine which buffer position in W's buffer STRING comes from.
AROUND_CHARPOS is an approximate position where it could come from.
Value is the buffer position or 0 if it couldn't be determined.
W's buffer must be current.
This function is necessary because we don't record buffer positions
in glyphs generated from strings (to keep struct glyph small).
This function may only use code that doesn't eval because it is
called asynchronously from note_mouse_highlight. */
int
string_buffer_position (w, string, around_charpos)
struct window *w;
Lisp_Object string;
int around_charpos;
{
Lisp_Object limit, prop, pos;
const int MAX_DISTANCE = 1000;
int found = 0;
pos = make_number (around_charpos);
limit = make_number (min (XINT (pos) + MAX_DISTANCE, ZV));
while (!found && !EQ (pos, limit))
{
prop = Fget_char_property (pos, Qdisplay, Qnil);
if (!NILP (prop) && display_prop_string_p (prop, string))
found = 1;
else
pos = Fnext_single_char_property_change (pos, Qdisplay, Qnil, limit);
}
if (!found)
{
pos = make_number (around_charpos);
limit = make_number (max (XINT (pos) - MAX_DISTANCE, BEGV));
while (!found && !EQ (pos, limit))
{
prop = Fget_char_property (pos, Qdisplay, Qnil);
if (!NILP (prop) && display_prop_string_p (prop, string))
found = 1;
else
pos = Fprevious_single_char_property_change (pos, Qdisplay, Qnil,
limit);
}
}
return found ? XINT (pos) : 0;
}
/***********************************************************************
`composition' property
***********************************************************************/
/* Set up iterator IT from `composition' property at its current
position. Called from handle_stop. */
static enum prop_handled
handle_composition_prop (it)
struct it *it;
{
Lisp_Object prop, string;
EMACS_INT pos, pos_byte, start, end;
if (STRINGP (it->string))
{
unsigned char *s;
pos = IT_STRING_CHARPOS (*it);
pos_byte = IT_STRING_BYTEPOS (*it);
string = it->string;
s = SDATA (string) + pos_byte;
it->c = STRING_CHAR (s);
}
else
{
pos = IT_CHARPOS (*it);
pos_byte = IT_BYTEPOS (*it);
string = Qnil;
it->c = FETCH_CHAR (pos_byte);
}
/* If there's a valid composition and point is not inside of the
composition (in the case that the composition is from the current
buffer), draw a glyph composed from the composition components. */
if (find_composition (pos, -1, &start, &end, &prop, string)
&& COMPOSITION_VALID_P (start, end, prop)
&& (STRINGP (it->string) || (PT <= start || PT >= end)))
{
if (start != pos)
{
if (STRINGP (it->string))
pos_byte = string_char_to_byte (it->string, start);
else
pos_byte = CHAR_TO_BYTE (start);
}
it->cmp_it.id = get_composition_id (start, pos_byte, end - start,
prop, string);
if (it->cmp_it.id >= 0)
{
it->cmp_it.ch = -1;
it->cmp_it.nchars = COMPOSITION_LENGTH (prop);
it->cmp_it.nglyphs = -1;
}
}
return HANDLED_NORMALLY;
}
/***********************************************************************
Overlay strings
***********************************************************************/
/* The following structure is used to record overlay strings for
later sorting in load_overlay_strings. */
struct overlay_entry
{
Lisp_Object overlay;
Lisp_Object string;
int priority;
int after_string_p;
};
/* Set up iterator IT from overlay strings at its current position.
Called from handle_stop. */
static enum prop_handled
handle_overlay_change (it)
struct it *it;
{
if (!STRINGP (it->string) && get_overlay_strings (it, 0))
return HANDLED_RECOMPUTE_PROPS;
else
return HANDLED_NORMALLY;
}
/* Set up the next overlay string for delivery by IT, if there is an
overlay string to deliver. Called by set_iterator_to_next when the
end of the current overlay string is reached. If there are more
overlay strings to display, IT->string and
IT->current.overlay_string_index are set appropriately here.
Otherwise IT->string is set to nil. */
static void
next_overlay_string (it)
struct it *it;
{
++it->current.overlay_string_index;
if (it->current.overlay_string_index == it->n_overlay_strings)
{
/* No more overlay strings. Restore IT's settings to what
they were before overlay strings were processed, and
continue to deliver from current_buffer. */
it->ellipsis_p = (it->stack[it->sp - 1].display_ellipsis_p != 0);
pop_it (it);
xassert (it->sp > 0
|| (NILP (it->string)
&& it->method == GET_FROM_BUFFER
&& it->stop_charpos >= BEGV
&& it->stop_charpos <= it->end_charpos));
it->current.overlay_string_index = -1;
it->n_overlay_strings = 0;
/* If we're at the end of the buffer, record that we have
processed the overlay strings there already, so that
next_element_from_buffer doesn't try it again. */
if (NILP (it->string) && IT_CHARPOS (*it) >= it->end_charpos)
it->overlay_strings_at_end_processed_p = 1;
}
else
{
/* There are more overlay strings to process. If
IT->current.overlay_string_index has advanced to a position
where we must load IT->overlay_strings with more strings, do
it. */
int i = it->current.overlay_string_index % OVERLAY_STRING_CHUNK_SIZE;
if (it->current.overlay_string_index && i == 0)
load_overlay_strings (it, 0);
/* Initialize IT to deliver display elements from the overlay
string. */
it->string = it->overlay_strings[i];
it->multibyte_p = STRING_MULTIBYTE (it->string);
SET_TEXT_POS (it->current.string_pos, 0, 0);
it->method = GET_FROM_STRING;
it->stop_charpos = 0;
if (it->cmp_it.stop_pos >= 0)
it->cmp_it.stop_pos = 0;
}
CHECK_IT (it);
}
/* Compare two overlay_entry structures E1 and E2. Used as a
comparison function for qsort in load_overlay_strings. Overlay
strings for the same position are sorted so that
1. All after-strings come in front of before-strings, except
when they come from the same overlay.
2. Within after-strings, strings are sorted so that overlay strings
from overlays with higher priorities come first.
2. Within before-strings, strings are sorted so that overlay
strings from overlays with higher priorities come last.
Value is analogous to strcmp. */
static int
compare_overlay_entries (e1, e2)
void *e1, *e2;
{
struct overlay_entry *entry1 = (struct overlay_entry *) e1;
struct overlay_entry *entry2 = (struct overlay_entry *) e2;
int result;
if (entry1->after_string_p != entry2->after_string_p)
{
/* Let after-strings appear in front of before-strings if
they come from different overlays. */
if (EQ (entry1->overlay, entry2->overlay))
result = entry1->after_string_p ? 1 : -1;
else
result = entry1->after_string_p ? -1 : 1;
}
else if (entry1->after_string_p)
/* After-strings sorted in order of decreasing priority. */
result = entry2->priority - entry1->priority;
else
/* Before-strings sorted in order of increasing priority. */
result = entry1->priority - entry2->priority;
return result;
}
/* Load the vector IT->overlay_strings with overlay strings from IT's
current buffer position, or from CHARPOS if that is > 0. Set
IT->n_overlays to the total number of overlay strings found.
Overlay strings are processed OVERLAY_STRING_CHUNK_SIZE strings at
a time. On entry into load_overlay_strings,
IT->current.overlay_string_index gives the number of overlay
strings that have already been loaded by previous calls to this
function.
IT->add_overlay_start contains an additional overlay start
position to consider for taking overlay strings from, if non-zero.
This position comes into play when the overlay has an `invisible'
property, and both before and after-strings. When we've skipped to
the end of the overlay, because of its `invisible' property, we
nevertheless want its before-string to appear.
IT->add_overlay_start will contain the overlay start position
in this case.
Overlay strings are sorted so that after-string strings come in
front of before-string strings. Within before and after-strings,
strings are sorted by overlay priority. See also function
compare_overlay_entries. */
static void
load_overlay_strings (it, charpos)
struct it *it;
int charpos;
{
extern Lisp_Object Qwindow, Qpriority;
Lisp_Object overlay, window, str, invisible;
struct Lisp_Overlay *ov;
int start, end;
int size = 20;
int n = 0, i, j, invis_p;
struct overlay_entry *entries
= (struct overlay_entry *) alloca (size * sizeof *entries);
if (charpos <= 0)
charpos = IT_CHARPOS (*it);
/* Append the overlay string STRING of overlay OVERLAY to vector
`entries' which has size `size' and currently contains `n'
elements. AFTER_P non-zero means STRING is an after-string of
OVERLAY. */
#define RECORD_OVERLAY_STRING(OVERLAY, STRING, AFTER_P) \
do \
{ \
Lisp_Object priority; \
\
if (n == size) \
{ \
int new_size = 2 * size; \
struct overlay_entry *old = entries; \
entries = \
(struct overlay_entry *) alloca (new_size \
* sizeof *entries); \
bcopy (old, entries, size * sizeof *entries); \
size = new_size; \
} \
\
entries[n].string = (STRING); \
entries[n].overlay = (OVERLAY); \
priority = Foverlay_get ((OVERLAY), Qpriority); \
entries[n].priority = INTEGERP (priority) ? XINT (priority) : 0; \
entries[n].after_string_p = (AFTER_P); \
++n; \
} \
while (0)
/* Process overlay before the overlay center. */
for (ov = current_buffer->overlays_before; ov; ov = ov->next)
{
XSETMISC (overlay, ov);
xassert (OVERLAYP (overlay));
start = OVERLAY_POSITION (OVERLAY_START (overlay));
end = OVERLAY_POSITION (OVERLAY_END (overlay));
if (end < charpos)
break;
/* Skip this overlay if it doesn't start or end at IT's current
position. */
if (end != charpos && start != charpos)
continue;
/* Skip this overlay if it doesn't apply to IT->w. */
window = Foverlay_get (overlay, Qwindow);
if (WINDOWP (window) && XWINDOW (window) != it->w)
continue;
/* If the text ``under'' the overlay is invisible, both before-
and after-strings from this overlay are visible; start and
end position are indistinguishable. */
invisible = Foverlay_get (overlay, Qinvisible);
invis_p = TEXT_PROP_MEANS_INVISIBLE (invisible);
/* If overlay has a non-empty before-string, record it. */
if ((start == charpos || (end == charpos && invis_p))
&& (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str))
&& SCHARS (str))
RECORD_OVERLAY_STRING (overlay, str, 0);
/* If overlay has a non-empty after-string, record it. */
if ((end == charpos || (start == charpos && invis_p))
&& (str = Foverlay_get (overlay, Qafter_string), STRINGP (str))
&& SCHARS (str))
RECORD_OVERLAY_STRING (overlay, str, 1);
}
/* Process overlays after the overlay center. */
for (ov = current_buffer->overlays_after; ov; ov = ov->next)
{
XSETMISC (overlay, ov);
xassert (OVERLAYP (overlay));
start = OVERLAY_POSITION (OVERLAY_START (overlay));
end = OVERLAY_POSITION (OVERLAY_END (overlay));
if (start > charpos)
break;
/* Skip this overlay if it doesn't start or end at IT's current
position. */
if (end != charpos && start != charpos)
continue;
/* Skip this overlay if it doesn't apply to IT->w. */
window = Foverlay_get (overlay, Qwindow);
if (WINDOWP (window) && XWINDOW (window) != it->w)
continue;
/* If the text ``under'' the overlay is invisible, it has a zero
dimension, and both before- and after-strings apply. */
invisible = Foverlay_get (overlay, Qinvisible);
invis_p = TEXT_PROP_MEANS_INVISIBLE (invisible);
/* If overlay has a non-empty before-string, record it. */
if ((start == charpos || (end == charpos && invis_p))
&& (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str))
&& SCHARS (str))
RECORD_OVERLAY_STRING (overlay, str, 0);
/* If overlay has a non-empty after-string, record it. */
if ((end == charpos || (start == charpos && invis_p))
&& (str = Foverlay_get (overlay, Qafter_string), STRINGP (str))
&& SCHARS (str))
RECORD_OVERLAY_STRING (overlay, str, 1);
}
#undef RECORD_OVERLAY_STRING
/* Sort entries. */
if (n > 1)
qsort (entries, n, sizeof *entries, compare_overlay_entries);
/* Record the total number of strings to process. */
it->n_overlay_strings = n;
/* IT->current.overlay_string_index is the number of overlay strings
that have already been consumed by IT. Copy some of the
remaining overlay strings to IT->overlay_strings. */
i = 0;
j = it->current.overlay_string_index;
while (i < OVERLAY_STRING_CHUNK_SIZE && j < n)
{
it->overlay_strings[i] = entries[j].string;
it->string_overlays[i++] = entries[j++].overlay;
}
CHECK_IT (it);
}
/* Get the first chunk of overlay strings at IT's current buffer
position, or at CHARPOS if that is > 0. Value is non-zero if at
least one overlay string was found. */
static int
get_overlay_strings_1 (it, charpos, compute_stop_p)
struct it *it;
int charpos;
int compute_stop_p;
{
/* Get the first OVERLAY_STRING_CHUNK_SIZE overlay strings to
process. This fills IT->overlay_strings with strings, and sets
IT->n_overlay_strings to the total number of strings to process.
IT->pos.overlay_string_index has to be set temporarily to zero
because load_overlay_strings needs this; it must be set to -1
when no overlay strings are found because a zero value would
indicate a position in the first overlay string. */
it->current.overlay_string_index = 0;
load_overlay_strings (it, charpos);
/* If we found overlay strings, set up IT to deliver display
elements from the first one. Otherwise set up IT to deliver
from current_buffer. */
if (it->n_overlay_strings)
{
/* Make sure we know settings in current_buffer, so that we can
restore meaningful values when we're done with the overlay
strings. */
if (compute_stop_p)
compute_stop_pos (it);
xassert (it->face_id >= 0);
/* Save IT's settings. They are restored after all overlay
strings have been processed. */
xassert (!compute_stop_p || it->sp == 0);
/* When called from handle_stop, there might be an empty display
string loaded. In that case, don't bother saving it. */
if (!STRINGP (it->string) || SCHARS (it->string))
push_it (it);
/* Set up IT to deliver display elements from the first overlay
string. */
IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = 0;
it->string = it->overlay_strings[0];
it->from_overlay = Qnil;
it->stop_charpos = 0;
xassert (STRINGP (it->string));
it->end_charpos = SCHARS (it->string);
it->multibyte_p = STRING_MULTIBYTE (it->string);
it->method = GET_FROM_STRING;
return 1;
}
it->current.overlay_string_index = -1;
return 0;
}
static int
get_overlay_strings (it, charpos)
struct it *it;
int charpos;
{
it->string = Qnil;
it->method = GET_FROM_BUFFER;
(void) get_overlay_strings_1 (it, charpos, 1);
CHECK_IT (it);
/* Value is non-zero if we found at least one overlay string. */
return STRINGP (it->string);
}
/***********************************************************************
Saving and restoring state
***********************************************************************/
/* Save current settings of IT on IT->stack. Called, for example,
before setting up IT for an overlay string, to be able to restore
IT's settings to what they were after the overlay string has been
processed. */
static void
push_it (it)
struct it *it;
{
struct iterator_stack_entry *p;
xassert (it->sp < IT_STACK_SIZE);
p = it->stack + it->sp;
p->stop_charpos = it->stop_charpos;
p->cmp_it = it->cmp_it;
xassert (it->face_id >= 0);
p->face_id = it->face_id;
p->string = it->string;
p->method = it->method;
p->from_overlay = it->from_overlay;
switch (p->method)
{
case GET_FROM_IMAGE:
p->u.image.object = it->object;
p->u.image.image_id = it->image_id;
p->u.image.slice = it->slice;
break;
case GET_FROM_STRETCH:
p->u.stretch.object = it->object;
break;
}
p->position = it->position;
p->current = it->current;
p->end_charpos = it->end_charpos;
p->string_nchars = it->string_nchars;
p->area = it->area;
p->multibyte_p = it->multibyte_p;
p->avoid_cursor_p = it->avoid_cursor_p;
p->space_width = it->space_width;
p->font_height = it->font_height;
p->voffset = it->voffset;
p->string_from_display_prop_p = it->string_from_display_prop_p;
p->display_ellipsis_p = 0;
p->line_wrap = it->line_wrap;
++it->sp;
}
/* Restore IT's settings from IT->stack. Called, for example, when no
more overlay strings must be processed, and we return to delivering
display elements from a buffer, or when the end of a string from a
`display' property is reached and we return to delivering display
elements from an overlay string, or from a buffer. */
static void
pop_it (it)
struct it *it;
{
struct iterator_stack_entry *p;
xassert (it->sp > 0);
--it->sp;
p = it->stack + it->sp;
it->stop_charpos = p->stop_charpos;
it->cmp_it = p->cmp_it;
it->face_id = p->face_id;
it->current = p->current;
it->position = p->position;
it->string = p->string;
it->from_overlay = p->from_overlay;
if (NILP (it->string))
SET_TEXT_POS (it->current.string_pos, -1, -1);
it->method = p->method;
switch (it->method)
{
case GET_FROM_IMAGE:
it->image_id = p->u.image.image_id;
it->object = p->u.image.object;
it->slice = p->u.image.slice;
break;
case GET_FROM_STRETCH:
it->object = p->u.comp.object;
break;
case GET_FROM_BUFFER:
it->object = it->w->buffer;
break;
case GET_FROM_STRING:
it->object = it->string;
break;
case GET_FROM_DISPLAY_VECTOR:
if (it->s)
it->method = GET_FROM_C_STRING;
else if (STRINGP (it->string))
it->method = GET_FROM_STRING;
else
{
it->method = GET_FROM_BUFFER;
it->object = it->w->buffer;
}
}
it->end_charpos = p->end_charpos;
it->string_nchars = p->string_nchars;
it->area = p->area;
it->multibyte_p = p->multibyte_p;
it->avoid_cursor_p = p->avoid_cursor_p;
it->space_width = p->space_width;
it->font_height = p->font_height;
it->voffset = p->voffset;
it->string_from_display_prop_p = p->string_from_display_prop_p;
it->line_wrap = p->line_wrap;
}
/***********************************************************************
Moving over lines
***********************************************************************/
/* Set IT's current position to the previous line start. */
static void
back_to_previous_line_start (it)
struct it *it;
{
IT_CHARPOS (*it) = find_next_newline_no_quit (IT_CHARPOS (*it) - 1, -1);
IT_BYTEPOS (*it) = CHAR_TO_BYTE (IT_CHARPOS (*it));
}
/* Move IT to the next line start.
Value is non-zero if a newline was found. Set *SKIPPED_P to 1 if
we skipped over part of the text (as opposed to moving the iterator
continuously over the text). Otherwise, don't change the value
of *SKIPPED_P.
Newlines may come from buffer text, overlay strings, or strings
displayed via the `display' property. That's the reason we can't
simply use find_next_newline_no_quit.
Note that this function may not skip over invisible text that is so
because of text properties and immediately follows a newline. If
it would, function reseat_at_next_visible_line_start, when called
from set_iterator_to_next, would effectively make invisible
characters following a newline part of the wrong glyph row, which
leads to wrong cursor motion. */
static int
forward_to_next_line_start (it, skipped_p)
struct it *it;
int *skipped_p;
{
int old_selective, newline_found_p, n;
const int MAX_NEWLINE_DISTANCE = 500;
/* If already on a newline, just consume it to avoid unintended
skipping over invisible text below. */
if (it->what == IT_CHARACTER
&& it->c == '\n'
&& CHARPOS (it->position) == IT_CHARPOS (*it))
{
set_iterator_to_next (it, 0);
it->c = 0;
return 1;
}
/* Don't handle selective display in the following. It's (a)
unnecessary because it's done by the caller, and (b) leads to an
infinite recursion because next_element_from_ellipsis indirectly
calls this function. */
old_selective = it->selective;
it->selective = 0;
/* Scan for a newline within MAX_NEWLINE_DISTANCE display elements
from buffer text. */
for (n = newline_found_p = 0;
!newline_found_p && n < MAX_NEWLINE_DISTANCE;
n += STRINGP (it->string) ? 0 : 1)
{
if (!get_next_display_element (it))
return 0;
newline_found_p = it->what == IT_CHARACTER && it->c == '\n';
set_iterator_to_next (it, 0);
}
/* If we didn't find a newline near enough, see if we can use a
short-cut. */
if (!newline_found_p)
{
int start = IT_CHARPOS (*it);
int limit = find_next_newline_no_quit (start, 1);
Lisp_Object pos;
xassert (!STRINGP (it->string));
/* If there isn't any `display' property in sight, and no
overlays, we can just use the position of the newline in
buffer text. */
if (it->stop_charpos >= limit
|| ((pos = Fnext_single_property_change (make_number (start),
Qdisplay,
Qnil, make_number (limit)),
NILP (pos))
&& next_overlay_change (start) == ZV))
{
IT_CHARPOS (*it) = limit;
IT_BYTEPOS (*it) = CHAR_TO_BYTE (limit);
*skipped_p = newline_found_p = 1;
}
else
{
while (get_next_display_element (it)
&& !newline_found_p)
{
newline_found_p = ITERATOR_AT_END_OF_LINE_P (it);
set_iterator_to_next (it, 0);
}
}
}
it->selective = old_selective;
return newline_found_p;
}
/* Set IT's current position to the previous visible line start. Skip
invisible text that is so either due to text properties or due to
selective display. Caution: this does not change IT->current_x and
IT->hpos. */
static void
back_to_previous_visible_line_start (it)
struct it *it;
{
while (IT_CHARPOS (*it) > BEGV)
{
back_to_previous_line_start (it);
if (IT_CHARPOS (*it) <= BEGV)
break;
/* If selective > 0, then lines indented more than that values
are invisible. */
if (it->selective > 0
&& indented_beyond_p (IT_CHARPOS (*it), IT_BYTEPOS (*it),
(double) it->selective)) /* iftc */
continue;
/* Check the newline before point for invisibility. */
{
Lisp_Object prop;
prop = Fget_char_property (make_number (IT_CHARPOS (*it) - 1),
Qinvisible, it->window);
if (TEXT_PROP_MEANS_INVISIBLE (prop))
continue;
}
if (IT_CHARPOS (*it) <= BEGV)
break;
{
struct it it2;
int pos;
EMACS_INT beg, end;
Lisp_Object val, overlay;
/* If newline is part of a composition, continue from start of composition */
if (find_composition (IT_CHARPOS (*it), -1, &beg, &end, &val, Qnil)
&& beg < IT_CHARPOS (*it))
goto replaced;
/* If newline is replaced by a display property, find start of overlay
or interval and continue search from that point. */
it2 = *it;
pos = --IT_CHARPOS (it2);
--IT_BYTEPOS (it2);
it2.sp = 0;
it2.string_from_display_prop_p = 0;
if (handle_display_prop (&it2) == HANDLED_RETURN
&& !NILP (val = get_char_property_and_overlay
(make_number (pos), Qdisplay, Qnil, &overlay))
&& (OVERLAYP (overlay)
? (beg = OVERLAY_POSITION (OVERLAY_START (overlay)))
: get_property_and_range (pos, Qdisplay, &val, &beg, &end, Qnil)))
goto replaced;
/* Newline is not replaced by anything -- so we are done. */
break;
replaced:
if (beg < BEGV)
beg = BEGV;
IT_CHARPOS (*it) = beg;
IT_BYTEPOS (*it) = buf_charpos_to_bytepos (current_buffer, beg);
}
}
it->continuation_lines_width = 0;
xassert (IT_CHARPOS (*it) >= BEGV);
xassert (IT_CHARPOS (*it) == BEGV
|| FETCH_BYTE (IT_BYTEPOS (*it) - 1) == '\n');
CHECK_IT (it);
}
/* Reseat iterator IT at the previous visible line start. Skip
invisible text that is so either due to text properties or due to
selective display. At the end, update IT's overlay information,
face information etc. */
void
reseat_at_previous_visible_line_start (it)
struct it *it;
{
back_to_previous_visible_line_start (it);
reseat (it, it->current.pos, 1);
CHECK_IT (it);
}
/* Reseat iterator IT on the next visible line start in the current
buffer. ON_NEWLINE_P non-zero means position IT on the newline
preceding the line start. Skip over invisible text that is so
because of selective display. Compute faces, overlays etc at the
new position. Note that this function does not skip over text that
is invisible because of text properties. */
static void
reseat_at_next_visible_line_start (it, on_newline_p)
struct it *it;
int on_newline_p;
{
int newline_found_p, skipped_p = 0;
newline_found_p = forward_to_next_line_start (it, &skipped_p);
/* Skip over lines that are invisible because they are indented
more than the value of IT->selective. */
if (it->selective > 0)
while (IT_CHARPOS (*it) < ZV
&& indented_beyond_p (IT_CHARPOS (*it), IT_BYTEPOS (*it),
(double) it->selective)) /* iftc */
{
xassert (IT_BYTEPOS (*it) == BEGV
|| FETCH_BYTE (IT_BYTEPOS (*it) - 1) == '\n');
newline_found_p = forward_to_next_line_start (it, &skipped_p);
}
/* Position on the newline if that's what's requested. */
if (on_newline_p && newline_found_p)
{
if (STRINGP (it->string))
{
if (IT_STRING_CHARPOS (*it) > 0)
{
--IT_STRING_CHARPOS (*it);
--IT_STRING_BYTEPOS (*it);
}
}
else if (IT_CHARPOS (*it) > BEGV)
{
--IT_CHARPOS (*it);
--IT_BYTEPOS (*it);
reseat (it, it->current.pos, 0);
}
}
else if (skipped_p)
reseat (it, it->current.pos, 0);
CHECK_IT (it);
}
/***********************************************************************
Changing an iterator's position
***********************************************************************/
/* Change IT's current position to POS in current_buffer. If FORCE_P
is non-zero, always check for text properties at the new position.
Otherwise, text properties are only looked up if POS >=
IT->check_charpos of a property. */
static void
reseat (it, pos, force_p)
struct it *it;
struct text_pos pos;
int force_p;
{
int original_pos = IT_CHARPOS (*it);
reseat_1 (it, pos, 0);
/* Determine where to check text properties. Avoid doing it
where possible because text property lookup is very expensive. */
if (force_p
|| CHARPOS (pos) > it->stop_charpos
|| CHARPOS (pos) < original_pos)
handle_stop (it);
CHECK_IT (it);
}
/* Change IT's buffer position to POS. SET_STOP_P non-zero means set
IT->stop_pos to POS, also. */
static void
reseat_1 (it, pos, set_stop_p)
struct it *it;
struct text_pos pos;
int set_stop_p;
{
/* Don't call this function when scanning a C string. */
xassert (it->s == NULL);
/* POS must be a reasonable value. */
xassert (CHARPOS (pos) >= BEGV && CHARPOS (pos) <= ZV);
it->current.pos = it->position = pos;
it->end_charpos = ZV;
it->dpvec = NULL;
it->current.dpvec_index = -1;
it->current.overlay_string_index = -1;
IT_STRING_CHARPOS (*it) = -1;
IT_STRING_BYTEPOS (*it) = -1;
it->string = Qnil;
it->string_from_display_prop_p = 0;
it->method = GET_FROM_BUFFER;
it->object = it->w->buffer;
it->area = TEXT_AREA;
it->multibyte_p = !NILP (current_buffer->enable_multibyte_characters);
it->sp = 0;
it->string_from_display_prop_p = 0;
it->face_before_selective_p = 0;
if (set_stop_p)
it->stop_charpos = CHARPOS (pos);
}
/* Set up IT for displaying a string, starting at CHARPOS in window W.
If S is non-null, it is a C string to iterate over. Otherwise,
STRING gives a Lisp string to iterate over.
If PRECISION > 0, don't return more then PRECISION number of
characters from the string.
If FIELD_WIDTH > 0, return padding spaces until FIELD_WIDTH
characters have been returned. FIELD_WIDTH < 0 means an infinite
field width.
MULTIBYTE = 0 means disable processing of multibyte characters,
MULTIBYTE > 0 means enable it,
MULTIBYTE < 0 means use IT->multibyte_p.
IT must be initialized via a prior call to init_iterator before
calling this function. */
static void
reseat_to_string (it, s, string, charpos, precision, field_width, multibyte)
struct it *it;
unsigned char *s;
Lisp_Object string;
int charpos;
int precision, field_width, multibyte;
{
/* No region in strings. */
it->region_beg_charpos = it->region_end_charpos = -1;
/* No text property checks performed by default, but see below. */
it->stop_charpos = -1;
/* Set iterator position and end position. */
bzero (&it->current, sizeof it->current);
it->current.overlay_string_index = -1;
it->current.dpvec_index = -1;
xassert (charpos >= 0);
/* If STRING is specified, use its multibyteness, otherwise use the
setting of MULTIBYTE, if specified. */
if (multibyte >= 0)
it->multibyte_p = multibyte > 0;
if (s == NULL)
{
xassert (STRINGP (string));
it->string = string;
it->s = NULL;
it->end_charpos = it->string_nchars = SCHARS (string);
it->method = GET_FROM_STRING;
it->current.string_pos = string_pos (charpos, string);
}
else
{
it->s = s;
it->string = Qnil;
/* Note that we use IT->current.pos, not it->current.string_pos,
for displaying C strings. */
IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = -1;
if (it->multibyte_p)
{
it->current.pos = c_string_pos (charpos, s, 1);
it->end_charpos = it->string_nchars = number_of_chars (s, 1);
}
else
{
IT_CHARPOS (*it) = IT_BYTEPOS (*it) = charpos;
it->end_charpos = it->string_nchars = strlen (s);
}
it->method = GET_FROM_C_STRING;
}
/* PRECISION > 0 means don't return more than PRECISION characters
from the string. */
if (precision > 0 && it->end_charpos - charpos > precision)
it->end_charpos = it->string_nchars = charpos + precision;
/* FIELD_WIDTH > 0 means pad with spaces until FIELD_WIDTH
characters have been returned. FIELD_WIDTH == 0 means don't pad,
FIELD_WIDTH < 0 means infinite field width. This is useful for
padding with `-' at the end of a mode line. */
if (field_width < 0)
field_width = INFINITY;
if (field_width > it->end_charpos - charpos)
it->end_charpos = charpos + field_width;
/* Use the standard display table for displaying strings. */
if (DISP_TABLE_P (Vstandard_display_table))
it->dp = XCHAR_TABLE (Vstandard_display_table);
it->stop_charpos = charpos;
if (s == NULL && it->multibyte_p)
{
EMACS_INT endpos = SCHARS (it->string);
if (endpos > it->end_charpos)
endpos = it->end_charpos;
composition_compute_stop_pos (&it->cmp_it, charpos, -1, endpos,
it->string);
}
CHECK_IT (it);
}
/***********************************************************************
Iteration
***********************************************************************/
/* Map enum it_method value to corresponding next_element_from_* function. */
static int (* get_next_element[NUM_IT_METHODS]) P_ ((struct it *it)) =
{
next_element_from_buffer,
next_element_from_display_vector,
next_element_from_string,
next_element_from_c_string,
next_element_from_image,
next_element_from_stretch
};
#define GET_NEXT_DISPLAY_ELEMENT(it) (*get_next_element[(it)->method]) (it)
/* Return 1 iff a character at CHARPOS (and BYTEPOS) is composed
(possibly with the following characters). */
#define CHAR_COMPOSED_P(IT,CHARPOS,BYTEPOS,END_CHARPOS) \
((IT)->cmp_it.id >= 0 \
|| ((IT)->cmp_it.stop_pos == (CHARPOS) \
&& composition_reseat_it (&(IT)->cmp_it, CHARPOS, BYTEPOS, \
END_CHARPOS, (IT)->w, \
FACE_FROM_ID ((IT)->f, (IT)->face_id), \
(IT)->string)))
/* Load IT's display element fields with information about the next
display element from the current position of IT. Value is zero if
end of buffer (or C string) is reached. */
static struct frame *last_escape_glyph_frame = NULL;
static unsigned last_escape_glyph_face_id = (1 << FACE_ID_BITS);
static int last_escape_glyph_merged_face_id = 0;
int
get_next_display_element (it)
struct it *it;
{
/* Non-zero means that we found a display element. Zero means that
we hit the end of what we iterate over. Performance note: the
function pointer `method' used here turns out to be faster than
using a sequence of if-statements. */
int success_p;
get_next:
success_p = GET_NEXT_DISPLAY_ELEMENT (it);
if (it->what == IT_CHARACTER)
{
/* Map via display table or translate control characters.
IT->c, IT->len etc. have been set to the next character by
the function call above. If we have a display table, and it
contains an entry for IT->c, translate it. Don't do this if
IT->c itself comes from a display table, otherwise we could
end up in an infinite recursion. (An alternative could be to
count the recursion depth of this function and signal an
error when a certain maximum depth is reached.) Is it worth
it? */
if (success_p && it->dpvec == NULL)
{
Lisp_Object dv;
struct charset *unibyte = CHARSET_FROM_ID (charset_unibyte);
enum { char_is_other = 0, char_is_nbsp, char_is_soft_hyphen }
nbsp_or_shy = char_is_other;
int decoded = it->c;
if (it->dp
&& (dv = DISP_CHAR_VECTOR (it->dp, it->c),
VECTORP (dv)))
{
struct Lisp_Vector *v = XVECTOR (dv);
/* Return the first character from the display table
entry, if not empty. If empty, don't display the
current character. */
if (v->size)
{
it->dpvec_char_len = it->len;
it->dpvec = v->contents;
it->dpend = v->contents + v->size;
it->current.dpvec_index = 0;
it->dpvec_face_id = -1;
it->saved_face_id = it->face_id;
it->method = GET_FROM_DISPLAY_VECTOR;
it->ellipsis_p = 0;
}
else
{
set_iterator_to_next (it, 0);
}
goto get_next;
}
if (unibyte_display_via_language_environment
&& !ASCII_CHAR_P (it->c))
decoded = DECODE_CHAR (unibyte, it->c);
if (it->c >= 0x80 && ! NILP (Vnobreak_char_display))
{
if (it->multibyte_p)
nbsp_or_shy = (it->c == 0xA0 ? char_is_nbsp
: it->c == 0xAD ? char_is_soft_hyphen
: char_is_other);
else if (unibyte_display_via_language_environment)
nbsp_or_shy = (decoded == 0xA0 ? char_is_nbsp
: decoded == 0xAD ? char_is_soft_hyphen
: char_is_other);
}
/* Translate control characters into `\003' or `^C' form.
Control characters coming from a display table entry are
currently not translated because we use IT->dpvec to hold
the translation. This could easily be changed but I
don't believe that it is worth doing.
If it->multibyte_p is nonzero, non-printable non-ASCII
characters are also translated to octal form.
If it->multibyte_p is zero, eight-bit characters that
don't have corresponding multibyte char code are also
translated to octal form. */
if ((it->c < ' '
? (it->area != TEXT_AREA
/* In mode line, treat \n, \t like other crl chars. */
|| (it->c != '\t'
&& it->glyph_row
&& (it->glyph_row->mode_line_p || it->avoid_cursor_p))
|| (it->c != '\n' && it->c != '\t'))
: (nbsp_or_shy
|| (it->multibyte_p
? ! CHAR_PRINTABLE_P (it->c)
: (! unibyte_display_via_language_environment
? it->c >= 0x80
: (decoded >= 0x80 && decoded < 0xA0))))))
{
/* IT->c is a control character which must be displayed
either as '\003' or as `^C' where the '\\' and '^'
can be defined in the display table. Fill
IT->ctl_chars with glyphs for what we have to
display. Then, set IT->dpvec to these glyphs. */
Lisp_Object gc;
int ctl_len;
int face_id, lface_id = 0 ;
int escape_glyph;
/* Handle control characters with ^. */
if (it->c < 128 && it->ctl_arrow_p)
{
int g;
g = '^'; /* default glyph for Control */
/* Set IT->ctl_chars[0] to the glyph for `^'. */
if (it->dp
&& (gc = DISP_CTRL_GLYPH (it->dp), GLYPH_CODE_P (gc))
&& GLYPH_CODE_CHAR_VALID_P (gc))
{
g = GLYPH_CODE_CHAR (gc);
lface_id = GLYPH_CODE_FACE (gc);
}
if (lface_id)
{
face_id = merge_faces (it->f, Qt, lface_id, it->face_id);
}
else if (it->f == last_escape_glyph_frame
&& it->face_id == last_escape_glyph_face_id)
{
face_id = last_escape_glyph_merged_face_id;
}
else
{
/* Merge the escape-glyph face into the current face. */
face_id = merge_faces (it->f, Qescape_glyph, 0,
it->face_id);
last_escape_glyph_frame = it->f;
last_escape_glyph_face_id = it->face_id;
last_escape_glyph_merged_face_id = face_id;
}
XSETINT (it->ctl_chars[0], g);
XSETINT (it->ctl_chars[1], it->c ^ 0100);
ctl_len = 2;
goto display_control;
}
/* Handle non-break space in the mode where it only gets
highlighting. */
if (EQ (Vnobreak_char_display, Qt)
&& nbsp_or_shy == char_is_nbsp)
{
/* Merge the no-break-space face into the current face. */
face_id = merge_faces (it->f, Qnobreak_space, 0,
it->face_id);
it->c = ' ';
XSETINT (it->ctl_chars[0], ' ');
ctl_len = 1;
goto display_control;
}
/* Handle sequences that start with the "escape glyph". */
/* the default escape glyph is \. */
escape_glyph = '\\';
if (it->dp
&& (gc = DISP_ESCAPE_GLYPH (it->dp), GLYPH_CODE_P (gc))
&& GLYPH_CODE_CHAR_VALID_P (gc))
{
escape_glyph = GLYPH_CODE_CHAR (gc);
lface_id = GLYPH_CODE_FACE (gc);
}
if (lface_id)
{
/* The display table specified a face.
Merge it into face_id and also into escape_glyph. */
face_id = merge_faces (it->f, Qt, lface_id,
it->face_id);
}
else if (it->f == last_escape_glyph_frame
&& it->face_id == last_escape_glyph_face_id)
{
face_id = last_escape_glyph_merged_face_id;
}
else
{
/* Merge the escape-glyph face into the current face. */
face_id = merge_faces (it->f, Qescape_glyph, 0,
it->face_id);
last_escape_glyph_frame = it->f;
last_escape_glyph_face_id = it->face_id;
last_escape_glyph_merged_face_id = face_id;
}
/* Handle soft hyphens in the mode where they only get
highlighting. */
if (EQ (Vnobreak_char_display, Qt)
&& nbsp_or_shy == char_is_soft_hyphen)
{
it->c = '-';
XSETINT (it->ctl_chars[0], '-');
ctl_len = 1;
goto display_control;
}
/* Handle non-break space and soft hyphen
with the escape glyph. */
if (nbsp_or_shy)
{
XSETINT (it->ctl_chars[0], escape_glyph);
it->c = (nbsp_or_shy == char_is_nbsp ? ' ' : '-');
XSETINT (it->ctl_chars[1], it->c);
ctl_len = 2;
goto display_control;
}
{
unsigned char str[MAX_MULTIBYTE_LENGTH];
int len;
int i;
/* Set IT->ctl_chars[0] to the glyph for `\\'. */
if (CHAR_BYTE8_P (it->c))
{
str[0] = CHAR_TO_BYTE8 (it->c);
len = 1;
}
else if (it->c < 256)
{
str[0] = it->c;
len = 1;
}
else
{
/* It's an invalid character, which shouldn't
happen actually, but due to bugs it may
happen. Let's print the char as is, there's
not much meaningful we can do with it. */
str[0] = it->c;
str[1] = it->c >> 8;
str[2] = it->c >> 16;
str[3] = it->c >> 24;
len = 4;
}
for (i = 0; i < len; i++)
{
int g;
XSETINT (it->ctl_chars[i * 4], escape_glyph);
/* Insert three more glyphs into IT->ctl_chars for
the octal display of the character. */
g = ((str[i] >> 6) & 7) + '0';
XSETINT (it->ctl_chars[i * 4 + 1], g);
g = ((str[i] >> 3) & 7) + '0';
XSETINT (it->ctl_chars[i * 4 + 2], g);
g = (str[i] & 7) + '0';
XSETINT (it->ctl_chars[i * 4 + 3], g);
}
ctl_len = len * 4;
}
display_control:
/* Set up IT->dpvec and return first character from it. */
it->dpvec_char_len = it->len;
it->dpvec = it->ctl_chars;
it->dpend = it->dpvec + ctl_len;
it->current.dpvec_index = 0;
it->dpvec_face_id = face_id;
it->saved_face_id = it->face_id;
it->method = GET_FROM_DISPLAY_VECTOR;
it->ellipsis_p = 0;
goto get_next;
}
}
}
#ifdef HAVE_WINDOW_SYSTEM
/* Adjust face id for a multibyte character. There are no multibyte
character in unibyte text. */
if ((it->what == IT_CHARACTER || it->what == IT_COMPOSITION)
&& it->multibyte_p
&& success_p
&& FRAME_WINDOW_P (it->f))
{
struct face *face = FACE_FROM_ID (it->f, it->face_id);
if (it->what == IT_COMPOSITION && it->cmp_it.ch >= 0)
{
/* Automatic composition with glyph-string. */
Lisp_Object gstring = composition_gstring_from_id (it->cmp_it.id);
it->face_id = face_for_font (it->f, LGSTRING_FONT (gstring), face);
}
else
{
int pos = (it->s ? -1
: STRINGP (it->string) ? IT_STRING_CHARPOS (*it)
: IT_CHARPOS (*it));
it->face_id = FACE_FOR_CHAR (it->f, face, it->c, pos, it->string);
}
}
#endif
/* Is this character the last one of a run of characters with
box? If yes, set IT->end_of_box_run_p to 1. */
if (it->face_box_p
&& it->s == NULL)
{
if (it->method == GET_FROM_STRING && it->sp)
{
int face_id = underlying_face_id (it);
struct face *face = FACE_FROM_ID (it->f, face_id);
if (face)
{
if (face->box == FACE_NO_BOX)
{
/* If the box comes from face properties in a
display string, check faces in that string. */
int string_face_id = face_after_it_pos (it);
it->end_of_box_run_p
= (FACE_FROM_ID (it->f, string_face_id)->box
== FACE_NO_BOX);
}
/* Otherwise, the box comes from the underlying face.
If this is the last string character displayed, check
the next buffer location. */
else if ((IT_STRING_CHARPOS (*it) >= SCHARS (it->string) - 1)
&& (it->current.overlay_string_index
== it->n_overlay_strings - 1))
{
EMACS_INT ignore;
int next_face_id;
struct text_pos pos = it->current.pos;
INC_TEXT_POS (pos, it->multibyte_p);
next_face_id = face_at_buffer_position
(it->w, CHARPOS (pos), it->region_beg_charpos,
it->region_end_charpos, &ignore,
(IT_CHARPOS (*it) + TEXT_PROP_DISTANCE_LIMIT), 0,
-1);
it->end_of_box_run_p
= (FACE_FROM_ID (it->f, next_face_id)->box
== FACE_NO_BOX);
}
}
}
else
{
int face_id = face_after_it_pos (it);
it->end_of_box_run_p
= (face_id != it->face_id
&& FACE_FROM_ID (it->f, face_id)->box == FACE_NO_BOX);
}
}
/* Value is 0 if end of buffer or string reached. */
return success_p;
}
/* Move IT to the next display element.
RESEAT_P non-zero means if called on a newline in buffer text,
skip to the next visible line start.
Functions get_next_display_element and set_iterator_to_next are
separate because I find this arrangement easier to handle than a
get_next_display_element function that also increments IT's
position. The way it is we can first look at an iterator's current
display element, decide whether it fits on a line, and if it does,
increment the iterator position. The other way around we probably
would either need a flag indicating whether the iterator has to be
incremented the next time, or we would have to implement a
decrement position function which would not be easy to write. */
void
set_iterator_to_next (it, reseat_p)
struct it *it;
int reseat_p;
{
/* Reset flags indicating start and end of a sequence of characters
with box. Reset them at the start of this function because
moving the iterator to a new position might set them. */
it->start_of_box_run_p = it->end_of_box_run_p = 0;
switch (it->method)
{
case GET_FROM_BUFFER:
/* The current display element of IT is a character from
current_buffer. Advance in the buffer, and maybe skip over
invisible lines that are so because of selective display. */
if (ITERATOR_AT_END_OF_LINE_P (it) && reseat_p)
reseat_at_next_visible_line_start (it, 0);
else if (it->cmp_it.id >= 0)
{
IT_CHARPOS (*it) += it->cmp_it.nchars;
IT_BYTEPOS (*it) += it->cmp_it.nbytes;
if (it->cmp_it.to < it->cmp_it.nglyphs)
it->cmp_it.from = it->cmp_it.to;
else
{
it->cmp_it.id = -1;
composition_compute_stop_pos (&it->cmp_it, IT_CHARPOS (*it),
IT_BYTEPOS (*it), it->stop_charpos,
Qnil);
}
}
else
{
xassert (it->len != 0);
IT_BYTEPOS (*it) += it->len;
IT_CHARPOS (*it) += 1;
xassert (IT_BYTEPOS (*it) == CHAR_TO_BYTE (IT_CHARPOS (*it)));
}
break;
case GET_FROM_C_STRING:
/* Current display element of IT is from a C string. */
IT_BYTEPOS (*it) += it->len;
IT_CHARPOS (*it) += 1;
break;
case GET_FROM_DISPLAY_VECTOR:
/* Current display element of IT is from a display table entry.
Advance in the display table definition. Reset it to null if
end reached, and continue with characters from buffers/
strings. */
++it->current.dpvec_index;
/* Restore face of the iterator to what they were before the
display vector entry (these entries may contain faces). */
it->face_id = it->saved_face_id;
if (it->dpvec + it->current.dpvec_index == it->dpend)
{
int recheck_faces = it->ellipsis_p;
if (it->s)
it->method = GET_FROM_C_STRING;
else if (STRINGP (it->string))
it->method = GET_FROM_STRING;
else
{
it->method = GET_FROM_BUFFER;
it->object = it->w->buffer;
}
it->dpvec = NULL;
it->current.dpvec_index = -1;
/* Skip over characters which were displayed via IT->dpvec. */
if (it->dpvec_char_len < 0)
reseat_at_next_visible_line_start (it, 1);
else if (it->dpvec_char_len > 0)
{
if (it->method == GET_FROM_STRING
&& it->n_overlay_strings > 0)
it->ignore_overlay_strings_at_pos_p = 1;
it->len = it->dpvec_char_len;
set_iterator_to_next (it, reseat_p);
}
/* Maybe recheck faces after display vector */
if (recheck_faces)
it->stop_charpos = IT_CHARPOS (*it);
}
break;
case GET_FROM_STRING:
/* Current display element is a character from a Lisp string. */
xassert (it->s == NULL && STRINGP (it->string));
if (it->cmp_it.id >= 0)
{
IT_STRING_CHARPOS (*it) += it->cmp_it.nchars;
IT_STRING_BYTEPOS (*it) += it->cmp_it.nbytes;
if (it->cmp_it.to < it->cmp_it.nglyphs)
it->cmp_it.from = it->cmp_it.to;
else
{
it->cmp_it.id = -1;
composition_compute_stop_pos (&it->cmp_it,
IT_STRING_CHARPOS (*it),
IT_STRING_BYTEPOS (*it),
it->stop_charpos, it->string);
}
}
else
{
IT_STRING_BYTEPOS (*it) += it->len;
IT_STRING_CHARPOS (*it) += 1;
}
consider_string_end:
if (it->current.overlay_string_index >= 0)
{
/* IT->string is an overlay string. Advance to the
next, if there is one. */
if (IT_STRING_CHARPOS (*it) >= SCHARS (it->string))
{
it->ellipsis_p = 0;
next_overlay_string (it);
if (it->ellipsis_p)
setup_for_ellipsis (it, 0);
}
}
else
{
/* IT->string is not an overlay string. If we reached
its end, and there is something on IT->stack, proceed
with what is on the stack. This can be either another
string, this time an overlay string, or a buffer. */
if (IT_STRING_CHARPOS (*it) == SCHARS (it->string)
&& it->sp > 0)
{
pop_it (it);
if (it->method == GET_FROM_STRING)
goto consider_string_end;
}
}
break;
case GET_FROM_IMAGE:
case GET_FROM_STRETCH:
/* The position etc with which we have to proceed are on
the stack. The position may be at the end of a string,
if the `display' property takes up the whole string. */
xassert (it->sp > 0);
pop_it (it);
if (it->method == GET_FROM_STRING)
goto consider_string_end;
break;
default:
/* There are no other methods defined, so this should be a bug. */
abort ();
}
xassert (it->method != GET_FROM_STRING
|| (STRINGP (it->string)
&& IT_STRING_CHARPOS (*it) >= 0));
}
/* Load IT's display element fields with information about the next
display element which comes from a display table entry or from the
result of translating a control character to one of the forms `^C'
or `\003'.
IT->dpvec holds the glyphs to return as characters.
IT->saved_face_id holds the face id before the display vector--it
is restored into IT->face_id in set_iterator_to_next. */
static int
next_element_from_display_vector (it)
struct it *it;
{
Lisp_Object gc;
/* Precondition. */
xassert (it->dpvec && it->current.dpvec_index >= 0);
it->face_id = it->saved_face_id;
/* KFS: This code used to check ip->dpvec[0] instead of the current element.
That seemed totally bogus - so I changed it... */
gc = it->dpvec[it->current.dpvec_index];
if (GLYPH_CODE_P (gc) && GLYPH_CODE_CHAR_VALID_P (gc))
{
it->c = GLYPH_CODE_CHAR (gc);
it->len = CHAR_BYTES (it->c);
/* The entry may contain a face id to use. Such a face id is
the id of a Lisp face, not a realized face. A face id of
zero means no face is specified. */
if (it->dpvec_face_id >= 0)
it->face_id = it->dpvec_face_id;
else
{
int lface_id = GLYPH_CODE_FACE (gc);
if (lface_id > 0)
it->face_id = merge_faces (it->f, Qt, lface_id,
it->saved_face_id);
}
}
else
/* Display table entry is invalid. Return a space. */
it->c = ' ', it->len = 1;
/* Don't change position and object of the iterator here. They are
still the values of the character that had this display table
entry or was translated, and that's what we want. */
it->what = IT_CHARACTER;
return 1;
}
/* Load IT with the next display element from Lisp string IT->string.
IT->current.string_pos is the current position within the string.
If IT->current.overlay_string_index >= 0, the Lisp string is an
overlay string. */
static int
next_element_from_string (it)
struct it *it;
{
struct text_pos position;
xassert (STRINGP (it->string));
xassert (IT_STRING_CHARPOS (*it) >= 0);
position = it->current.string_pos;
/* Time to check for invisible text? */
if (IT_STRING_CHARPOS (*it) < it->end_charpos
&& IT_STRING_CHARPOS (*it) == it->stop_charpos)
{
handle_stop (it);
/* Since a handler may have changed IT->method, we must
recurse here. */
return GET_NEXT_DISPLAY_ELEMENT (it);
}
if (it->current.overlay_string_index >= 0)
{
/* Get the next character from an overlay string. In overlay
strings, There is no field width or padding with spaces to
do. */
if (IT_STRING_CHARPOS (*it) >= SCHARS (it->string))
{
it->what = IT_EOB;
return 0;
}
else if (CHAR_COMPOSED_P (it, IT_STRING_CHARPOS (*it),
IT_STRING_BYTEPOS (*it), SCHARS (it->string))
&& next_element_from_composition (it))
{
return 1;
}
else if (STRING_MULTIBYTE (it->string))
{
int remaining = SBYTES (it->string) - IT_STRING_BYTEPOS (*it);
const unsigned char *s = (SDATA (it->string)
+ IT_STRING_BYTEPOS (*it));
it->c = string_char_and_length (s, &it->len);
}
else
{
it->c = SREF (it->string, IT_STRING_BYTEPOS (*it));
it->len = 1;
}
}
else
{
/* Get the next character from a Lisp string that is not an
overlay string. Such strings come from the mode line, for
example. We may have to pad with spaces, or truncate the
string. See also next_element_from_c_string. */
if (IT_STRING_CHARPOS (*it) >= it->end_charpos)
{
it->what = IT_EOB;
return 0;
}
else if (IT_STRING_CHARPOS (*it) >= it->string_nchars)
{
/* Pad with spaces. */
it->c = ' ', it->len = 1;
CHARPOS (position) = BYTEPOS (position) = -1;
}
else if (CHAR_COMPOSED_P (it, IT_STRING_CHARPOS (*it),
IT_STRING_BYTEPOS (*it), it->string_nchars)
&& next_element_from_composition (it))
{
return 1;
}
else if (STRING_MULTIBYTE (it->string))
{
int maxlen = SBYTES (it->string) - IT_STRING_BYTEPOS (*it);
const unsigned char *s = (SDATA (it->string)
+ IT_STRING_BYTEPOS (*it));
it->c = string_char_and_length (s, &it->len);
}
else
{
it->c = SREF (it->string, IT_STRING_BYTEPOS (*it));
it->len = 1;
}
}
/* Record what we have and where it came from. */
it->what = IT_CHARACTER;
it->object = it->string;
it->position = position;
return 1;
}
/* Load IT with next display element from C string IT->s.
IT->string_nchars is the maximum number of characters to return
from the string. IT->end_charpos may be greater than
IT->string_nchars when this function is called, in which case we
may have to return padding spaces. Value is zero if end of string
reached, including padding spaces. */
static int
next_element_from_c_string (it)
struct it *it;
{
int success_p = 1;
xassert (it->s);
it->what = IT_CHARACTER;
BYTEPOS (it->position) = CHARPOS (it->position) = 0;
it->object = Qnil;
/* IT's position can be greater IT->string_nchars in case a field
width or precision has been specified when the iterator was
initialized. */
if (IT_CHARPOS (*it) >= it->end_charpos)
{
/* End of the game. */
it->what = IT_EOB;
success_p = 0;
}
else if (IT_CHARPOS (*it) >= it->string_nchars)
{
/* Pad with spaces. */
it->c = ' ', it->len = 1;
BYTEPOS (it->position) = CHARPOS (it->position) = -1;
}
else if (it->multibyte_p)
{
/* Implementation note: The calls to strlen apparently aren't a
performance problem because there is no noticeable performance
difference between Emacs running in unibyte or multibyte mode. */
int maxlen = strlen (it->s) - IT_BYTEPOS (*it);
it->c = string_char_and_length (it->s + IT_BYTEPOS (*it), &it->len);
}
else
it->c = it->s[IT_BYTEPOS (*it)], it->len = 1;
return success_p;
}
/* Set up IT to return characters from an ellipsis, if appropriate.
The definition of the ellipsis glyphs may come from a display table
entry. This function fills IT with the first glyph from the
ellipsis if an ellipsis is to be displayed. */
static int
next_element_from_ellipsis (it)
struct it *it;
{
if (it->selective_display_ellipsis_p)
setup_for_ellipsis (it, it->len);
else
{
/* The face at the current position may be different from the
face we find after the invisible text. Remember what it
was in IT->saved_face_id, and signal that it's there by
setting face_before_selective_p. */
it->saved_face_id = it->face_id;
it->method = GET_FROM_BUFFER;
it->object = it->w->buffer;
reseat_at_next_visible_line_start (it, 1);
it->face_before_selective_p = 1;
}
return GET_NEXT_DISPLAY_ELEMENT (it);
}
/* Deliver an image display element. The iterator IT is already
filled with image information (done in handle_display_prop). Value
is always 1. */
static int
next_element_from_image (it)
struct it *it;
{
it->what = IT_IMAGE;
return 1;
}
/* Fill iterator IT with next display element from a stretch glyph
property. IT->object is the value of the text property. Value is
always 1. */
static int
next_element_from_stretch (it)
struct it *it;
{
it->what = IT_STRETCH;
return 1;
}
/* Load IT with the next display element from current_buffer. Value
is zero if end of buffer reached. IT->stop_charpos is the next
position at which to stop and check for text properties or buffer
end. */
static int
next_element_from_buffer (it)
struct it *it;
{
int success_p = 1;
xassert (IT_CHARPOS (*it) >= BEGV);
if (IT_CHARPOS (*it) >= it->stop_charpos)
{
if (IT_CHARPOS (*it) >= it->end_charpos)
{
int overlay_strings_follow_p;
/* End of the game, except when overlay strings follow that
haven't been returned yet. */
if (it->overlay_strings_at_end_processed_p)
overlay_strings_follow_p = 0;
else
{
it->overlay_strings_at_end_processed_p = 1;
overlay_strings_follow_p = get_overlay_strings (it, 0);
}
if (overlay_strings_follow_p)
success_p = GET_NEXT_DISPLAY_ELEMENT (it);
else
{
it->what = IT_EOB;
it->position = it->current.pos;
success_p = 0;
}
}
else
{
handle_stop (it);
return GET_NEXT_DISPLAY_ELEMENT (it);
}
}
else
{
/* No face changes, overlays etc. in sight, so just return a
character from current_buffer. */
unsigned char *p;
/* Maybe run the redisplay end trigger hook. Performance note:
This doesn't seem to cost measurable time. */
if (it->redisplay_end_trigger_charpos
&& it->glyph_row
&& IT_CHARPOS (*it) >= it->redisplay_end_trigger_charpos)
run_redisplay_end_trigger_hook (it);
if (CHAR_COMPOSED_P (it, IT_CHARPOS (*it), IT_BYTEPOS (*it),
it->end_charpos)
&& next_element_from_composition (it))
{
return 1;
}
/* Get the next character, maybe multibyte. */
p = BYTE_POS_ADDR (IT_BYTEPOS (*it));
if (it->multibyte_p && !ASCII_BYTE_P (*p))
it->c = STRING_CHAR_AND_LENGTH (p, it->len);
else
it->c = *p, it->len = 1;
/* Record what we have and where it came from. */
it->what = IT_CHARACTER;
it->object = it->w->buffer;
it->position = it->current.pos;
/* Normally we return the character found above, except when we
really want to return an ellipsis for selective display. */
if (it->selective)
{
if (it->c == '\n')
{
/* A value of selective > 0 means hide lines indented more
than that number of columns. */
if (it->selective > 0
&& IT_CHARPOS (*it) + 1 < ZV
&& indented_beyond_p (IT_CHARPOS (*it) + 1,
IT_BYTEPOS (*it) + 1,
(double) it->selective)) /* iftc */
{
success_p = next_element_from_ellipsis (it);
it->dpvec_char_len = -1;
}
}
else if (it->c == '\r' && it->selective == -1)
{
/* A value of selective == -1 means that everything from the
CR to the end of the line is invisible, with maybe an
ellipsis displayed for it. */
success_p = next_element_from_ellipsis (it);
it->dpvec_char_len = -1;
}
}
}
/* Value is zero if end of buffer reached. */
xassert (!success_p || it->what != IT_CHARACTER || it->len > 0);
return success_p;
}
/* Run the redisplay end trigger hook for IT. */
static void
run_redisplay_end_trigger_hook (it)
struct it *it;
{
Lisp_Object args[3];
/* IT->glyph_row should be non-null, i.e. we should be actually
displaying something, or otherwise we should not run the hook. */
xassert (it->glyph_row);
/* Set up hook arguments. */
args[0] = Qredisplay_end_trigger_functions;
args[1] = it->window;
XSETINT (args[2], it->redisplay_end_trigger_charpos);
it->redisplay_end_trigger_charpos = 0;
/* Since we are *trying* to run these functions, don't try to run
them again, even if they get an error. */
it->w->redisplay_end_trigger = Qnil;
Frun_hook_with_args (3, args);
/* Notice if it changed the face of the character we are on. */
handle_face_prop (it);
}
/* Deliver a composition display element. Unlike the other
next_element_from_XXX, this function is not registered in the array
get_next_element[]. It is called from next_element_from_buffer and
next_element_from_string when necessary. */
static int
next_element_from_composition (it)
struct it *it;
{
it->what = IT_COMPOSITION;
it->len = it->cmp_it.nbytes;
if (STRINGP (it->string))
{
if (it->c < 0)
{
IT_STRING_CHARPOS (*it) += it->cmp_it.nchars;
IT_STRING_BYTEPOS (*it) += it->cmp_it.nbytes;
return 0;
}
it->position = it->current.string_pos;
it->object = it->string;
it->c = composition_update_it (&it->cmp_it, IT_STRING_CHARPOS (*it),
IT_STRING_BYTEPOS (*it), it->string);
}
else
{
if (it->c < 0)
{
IT_CHARPOS (*it) += it->cmp_it.nchars;
IT_BYTEPOS (*it) += it->cmp_it.nbytes;
return 0;
}
it->position = it->current.pos;
it->object = it->w->buffer;
it->c = composition_update_it (&it->cmp_it, IT_CHARPOS (*it),
IT_BYTEPOS (*it), Qnil);
}
return 1;
}
/***********************************************************************
Moving an iterator without producing glyphs
***********************************************************************/
/* Check if iterator is at a position corresponding to a valid buffer
position after some move_it_ call. */
#define IT_POS_VALID_AFTER_MOVE_P(it) \
((it)->method == GET_FROM_STRING \
? IT_STRING_CHARPOS (*it) == 0 \
: 1)
/* Move iterator IT to a specified buffer or X position within one
line on the display without producing glyphs.
OP should be a bit mask including some or all of these bits:
MOVE_TO_X: Stop on reaching x-position TO_X.
MOVE_TO_POS: Stop on reaching buffer or string position TO_CHARPOS.
Regardless of OP's value, stop in reaching the end of the display line.
TO_X is normally a value 0 <= TO_X <= IT->last_visible_x.
This means, in particular, that TO_X includes window's horizontal
scroll amount.
The return value has several possible values that
say what condition caused the scan to stop:
MOVE_POS_MATCH_OR_ZV
- when TO_POS or ZV was reached.
MOVE_X_REACHED
-when TO_X was reached before TO_POS or ZV were reached.
MOVE_LINE_CONTINUED
- when we reached the end of the display area and the line must
be continued.
MOVE_LINE_TRUNCATED
- when we reached the end of the display area and the line is
truncated.
MOVE_NEWLINE_OR_CR
- when we stopped at a line end, i.e. a newline or a CR and selective
display is on. */
static enum move_it_result
move_it_in_display_line_to (struct it *it,
EMACS_INT to_charpos, int to_x,
enum move_operation_enum op)
{
enum move_it_result result = MOVE_UNDEFINED;
struct glyph_row *saved_glyph_row;
struct it wrap_it, atpos_it, atx_it;
int may_wrap = 0;
/* Don't produce glyphs in produce_glyphs. */
saved_glyph_row = it->glyph_row;
it->glyph_row = NULL;
/* Use wrap_it to save a copy of IT wherever a word wrap could
occur. Use atpos_it to save a copy of IT at the desired buffer
position, if found, so that we can scan ahead and check if the
word later overshoots the window edge. Use atx_it similarly, for
pixel positions. */
wrap_it.sp = -1;
atpos_it.sp = -1;
atx_it.sp = -1;
#define BUFFER_POS_REACHED_P() \
((op & MOVE_TO_POS) != 0 \
&& BUFFERP (it->object) \
&& IT_CHARPOS (*it) >= to_charpos \
&& (it->method == GET_FROM_BUFFER \
|| (it->method == GET_FROM_DISPLAY_VECTOR \
&& it->dpvec + it->current.dpvec_index + 1 >= it->dpend)))
/* If there's a line-/wrap-prefix, handle it. */
if (it->hpos == 0 && it->method == GET_FROM_BUFFER
&& it->current_y < it->last_visible_y)
handle_line_prefix (it);
while (1)
{
int x, i, ascent = 0, descent = 0;
/* Utility macro to reset an iterator with x, ascent, and descent. */
#define IT_RESET_X_ASCENT_DESCENT(IT) \
((IT)->current_x = x, (IT)->max_ascent = ascent, \
(IT)->max_descent = descent)
/* Stop if we move beyond TO_CHARPOS (after an image or stretch
glyph). */
if ((op & MOVE_TO_POS) != 0
&& BUFFERP (it->object)
&& it->method == GET_FROM_BUFFER
&& IT_CHARPOS (*it) > to_charpos)
{
if (it->line_wrap != WORD_WRAP || wrap_it.sp < 0)
{
result = MOVE_POS_MATCH_OR_ZV;
break;
}
else if (it->line_wrap == WORD_WRAP && atpos_it.sp < 0)
/* If wrap_it is valid, the current position might be in a
word that is wrapped. So, save the iterator in
atpos_it and continue to see if wrapping happens. */
atpos_it = *it;
}
/* Stop when ZV reached.
We used to stop here when TO_CHARPOS reached as well, but that is
too soon if this glyph does not fit on this line. So we handle it
explicitly below. */
if (!get_next_display_element (it))
{
result = MOVE_POS_MATCH_OR_ZV;
break;
}
if (it->line_wrap == TRUNCATE)
{
if (BUFFER_POS_REACHED_P ())
{
result = MOVE_POS_MATCH_OR_ZV;
break;
}
}
else
{
if (it->line_wrap == WORD_WRAP)
{
if (IT_DISPLAYING_WHITESPACE (it))
may_wrap = 1;
else if (may_wrap)
{
/* We have reached a glyph that follows one or more
whitespace characters. If the position is
already found, we are done. */
if (atpos_it.sp >= 0)
{
*it = atpos_it;
result = MOVE_POS_MATCH_OR_ZV;
goto done;
}
if (atx_it.sp >= 0)
{
*it = atx_it;
result = MOVE_X_REACHED;
goto done;
}
/* Otherwise, we can wrap here. */
wrap_it = *it;
may_wrap = 0;
}
}
}
/* Remember the line height for the current line, in case
the next element doesn't fit on the line. */
ascent = it->max_ascent;
descent = it->max_descent;
/* The call to produce_glyphs will get the metrics of the
display element IT is loaded with. Record the x-position
before this display element, in case it doesn't fit on the
line. */
x = it->current_x;
PRODUCE_GLYPHS (it);
if (it->area != TEXT_AREA)
{
set_iterator_to_next (it, 1);
continue;
}
/* The number of glyphs we get back in IT->nglyphs will normally
be 1 except when IT->c is (i) a TAB, or (ii) a multi-glyph
character on a terminal frame, or (iii) a line end. For the
second case, IT->nglyphs - 1 padding glyphs will be present.
(On X frames, there is only one glyph produced for a
composite character.)
The behavior implemented below means, for continuation lines,
that as many spaces of a TAB as fit on the current line are
displayed there. For terminal frames, as many glyphs of a
multi-glyph character are displayed in the current line, too.
This is what the old redisplay code did, and we keep it that
way. Under X, the whole shape of a complex character must
fit on the line or it will be completely displayed in the
next line.
Note that both for tabs and padding glyphs, all glyphs have
the same width. */
if (it->nglyphs)
{
/* More than one glyph or glyph doesn't fit on line. All
glyphs have the same width. */
int single_glyph_width = it->pixel_width / it->nglyphs;
int new_x;
int x_before_this_char = x;
int hpos_before_this_char = it->hpos;
for (i = 0; i < it->nglyphs; ++i, x = new_x)
{
new_x = x + single_glyph_width;
/* We want to leave anything reaching TO_X to the caller. */
if ((op & MOVE_TO_X) && new_x > to_x)
{
if (BUFFER_POS_REACHED_P ())
{
if (it->line_wrap != WORD_WRAP || wrap_it.sp < 0)
goto buffer_pos_reached;
if (atpos_it.sp < 0)
{
atpos_it = *it;
IT_RESET_X_ASCENT_DESCENT (&atpos_it);
}
}
else
{
if (it->line_wrap != WORD_WRAP || wrap_it.sp < 0)
{
it->current_x = x;
result = MOVE_X_REACHED;
break;
}
if (atx_it.sp < 0)
{
atx_it = *it;
IT_RESET_X_ASCENT_DESCENT (&atx_it);
}
}
}
if (/* Lines are continued. */
it->line_wrap != TRUNCATE
&& (/* And glyph doesn't fit on the line. */
new_x > it->last_visible_x
/* Or it fits exactly and we're on a window
system frame. */
|| (new_x == it->last_visible_x
&& FRAME_WINDOW_P (it->f))))
{
if (/* IT->hpos == 0 means the very first glyph
doesn't fit on the line, e.g. a wide image. */
it->hpos == 0
|| (new_x == it->last_visible_x
&& FRAME_WINDOW_P (it->f)))
{
++it->hpos;
it->current_x = new_x;
/* The character's last glyph just barely fits
in this row. */
if (i == it->nglyphs - 1)
{
/* If this is the destination position,
return a position *before* it in this row,
now that we know it fits in this row. */
if (BUFFER_POS_REACHED_P ())
{
if (it->line_wrap != WORD_WRAP
|| wrap_it.sp < 0)
{
it->hpos = hpos_before_this_char;
it->current_x = x_before_this_char;
result = MOVE_POS_MATCH_OR_ZV;
break;
}
if (it->line_wrap == WORD_WRAP
&& atpos_it.sp < 0)
{
atpos_it = *it;
atpos_it.current_x = x_before_this_char;
atpos_it.hpos = hpos_before_this_char;
}
}
set_iterator_to_next (it, 1);
/* On graphical terminals, newlines may
"overflow" into the fringe if
overflow-newline-into-fringe is non-nil.
On text-only terminals, newlines may
overflow into the last glyph on the
display line.*/
if (!FRAME_WINDOW_P (it->f)
|| IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
{
if (!get_next_display_element (it))
{
result = MOVE_POS_MATCH_OR_ZV;
break;
}
if (BUFFER_POS_REACHED_P ())
{
if (ITERATOR_AT_END_OF_LINE_P (it))
result = MOVE_POS_MATCH_OR_ZV;
else
result = MOVE_LINE_CONTINUED;
break;
}
if (ITERATOR_AT_END_OF_LINE_P (it))
{
result = MOVE_NEWLINE_OR_CR;
break;
}
}
}
}
else
IT_RESET_X_ASCENT_DESCENT (it);
if (wrap_it.sp >= 0)
{
*it = wrap_it;
atpos_it.sp = -1;
atx_it.sp = -1;
}
TRACE_MOVE ((stderr, "move_it_in: continued at %d\n",
IT_CHARPOS (*it)));
result = MOVE_LINE_CONTINUED;
break;
}
if (BUFFER_POS_REACHED_P ())
{
if (it->line_wrap != WORD_WRAP || wrap_it.sp < 0)
goto buffer_pos_reached;
if (it->line_wrap == WORD_WRAP && atpos_it.sp < 0)
{
atpos_it = *it;
IT_RESET_X_ASCENT_DESCENT (&atpos_it);
}
}
if (new_x > it->first_visible_x)
{
/* Glyph is visible. Increment number of glyphs that
would be displayed. */
++it->hpos;
}
}
if (result != MOVE_UNDEFINED)
break;
}
else if (BUFFER_POS_REACHED_P ())
{
buffer_pos_reached:
IT_RESET_X_ASCENT_DESCENT (it);
result = MOVE_POS_MATCH_OR_ZV;
break;
}
else if ((op & MOVE_TO_X) && it->current_x >= to_x)
{
/* Stop when TO_X specified and reached. This check is
necessary here because of lines consisting of a line end,
only. The line end will not produce any glyphs and we
would never get MOVE_X_REACHED. */
xassert (it->nglyphs == 0);
result = MOVE_X_REACHED;
break;
}
/* Is this a line end? If yes, we're done. */
if (ITERATOR_AT_END_OF_LINE_P (it))
{
result = MOVE_NEWLINE_OR_CR;
break;
}
/* The current display element has been consumed. Advance
to the next. */
set_iterator_to_next (it, 1);
/* Stop if lines are truncated and IT's current x-position is
past the right edge of the window now. */
if (it->line_wrap == TRUNCATE
&& it->current_x >= it->last_visible_x)
{
if (!FRAME_WINDOW_P (it->f)
|| IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
{
if (!get_next_display_element (it)
|| BUFFER_POS_REACHED_P ())
{
result = MOVE_POS_MATCH_OR_ZV;
break;
}
if (ITERATOR_AT_END_OF_LINE_P (it))
{
result = MOVE_NEWLINE_OR_CR;
break;
}
}
result = MOVE_LINE_TRUNCATED;
break;
}
#undef IT_RESET_X_ASCENT_DESCENT
}
#undef BUFFER_POS_REACHED_P
/* If we scanned beyond to_pos and didn't find a point to wrap at,
restore the saved iterator. */
if (atpos_it.sp >= 0)
*it = atpos_it;
else if (atx_it.sp >= 0)
*it = atx_it;
done:
/* Restore the iterator settings altered at the beginning of this
function. */
it->glyph_row = saved_glyph_row;
return result;
}
/* For external use. */
void
move_it_in_display_line (struct it *it,
EMACS_INT to_charpos, int to_x,
enum move_operation_enum op)
{
if (it->line_wrap == WORD_WRAP
&& (op & MOVE_TO_X))
{
struct it save_it = *it;
int skip = move_it_in_display_line_to (it, to_charpos, to_x, op);
/* When word-wrap is on, TO_X may lie past the end
of a wrapped line. Then it->current is the
character on the next line, so backtrack to the
space before the wrap point. */
if (skip == MOVE_LINE_CONTINUED)
{
int prev_x = max (it->current_x - 1, 0);
*it = save_it;
move_it_in_display_line_to
(it, -1, prev_x, MOVE_TO_X);
}
}
else
move_it_in_display_line_to (it, to_charpos, to_x, op);
}
/* Move IT forward until it satisfies one or more of the criteria in
TO_CHARPOS, TO_X, TO_Y, and TO_VPOS.
OP is a bit-mask that specifies where to stop, and in particular,
which of those four position arguments makes a difference. See the
description of enum move_operation_enum.
If TO_CHARPOS is in invisible text, e.g. a truncated part of a
screen line, this function will set IT to the next position >
TO_CHARPOS. */
void
move_it_to (it, to_charpos, to_x, to_y, to_vpos, op)
struct it *it;
int to_charpos, to_x, to_y, to_vpos;
int op;
{
enum move_it_result skip, skip2 = MOVE_X_REACHED;
int line_height, line_start_x = 0, reached = 0;
for (;;)
{
if (op & MOVE_TO_VPOS)
{
/* If no TO_CHARPOS and no TO_X specified, stop at the
start of the line TO_VPOS. */
if ((op & (MOVE_TO_X | MOVE_TO_POS)) == 0)
{
if (it->vpos == to_vpos)
{
reached = 1;
break;
}
else
skip = move_it_in_display_line_to (it, -1, -1, 0);
}
else
{
/* TO_VPOS >= 0 means stop at TO_X in the line at
TO_VPOS, or at TO_POS, whichever comes first. */
if (it->vpos == to_vpos)
{
reached = 2;
break;
}
skip = move_it_in_display_line_to (it, to_charpos, to_x, op);
if (skip == MOVE_POS_MATCH_OR_ZV || it->vpos == to_vpos)
{
reached = 3;
break;
}
else if (skip == MOVE_X_REACHED && it->vpos != to_vpos)
{
/* We have reached TO_X but not in the line we want. */
skip = move_it_in_display_line_to (it, to_charpos,
-1, MOVE_TO_POS);
if (skip == MOVE_POS_MATCH_OR_ZV)
{
reached = 4;
break;
}
}
}
}
else if (op & MOVE_TO_Y)
{
struct it it_backup;
if (it->line_wrap == WORD_WRAP)
it_backup = *it;
/* TO_Y specified means stop at TO_X in the line containing
TO_Y---or at TO_CHARPOS if this is reached first. The
problem is that we can't really tell whether the line
contains TO_Y before we have completely scanned it, and
this may skip past TO_X. What we do is to first scan to
TO_X.
If TO_X is not specified, use a TO_X of zero. The reason
is to make the outcome of this function more predictable.
If we didn't use TO_X == 0, we would stop at the end of
the line which is probably not what a caller would expect
to happen. */
skip = move_it_in_display_line_to
(it, to_charpos, ((op & MOVE_TO_X) ? to_x : 0),
(MOVE_TO_X | (op & MOVE_TO_POS)));
/* If TO_CHARPOS is reached or ZV, we don't have to do more. */
if (skip == MOVE_POS_MATCH_OR_ZV)
reached = 5;
else if (skip == MOVE_X_REACHED)
{
/* If TO_X was reached, we want to know whether TO_Y is
in the line. We know this is the case if the already
scanned glyphs make the line tall enough. Otherwise,
we must check by scanning the rest of the line. */
line_height = it->max_ascent + it->max_descent;
if (to_y >= it->current_y
&& to_y < it->current_y + line_height)
{
reached = 6;
break;
}
it_backup = *it;
TRACE_MOVE ((stderr, "move_it: from %d\n", IT_CHARPOS (*it)));
skip2 = move_it_in_display_line_to (it, to_charpos, -1,
op & MOVE_TO_POS);
TRACE_MOVE ((stderr, "move_it: to %d\n", IT_CHARPOS (*it)));
line_height = it->max_ascent + it->max_descent;
TRACE_MOVE ((stderr, "move_it: line_height = %d\n", line_height));
if (to_y >= it->current_y
&& to_y < it->current_y + line_height)
{
/* If TO_Y is in this line and TO_X was reached
above, we scanned too far. We have to restore
IT's settings to the ones before skipping. */
*it = it_backup;
reached = 6;
}
else
{
skip = skip2;
if (skip == MOVE_POS_MATCH_OR_ZV)
reached = 7;
}
}
else
{
/* Check whether TO_Y is in this line. */
line_height = it->max_ascent + it->max_descent;
TRACE_MOVE ((stderr, "move_it: line_height = %d\n", line_height));
if (to_y >= it->current_y
&& to_y < it->current_y + line_height)
{
/* When word-wrap is on, TO_X may lie past the end
of a wrapped line. Then it->current is the
character on the next line, so backtrack to the
space before the wrap point. */
if (skip == MOVE_LINE_CONTINUED
&& it->line_wrap == WORD_WRAP)
{
int prev_x = max (it->current_x - 1, 0);
*it = it_backup;
skip = move_it_in_display_line_to
(it, -1, prev_x, MOVE_TO_X);
}
reached = 6;
}
}
if (reached)
break;
}
else if (BUFFERP (it->object)
&& (it->method == GET_FROM_BUFFER
|| it->method == GET_FROM_STRETCH)
&& IT_CHARPOS (*it) >= to_charpos)
skip = MOVE_POS_MATCH_OR_ZV;
else
skip = move_it_in_display_line_to (it, to_charpos, -1, MOVE_TO_POS);
switch (skip)
{
case MOVE_POS_MATCH_OR_ZV:
reached = 8;
goto out;
case MOVE_NEWLINE_OR_CR:
set_iterator_to_next (it, 1);
it->continuation_lines_width = 0;
break;
case MOVE_LINE_TRUNCATED:
it->continuation_lines_width = 0;
reseat_at_next_visible_line_start (it, 0);
if ((op & MOVE_TO_POS) != 0
&& IT_CHARPOS (*it) > to_charpos)
{
reached = 9;
goto out;
}
break;
case MOVE_LINE_CONTINUED:
/* For continued lines ending in a tab, some of the glyphs
associated with the tab are displayed on the current
line. Since it->current_x does not include these glyphs,
we use it->last_visible_x instead. */
if (it->c == '\t')
{
it->continuation_lines_width += it->last_visible_x;
/* When moving by vpos, ensure that the iterator really
advances to the next line (bug#847, bug#969). Fixme:
do we need to do this in other circumstances? */
if (it->current_x != it->last_visible_x
&& (op & MOVE_TO_VPOS)
&& !(op & (MOVE_TO_X | MOVE_TO_POS)))
{
line_start_x = it->current_x + it->pixel_width
- it->last_visible_x;
set_iterator_to_next (it, 0);
}
}
else
it->continuation_lines_width += it->current_x;
break;
default:
abort ();
}
/* Reset/increment for the next run. */
recenter_overlay_lists (current_buffer, IT_CHARPOS (*it));
it->current_x = line_start_x;
line_start_x = 0;
it->hpos = 0;
it->current_y += it->max_ascent + it->max_descent;
++it->vpos;
last_height = it->max_ascent + it->max_descent;
last_max_ascent = it->max_ascent;
it->max_ascent = it->max_descent = 0;
}
out:
/* On text terminals, we may stop at the end of a line in the middle
of a multi-character glyph. If the glyph itself is continued,
i.e. it is actually displayed on the next line, don't treat this
stopping point as valid; move to the next line instead (unless
that brings us offscreen). */
if (!FRAME_WINDOW_P (it->f)
&& op & MOVE_TO_POS
&& IT_CHARPOS (*it) == to_charpos
&& it->what == IT_CHARACTER
&& it->nglyphs > 1
&& it->line_wrap == WINDOW_WRAP
&& it->current_x == it->last_visible_x - 1
&& it->c != '\n'
&& it->c != '\t'
&& it->vpos < XFASTINT (it->w->window_end_vpos))
{
it->continuation_lines_width += it->current_x;
it->current_x = it->hpos = it->max_ascent = it->max_descent = 0;
it->current_y += it->max_ascent + it->max_descent;
++it->vpos;
last_height = it->max_ascent + it->max_descent;
last_max_ascent = it->max_ascent;
}
TRACE_MOVE ((stderr, "move_it_to: reached %d\n", reached));
}
/* Move iterator IT backward by a specified y-distance DY, DY >= 0.
If DY > 0, move IT backward at least that many pixels. DY = 0
means move IT backward to the preceding line start or BEGV. This
function may move over more than DY pixels if IT->current_y - DY
ends up in the middle of a line; in this case IT->current_y will be
set to the top of the line moved to. */
void
move_it_vertically_backward (it, dy)
struct it *it;
int dy;
{
int nlines, h;
struct it it2, it3;
int start_pos;
move_further_back:
xassert (dy >= 0);
start_pos = IT_CHARPOS (*it);
/* Estimate how many newlines we must move back. */
nlines = max (1, dy / FRAME_LINE_HEIGHT (it->f));
/* Set the iterator's position that many lines back. */
while (nlines-- && IT_CHARPOS (*it) > BEGV)
back_to_previous_visible_line_start (it);
/* Reseat the iterator here. When moving backward, we don't want
reseat to skip forward over invisible text, set up the iterator
to deliver from overlay strings at the new position etc. So,
use reseat_1 here. */
reseat_1 (it, it->current.pos, 1);
/* We are now surely at a line start. */
it->current_x = it->hpos = 0;
it->continuation_lines_width = 0;
/* Move forward and see what y-distance we moved. First move to the
start of the next line so that we get its height. We need this
height to be able to tell whether we reached the specified
y-distance. */
it2 = *it;
it2.max_ascent = it2.max_descent = 0;
do
{
move_it_to (&it2, start_pos, -1, -1, it2.vpos + 1,
MOVE_TO_POS | MOVE_TO_VPOS);
}
while (!IT_POS_VALID_AFTER_MOVE_P (&it2));
xassert (IT_CHARPOS (*it) >= BEGV);
it3 = it2;
move_it_to (&it2, start_pos, -1, -1, -1, MOVE_TO_POS);
xassert (IT_CHARPOS (*it) >= BEGV);
/* H is the actual vertical distance from the position in *IT
and the starting position. */
h = it2.current_y - it->current_y;
/* NLINES is the distance in number of lines. */
nlines = it2.vpos - it->vpos;
/* Correct IT's y and vpos position
so that they are relative to the starting point. */
it->vpos -= nlines;
it->current_y -= h;
if (dy == 0)
{
/* DY == 0 means move to the start of the screen line. The
value of nlines is > 0 if continuation lines were involved. */
if (nlines > 0)
move_it_by_lines (it, nlines, 1);
}
else
{
/* The y-position we try to reach, relative to *IT.
Note that H has been subtracted in front of the if-statement. */
int target_y = it->current_y + h - dy;
int y0 = it3.current_y;
int y1 = line_bottom_y (&it3);
int line_height = y1 - y0;
/* If we did not reach target_y, try to move further backward if
we can. If we moved too far backward, try to move forward. */
if (target_y < it->current_y
/* This is heuristic. In a window that's 3 lines high, with
a line height of 13 pixels each, recentering with point
on the bottom line will try to move -39/2 = 19 pixels
backward. Try to avoid moving into the first line. */
&& (it->current_y - target_y
> min (window_box_height (it->w), line_height * 2 / 3))
&& IT_CHARPOS (*it) > BEGV)
{
TRACE_MOVE ((stderr, " not far enough -> move_vert %d\n",
target_y - it->current_y));
dy = it->current_y - target_y;
goto move_further_back;
}
else if (target_y >= it->current_y + line_height
&& IT_CHARPOS (*it) < ZV)
{
/* Should move forward by at least one line, maybe more.
Note: Calling move_it_by_lines can be expensive on
terminal frames, where compute_motion is used (via
vmotion) to do the job, when there are very long lines
and truncate-lines is nil. That's the reason for
treating terminal frames specially here. */
if (!FRAME_WINDOW_P (it->f))
move_it_vertically (it, target_y - (it->current_y + line_height));
else
{
do
{
move_it_by_lines (it, 1, 1);
}
while (target_y >= line_bottom_y (it) && IT_CHARPOS (*it) < ZV);
}
}
}
}
/* Move IT by a specified amount of pixel lines DY. DY negative means
move backwards. DY = 0 means move to start of screen line. At the
end, IT will be on the start of a screen line. */
void
move_it_vertically (it, dy)
struct it *it;
int dy;
{
if (dy <= 0)
move_it_vertically_backward (it, -dy);
else
{
TRACE_MOVE ((stderr, "move_it_v: from %d, %d\n", IT_CHARPOS (*it), dy));
move_it_to (it, ZV, -1, it->current_y + dy, -1,
MOVE_TO_POS | MOVE_TO_Y);
TRACE_MOVE ((stderr, "move_it_v: to %d\n", IT_CHARPOS (*it)));
/* If buffer ends in ZV without a newline, move to the start of
the line to satisfy the post-condition. */
if (IT_CHARPOS (*it) == ZV
&& ZV > BEGV
&& FETCH_BYTE (IT_BYTEPOS (*it) - 1) != '\n')
move_it_by_lines (it, 0, 0);
}
}
/* Move iterator IT past the end of the text line it is in. */
void
move_it_past_eol (it)
struct it *it;
{
enum move_it_result rc;
rc = move_it_in_display_line_to (it, Z, 0, MOVE_TO_POS);
if (rc == MOVE_NEWLINE_OR_CR)
set_iterator_to_next (it, 0);
}
/* Move IT by a specified number DVPOS of screen lines down. DVPOS
negative means move up. DVPOS == 0 means move to the start of the
screen line. NEED_Y_P non-zero means calculate IT->current_y. If
NEED_Y_P is zero, IT->current_y will be left unchanged.
Further optimization ideas: If we would know that IT->f doesn't use
a face with proportional font, we could be faster for
truncate-lines nil. */
void
move_it_by_lines (it, dvpos, need_y_p)
struct it *it;
int dvpos, need_y_p;
{
struct position pos;
/* The commented-out optimization uses vmotion on terminals. This
gives bad results, because elements like it->what, on which
callers such as pos_visible_p rely, aren't updated. */
/* if (!FRAME_WINDOW_P (it->f))
{
struct text_pos textpos;
pos = *vmotion (IT_CHARPOS (*it), dvpos, it->w);
SET_TEXT_POS (textpos, pos.bufpos, pos.bytepos);
reseat (it, textpos, 1);
it->vpos += pos.vpos;
it->current_y += pos.vpos;
}
else */
if (dvpos == 0)
{
/* DVPOS == 0 means move to the start of the screen line. */
move_it_vertically_backward (it, 0);
xassert (it->current_x == 0 && it->hpos == 0);
/* Let next call to line_bottom_y calculate real line height */
last_height = 0;
}
else if (dvpos > 0)
{
move_it_to (it, -1, -1, -1, it->vpos + dvpos, MOVE_TO_VPOS);
if (!IT_POS_VALID_AFTER_MOVE_P (it))
move_it_to (it, IT_CHARPOS (*it) + 1, -1, -1, -1, MOVE_TO_POS);
}
else
{
struct it it2;
int start_charpos, i;
/* Start at the beginning of the screen line containing IT's
position. This may actually move vertically backwards,
in case of overlays, so adjust dvpos accordingly. */
dvpos += it->vpos;
move_it_vertically_backward (it, 0);
dvpos -= it->vpos;
/* Go back -DVPOS visible lines and reseat the iterator there. */
start_charpos = IT_CHARPOS (*it);
for (i = -dvpos; i > 0 && IT_CHARPOS (*it) > BEGV; --i)
back_to_previous_visible_line_start (it);
reseat (it, it->current.pos, 1);
/* Move further back if we end up in a string or an image. */
while (!IT_POS_VALID_AFTER_MOVE_P (it))
{
/* First try to move to start of display line. */
dvpos += it->vpos;
move_it_vertically_backward (it, 0);
dvpos -= it->vpos;
if (IT_POS_VALID_AFTER_MOVE_P (it))
break;
/* If start of line is still in string or image,
move further back. */
back_to_previous_visible_line_start (it);
reseat (it, it->current.pos, 1);
dvpos--;
}
it->current_x = it->hpos = 0;
/* Above call may have moved too far if continuation lines
are involved. Scan forward and see if it did. */
it2 = *it;
it2.vpos = it2.current_y = 0;
move_it_to (&it2, start_charpos, -1, -1, -1, MOVE_TO_POS);
it->vpos -= it2.vpos;
it->current_y -= it2.current_y;
it->current_x = it->hpos = 0;
/* If we moved too far back, move IT some lines forward. */
if (it2.vpos > -dvpos)
{
int delta = it2.vpos + dvpos;
it2 = *it;
move_it_to (it, -1, -1, -1, it->vpos + delta, MOVE_TO_VPOS);
/* Move back again if we got too far ahead. */
if (IT_CHARPOS (*it) >= start_charpos)
*it = it2;
}
}
}
/* Return 1 if IT points into the middle of a display vector. */
int
in_display_vector_p (it)
struct it *it;
{
return (it->method == GET_FROM_DISPLAY_VECTOR
&& it->current.dpvec_index > 0
&& it->dpvec + it->current.dpvec_index != it->dpend);
}
/***********************************************************************
Messages
***********************************************************************/
/* Add a message with format string FORMAT and arguments ARG1 and ARG2
to *Messages*. */
void
add_to_log (format, arg1, arg2)
char *format;
Lisp_Object arg1, arg2;
{
Lisp_Object args[3];
Lisp_Object msg, fmt;
char *buffer;
int len;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
USE_SAFE_ALLOCA;
/* Do nothing if called asynchronously. Inserting text into
a buffer may call after-change-functions and alike and
that would means running Lisp asynchronously. */
if (handling_signal)
return;
fmt = msg = Qnil;
GCPRO4 (fmt, msg, arg1, arg2);
args[0] = fmt = build_string (format);
args[1] = arg1;
args[2] = arg2;
msg = Fformat (3, args);
len = SBYTES (msg) + 1;
SAFE_ALLOCA (buffer, char *, len);
bcopy (SDATA (msg), buffer, len);
message_dolog (buffer, len - 1, 1, 0);
SAFE_FREE ();
UNGCPRO;
}
/* Output a newline in the *Messages* buffer if "needs" one. */
void
message_log_maybe_newline ()
{
if (message_log_need_newline)
message_dolog ("", 0, 1, 0);
}
/* Add a string M of length NBYTES to the message log, optionally
terminated with a newline when NLFLAG is non-zero. MULTIBYTE, if
nonzero, means interpret the contents of M as multibyte. This
function calls low-level routines in order to bypass text property
hooks, etc. which might not be safe to run.
This may GC (insert may run before/after change hooks),
so the buffer M must NOT point to a Lisp string. */
void
message_dolog (m, nbytes, nlflag, multibyte)
const char *m;
int nbytes, nlflag, multibyte;
{
if (!NILP (Vmemory_full))
return;
if (!NILP (Vmessage_log_max))
{
struct buffer *oldbuf;
Lisp_Object oldpoint, oldbegv, oldzv;
int old_windows_or_buffers_changed = windows_or_buffers_changed;
int point_at_end = 0;
int zv_at_end = 0;
Lisp_Object old_deactivate_mark, tem;
struct gcpro gcpro1;
old_deactivate_mark = Vdeactivate_mark;
oldbuf = current_buffer;
Fset_buffer (Fget_buffer_create (Vmessages_buffer_name));
current_buffer->undo_list = Qt;
oldpoint = message_dolog_marker1;
set_marker_restricted (oldpoint, make_number (PT), Qnil);
oldbegv = message_dolog_marker2;
set_marker_restricted (oldbegv, make_number (BEGV), Qnil);
oldzv = message_dolog_marker3;
set_marker_restricted (oldzv, make_number (ZV), Qnil);
GCPRO1 (old_deactivate_mark);
if (PT == Z)
point_at_end = 1;
if (ZV == Z)
zv_at_end = 1;
BEGV = BEG;
BEGV_BYTE = BEG_BYTE;
ZV = Z;
ZV_BYTE = Z_BYTE;
TEMP_SET_PT_BOTH (Z, Z_BYTE);
/* Insert the string--maybe converting multibyte to single byte
or vice versa, so that all the text fits the buffer. */
if (multibyte
&& NILP (current_buffer->enable_multibyte_characters))
{
int i, c, char_bytes;
unsigned char work[1];
/* Convert a multibyte string to single-byte
for the *Message* buffer. */
for (i = 0; i < nbytes; i += char_bytes)
{
c = string_char_and_length (m + i, &char_bytes);
work[0] = (ASCII_CHAR_P (c)
? c
: multibyte_char_to_unibyte (c, Qnil));
insert_1_both (work, 1, 1, 1, 0, 0);
}
}
else if (! multibyte
&& ! NILP (current_buffer->enable_multibyte_characters))
{
int i, c, char_bytes;
unsigned char *msg = (unsigned char *) m;
unsigned char str[MAX_MULTIBYTE_LENGTH];
/* Convert a single-byte string to multibyte
for the *Message* buffer. */
for (i = 0; i < nbytes; i++)
{
c = msg[i];
MAKE_CHAR_MULTIBYTE (c);
char_bytes = CHAR_STRING (c, str);
insert_1_both (str, 1, char_bytes, 1, 0, 0);
}
}
else if (nbytes)
insert_1 (m, nbytes, 1, 0, 0);
if (nlflag)
{
int this_bol, this_bol_byte, prev_bol, prev_bol_byte, dup;
insert_1 ("\n", 1, 1, 0, 0);
scan_newline (Z, Z_BYTE, BEG, BEG_BYTE, -2, 0);
this_bol = PT;
this_bol_byte = PT_BYTE;
/* See if this line duplicates the previous one.
If so, combine duplicates. */
if (this_bol > BEG)
{
scan_newline (PT, PT_BYTE, BEG, BEG_BYTE, -2, 0);
prev_bol = PT;
prev_bol_byte = PT_BYTE;
dup = message_log_check_duplicate (prev_bol, prev_bol_byte,
this_bol, this_bol_byte);
if (dup)
{
del_range_both (prev_bol, prev_bol_byte,
this_bol, this_bol_byte, 0);
if (dup > 1)
{
char dupstr[40];
int duplen;
/* If you change this format, don't forget to also
change message_log_check_duplicate. */
sprintf (dupstr, " [%d times]", dup);
duplen = strlen (dupstr);
TEMP_SET_PT_BOTH (Z - 1, Z_BYTE - 1);
insert_1 (dupstr, duplen, 1, 0, 1);
}
}
}
/* If we have more than the desired maximum number of lines
in the *Messages* buffer now, delete the oldest ones.
This is safe because we don't have undo in this buffer. */
if (NATNUMP (Vmessage_log_max))
{
scan_newline (Z, Z_BYTE, BEG, BEG_BYTE,
-XFASTINT (Vmessage_log_max) - 1, 0);
del_range_both (BEG, BEG_BYTE, PT, PT_BYTE, 0);
}
}
BEGV = XMARKER (oldbegv)->charpos;
BEGV_BYTE = marker_byte_position (oldbegv);
if (zv_at_end)
{
ZV = Z;
ZV_BYTE = Z_BYTE;
}
else
{
ZV = XMARKER (oldzv)->charpos;
ZV_BYTE = marker_byte_position (oldzv);
}
if (point_at_end)
TEMP_SET_PT_BOTH (Z, Z_BYTE);
else
/* We can't do Fgoto_char (oldpoint) because it will run some
Lisp code. */
TEMP_SET_PT_BOTH (XMARKER (oldpoint)->charpos,
XMARKER (oldpoint)->bytepos);
UNGCPRO;
unchain_marker (XMARKER (oldpoint));
unchain_marker (XMARKER (oldbegv));
unchain_marker (XMARKER (oldzv));
tem = Fget_buffer_window (Fcurrent_buffer (), Qt);
set_buffer_internal (oldbuf);
if (NILP (tem))
windows_or_buffers_changed = old_windows_or_buffers_changed;
message_log_need_newline = !nlflag;
Vdeactivate_mark = old_deactivate_mark;
}
}
/* We are at the end of the buffer after just having inserted a newline.
(Note: We depend on the fact we won't be crossing the gap.)
Check to see if the most recent message looks a lot like the previous one.
Return 0 if different, 1 if the new one should just replace it, or a
value N > 1 if we should also append " [N times]". */
static int
message_log_check_duplicate (prev_bol, prev_bol_byte, this_bol, this_bol_byte)
int prev_bol, this_bol;
int prev_bol_byte, this_bol_byte;
{
int i;
int len = Z_BYTE - 1 - this_bol_byte;
int seen_dots = 0;
unsigned char *p1 = BUF_BYTE_ADDRESS (current_buffer, prev_bol_byte);
unsigned char *p2 = BUF_BYTE_ADDRESS (current_buffer, this_bol_byte);
for (i = 0; i < len; i++)
{
if (i >= 3 && p1[i-3] == '.' && p1[i-2] == '.' && p1[i-1] == '.')
seen_dots = 1;
if (p1[i] != p2[i])
return seen_dots;
}
p1 += len;
if (*p1 == '\n')
return 2;
if (*p1++ == ' ' && *p1++ == '[')
{
int n = 0;
while (*p1 >= '0' && *p1 <= '9')
n = n * 10 + *p1++ - '0';
if (strncmp (p1, " times]\n", 8) == 0)
return n+1;
}
return 0;
}
/* Display an echo area message M with a specified length of NBYTES
bytes. The string may include null characters. If M is 0, clear
out any existing message, and let the mini-buffer text show
through.
This may GC, so the buffer M must NOT point to a Lisp string. */
void
message2 (m, nbytes, multibyte)
const char *m;
int nbytes;
int multibyte;
{
/* First flush out any partial line written with print. */
message_log_maybe_newline ();
if (m)
message_dolog (m, nbytes, 1, multibyte);
message2_nolog (m, nbytes, multibyte);
}
/* The non-logging counterpart of message2. */
void
message2_nolog (m, nbytes, multibyte)
const char *m;
int nbytes, multibyte;
{
struct frame *sf = SELECTED_FRAME ();
message_enable_multibyte = multibyte;
if (FRAME_INITIAL_P (sf))
{
if (noninteractive_need_newline)
putc ('\n', stderr);
noninteractive_need_newline = 0;
if (m)
fwrite (m, nbytes, 1, stderr);
if (cursor_in_echo_area == 0)
fprintf (stderr, "\n");
fflush (stderr);
}
/* A null message buffer means that the frame hasn't really been
initialized yet. Error messages get reported properly by
cmd_error, so this must be just an informative message; toss it. */
else if (INTERACTIVE
&& sf->glyphs_initialized_p
&& FRAME_MESSAGE_BUF (sf))
{
Lisp_Object mini_window;
struct frame *f;
/* Get the frame containing the mini-buffer
that the selected frame is using. */
mini_window = FRAME_MINIBUF_WINDOW (sf);
f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
FRAME_SAMPLE_VISIBILITY (f);
if (FRAME_VISIBLE_P (sf)
&& ! FRAME_VISIBLE_P (f))
Fmake_frame_visible (WINDOW_FRAME (XWINDOW (mini_window)));
if (m)
{
set_message (m, Qnil, nbytes, multibyte);
if (minibuffer_auto_raise)
Fraise_frame (WINDOW_FRAME (XWINDOW (mini_window)));
}
else
clear_message (1, 1);
do_pending_window_change (0);
echo_area_display (1);
do_pending_window_change (0);
if (FRAME_TERMINAL (f)->frame_up_to_date_hook != 0 && ! gc_in_progress)
(*FRAME_TERMINAL (f)->frame_up_to_date_hook) (f);
}
}
/* Display an echo area message M with a specified length of NBYTES
bytes. The string may include null characters. If M is not a
string, clear out any existing message, and let the mini-buffer
text show through.
This function cancels echoing. */
void
message3 (m, nbytes, multibyte)
Lisp_Object m;
int nbytes;
int multibyte;
{
struct gcpro gcpro1;
GCPRO1 (m);
clear_message (1,1);
cancel_echoing ();
/* First flush out any partial line written with print. */
message_log_maybe_newline ();
if (STRINGP (m))
{
char *buffer;
USE_SAFE_ALLOCA;
SAFE_ALLOCA (buffer, char *, nbytes);
bcopy (SDATA (m), buffer, nbytes);
message_dolog (buffer, nbytes, 1, multibyte);
SAFE_FREE ();
}
message3_nolog (m, nbytes, multibyte);
UNGCPRO;
}
/* The non-logging version of message3.
This does not cancel echoing, because it is used for echoing.
Perhaps we need to make a separate function for echoing
and make this cancel echoing. */
void
message3_nolog (m, nbytes, multibyte)
Lisp_Object m;
int nbytes, multibyte;
{
struct frame *sf = SELECTED_FRAME ();
message_enable_multibyte = multibyte;
if (FRAME_INITIAL_P (sf))
{
if (noninteractive_need_newline)
putc ('\n', stderr);
noninteractive_need_newline = 0;
if (STRINGP (m))
fwrite (SDATA (m), nbytes, 1, stderr);
if (cursor_in_echo_area == 0)
fprintf (stderr, "\n");
fflush (stderr);
}
/* A null message buffer means that the frame hasn't really been
initialized yet. Error messages get reported properly by
cmd_error, so this must be just an informative message; toss it. */
else if (INTERACTIVE
&& sf->glyphs_initialized_p
&& FRAME_MESSAGE_BUF (sf))
{
Lisp_Object mini_window;
Lisp_Object frame;
struct frame *f;
/* Get the frame containing the mini-buffer
that the selected frame is using. */
mini_window = FRAME_MINIBUF_WINDOW (sf);
frame = XWINDOW (mini_window)->frame;
f = XFRAME (frame);
FRAME_SAMPLE_VISIBILITY (f);
if (FRAME_VISIBLE_P (sf)
&& !FRAME_VISIBLE_P (f))
Fmake_frame_visible (frame);
if (STRINGP (m) && SCHARS (m) > 0)
{
set_message (NULL, m, nbytes, multibyte);
if (minibuffer_auto_raise)
Fraise_frame (frame);
/* Assume we are not echoing.
(If we are, echo_now will override this.) */
echo_message_buffer = Qnil;
}
else
clear_message (1, 1);
do_pending_window_change (0);
echo_area_display (1);
do_pending_window_change (0);
if (FRAME_TERMINAL (f)->frame_up_to_date_hook != 0 && ! gc_in_progress)
(*FRAME_TERMINAL (f)->frame_up_to_date_hook) (f);
}
}
/* Display a null-terminated echo area message M. If M is 0, clear
out any existing message, and let the mini-buffer text show through.
The buffer M must continue to exist until after the echo area gets
cleared or some other message gets displayed there. Do not pass
text that is stored in a Lisp string. Do not pass text in a buffer
that was alloca'd. */
void
message1 (m)
char *m;
{
message2 (m, (m ? strlen (m) : 0), 0);
}
/* The non-logging counterpart of message1. */
void
message1_nolog (m)
char *m;
{
message2_nolog (m, (m ? strlen (m) : 0), 0);
}
/* Display a message M which contains a single %s
which gets replaced with STRING. */
void
message_with_string (m, string, log)
char *m;
Lisp_Object string;
int log;
{
CHECK_STRING (string);
if (noninteractive)
{
if (m)
{
if (noninteractive_need_newline)
putc ('\n', stderr);
noninteractive_need_newline = 0;
fprintf (stderr, m, SDATA (string));
if (!cursor_in_echo_area)
fprintf (stderr, "\n");
fflush (stderr);
}
}
else if (INTERACTIVE)
{
/* The frame whose minibuffer we're going to display the message on.
It may be larger than the selected frame, so we need
to use its buffer, not the selected frame's buffer. */
Lisp_Object mini_window;
struct frame *f, *sf = SELECTED_FRAME ();
/* Get the frame containing the minibuffer
that the selected frame is using. */
mini_window = FRAME_MINIBUF_WINDOW (sf);
f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
/* A null message buffer means that the frame hasn't really been
initialized yet. Error messages get reported properly by
cmd_error, so this must be just an informative message; toss it. */
if (FRAME_MESSAGE_BUF (f))
{
Lisp_Object args[2], message;
struct gcpro gcpro1, gcpro2;
args[0] = build_string (m);
args[1] = message = string;
GCPRO2 (args[0], message);
gcpro1.nvars = 2;
message = Fformat (2, args);
if (log)
message3 (message, SBYTES (message), STRING_MULTIBYTE (message));
else
message3_nolog (message, SBYTES (message), STRING_MULTIBYTE (message));
UNGCPRO;
/* Print should start at the beginning of the message
buffer next time. */
message_buf_print = 0;
}
}
}
/* Dump an informative message to the minibuf. If M is 0, clear out
any existing message, and let the mini-buffer text show through. */
/* VARARGS 1 */
void
message (m, a1, a2, a3)
char *m;
EMACS_INT a1, a2, a3;
{
if (noninteractive)
{
if (m)
{
if (noninteractive_need_newline)
putc ('\n', stderr);
noninteractive_need_newline = 0;
fprintf (stderr, m, a1, a2, a3);
if (cursor_in_echo_area == 0)
fprintf (stderr, "\n");
fflush (stderr);
}
}
else if (INTERACTIVE)
{
/* The frame whose mini-buffer we're going to display the message
on. It may be larger than the selected frame, so we need to
use its buffer, not the selected frame's buffer. */
Lisp_Object mini_window;
struct frame *f, *sf = SELECTED_FRAME ();
/* Get the frame containing the mini-buffer
that the selected frame is using. */
mini_window = FRAME_MINIBUF_WINDOW (sf);
f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
/* A null message buffer means that the frame hasn't really been
initialized yet. Error messages get reported properly by
cmd_error, so this must be just an informative message; toss
it. */
if (FRAME_MESSAGE_BUF (f))
{
if (m)
{
int len;
#ifdef NO_ARG_ARRAY
char *a[3];
a[0] = (char *) a1;
a[1] = (char *) a2;
a[2] = (char *) a3;
len = doprnt (FRAME_MESSAGE_BUF (f),
FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a);
#else
len = doprnt (FRAME_MESSAGE_BUF (f),
FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3,
(char **) &a1);
#endif /* NO_ARG_ARRAY */
message2 (FRAME_MESSAGE_BUF (f), len, 0);
}
else
message1 (0);
/* Print should start at the beginning of the message
buffer next time. */
message_buf_print = 0;
}
}
}
/* The non-logging version of message. */
void
message_nolog (m, a1, a2, a3)
char *m;
EMACS_INT a1, a2, a3;
{
Lisp_Object old_log_max;
old_log_max = Vmessage_log_max;
Vmessage_log_max = Qnil;
message (m, a1, a2, a3);
Vmessage_log_max = old_log_max;
}
/* Display the current message in the current mini-buffer. This is
only called from error handlers in process.c, and is not time
critical. */
void
update_echo_area ()
{
if (!NILP (echo_area_buffer[0]))
{
Lisp_Object string;
string = Fcurrent_message ();
message3 (string, SBYTES (string),
!NILP (current_buffer->enable_multibyte_characters));
}
}
/* Make sure echo area buffers in `echo_buffers' are live.
If they aren't, make new ones. */
static void
ensure_echo_area_buffers ()
{
int i;
for (i = 0; i < 2; ++i)
if (!BUFFERP (echo_buffer[i])
|| NILP (XBUFFER (echo_buffer[i])->name))
{
char name[30];
Lisp_Object old_buffer;
int j;
old_buffer = echo_buffer[i];
sprintf (name, " *Echo Area %d*", i);
echo_buffer[i] = Fget_buffer_create (build_string (name));
XBUFFER (echo_buffer[i])->truncate_lines = Qnil;
/* to force word wrap in echo area -
it was decided to postpone this*/
/* XBUFFER (echo_buffer[i])->word_wrap = Qt; */
for (j = 0; j < 2; ++j)
if (EQ (old_buffer, echo_area_buffer[j]))
echo_area_buffer[j] = echo_buffer[i];
}
}
/* Call FN with args A1..A4 with either the current or last displayed
echo_area_buffer as current buffer.
WHICH zero means use the current message buffer
echo_area_buffer[0]. If that is nil, choose a suitable buffer
from echo_buffer[] and clear it.
WHICH > 0 means use echo_area_buffer[1]. If that is nil, choose a
suitable buffer from echo_buffer[] and clear it.
If WHICH < 0, set echo_area_buffer[1] to echo_area_buffer[0], so
that the current message becomes the last displayed one, make
choose a suitable buffer for echo_area_buffer[0], and clear it.
Value is what FN returns. */
static int
with_echo_area_buffer (w, which, fn, a1, a2, a3, a4)
struct window *w;
int which;
int (*fn) P_ ((EMACS_INT, Lisp_Object, EMACS_INT, EMACS_INT));
EMACS_INT a1;
Lisp_Object a2;
EMACS_INT a3, a4;
{
Lisp_Object buffer;
int this_one, the_other, clear_buffer_p, rc;
int count = SPECPDL_INDEX ();
/* If buffers aren't live, make new ones. */
ensure_echo_area_buffers ();
clear_buffer_p = 0;
if (which == 0)
this_one = 0, the_other = 1;
else if (which > 0)
this_one = 1, the_other = 0;
else
{
this_one = 0, the_other = 1;
clear_buffer_p = 1;
/* We need a fresh one in case the current echo buffer equals
the one containing the last displayed echo area message. */
if (!NILP (echo_area_buffer[this_one])
&& EQ (echo_area_buffer[this_one], echo_area_buffer[the_other]))
echo_area_buffer[this_one] = Qnil;
}
/* Choose a suitable buffer from echo_buffer[] is we don't
have one. */
if (NILP (echo_area_buffer[this_one]))
{
echo_area_buffer[this_one]
= (EQ (echo_area_buffer[the_other], echo_buffer[this_one])
? echo_buffer[the_other]
: echo_buffer[this_one]);
clear_buffer_p = 1;
}
buffer = echo_area_buffer[this_one];
/* Don't get confused by reusing the buffer used for echoing
for a different purpose. */
if (echo_kboard == NULL && EQ (buffer, echo_message_buffer))
cancel_echoing ();
record_unwind_protect (unwind_with_echo_area_buffer,
with_echo_area_buffer_unwind_data (w));
/* Make the echo area buffer current. Note that for display
purposes, it is not necessary that the displayed window's buffer
== current_buffer, except for text property lookup. So, let's
only set that buffer temporarily here without doing a full
Fset_window_buffer. We must also change w->pointm, though,
because otherwise an assertions in unshow_buffer fails, and Emacs
aborts. */
set_buffer_internal_1 (XBUFFER (buffer));
if (w)
{
w->buffer = buffer;
set_marker_both (w->pointm, buffer, BEG, BEG_BYTE);
}
current_buffer->undo_list = Qt;
current_buffer->read_only = Qnil;
specbind (Qinhibit_read_only, Qt);
specbind (Qinhibit_modification_hooks, Qt);
if (clear_buffer_p && Z > BEG)
del_range (BEG, Z);
xassert (BEGV >= BEG);
xassert (ZV <= Z && ZV >= BEGV);
rc = fn (a1, a2, a3, a4);
xassert (BEGV >= BEG);
xassert (ZV <= Z && ZV >= BEGV);
unbind_to (count, Qnil);
return rc;
}
/* Save state that should be preserved around the call to the function
FN called in with_echo_area_buffer. */
static Lisp_Object
with_echo_area_buffer_unwind_data (w)
struct window *w;
{
int i = 0;
Lisp_Object vector, tmp;
/* Reduce consing by keeping one vector in
Vwith_echo_area_save_vector. */
vector = Vwith_echo_area_save_vector;
Vwith_echo_area_save_vector = Qnil;
if (NILP (vector))
vector = Fmake_vector (make_number (7), Qnil);
XSETBUFFER (tmp, current_buffer); ASET (vector, i, tmp); ++i;
ASET (vector, i, Vdeactivate_mark); ++i;
ASET (vector, i, make_number (windows_or_buffers_changed)); ++i;
if (w)
{
XSETWINDOW (tmp, w); ASET (vector, i, tmp); ++i;
ASET (vector, i, w->buffer); ++i;
ASET (vector, i, make_number (XMARKER (w->pointm)->charpos)); ++i;
ASET (vector, i, make_number (XMARKER (w->pointm)->bytepos)); ++i;
}
else
{
int end = i + 4;
for (; i < end; ++i)
ASET (vector, i, Qnil);
}
xassert (i == ASIZE (vector));
return vector;
}
/* Restore global state from VECTOR which was created by
with_echo_area_buffer_unwind_data. */
static Lisp_Object
unwind_with_echo_area_buffer (vector)
Lisp_Object vector;
{
set_buffer_internal_1 (XBUFFER (AREF (vector, 0)));
Vdeactivate_mark = AREF (vector, 1);
windows_or_buffers_changed = XFASTINT (AREF (vector, 2));
if (WINDOWP (AREF (vector, 3)))
{
struct window *w;
Lisp_Object buffer, charpos, bytepos;
w = XWINDOW (AREF (vector, 3));
buffer = AREF (vector, 4);
charpos = AREF (vector, 5);
bytepos = AREF (vector, 6);
w->buffer = buffer;
set_marker_both (w->pointm, buffer,
XFASTINT (charpos), XFASTINT (bytepos));
}
Vwith_echo_area_save_vector = vector;
return Qnil;
}
/* Set up the echo area for use by print functions. MULTIBYTE_P
non-zero means we will print multibyte. */
void
setup_echo_area_for_printing (multibyte_p)
int multibyte_p;
{
/* If we can't find an echo area any more, exit. */
if (! FRAME_LIVE_P (XFRAME (selected_frame)))
Fkill_emacs (Qnil);
ensure_echo_area_buffers ();
if (!message_buf_print)
{
/* A message has been output since the last time we printed.
Choose a fresh echo area buffer. */
if (EQ (echo_area_buffer[1], echo_buffer[0]))
echo_area_buffer[0] = echo_buffer[1];
else
echo_area_buffer[0] = echo_buffer[0];
/* Switch to that buffer and clear it. */
set_buffer_internal (XBUFFER (echo_area_buffer[0]));
current_buffer->truncate_lines = Qnil;
if (Z > BEG)
{
int count = SPECPDL_INDEX ();
specbind (Qinhibit_read_only, Qt);
/* Note that undo recording is always disabled. */
del_range (BEG, Z);
unbind_to (count, Qnil);
}
TEMP_SET_PT_BOTH (BEG, BEG_BYTE);
/* Set up the buffer for the multibyteness we need. */
if (multibyte_p
!= !NILP (current_buffer->enable_multibyte_characters))
Fset_buffer_multibyte (multibyte_p ? Qt : Qnil);
/* Raise the frame containing the echo area. */
if (minibuffer_auto_raise)
{
struct frame *sf = SELECTED_FRAME ();
Lisp_Object mini_window;
mini_window = FRAME_MINIBUF_WINDOW (sf);
Fraise_frame (WINDOW_FRAME (XWINDOW (mini_window)));
}
message_log_maybe_newline ();
message_buf_print = 1;
}
else
{
if (NILP (echo_area_buffer[0]))
{
if (EQ (echo_area_buffer[1], echo_buffer[0]))
echo_area_buffer[0] = echo_buffer[1];
else
echo_area_buffer[0] = echo_buffer[0];
}
if (current_buffer != XBUFFER (echo_area_buffer[0]))
{
/* Someone switched buffers between print requests. */
set_buffer_internal (XBUFFER (echo_area_buffer[0]));
current_buffer->truncate_lines = Qnil;
}
}
}
/* Display an echo area message in window W. Value is non-zero if W's
height is changed. If display_last_displayed_message_p is
non-zero, display the message that was last displayed, otherwise
display the current message. */
static int
display_echo_area (w)
struct window *w;
{
int i, no_message_p, window_height_changed_p, count;
/* Temporarily disable garbage collections while displaying the echo
area. This is done because a GC can print a message itself.
That message would modify the echo area buffer's contents while a
redisplay of the buffer is going on, and seriously confuse
redisplay. */
count = inhibit_garbage_collection ();
/* If there is no message, we must call display_echo_area_1
nevertheless because it resizes the window. But we will have to
reset the echo_area_buffer in question to nil at the end because
with_echo_area_buffer will sets it to an empty buffer. */
i = display_last_displayed_message_p ? 1 : 0;
no_message_p = NILP (echo_area_buffer[i]);
window_height_changed_p
= with_echo_area_buffer (w, display_last_displayed_message_p,
display_echo_area_1,
(EMACS_INT) w, Qnil, 0, 0);
if (no_message_p)
echo_area_buffer[i] = Qnil;
unbind_to (count, Qnil);
return window_height_changed_p;
}
/* Helper for display_echo_area. Display the current buffer which
contains the current echo area message in window W, a mini-window,
a pointer to which is passed in A1. A2..A4 are currently not used.
Change the height of W so that all of the message is displayed.
Value is non-zero if height of W was changed. */
static int
display_echo_area_1 (a1, a2, a3, a4)
EMACS_INT a1;
Lisp_Object a2;
EMACS_INT a3, a4;
{
struct window *w = (struct window *) a1;
Lisp_Object window;
struct text_pos start;
int window_height_changed_p = 0;
/* Do this before displaying, so that we have a large enough glyph
matrix for the display. If we can't get enough space for the
whole text, display the last N lines. That works by setting w->start. */
window_height_changed_p = resize_mini_window (w, 0);
/* Use the starting position chosen by resize_mini_window. */
SET_TEXT_POS_FROM_MARKER (start, w->start);
/* Display. */
clear_glyph_matrix (w->desired_matrix);
XSETWINDOW (window, w);
try_window (window, start, 0);
return window_height_changed_p;
}
/* Resize the echo area window to exactly the size needed for the
currently displayed message, if there is one. If a mini-buffer
is active, don't shrink it. */
void
resize_echo_area_exactly ()
{
if (BUFFERP (echo_area_buffer[0])
&& WINDOWP (echo_area_window))
{
struct window *w = XWINDOW (echo_area_window);
int resized_p;
Lisp_Object resize_exactly;
if (minibuf_level == 0)
resize_exactly = Qt;
else
resize_exactly = Qnil;
resized_p = with_echo_area_buffer (w, 0, resize_mini_window_1,
(EMACS_INT) w, resize_exactly, 0, 0);
if (resized_p)
{
++windows_or_buffers_changed;
++update_mode_lines;
redisplay_internal (0);
}
}
}
/* Callback function for with_echo_area_buffer, when used from
resize_echo_area_exactly. A1 contains a pointer to the window to
resize, EXACTLY non-nil means resize the mini-window exactly to the
size of the text displayed. A3 and A4 are not used. Value is what
resize_mini_window returns. */
static int
resize_mini_window_1 (a1, exactly, a3, a4)
EMACS_INT a1;
Lisp_Object exactly;
EMACS_INT a3, a4;
{
return resize_mini_window ((struct window *) a1, !NILP (exactly));
}
/* Resize mini-window W to fit the size of its contents. EXACT_P
means size the window exactly to the size needed. Otherwise, it's
only enlarged until W's buffer is empty.
Set W->start to the right place to begin display. If the whole
contents fit, start at the beginning. Otherwise, start so as
to make the end of the contents appear. This is particularly
important for y-or-n-p, but seems desirable generally.
Value is non-zero if the window height has been changed. */
int
resize_mini_window (w, exact_p)
struct window *w;
int exact_p;
{
struct frame *f = XFRAME (w->frame);
int window_height_changed_p = 0;
xassert (MINI_WINDOW_P (w));
/* By default, start display at the beginning. */
set_marker_both (w->start, w->buffer,
BUF_BEGV (XBUFFER (w->buffer)),
BUF_BEGV_BYTE (XBUFFER (w->buffer)));
/* Don't resize windows while redisplaying a window; it would
confuse redisplay functions when the size of the window they are
displaying changes from under them. Such a resizing can happen,
for instance, when which-func prints a long message while
we are running fontification-functions. We're running these
functions with safe_call which binds inhibit-redisplay to t. */
if (!NILP (Vinhibit_redisplay))
return 0;
/* Nil means don't try to resize. */
if (NILP (Vresize_mini_windows)
|| (FRAME_X_P (f) && FRAME_X_OUTPUT (f) == NULL))
return 0;
if (!FRAME_MINIBUF_ONLY_P (f))
{
struct it it;
struct window *root = XWINDOW (FRAME_ROOT_WINDOW (f));
int total_height = WINDOW_TOTAL_LINES (root) + WINDOW_TOTAL_LINES (w);
int height, max_height;
int unit = FRAME_LINE_HEIGHT (f);
struct text_pos start;
struct buffer *old_current_buffer = NULL;
if (current_buffer != XBUFFER (w->buffer))
{
old_current_buffer = current_buffer;
set_buffer_internal (XBUFFER (w->buffer));
}
init_iterator (&it, w, BEGV, BEGV_BYTE, NULL, DEFAULT_FACE_ID);
/* Compute the max. number of lines specified by the user. */
if (FLOATP (Vmax_mini_window_height))
max_height = XFLOATINT (Vmax_mini_window_height) * FRAME_LINES (f);
else if (INTEGERP (Vmax_mini_window_height))
max_height = XINT (Vmax_mini_window_height);
else
max_height = total_height / 4;
/* Correct that max. height if it's bogus. */
max_height = max (1, max_height);
max_height = min (total_height, max_height);
/* Find out the height of the text in the window. */
if (it.line_wrap == TRUNCATE)
height = 1;
else
{
last_height = 0;
move_it_to (&it, ZV, -1, -1, -1, MOVE_TO_POS);
if (it.max_ascent == 0 && it.max_descent == 0)
height = it.current_y + last_height;
else
height = it.current_y + it.max_ascent + it.max_descent;
height -= min (it.extra_line_spacing, it.max_extra_line_spacing);
height = (height + unit - 1) / unit;
}
/* Compute a suitable window start. */
if (height > max_height)
{
height = max_height;
init_iterator (&it, w, ZV, ZV_BYTE, NULL, DEFAULT_FACE_ID);
move_it_vertically_backward (&it, (height - 1) * unit);
start = it.current.pos;
}
else
SET_TEXT_POS (start, BEGV, BEGV_BYTE);
SET_MARKER_FROM_TEXT_POS (w->start, start);
if (EQ (Vresize_mini_windows, Qgrow_only))
{
/* Let it grow only, until we display an empty message, in which
case the window shrinks again. */
if (height > WINDOW_TOTAL_LINES (w))
{
int old_height = WINDOW_TOTAL_LINES (w);
freeze_window_starts (f, 1);
grow_mini_window (w, height - WINDOW_TOTAL_LINES (w));
window_height_changed_p = WINDOW_TOTAL_LINES (w) != old_height;
}
else if (height < WINDOW_TOTAL_LINES (w)
&& (exact_p || BEGV == ZV))
{
int old_height = WINDOW_TOTAL_LINES (w);
freeze_window_starts (f, 0);
shrink_mini_window (w);
window_height_changed_p = WINDOW_TOTAL_LINES (w) != old_height;
}
}
else
{
/* Always resize to exact size needed. */
if (height > WINDOW_TOTAL_LINES (w))
{
int old_height = WINDOW_TOTAL_LINES (w);
freeze_window_starts (f, 1);
grow_mini_window (w, height - WINDOW_TOTAL_LINES (w));
window_height_changed_p = WINDOW_TOTAL_LINES (w) != old_height;
}
else if (height < WINDOW_TOTAL_LINES (w))
{
int old_height = WINDOW_TOTAL_LINES (w);
freeze_window_starts (f, 0);
shrink_mini_window (w);
if (height)
{
freeze_window_starts (f, 1);
grow_mini_window (w, height - WINDOW_TOTAL_LINES (w));
}
window_height_changed_p = WINDOW_TOTAL_LINES (w) != old_height;
}
}
if (old_current_buffer)
set_buffer_internal (old_current_buffer);
}
return window_height_changed_p;
}
/* Value is the current message, a string, or nil if there is no
current message. */
Lisp_Object
current_message ()
{
Lisp_Object msg;
if (!BUFFERP (echo_area_buffer[0]))
msg = Qnil;
else
{
with_echo_area_buffer (0, 0, current_message_1,
(EMACS_INT) &msg, Qnil, 0, 0);
if (NILP (msg))
echo_area_buffer[0] = Qnil;
}
return msg;
}
static int
current_message_1 (a1, a2, a3, a4)
EMACS_INT a1;
Lisp_Object a2;
EMACS_INT a3, a4;
{
Lisp_Object *msg = (Lisp_Object *) a1;
if (Z > BEG)
*msg = make_buffer_string (BEG, Z, 1);
else
*msg = Qnil;
return 0;
}
/* Push the current message on Vmessage_stack for later restauration
by restore_message. Value is non-zero if the current message isn't
empty. This is a relatively infrequent operation, so it's not
worth optimizing. */
int
push_message ()
{
Lisp_Object msg;
msg = current_message ();
Vmessage_stack = Fcons (msg, Vmessage_stack);
return STRINGP (msg);
}
/* Restore message display from the top of Vmessage_stack. */
void
restore_message ()
{
Lisp_Object msg;
xassert (CONSP (Vmessage_stack));
msg = XCAR (Vmessage_stack);
if (STRINGP (msg))
message3_nolog (msg, SBYTES (msg), STRING_MULTIBYTE (msg));
else
message3_nolog (msg, 0, 0);
}
/* Handler for record_unwind_protect calling pop_message. */
Lisp_Object
pop_message_unwind (dummy)
Lisp_Object dummy;
{
pop_message ();
return Qnil;
}
/* Pop the top-most entry off Vmessage_stack. */
void
pop_message ()
{
xassert (CONSP (Vmessage_stack));
Vmessage_stack = XCDR (Vmessage_stack);
}
/* Check that Vmessage_stack is nil. Called from emacs.c when Emacs
exits. If the stack is not empty, we have a missing pop_message
somewhere. */
void
check_message_stack ()
{
if (!NILP (Vmessage_stack))
abort ();
}
/* Truncate to NCHARS what will be displayed in the echo area the next
time we display it---but don't redisplay it now. */
void
truncate_echo_area (nchars)
int nchars;
{
if (nchars == 0)
echo_area_buffer[0] = Qnil;
/* A null message buffer means that the frame hasn't really been
initialized yet. Error messages get reported properly by
cmd_error, so this must be just an informative message; toss it. */
else if (!noninteractive
&& INTERACTIVE
&& !NILP (echo_area_buffer[0]))
{
struct frame *sf = SELECTED_FRAME ();
if (FRAME_MESSAGE_BUF (sf))
with_echo_area_buffer (0, 0, truncate_message_1, nchars, Qnil, 0, 0);
}
}
/* Helper function for truncate_echo_area. Truncate the current
message to at most NCHARS characters. */
static int
truncate_message_1 (nchars, a2, a3, a4)
EMACS_INT nchars;
Lisp_Object a2;
EMACS_INT a3, a4;
{
if (BEG + nchars < Z)
del_range (BEG + nchars, Z);
if (Z == BEG)
echo_area_buffer[0] = Qnil;
return 0;
}
/* Set the current message to a substring of S or STRING.
If STRING is a Lisp string, set the message to the first NBYTES
bytes from STRING. NBYTES zero means use the whole string. If
STRING is multibyte, the message will be displayed multibyte.
If S is not null, set the message to the first LEN bytes of S. LEN
zero means use the whole string. MULTIBYTE_P non-zero means S is
multibyte. Display the message multibyte in that case.
Doesn't GC, as with_echo_area_buffer binds Qinhibit_modification_hooks
to t before calling set_message_1 (which calls insert).
*/
void
set_message (s, string, nbytes, multibyte_p)
const char *s;
Lisp_Object string;
int nbytes, multibyte_p;
{
message_enable_multibyte
= ((s && multibyte_p)
|| (STRINGP (string) && STRING_MULTIBYTE (string)));
with_echo_area_buffer (0, -1, set_message_1,
(EMACS_INT) s, string, nbytes, multibyte_p);
message_buf_print = 0;
help_echo_showing_p = 0;
}
/* Helper function for set_message. Arguments have the same meaning
as there, with A1 corresponding to S and A2 corresponding to STRING
This function is called with the echo area buffer being
current. */
static int
set_message_1 (a1, a2, nbytes, multibyte_p)
EMACS_INT a1;
Lisp_Object a2;
EMACS_INT nbytes, multibyte_p;
{
const char *s = (const char *) a1;
Lisp_Object string = a2;
/* Change multibyteness of the echo buffer appropriately. */
if (message_enable_multibyte
!= !NILP (current_buffer->enable_multibyte_characters))
Fset_buffer_multibyte (message_enable_multibyte ? Qt : Qnil);
current_buffer->truncate_lines = message_truncate_lines ? Qt : Qnil;
/* Insert new message at BEG. */
TEMP_SET_PT_BOTH (BEG, BEG_BYTE);
if (STRINGP (string))
{
int nchars;
if (nbytes == 0)
nbytes = SBYTES (string);
nchars = string_byte_to_char (string, nbytes);
/* This function takes care of single/multibyte conversion. We
just have to ensure that the echo area buffer has the right
setting of enable_multibyte_characters. */
insert_from_string (string, 0, 0, nchars, nbytes, 1);
}
else if (s)
{
if (nbytes == 0)
nbytes = strlen (s);
if (multibyte_p && NILP (current_buffer->enable_multibyte_characters))
{
/* Convert from multi-byte to single-byte. */
int i, c, n;
unsigned char work[1];
/* Convert a multibyte string to single-byte. */
for (i = 0; i < nbytes; i += n)
{
c = string_char_and_length (s + i, &n);
work[0] = (ASCII_CHAR_P (c)
? c
: multibyte_char_to_unibyte (c, Qnil));
insert_1_both (work, 1, 1, 1, 0, 0);
}
}
else if (!multibyte_p
&& !NILP (current_buffer->enable_multibyte_characters))
{
/* Convert from single-byte to multi-byte. */
int i, c, n;
const unsigned char *msg = (const unsigned char *) s;
unsigned char str[MAX_MULTIBYTE_LENGTH];
/* Convert a single-byte string to multibyte. */
for (i = 0; i < nbytes; i++)
{
c = msg[i];
MAKE_CHAR_MULTIBYTE (c);
n = CHAR_STRING (c, str);
insert_1_both (str, 1, n, 1, 0, 0);
}
}
else
insert_1 (s, nbytes, 1, 0, 0);
}
return 0;
}
/* Clear messages. CURRENT_P non-zero means clear the current
message. LAST_DISPLAYED_P non-zero means clear the message
last displayed. */
void
clear_message (current_p, last_displayed_p)
int current_p, last_displayed_p;
{
if (current_p)
{
echo_area_buffer[0] = Qnil;
message_cleared_p = 1;
}
if (last_displayed_p)
echo_area_buffer[1] = Qnil;
message_buf_print = 0;
}
/* Clear garbaged frames.
This function is used where the old redisplay called
redraw_garbaged_frames which in turn called redraw_frame which in
turn called clear_frame. The call to clear_frame was a source of
flickering. I believe a clear_frame is not necessary. It should
suffice in the new redisplay to invalidate all current matrices,
and ensure a complete redisplay of all windows. */
static void
clear_garbaged_frames ()
{
if (frame_garbaged)
{
Lisp_Object tail, frame;
int changed_count = 0;
FOR_EACH_FRAME (tail, frame)
{
struct frame *f = XFRAME (frame);
if (FRAME_VISIBLE_P (f) && FRAME_GARBAGED_P (f))
{
if (f->resized_p)
{
Fredraw_frame (frame);
f->force_flush_display_p = 1;
}
clear_current_matrices (f);
changed_count++;
f->garbaged = 0;
f->resized_p = 0;
}
}
frame_garbaged = 0;
if (changed_count)
++windows_or_buffers_changed;
}
}
/* Redisplay the echo area of the selected frame. If UPDATE_FRAME_P
is non-zero update selected_frame. Value is non-zero if the
mini-windows height has been changed. */
static int
echo_area_display (update_frame_p)
int update_frame_p;
{
Lisp_Object mini_window;
struct window *w;
struct frame *f;
int window_height_changed_p = 0;
struct frame *sf = SELECTED_FRAME ();
mini_window = FRAME_MINIBUF_WINDOW (sf);
w = XWINDOW (mini_window);
f = XFRAME (WINDOW_FRAME (w));
/* Don't display if frame is invisible or not yet initialized. */
if (!FRAME_VISIBLE_P (f) || !f->glyphs_initialized_p)
return 0;
#ifdef HAVE_WINDOW_SYSTEM
/* When Emacs starts, selected_frame may be the initial terminal
frame. If we let this through, a message would be displayed on
the terminal. */
if (FRAME_INITIAL_P (XFRAME (selected_frame)))
return 0;
#endif /* HAVE_WINDOW_SYSTEM */
/* Redraw garbaged frames. */
if (frame_garbaged)
clear_garbaged_frames ();
if (!NILP (echo_area_buffer[0]) || minibuf_level == 0)
{
echo_area_window = mini_window;
window_height_changed_p = display_echo_area (w);
w->must_be_updated_p = 1;
/* Update the display, unless called from redisplay_internal.
Also don't update the screen during redisplay itself. The
update will happen at the end of redisplay, and an update
here could cause confusion. */
if (update_frame_p && !redisplaying_p)
{
int n = 0;
/* If the display update has been interrupted by pending
input, update mode lines in the frame. Due to the
pending input, it might have been that redisplay hasn't
been called, so that mode lines above the echo area are
garbaged. This looks odd, so we prevent it here. */
if (!display_completed)
n = redisplay_mode_lines (FRAME_ROOT_WINDOW (f), 0);
if (window_height_changed_p
/* Don't do this if Emacs is shutting down. Redisplay
needs to run hooks. */
&& !NILP (Vrun_hooks))
{
/* Must update other windows. Likewise as in other
cases, don't let this update be interrupted by
pending input. */
int count = SPECPDL_INDEX ();
specbind (Qredisplay_dont_pause, Qt);
windows_or_buffers_changed = 1;
redisplay_internal (0);
unbind_to (count, Qnil);
}
else if (FRAME_WINDOW_P (f) && n == 0)
{
/* Window configuration is the same as before.
Can do with a display update of the echo area,
unless we displayed some mode lines. */
update_single_window (w, 1);
FRAME_RIF (f)->flush_display (f);
}
else
update_frame (f, 1, 1);
/* If cursor is in the echo area, make sure that the next
redisplay displays the minibuffer, so that the cursor will
be replaced with what the minibuffer wants. */
if (cursor_in_echo_area)
++windows_or_buffers_changed;
}
}
else if (!EQ (mini_window, selected_window))
windows_or_buffers_changed++;
/* Last displayed message is now the current message. */
echo_area_buffer[1] = echo_area_buffer[0];
/* Inform read_char that we're not echoing. */
echo_message_buffer = Qnil;
/* Prevent redisplay optimization in redisplay_internal by resetting
this_line_start_pos. This is done because the mini-buffer now
displays the message instead of its buffer text. */
if (EQ (mini_window, selected_window))
CHARPOS (this_line_start_pos) = 0;
return window_height_changed_p;
}
/***********************************************************************
Mode Lines and Frame Titles
***********************************************************************/
/* A buffer for constructing non-propertized mode-line strings and
frame titles in it; allocated from the heap in init_xdisp and
resized as needed in store_mode_line_noprop_char. */
static char *mode_line_noprop_buf;
/* The buffer's end, and a current output position in it. */
static char *mode_line_noprop_buf_end;
static char *mode_line_noprop_ptr;
#define MODE_LINE_NOPROP_LEN(start) \
((mode_line_noprop_ptr - mode_line_noprop_buf) - start)
static enum {
MODE_LINE_DISPLAY = 0,
MODE_LINE_TITLE,
MODE_LINE_NOPROP,
MODE_LINE_STRING
} mode_line_target;
/* Alist that caches the results of :propertize.
Each element is (PROPERTIZED-STRING . PROPERTY-LIST). */
static Lisp_Object mode_line_proptrans_alist;
/* List of strings making up the mode-line. */
static Lisp_Object mode_line_string_list;
/* Base face property when building propertized mode line string. */
static Lisp_Object mode_line_string_face;
static Lisp_Object mode_line_string_face_prop;
/* Unwind data for mode line strings */
static Lisp_Object Vmode_line_unwind_vector;
static Lisp_Object
format_mode_line_unwind_data (struct buffer *obuf,
Lisp_Object owin,
int save_proptrans)
{
Lisp_Object vector, tmp;
/* Reduce consing by keeping one vector in
Vwith_echo_area_save_vector. */
vector = Vmode_line_unwind_vector;
Vmode_line_unwind_vector = Qnil;
if (NILP (vector))
vector = Fmake_vector (make_number (8), Qnil);
ASET (vector, 0, make_number (mode_line_target));
ASET (vector, 1, make_number (MODE_LINE_NOPROP_LEN (0)));
ASET (vector, 2, mode_line_string_list);
ASET (vector, 3, save_proptrans ? mode_line_proptrans_alist : Qt);
ASET (vector, 4, mode_line_string_face);
ASET (vector, 5, mode_line_string_face_prop);
if (obuf)
XSETBUFFER (tmp, obuf);
else
tmp = Qnil;
ASET (vector, 6, tmp);
ASET (vector, 7, owin);
return vector;
}
static Lisp_Object
unwind_format_mode_line (vector)
Lisp_Object vector;
{
mode_line_target = XINT (AREF (vector, 0));
mode_line_noprop_ptr = mode_line_noprop_buf + XINT (AREF (vector, 1));
mode_line_string_list = AREF (vector, 2);
if (! EQ (AREF (vector, 3), Qt))
mode_line_proptrans_alist = AREF (vector, 3);
mode_line_string_face = AREF (vector, 4);
mode_line_string_face_prop = AREF (vector, 5);
if (!NILP (AREF (vector, 7)))
/* Select window before buffer, since it may change the buffer. */
Fselect_window (AREF (vector, 7), Qt);
if (!NILP (AREF (vector, 6)))
{
set_buffer_internal_1 (XBUFFER (AREF (vector, 6)));
ASET (vector, 6, Qnil);
}
Vmode_line_unwind_vector = vector;
return Qnil;
}
/* Store a single character C for the frame title in mode_line_noprop_buf.
Re-allocate mode_line_noprop_buf if necessary. */
static void
#ifdef PROTOTYPES
store_mode_line_noprop_char (char c)
#else
store_mode_line_noprop_char (c)
char c;
#endif
{
/* If output position has reached the end of the allocated buffer,
double the buffer's size. */
if (mode_line_noprop_ptr == mode_line_noprop_buf_end)
{
int len = MODE_LINE_NOPROP_LEN (0);
int new_size = 2 * len * sizeof *mode_line_noprop_buf;
mode_line_noprop_buf = (char *) xrealloc (mode_line_noprop_buf, new_size);
mode_line_noprop_buf_end = mode_line_noprop_buf + new_size;
mode_line_noprop_ptr = mode_line_noprop_buf + len;
}
*mode_line_noprop_ptr++ = c;
}
/* Store part of a frame title in mode_line_noprop_buf, beginning at
mode_line_noprop_ptr. STR is the string to store. Do not copy
characters that yield more columns than PRECISION; PRECISION <= 0
means copy the whole string. Pad with spaces until FIELD_WIDTH
number of characters have been copied; FIELD_WIDTH <= 0 means don't
pad. Called from display_mode_element when it is used to build a
frame title. */
static int
store_mode_line_noprop (str, field_width, precision)
const unsigned char *str;
int field_width, precision;
{
int n = 0;
int dummy, nbytes;
/* Copy at most PRECISION chars from STR. */
nbytes = strlen (str);
n += c_string_width (str, nbytes, precision, &dummy, &nbytes);
while (nbytes--)
store_mode_line_noprop_char (*str++);
/* Fill up with spaces until FIELD_WIDTH reached. */
while (field_width > 0
&& n < field_width)
{
store_mode_line_noprop_char (' ');
++n;
}
return n;
}
/***********************************************************************
Frame Titles
***********************************************************************/
#ifdef HAVE_WINDOW_SYSTEM
/* Set the title of FRAME, if it has changed. The title format is
Vicon_title_format if FRAME is iconified, otherwise it is
frame_title_format. */
static void
x_consider_frame_title (frame)
Lisp_Object frame;
{
struct frame *f = XFRAME (frame);
if (FRAME_WINDOW_P (f)
|| FRAME_MINIBUF_ONLY_P (f)
|| f->explicit_name)
{
/* Do we have more than one visible frame on this X display? */
Lisp_Object tail;
Lisp_Object fmt;
int title_start;
char *title;
int len;
struct it it;
int count = SPECPDL_INDEX ();
for (tail = Vframe_list; CONSP (tail); tail = XCDR (tail))
{
Lisp_Object other_frame = XCAR (tail);
struct frame *tf = XFRAME (other_frame);
if (tf != f
&& FRAME_KBOARD (tf) == FRAME_KBOARD (f)
&& !FRAME_MINIBUF_ONLY_P (tf)
&& !EQ (other_frame, tip_frame)
&& (FRAME_VISIBLE_P (tf) || FRAME_ICONIFIED_P (tf)))
break;
}
/* Set global variable indicating that multiple frames exist. */
multiple_frames = CONSP (tail);
/* Switch to the buffer of selected window of the frame. Set up
mode_line_target so that display_mode_element will output into
mode_line_noprop_buf; then display the title. */
record_unwind_protect (unwind_format_mode_line,
format_mode_line_unwind_data
(current_buffer, selected_window, 0));
Fselect_window (f->selected_window, Qt);
set_buffer_internal_1 (XBUFFER (XWINDOW (f->selected_window)->buffer));
fmt = FRAME_ICONIFIED_P (f) ? Vicon_title_format : Vframe_title_format;
mode_line_target = MODE_LINE_TITLE;
title_start = MODE_LINE_NOPROP_LEN (0);
init_iterator (&it, XWINDOW (f->selected_window), -1, -1,
NULL, DEFAULT_FACE_ID);
display_mode_element (&it, 0, -1, -1, fmt, Qnil, 0);
len = MODE_LINE_NOPROP_LEN (title_start);
title = mode_line_noprop_buf + title_start;
unbind_to (count, Qnil);
/* Set the title only if it's changed. This avoids consing in
the common case where it hasn't. (If it turns out that we've
already wasted too much time by walking through the list with
display_mode_element, then we might need to optimize at a
higher level than this.) */
if (! STRINGP (f->name)
|| SBYTES (f->name) != len
|| bcmp (title, SDATA (f->name), len) != 0)
x_implicitly_set_name (f, make_string (title, len), Qnil);
}
}
#endif /* not HAVE_WINDOW_SYSTEM */
/***********************************************************************
Menu Bars
***********************************************************************/
/* Prepare for redisplay by updating menu-bar item lists when
appropriate. This can call eval. */
void
prepare_menu_bars ()
{
int all_windows;
struct gcpro gcpro1, gcpro2;
struct frame *f;
Lisp_Object tooltip_frame;
#ifdef HAVE_WINDOW_SYSTEM
tooltip_frame = tip_frame;
#else
tooltip_frame = Qnil;
#endif
/* Update all frame titles based on their buffer names, etc. We do
this before the menu bars so that the buffer-menu will show the
up-to-date frame titles. */
#ifdef HAVE_WINDOW_SYSTEM
if (windows_or_buffers_changed || update_mode_lines)
{
Lisp_Object tail, frame;
FOR_EACH_FRAME (tail, frame)
{
f = XFRAME (frame);
if (!EQ (frame, tooltip_frame)
&& (FRAME_VISIBLE_P (f) || FRAME_ICONIFIED_P (f)))
x_consider_frame_title (frame);
}
}
#endif /* HAVE_WINDOW_SYSTEM */
/* Update the menu bar item lists, if appropriate. This has to be
done before any actual redisplay or generation of display lines. */
all_windows = (update_mode_lines
|| buffer_shared > 1
|| windows_or_buffers_changed);
if (all_windows)
{
Lisp_Object tail, frame;
int count = SPECPDL_INDEX ();
/* 1 means that update_menu_bar has run its hooks
so any further calls to update_menu_bar shouldn't do so again. */
int menu_bar_hooks_run = 0;
record_unwind_save_match_data ();
FOR_EACH_FRAME (tail, frame)
{
f = XFRAME (frame);
/* Ignore tooltip frame. */
if (EQ (frame, tooltip_frame))
continue;
/* If a window on this frame changed size, report that to
the user and clear the size-change flag. */
if (FRAME_WINDOW_SIZES_CHANGED (f))
{
Lisp_Object functions;
/* Clear flag first in case we get an error below. */
FRAME_WINDOW_SIZES_CHANGED (f) = 0;
functions = Vwindow_size_change_functions;
GCPRO2 (tail, functions);
while (CONSP (functions))
{
if (!EQ (XCAR (functions), Qt))
call1 (XCAR (functions), frame);
functions = XCDR (functions);
}
UNGCPRO;
}
GCPRO1 (tail);
menu_bar_hooks_run = update_menu_bar (f, 0, menu_bar_hooks_run);
#ifdef HAVE_WINDOW_SYSTEM
update_tool_bar (f, 0);
#endif
#ifdef HAVE_NS
if (windows_or_buffers_changed
&& FRAME_NS_P (f))
ns_set_doc_edited (f, Fbuffer_modified_p
(XWINDOW (f->selected_window)->buffer));
#endif
UNGCPRO;
}
unbind_to (count, Qnil);
}
else
{
struct frame *sf = SELECTED_FRAME ();
update_menu_bar (sf, 1, 0);
#ifdef HAVE_WINDOW_SYSTEM
update_tool_bar (sf, 1);
#endif
}
/* Motif needs this. See comment in xmenu.c. Turn it off when
pending_menu_activation is not defined. */
#ifdef USE_X_TOOLKIT
pending_menu_activation = 0;
#endif
}
/* Update the menu bar item list for frame F. This has to be done
before we start to fill in any display lines, because it can call
eval.
If SAVE_MATCH_DATA is non-zero, we must save and restore it here.
If HOOKS_RUN is 1, that means a previous call to update_menu_bar
already ran the menu bar hooks for this redisplay, so there
is no need to run them again. The return value is the
updated value of this flag, to pass to the next call. */
static int
update_menu_bar (f, save_match_data, hooks_run)
struct frame *f;
int save_match_data;
int hooks_run;
{
Lisp_Object window;
register struct window *w;
/* If called recursively during a menu update, do nothing. This can
happen when, for instance, an activate-menubar-hook causes a
redisplay. */
if (inhibit_menubar_update)
return hooks_run;
window = FRAME_SELECTED_WINDOW (f);
w = XWINDOW (window);
if (FRAME_WINDOW_P (f)
?
#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) \
|| defined (HAVE_NS) || defined (USE_GTK)
FRAME_EXTERNAL_MENU_BAR (f)
#else
FRAME_MENU_BAR_LINES (f) > 0
#endif
: FRAME_MENU_BAR_LINES (f) > 0)
{
/* If the user has switched buffers or windows, we need to
recompute to reflect the new bindings. But we'll
recompute when update_mode_lines is set too; that means
that people can use force-mode-line-update to request
that the menu bar be recomputed. The adverse effect on
the rest of the redisplay algorithm is about the same as
windows_or_buffers_changed anyway. */
if (windows_or_buffers_changed
/* This used to test w->update_mode_line, but we believe
there is no need to recompute the menu in that case. */
|| update_mode_lines
|| ((BUF_SAVE_MODIFF (XBUFFER (w->buffer))
< BUF_MODIFF (XBUFFER (w->buffer)))
!= !NILP (w->last_had_star))
|| ((!NILP (Vtransient_mark_mode)
&& !NILP (XBUFFER (w->buffer)->mark_active))
!= !NILP (w->region_showing)))
{
struct buffer *prev = current_buffer;
int count = SPECPDL_INDEX ();
specbind (Qinhibit_menubar_update, Qt);
set_buffer_internal_1 (XBUFFER (w->buffer));
if (save_match_data)
record_unwind_save_match_data ();
if (NILP (Voverriding_local_map_menu_flag))
{
specbind (Qoverriding_terminal_local_map, Qnil);
specbind (Qoverriding_local_map, Qnil);
}
if (!hooks_run)
{
/* Run the Lucid hook. */
safe_run_hooks (Qactivate_menubar_hook);
/* If it has changed current-menubar from previous value,
really recompute the menu-bar from the value. */
if (! NILP (Vlucid_menu_bar_dirty_flag))
call0 (Qrecompute_lucid_menubar);
safe_run_hooks (Qmenu_bar_update_hook);
hooks_run = 1;
}
XSETFRAME (Vmenu_updating_frame, f);
FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));
/* Redisplay the menu bar in case we changed it. */
#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) \
|| defined (HAVE_NS) || defined (USE_GTK)
if (FRAME_WINDOW_P (f))
{
#if defined (HAVE_NS)
/* All frames on Mac OS share the same menubar. So only
the selected frame should be allowed to set it. */
if (f == SELECTED_FRAME ())
#endif
set_frame_menubar (f, 0, 0);
}
else
/* On a terminal screen, the menu bar is an ordinary screen
line, and this makes it get updated. */
w->update_mode_line = Qt;
#else /* ! (USE_X_TOOLKIT || HAVE_NTGUI || HAVE_NS || USE_GTK) */
/* In the non-toolkit version, the menu bar is an ordinary screen
line, and this makes it get updated. */
w->update_mode_line = Qt;
#endif /* ! (USE_X_TOOLKIT || HAVE_NTGUI || HAVE_NS || USE_GTK) */
unbind_to (count, Qnil);
set_buffer_internal_1 (prev);
}
}
return hooks_run;
}
/***********************************************************************
Output Cursor
***********************************************************************/
#ifdef HAVE_WINDOW_SYSTEM
/* EXPORT:
Nominal cursor position -- where to draw output.
HPOS and VPOS are window relative glyph matrix coordinates.
X and Y are window relative pixel coordinates. */
struct cursor_pos output_cursor;
/* EXPORT:
Set the global variable output_cursor to CURSOR. All cursor
positions are relative to updated_window. */
void
set_output_cursor (cursor)
struct cursor_pos *cursor;
{
output_cursor.hpos = cursor->hpos;
output_cursor.vpos = cursor->vpos;
output_cursor.x = cursor->x;
output_cursor.y = cursor->y;
}
/* EXPORT for RIF:
Set a nominal cursor position.
HPOS and VPOS are column/row positions in a window glyph matrix. X
and Y are window text area relative pixel positions.
If this is done during an update, updated_window will contain the
window that is being updated and the position is the future output
cursor position for that window. If updated_window is null, use
selected_window and display the cursor at the given position. */
void
x_cursor_to (vpos, hpos, y, x)
int vpos, hpos, y, x;
{
struct window *w;
/* If updated_window is not set, work on selected_window. */
if (updated_window)
w = updated_window;
else
w = XWINDOW (selected_window);
/* Set the output cursor. */
output_cursor.hpos = hpos;
output_cursor.vpos = vpos;
output_cursor.x = x;
output_cursor.y = y;
/* If not called as part of an update, really display the cursor.
This will also set the cursor position of W. */
if (updated_window == NULL)
{
BLOCK_INPUT;
display_and_set_cursor (w, 1, hpos, vpos, x, y);
if (FRAME_RIF (SELECTED_FRAME ())->flush_display_optional)
FRAME_RIF (SELECTED_FRAME ())->flush_display_optional (SELECTED_FRAME ());
UNBLOCK_INPUT;
}
}
#endif /* HAVE_WINDOW_SYSTEM */
/***********************************************************************
Tool-bars
***********************************************************************/
#ifdef HAVE_WINDOW_SYSTEM
/* Where the mouse was last time we reported a mouse event. */
FRAME_PTR last_mouse_frame;
/* Tool-bar item index of the item on which a mouse button was pressed
or -1. */
int last_tool_bar_item;
static Lisp_Object
update_tool_bar_unwind (frame)
Lisp_Object frame;
{
selected_frame = frame;
return Qnil;
}
/* Update the tool-bar item list for frame F. This has to be done
before we start to fill in any display lines. Called from
prepare_menu_bars. If SAVE_MATCH_DATA is non-zero, we must save
and restore it here. */
static void
update_tool_bar (f, save_match_data)
struct frame *f;
int save_match_data;
{
#if defined (USE_GTK) || defined (HAVE_NS)
int do_update = FRAME_EXTERNAL_TOOL_BAR (f);
#else
int do_update = WINDOWP (f->tool_bar_window)
&& WINDOW_TOTAL_LINES (XWINDOW (f->tool_bar_window)) > 0;
#endif
if (do_update)
{
Lisp_Object window;
struct window *w;
window = FRAME_SELECTED_WINDOW (f);
w = XWINDOW (window);
/* If the user has switched buffers or windows, we need to
recompute to reflect the new bindings. But we'll
recompute when update_mode_lines is set too; that means
that people can use force-mode-line-update to request
that the menu bar be recomputed. The adverse effect on
the rest of the redisplay algorithm is about the same as
windows_or_buffers_changed anyway. */
if (windows_or_buffers_changed
|| !NILP (w->update_mode_line)
|| update_mode_lines
|| ((BUF_SAVE_MODIFF (XBUFFER (w->buffer))
< BUF_MODIFF (XBUFFER (w->buffer)))
!= !NILP (w->last_had_star))
|| ((!NILP (Vtransient_mark_mode)
&& !NILP (XBUFFER (w->buffer)->mark_active))
!= !NILP (w->region_showing)))
{
struct buffer *prev = current_buffer;
int count = SPECPDL_INDEX ();
Lisp_Object frame, new_tool_bar;
int new_n_tool_bar;
struct gcpro gcpro1;
/* Set current_buffer to the buffer of the selected
window of the frame, so that we get the right local
keymaps. */
set_buffer_internal_1 (XBUFFER (w->buffer));
/* Save match data, if we must. */
if (save_match_data)
record_unwind_save_match_data ();
/* Make sure that we don't accidentally use bogus keymaps. */
if (NILP (Voverriding_local_map_menu_flag))
{
specbind (Qoverriding_terminal_local_map, Qnil);
specbind (Qoverriding_local_map, Qnil);
}
GCPRO1 (new_tool_bar);
/* We must temporarily set the selected frame to this frame
before calling tool_bar_items, because the calculation of
the tool-bar keymap uses the selected frame (see
`tool-bar-make-keymap' in tool-bar.el). */
record_unwind_protect (update_tool_bar_unwind, selected_frame);
XSETFRAME (frame, f);
selected_frame = frame;
/* Build desired tool-bar items from keymaps. */
new_tool_bar = tool_bar_items (Fcopy_sequence (f->tool_bar_items),
&new_n_tool_bar);
/* Redisplay the tool-bar if we changed it. */
if (new_n_tool_bar != f->n_tool_bar_items
|| NILP (Fequal (new_tool_bar, f->tool_bar_items)))
{
/* Redisplay that happens asynchronously due to an expose event
may access f->tool_bar_items. Make sure we update both
variables within BLOCK_INPUT so no such event interrupts. */
BLOCK_INPUT;
f->tool_bar_items = new_tool_bar;
f->n_tool_bar_items = new_n_tool_bar;
w->update_mode_line = Qt;
UNBLOCK_INPUT;
}
UNGCPRO;
unbind_to (count, Qnil);
set_buffer_internal_1 (prev);
}
}
}
/* Set F->desired_tool_bar_string to a Lisp string representing frame
F's desired tool-bar contents. F->tool_bar_items must have
been set up previously by calling prepare_menu_bars. */
static void
build_desired_tool_bar_string (f)
struct frame *f;
{
int i, size, size_needed;
struct gcpro gcpro1, gcpro2, gcpro3;
Lisp_Object image, plist, props;
image = plist = props = Qnil;
GCPRO3 (image, plist, props);
/* Prepare F->desired_tool_bar_string. If we can reuse it, do so.
Otherwise, make a new string. */
/* The size of the string we might be able to reuse. */
size = (STRINGP (f->desired_tool_bar_string)
? SCHARS (f->desired_tool_bar_string)
: 0);
/* We need one space in the string for each image. */
size_needed = f->n_tool_bar_items;
/* Reuse f->desired_tool_bar_string, if possible. */
if (size < size_needed || NILP (f->desired_tool_bar_string))
f->desired_tool_bar_string = Fmake_string (make_number (size_needed),
make_number (' '));
else
{
props = list4 (Qdisplay, Qnil, Qmenu_item, Qnil);
Fremove_text_properties (make_number (0), make_number (size),
props, f->desired_tool_bar_string);
}
/* Put a `display' property on the string for the images to display,
put a `menu_item' property on tool-bar items with a value that
is the index of the item in F's tool-bar item vector. */
for (i = 0; i < f->n_tool_bar_items; ++i)
{
#define PROP(IDX) AREF (f->tool_bar_items, i * TOOL_BAR_ITEM_NSLOTS + (IDX))
int enabled_p = !NILP (PROP (TOOL_BAR_ITEM_ENABLED_P));
int selected_p = !NILP (PROP (TOOL_BAR_ITEM_SELECTED_P));
int hmargin, vmargin, relief, idx, end;
extern Lisp_Object QCrelief, QCmargin, QCconversion;
/* If image is a vector, choose the image according to the
button state. */
image = PROP (TOOL_BAR_ITEM_IMAGES);
if (VECTORP (image))
{
if (enabled_p)
idx = (selected_p
? TOOL_BAR_IMAGE_ENABLED_SELECTED
: TOOL_BAR_IMAGE_ENABLED_DESELECTED);
else
idx = (selected_p
? TOOL_BAR_IMAGE_DISABLED_SELECTED
: TOOL_BAR_IMAGE_DISABLED_DESELECTED);
xassert (ASIZE (image) >= idx);
image = AREF (image, idx);
}
else
idx = -1;
/* Ignore invalid image specifications. */
if (!valid_image_p (image))
continue;
/* Display the tool-bar button pressed, or depressed. */
plist = Fcopy_sequence (XCDR (image));
/* Compute margin and relief to draw. */
relief = (tool_bar_button_relief >= 0
? tool_bar_button_relief
: DEFAULT_TOOL_BAR_BUTTON_RELIEF);
hmargin = vmargin = relief;
if (INTEGERP (Vtool_bar_button_margin)
&& XINT (Vtool_bar_button_margin) > 0)
{
hmargin += XFASTINT (Vtool_bar_button_margin);
vmargin += XFASTINT (Vtool_bar_button_margin);
}
else if (CONSP (Vtool_bar_button_margin))
{
if (INTEGERP (XCAR (Vtool_bar_button_margin))
&& XINT (XCAR (Vtool_bar_button_margin)) > 0)
hmargin += XFASTINT (XCAR (Vtool_bar_button_margin));
if (INTEGERP (XCDR (Vtool_bar_button_margin))
&& XINT (XCDR (Vtool_bar_button_margin)) > 0)
vmargin += XFASTINT (XCDR (Vtool_bar_button_margin));
}
if (auto_raise_tool_bar_buttons_p)
{
/* Add a `:relief' property to the image spec if the item is
selected. */
if (selected_p)
{
plist = Fplist_put (plist, QCrelief, make_number (-relief));
hmargin -= relief;
vmargin -= relief;
}
}
else
{
/* If image is selected, display it pressed, i.e. with a
negative relief. If it's not selected, display it with a
raised relief. */
plist = Fplist_put (plist, QCrelief,
(selected_p
? make_number (-relief)
: make_number (relief)));
hmargin -= relief;
vmargin -= relief;
}
/* Put a margin around the image. */
if (hmargin || vmargin)
{
if (hmargin == vmargin)
plist = Fplist_put (plist, QCmargin, make_number (hmargin));
else
plist = Fplist_put (plist, QCmargin,
Fcons (make_number (hmargin),
make_number (vmargin)));
}
/* If button is not enabled, and we don't have special images
for the disabled state, make the image appear disabled by
applying an appropriate algorithm to it. */
if (!enabled_p && idx < 0)
plist = Fplist_put (plist, QCconversion, Qdisabled);
/* Put a `display' text property on the string for the image to
display. Put a `menu-item' property on the string that gives
the start of this item's properties in the tool-bar items
vector. */
image = Fcons (Qimage, plist);
props = list4 (Qdisplay, image,
Qmenu_item, make_number (i * TOOL_BAR_ITEM_NSLOTS));
/* Let the last image hide all remaining spaces in the tool bar
string. The string can be longer than needed when we reuse a
previous string. */
if (i + 1 == f->n_tool_bar_items)
end = SCHARS (f->desired_tool_bar_string);
else
end = i + 1;
Fadd_text_properties (make_number (i), make_number (end),
props, f->desired_tool_bar_string);
#undef PROP
}
UNGCPRO;
}
/* Display one line of the tool-bar of frame IT->f.
HEIGHT specifies the desired height of the tool-bar line.
If the actual height of the glyph row is less than HEIGHT, the
row's height is increased to HEIGHT, and the icons are centered
vertically in the new height.
If HEIGHT is -1, we are counting needed tool-bar lines, so don't
count a final empty row in case the tool-bar width exactly matches
the window width.
*/
static void
display_tool_bar_line (it, height)
struct it *it;
int height;
{
struct glyph_row *row = it->glyph_row;
int max_x = it->last_visible_x;
struct glyph *last;
prepare_desired_row (row);
row->y = it->current_y;
/* Note that this isn't made use of if the face hasn't a box,
so there's no need to check the face here. */
it->start_of_box_run_p = 1;
while (it->current_x < max_x)
{
int x, n_glyphs_before, i, nglyphs;
struct it it_before;
/* Get the next display element. */
if (!get_next_display_element (it))
{
/* Don't count empty row if we are counting needed tool-bar lines. */
if (height < 0 && !it->hpos)
return;
break;
}
/* Produce glyphs. */
n_glyphs_before = row->used[TEXT_AREA];
it_before = *it;
PRODUCE_GLYPHS (it);
nglyphs = row->used[TEXT_AREA] - n_glyphs_before;
i = 0;
x = it_before.current_x;
while (i < nglyphs)
{
struct glyph *glyph = row->glyphs[TEXT_AREA] + n_glyphs_before + i;
if (x + glyph->pixel_width > max_x)
{
/* Glyph doesn't fit on line. Backtrack. */
row->used[TEXT_AREA] = n_glyphs_before;
*it = it_before;
/* If this is the only glyph on this line, it will never fit on the
toolbar, so skip it. But ensure there is at least one glyph,
so we don't accidentally disable the tool-bar. */
if (n_glyphs_before == 0
&& (it->vpos > 0 || IT_STRING_CHARPOS (*it) < it->end_charpos-1))
break;
goto out;
}
++it->hpos;
x += glyph->pixel_width;
++i;
}
/* Stop at line ends. */
if (ITERATOR_AT_END_OF_LINE_P (it))
break;
set_iterator_to_next (it, 1);
}
out:;
row->displays_text_p = row->used[TEXT_AREA] != 0;
/* Use default face for the border below the tool bar.
FIXME: When auto-resize-tool-bars is grow-only, there is
no additional border below the possibly empty tool-bar lines.
So to make the extra empty lines look "normal", we have to
use the tool-bar face for the border too. */
if (!row->displays_text_p && !EQ (Vauto_resize_tool_bars, Qgrow_only))
it->face_id = DEFAULT_FACE_ID;
extend_face_to_end_of_line (it);
last = row->glyphs[TEXT_AREA] + row->used[TEXT_AREA] - 1;
last->right_box_line_p = 1;
if (last == row->glyphs[TEXT_AREA])
last->left_box_line_p = 1;
/* Make line the desired height and center it vertically. */
if ((height -= it->max_ascent + it->max_descent) > 0)
{
/* Don't add more than one line height. */
height %= FRAME_LINE_HEIGHT (it->f);
it->max_ascent += height / 2;
it->max_descent += (height + 1) / 2;
}
compute_line_metrics (it);
/* If line is empty, make it occupy the rest of the tool-bar. */
if (!row->displays_text_p)
{
row->height = row->phys_height = it->last_visible_y - row->y;
row->visible_height = row->height;
row->ascent = row->phys_ascent = 0;
row->extra_line_spacing = 0;
}
row->full_width_p = 1;
row->continued_p = 0;
row->truncated_on_left_p = 0;
row->truncated_on_right_p = 0;
it->current_x = it->hpos = 0;
it->current_y += row->height;
++it->vpos;
++it->glyph_row;
}
/* Max tool-bar height. */
#define MAX_FRAME_TOOL_BAR_HEIGHT(f) \
((FRAME_LINE_HEIGHT (f) * FRAME_LINES (f)))
/* Value is the number of screen lines needed to make all tool-bar
items of frame F visible. The number of actual rows needed is
returned in *N_ROWS if non-NULL. */
static int
tool_bar_lines_needed (f, n_rows)
struct frame *f;
int *n_rows;
{
struct window *w = XWINDOW (f->tool_bar_window);
struct it it;
/* tool_bar_lines_needed is called from redisplay_tool_bar after building
the desired matrix, so use (unused) mode-line row as temporary row to
avoid destroying the first tool-bar row. */
struct glyph_row *temp_row = MATRIX_MODE_LINE_ROW (w->desired_matrix);
/* Initialize an iterator for iteration over
F->desired_tool_bar_string in the tool-bar window of frame F. */
init_iterator (&it, w, -1, -1, temp_row, TOOL_BAR_FACE_ID);
it.first_visible_x = 0;
it.last_visible_x = FRAME_TOTAL_COLS (f) * FRAME_COLUMN_WIDTH (f);
reseat_to_string (&it, NULL, f->desired_tool_bar_string, 0, 0, 0, -1);
while (!ITERATOR_AT_END_P (&it))
{
clear_glyph_row (temp_row);
it.glyph_row = temp_row;
display_tool_bar_line (&it, -1);
}
clear_glyph_row (temp_row);
/* f->n_tool_bar_rows == 0 means "unknown"; -1 means no tool-bar. */
if (n_rows)
*n_rows = it.vpos > 0 ? it.vpos : -1;
return (it.current_y + FRAME_LINE_HEIGHT (f) - 1) / FRAME_LINE_HEIGHT (f);
}
DEFUN ("tool-bar-lines-needed", Ftool_bar_lines_needed, Stool_bar_lines_needed,
0, 1, 0,
doc: /* Return the number of lines occupied by the tool bar of FRAME. */)
(frame)
Lisp_Object frame;
{
struct frame *f;
struct window *w;
int nlines = 0;
if (NILP (frame))
frame = selected_frame;
else
CHECK_FRAME (frame);
f = XFRAME (frame);
if (WINDOWP (f->tool_bar_window)
|| (w = XWINDOW (f->tool_bar_window),
WINDOW_TOTAL_LINES (w) > 0))
{
update_tool_bar (f, 1);
if (f->n_tool_bar_items)
{
build_desired_tool_bar_string (f);
nlines = tool_bar_lines_needed (f, NULL);
}
}
return make_number (nlines);
}
/* Display the tool-bar of frame F. Value is non-zero if tool-bar's
height should be changed. */
static int
redisplay_tool_bar (f)
struct frame *f;
{
struct window *w;
struct it it;
struct glyph_row *row;
#if defined (USE_GTK) || defined (HAVE_NS)
if (FRAME_EXTERNAL_TOOL_BAR (f))
update_frame_tool_bar (f);
return 0;
#endif
/* If frame hasn't a tool-bar window or if it is zero-height, don't
do anything. This means you must start with tool-bar-lines
non-zero to get the auto-sizing effect. Or in other words, you
can turn off tool-bars by specifying tool-bar-lines zero. */
if (!WINDOWP (f->tool_bar_window)
|| (w = XWINDOW (f->tool_bar_window),
WINDOW_TOTAL_LINES (w) == 0))
return 0;
/* Set up an iterator for the tool-bar window. */
init_iterator (&it, w, -1, -1, w->desired_matrix->rows, TOOL_BAR_FACE_ID);
it.first_visible_x = 0;
it.last_visible_x = FRAME_TOTAL_COLS (f) * FRAME_COLUMN_WIDTH (f);
row = it.glyph_row;
/* Build a string that represents the contents of the tool-bar. */
build_desired_tool_bar_string (f);
reseat_to_string (&it, NULL, f->desired_tool_bar_string, 0, 0, 0, -1);
if (f->n_tool_bar_rows == 0)
{
int nlines;
if ((nlines = tool_bar_lines_needed (f, &f->n_tool_bar_rows),
nlines != WINDOW_TOTAL_LINES (w)))
{
extern Lisp_Object Qtool_bar_lines;
Lisp_Object frame;
int old_height = WINDOW_TOTAL_LINES (w);
XSETFRAME (frame, f);
Fmodify_frame_parameters (frame,
Fcons (Fcons (Qtool_bar_lines,
make_number (nlines)),
Qnil));
if (WINDOW_TOTAL_LINES (w) != old_height)
{
clear_glyph_matrix (w->desired_matrix);
fonts_changed_p = 1;
return 1;
}
}
}
/* Display as many lines as needed to display all tool-bar items. */
if (f->n_tool_bar_rows > 0)
{
int border, rows, height, extra;
if (INTEGERP (Vtool_bar_border))
border = XINT (Vtool_bar_border);
else if (EQ (Vtool_bar_border, Qinternal_border_width))
border = FRAME_INTERNAL_BORDER_WIDTH (f);
else if (EQ (Vtool_bar_border, Qborder_width))
border = f->border_width;
else
border = 0;
if (border < 0)
border = 0;
rows = f->n_tool_bar_rows;
height = max (1, (it.last_visible_y - border) / rows);
extra = it.last_visible_y - border - height * rows;
while (it.current_y < it.last_visible_y)
{
int h = 0;
if (extra > 0 && rows-- > 0)
{
h = (extra + rows - 1) / rows;
extra -= h;
}
display_tool_bar_line (&it, height + h);
}
}
else
{
while (it.current_y < it.last_visible_y)
display_tool_bar_line (&it, 0);
}
/* It doesn't make much sense to try scrolling in the tool-bar
window, so don't do it. */
w->desired_matrix->no_scrolling_p = 1;
w->must_be_updated_p = 1;
if (!NILP (Vauto_resize_tool_bars))
{
int max_tool_bar_height = MAX_FRAME_TOOL_BAR_HEIGHT (f);
int change_height_p = 0;
/* If we couldn't display everything, change the tool-bar's
height if there is room for more. */
if (IT_STRING_CHARPOS (it) < it.end_charpos
&& it.current_y < max_tool_bar_height)
change_height_p = 1;
row = it.glyph_row - 1;
/* If there are blank lines at the end, except for a partially
visible blank line at the end that is smaller than
FRAME_LINE_HEIGHT, change the tool-bar's height. */
if (!row->displays_text_p
&& row->height >= FRAME_LINE_HEIGHT (f))
change_height_p = 1;
/* If row displays tool-bar items, but is partially visible,
change the tool-bar's height. */
if (row->displays_text_p
&& MATRIX_ROW_BOTTOM_Y (row) > it.last_visible_y
&& MATRIX_ROW_BOTTOM_Y (row) < max_tool_bar_height)
change_height_p = 1;
/* Resize windows as needed by changing the `tool-bar-lines'
frame parameter. */
if (change_height_p)
{
extern Lisp_Object Qtool_bar_lines;
Lisp_Object frame;
int old_height = WINDOW_TOTAL_LINES (w);
int nrows;
int nlines = tool_bar_lines_needed (f, &nrows);
change_height_p = ((EQ (Vauto_resize_tool_bars, Qgrow_only)
&& !f->minimize_tool_bar_window_p)
? (nlines > old_height)
: (nlines != old_height));
f->minimize_tool_bar_window_p = 0;
if (change_height_p)
{
XSETFRAME (frame, f);
Fmodify_frame_parameters (frame,
Fcons (Fcons (Qtool_bar_lines,
make_number (nlines)),
Qnil));
if (WINDOW_TOTAL_LINES (w) != old_height)
{
clear_glyph_matrix (w->desired_matrix);
f->n_tool_bar_rows = nrows;
fonts_changed_p = 1;
return 1;
}
}
}
}
f->minimize_tool_bar_window_p = 0;
return 0;
}
/* Get information about the tool-bar item which is displayed in GLYPH
on frame F. Return in *PROP_IDX the index where tool-bar item
properties start in F->tool_bar_items. Value is zero if
GLYPH doesn't display a tool-bar item. */
static int
tool_bar_item_info (f, glyph, prop_idx)
struct frame *f;
struct glyph *glyph;
int *prop_idx;
{
Lisp_Object prop;
int success_p;
int charpos;
/* This function can be called asynchronously, which means we must
exclude any possibility that Fget_text_property signals an
error. */
charpos = min (SCHARS (f->current_tool_bar_string), glyph->charpos);
charpos = max (0, charpos);
/* Get the text property `menu-item' at pos. The value of that
property is the start index of this item's properties in
F->tool_bar_items. */
prop = Fget_text_property (make_number (charpos),
Qmenu_item, f->current_tool_bar_string);
if (INTEGERP (prop))
{
*prop_idx = XINT (prop);
success_p = 1;
}
else
success_p = 0;
return success_p;
}
/* Get information about the tool-bar item at position X/Y on frame F.
Return in *GLYPH a pointer to the glyph of the tool-bar item in
the current matrix of the tool-bar window of F, or NULL if not
on a tool-bar item. Return in *PROP_IDX the index of the tool-bar
item in F->tool_bar_items. Value is
-1 if X/Y is not on a tool-bar item
0 if X/Y is on the same item that was highlighted before.
1 otherwise. */
static int
get_tool_bar_item (f, x, y, glyph, hpos, vpos, prop_idx)
struct frame *f;
int x, y;
struct glyph **glyph;
int *hpos, *vpos, *prop_idx;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
struct window *w = XWINDOW (f->tool_bar_window);
int area;
/* Find the glyph under X/Y. */
*glyph = x_y_to_hpos_vpos (w, x, y, hpos, vpos, 0, 0, &area);
if (*glyph == NULL)
return -1;
/* Get the start of this tool-bar item's properties in
f->tool_bar_items. */
if (!tool_bar_item_info (f, *glyph, prop_idx))
return -1;
/* Is mouse on the highlighted item? */
if (EQ (f->tool_bar_window, dpyinfo->mouse_face_window)
&& *vpos >= dpyinfo->mouse_face_beg_row
&& *vpos <= dpyinfo->mouse_face_end_row
&& (*vpos > dpyinfo->mouse_face_beg_row
|| *hpos >= dpyinfo->mouse_face_beg_col)
&& (*vpos < dpyinfo->mouse_face_end_row
|| *hpos < dpyinfo->mouse_face_end_col
|| dpyinfo->mouse_face_past_end))
return 0;
return 1;
}
/* EXPORT:
Handle mouse button event on the tool-bar of frame F, at
frame-relative coordinates X/Y. DOWN_P is 1 for a button press,
0 for button release. MODIFIERS is event modifiers for button
release. */
void
handle_tool_bar_click (f, x, y, down_p, modifiers)
struct frame *f;
int x, y, down_p;
unsigned int modifiers;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
struct window *w = XWINDOW (f->tool_bar_window);
int hpos, vpos, prop_idx;
struct glyph *glyph;
Lisp_Object enabled_p;
/* If not on the highlighted tool-bar item, return. */
frame_to_window_pixel_xy (w, &x, &y);
if (get_tool_bar_item (f, x, y, &glyph, &hpos, &vpos, &prop_idx) != 0)
return;
/* If item is disabled, do nothing. */
enabled_p = AREF (f->tool_bar_items, prop_idx + TOOL_BAR_ITEM_ENABLED_P);
if (NILP (enabled_p))
return;
if (down_p)
{
/* Show item in pressed state. */
show_mouse_face (dpyinfo, DRAW_IMAGE_SUNKEN);
dpyinfo->mouse_face_image_state = DRAW_IMAGE_SUNKEN;
last_tool_bar_item = prop_idx;
}
else
{
Lisp_Object key, frame;
struct input_event event;
EVENT_INIT (event);
/* Show item in released state. */
show_mouse_face (dpyinfo, DRAW_IMAGE_RAISED);
dpyinfo->mouse_face_image_state = DRAW_IMAGE_RAISED;
key = AREF (f->tool_bar_items, prop_idx + TOOL_BAR_ITEM_KEY);
XSETFRAME (frame, f);
event.kind = TOOL_BAR_EVENT;
event.frame_or_window = frame;
event.arg = frame;
kbd_buffer_store_event (&event);
event.kind = TOOL_BAR_EVENT;
event.frame_or_window = frame;
event.arg = key;
event.modifiers = modifiers;
kbd_buffer_store_event (&event);
last_tool_bar_item = -1;
}
}
/* Possibly highlight a tool-bar item on frame F when mouse moves to
tool-bar window-relative coordinates X/Y. Called from
note_mouse_highlight. */
static void
note_tool_bar_highlight (f, x, y)
struct frame *f;
int x, y;
{
Lisp_Object window = f->tool_bar_window;
struct window *w = XWINDOW (window);
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
int hpos, vpos;
struct glyph *glyph;
struct glyph_row *row;
int i;
Lisp_Object enabled_p;
int prop_idx;
enum draw_glyphs_face draw = DRAW_IMAGE_RAISED;
int mouse_down_p, rc;
/* Function note_mouse_highlight is called with negative x(y
values when mouse moves outside of the frame. */
if (x <= 0 || y <= 0)
{
clear_mouse_face (dpyinfo);
return;
}
rc = get_tool_bar_item (f, x, y, &glyph, &hpos, &vpos, &prop_idx);
if (rc < 0)
{
/* Not on tool-bar item. */
clear_mouse_face (dpyinfo);
return;
}
else if (rc == 0)
/* On same tool-bar item as before. */
goto set_help_echo;
clear_mouse_face (dpyinfo);
/* Mouse is down, but on different tool-bar item? */
mouse_down_p = (dpyinfo->grabbed
&& f == last_mouse_frame
&& FRAME_LIVE_P (f));
if (mouse_down_p
&& last_tool_bar_item != prop_idx)
return;
dpyinfo->mouse_face_image_state = DRAW_NORMAL_TEXT;
draw = mouse_down_p ? DRAW_IMAGE_SUNKEN : DRAW_IMAGE_RAISED;
/* If tool-bar item is not enabled, don't highlight it. */
enabled_p = AREF (f->tool_bar_items, prop_idx + TOOL_BAR_ITEM_ENABLED_P);
if (!NILP (enabled_p))
{
/* Compute the x-position of the glyph. In front and past the
image is a space. We include this in the highlighted area. */
row = MATRIX_ROW (w->current_matrix, vpos);
for (i = x = 0; i < hpos; ++i)
x += row->glyphs[TEXT_AREA][i].pixel_width;
/* Record this as the current active region. */
dpyinfo->mouse_face_beg_col = hpos;
dpyinfo->mouse_face_beg_row = vpos;
dpyinfo->mouse_face_beg_x = x;
dpyinfo->mouse_face_beg_y = row->y;
dpyinfo->mouse_face_past_end = 0;
dpyinfo->mouse_face_end_col = hpos + 1;
dpyinfo->mouse_face_end_row = vpos;
dpyinfo->mouse_face_end_x = x + glyph->pixel_width;
dpyinfo->mouse_face_end_y = row->y;
dpyinfo->mouse_face_window = window;
dpyinfo->mouse_face_face_id = TOOL_BAR_FACE_ID;
/* Display it as active. */
show_mouse_face (dpyinfo, draw);
dpyinfo->mouse_face_image_state = draw;
}
set_help_echo:
/* Set help_echo_string to a help string to display for this tool-bar item.
XTread_socket does the rest. */
help_echo_object = help_echo_window = Qnil;
help_echo_pos = -1;
help_echo_string = AREF (f->tool_bar_items, prop_idx + TOOL_BAR_ITEM_HELP);
if (NILP (help_echo_string))
help_echo_string = AREF (f->tool_bar_items, prop_idx + TOOL_BAR_ITEM_CAPTION);
}
#endif /* HAVE_WINDOW_SYSTEM */
/************************************************************************
Horizontal scrolling
************************************************************************/
static int hscroll_window_tree P_ ((Lisp_Object));
static int hscroll_windows P_ ((Lisp_Object));
/* For all leaf windows in the window tree rooted at WINDOW, set their
hscroll value so that PT is (i) visible in the window, and (ii) so
that it is not within a certain margin at the window's left and
right border. Value is non-zero if any window's hscroll has been
changed. */
static int
hscroll_window_tree (window)
Lisp_Object window;
{
int hscrolled_p = 0;
int hscroll_relative_p = FLOATP (Vhscroll_step);
int hscroll_step_abs = 0;
double hscroll_step_rel = 0;
if (hscroll_relative_p)
{
hscroll_step_rel = XFLOAT_DATA (Vhscroll_step);
if (hscroll_step_rel < 0)
{
hscroll_relative_p = 0;
hscroll_step_abs = 0;
}
}
else if (INTEGERP (Vhscroll_step))
{
hscroll_step_abs = XINT (Vhscroll_step);
if (hscroll_step_abs < 0)
hscroll_step_abs = 0;
}
else
hscroll_step_abs = 0;
while (WINDOWP (window))
{
struct window *w = XWINDOW (window);
if (WINDOWP (w->hchild))
hscrolled_p |= hscroll_window_tree (w->hchild);
else if (WINDOWP (w->vchild))
hscrolled_p |= hscroll_window_tree (w->vchild);
else if (w->cursor.vpos >= 0)
{
int h_margin;
int text_area_width;
struct glyph_row *current_cursor_row
= MATRIX_ROW (w->current_matrix, w->cursor.vpos);
struct glyph_row *desired_cursor_row
= MATRIX_ROW (w->desired_matrix, w->cursor.vpos);
struct glyph_row *cursor_row
= (desired_cursor_row->enabled_p
? desired_cursor_row
: current_cursor_row);
text_area_width = window_box_width (w, TEXT_AREA);
/* Scroll when cursor is inside this scroll margin. */
h_margin = hscroll_margin * WINDOW_FRAME_COLUMN_WIDTH (w);
if (!NILP (Fbuffer_local_value (Qauto_hscroll_mode, w->buffer))
&& ((XFASTINT (w->hscroll)
&& w->cursor.x <= h_margin)
|| (cursor_row->enabled_p
&& cursor_row->truncated_on_right_p
&& (w->cursor.x >= text_area_width - h_margin))))
{
struct it it;
int hscroll;
struct buffer *saved_current_buffer;
int pt;
int wanted_x;
/* Find point in a display of infinite width. */
saved_current_buffer = current_buffer;
current_buffer = XBUFFER (w->buffer);
if (w == XWINDOW (selected_window))
pt = BUF_PT (current_buffer);
else
{
pt = marker_position (w->pointm);
pt = max (BEGV, pt);
pt = min (ZV, pt);
}
/* Move iterator to pt starting at cursor_row->start in
a line with infinite width. */
init_to_row_start (&it, w, cursor_row);
it.last_visible_x = INFINITY;
move_it_in_display_line_to (&it, pt, -1, MOVE_TO_POS);
current_buffer = saved_current_buffer;
/* Position cursor in window. */
if (!hscroll_relative_p && hscroll_step_abs == 0)
hscroll = max (0, (it.current_x
- (ITERATOR_AT_END_OF_LINE_P (&it)
? (text_area_width - 4 * FRAME_COLUMN_WIDTH (it.f))
: (text_area_width / 2))))
/ FRAME_COLUMN_WIDTH (it.f);
else if (w->cursor.x >= text_area_width - h_margin)
{
if (hscroll_relative_p)
wanted_x = text_area_width * (1 - hscroll_step_rel)
- h_margin;
else
wanted_x = text_area_width
- hscroll_step_abs * FRAME_COLUMN_WIDTH (it.f)
- h_margin;
hscroll
= max (0, it.current_x - wanted_x) / FRAME_COLUMN_WIDTH (it.f);
}
else
{
if (hscroll_relative_p)
wanted_x = text_area_width * hscroll_step_rel
+ h_margin;
else
wanted_x = hscroll_step_abs * FRAME_COLUMN_WIDTH (it.f)
+ h_margin;
hscroll
= max (0, it.current_x - wanted_x) / FRAME_COLUMN_WIDTH (it.f);
}
hscroll = max (hscroll, XFASTINT (w->min_hscroll));
/* Don't call Fset_window_hscroll if value hasn't
changed because it will prevent redisplay
optimizations. */
if (XFASTINT (w->hscroll) != hscroll)
{
XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
w->hscroll = make_number (hscroll);
hscrolled_p = 1;
}
}
}
window = w->next;
}
/* Value is non-zero if hscroll of any leaf window has been changed. */
return hscrolled_p;
}
/* Set hscroll so that cursor is visible and not inside horizontal
scroll margins for all windows in the tree rooted at WINDOW. See
also hscroll_window_tree above. Value is non-zero if any window's
hscroll has been changed. If it has, desired matrices on the frame
of WINDOW are cleared. */
static int
hscroll_windows (window)
Lisp_Object window;
{
int hscrolled_p = hscroll_window_tree (window);
if (hscrolled_p)
clear_desired_matrices (XFRAME (WINDOW_FRAME (XWINDOW (window))));
return hscrolled_p;
}
/************************************************************************
Redisplay
************************************************************************/
/* Variables holding some state of redisplay if GLYPH_DEBUG is defined
to a non-zero value. This is sometimes handy to have in a debugger
session. */
#if GLYPH_DEBUG
/* First and last unchanged row for try_window_id. */
int debug_first_unchanged_at_end_vpos;
int debug_last_unchanged_at_beg_vpos;
/* Delta vpos and y. */
int debug_dvpos, debug_dy;
/* Delta in characters and bytes for try_window_id. */
int debug_delta, debug_delta_bytes;
/* Values of window_end_pos and window_end_vpos at the end of
try_window_id. */
EMACS_INT debug_end_pos, debug_end_vpos;
/* Append a string to W->desired_matrix->method. FMT is a printf
format string. A1...A9 are a supplement for a variable-length
argument list. If trace_redisplay_p is non-zero also printf the
resulting string to stderr. */
static void
debug_method_add (w, fmt, a1, a2, a3, a4, a5, a6, a7, a8, a9)
struct window *w;
char *fmt;
int a1, a2, a3, a4, a5, a6, a7, a8, a9;
{
char buffer[512];
char *method = w->desired_matrix->method;
int len = strlen (method);
int size = sizeof w->desired_matrix->method;
int remaining = size - len - 1;
sprintf (buffer, fmt, a1, a2, a3, a4, a5, a6, a7, a8, a9);
if (len && remaining)
{
method[len] = '|';
--remaining, ++len;
}
strncpy (method + len, buffer, remaining);
if (trace_redisplay_p)
fprintf (stderr, "%p (%s): %s\n",
w,
((BUFFERP (w->buffer)
&& STRINGP (XBUFFER (w->buffer)->name))
? (char *) SDATA (XBUFFER (w->buffer)->name)
: "no buffer"),
buffer);
}
#endif /* GLYPH_DEBUG */
/* Value is non-zero if all changes in window W, which displays
current_buffer, are in the text between START and END. START is a
buffer position, END is given as a distance from Z. Used in
redisplay_internal for display optimization. */
static INLINE int
text_outside_line_unchanged_p (w, start, end)
struct window *w;
int start, end;
{
int unchanged_p = 1;
/* If text or overlays have changed, see where. */
if (XFASTINT (w->last_modified) < MODIFF
|| XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF)
{
/* Gap in the line? */
if (GPT < start || Z - GPT < end)
unchanged_p = 0;
/* Changes start in front of the line, or end after it? */
if (unchanged_p
&& (BEG_UNCHANGED < start - 1
|| END_UNCHANGED < end))
unchanged_p = 0;
/* If selective display, can't optimize if changes start at the
beginning of the line. */
if (unchanged_p
&& INTEGERP (current_buffer->selective_display)
&& XINT (current_buffer->selective_display) > 0
&& (BEG_UNCHANGED < start || GPT <= start))
unchanged_p = 0;
/* If there are overlays at the start or end of the line, these
may have overlay strings with newlines in them. A change at
START, for instance, may actually concern the display of such
overlay strings as well, and they are displayed on different
lines. So, quickly rule out this case. (For the future, it
might be desirable to implement something more telling than
just BEG/END_UNCHANGED.) */
if (unchanged_p)
{
if (BEG + BEG_UNCHANGED == start
&& overlay_touches_p (start))
unchanged_p = 0;
if (END_UNCHANGED == end
&& overlay_touches_p (Z - end))
unchanged_p = 0;
}
}
return unchanged_p;
}
/* Do a frame update, taking possible shortcuts into account. This is
the main external entry point for redisplay.
If the last redisplay displayed an echo area message and that message
is no longer requested, we clear the echo area or bring back the
mini-buffer if that is in use. */
void
redisplay ()
{
redisplay_internal (0);
}
static Lisp_Object
overlay_arrow_string_or_property (var)
Lisp_Object var;
{
Lisp_Object val;
if (val = Fget (var, Qoverlay_arrow_string), STRINGP (val))
return val;
return Voverlay_arrow_string;
}
/* Return 1 if there are any overlay-arrows in current_buffer. */
static int
overlay_arrow_in_current_buffer_p ()
{
Lisp_Object vlist;
for (vlist = Voverlay_arrow_variable_list;
CONSP (vlist);
vlist = XCDR (vlist))
{
Lisp_Object var = XCAR (vlist);
Lisp_Object val;
if (!SYMBOLP (var))
continue;
val = find_symbol_value (var);
if (MARKERP (val)
&& current_buffer == XMARKER (val)->buffer)
return 1;
}
return 0;
}
/* Return 1 if any overlay_arrows have moved or overlay-arrow-string
has changed. */
static int
overlay_arrows_changed_p ()
{
Lisp_Object vlist;
for (vlist = Voverlay_arrow_variable_list;
CONSP (vlist);
vlist = XCDR (vlist))
{
Lisp_Object var = XCAR (vlist);
Lisp_Object val, pstr;
if (!SYMBOLP (var))
continue;
val = find_symbol_value (var);
if (!MARKERP (val))
continue;
if (! EQ (COERCE_MARKER (val),
Fget (var, Qlast_arrow_position))
|| ! (pstr = overlay_arrow_string_or_property (var),
EQ (pstr, Fget (var, Qlast_arrow_string))))
return 1;
}
return 0;
}
/* Mark overlay arrows to be updated on next redisplay. */
static void
update_overlay_arrows (up_to_date)
int up_to_date;
{
Lisp_Object vlist;
for (vlist = Voverlay_arrow_variable_list;
CONSP (vlist);
vlist = XCDR (vlist))
{
Lisp_Object var = XCAR (vlist);
if (!SYMBOLP (var))
continue;
if (up_to_date > 0)
{
Lisp_Object val = find_symbol_value (var);
Fput (var, Qlast_arrow_position,
COERCE_MARKER (val));
Fput (var, Qlast_arrow_string,
overlay_arrow_string_or_property (var));
}
else if (up_to_date < 0
|| !NILP (Fget (var, Qlast_arrow_position)))
{
Fput (var, Qlast_arrow_position, Qt);
Fput (var, Qlast_arrow_string, Qt);
}
}
}
/* Return overlay arrow string to display at row.
Return integer (bitmap number) for arrow bitmap in left fringe.
Return nil if no overlay arrow. */
static Lisp_Object
overlay_arrow_at_row (it, row)
struct it *it;
struct glyph_row *row;
{
Lisp_Object vlist;
for (vlist = Voverlay_arrow_variable_list;
CONSP (vlist);
vlist = XCDR (vlist))
{
Lisp_Object var = XCAR (vlist);
Lisp_Object val;
if (!SYMBOLP (var))
continue;
val = find_symbol_value (var);
if (MARKERP (val)
&& current_buffer == XMARKER (val)->buffer
&& (MATRIX_ROW_START_CHARPOS (row) == marker_position (val)))
{
if (FRAME_WINDOW_P (it->f)
&& WINDOW_LEFT_FRINGE_WIDTH (it->w) > 0)
{
#ifdef HAVE_WINDOW_SYSTEM
if (val = Fget (var, Qoverlay_arrow_bitmap), SYMBOLP (val))
{
int fringe_bitmap;
if ((fringe_bitmap = lookup_fringe_bitmap (val)) != 0)
return make_number (fringe_bitmap);
}
#endif
return make_number (-1); /* Use default arrow bitmap */
}
return overlay_arrow_string_or_property (var);
}
}
return Qnil;
}
/* Return 1 if point moved out of or into a composition. Otherwise
return 0. PREV_BUF and PREV_PT are the last point buffer and
position. BUF and PT are the current point buffer and position. */
int
check_point_in_composition (prev_buf, prev_pt, buf, pt)
struct buffer *prev_buf, *buf;
int prev_pt, pt;
{
EMACS_INT start, end;
Lisp_Object prop;
Lisp_Object buffer;
XSETBUFFER (buffer, buf);
/* Check a composition at the last point if point moved within the
same buffer. */
if (prev_buf == buf)
{
if (prev_pt == pt)
/* Point didn't move. */
return 0;
if (prev_pt > BUF_BEGV (buf) && prev_pt < BUF_ZV (buf)
&& find_composition (prev_pt, -1, &start, &end, &prop, buffer)
&& COMPOSITION_VALID_P (start, end, prop)
&& start < prev_pt && end > prev_pt)
/* The last point was within the composition. Return 1 iff
point moved out of the composition. */
return (pt <= start || pt >= end);
}
/* Check a composition at the current point. */
return (pt > BUF_BEGV (buf) && pt < BUF_ZV (buf)
&& find_composition (pt, -1, &start, &end, &prop, buffer)
&& COMPOSITION_VALID_P (start, end, prop)
&& start < pt && end > pt);
}
/* Reconsider the setting of B->clip_changed which is displayed
in window W. */
static INLINE void
reconsider_clip_changes (w, b)
struct window *w;
struct buffer *b;
{
if (b->clip_changed
&& !NILP (w->window_end_valid)
&& w->current_matrix->buffer == b
&& w->current_matrix->zv == BUF_ZV (b)
&& w->current_matrix->begv == BUF_BEGV (b))
b->clip_changed = 0;
/* If display wasn't paused, and W is not a tool bar window, see if
point has been moved into or out of a composition. In that case,
we set b->clip_changed to 1 to force updating the screen. If
b->clip_changed has already been set to 1, we can skip this
check. */
if (!b->clip_changed
&& BUFFERP (w->buffer) && !NILP (w->window_end_valid))
{
int pt;
if (w == XWINDOW (selected_window))
pt = BUF_PT (current_buffer);
else
pt = marker_position (w->pointm);
if ((w->current_matrix->buffer != XBUFFER (w->buffer)
|| pt != XINT (w->last_point))
&& check_point_in_composition (w->current_matrix->buffer,
XINT (w->last_point),
XBUFFER (w->buffer), pt))
b->clip_changed = 1;
}
}
/* Select FRAME to forward the values of frame-local variables into C
variables so that the redisplay routines can access those values
directly. */
static void
select_frame_for_redisplay (frame)
Lisp_Object frame;
{
Lisp_Object tail, symbol, val;
Lisp_Object old = selected_frame;
struct Lisp_Symbol *sym;
xassert (FRAMEP (frame) && FRAME_LIVE_P (XFRAME (frame)));
selected_frame = frame;
do
{
for (tail = XFRAME (frame)->param_alist; CONSP (tail); tail = XCDR (tail))
if (CONSP (XCAR (tail))
&& (symbol = XCAR (XCAR (tail)),
SYMBOLP (symbol))
&& (sym = indirect_variable (XSYMBOL (symbol)),
val = sym->value,
(BUFFER_LOCAL_VALUEP (val)))
&& XBUFFER_LOCAL_VALUE (val)->check_frame)
/* Use find_symbol_value rather than Fsymbol_value
to avoid an error if it is void. */
find_symbol_value (symbol);
} while (!EQ (frame, old) && (frame = old, 1));
}
#define STOP_POLLING \
do { if (! polling_stopped_here) stop_polling (); \
polling_stopped_here = 1; } while (0)
#define RESUME_POLLING \
do { if (polling_stopped_here) start_polling (); \
polling_stopped_here = 0; } while (0)
/* If PRESERVE_ECHO_AREA is nonzero, it means this redisplay is not in
response to any user action; therefore, we should preserve the echo
area. (Actually, our caller does that job.) Perhaps in the future
avoid recentering windows if it is not necessary; currently that
causes some problems. */
static void
redisplay_internal (preserve_echo_area)
int preserve_echo_area;
{
struct window *w = XWINDOW (selected_window);
struct frame *f;
int pause;
int must_finish = 0;
struct text_pos tlbufpos, tlendpos;
int number_of_visible_frames;
int count, count1;
struct frame *sf;
int polling_stopped_here = 0;
Lisp_Object old_frame = selected_frame;
/* Non-zero means redisplay has to consider all windows on all
frames. Zero means, only selected_window is considered. */
int consider_all_windows_p;
TRACE ((stderr, "redisplay_internal %d\n", redisplaying_p));
/* No redisplay if running in batch mode or frame is not yet fully
initialized, or redisplay is explicitly turned off by setting
Vinhibit_redisplay. */
if (FRAME_INITIAL_P (SELECTED_FRAME ())
|| !NILP (Vinhibit_redisplay))
return;
/* Don't examine these until after testing Vinhibit_redisplay.
When Emacs is shutting down, perhaps because its connection to
X has dropped, we should not look at them at all. */
f = XFRAME (w->frame);
sf = SELECTED_FRAME ();
if (!f->glyphs_initialized_p)
return;
/* The flag redisplay_performed_directly_p is set by
direct_output_for_insert when it already did the whole screen
update necessary. */
if (redisplay_performed_directly_p)
{
redisplay_performed_directly_p = 0;
if (!hscroll_windows (selected_window))
return;
}
#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NS)
if (popup_activated ())
return;
#endif
/* I don't think this happens but let's be paranoid. */
if (redisplaying_p)
return;
/* Record a function that resets redisplaying_p to its old value
when we leave this function. */
count = SPECPDL_INDEX ();
record_unwind_protect (unwind_redisplay,
Fcons (make_number (redisplaying_p), selected_frame));
++redisplaying_p;
specbind (Qinhibit_free_realized_faces, Qnil);
{
Lisp_Object tail, frame;
FOR_EACH_FRAME (tail, frame)
{
struct frame *f = XFRAME (frame);
f->already_hscrolled_p = 0;
}
}
retry:
if (!EQ (old_frame, selected_frame)
&& FRAME_LIVE_P (XFRAME (old_frame)))
/* When running redisplay, we play a bit fast-and-loose and allow e.g.
selected_frame and selected_window to be temporarily out-of-sync so
when we come back here via `goto retry', we need to resync because we
may need to run Elisp code (via prepare_menu_bars). */
select_frame_for_redisplay (old_frame);
pause = 0;
reconsider_clip_changes (w, current_buffer);
last_escape_glyph_frame = NULL;
last_escape_glyph_face_id = (1 << FACE_ID_BITS);
/* If new fonts have been loaded that make a glyph matrix adjustment
necessary, do it. */
if (fonts_changed_p)
{
adjust_glyphs (NULL);
++windows_or_buffers_changed;
fonts_changed_p = 0;
}
/* If face_change_count is non-zero, init_iterator will free all
realized faces, which includes the faces referenced from current
matrices. So, we can't reuse current matrices in this case. */
if (face_change_count)
++windows_or_buffers_changed;
if ((FRAME_TERMCAP_P (sf) || FRAME_MSDOS_P (sf))
&& FRAME_TTY (sf)->previous_frame != sf)
{
/* Since frames on a single ASCII terminal share the same
display area, displaying a different frame means redisplay
the whole thing. */
windows_or_buffers_changed++;
SET_FRAME_GARBAGED (sf);
#ifndef DOS_NT
set_tty_color_mode (FRAME_TTY (sf), sf);
#endif
FRAME_TTY (sf)->previous_frame = sf;
}
/* Set the visible flags for all frames. Do this before checking
for resized or garbaged frames; they want to know if their frames
are visible. See the comment in frame.h for
FRAME_SAMPLE_VISIBILITY. */
{
Lisp_Object tail, frame;
number_of_visible_frames = 0;
FOR_EACH_FRAME (tail, frame)
{
struct frame *f = XFRAME (frame);
FRAME_SAMPLE_VISIBILITY (f);
if (FRAME_VISIBLE_P (f))
++number_of_visible_frames;
clear_desired_matrices (f);
}
}
/* Notice any pending interrupt request to change frame size. */
do_pending_window_change (1);
/* Clear frames marked as garbaged. */
if (frame_garbaged)
clear_garbaged_frames ();
/* Build menubar and tool-bar items. */
if (NILP (Vmemory_full))
prepare_menu_bars ();
if (windows_or_buffers_changed)
update_mode_lines++;
/* Detect case that we need to write or remove a star in the mode line. */
if ((SAVE_MODIFF < MODIFF) != !NILP (w->last_had_star))
{
w->update_mode_line = Qt;
if (buffer_shared > 1)
update_mode_lines++;
}
/* Avoid invocation of point motion hooks by `current_column' below. */
count1 = SPECPDL_INDEX ();
specbind (Qinhibit_point_motion_hooks, Qt);
/* If %c is in the mode line, update it if needed. */
if (!NILP (w->column_number_displayed)
/* This alternative quickly identifies a common case
where no change is needed. */
&& !(PT == XFASTINT (w->last_point)
&& XFASTINT (w->last_modified) >= MODIFF
&& XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)
&& (XFASTINT (w->column_number_displayed)
!= (int) current_column ())) /* iftc */
w->update_mode_line = Qt;
unbind_to (count1, Qnil);
FRAME_SCROLL_BOTTOM_VPOS (XFRAME (w->frame)) = -1;
/* The variable buffer_shared is set in redisplay_window and
indicates that we redisplay a buffer in different windows. See
there. */
consider_all_windows_p = (update_mode_lines || buffer_shared > 1
|| cursor_type_changed);
/* If specs for an arrow have changed, do thorough redisplay
to ensure we remove any arrow that should no longer exist. */
if (overlay_arrows_changed_p ())
consider_all_windows_p = windows_or_buffers_changed = 1;
/* Normally the message* functions will have already displayed and
updated the echo area, but the frame may have been trashed, or
the update may have been preempted, so display the echo area
again here. Checking message_cleared_p captures the case that
the echo area should be cleared. */
if ((!NILP (echo_area_buffer[0]) && !display_last_displayed_message_p)
|| (!NILP (echo_area_buffer[1]) && display_last_displayed_message_p)
|| (message_cleared_p
&& minibuf_level == 0
/* If the mini-window is currently selected, this means the
echo-area doesn't show through. */
&& !MINI_WINDOW_P (XWINDOW (selected_window))))
{
int window_height_changed_p = echo_area_display (0);
must_finish = 1;
/* If we don't display the current message, don't clear the
message_cleared_p flag, because, if we did, we wouldn't clear
the echo area in the next redisplay which doesn't preserve
the echo area. */
if (!display_last_displayed_message_p)
message_cleared_p = 0;
if (fonts_changed_p)
goto retry;
else if (window_height_changed_p)
{
consider_all_windows_p = 1;
++update_mode_lines;
++windows_or_buffers_changed;
/* If window configuration was changed, frames may have been
marked garbaged. Clear them or we will experience
surprises wrt scrolling. */
if (frame_garbaged)
clear_garbaged_frames ();
}
}
else if (EQ (selected_window, minibuf_window)
&& (current_buffer->clip_changed
|| XFASTINT (w->last_modified) < MODIFF
|| XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF)
&& resize_mini_window (w, 0))
{
/* Resized active mini-window to fit the size of what it is
showing if its contents might have changed. */
must_finish = 1;
/* FIXME: this causes all frames to be updated, which seems unnecessary
since only the current frame needs to be considered. This function needs
to be rewritten with two variables, consider_all_windows and
consider_all_frames. */
consider_all_windows_p = 1;
++windows_or_buffers_changed;
++update_mode_lines;
/* If window configuration was changed, frames may have been
marked garbaged. Clear them or we will experience
surprises wrt scrolling. */
if (frame_garbaged)
clear_garbaged_frames ();
}
/* If showing the region, and mark has changed, we must redisplay
the whole window. The assignment to this_line_start_pos prevents
the optimization directly below this if-statement. */
if (((!NILP (Vtransient_mark_mode)
&& !NILP (XBUFFER (w->buffer)->mark_active))
!= !NILP (w->region_showing))
|| (!NILP (w->region_showing)
&& !EQ (w->region_showing,
Fmarker_position (XBUFFER (w->buffer)->mark))))
CHARPOS (this_line_start_pos) = 0;
/* Optimize the case that only the line containing the cursor in the
selected window has changed. Variables starting with this_ are
set in display_line and record information about the line
containing the cursor. */
tlbufpos = this_line_start_pos;
tlendpos = this_line_end_pos;
if (!consider_all_windows_p
&& CHARPOS (tlbufpos) > 0
&& NILP (w->update_mode_line)
&& !current_buffer->clip_changed
&& !current_buffer->prevent_redisplay_optimizations_p
&& FRAME_VISIBLE_P (XFRAME (w->frame))
&& !FRAME_OBSCURED_P (XFRAME (w->frame))
/* Make sure recorded data applies to current buffer, etc. */
&& this_line_buffer == current_buffer
&& current_buffer == XBUFFER (w->buffer)
&& NILP (w->force_start)
&& NILP (w->optional_new_start)
/* Point must be on the line that we have info recorded about. */
&& PT >= CHARPOS (tlbufpos)
&& PT <= Z - CHARPOS (tlendpos)
/* All text outside that line, including its final newline,
must be unchanged. */
&& text_outside_line_unchanged_p (w, CHARPOS (tlbufpos),
CHARPOS (tlendpos)))
{
if (CHARPOS (tlbufpos) > BEGV
&& FETCH_BYTE (BYTEPOS (tlbufpos) - 1) != '\n'
&& (CHARPOS (tlbufpos) == ZV
|| FETCH_BYTE (BYTEPOS (tlbufpos)) == '\n'))
/* Former continuation line has disappeared by becoming empty. */
goto cancel;
else if (XFASTINT (w->last_modified) < MODIFF
|| XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF
|| MINI_WINDOW_P (w))
{
/* We have to handle the case of continuation around a
wide-column character (see the comment in indent.c around
line 1340).
For instance, in the following case:
-------- Insert --------
K_A_N_\\ `a' K_A_N_a\ `X_' are wide-column chars.
J_I_ ==> J_I_ `^^' are cursors.
^^ ^^
-------- --------
As we have to redraw the line above, we cannot use this
optimization. */
struct it it;
int line_height_before = this_line_pixel_height;
/* Note that start_display will handle the case that the
line starting at tlbufpos is a continuation line. */
start_display (&it, w, tlbufpos);
/* Implementation note: It this still necessary? */
if (it.current_x != this_line_start_x)
goto cancel;
TRACE ((stderr, "trying display optimization 1\n"));
w->cursor.vpos = -1;
overlay_arrow_seen = 0;
it.vpos = this_line_vpos;
it.current_y = this_line_y;
it.glyph_row = MATRIX_ROW (w->desired_matrix, this_line_vpos);
display_line (&it);
/* If line contains point, is not continued,
and ends at same distance from eob as before, we win. */
if (w->cursor.vpos >= 0
/* Line is not continued, otherwise this_line_start_pos
would have been set to 0 in display_line. */
&& CHARPOS (this_line_start_pos)
/* Line ends as before. */
&& CHARPOS (this_line_end_pos) == CHARPOS (tlendpos)
/* Line has same height as before. Otherwise other lines
would have to be shifted up or down. */
&& this_line_pixel_height == line_height_before)
{
/* If this is not the window's last line, we must adjust
the charstarts of the lines below. */
if (it.current_y < it.last_visible_y)
{
struct glyph_row *row
= MATRIX_ROW (w->current_matrix, this_line_vpos + 1);
int delta, delta_bytes;
/* We used to distinguish between two cases here,
conditioned by Z - CHARPOS (tlendpos) == ZV, for
when the line ends in a newline or the end of the
buffer's accessible portion. But both cases did
the same, so they were collapsed. */
delta = (Z
- CHARPOS (tlendpos)
- MATRIX_ROW_START_CHARPOS (row));
delta_bytes = (Z_BYTE
- BYTEPOS (tlendpos)
- MATRIX_ROW_START_BYTEPOS (row));
increment_matrix_positions (w->current_matrix,
this_line_vpos + 1,
w->current_matrix->nrows,
delta, delta_bytes);
}
/* If this row displays text now but previously didn't,
or vice versa, w->window_end_vpos may have to be
adjusted. */
if ((it.glyph_row - 1)->displays_text_p)
{
if (XFASTINT (w->window_end_vpos) < this_line_vpos)
XSETINT (w->window_end_vpos, this_line_vpos);
}
else if (XFASTINT (w->window_end_vpos) == this_line_vpos
&& this_line_vpos > 0)
XSETINT (w->window_end_vpos, this_line_vpos - 1);
w->window_end_valid = Qnil;
/* Update hint: No need to try to scroll in update_window. */
w->desired_matrix->no_scrolling_p = 1;
#if GLYPH_DEBUG
*w->desired_matrix->method = 0;
debug_method_add (w, "optimization 1");
#endif
#ifdef HAVE_WINDOW_SYSTEM
update_window_fringes (w, 0);
#endif
goto update;
}
else
goto cancel;
}
else if (/* Cursor position hasn't changed. */
PT == XFASTINT (w->last_point)
/* Make sure the cursor was last displayed
in this window. Otherwise we have to reposition it. */
&& 0 <= w->cursor.vpos
&& WINDOW_TOTAL_LINES (w) > w->cursor.vpos)
{
if (!must_finish)
{
do_pending_window_change (1);
/* We used to always goto end_of_redisplay here, but this
isn't enough if we have a blinking cursor. */
if (w->cursor_off_p == w->last_cursor_off_p)
goto end_of_redisplay;
}
goto update;
}
/* If highlighting the region, or if the cursor is in the echo area,
then we can't just move the cursor. */
else if (! (!NILP (Vtransient_mark_mode)
&& !NILP (current_buffer->mark_active))
&& (EQ (selected_window, current_buffer->last_selected_window)
|| highlight_nonselected_windows)
&& NILP (w->region_showing)
&& NILP (Vshow_trailing_whitespace)
&& !cursor_in_echo_area)
{
struct it it;
struct glyph_row *row;
/* Skip from tlbufpos to PT and see where it is. Note that
PT may be in invisible text. If so, we will end at the
next visible position. */
init_iterator (&it, w, CHARPOS (tlbufpos), BYTEPOS (tlbufpos),
NULL, DEFAULT_FACE_ID);
it.current_x = this_line_start_x;
it.current_y = this_line_y;
it.vpos = this_line_vpos;
/* The call to move_it_to stops in front of PT, but
moves over before-strings. */
move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS);
if (it.vpos == this_line_vpos
&& (row = MATRIX_ROW (w->current_matrix, this_line_vpos),
row->enabled_p))
{
xassert (this_line_vpos == it.vpos);
xassert (this_line_y == it.current_y);
set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0);
#if GLYPH_DEBUG
*w->desired_matrix->method = 0;
debug_method_add (w, "optimization 3");
#endif
goto update;
}
else
goto cancel;
}
cancel:
/* Text changed drastically or point moved off of line. */
SET_MATRIX_ROW_ENABLED_P (w->desired_matrix, this_line_vpos, 0);
}
CHARPOS (this_line_start_pos) = 0;
consider_all_windows_p |= buffer_shared > 1;
++clear_face_cache_count;
#ifdef HAVE_WINDOW_SYSTEM
++clear_image_cache_count;
#endif
/* Build desired matrices, and update the display. If
consider_all_windows_p is non-zero, do it for all windows on all
frames. Otherwise do it for selected_window, only. */
if (consider_all_windows_p)
{
Lisp_Object tail, frame;
FOR_EACH_FRAME (tail, frame)
XFRAME (frame)->updated_p = 0;
/* Recompute # windows showing selected buffer. This will be
incremented each time such a window is displayed. */
buffer_shared = 0;
FOR_EACH_FRAME (tail, frame)
{
struct frame *f = XFRAME (frame);
if (FRAME_WINDOW_P (f) || FRAME_TERMCAP_P (f) || f == sf)
{
if (! EQ (frame, selected_frame))
/* Select the frame, for the sake of frame-local
variables. */
select_frame_for_redisplay (frame);
/* Mark all the scroll bars to be removed; we'll redeem
the ones we want when we redisplay their windows. */
if (FRAME_TERMINAL (f)->condemn_scroll_bars_hook)
FRAME_TERMINAL (f)->condemn_scroll_bars_hook (f);
if (FRAME_VISIBLE_P (f) && !FRAME_OBSCURED_P (f))
redisplay_windows (FRAME_ROOT_WINDOW (f));
/* The X error handler may have deleted that frame. */
if (!FRAME_LIVE_P (f))
continue;
/* Any scroll bars which redisplay_windows should have
nuked should now go away. */
if (FRAME_TERMINAL (f)->judge_scroll_bars_hook)
FRAME_TERMINAL (f)->judge_scroll_bars_hook (f);
/* If fonts changed, display again. */
/* ??? rms: I suspect it is a mistake to jump all the way
back to retry here. It should just retry this frame. */
if (fonts_changed_p)
goto retry;
if (FRAME_VISIBLE_P (f) && !FRAME_OBSCURED_P (f))
{
/* See if we have to hscroll. */
if (!f->already_hscrolled_p)
{
f->already_hscrolled_p = 1;
if (hscroll_windows (f->root_window))
goto retry;
}
/* Prevent various kinds of signals during display
update. stdio is not robust about handling
signals, which can cause an apparent I/O
error. */
if (interrupt_input)
unrequest_sigio ();
STOP_POLLING;
/* Update the display. */
set_window_update_flags (XWINDOW (f->root_window), 1);
pause |= update_frame (f, 0, 0);
f->updated_p = 1;
}
}
}
if (!EQ (old_frame, selected_frame)
&& FRAME_LIVE_P (XFRAME (old_frame)))
/* We played a bit fast-and-loose above and allowed selected_frame
and selected_window to be temporarily out-of-sync but let's make
sure this stays contained. */
select_frame_for_redisplay (old_frame);
eassert (EQ (XFRAME (selected_frame)->selected_window, selected_window));
if (!pause)
{
/* Do the mark_window_display_accurate after all windows have
been redisplayed because this call resets flags in buffers
which are needed for proper redisplay. */
FOR_EACH_FRAME (tail, frame)
{
struct frame *f = XFRAME (frame);
if (f->updated_p)
{
mark_window_display_accurate (f->root_window, 1);
if (FRAME_TERMINAL (f)->frame_up_to_date_hook)
FRAME_TERMINAL (f)->frame_up_to_date_hook (f);
}
}
}
}
else if (FRAME_VISIBLE_P (sf) && !FRAME_OBSCURED_P (sf))
{
Lisp_Object mini_window;
struct frame *mini_frame;
displayed_buffer = XBUFFER (XWINDOW (selected_window)->buffer);
/* Use list_of_error, not Qerror, so that
we catch only errors and don't run the debugger. */
internal_condition_case_1 (redisplay_window_1, selected_window,
list_of_error,
redisplay_window_error);
/* Compare desired and current matrices, perform output. */
update:
/* If fonts changed, display again. */
if (fonts_changed_p)
goto retry;
/* Prevent various kinds of signals during display update.
stdio is not robust about handling signals,
which can cause an apparent I/O error. */
if (interrupt_input)
unrequest_sigio ();
STOP_POLLING;
if (FRAME_VISIBLE_P (sf) && !FRAME_OBSCURED_P (sf))
{
if (hscroll_windows (selected_window))
goto retry;
XWINDOW (selected_window)->must_be_updated_p = 1;
pause = update_frame (sf, 0, 0);
}
/* We may have called echo_area_display at the top of this
function. If the echo area is on another frame, that may
have put text on a frame other than the selected one, so the
above call to update_frame would not have caught it. Catch
it here. */
mini_window = FRAME_MINIBUF_WINDOW (sf);
mini_frame = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
if (mini_frame != sf && FRAME_WINDOW_P (mini_frame))
{
XWINDOW (mini_window)->must_be_updated_p = 1;
pause |= update_frame (mini_frame, 0, 0);
if (!pause && hscroll_windows (mini_window))
goto retry;
}
}
/* If display was paused because of pending input, make sure we do a
thorough update the next time. */
if (pause)
{
/* Prevent the optimization at the beginning of
redisplay_internal that tries a single-line update of the
line containing the cursor in the selected window. */
CHARPOS (this_line_start_pos) = 0;
/* Let the overlay arrow be updated the next time. */
update_overlay_arrows (0);
/* If we pause after scrolling, some rows in the current
matrices of some windows are not valid. */
if (!WINDOW_FULL_WIDTH_P (w)
&& !FRAME_WINDOW_P (XFRAME (w->frame)))
update_mode_lines = 1;
}
else
{
if (!consider_all_windows_p)
{
/* This has already been done above if
consider_all_windows_p is set. */
mark_window_display_accurate_1 (w, 1);
/* Say overlay arrows are up to date. */
update_overlay_arrows (1);
if (FRAME_TERMINAL (sf)->frame_up_to_date_hook != 0)
FRAME_TERMINAL (sf)->frame_up_to_date_hook (sf);
}
update_mode_lines = 0;
windows_or_buffers_changed = 0;
cursor_type_changed = 0;
}
/* Start SIGIO interrupts coming again. Having them off during the
code above makes it less likely one will discard output, but not
impossible, since there might be stuff in the system buffer here.
But it is much hairier to try to do anything about that. */
if (interrupt_input)
request_sigio ();
RESUME_POLLING;
/* If a frame has become visible which was not before, redisplay
again, so that we display it. Expose events for such a frame
(which it gets when becoming visible) don't call the parts of
redisplay constructing glyphs, so simply exposing a frame won't
display anything in this case. So, we have to display these
frames here explicitly. */
if (!pause)
{
Lisp_Object tail, frame;
int new_count = 0;
FOR_EACH_FRAME (tail, frame)
{
int this_is_visible = 0;
if (XFRAME (frame)->visible)
this_is_visible = 1;
FRAME_SAMPLE_VISIBILITY (XFRAME (frame));
if (XFRAME (frame)->visible)
this_is_visible = 1;
if (this_is_visible)
new_count++;
}
if (new_count != number_of_visible_frames)
windows_or_buffers_changed++;
}
/* Change frame size now if a change is pending. */
do_pending_window_change (1);
/* If we just did a pending size change, or have additional
visible frames, redisplay again. */
if (windows_or_buffers_changed && !pause)
goto retry;
/* Clear the face cache eventually. */
if (consider_all_windows_p)
{
if (clear_face_cache_count > CLEAR_FACE_CACHE_COUNT)
{
clear_face_cache (0);
clear_face_cache_count = 0;
}
#ifdef HAVE_WINDOW_SYSTEM
if (clear_image_cache_count > CLEAR_IMAGE_CACHE_COUNT)
{
clear_image_caches (Qnil);
clear_image_cache_count = 0;
}
#endif /* HAVE_WINDOW_SYSTEM */
}
end_of_redisplay:
unbind_to (count, Qnil);
RESUME_POLLING;
}
/* Redisplay, but leave alone any recent echo area message unless
another message has been requested in its place.
This is useful in situations where you need to redisplay but no
user action has occurred, making it inappropriate for the message
area to be cleared. See tracking_off and
wait_reading_process_output for examples of these situations.
FROM_WHERE is an integer saying from where this function was
called. This is useful for debugging. */
void
redisplay_preserve_echo_area (from_where)
int from_where;
{
TRACE ((stderr, "redisplay_preserve_echo_area (%d)\n", from_where));
if (!NILP (echo_area_buffer[1]))
{
/* We have a previously displayed message, but no current
message. Redisplay the previous message. */
display_last_displayed_message_p = 1;
redisplay_internal (1);
display_last_displayed_message_p = 0;
}
else
redisplay_internal (1);
if (FRAME_RIF (SELECTED_FRAME ()) != NULL
&& FRAME_RIF (SELECTED_FRAME ())->flush_display_optional)
FRAME_RIF (SELECTED_FRAME ())->flush_display_optional (NULL);
}
/* Function registered with record_unwind_protect in
redisplay_internal. Reset redisplaying_p to the value it had
before redisplay_internal was called, and clear
prevent_freeing_realized_faces_p. It also selects the previously
selected frame, unless it has been deleted (by an X connection
failure during redisplay, for example). */
static Lisp_Object
unwind_redisplay (val)
Lisp_Object val;
{
Lisp_Object old_redisplaying_p, old_frame;
old_redisplaying_p = XCAR (val);
redisplaying_p = XFASTINT (old_redisplaying_p);
old_frame = XCDR (val);
if (! EQ (old_frame, selected_frame)
&& FRAME_LIVE_P (XFRAME (old_frame)))
select_frame_for_redisplay (old_frame);
return Qnil;
}
/* Mark the display of window W as accurate or inaccurate. If
ACCURATE_P is non-zero mark display of W as accurate. If
ACCURATE_P is zero, arrange for W to be redisplayed the next time
redisplay_internal is called. */
static void
mark_window_display_accurate_1 (w, accurate_p)
struct window *w;
int accurate_p;
{
if (BUFFERP (w->buffer))
{
struct buffer *b = XBUFFER (w->buffer);
w->last_modified
= make_number (accurate_p ? BUF_MODIFF (b) : 0);
w->last_overlay_modified
= make_number (accurate_p ? BUF_OVERLAY_MODIFF (b) : 0);
w->last_had_star
= BUF_MODIFF (b) > BUF_SAVE_MODIFF (b) ? Qt : Qnil;
if (accurate_p)
{
b->clip_changed = 0;
b->prevent_redisplay_optimizations_p = 0;
BUF_UNCHANGED_MODIFIED (b) = BUF_MODIFF (b);
BUF_OVERLAY_UNCHANGED_MODIFIED (b) = BUF_OVERLAY_MODIFF (b);
BUF_BEG_UNCHANGED (b) = BUF_GPT (b) - BUF_BEG (b);
BUF_END_UNCHANGED (b) = BUF_Z (b) - BUF_GPT (b);
w->current_matrix->buffer = b;
w->current_matrix->begv = BUF_BEGV (b);
w->current_matrix->zv = BUF_ZV (b);
w->last_cursor = w->cursor;
w->last_cursor_off_p = w->cursor_off_p;
if (w == XWINDOW (selected_window))
w->last_point = make_number (BUF_PT (b));
else
w->last_point = make_number (XMARKER (w->pointm)->charpos);
}
}
if (accurate_p)
{
w->window_end_valid = w->buffer;
w->update_mode_line = Qnil;
}
}
/* Mark the display of windows in the window tree rooted at WINDOW as
accurate or inaccurate. If ACCURATE_P is non-zero mark display of
windows as accurate. If ACCURATE_P is zero, arrange for windows to
be redisplayed the next time redisplay_internal is called. */
void
mark_window_display_accurate (window, accurate_p)
Lisp_Object window;
int accurate_p;
{
struct window *w;
for (; !NILP (window); window = w->next)
{
w = XWINDOW (window);
mark_window_display_accurate_1 (w, accurate_p);
if (!NILP (w->vchild))
mark_window_display_accurate (w->vchild, accurate_p);
if (!NILP (w->hchild))
mark_window_display_accurate (w->hchild, accurate_p);
}
if (accurate_p)
{
update_overlay_arrows (1);
}
else
{
/* Force a thorough redisplay the next time by setting
last_arrow_position and last_arrow_string to t, which is
unequal to any useful value of Voverlay_arrow_... */
update_overlay_arrows (-1);
}
}
/* Return value in display table DP (Lisp_Char_Table *) for character
C. Since a display table doesn't have any parent, we don't have to
follow parent. Do not call this function directly but use the
macro DISP_CHAR_VECTOR. */
Lisp_Object
disp_char_vector (dp, c)
struct Lisp_Char_Table *dp;
int c;
{
Lisp_Object val;
if (ASCII_CHAR_P (c))
{
val = dp->ascii;
if (SUB_CHAR_TABLE_P (val))
val = XSUB_CHAR_TABLE (val)->contents[c];
}
else
{
Lisp_Object table;
XSETCHAR_TABLE (table, dp);
val = char_table_ref (table, c);
}
if (NILP (val))
val = dp->defalt;
return val;
}
/***********************************************************************
Window Redisplay
***********************************************************************/
/* Redisplay all leaf windows in the window tree rooted at WINDOW. */
static void
redisplay_windows (window)
Lisp_Object window;
{
while (!NILP (window))
{
struct window *w = XWINDOW (window);
if (!NILP (w->hchild))
redisplay_windows (w->hchild);
else if (!NILP (w->vchild))
redisplay_windows (w->vchild);
else if (!NILP (w->buffer))
{
displayed_buffer = XBUFFER (w->buffer);
/* Use list_of_error, not Qerror, so that
we catch only errors and don't run the debugger. */
internal_condition_case_1 (redisplay_window_0, window,
list_of_error,
redisplay_window_error);
}
window = w->next;
}
}
static Lisp_Object
redisplay_window_error ()
{
displayed_buffer->display_error_modiff = BUF_MODIFF (displayed_buffer);
return Qnil;
}
static Lisp_Object
redisplay_window_0 (window)
Lisp_Object window;
{
if (displayed_buffer->display_error_modiff < BUF_MODIFF (displayed_buffer))
redisplay_window (window, 0);
return Qnil;
}
static Lisp_Object
redisplay_window_1 (window)
Lisp_Object window;
{
if (displayed_buffer->display_error_modiff < BUF_MODIFF (displayed_buffer))
redisplay_window (window, 1);
return Qnil;
}
/* Increment GLYPH until it reaches END or CONDITION fails while
adding (GLYPH)->pixel_width to X. */
#define SKIP_GLYPHS(glyph, end, x, condition) \
do \
{ \
(x) += (glyph)->pixel_width; \
++(glyph); \
} \
while ((glyph) < (end) && (condition))
/* Set cursor position of W. PT is assumed to be displayed in ROW.
DELTA and DELTA_BYTES are the numbers of characters and bytes by
which positions recorded in ROW differ from current buffer
positions.
Return 0 if cursor is not on this row, 1 otherwise. */
int
set_cursor_from_row (w, row, matrix, delta, delta_bytes, dy, dvpos)
struct window *w;
struct glyph_row *row;
struct glyph_matrix *matrix;
int delta, delta_bytes, dy, dvpos;
{
struct glyph *glyph = row->glyphs[TEXT_AREA];
struct glyph *end = glyph + row->used[TEXT_AREA];
struct glyph *cursor = NULL;
/* The first glyph that starts a sequence of glyphs from a string
that is a value of a display property. */
struct glyph *string_start;
/* The X coordinate of string_start. */
int string_start_x;
/* The last known character position in row. */
int last_pos = MATRIX_ROW_START_CHARPOS (row) + delta;
/* The last known character position before string_start. */
int string_before_pos;
int x = row->x;
int cursor_x = x;
/* Last buffer position covered by an overlay. */
int cursor_from_overlay_pos = 0;
int pt_old = PT - delta;
/* Skip over glyphs not having an object at the start of the row.
These are special glyphs like truncation marks on terminal
frames. */
if (row->displays_text_p)
while (glyph < end
&& INTEGERP (glyph->object)
&& glyph->charpos < 0)
{
x += glyph->pixel_width;
++glyph;
}
string_start = NULL;
while (glyph < end
&& !INTEGERP (glyph->object)
&& (!BUFFERP (glyph->object)
|| (last_pos = glyph->charpos) < pt_old
|| glyph->avoid_cursor_p))
{
if (! STRINGP (glyph->object))
{
string_start = NULL;
x += glyph->pixel_width;
++glyph;
/* If we are beyond the cursor position computed from the
last overlay seen, that overlay is not in effect for
current cursor position. Reset the cursor information
computed from that overlay. */
if (cursor_from_overlay_pos
&& last_pos >= cursor_from_overlay_pos)
{
cursor_from_overlay_pos = 0;
cursor = NULL;
}
}
else
{
if (string_start == NULL)
{
string_before_pos = last_pos;
string_start = glyph;
string_start_x = x;
}
/* Skip all glyphs from a string. */
do
{
Lisp_Object cprop;
int pos;
if ((cursor == NULL || glyph > cursor)
&& (cprop = Fget_char_property (make_number ((glyph)->charpos),
Qcursor, (glyph)->object),
!NILP (cprop))
&& (pos = string_buffer_position (w, glyph->object,
string_before_pos),
(pos == 0 /* from overlay */
|| pos == pt_old)))
{
/* Compute the first buffer position after the overlay.
If the `cursor' property tells us how many positions
are associated with the overlay, use that. Otherwise,
estimate from the buffer positions of the glyphs
before and after the overlay. */
cursor_from_overlay_pos = (pos ? 0 : last_pos
+ (INTEGERP (cprop) ? XINT (cprop) : 0));
cursor = glyph;
cursor_x = x;
}
x += glyph->pixel_width;
++glyph;
}
while (glyph < end && EQ (glyph->object, string_start->object));
}
}
if (cursor != NULL)
{
glyph = cursor;
x = cursor_x;
}
else if (row->ends_in_ellipsis_p && glyph == end)
{
/* Scan back over the ellipsis glyphs, decrementing positions. */
while (glyph > row->glyphs[TEXT_AREA]
&& (glyph - 1)->charpos == last_pos)
glyph--, x -= glyph->pixel_width;
/* That loop always goes one position too far, including the
glyph before the ellipsis. So scan forward over that one. */
x += glyph->pixel_width;
glyph++;
}
else if (string_start
&& (glyph == end || !BUFFERP (glyph->object) || last_pos > pt_old))
{
/* We may have skipped over point because the previous glyphs
are from string. As there's no easy way to know the
character position of the current glyph, find the correct
glyph on point by scanning from string_start again. */
Lisp_Object limit;
Lisp_Object string;
struct glyph *stop = glyph;
int pos;
limit = make_number (pt_old + 1);
glyph = string_start;
x = string_start_x;
string = glyph->object;
pos = string_buffer_position (w, string, string_before_pos);
/* If POS == 0, STRING is from overlay. We skip such glyphs
because we always put the cursor after overlay strings. */
while (pos == 0 && glyph < stop)
{
string = glyph->object;
SKIP_GLYPHS (glyph, stop, x, EQ (glyph->object, string));
if (glyph < stop)
pos = string_buffer_position (w, glyph->object, string_before_pos);
}
while (glyph < stop)
{
pos = XINT (Fnext_single_char_property_change
(make_number (pos), Qdisplay, Qnil, limit));
if (pos > pt_old)
break;
/* Skip glyphs from the same string. */
string = glyph->object;
SKIP_GLYPHS (glyph, stop, x, EQ (glyph->object, string));
/* Skip glyphs from an overlay. */
while (glyph < stop
&& ! string_buffer_position (w, glyph->object, pos))
{
string = glyph->object;
SKIP_GLYPHS (glyph, stop, x, EQ (glyph->object, string));
}
}
/* If we reached the end of the line, and END was from a string,
the cursor is not on this line. */
if (glyph == end && row->continued_p)
return 0;
}
w->cursor.hpos = glyph - row->glyphs[TEXT_AREA];
w->cursor.x = x;
w->cursor.vpos = MATRIX_ROW_VPOS (row, matrix) + dvpos;
w->cursor.y = row->y + dy;
if (w == XWINDOW (selected_window))
{
if (!row->continued_p
&& !MATRIX_ROW_CONTINUATION_LINE_P (row)
&& row->x == 0)
{
this_line_buffer = XBUFFER (w->buffer);
CHARPOS (this_line_start_pos)
= MATRIX_ROW_START_CHARPOS (row) + delta;
BYTEPOS (this_line_start_pos)
= MATRIX_ROW_START_BYTEPOS (row) + delta_bytes;
CHARPOS (this_line_end_pos)
= Z - (MATRIX_ROW_END_CHARPOS (row) + delta);
BYTEPOS (this_line_end_pos)
= Z_BYTE - (MATRIX_ROW_END_BYTEPOS (row) + delta_bytes);
this_line_y = w->cursor.y;
this_line_pixel_height = row->height;
this_line_vpos = w->cursor.vpos;
this_line_start_x = row->x;
}
else
CHARPOS (this_line_start_pos) = 0;
}
return 1;
}
/* Run window scroll functions, if any, for WINDOW with new window
start STARTP. Sets the window start of WINDOW to that position.
We assume that the window's buffer is really current. */
static INLINE struct text_pos
run_window_scroll_functions (window, startp)
Lisp_Object window;
struct text_pos startp;
{
struct window *w = XWINDOW (window);
SET_MARKER_FROM_TEXT_POS (w->start, startp);
if (current_buffer != XBUFFER (w->buffer))
abort ();
if (!NILP (Vwindow_scroll_functions))
{
run_hook_with_args_2 (Qwindow_scroll_functions, window,
make_number (CHARPOS (startp)));
SET_TEXT_POS_FROM_MARKER (startp, w->start);
/* In case the hook functions switch buffers. */
if (current_buffer != XBUFFER (w->buffer))
set_buffer_internal_1 (XBUFFER (w->buffer));
}
return startp;
}
/* Make sure the line containing the cursor is fully visible.
A value of 1 means there is nothing to be done.
(Either the line is fully visible, or it cannot be made so,
or we cannot tell.)
If FORCE_P is non-zero, return 0 even if partial visible cursor row
is higher than window.
A value of 0 means the caller should do scrolling
as if point had gone off the screen. */
static int
cursor_row_fully_visible_p (w, force_p, current_matrix_p)
struct window *w;
int force_p;
int current_matrix_p;
{
struct glyph_matrix *matrix;
struct glyph_row *row;
int window_height;
if (!make_cursor_line_fully_visible_p)
return 1;
/* It's not always possible to find the cursor, e.g, when a window
is full of overlay strings. Don't do anything in that case. */
if (w->cursor.vpos < 0)
return 1;
matrix = current_matrix_p ? w->current_matrix : w->desired_matrix;
row = MATRIX_ROW (matrix, w->cursor.vpos);
/* If the cursor row is not partially visible, there's nothing to do. */
if (!MATRIX_ROW_PARTIALLY_VISIBLE_P (w, row))
return 1;
/* If the row the cursor is in is taller than the window's height,
it's not clear what to do, so do nothing. */
window_height = window_box_height (w);
if (row->height >= window_height)
{
if (!force_p || MINI_WINDOW_P (w)
|| w->vscroll || w->cursor.vpos == 0)
return 1;
}
return 0;
}
/* Try scrolling PT into view in window WINDOW. JUST_THIS_ONE_P
non-zero means only WINDOW is redisplayed in redisplay_internal.
TEMP_SCROLL_STEP has the same meaning as scroll_step, and is used
in redisplay_window to bring a partially visible line into view in
the case that only the cursor has moved.
LAST_LINE_MISFIT should be nonzero if we're scrolling because the
last screen line's vertical height extends past the end of the screen.
Value is
1 if scrolling succeeded
0 if scrolling didn't find point.
-1 if new fonts have been loaded so that we must interrupt
redisplay, adjust glyph matrices, and try again. */
enum
{
SCROLLING_SUCCESS,
SCROLLING_FAILED,
SCROLLING_NEED_LARGER_MATRICES
};
static int
try_scrolling (window, just_this_one_p, scroll_conservatively,
scroll_step, temp_scroll_step, last_line_misfit)
Lisp_Object window;
int just_this_one_p;
EMACS_INT scroll_conservatively, scroll_step;
int temp_scroll_step;
int last_line_misfit;
{
struct window *w = XWINDOW (window);
struct frame *f = XFRAME (w->frame);
struct text_pos pos, startp;
struct it it;
int this_scroll_margin, scroll_max, rc, height;
int dy = 0, amount_to_scroll = 0, scroll_down_p = 0;
int extra_scroll_margin_lines = last_line_misfit ? 1 : 0;
Lisp_Object aggressive;
int scroll_limit = INT_MAX / FRAME_LINE_HEIGHT (f);
#if GLYPH_DEBUG
debug_method_add (w, "try_scrolling");
#endif
SET_TEXT_POS_FROM_MARKER (startp, w->start);
/* Compute scroll margin height in pixels. We scroll when point is
within this distance from the top or bottom of the window. */
if (scroll_margin > 0)
this_scroll_margin = min (scroll_margin, WINDOW_TOTAL_LINES (w) / 4)
* FRAME_LINE_HEIGHT (f);
else
this_scroll_margin = 0;
/* Force scroll_conservatively to have a reasonable value, to avoid
overflow while computing how much to scroll. Note that the user
can supply scroll-conservatively equal to `most-positive-fixnum',
which can be larger than INT_MAX. */
if (scroll_conservatively > scroll_limit)
{
scroll_conservatively = scroll_limit;
scroll_max = INT_MAX;
}
else if (scroll_step || scroll_conservatively || temp_scroll_step)
/* Compute how much we should try to scroll maximally to bring
point into view. */
scroll_max = (max (scroll_step,
max (scroll_conservatively, temp_scroll_step))
* FRAME_LINE_HEIGHT (f));
else if (NUMBERP (current_buffer->scroll_down_aggressively)
|| NUMBERP (current_buffer->scroll_up_aggressively))
/* We're trying to scroll because of aggressive scrolling but no
scroll_step is set. Choose an arbitrary one. */
scroll_max = 10 * FRAME_LINE_HEIGHT (f);
else
scroll_max = 0;
too_near_end:
/* Decide whether to scroll down. */
if (PT > CHARPOS (startp))
{
int scroll_margin_y;
/* Compute the pixel ypos of the scroll margin, then move it to
either that ypos or PT, whichever comes first. */
start_display (&it, w, startp);
scroll_margin_y = it.last_visible_y - this_scroll_margin
- FRAME_LINE_HEIGHT (f) * extra_scroll_margin_lines;
move_it_to (&it, PT, -1, scroll_margin_y - 1, -1,
(MOVE_TO_POS | MOVE_TO_Y));
if (PT > CHARPOS (it.current.pos))
{
int y0 = line_bottom_y (&it);
/* Compute the distance from the scroll margin to PT
(including the height of the cursor line). Moving the
iterator unconditionally to PT can be slow if PT is far
away, so stop 10 lines past the window bottom (is there a
way to do the right thing quickly?). */
move_it_to (&it, PT, -1,
it.last_visible_y + 10 * FRAME_LINE_HEIGHT (f),
-1, MOVE_TO_POS | MOVE_TO_Y);
dy = line_bottom_y (&it) - y0;
if (dy > scroll_max)
return SCROLLING_FAILED;
scroll_down_p = 1;
}
}
if (scroll_down_p)
{
/* Point is in or below the bottom scroll margin, so move the
window start down. If scrolling conservatively, move it just
enough down to make point visible. If scroll_step is set,
move it down by scroll_step. */
if (scroll_conservatively)
amount_to_scroll
= min (max (dy, FRAME_LINE_HEIGHT (f)),
FRAME_LINE_HEIGHT (f) * scroll_conservatively);
else if (scroll_step || temp_scroll_step)
amount_to_scroll = scroll_max;
else
{
aggressive = current_buffer->scroll_up_aggressively;
height = WINDOW_BOX_TEXT_HEIGHT (w);
if (NUMBERP (aggressive))
{
double float_amount = XFLOATINT (aggressive) * height;
amount_to_scroll = float_amount;
if (amount_to_scroll == 0 && float_amount > 0)
amount_to_scroll = 1;
}
}
if (amount_to_scroll <= 0)
return SCROLLING_FAILED;
start_display (&it, w, startp);
move_it_vertically (&it, amount_to_scroll);
/* If STARTP is unchanged, move it down another screen line. */
if (CHARPOS (it.current.pos) == CHARPOS (startp))
move_it_by_lines (&it, 1, 1);
startp = it.current.pos;
}
else
{
struct text_pos scroll_margin_pos = startp;
/* See if point is inside the scroll margin at the top of the
window. */
if (this_scroll_margin)
{
start_display (&it, w, startp);
move_it_vertically (&it, this_scroll_margin);
scroll_margin_pos = it.current.pos;
}
if (PT < CHARPOS (scroll_margin_pos))
{
/* Point is in the scroll margin at the top of the window or
above what is displayed in the window. */
int y0;
/* Compute the vertical distance from PT to the scroll
margin position. Give up if distance is greater than
scroll_max. */
SET_TEXT_POS (pos, PT, PT_BYTE);
start_display (&it, w, pos);
y0 = it.current_y;
move_it_to (&it, CHARPOS (scroll_margin_pos), 0,
it.last_visible_y, -1,
MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y);
dy = it.current_y - y0;
if (dy > scroll_max)
return SCROLLING_FAILED;
/* Compute new window start. */
start_display (&it, w, startp);
if (scroll_conservatively)
amount_to_scroll
= max (dy, FRAME_LINE_HEIGHT (f) * max (scroll_step, temp_scroll_step));
else if (scroll_step || temp_scroll_step)
amount_to_scroll = scroll_max;
else
{
aggressive = current_buffer->scroll_down_aggressively;
height = WINDOW_BOX_TEXT_HEIGHT (w);
if (NUMBERP (aggressive))
{
double float_amount = XFLOATINT (aggressive) * height;
amount_to_scroll = float_amount;
if (amount_to_scroll == 0 && float_amount > 0)
amount_to_scroll = 1;
}
}
if (amount_to_scroll <= 0)
return SCROLLING_FAILED;
move_it_vertically_backward (&it, amount_to_scroll);
startp = it.current.pos;
}
}
/* Run window scroll functions. */
startp = run_window_scroll_functions (window, startp);
/* Display the window. Give up if new fonts are loaded, or if point
doesn't appear. */
if (!try_window (window, startp, 0))
rc = SCROLLING_NEED_LARGER_MATRICES;
else if (w->cursor.vpos < 0)
{
clear_glyph_matrix (w->desired_matrix);
rc = SCROLLING_FAILED;
}
else
{
/* Maybe forget recorded base line for line number display. */
if (!just_this_one_p
|| current_buffer->clip_changed
|| BEG_UNCHANGED < CHARPOS (startp))
w->base_line_number = Qnil;
/* If cursor ends up on a partially visible line,
treat that as being off the bottom of the screen. */
if (! cursor_row_fully_visible_p (w, extra_scroll_margin_lines <= 1, 0))
{
clear_glyph_matrix (w->desired_matrix);
++extra_scroll_margin_lines;
goto too_near_end;
}
rc = SCROLLING_SUCCESS;
}
return rc;
}
/* Compute a suitable window start for window W if display of W starts
on a continuation line. Value is non-zero if a new window start
was computed.
The new window start will be computed, based on W's width, starting
from the start of the continued line. It is the start of the
screen line with the minimum distance from the old start W->start. */
static int
compute_window_start_on_continuation_line (w)
struct window *w;
{
struct text_pos pos, start_pos;
int window_start_changed_p = 0;
SET_TEXT_POS_FROM_MARKER (start_pos, w->start);
/* If window start is on a continuation line... Window start may be
< BEGV in case there's invisible text at the start of the
buffer (M-x rmail, for example). */
if (CHARPOS (start_pos) > BEGV
&& FETCH_BYTE (BYTEPOS (start_pos) - 1) != '\n')
{
struct it it;
struct glyph_row *row;
/* Handle the case that the window start is out of range. */
if (CHARPOS (start_pos) < BEGV)
SET_TEXT_POS (start_pos, BEGV, BEGV_BYTE);
else if (CHARPOS (start_pos) > ZV)
SET_TEXT_POS (start_pos, ZV, ZV_BYTE);
/* Find the start of the continued line. This should be fast
because scan_buffer is fast (newline cache). */
row = w->desired_matrix->rows + (WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0);
init_iterator (&it, w, CHARPOS (start_pos), BYTEPOS (start_pos),
row, DEFAULT_FACE_ID);
reseat_at_previous_visible_line_start (&it);
/* If the line start is "too far" away from the window start,
say it takes too much time to compute a new window start. */
if (CHARPOS (start_pos) - IT_CHARPOS (it)
< WINDOW_TOTAL_LINES (w) * WINDOW_TOTAL_COLS (w))
{
int min_distance, distance;
/* Move forward by display lines to find the new window
start. If window width was enlarged, the new start can
be expected to be > the old start. If window width was
decreased, the new window start will be < the old start.
So, we're looking for the display line start with the
minimum distance from the old window start. */
pos = it.current.pos;
min_distance = INFINITY;
while ((distance = eabs (CHARPOS (start_pos) - IT_CHARPOS (it))),
distance < min_distance)
{
min_distance = distance;
pos = it.current.pos;
move_it_by_lines (&it, 1, 0);
}
/* Set the window start there. */
SET_MARKER_FROM_TEXT_POS (w->start, pos);
window_start_changed_p = 1;
}
}
return window_start_changed_p;
}
/* Try cursor movement in case text has not changed in window WINDOW,
with window start STARTP. Value is
CURSOR_MOVEMENT_SUCCESS if successful
CURSOR_MOVEMENT_CANNOT_BE_USED if this method cannot be used
CURSOR_MOVEMENT_MUST_SCROLL if we know we have to scroll the
display. *SCROLL_STEP is set to 1, under certain circumstances, if
we want to scroll as if scroll-step were set to 1. See the code.
CURSOR_MOVEMENT_NEED_LARGER_MATRICES if we need larger matrices, in
which case we have to abort this redisplay, and adjust matrices
first. */
enum
{
CURSOR_MOVEMENT_SUCCESS,
CURSOR_MOVEMENT_CANNOT_BE_USED,
CURSOR_MOVEMENT_MUST_SCROLL,
CURSOR_MOVEMENT_NEED_LARGER_MATRICES
};
static int
try_cursor_movement (window, startp, scroll_step)
Lisp_Object window;
struct text_pos startp;
int *scroll_step;
{
struct window *w = XWINDOW (window);
struct frame *f = XFRAME (w->frame);
int rc = CURSOR_MOVEMENT_CANNOT_BE_USED;
#if GLYPH_DEBUG
if (inhibit_try_cursor_movement)
return rc;
#endif
/* Handle case where text has not changed, only point, and it has
not moved off the frame. */
if (/* Point may be in this window. */
PT >= CHARPOS (startp)
/* Selective display hasn't changed. */
&& !current_buffer->clip_changed
/* Function force-mode-line-update is used to force a thorough
redisplay. It sets either windows_or_buffers_changed or
update_mode_lines. So don't take a shortcut here for these
cases. */
&& !update_mode_lines
&& !windows_or_buffers_changed
&& !cursor_type_changed
/* Can't use this case if highlighting a region. When a
region exists, cursor movement has to do more than just
set the cursor. */
&& !(!NILP (Vtransient_mark_mode)
&& !NILP (current_buffer->mark_active))
&& NILP (w->region_showing)
&& NILP (Vshow_trailing_whitespace)
/* Right after splitting windows, last_point may be nil. */
&& INTEGERP (w->last_point)
/* This code is not used for mini-buffer for the sake of the case
of redisplaying to replace an echo area message; since in
that case the mini-buffer contents per se are usually
unchanged. This code is of no real use in the mini-buffer
since the handling of this_line_start_pos, etc., in redisplay
handles the same cases. */
&& !EQ (window, minibuf_window)
/* When splitting windows or for new windows, it happens that
redisplay is called with a nil window_end_vpos or one being
larger than the window. This should really be fixed in
window.c. I don't have this on my list, now, so we do
approximately the same as the old redisplay code. --gerd. */
&& INTEGERP (w->window_end_vpos)
&& XFASTINT (w->window_end_vpos) < w->current_matrix->nrows
&& (FRAME_WINDOW_P (f)
|| !overlay_arrow_in_current_buffer_p ()))
{
int this_scroll_margin, top_scroll_margin;
struct glyph_row *row = NULL;
#if GLYPH_DEBUG
debug_method_add (w, "cursor movement");
#endif
/* Scroll if point within this distance from the top or bottom
of the window. This is a pixel value. */
if (scroll_margin > 0)
{
this_scroll_margin = min (scroll_margin, WINDOW_TOTAL_LINES (w) / 4);
this_scroll_margin *= FRAME_LINE_HEIGHT (f);
}
else
this_scroll_margin = 0;
top_scroll_margin = this_scroll_margin;
if (WINDOW_WANTS_HEADER_LINE_P (w))
top_scroll_margin += CURRENT_HEADER_LINE_HEIGHT (w);
/* Start with the row the cursor was displayed during the last
not paused redisplay. Give up if that row is not valid. */
if (w->last_cursor.vpos < 0
|| w->last_cursor.vpos >= w->current_matrix->nrows)
rc = CURSOR_MOVEMENT_MUST_SCROLL;
else
{
row = MATRIX_ROW (w->current_matrix, w->last_cursor.vpos);
if (row->mode_line_p)
++row;
if (!row->enabled_p)
rc = CURSOR_MOVEMENT_MUST_SCROLL;
}
if (rc == CURSOR_MOVEMENT_CANNOT_BE_USED)
{
int scroll_p = 0;
int last_y = window_text_bottom_y (w) - this_scroll_margin;
if (PT > XFASTINT (w->last_point))
{
/* Point has moved forward. */
while (MATRIX_ROW_END_CHARPOS (row) < PT
&& MATRIX_ROW_BOTTOM_Y (row) < last_y)
{
xassert (row->enabled_p);
++row;
}
/* The end position of a row equals the start position
of the next row. If PT is there, we would rather
display it in the next line. */
while (MATRIX_ROW_BOTTOM_Y (row) < last_y
&& MATRIX_ROW_END_CHARPOS (row) == PT
&& !cursor_row_p (w, row))
++row;
/* If within the scroll margin, scroll. Note that
MATRIX_ROW_BOTTOM_Y gives the pixel position at which
the next line would be drawn, and that
this_scroll_margin can be zero. */
if (MATRIX_ROW_BOTTOM_Y (row) > last_y
|| PT > MATRIX_ROW_END_CHARPOS (row)
/* Line is completely visible last line in window
and PT is to be set in the next line. */
|| (MATRIX_ROW_BOTTOM_Y (row) == last_y
&& PT == MATRIX_ROW_END_CHARPOS (row)
&& !row->ends_at_zv_p
&& !MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row)))
scroll_p = 1;
}
else if (PT < XFASTINT (w->last_point))
{
/* Cursor has to be moved backward. Note that PT >=
CHARPOS (startp) because of the outer if-statement. */
while (!row->mode_line_p
&& (MATRIX_ROW_START_CHARPOS (row) > PT
|| (MATRIX_ROW_START_CHARPOS (row) == PT
&& (MATRIX_ROW_STARTS_IN_MIDDLE_OF_CHAR_P (row)
|| (/* STARTS_IN_MIDDLE_OF_STRING_P (row) */
row > w->current_matrix->rows
&& (row-1)->ends_in_newline_from_string_p))))
&& (row->y > top_scroll_margin
|| CHARPOS (startp) == BEGV))
{
xassert (row->enabled_p);
--row;
}
/* Consider the following case: Window starts at BEGV,
there is invisible, intangible text at BEGV, so that
display starts at some point START > BEGV. It can
happen that we are called with PT somewhere between
BEGV and START. Try to handle that case. */
if (row < w->current_matrix->rows
|| row->mode_line_p)
{
row = w->current_matrix->rows;
if (row->mode_line_p)
++row;
}
/* Due to newlines in overlay strings, we may have to
skip forward over overlay strings. */
while (MATRIX_ROW_BOTTOM_Y (row) < last_y
&& MATRIX_ROW_END_CHARPOS (row) == PT
&& !cursor_row_p (w, row))
++row;
/* If within the scroll margin, scroll. */
if (row->y < top_scroll_margin
&& CHARPOS (startp) != BEGV)
scroll_p = 1;
}
else
{
/* Cursor did not move. So don't scroll even if cursor line
is partially visible, as it was so before. */
rc = CURSOR_MOVEMENT_SUCCESS;
}
if (PT < MATRIX_ROW_START_CHARPOS (row)
|| PT > MATRIX_ROW_END_CHARPOS (row))
{
/* if PT is not in the glyph row, give up. */
rc = CURSOR_MOVEMENT_MUST_SCROLL;
}
else if (rc != CURSOR_MOVEMENT_SUCCESS
&& MATRIX_ROW_PARTIALLY_VISIBLE_P (w, row)
&& make_cursor_line_fully_visible_p)
{
if (PT == MATRIX_ROW_END_CHARPOS (row)
&& !row->ends_at_zv_p
&& !MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row))
rc = CURSOR_MOVEMENT_MUST_SCROLL;
else if (row->height > window_box_height (w))
{
/* If we end up in a partially visible line, let's
make it fully visible, except when it's taller
than the window, in which case we can't do much
about it. */
*scroll_step = 1;
rc = CURSOR_MOVEMENT_MUST_SCROLL;
}
else
{
set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0);
if (!cursor_row_fully_visible_p (w, 0, 1))
rc = CURSOR_MOVEMENT_MUST_SCROLL;
else
rc = CURSOR_MOVEMENT_SUCCESS;
}
}
else if (scroll_p)
rc = CURSOR_MOVEMENT_MUST_SCROLL;
else
{
do
{
if (set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0))
{
rc = CURSOR_MOVEMENT_SUCCESS;
break;
}
++row;
}
while (MATRIX_ROW_BOTTOM_Y (row) < last_y
&& MATRIX_ROW_START_CHARPOS (row) == PT
&& cursor_row_p (w, row));
}
}
}
return rc;
}
void
set_vertical_scroll_bar (w)
struct window *w;
{
int start, end, whole;
/* Calculate the start and end positions for the current window.
At some point, it would be nice to choose between scrollbars
which reflect the whole buffer size, with special markers
indicating narrowing, and scrollbars which reflect only the
visible region.
Note that mini-buffers sometimes aren't displaying any text. */
if (!MINI_WINDOW_P (w)
|| (w == XWINDOW (minibuf_window)
&& NILP (echo_area_buffer[0])))
{
struct buffer *buf = XBUFFER (w->buffer);
whole = BUF_ZV (buf) - BUF_BEGV (buf);
start = marker_position (w->start) - BUF_BEGV (buf);
/* I don't think this is guaranteed to be right. For the
moment, we'll pretend it is. */
end = BUF_Z (buf) - XFASTINT (w->window_end_pos) - BUF_BEGV (buf);
if (end < start)
end = start;
if (whole < (end - start))
whole = end - start;
}
else
start = end = whole = 0;
/* Indicate what this scroll bar ought to be displaying now. */
if (FRAME_TERMINAL (XFRAME (w->frame))->set_vertical_scroll_bar_hook)
(*FRAME_TERMINAL (XFRAME (w->frame))->set_vertical_scroll_bar_hook)
(w, end - start, whole, start);
}
/* Redisplay leaf window WINDOW. JUST_THIS_ONE_P non-zero means only
selected_window is redisplayed.
We can return without actually redisplaying the window if
fonts_changed_p is nonzero. In that case, redisplay_internal will
retry. */
static void
redisplay_window (window, just_this_one_p)
Lisp_Object window;
int just_this_one_p;
{
struct window *w = XWINDOW (window);
struct frame *f = XFRAME (w->frame);
struct buffer *buffer = XBUFFER (w->buffer);
struct buffer *old = current_buffer;
struct text_pos lpoint, opoint, startp;
int update_mode_line;
int tem;
struct it it;
/* Record it now because it's overwritten. */
int current_matrix_up_to_date_p = 0;
int used_current_matrix_p = 0;
/* This is less strict than current_matrix_up_to_date_p.
It indictes that the buffer contents and narrowing are unchanged. */
int buffer_unchanged_p = 0;
int temp_scroll_step = 0;
int count = SPECPDL_INDEX ();
int rc;
int centering_position = -1;
int last_line_misfit = 0;
int beg_unchanged, end_unchanged;
SET_TEXT_POS (lpoint, PT, PT_BYTE);
opoint = lpoint;
/* W must be a leaf window here. */
xassert (!NILP (w->buffer));
#if GLYPH_DEBUG
*w->desired_matrix->method = 0;
#endif
restart:
reconsider_clip_changes (w, buffer);
/* Has the mode line to be updated? */
update_mode_line = (!NILP (w->update_mode_line)
|| update_mode_lines
|| buffer->clip_changed
|| buffer->prevent_redisplay_optimizations_p);
if (MINI_WINDOW_P (w))
{
if (w == XWINDOW (echo_area_window)
&& !NILP (echo_area_buffer[0]))
{
if (update_mode_line)
/* We may have to update a tty frame's menu bar or a
tool-bar. Example `M-x C-h C-h C-g'. */
goto finish_menu_bars;
else
/* We've already displayed the echo area glyphs in this window. */
goto finish_scroll_bars;
}
else if ((w != XWINDOW (minibuf_window)
|| minibuf_level == 0)
/* When buffer is nonempty, redisplay window normally. */
&& BUF_Z (XBUFFER (w->buffer)) == BUF_BEG (XBUFFER (w->buffer))
/* Quail displays non-mini buffers in minibuffer window.
In that case, redisplay the window normally. */
&& !NILP (Fmemq (w->buffer, Vminibuffer_list)))
{
/* W is a mini-buffer window, but it's not active, so clear
it. */
int yb = window_text_bottom_y (w);
struct glyph_row *row;
int y;
for (y = 0, row = w->desired_matrix->rows;
y < yb;
y += row->height, ++row)
blank_row (w, row, y);
goto finish_scroll_bars;
}
clear_glyph_matrix (w->desired_matrix);
}
/* Otherwise set up data on this window; select its buffer and point
value. */
/* Really select the buffer, for the sake of buffer-local
variables. */
set_buffer_internal_1 (XBUFFER (w->buffer));
current_matrix_up_to_date_p
= (!NILP (w->window_end_valid)
&& !current_buffer->clip_changed
&& !current_buffer->prevent_redisplay_optimizations_p
&& XFASTINT (w->last_modified) >= MODIFF
&& XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF);
/* Run the window-bottom-change-functions
if it is possible that the text on the screen has changed
(either due to modification of the text, or any other reason). */
if (!current_matrix_up_to_date_p
&& !NILP (Vwindow_text_change_functions))
{
safe_run_hooks (Qwindow_text_change_functions);
goto restart;
}
beg_unchanged = BEG_UNCHANGED;
end_unchanged = END_UNCHANGED;
SET_TEXT_POS (opoint, PT, PT_BYTE);
specbind (Qinhibit_point_motion_hooks, Qt);
buffer_unchanged_p
= (!NILP (w->window_end_valid)
&& !current_buffer->clip_changed
&& XFASTINT (w->last_modified) >= MODIFF
&& XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF);
/* When windows_or_buffers_changed is non-zero, we can't rely on
the window end being valid, so set it to nil there. */
if (windows_or_buffers_changed)
{
/* If window starts on a continuation line, maybe adjust the
window start in case the window's width changed. */
if (XMARKER (w->start)->buffer == current_buffer)
compute_window_start_on_continuation_line (w);
w->window_end_valid = Qnil;
}
/* Some sanity checks. */
CHECK_WINDOW_END (w);
if (Z == Z_BYTE && CHARPOS (opoint) != BYTEPOS (opoint))
abort ();
if (BYTEPOS (opoint) < CHARPOS (opoint))
abort ();
/* If %c is in mode line, update it if needed. */
if (!NILP (w->column_number_displayed)
/* This alternative quickly identifies a common case
where no change is needed. */
&& !(PT == XFASTINT (w->last_point)
&& XFASTINT (w->last_modified) >= MODIFF
&& XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)
&& (XFASTINT (w->column_number_displayed)
!= (int) current_column ())) /* iftc */
update_mode_line = 1;
/* Count number of windows showing the selected buffer. An indirect
buffer counts as its base buffer. */
if (!just_this_one_p)
{
struct buffer *current_base, *window_base;
current_base = current_buffer;
window_base = XBUFFER (XWINDOW (selected_window)->buffer);
if (current_base->base_buffer)
current_base = current_base->base_buffer;
if (window_base->base_buffer)
window_base = window_base->base_buffer;
if (current_base == window_base)
buffer_shared++;
}
/* Point refers normally to the selected window. For any other
window, set up appropriate value. */
if (!EQ (window, selected_window))
{
int new_pt = XMARKER (w->pointm)->charpos;
int new_pt_byte = marker_byte_position (w->pointm);
if (new_pt < BEGV)
{
new_pt = BEGV;
new_pt_byte = BEGV_BYTE;
set_marker_both (w->pointm, Qnil, BEGV, BEGV_BYTE);
}
else if (new_pt > (ZV - 1))
{
new_pt = ZV;
new_pt_byte = ZV_BYTE;
set_marker_both (w->pointm, Qnil, ZV, ZV_BYTE);
}
/* We don't use SET_PT so that the point-motion hooks don't run. */
TEMP_SET_PT_BOTH (new_pt, new_pt_byte);
}
/* If any of the character widths specified in the display table
have changed, invalidate the width run cache. It's true that
this may be a bit late to catch such changes, but the rest of
redisplay goes (non-fatally) haywire when the display table is
changed, so why should we worry about doing any better? */
if (current_buffer->width_run_cache)
{
struct Lisp_Char_Table *disptab = buffer_display_table ();
if (! disptab_matches_widthtab (disptab,
XVECTOR (current_buffer->width_table)))
{
invalidate_region_cache (current_buffer,
current_buffer->width_run_cache,
BEG, Z);
recompute_width_table (current_buffer, disptab);
}
}
/* If window-start is screwed up, choose a new one. */
if (XMARKER (w->start)->buffer != current_buffer)
goto recenter;
SET_TEXT_POS_FROM_MARKER (startp, w->start);
/* If someone specified a new starting point but did not insist,
check whether it can be used. */
if (!NILP (w->optional_new_start)
&& CHARPOS (startp) >= BEGV
&& CHARPOS (startp) <= ZV)
{
w->optional_new_start = Qnil;
start_display (&it, w, startp);
move_it_to (&it, PT, 0, it.last_visible_y, -1,
MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y);
if (IT_CHARPOS (it) == PT)
w->force_start = Qt;
/* IT may overshoot PT if text at PT is invisible. */
else if (IT_CHARPOS (it) > PT && CHARPOS (startp) <= PT)
w->force_start = Qt;
}
force_start:
/* Handle case where place to start displaying has been specified,
unless the specified location is outside the accessible range. */
if (!NILP (w->force_start)
|| w->frozen_window_start_p)
{
/* We set this later on if we have to adjust point. */
int new_vpos = -1;
w->force_start = Qnil;
w->vscroll = 0;
w->window_end_valid = Qnil;
/* Forget any recorded base line for line number display. */
if (!buffer_unchanged_p)
w->base_line_number = Qnil;
/* Redisplay the mode line. Select the buffer properly for that.
Also, run the hook window-scroll-functions
because we have scrolled. */
/* Note, we do this after clearing force_start because
if there's an error, it is better to forget about force_start
than to get into an infinite loop calling the hook functions
and having them get more errors. */
if (!update_mode_line
|| ! NILP (Vwindow_scroll_functions))
{
update_mode_line = 1;
w->update_mode_line = Qt;
startp = run_window_scroll_functions (window, startp);
}
w->last_modified = make_number (0);
w->last_overlay_modified = make_number (0);
if (CHARPOS (startp) < BEGV)
SET_TEXT_POS (startp, BEGV, BEGV_BYTE);
else if (CHARPOS (startp) > ZV)
SET_TEXT_POS (startp, ZV, ZV_BYTE);
/* Redisplay, then check if cursor has been set during the
redisplay. Give up if new fonts were loaded. */
/* We used to issue a CHECK_MARGINS argument to try_window here,
but this causes scrolling to fail when point begins inside
the scroll margin (bug#148) -- cyd */
if (!try_window (window, startp, 0))
{
w->force_start = Qt;
clear_glyph_matrix (w->desired_matrix);
goto need_larger_matrices;
}
if (w->cursor.vpos < 0 && !w->frozen_window_start_p)
{
/* If point does not appear, try to move point so it does
appear. The desired matrix has been built above, so we
can use it here. */
new_vpos = window_box_height (w) / 2;
}
if (!cursor_row_fully_visible_p (w, 0, 0))
{
/* Point does appear, but on a line partly visible at end of window.
Move it back to a fully-visible line. */
new_vpos = window_box_height (w);
}
/* If we need to move point for either of the above reasons,
now actually do it. */
if (new_vpos >= 0)
{
struct glyph_row *row;
row = MATRIX_FIRST_TEXT_ROW (w->desired_matrix);
while (MATRIX_ROW_BOTTOM_Y (row) < new_vpos)
++row;
TEMP_SET_PT_BOTH (MATRIX_ROW_START_CHARPOS (row),
MATRIX_ROW_START_BYTEPOS (row));
if (w != XWINDOW (selected_window))
set_marker_both (w->pointm, Qnil, PT, PT_BYTE);
else if (current_buffer == old)
SET_TEXT_POS (lpoint, PT, PT_BYTE);
set_cursor_from_row (w, row, w->desired_matrix, 0, 0, 0, 0);
/* If we are highlighting the region, then we just changed
the region, so redisplay to show it. */
if (!NILP (Vtransient_mark_mode)
&& !NILP (current_buffer->mark_active))
{
clear_glyph_matrix (w->desired_matrix);
if (!try_window (window, startp, 0))
goto need_larger_matrices;
}
}
#if GLYPH_DEBUG
debug_method_add (w, "forced window start");
#endif
goto done;
}
/* Handle case where text has not changed, only point, and it has
not moved off the frame, and we are not retrying after hscroll.
(current_matrix_up_to_date_p is nonzero when retrying.) */
if (current_matrix_up_to_date_p
&& (rc = try_cursor_movement (window, startp, &temp_scroll_step),
rc != CURSOR_MOVEMENT_CANNOT_BE_USED))
{
switch (rc)
{
case CURSOR_MOVEMENT_SUCCESS:
used_current_matrix_p = 1;
goto done;
case CURSOR_MOVEMENT_MUST_SCROLL:
goto try_to_scroll;
default:
abort ();
}
}
/* If current starting point was originally the beginning of a line
but no longer is, find a new starting point. */
else if (!NILP (w->start_at_line_beg)
&& !(CHARPOS (startp) <= BEGV
|| FETCH_BYTE (BYTEPOS (startp) - 1) == '\n'))
{
#if GLYPH_DEBUG
debug_method_add (w, "recenter 1");
#endif
goto recenter;
}
/* Try scrolling with try_window_id. Value is > 0 if update has
been done, it is -1 if we know that the same window start will
not work. It is 0 if unsuccessful for some other reason. */
else if ((tem = try_window_id (w)) != 0)
{
#if GLYPH_DEBUG
debug_method_add (w, "try_window_id %d", tem);
#endif
if (fonts_changed_p)
goto need_larger_matrices;
if (tem > 0)
goto done;
/* Otherwise try_window_id has returned -1 which means that we
don't want the alternative below this comment to execute. */
}
else if (CHARPOS (startp) >= BEGV
&& CHARPOS (startp) <= ZV
&& PT >= CHARPOS (startp)
&& (CHARPOS (startp) < ZV
/* Avoid starting at end of buffer. */
|| CHARPOS (startp) == BEGV
|| (XFASTINT (w->last_modified) >= MODIFF
&& XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)))
{
/* If first window line is a continuation line, and window start
is inside the modified region, but the first change is before
current window start, we must select a new window start.
However, if this is the result of a down-mouse event (e.g. by
extending the mouse-drag-overlay), we don't want to select a
new window start, since that would change the position under
the mouse, resulting in an unwanted mouse-movement rather
than a simple mouse-click. */
if (NILP (w->start_at_line_beg)
&& NILP (do_mouse_tracking)
&& CHARPOS (startp) > BEGV
&& CHARPOS (startp) > BEG + beg_unchanged
&& CHARPOS (startp) <= Z - end_unchanged
/* Even if w->start_at_line_beg is nil, a new window may
start at a line_beg, since that's how set_buffer_window
sets it. So, we need to check the return value of
compute_window_start_on_continuation_line. (See also
bug#197). */
&& XMARKER (w->start)->buffer == current_buffer
&& compute_window_start_on_continuation_line (w))
{
w->force_start = Qt;
SET_TEXT_POS_FROM_MARKER (startp, w->start);
goto force_start;
}
#if GLYPH_DEBUG
debug_method_add (w, "same window start");
#endif
/* Try to redisplay starting at same place as before.
If point has not moved off frame, accept the results. */
if (!current_matrix_up_to_date_p
/* Don't use try_window_reusing_current_matrix in this case
because a window scroll function can have changed the
buffer. */
|| !NILP (Vwindow_scroll_functions)
|| MINI_WINDOW_P (w)
|| !(used_current_matrix_p
= try_window_reusing_current_matrix (w)))
{
IF_DEBUG (debug_method_add (w, "1"));
if (try_window (window, startp, 1) < 0)
/* -1 means we need to scroll.
0 means we need new matrices, but fonts_changed_p
is set in that case, so we will detect it below. */
goto try_to_scroll;
}
if (fonts_changed_p)
goto need_larger_matrices;
if (w->cursor.vpos >= 0)
{
if (!just_this_one_p
|| current_buffer->clip_changed
|| BEG_UNCHANGED < CHARPOS (startp))
/* Forget any recorded base line for line number display. */
w->base_line_number = Qnil;
if (!cursor_row_fully_visible_p (w, 1, 0))
{
clear_glyph_matrix (w->desired_matrix);
last_line_misfit = 1;
}
/* Drop through and scroll. */
else
goto done;
}
else
clear_glyph_matrix (w->desired_matrix);
}
try_to_scroll:
w->last_modified = make_number (0);
w->last_overlay_modified = make_number (0);
/* Redisplay the mode line. Select the buffer properly for that. */
if (!update_mode_line)
{
update_mode_line = 1;
w->update_mode_line = Qt;
}
/* Try to scroll by specified few lines. */
if ((scroll_conservatively
|| scroll_step
|| temp_scroll_step
|| NUMBERP (current_buffer->scroll_up_aggressively)
|| NUMBERP (current_buffer->scroll_down_aggressively))
&& !current_buffer->clip_changed
&& CHARPOS (startp) >= BEGV
&& CHARPOS (startp) <= ZV)
{
/* The function returns -1 if new fonts were loaded, 1 if
successful, 0 if not successful. */
int rc = try_scrolling (window, just_this_one_p,
scroll_conservatively,
scroll_step,
temp_scroll_step, last_line_misfit);
switch (rc)
{
case SCROLLING_SUCCESS:
goto done;
case SCROLLING_NEED_LARGER_MATRICES:
goto need_larger_matrices;
case SCROLLING_FAILED:
break;
default:
abort ();
}
}
/* Finally, just choose place to start which centers point */
recenter:
if (centering_position < 0)
centering_position = window_box_height (w) / 2;
#if GLYPH_DEBUG
debug_method_add (w, "recenter");
#endif
/* w->vscroll = 0; */
/* Forget any previously recorded base line for line number display. */
if (!buffer_unchanged_p)
w->base_line_number = Qnil;
/* Move backward half the height of the window. */
init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID);
it.current_y = it.last_visible_y;
move_it_vertically_backward (&it, centering_position);
xassert (IT_CHARPOS (it) >= BEGV);
/* The function move_it_vertically_backward may move over more
than the specified y-distance. If it->w is small, e.g. a
mini-buffer window, we may end up in front of the window's
display area. Start displaying at the start of the line
containing PT in this case. */
if (it.current_y <= 0)
{
init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID);
move_it_vertically_backward (&it, 0);
it.current_y = 0;
}
it.current_x = it.hpos = 0;
/* Set startp here explicitly in case that helps avoid an infinite loop
in case the window-scroll-functions functions get errors. */
set_marker_both (w->start, Qnil, IT_CHARPOS (it), IT_BYTEPOS (it));
/* Run scroll hooks. */
startp = run_window_scroll_functions (window, it.current.pos);
/* Redisplay the window. */
if (!current_matrix_up_to_date_p
|| windows_or_buffers_changed
|| cursor_type_changed
/* Don't use try_window_reusing_current_matrix in this case
because it can have changed the buffer. */
|| !NILP (Vwindow_scroll_functions)
|| !just_this_one_p
|| MINI_WINDOW_P (w)
|| !(used_current_matrix_p
= try_window_reusing_current_matrix (w)))
try_window (window, startp, 0);
/* If new fonts have been loaded (due to fontsets), give up. We
have to start a new redisplay since we need to re-adjust glyph
matrices. */
if (fonts_changed_p)
goto need_larger_matrices;
/* If cursor did not appear assume that the middle of the window is
in the first line of the window. Do it again with the next line.
(Imagine a window of height 100, displaying two lines of height
60. Moving back 50 from it->last_visible_y will end in the first
line.) */
if (w->cursor.vpos < 0)
{
if (!NILP (w->window_end_valid)
&& PT >= Z - XFASTINT (w->window_end_pos))
{
clear_glyph_matrix (w->desired_matrix);
move_it_by_lines (&it, 1, 0);
try_window (window, it.current.pos, 0);
}
else if (PT < IT_CHARPOS (it))
{
clear_glyph_matrix (w->desired_matrix);
move_it_by_lines (&it, -1, 0);
try_window (window, it.current.pos, 0);
}
else
{
/* Not much we can do about it. */
}
}
/* Consider the following case: Window starts at BEGV, there is
invisible, intangible text at BEGV, so that display starts at
some point START > BEGV. It can happen that we are called with
PT somewhere between BEGV and START. Try to handle that case. */
if (w->cursor.vpos < 0)
{
struct glyph_row *row = w->current_matrix->rows;
if (row->mode_line_p)
++row;
set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0);
}
if (!cursor_row_fully_visible_p (w, 0, 0))
{
/* If vscroll is enabled, disable it and try again. */
if (w->vscroll)
{
w->vscroll = 0;
clear_glyph_matrix (w->desired_matrix);
goto recenter;
}
/* If centering point failed to make the whole line visible,
put point at the top instead. That has to make the whole line
visible, if it can be done. */
if (centering_position == 0)
goto done;
clear_glyph_matrix (w->desired_matrix);
centering_position = 0;
goto recenter;
}
done:
SET_TEXT_POS_FROM_MARKER (startp, w->start);
w->start_at_line_beg = ((CHARPOS (startp) == BEGV
|| FETCH_BYTE (BYTEPOS (startp) - 1) == '\n')
? Qt : Qnil);
/* Display the mode line, if we must. */
if ((update_mode_line
/* If window not full width, must redo its mode line
if (a) the window to its side is being redone and
(b) we do a frame-based redisplay. This is a consequence
of how inverted lines are drawn in frame-based redisplay. */
|| (!just_this_one_p
&& !FRAME_WINDOW_P (f)
&& !WINDOW_FULL_WIDTH_P (w))
/* Line number to display. */
|| INTEGERP (w->base_line_pos)
/* Column number is displayed and different from the one displayed. */
|| (!NILP (w->column_number_displayed)
&& (XFASTINT (w->column_number_displayed)
!= (int) current_column ()))) /* iftc */
/* This means that the window has a mode line. */
&& (WINDOW_WANTS_MODELINE_P (w)
|| WINDOW_WANTS_HEADER_LINE_P (w)))
{
display_mode_lines (w);
/* If mode line height has changed, arrange for a thorough
immediate redisplay using the correct mode line height. */
if (WINDOW_WANTS_MODELINE_P (w)
&& CURRENT_MODE_LINE_HEIGHT (w) != DESIRED_MODE_LINE_HEIGHT (w))
{
fonts_changed_p = 1;
MATRIX_MODE_LINE_ROW (w->current_matrix)->height
= DESIRED_MODE_LINE_HEIGHT (w);
}
/* If header line height has changed, arrange for a thorough
immediate redisplay using the correct header line height. */
if (WINDOW_WANTS_HEADER_LINE_P (w)
&& CURRENT_HEADER_LINE_HEIGHT (w) != DESIRED_HEADER_LINE_HEIGHT (w))
{
fonts_changed_p = 1;
MATRIX_HEADER_LINE_ROW (w->current_matrix)->height
= DESIRED_HEADER_LINE_HEIGHT (w);
}
if (fonts_changed_p)
goto need_larger_matrices;
}
if (!line_number_displayed
&& !BUFFERP (w->base_line_pos))
{
w->base_line_pos = Qnil;
w->base_line_number = Qnil;
}
finish_menu_bars:
/* When we reach a frame's selected window, redo the frame's menu bar. */
if (update_mode_line
&& EQ (FRAME_SELECTED_WINDOW (f), window))
{
int redisplay_menu_p = 0;
int redisplay_tool_bar_p = 0;
if (FRAME_WINDOW_P (f))
{
#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) \
|| defined (HAVE_NS) || defined (USE_GTK)
redisplay_menu_p = FRAME_EXTERNAL_MENU_BAR (f);
#else
redisplay_menu_p = FRAME_MENU_BAR_LINES (f) > 0;
#endif
}
else
redisplay_menu_p = FRAME_MENU_BAR_LINES (f) > 0;
if (redisplay_menu_p)
display_menu_bar (w);
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (f))
{
#if defined (USE_GTK) || defined (HAVE_NS)
redisplay_tool_bar_p = FRAME_EXTERNAL_TOOL_BAR (f);
#else
redisplay_tool_bar_p = WINDOWP (f->tool_bar_window)
&& (FRAME_TOOL_BAR_LINES (f) > 0
|| !NILP (Vauto_resize_tool_bars));
#endif
if (redisplay_tool_bar_p && redisplay_tool_bar (f))
{
extern int ignore_mouse_drag_p;
ignore_mouse_drag_p = 1;
}
}
#endif
}
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (f)
&& update_window_fringes (w, (just_this_one_p
|| (!used_current_matrix_p && !overlay_arrow_seen)
|| w->pseudo_window_p)))
{
update_begin (f);
BLOCK_INPUT;
if (draw_window_fringes (w, 1))
x_draw_vertical_border (w);
UNBLOCK_INPUT;
update_end (f);
}
#endif /* HAVE_WINDOW_SYSTEM */
/* We go to this label, with fonts_changed_p nonzero,
if it is necessary to try again using larger glyph matrices.
We have to redeem the scroll bar even in this case,
because the loop in redisplay_internal expects that. */
need_larger_matrices:
;
finish_scroll_bars:
if (WINDOW_HAS_VERTICAL_SCROLL_BAR (w))
{
/* Set the thumb's position and size. */
set_vertical_scroll_bar (w);
/* Note that we actually used the scroll bar attached to this
window, so it shouldn't be deleted at the end of redisplay. */
if (FRAME_TERMINAL (f)->redeem_scroll_bar_hook)
(*FRAME_TERMINAL (f)->redeem_scroll_bar_hook) (w);
}
/* Restore current_buffer and value of point in it. */
TEMP_SET_PT_BOTH (CHARPOS (opoint), BYTEPOS (opoint));
set_buffer_internal_1 (old);
/* Avoid an abort in TEMP_SET_PT_BOTH if the buffer has become
shorter. This can be caused by log truncation in *Messages*. */
if (CHARPOS (lpoint) <= ZV)
TEMP_SET_PT_BOTH (CHARPOS (lpoint), BYTEPOS (lpoint));
unbind_to (count, Qnil);
}
/* Build the complete desired matrix of WINDOW with a window start
buffer position POS.
Value is 1 if successful. It is zero if fonts were loaded during
redisplay which makes re-adjusting glyph matrices necessary, and -1
if point would appear in the scroll margins.
(We check that only if CHECK_MARGINS is nonzero. */
int
try_window (window, pos, check_margins)
Lisp_Object window;
struct text_pos pos;
int check_margins;
{
struct window *w = XWINDOW (window);
struct it it;
struct glyph_row *last_text_row = NULL;
struct frame *f = XFRAME (w->frame);
/* Make POS the new window start. */
set_marker_both (w->start, Qnil, CHARPOS (pos), BYTEPOS (pos));
/* Mark cursor position as unknown. No overlay arrow seen. */
w->cursor.vpos = -1;
overlay_arrow_seen = 0;
/* Initialize iterator and info to start at POS. */
start_display (&it, w, pos);
/* Display all lines of W. */
while (it.current_y < it.last_visible_y)
{
if (display_line (&it))
last_text_row = it.glyph_row - 1;
if (fonts_changed_p)
return 0;
}
/* Don't let the cursor end in the scroll margins. */
if (check_margins
&& !MINI_WINDOW_P (w))
{
int this_scroll_margin;
if (scroll_margin > 0)
{
this_scroll_margin = min (scroll_margin, WINDOW_TOTAL_LINES (w) / 4);
this_scroll_margin *= FRAME_LINE_HEIGHT (f);
}
else
this_scroll_margin = 0;
if ((w->cursor.y >= 0 /* not vscrolled */
&& w->cursor.y < this_scroll_margin
&& CHARPOS (pos) > BEGV
&& IT_CHARPOS (it) < ZV)
/* rms: considering make_cursor_line_fully_visible_p here
seems to give wrong results. We don't want to recenter
when the last line is partly visible, we want to allow
that case to be handled in the usual way. */
|| w->cursor.y > it.last_visible_y - this_scroll_margin - 1)
{
w->cursor.vpos = -1;
clear_glyph_matrix (w->desired_matrix);
return -1;
}
}
/* If bottom moved off end of frame, change mode line percentage. */
if (XFASTINT (w->window_end_pos) <= 0
&& Z != IT_CHARPOS (it))
w->update_mode_line = Qt;
/* Set window_end_pos to the offset of the last character displayed
on the window from the end of current_buffer. Set
window_end_vpos to its row number. */
if (last_text_row)
{
xassert (MATRIX_ROW_DISPLAYS_TEXT_P (last_text_row));
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row);
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (last_text_row));
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (last_text_row, w->desired_matrix));
xassert (MATRIX_ROW (w->desired_matrix, XFASTINT (w->window_end_vpos))
->displays_text_p);
}
else
{
w->window_end_bytepos = Z_BYTE - ZV_BYTE;
w->window_end_pos = make_number (Z - ZV);
w->window_end_vpos = make_number (0);
}
/* But that is not valid info until redisplay finishes. */
w->window_end_valid = Qnil;
return 1;
}
/************************************************************************
Window redisplay reusing current matrix when buffer has not changed
************************************************************************/
/* Try redisplay of window W showing an unchanged buffer with a
different window start than the last time it was displayed by
reusing its current matrix. Value is non-zero if successful.
W->start is the new window start. */
static int
try_window_reusing_current_matrix (w)
struct window *w;
{
struct frame *f = XFRAME (w->frame);
struct glyph_row *row, *bottom_row;
struct it it;
struct run run;
struct text_pos start, new_start;
int nrows_scrolled, i;
struct glyph_row *last_text_row;
struct glyph_row *last_reused_text_row;
struct glyph_row *start_row;
int start_vpos, min_y, max_y;
#if GLYPH_DEBUG
if (inhibit_try_window_reusing)
return 0;
#endif
if (/* This function doesn't handle terminal frames. */
!FRAME_WINDOW_P (f)
/* Don't try to reuse the display if windows have been split
or such. */
|| windows_or_buffers_changed
|| cursor_type_changed)
return 0;
/* Can't do this if region may have changed. */
if ((!NILP (Vtransient_mark_mode)
&& !NILP (current_buffer->mark_active))
|| !NILP (w->region_showing)
|| !NILP (Vshow_trailing_whitespace))
return 0;
/* If top-line visibility has changed, give up. */
if (WINDOW_WANTS_HEADER_LINE_P (w)
!= MATRIX_HEADER_LINE_ROW (w->current_matrix)->mode_line_p)
return 0;
/* Give up if old or new display is scrolled vertically. We could
make this function handle this, but right now it doesn't. */
start_row = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
if (w->vscroll || MATRIX_ROW_PARTIALLY_VISIBLE_P (w, start_row))
return 0;
/* The variable new_start now holds the new window start. The old
start `start' can be determined from the current matrix. */
SET_TEXT_POS_FROM_MARKER (new_start, w->start);
start = start_row->start.pos;
start_vpos = MATRIX_ROW_VPOS (start_row, w->current_matrix);
/* Clear the desired matrix for the display below. */
clear_glyph_matrix (w->desired_matrix);
if (CHARPOS (new_start) <= CHARPOS (start))
{
int first_row_y;
/* Don't use this method if the display starts with an ellipsis
displayed for invisible text. It's not easy to handle that case
below, and it's certainly not worth the effort since this is
not a frequent case. */
if (in_ellipses_for_invisible_text_p (&start_row->start, w))
return 0;
IF_DEBUG (debug_method_add (w, "twu1"));
/* Display up to a row that can be reused. The variable
last_text_row is set to the last row displayed that displays
text. Note that it.vpos == 0 if or if not there is a
header-line; it's not the same as the MATRIX_ROW_VPOS! */
start_display (&it, w, new_start);
first_row_y = it.current_y;
w->cursor.vpos = -1;
last_text_row = last_reused_text_row = NULL;
while (it.current_y < it.last_visible_y
&& !fonts_changed_p)
{
/* If we have reached into the characters in the START row,
that means the line boundaries have changed. So we
can't start copying with the row START. Maybe it will
work to start copying with the following row. */
while (IT_CHARPOS (it) > CHARPOS (start))
{
/* Advance to the next row as the "start". */
start_row++;
start = start_row->start.pos;
/* If there are no more rows to try, or just one, give up. */
if (start_row == MATRIX_MODE_LINE_ROW (w->current_matrix) - 1
|| w->vscroll || MATRIX_ROW_PARTIALLY_VISIBLE_P (w, start_row)
|| CHARPOS (start) == ZV)
{
clear_glyph_matrix (w->desired_matrix);
return 0;
}
start_vpos = MATRIX_ROW_VPOS (start_row, w->current_matrix);
}
/* If we have reached alignment,
we can copy the rest of the rows. */
if (IT_CHARPOS (it) == CHARPOS (start))
break;
if (display_line (&it))
last_text_row = it.glyph_row - 1;
}
/* A value of current_y < last_visible_y means that we stopped
at the previous window start, which in turn means that we
have at least one reusable row. */
if (it.current_y < it.last_visible_y)
{
/* IT.vpos always starts from 0; it counts text lines. */
nrows_scrolled = it.vpos - (start_row - MATRIX_FIRST_TEXT_ROW (w->current_matrix));
/* Find PT if not already found in the lines displayed. */
if (w->cursor.vpos < 0)
{
int dy = it.current_y - start_row->y;
row = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
row = row_containing_pos (w, PT, row, NULL, dy);
if (row)
set_cursor_from_row (w, row, w->current_matrix, 0, 0,
dy, nrows_scrolled);
else
{
clear_glyph_matrix (w->desired_matrix);
return 0;
}
}
/* Scroll the display. Do it before the current matrix is
changed. The problem here is that update has not yet
run, i.e. part of the current matrix is not up to date.
scroll_run_hook will clear the cursor, and use the
current matrix to get the height of the row the cursor is
in. */
run.current_y = start_row->y;
run.desired_y = it.current_y;
run.height = it.last_visible_y - it.current_y;
if (run.height > 0 && run.current_y != run.desired_y)
{
update_begin (f);
FRAME_RIF (f)->update_window_begin_hook (w);
FRAME_RIF (f)->clear_window_mouse_face (w);
FRAME_RIF (f)->scroll_run_hook (w, &run);
FRAME_RIF (f)->update_window_end_hook (w, 0, 0);
update_end (f);
}
/* Shift current matrix down by nrows_scrolled lines. */
bottom_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w);
rotate_matrix (w->current_matrix,
start_vpos,
MATRIX_ROW_VPOS (bottom_row, w->current_matrix),
nrows_scrolled);
/* Disable lines that must be updated. */
for (i = 0; i < nrows_scrolled; ++i)
(start_row + i)->enabled_p = 0;
/* Re-compute Y positions. */
min_y = WINDOW_HEADER_LINE_HEIGHT (w);
max_y = it.last_visible_y;
for (row = start_row + nrows_scrolled;
row < bottom_row;
++row)
{
row->y = it.current_y;
row->visible_height = row->height;
if (row->y < min_y)
row->visible_height -= min_y - row->y;
if (row->y + row->height > max_y)
row->visible_height -= row->y + row->height - max_y;
row->redraw_fringe_bitmaps_p = 1;
it.current_y += row->height;
if (MATRIX_ROW_DISPLAYS_TEXT_P (row))
last_reused_text_row = row;
if (MATRIX_ROW_BOTTOM_Y (row) >= it.last_visible_y)
break;
}
/* Disable lines in the current matrix which are now
below the window. */
for (++row; row < bottom_row; ++row)
row->enabled_p = row->mode_line_p = 0;
}
/* Update window_end_pos etc.; last_reused_text_row is the last
reused row from the current matrix containing text, if any.
The value of last_text_row is the last displayed line
containing text. */
if (last_reused_text_row)
{
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_reused_text_row);
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (last_reused_text_row));
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (last_reused_text_row,
w->current_matrix));
}
else if (last_text_row)
{
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row);
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (last_text_row));
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (last_text_row, w->desired_matrix));
}
else
{
/* This window must be completely empty. */
w->window_end_bytepos = Z_BYTE - ZV_BYTE;
w->window_end_pos = make_number (Z - ZV);
w->window_end_vpos = make_number (0);
}
w->window_end_valid = Qnil;
/* Update hint: don't try scrolling again in update_window. */
w->desired_matrix->no_scrolling_p = 1;
#if GLYPH_DEBUG
debug_method_add (w, "try_window_reusing_current_matrix 1");
#endif
return 1;
}
else if (CHARPOS (new_start) > CHARPOS (start))
{
struct glyph_row *pt_row, *row;
struct glyph_row *first_reusable_row;
struct glyph_row *first_row_to_display;
int dy;
int yb = window_text_bottom_y (w);
/* Find the row starting at new_start, if there is one. Don't
reuse a partially visible line at the end. */
first_reusable_row = start_row;
while (first_reusable_row->enabled_p
&& MATRIX_ROW_BOTTOM_Y (first_reusable_row) < yb
&& (MATRIX_ROW_START_CHARPOS (first_reusable_row)
< CHARPOS (new_start)))
++first_reusable_row;
/* Give up if there is no row to reuse. */
if (MATRIX_ROW_BOTTOM_Y (first_reusable_row) >= yb
|| !first_reusable_row->enabled_p
|| (MATRIX_ROW_START_CHARPOS (first_reusable_row)
!= CHARPOS (new_start)))
return 0;
/* We can reuse fully visible rows beginning with
first_reusable_row to the end of the window. Set
first_row_to_display to the first row that cannot be reused.
Set pt_row to the row containing point, if there is any. */
pt_row = NULL;
for (first_row_to_display = first_reusable_row;
MATRIX_ROW_BOTTOM_Y (first_row_to_display) < yb;
++first_row_to_display)
{
if (PT >= MATRIX_ROW_START_CHARPOS (first_row_to_display)
&& PT < MATRIX_ROW_END_CHARPOS (first_row_to_display))
pt_row = first_row_to_display;
}
/* Start displaying at the start of first_row_to_display. */
xassert (first_row_to_display->y < yb);
init_to_row_start (&it, w, first_row_to_display);
nrows_scrolled = (MATRIX_ROW_VPOS (first_reusable_row, w->current_matrix)
- start_vpos);
it.vpos = (MATRIX_ROW_VPOS (first_row_to_display, w->current_matrix)
- nrows_scrolled);
it.current_y = (first_row_to_display->y - first_reusable_row->y
+ WINDOW_HEADER_LINE_HEIGHT (w));
/* Display lines beginning with first_row_to_display in the
desired matrix. Set last_text_row to the last row displayed
that displays text. */
it.glyph_row = MATRIX_ROW (w->desired_matrix, it.vpos);
if (pt_row == NULL)
w->cursor.vpos = -1;
last_text_row = NULL;
while (it.current_y < it.last_visible_y && !fonts_changed_p)
if (display_line (&it))
last_text_row = it.glyph_row - 1;
/* If point is in a reused row, adjust y and vpos of the cursor
position. */
if (pt_row)
{
w->cursor.vpos -= nrows_scrolled;
w->cursor.y -= first_reusable_row->y - start_row->y;
}
/* Give up if point isn't in a row displayed or reused. (This
also handles the case where w->cursor.vpos < nrows_scrolled
after the calls to display_line, which can happen with scroll
margins. See bug#1295.) */
if (w->cursor.vpos < 0)
{
clear_glyph_matrix (w->desired_matrix);
return 0;
}
/* Scroll the display. */
run.current_y = first_reusable_row->y;
run.desired_y = WINDOW_HEADER_LINE_HEIGHT (w);
run.height = it.last_visible_y - run.current_y;
dy = run.current_y - run.desired_y;
if (run.height)
{
update_begin (f);
FRAME_RIF (f)->update_window_begin_hook (w);
FRAME_RIF (f)->clear_window_mouse_face (w);
FRAME_RIF (f)->scroll_run_hook (w, &run);
FRAME_RIF (f)->update_window_end_hook (w, 0, 0);
update_end (f);
}
/* Adjust Y positions of reused rows. */
bottom_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w);
min_y = WINDOW_HEADER_LINE_HEIGHT (w);
max_y = it.last_visible_y;
for (row = first_reusable_row; row < first_row_to_display; ++row)
{
row->y -= dy;
row->visible_height = row->height;
if (row->y < min_y)
row->visible_height -= min_y - row->y;
if (row->y + row->height > max_y)
row->visible_height -= row->y + row->height - max_y;
row->redraw_fringe_bitmaps_p = 1;
}
/* Scroll the current matrix. */
xassert (nrows_scrolled > 0);
rotate_matrix (w->current_matrix,
start_vpos,
MATRIX_ROW_VPOS (bottom_row, w->current_matrix),
-nrows_scrolled);
/* Disable rows not reused. */
for (row -= nrows_scrolled; row < bottom_row; ++row)
row->enabled_p = 0;
/* Point may have moved to a different line, so we cannot assume that
the previous cursor position is valid; locate the correct row. */
if (pt_row)
{
for (row = MATRIX_ROW (w->current_matrix, w->cursor.vpos);
row < bottom_row && PT >= MATRIX_ROW_END_CHARPOS (row);
row++)
{
w->cursor.vpos++;
w->cursor.y = row->y;
}
if (row < bottom_row)
{
struct glyph *glyph = row->glyphs[TEXT_AREA] + w->cursor.hpos;
struct glyph *end = glyph + row->used[TEXT_AREA];
for (; glyph < end
&& (!BUFFERP (glyph->object)
|| glyph->charpos < PT);
glyph++)
{
w->cursor.hpos++;
w->cursor.x += glyph->pixel_width;
}
}
}
/* Adjust window end. A null value of last_text_row means that
the window end is in reused rows which in turn means that
only its vpos can have changed. */
if (last_text_row)
{
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row);
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (last_text_row));
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (last_text_row, w->desired_matrix));
}
else
{
w->window_end_vpos
= make_number (XFASTINT (w->window_end_vpos) - nrows_scrolled);
}
w->window_end_valid = Qnil;
w->desired_matrix->no_scrolling_p = 1;
#if GLYPH_DEBUG
debug_method_add (w, "try_window_reusing_current_matrix 2");
#endif
return 1;
}
return 0;
}
/************************************************************************
Window redisplay reusing current matrix when buffer has changed
************************************************************************/
static struct glyph_row *find_last_unchanged_at_beg_row P_ ((struct window *));
static struct glyph_row *find_first_unchanged_at_end_row P_ ((struct window *,
int *, int *));
static struct glyph_row *
find_last_row_displaying_text P_ ((struct glyph_matrix *, struct it *,
struct glyph_row *));
/* Return the last row in MATRIX displaying text. If row START is
non-null, start searching with that row. IT gives the dimensions
of the display. Value is null if matrix is empty; otherwise it is
a pointer to the row found. */
static struct glyph_row *
find_last_row_displaying_text (matrix, it, start)
struct glyph_matrix *matrix;
struct it *it;
struct glyph_row *start;
{
struct glyph_row *row, *row_found;
/* Set row_found to the last row in IT->w's current matrix
displaying text. The loop looks funny but think of partially
visible lines. */
row_found = NULL;
row = start ? start : MATRIX_FIRST_TEXT_ROW (matrix);
while (MATRIX_ROW_DISPLAYS_TEXT_P (row))
{
xassert (row->enabled_p);
row_found = row;
if (MATRIX_ROW_BOTTOM_Y (row) >= it->last_visible_y)
break;
++row;
}
return row_found;
}
/* Return the last row in the current matrix of W that is not affected
by changes at the start of current_buffer that occurred since W's
current matrix was built. Value is null if no such row exists.
BEG_UNCHANGED us the number of characters unchanged at the start of
current_buffer. BEG + BEG_UNCHANGED is the buffer position of the
first changed character in current_buffer. Characters at positions <
BEG + BEG_UNCHANGED are at the same buffer positions as they were
when the current matrix was built. */
static struct glyph_row *
find_last_unchanged_at_beg_row (w)
struct window *w;
{
int first_changed_pos = BEG + BEG_UNCHANGED;
struct glyph_row *row;
struct glyph_row *row_found = NULL;
int yb = window_text_bottom_y (w);
/* Find the last row displaying unchanged text. */
for (row = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
MATRIX_ROW_DISPLAYS_TEXT_P (row)
&& MATRIX_ROW_START_CHARPOS (row) < first_changed_pos;
++row)
{
if (/* If row ends before first_changed_pos, it is unchanged,
except in some case. */
MATRIX_ROW_END_CHARPOS (row) <= first_changed_pos
/* When row ends in ZV and we write at ZV it is not
unchanged. */
&& !row->ends_at_zv_p
/* When first_changed_pos is the end of a continued line,
row is not unchanged because it may be no longer
continued. */
&& !(MATRIX_ROW_END_CHARPOS (row) == first_changed_pos
&& (row->continued_p
|| row->exact_window_width_line_p)))
row_found = row;
/* Stop if last visible row. */
if (MATRIX_ROW_BOTTOM_Y (row) >= yb)
break;
}
return row_found;
}
/* Find the first glyph row in the current matrix of W that is not
affected by changes at the end of current_buffer since the
time W's current matrix was built.
Return in *DELTA the number of chars by which buffer positions in
unchanged text at the end of current_buffer must be adjusted.
Return in *DELTA_BYTES the corresponding number of bytes.
Value is null if no such row exists, i.e. all rows are affected by
changes. */
static struct glyph_row *
find_first_unchanged_at_end_row (w, delta, delta_bytes)
struct window *w;
int *delta, *delta_bytes;
{
struct glyph_row *row;
struct glyph_row *row_found = NULL;
*delta = *delta_bytes = 0;
/* Display must not have been paused, otherwise the current matrix
is not up to date. */
eassert (!NILP (w->window_end_valid));
/* A value of window_end_pos >= END_UNCHANGED means that the window
end is in the range of changed text. If so, there is no
unchanged row at the end of W's current matrix. */
if (XFASTINT (w->window_end_pos) >= END_UNCHANGED)
return NULL;
/* Set row to the last row in W's current matrix displaying text. */
row = MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos));
/* If matrix is entirely empty, no unchanged row exists. */
if (MATRIX_ROW_DISPLAYS_TEXT_P (row))
{
/* The value of row is the last glyph row in the matrix having a
meaningful buffer position in it. The end position of row
corresponds to window_end_pos. This allows us to translate
buffer positions in the current matrix to current buffer
positions for characters not in changed text. */
int Z_old = MATRIX_ROW_END_CHARPOS (row) + XFASTINT (w->window_end_pos);
int Z_BYTE_old = MATRIX_ROW_END_BYTEPOS (row) + w->window_end_bytepos;
int last_unchanged_pos, last_unchanged_pos_old;
struct glyph_row *first_text_row
= MATRIX_FIRST_TEXT_ROW (w->current_matrix);
*delta = Z - Z_old;
*delta_bytes = Z_BYTE - Z_BYTE_old;
/* Set last_unchanged_pos to the buffer position of the last
character in the buffer that has not been changed. Z is the
index + 1 of the last character in current_buffer, i.e. by
subtracting END_UNCHANGED we get the index of the last
unchanged character, and we have to add BEG to get its buffer
position. */
last_unchanged_pos = Z - END_UNCHANGED + BEG;
last_unchanged_pos_old = last_unchanged_pos - *delta;
/* Search backward from ROW for a row displaying a line that
starts at a minimum position >= last_unchanged_pos_old. */
for (; row > first_text_row; --row)
{
/* This used to abort, but it can happen.
It is ok to just stop the search instead here. KFS. */
if (!row->enabled_p || !MATRIX_ROW_DISPLAYS_TEXT_P (row))
break;
if (MATRIX_ROW_START_CHARPOS (row) >= last_unchanged_pos_old)
row_found = row;
}
}
eassert (!row_found || MATRIX_ROW_DISPLAYS_TEXT_P (row_found));
return row_found;
}
/* Make sure that glyph rows in the current matrix of window W
reference the same glyph memory as corresponding rows in the
frame's frame matrix. This function is called after scrolling W's
current matrix on a terminal frame in try_window_id and
try_window_reusing_current_matrix. */
static void
sync_frame_with_window_matrix_rows (w)
struct window *w;
{
struct frame *f = XFRAME (w->frame);
struct glyph_row *window_row, *window_row_end, *frame_row;
/* Preconditions: W must be a leaf window and full-width. Its frame
must have a frame matrix. */
xassert (NILP (w->hchild) && NILP (w->vchild));
xassert (WINDOW_FULL_WIDTH_P (w));
xassert (!FRAME_WINDOW_P (f));
/* If W is a full-width window, glyph pointers in W's current matrix
have, by definition, to be the same as glyph pointers in the
corresponding frame matrix. Note that frame matrices have no
marginal areas (see build_frame_matrix). */
window_row = w->current_matrix->rows;
window_row_end = window_row + w->current_matrix->nrows;
frame_row = f->current_matrix->rows + WINDOW_TOP_EDGE_LINE (w);
while (window_row < window_row_end)
{
struct glyph *start = window_row->glyphs[LEFT_MARGIN_AREA];
struct glyph *end = window_row->glyphs[LAST_AREA];
frame_row->glyphs[LEFT_MARGIN_AREA] = start;
frame_row->glyphs[TEXT_AREA] = start;
frame_row->glyphs[RIGHT_MARGIN_AREA] = end;
frame_row->glyphs[LAST_AREA] = end;
/* Disable frame rows whose corresponding window rows have
been disabled in try_window_id. */
if (!window_row->enabled_p)
frame_row->enabled_p = 0;
++window_row, ++frame_row;
}
}
/* Find the glyph row in window W containing CHARPOS. Consider all
rows between START and END (not inclusive). END null means search
all rows to the end of the display area of W. Value is the row
containing CHARPOS or null. */
struct glyph_row *
row_containing_pos (w, charpos, start, end, dy)
struct window *w;
int charpos;
struct glyph_row *start, *end;
int dy;
{
struct glyph_row *row = start;
int last_y;
/* If we happen to start on a header-line, skip that. */
if (row->mode_line_p)
++row;
if ((end && row >= end) || !row->enabled_p)
return NULL;
last_y = window_text_bottom_y (w) - dy;
while (1)
{
/* Give up if we have gone too far. */
if (end && row >= end)
return NULL;
/* This formerly returned if they were equal.
I think that both quantities are of a "last plus one" type;
if so, when they are equal, the row is within the screen. -- rms. */
if (MATRIX_ROW_BOTTOM_Y (row) > last_y)
return NULL;
/* If it is in this row, return this row. */
if (! (MATRIX_ROW_END_CHARPOS (row) < charpos
|| (MATRIX_ROW_END_CHARPOS (row) == charpos
/* The end position of a row equals the start
position of the next row. If CHARPOS is there, we
would rather display it in the next line, except
when this line ends in ZV. */
&& !row->ends_at_zv_p
&& !MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row)))
&& charpos >= MATRIX_ROW_START_CHARPOS (row))
return row;
++row;
}
}
/* Try to redisplay window W by reusing its existing display. W's
current matrix must be up to date when this function is called,
i.e. window_end_valid must not be nil.
Value is
1 if display has been updated
0 if otherwise unsuccessful
-1 if redisplay with same window start is known not to succeed
The following steps are performed:
1. Find the last row in the current matrix of W that is not
affected by changes at the start of current_buffer. If no such row
is found, give up.
2. Find the first row in W's current matrix that is not affected by
changes at the end of current_buffer. Maybe there is no such row.
3. Display lines beginning with the row + 1 found in step 1 to the
row found in step 2 or, if step 2 didn't find a row, to the end of
the window.
4. If cursor is not known to appear on the window, give up.
5. If display stopped at the row found in step 2, scroll the
display and current matrix as needed.
6. Maybe display some lines at the end of W, if we must. This can
happen under various circumstances, like a partially visible line
becoming fully visible, or because newly displayed lines are displayed
in smaller font sizes.
7. Update W's window end information. */
static int
try_window_id (w)
struct window *w;
{
struct frame *f = XFRAME (w->frame);
struct glyph_matrix *current_matrix = w->current_matrix;
struct glyph_matrix *desired_matrix = w->desired_matrix;
struct glyph_row *last_unchanged_at_beg_row;
struct glyph_row *first_unchanged_at_end_row;
struct glyph_row *row;
struct glyph_row *bottom_row;
int bottom_vpos;
struct it it;
int delta = 0, delta_bytes = 0, stop_pos, dvpos, dy;
struct text_pos start_pos;
struct run run;
int first_unchanged_at_end_vpos = 0;
struct glyph_row *last_text_row, *last_text_row_at_end;
struct text_pos start;
int first_changed_charpos, last_changed_charpos;
#if GLYPH_DEBUG
if (inhibit_try_window_id)
return 0;
#endif
/* This is handy for debugging. */
#if 0
#define GIVE_UP(X) \
do { \
fprintf (stderr, "try_window_id give up %d\n", (X)); \
return 0; \
} while (0)
#else
#define GIVE_UP(X) return 0
#endif
SET_TEXT_POS_FROM_MARKER (start, w->start);
/* Don't use this for mini-windows because these can show
messages and mini-buffers, and we don't handle that here. */
if (MINI_WINDOW_P (w))
GIVE_UP (1);
/* This flag is used to prevent redisplay optimizations. */
if (windows_or_buffers_changed || cursor_type_changed)
GIVE_UP (2);
/* Verify that narrowing has not changed.
Also verify that we were not told to prevent redisplay optimizations.
It would be nice to further
reduce the number of cases where this prevents try_window_id. */
if (current_buffer->clip_changed
|| current_buffer->prevent_redisplay_optimizations_p)
GIVE_UP (3);
/* Window must either use window-based redisplay or be full width. */
if (!FRAME_WINDOW_P (f)
&& (!FRAME_LINE_INS_DEL_OK (f)
|| !WINDOW_FULL_WIDTH_P (w)))
GIVE_UP (4);
/* Give up if point is known NOT to appear in W. */
if (PT < CHARPOS (start))
GIVE_UP (5);
/* Another way to prevent redisplay optimizations. */
if (XFASTINT (w->last_modified) == 0)
GIVE_UP (6);
/* Verify that window is not hscrolled. */
if (XFASTINT (w->hscroll) != 0)
GIVE_UP (7);
/* Verify that display wasn't paused. */
if (NILP (w->window_end_valid))
GIVE_UP (8);
/* Can't use this if highlighting a region because a cursor movement
will do more than just set the cursor. */
if (!NILP (Vtransient_mark_mode)
&& !NILP (current_buffer->mark_active))
GIVE_UP (9);
/* Likewise if highlighting trailing whitespace. */
if (!NILP (Vshow_trailing_whitespace))
GIVE_UP (11);
/* Likewise if showing a region. */
if (!NILP (w->region_showing))
GIVE_UP (10);
/* Can't use this if overlay arrow position and/or string have
changed. */
if (overlay_arrows_changed_p ())
GIVE_UP (12);
/* When word-wrap is on, adding a space to the first word of a
wrapped line can change the wrap position, altering the line
above it. It might be worthwhile to handle this more
intelligently, but for now just redisplay from scratch. */
if (!NILP (XBUFFER (w->buffer)->word_wrap))
GIVE_UP (21);
/* Make sure beg_unchanged and end_unchanged are up to date. Do it
only if buffer has really changed. The reason is that the gap is
initially at Z for freshly visited files. The code below would
set end_unchanged to 0 in that case. */
if (MODIFF > SAVE_MODIFF
/* This seems to happen sometimes after saving a buffer. */
|| BEG_UNCHANGED + END_UNCHANGED > Z_BYTE)
{
if (GPT - BEG < BEG_UNCHANGED)
BEG_UNCHANGED = GPT - BEG;
if (Z - GPT < END_UNCHANGED)
END_UNCHANGED = Z - GPT;
}
/* The position of the first and last character that has been changed. */
first_changed_charpos = BEG + BEG_UNCHANGED;
last_changed_charpos = Z - END_UNCHANGED;
/* If window starts after a line end, and the last change is in
front of that newline, then changes don't affect the display.
This case happens with stealth-fontification. Note that although
the display is unchanged, glyph positions in the matrix have to
be adjusted, of course. */
row = MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos));
if (MATRIX_ROW_DISPLAYS_TEXT_P (row)
&& ((last_changed_charpos < CHARPOS (start)
&& CHARPOS (start) == BEGV)
|| (last_changed_charpos < CHARPOS (start) - 1
&& FETCH_BYTE (BYTEPOS (start) - 1) == '\n')))
{
int Z_old, delta, Z_BYTE_old, delta_bytes;
struct glyph_row *r0;
/* Compute how many chars/bytes have been added to or removed
from the buffer. */
Z_old = MATRIX_ROW_END_CHARPOS (row) + XFASTINT (w->window_end_pos);
Z_BYTE_old = MATRIX_ROW_END_BYTEPOS (row) + w->window_end_bytepos;
delta = Z - Z_old;
delta_bytes = Z_BYTE - Z_BYTE_old;
/* Give up if PT is not in the window. Note that it already has
been checked at the start of try_window_id that PT is not in
front of the window start. */
if (PT >= MATRIX_ROW_END_CHARPOS (row) + delta)
GIVE_UP (13);
/* If window start is unchanged, we can reuse the whole matrix
as is, after adjusting glyph positions. No need to compute
the window end again, since its offset from Z hasn't changed. */
r0 = MATRIX_FIRST_TEXT_ROW (current_matrix);
if (CHARPOS (start) == MATRIX_ROW_START_CHARPOS (r0) + delta
&& BYTEPOS (start) == MATRIX_ROW_START_BYTEPOS (r0) + delta_bytes
/* PT must not be in a partially visible line. */
&& !(PT >= MATRIX_ROW_START_CHARPOS (row) + delta
&& MATRIX_ROW_BOTTOM_Y (row) > window_text_bottom_y (w)))
{
/* Adjust positions in the glyph matrix. */
if (delta || delta_bytes)
{
struct glyph_row *r1
= MATRIX_BOTTOM_TEXT_ROW (current_matrix, w);
increment_matrix_positions (w->current_matrix,
MATRIX_ROW_VPOS (r0, current_matrix),
MATRIX_ROW_VPOS (r1, current_matrix),
delta, delta_bytes);
}
/* Set the cursor. */
row = row_containing_pos (w, PT, r0, NULL, 0);
if (row)
set_cursor_from_row (w, row, current_matrix, 0, 0, 0, 0);
else
abort ();
return 1;
}
}
/* Handle the case that changes are all below what is displayed in
the window, and that PT is in the window. This shortcut cannot
be taken if ZV is visible in the window, and text has been added
there that is visible in the window. */
if (first_changed_charpos >= MATRIX_ROW_END_CHARPOS (row)
/* ZV is not visible in the window, or there are no
changes at ZV, actually. */
&& (current_matrix->zv > MATRIX_ROW_END_CHARPOS (row)
|| first_changed_charpos == last_changed_charpos))
{
struct glyph_row *r0;
/* Give up if PT is not in the window. Note that it already has
been checked at the start of try_window_id that PT is not in
front of the window start. */
if (PT >= MATRIX_ROW_END_CHARPOS (row))
GIVE_UP (14);
/* If window start is unchanged, we can reuse the whole matrix
as is, without changing glyph positions since no text has
been added/removed in front of the window end. */
r0 = MATRIX_FIRST_TEXT_ROW (current_matrix);
if (TEXT_POS_EQUAL_P (start, r0->start.pos)
/* PT must not be in a partially visible line. */
&& !(PT >= MATRIX_ROW_START_CHARPOS (row)
&& MATRIX_ROW_BOTTOM_Y (row) > window_text_bottom_y (w)))
{
/* We have to compute the window end anew since text
can have been added/removed after it. */
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (row));
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (row);
/* Set the cursor. */
row = row_containing_pos (w, PT, r0, NULL, 0);
if (row)
set_cursor_from_row (w, row, current_matrix, 0, 0, 0, 0);
else
abort ();
return 2;
}
}
/* Give up if window start is in the changed area.
The condition used to read
(BEG_UNCHANGED + END_UNCHANGED != Z - BEG && ...)
but why that was tested escapes me at the moment. */
if (CHARPOS (start) >= first_changed_charpos
&& CHARPOS (start) <= last_changed_charpos)
GIVE_UP (15);
/* Check that window start agrees with the start of the first glyph
row in its current matrix. Check this after we know the window
start is not in changed text, otherwise positions would not be
comparable. */
row = MATRIX_FIRST_TEXT_ROW (current_matrix);
if (!TEXT_POS_EQUAL_P (start, row->start.pos))
GIVE_UP (16);
/* Give up if the window ends in strings. Overlay strings
at the end are difficult to handle, so don't try. */
row = MATRIX_ROW (current_matrix, XFASTINT (w->window_end_vpos));
if (MATRIX_ROW_START_CHARPOS (row) == MATRIX_ROW_END_CHARPOS (row))
GIVE_UP (20);
/* Compute the position at which we have to start displaying new
lines. Some of the lines at the top of the window might be
reusable because they are not displaying changed text. Find the
last row in W's current matrix not affected by changes at the
start of current_buffer. Value is null if changes start in the
first line of window. */
last_unchanged_at_beg_row = find_last_unchanged_at_beg_row (w);
if (last_unchanged_at_beg_row)
{
/* Avoid starting to display in the moddle of a character, a TAB
for instance. This is easier than to set up the iterator
exactly, and it's not a frequent case, so the additional
effort wouldn't really pay off. */
while ((MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (last_unchanged_at_beg_row)
|| last_unchanged_at_beg_row->ends_in_newline_from_string_p)
&& last_unchanged_at_beg_row > w->current_matrix->rows)
--last_unchanged_at_beg_row;
if (MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (last_unchanged_at_beg_row))
GIVE_UP (17);
if (init_to_row_end (&it, w, last_unchanged_at_beg_row) == 0)
GIVE_UP (18);
start_pos = it.current.pos;
/* Start displaying new lines in the desired matrix at the same
vpos we would use in the current matrix, i.e. below
last_unchanged_at_beg_row. */
it.vpos = 1 + MATRIX_ROW_VPOS (last_unchanged_at_beg_row,
current_matrix);
it.glyph_row = MATRIX_ROW (desired_matrix, it.vpos);
it.current_y = MATRIX_ROW_BOTTOM_Y (last_unchanged_at_beg_row);
xassert (it.hpos == 0 && it.current_x == 0);
}
else
{
/* There are no reusable lines at the start of the window.
Start displaying in the first text line. */
start_display (&it, w, start);
it.vpos = it.first_vpos;
start_pos = it.current.pos;
}
/* Find the first row that is not affected by changes at the end of
the buffer. Value will be null if there is no unchanged row, in
which case we must redisplay to the end of the window. delta
will be set to the value by which buffer positions beginning with
first_unchanged_at_end_row have to be adjusted due to text
changes. */
first_unchanged_at_end_row
= find_first_unchanged_at_end_row (w, &delta, &delta_bytes);
IF_DEBUG (debug_delta = delta);
IF_DEBUG (debug_delta_bytes = delta_bytes);
/* Set stop_pos to the buffer position up to which we will have to
display new lines. If first_unchanged_at_end_row != NULL, this
is the buffer position of the start of the line displayed in that
row. For first_unchanged_at_end_row == NULL, use 0 to indicate
that we don't stop at a buffer position. */
stop_pos = 0;
if (first_unchanged_at_end_row)
{
xassert (last_unchanged_at_beg_row == NULL
|| first_unchanged_at_end_row >= last_unchanged_at_beg_row);
/* If this is a continuation line, move forward to the next one
that isn't. Changes in lines above affect this line.
Caution: this may move first_unchanged_at_end_row to a row
not displaying text. */
while (MATRIX_ROW_CONTINUATION_LINE_P (first_unchanged_at_end_row)
&& MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row)
&& (MATRIX_ROW_BOTTOM_Y (first_unchanged_at_end_row)
< it.last_visible_y))
++first_unchanged_at_end_row;
if (!MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row)
|| (MATRIX_ROW_BOTTOM_Y (first_unchanged_at_end_row)
>= it.last_visible_y))
first_unchanged_at_end_row = NULL;
else
{
stop_pos = (MATRIX_ROW_START_CHARPOS (first_unchanged_at_end_row)
+ delta);
first_unchanged_at_end_vpos
= MATRIX_ROW_VPOS (first_unchanged_at_end_row, current_matrix);
xassert (stop_pos >= Z - END_UNCHANGED);
}
}
else if (last_unchanged_at_beg_row == NULL)
GIVE_UP (19);
#if GLYPH_DEBUG
/* Either there is no unchanged row at the end, or the one we have
now displays text. This is a necessary condition for the window
end pos calculation at the end of this function. */
xassert (first_unchanged_at_end_row == NULL
|| MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row));
debug_last_unchanged_at_beg_vpos
= (last_unchanged_at_beg_row
? MATRIX_ROW_VPOS (last_unchanged_at_beg_row, current_matrix)
: -1);
debug_first_unchanged_at_end_vpos = first_unchanged_at_end_vpos;
#endif /* GLYPH_DEBUG != 0 */
/* Display new lines. Set last_text_row to the last new line
displayed which has text on it, i.e. might end up as being the
line where the window_end_vpos is. */
w->cursor.vpos = -1;
last_text_row = NULL;
overlay_arrow_seen = 0;
while (it.current_y < it.last_visible_y
&& !fonts_changed_p
&& (first_unchanged_at_end_row == NULL
|| IT_CHARPOS (it) < stop_pos))
{
if (display_line (&it))
last_text_row = it.glyph_row - 1;
}
if (fonts_changed_p)
return -1;
/* Compute differences in buffer positions, y-positions etc. for
lines reused at the bottom of the window. Compute what we can
scroll. */
if (first_unchanged_at_end_row
/* No lines reused because we displayed everything up to the
bottom of the window. */
&& it.current_y < it.last_visible_y)
{
dvpos = (it.vpos
- MATRIX_ROW_VPOS (first_unchanged_at_end_row,
current_matrix));
dy = it.current_y - first_unchanged_at_end_row->y;
run.current_y = first_unchanged_at_end_row->y;
run.desired_y = run.current_y + dy;
run.height = it.last_visible_y - max (run.current_y, run.desired_y);
}
else
{
delta = delta_bytes = dvpos = dy
= run.current_y = run.desired_y = run.height = 0;
first_unchanged_at_end_row = NULL;
}
IF_DEBUG (debug_dvpos = dvpos; debug_dy = dy);
/* Find the cursor if not already found. We have to decide whether
PT will appear on this window (it sometimes doesn't, but this is
not a very frequent case.) This decision has to be made before
the current matrix is altered. A value of cursor.vpos < 0 means
that PT is either in one of the lines beginning at
first_unchanged_at_end_row or below the window. Don't care for
lines that might be displayed later at the window end; as
mentioned, this is not a frequent case. */
if (w->cursor.vpos < 0)
{
/* Cursor in unchanged rows at the top? */
if (PT < CHARPOS (start_pos)
&& last_unchanged_at_beg_row)
{
row = row_containing_pos (w, PT,
MATRIX_FIRST_TEXT_ROW (w->current_matrix),
last_unchanged_at_beg_row + 1, 0);
if (row)
set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0);
}
/* Start from first_unchanged_at_end_row looking for PT. */
else if (first_unchanged_at_end_row)
{
row = row_containing_pos (w, PT - delta,
first_unchanged_at_end_row, NULL, 0);
if (row)
set_cursor_from_row (w, row, w->current_matrix, delta,
delta_bytes, dy, dvpos);
}
/* Give up if cursor was not found. */
if (w->cursor.vpos < 0)
{
clear_glyph_matrix (w->desired_matrix);
return -1;
}
}
/* Don't let the cursor end in the scroll margins. */
{
int this_scroll_margin, cursor_height;
this_scroll_margin = max (0, scroll_margin);
this_scroll_margin = min (this_scroll_margin, WINDOW_TOTAL_LINES (w) / 4);
this_scroll_margin *= FRAME_LINE_HEIGHT (it.f);
cursor_height = MATRIX_ROW (w->desired_matrix, w->cursor.vpos)->height;
if ((w->cursor.y < this_scroll_margin
&& CHARPOS (start) > BEGV)
/* Old redisplay didn't take scroll margin into account at the bottom,
but then global-hl-line-mode doesn't scroll. KFS 2004-06-14 */
|| (w->cursor.y + (make_cursor_line_fully_visible_p
? cursor_height + this_scroll_margin
: 1)) > it.last_visible_y)
{
w->cursor.vpos = -1;
clear_glyph_matrix (w->desired_matrix);
return -1;
}
}
/* Scroll the display. Do it before changing the current matrix so
that xterm.c doesn't get confused about where the cursor glyph is
found. */
if (dy && run.height)
{
update_begin (f);
if (FRAME_WINDOW_P (f))
{
FRAME_RIF (f)->update_window_begin_hook (w);
FRAME_RIF (f)->clear_window_mouse_face (w);
FRAME_RIF (f)->scroll_run_hook (w, &run);
FRAME_RIF (f)->update_window_end_hook (w, 0, 0);
}
else
{
/* Terminal frame. In this case, dvpos gives the number of
lines to scroll by; dvpos < 0 means scroll up. */
int first_unchanged_at_end_vpos
= MATRIX_ROW_VPOS (first_unchanged_at_end_row, w->current_matrix);
int from = WINDOW_TOP_EDGE_LINE (w) + first_unchanged_at_end_vpos;
int end = (WINDOW_TOP_EDGE_LINE (w)
+ (WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0)
+ window_internal_height (w));
/* Perform the operation on the screen. */
if (dvpos > 0)
{
/* Scroll last_unchanged_at_beg_row to the end of the
window down dvpos lines. */
set_terminal_window (f, end);
/* On dumb terminals delete dvpos lines at the end
before inserting dvpos empty lines. */
if (!FRAME_SCROLL_REGION_OK (f))
ins_del_lines (f, end - dvpos, -dvpos);
/* Insert dvpos empty lines in front of
last_unchanged_at_beg_row. */
ins_del_lines (f, from, dvpos);
}
else if (dvpos < 0)
{
/* Scroll up last_unchanged_at_beg_vpos to the end of
the window to last_unchanged_at_beg_vpos - |dvpos|. */
set_terminal_window (f, end);
/* Delete dvpos lines in front of
last_unchanged_at_beg_vpos. ins_del_lines will set
the cursor to the given vpos and emit |dvpos| delete
line sequences. */
ins_del_lines (f, from + dvpos, dvpos);
/* On a dumb terminal insert dvpos empty lines at the
end. */
if (!FRAME_SCROLL_REGION_OK (f))
ins_del_lines (f, end + dvpos, -dvpos);
}
set_terminal_window (f, 0);
}
update_end (f);
}
/* Shift reused rows of the current matrix to the right position.
BOTTOM_ROW is the last + 1 row in the current matrix reserved for
text. */
bottom_row = MATRIX_BOTTOM_TEXT_ROW (current_matrix, w);
bottom_vpos = MATRIX_ROW_VPOS (bottom_row, current_matrix);
if (dvpos < 0)
{
rotate_matrix (current_matrix, first_unchanged_at_end_vpos + dvpos,
bottom_vpos, dvpos);
enable_glyph_matrix_rows (current_matrix, bottom_vpos + dvpos,
bottom_vpos, 0);
}
else if (dvpos > 0)
{
rotate_matrix (current_matrix, first_unchanged_at_end_vpos,
bottom_vpos, dvpos);
enable_glyph_matrix_rows (current_matrix, first_unchanged_at_end_vpos,
first_unchanged_at_end_vpos + dvpos, 0);
}
/* For frame-based redisplay, make sure that current frame and window
matrix are in sync with respect to glyph memory. */
if (!FRAME_WINDOW_P (f))
sync_frame_with_window_matrix_rows (w);
/* Adjust buffer positions in reused rows. */
if (delta || delta_bytes)
increment_matrix_positions (current_matrix,
first_unchanged_at_end_vpos + dvpos,
bottom_vpos, delta, delta_bytes);
/* Adjust Y positions. */
if (dy)
shift_glyph_matrix (w, current_matrix,
first_unchanged_at_end_vpos + dvpos,
bottom_vpos, dy);
if (first_unchanged_at_end_row)
{
first_unchanged_at_end_row += dvpos;
if (first_unchanged_at_end_row->y >= it.last_visible_y
|| !MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row))
first_unchanged_at_end_row = NULL;
}
/* If scrolling up, there may be some lines to display at the end of
the window. */
last_text_row_at_end = NULL;
if (dy < 0)
{
/* Scrolling up can leave for example a partially visible line
at the end of the window to be redisplayed. */
/* Set last_row to the glyph row in the current matrix where the
window end line is found. It has been moved up or down in
the matrix by dvpos. */
int last_vpos = XFASTINT (w->window_end_vpos) + dvpos;
struct glyph_row *last_row = MATRIX_ROW (current_matrix, last_vpos);
/* If last_row is the window end line, it should display text. */
xassert (last_row->displays_text_p);
/* If window end line was partially visible before, begin
displaying at that line. Otherwise begin displaying with the
line following it. */
if (MATRIX_ROW_BOTTOM_Y (last_row) - dy >= it.last_visible_y)
{
init_to_row_start (&it, w, last_row);
it.vpos = last_vpos;
it.current_y = last_row->y;
}
else
{
init_to_row_end (&it, w, last_row);
it.vpos = 1 + last_vpos;
it.current_y = MATRIX_ROW_BOTTOM_Y (last_row);
++last_row;
}
/* We may start in a continuation line. If so, we have to
get the right continuation_lines_width and current_x. */
it.continuation_lines_width = last_row->continuation_lines_width;
it.hpos = it.current_x = 0;
/* Display the rest of the lines at the window end. */
it.glyph_row = MATRIX_ROW (desired_matrix, it.vpos);
while (it.current_y < it.last_visible_y
&& !fonts_changed_p)
{
/* Is it always sure that the display agrees with lines in
the current matrix? I don't think so, so we mark rows
displayed invalid in the current matrix by setting their
enabled_p flag to zero. */
MATRIX_ROW (w->current_matrix, it.vpos)->enabled_p = 0;
if (display_line (&it))
last_text_row_at_end = it.glyph_row - 1;
}
}
/* Update window_end_pos and window_end_vpos. */
if (first_unchanged_at_end_row
&& !last_text_row_at_end)
{
/* Window end line if one of the preserved rows from the current
matrix. Set row to the last row displaying text in current
matrix starting at first_unchanged_at_end_row, after
scrolling. */
xassert (first_unchanged_at_end_row->displays_text_p);
row = find_last_row_displaying_text (w->current_matrix, &it,
first_unchanged_at_end_row);
xassert (row && MATRIX_ROW_DISPLAYS_TEXT_P (row));
w->window_end_pos = make_number (Z - MATRIX_ROW_END_CHARPOS (row));
w->window_end_bytepos = Z_BYTE - MATRIX_ROW_END_BYTEPOS (row);
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (row, w->current_matrix));
xassert (w->window_end_bytepos >= 0);
IF_DEBUG (debug_method_add (w, "A"));
}
else if (last_text_row_at_end)
{
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (last_text_row_at_end));
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row_at_end);
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (last_text_row_at_end, desired_matrix));
xassert (w->window_end_bytepos >= 0);
IF_DEBUG (debug_method_add (w, "B"));
}
else if (last_text_row)
{
/* We have displayed either to the end of the window or at the
end of the window, i.e. the last row with text is to be found
in the desired matrix. */
w->window_end_pos
= make_number (Z - MATRIX_ROW_END_CHARPOS (last_text_row));
w->window_end_bytepos
= Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row);
w->window_end_vpos
= make_number (MATRIX_ROW_VPOS (last_text_row, desired_matrix));
xassert (w->window_end_bytepos >= 0);
}
else if (first_unchanged_at_end_row == NULL
&& last_text_row == NULL
&& last_text_row_at_end == NULL)
{
/* Displayed to end of window, but no line containing text was
displayed. Lines were deleted at the end of the window. */
int first_vpos = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0;
int vpos = XFASTINT (w->window_end_vpos);
struct glyph_row *current_row = current_matrix->rows + vpos;
struct glyph_row *desired_row = desired_matrix->rows + vpos;
for (row = NULL;
row == NULL && vpos >= first_vpos;
--vpos, --current_row, --desired_row)
{
if (desired_row->enabled_p)
{
if (desired_row->displays_text_p)
row = desired_row;
}
else if (current_row->displays_text_p)
row = current_row;
}
xassert (row != NULL);
w->window_end_vpos = make_number (vpos + 1);
w->window_end_pos = make_number (Z - MATRIX_ROW_END_CHARPOS (row));
w->window_end_bytepos = Z_BYTE - MATRIX_ROW_END_BYTEPOS (row);
xassert (w->window_end_bytepos >= 0);
IF_DEBUG (debug_method_add (w, "C"));
}
else
abort ();
IF_DEBUG (debug_end_pos = XFASTINT (w->window_end_pos);
debug_end_vpos = XFASTINT (w->window_end_vpos));
/* Record that display has not been completed. */
w->window_end_valid = Qnil;
w->desired_matrix->no_scrolling_p = 1;
return 3;
#undef GIVE_UP
}
/***********************************************************************
More debugging support
***********************************************************************/
#if GLYPH_DEBUG
void dump_glyph_row P_ ((struct glyph_row *, int, int));
void dump_glyph_matrix P_ ((struct glyph_matrix *, int));
void dump_glyph P_ ((struct glyph_row *, struct glyph *, int));
/* Dump the contents of glyph matrix MATRIX on stderr.
GLYPHS 0 means don't show glyph contents.
GLYPHS 1 means show glyphs in short form
GLYPHS > 1 means show glyphs in long form. */
void
dump_glyph_matrix (matrix, glyphs)
struct glyph_matrix *matrix;
int glyphs;
{
int i;
for (i = 0; i < matrix->nrows; ++i)
dump_glyph_row (MATRIX_ROW (matrix, i), i, glyphs);
}
/* Dump contents of glyph GLYPH to stderr. ROW and AREA are
the glyph row and area where the glyph comes from. */
void
dump_glyph (row, glyph, area)
struct glyph_row *row;
struct glyph *glyph;
int area;
{
if (glyph->type == CHAR_GLYPH)
{
fprintf (stderr,
" %5d %4c %6d %c %3d 0x%05x %c %4d %1.1d%1.1d\n",
glyph - row->glyphs[TEXT_AREA],
'C',
glyph->charpos,
(BUFFERP (glyph->object)
? 'B'
: (STRINGP (glyph->object)
? 'S'
: '-')),
glyph->pixel_width,
glyph->u.ch,
(glyph->u.ch < 0x80 && glyph->u.ch >= ' '
? glyph->u.ch
: '.'),
glyph->face_id,
glyph->left_box_line_p,
glyph->right_box_line_p);
}
else if (glyph->type == STRETCH_GLYPH)
{
fprintf (stderr,
" %5d %4c %6d %c %3d 0x%05x %c %4d %1.1d%1.1d\n",
glyph - row->glyphs[TEXT_AREA],
'S',
glyph->charpos,
(BUFFERP (glyph->object)
? 'B'
: (STRINGP (glyph->object)
? 'S'
: '-')),
glyph->pixel_width,
0,
'.',
glyph->face_id,
glyph->left_box_line_p,
glyph->right_box_line_p);
}
else if (glyph->type == IMAGE_GLYPH)
{
fprintf (stderr,
" %5d %4c %6d %c %3d 0x%05x %c %4d %1.1d%1.1d\n",
glyph - row->glyphs[TEXT_AREA],
'I',
glyph->charpos,
(BUFFERP (glyph->object)
? 'B'
: (STRINGP (glyph->object)
? 'S'
: '-')),
glyph->pixel_width,
glyph->u.img_id,
'.',
glyph->face_id,
glyph->left_box_line_p,
glyph->right_box_line_p);
}
else if (glyph->type == COMPOSITE_GLYPH)
{
fprintf (stderr,
" %5d %4c %6d %c %3d 0x%05x",
glyph - row->glyphs[TEXT_AREA],
'+',
glyph->charpos,
(BUFFERP (glyph->object)
? 'B'
: (STRINGP (glyph->object)
? 'S'
: '-')),
glyph->pixel_width,
glyph->u.cmp.id);
if (glyph->u.cmp.automatic)
fprintf (stderr,
"[%d-%d]",
glyph->u.cmp.from, glyph->u.cmp.to);
fprintf (stderr, " . %4d %1.1d%1.1d\n",
glyph->face_id,
glyph->left_box_line_p,
glyph->right_box_line_p);
}
}
/* Dump the contents of glyph row at VPOS in MATRIX to stderr.
GLYPHS 0 means don't show glyph contents.
GLYPHS 1 means show glyphs in short form
GLYPHS > 1 means show glyphs in long form. */
void
dump_glyph_row (row, vpos, glyphs)
struct glyph_row *row;
int vpos, glyphs;
{
if (glyphs != 1)
{
fprintf (stderr, "Row Start End Used oE><\\CTZFesm X Y W H V A P\n");
fprintf (stderr, "======================================================================\n");
fprintf (stderr, "%3d %5d %5d %4d %1.1d%1.1d%1.1d%1.1d\
%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d %4d %4d %4d %4d %4d %4d %4d\n",
vpos,
MATRIX_ROW_START_CHARPOS (row),
MATRIX_ROW_END_CHARPOS (row),
row->used[TEXT_AREA],
row->contains_overlapping_glyphs_p,
row->enabled_p,
row->truncated_on_left_p,
row->truncated_on_right_p,
row->continued_p,
MATRIX_ROW_CONTINUATION_LINE_P (row),
row->displays_text_p,
row->ends_at_zv_p,
row->fill_line_p,
row->ends_in_middle_of_char_p,
row->starts_in_middle_of_char_p,
row->mouse_face_p,
row->x,
row->y,
row->pixel_width,
row->height,
row->visible_height,
row->ascent,
row->phys_ascent);
fprintf (stderr, "%9d %5d\t%5d\n", row->start.overlay_string_index,
row->end.overlay_string_index,
row->continuation_lines_width);
fprintf (stderr, "%9d %5d\n",
CHARPOS (row->start.string_pos),
CHARPOS (row->end.string_pos));
fprintf (stderr, "%9d %5d\n", row->start.dpvec_index,
row->end.dpvec_index);
}
if (glyphs > 1)
{
int area;
for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area)
{
struct glyph *glyph = row->glyphs[area];
struct glyph *glyph_end = glyph + row->used[area];
/* Glyph for a line end in text. */
if (area == TEXT_AREA && glyph == glyph_end && glyph->charpos > 0)
++glyph_end;
if (glyph < glyph_end)
fprintf (stderr, " Glyph Type Pos O W Code C Face LR\n");
for (; glyph < glyph_end; ++glyph)
dump_glyph (row, glyph, area);
}
}
else if (glyphs == 1)
{
int area;
for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area)
{
char *s = (char *) alloca (row->used[area] + 1);
int i;
for (i = 0; i < row->used[area]; ++i)
{
struct glyph *glyph = row->glyphs[area] + i;
if (glyph->type == CHAR_GLYPH
&& glyph->u.ch < 0x80
&& glyph->u.ch >= ' ')
s[i] = glyph->u.ch;
else
s[i] = '.';
}
s[i] = '\0';
fprintf (stderr, "%3d: (%d) '%s'\n", vpos, row->enabled_p, s);
}
}
}
DEFUN ("dump-glyph-matrix", Fdump_glyph_matrix,
Sdump_glyph_matrix, 0, 1, "p",
doc: /* Dump the current matrix of the selected window to stderr.
Shows contents of glyph row structures. With non-nil
parameter GLYPHS, dump glyphs as well. If GLYPHS is 1 show
glyphs in short form, otherwise show glyphs in long form. */)
(glyphs)
Lisp_Object glyphs;
{
struct window *w = XWINDOW (selected_window);
struct buffer *buffer = XBUFFER (w->buffer);
fprintf (stderr, "PT = %d, BEGV = %d. ZV = %d\n",
BUF_PT (buffer), BUF_BEGV (buffer), BUF_ZV (buffer));
fprintf (stderr, "Cursor x = %d, y = %d, hpos = %d, vpos = %d\n",
w->cursor.x, w->cursor.y, w->cursor.hpos, w->cursor.vpos);
fprintf (stderr, "=============================================\n");
dump_glyph_matrix (w->current_matrix,
NILP (glyphs) ? 0 : XINT (glyphs));
return Qnil;
}
DEFUN ("dump-frame-glyph-matrix", Fdump_frame_glyph_matrix,
Sdump_frame_glyph_matrix, 0, 0, "", doc: /* */)
()
{
struct frame *f = XFRAME (selected_frame);
dump_glyph_matrix (f->current_matrix, 1);
return Qnil;
}
DEFUN ("dump-glyph-row", Fdump_glyph_row, Sdump_glyph_row, 1, 2, "",
doc: /* Dump glyph row ROW to stderr.
GLYPH 0 means don't dump glyphs.
GLYPH 1 means dump glyphs in short form.
GLYPH > 1 or omitted means dump glyphs in long form. */)
(row, glyphs)
Lisp_Object row, glyphs;
{
struct glyph_matrix *matrix;
int vpos;
CHECK_NUMBER (row);
matrix = XWINDOW (selected_window)->current_matrix;
vpos = XINT (row);
if (vpos >= 0 && vpos < matrix->nrows)
dump_glyph_row (MATRIX_ROW (matrix, vpos),
vpos,
INTEGERP (glyphs) ? XINT (glyphs) : 2);
return Qnil;
}
DEFUN ("dump-tool-bar-row", Fdump_tool_bar_row, Sdump_tool_bar_row, 1, 2, "",
doc: /* Dump glyph row ROW of the tool-bar of the current frame to stderr.
GLYPH 0 means don't dump glyphs.
GLYPH 1 means dump glyphs in short form.
GLYPH > 1 or omitted means dump glyphs in long form. */)
(row, glyphs)
Lisp_Object row, glyphs;
{
struct frame *sf = SELECTED_FRAME ();
struct glyph_matrix *m = XWINDOW (sf->tool_bar_window)->current_matrix;
int vpos;
CHECK_NUMBER (row);
vpos = XINT (row);
if (vpos >= 0 && vpos < m->nrows)
dump_glyph_row (MATRIX_ROW (m, vpos), vpos,
INTEGERP (glyphs) ? XINT (glyphs) : 2);
return Qnil;
}
DEFUN ("trace-redisplay", Ftrace_redisplay, Strace_redisplay, 0, 1, "P",
doc: /* Toggle tracing of redisplay.
With ARG, turn tracing on if and only if ARG is positive. */)
(arg)
Lisp_Object arg;
{
if (NILP (arg))
trace_redisplay_p = !trace_redisplay_p;
else
{
arg = Fprefix_numeric_value (arg);
trace_redisplay_p = XINT (arg) > 0;
}
return Qnil;
}
DEFUN ("trace-to-stderr", Ftrace_to_stderr, Strace_to_stderr, 1, MANY, "",
doc: /* Like `format', but print result to stderr.
usage: (trace-to-stderr STRING &rest OBJECTS) */)
(nargs, args)
int nargs;
Lisp_Object *args;
{
Lisp_Object s = Fformat (nargs, args);
fprintf (stderr, "%s", SDATA (s));
return Qnil;
}
#endif /* GLYPH_DEBUG */
/***********************************************************************
Building Desired Matrix Rows
***********************************************************************/
/* Return a temporary glyph row holding the glyphs of an overlay arrow.
Used for non-window-redisplay windows, and for windows w/o left fringe. */
static struct glyph_row *
get_overlay_arrow_glyph_row (w, overlay_arrow_string)
struct window *w;
Lisp_Object overlay_arrow_string;
{
struct frame *f = XFRAME (WINDOW_FRAME (w));
struct buffer *buffer = XBUFFER (w->buffer);
struct buffer *old = current_buffer;
const unsigned char *arrow_string = SDATA (overlay_arrow_string);
int arrow_len = SCHARS (overlay_arrow_string);
const unsigned char *arrow_end = arrow_string + arrow_len;
const unsigned char *p;
struct it it;
int multibyte_p;
int n_glyphs_before;
set_buffer_temp (buffer);
init_iterator (&it, w, -1, -1, &scratch_glyph_row, DEFAULT_FACE_ID);
it.glyph_row->used[TEXT_AREA] = 0;
SET_TEXT_POS (it.position, 0, 0);
multibyte_p = !NILP (buffer->enable_multibyte_characters);
p = arrow_string;
while (p < arrow_end)
{
Lisp_Object face, ilisp;
/* Get the next character. */
if (multibyte_p)
it.c = string_char_and_length (p, &it.len);
else
it.c = *p, it.len = 1;
p += it.len;
/* Get its face. */
ilisp = make_number (p - arrow_string);
face = Fget_text_property (ilisp, Qface, overlay_arrow_string);
it.face_id = compute_char_face (f, it.c, face);
/* Compute its width, get its glyphs. */
n_glyphs_before = it.glyph_row->used[TEXT_AREA];
SET_TEXT_POS (it.position, -1, -1);
PRODUCE_GLYPHS (&it);
/* If this character doesn't fit any more in the line, we have
to remove some glyphs. */
if (it.current_x > it.last_visible_x)
{
it.glyph_row->used[TEXT_AREA] = n_glyphs_before;
break;
}
}
set_buffer_temp (old);
return it.glyph_row;
}
/* Insert truncation glyphs at the start of IT->glyph_row. Truncation
glyphs are only inserted for terminal frames since we can't really
win with truncation glyphs when partially visible glyphs are
involved. Which glyphs to insert is determined by
produce_special_glyphs. */
static void
insert_left_trunc_glyphs (it)
struct it *it;
{
struct it truncate_it;
struct glyph *from, *end, *to, *toend;
xassert (!FRAME_WINDOW_P (it->f));
/* Get the truncation glyphs. */
truncate_it = *it;
truncate_it.current_x = 0;
truncate_it.face_id = DEFAULT_FACE_ID;
truncate_it.glyph_row = &scratch_glyph_row;
truncate_it.glyph_row->used[TEXT_AREA] = 0;
CHARPOS (truncate_it.position) = BYTEPOS (truncate_it.position) = -1;
truncate_it.object = make_number (0);
produce_special_glyphs (&truncate_it, IT_TRUNCATION);
/* Overwrite glyphs from IT with truncation glyphs. */
from = truncate_it.glyph_row->glyphs[TEXT_AREA];
end = from + truncate_it.glyph_row->used[TEXT_AREA];
to = it->glyph_row->glyphs[TEXT_AREA];
toend = to + it->glyph_row->used[TEXT_AREA];
while (from < end)
*to++ = *from++;
/* There may be padding glyphs left over. Overwrite them too. */
while (to < toend && CHAR_GLYPH_PADDING_P (*to))
{
from = truncate_it.glyph_row->glyphs[TEXT_AREA];
while (from < end)
*to++ = *from++;
}
if (to > toend)
it->glyph_row->used[TEXT_AREA] = to - it->glyph_row->glyphs[TEXT_AREA];
}
/* Compute the pixel height and width of IT->glyph_row.
Most of the time, ascent and height of a display line will be equal
to the max_ascent and max_height values of the display iterator
structure. This is not the case if
1. We hit ZV without displaying anything. In this case, max_ascent
and max_height will be zero.
2. We have some glyphs that don't contribute to the line height.
(The glyph row flag contributes_to_line_height_p is for future
pixmap extensions).
The first case is easily covered by using default values because in
these cases, the line height does not really matter, except that it
must not be zero. */
static void
compute_line_metrics (it)
struct it *it;
{
struct glyph_row *row = it->glyph_row;
int area, i;
if (FRAME_WINDOW_P (it->f))
{
int i, min_y, max_y;
/* The line may consist of one space only, that was added to
place the cursor on it. If so, the row's height hasn't been
computed yet. */
if (row->height == 0)
{
if (it->max_ascent + it->max_descent == 0)
it->max_descent = it->max_phys_descent = FRAME_LINE_HEIGHT (it->f);
row->ascent = it->max_ascent;
row->height = it->max_ascent + it->max_descent;
row->phys_ascent = it->max_phys_ascent;
row->phys_height = it->max_phys_ascent + it->max_phys_descent;
row->extra_line_spacing = it->max_extra_line_spacing;
}
/* Compute the width of this line. */
row->pixel_width = row->x;
for (i = 0; i < row->used[TEXT_AREA]; ++i)
row->pixel_width += row->glyphs[TEXT_AREA][i].pixel_width;
xassert (row->pixel_width >= 0);
xassert (row->ascent >= 0 && row->height > 0);
row->overlapping_p = (MATRIX_ROW_OVERLAPS_SUCC_P (row)
|| MATRIX_ROW_OVERLAPS_PRED_P (row));
/* If first line's physical ascent is larger than its logical
ascent, use the physical ascent, and make the row taller.
This makes accented characters fully visible. */
if (row == MATRIX_FIRST_TEXT_ROW (it->w->desired_matrix)
&& row->phys_ascent > row->ascent)
{
row->height += row->phys_ascent - row->ascent;
row->ascent = row->phys_ascent;
}
/* Compute how much of the line is visible. */
row->visible_height = row->height;
min_y = WINDOW_HEADER_LINE_HEIGHT (it->w);
max_y = WINDOW_BOX_HEIGHT_NO_MODE_LINE (it->w);
if (row->y < min_y)
row->visible_height -= min_y - row->y;
if (row->y + row->height > max_y)
row->visible_height -= row->y + row->height - max_y;
}
else
{
row->pixel_width = row->used[TEXT_AREA];
if (row->continued_p)
row->pixel_width -= it->continuation_pixel_width;
else if (row->truncated_on_right_p)
row->pixel_width -= it->truncation_pixel_width;
row->ascent = row->phys_ascent = 0;
row->height = row->phys_height = row->visible_height = 1;
row->extra_line_spacing = 0;
}
/* Compute a hash code for this row. */
row->hash = 0;
for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area)
for (i = 0; i < row->used[area]; ++i)
row->hash = ((((row->hash << 4) + (row->hash >> 24)) & 0x0fffffff)
+ row->glyphs[area][i].u.val
+ row->glyphs[area][i].face_id
+ row->glyphs[area][i].padding_p
+ (row->glyphs[area][i].type << 2));
it->max_ascent = it->max_descent = 0;
it->max_phys_ascent = it->max_phys_descent = 0;
}
/* Append one space to the glyph row of iterator IT if doing a
window-based redisplay. The space has the same face as
IT->face_id. Value is non-zero if a space was added.
This function is called to make sure that there is always one glyph
at the end of a glyph row that the cursor can be set on under
window-systems. (If there weren't such a glyph we would not know
how wide and tall a box cursor should be displayed).
At the same time this space let's a nicely handle clearing to the
end of the line if the row ends in italic text. */
static int
append_space_for_newline (it, default_face_p)
struct it *it;
int default_face_p;
{
if (FRAME_WINDOW_P (it->f))
{
int n = it->glyph_row->used[TEXT_AREA];
if (it->glyph_row->glyphs[TEXT_AREA] + n
< it->glyph_row->glyphs[1 + TEXT_AREA])
{
/* Save some values that must not be changed.
Must save IT->c and IT->len because otherwise
ITERATOR_AT_END_P wouldn't work anymore after
append_space_for_newline has been called. */
enum display_element_type saved_what = it->what;
int saved_c = it->c, saved_len = it->len;
int saved_x = it->current_x;
int saved_face_id = it->face_id;
struct text_pos saved_pos;
Lisp_Object saved_object;
struct face *face;
saved_object = it->object;
saved_pos = it->position;
it->what = IT_CHARACTER;
bzero (&it->position, sizeof it->position);
it->object = make_number (0);
it->c = ' ';
it->len = 1;
if (default_face_p)
it->face_id = DEFAULT_FACE_ID;
else if (it->face_before_selective_p)
it->face_id = it->saved_face_id;
face = FACE_FROM_ID (it->f, it->face_id);
it->face_id = FACE_FOR_CHAR (it->f, face, 0, -1, Qnil);
PRODUCE_GLYPHS (it);
it->override_ascent = -1;
it->constrain_row_ascent_descent_p = 0;
it->current_x = saved_x;
it->object = saved_object;
it->position = saved_pos;
it->what = saved_what;
it->face_id = saved_face_id;
it->len = saved_len;
it->c = saved_c;
return 1;
}
}
return 0;
}
/* Extend the face of the last glyph in the text area of IT->glyph_row
to the end of the display line. Called from display_line.
If the glyph row is empty, add a space glyph to it so that we
know the face to draw. Set the glyph row flag fill_line_p. */
static void
extend_face_to_end_of_line (it)
struct it *it;
{
struct face *face;
struct frame *f = it->f;
/* If line is already filled, do nothing. */
if (it->current_x >= it->last_visible_x)
return;
/* Face extension extends the background and box of IT->face_id
to the end of the line. If the background equals the background
of the frame, we don't have to do anything. */
if (it->face_before_selective_p)
face = FACE_FROM_ID (it->f, it->saved_face_id);
else
face = FACE_FROM_ID (f, it->face_id);
if (FRAME_WINDOW_P (f)
&& it->glyph_row->displays_text_p
&& face->box == FACE_NO_BOX
&& face->background == FRAME_BACKGROUND_PIXEL (f)
&& !face->stipple)
return;
/* Set the glyph row flag indicating that the face of the last glyph
in the text area has to be drawn to the end of the text area. */
it->glyph_row->fill_line_p = 1;
/* If current character of IT is not ASCII, make sure we have the
ASCII face. This will be automatically undone the next time
get_next_display_element returns a multibyte character. Note
that the character will always be single byte in unibyte
text. */
if (!ASCII_CHAR_P (it->c))
{
it->face_id = FACE_FOR_CHAR (f, face, 0, -1, Qnil);
}
if (FRAME_WINDOW_P (f))
{
/* If the row is empty, add a space with the current face of IT,
so that we know which face to draw. */
if (it->glyph_row->used[TEXT_AREA] == 0)
{
it->glyph_row->glyphs[TEXT_AREA][0] = space_glyph;
it->glyph_row->glyphs[TEXT_AREA][0].face_id = it->face_id;
it->glyph_row->used[TEXT_AREA] = 1;
}
}
else
{
/* Save some values that must not be changed. */
int saved_x = it->current_x;
struct text_pos saved_pos;
Lisp_Object saved_object;
enum display_element_type saved_what = it->what;
int saved_face_id = it->face_id;
saved_object = it->object;
saved_pos = it->position;
it->what = IT_CHARACTER;
bzero (&it->position, sizeof it->position);
it->object = make_number (0);
it->c = ' ';
it->len = 1;
it->face_id = face->id;
PRODUCE_GLYPHS (it);
while (it->current_x <= it->last_visible_x)
PRODUCE_GLYPHS (it);
/* Don't count these blanks really. It would let us insert a left
truncation glyph below and make us set the cursor on them, maybe. */
it->current_x = saved_x;
it->object = saved_object;
it->position = saved_pos;
it->what = saved_what;
it->face_id = saved_face_id;
}
}
/* Value is non-zero if text starting at CHARPOS in current_buffer is
trailing whitespace. */
static int
trailing_whitespace_p (charpos)
int charpos;
{
int bytepos = CHAR_TO_BYTE (charpos);
int c = 0;
while (bytepos < ZV_BYTE
&& (c = FETCH_CHAR (bytepos),
c == ' ' || c == '\t'))
++bytepos;
if (bytepos >= ZV_BYTE || c == '\n' || c == '\r')
{
if (bytepos != PT_BYTE)
return 1;
}
return 0;
}
/* Highlight trailing whitespace, if any, in ROW. */
void
highlight_trailing_whitespace (f, row)
struct frame *f;
struct glyph_row *row;
{
int used = row->used[TEXT_AREA];
if (used)
{
struct glyph *start = row->glyphs[TEXT_AREA];
struct glyph *glyph = start + used - 1;
/* Skip over glyphs inserted to display the cursor at the
end of a line, for extending the face of the last glyph
to the end of the line on terminals, and for truncation
and continuation glyphs. */
while (glyph >= start
&& glyph->type == CHAR_GLYPH
&& INTEGERP (glyph->object))
--glyph;
/* If last glyph is a space or stretch, and it's trailing
whitespace, set the face of all trailing whitespace glyphs in
IT->glyph_row to `trailing-whitespace'. */
if (glyph >= start
&& BUFFERP (glyph->object)
&& (glyph->type == STRETCH_GLYPH
|| (glyph->type == CHAR_GLYPH
&& glyph->u.ch == ' '))
&& trailing_whitespace_p (glyph->charpos))
{
int face_id = lookup_named_face (f, Qtrailing_whitespace, 0);
if (face_id < 0)
return;
while (glyph >= start
&& BUFFERP (glyph->object)
&& (glyph->type == STRETCH_GLYPH
|| (glyph->type == CHAR_GLYPH
&& glyph->u.ch == ' ')))
(glyph--)->face_id = face_id;
}
}
}
/* Value is non-zero if glyph row ROW in window W should be
used to hold the cursor. */
static int
cursor_row_p (w, row)
struct window *w;
struct glyph_row *row;
{
int cursor_row_p = 1;
if (PT == MATRIX_ROW_END_CHARPOS (row))
{
/* Suppose the row ends on a string.
Unless the row is continued, that means it ends on a newline
in the string. If it's anything other than a display string
(e.g. a before-string from an overlay), we don't want the
cursor there. (This heuristic seems to give the optimal
behavior for the various types of multi-line strings.) */
if (CHARPOS (row->end.string_pos) >= 0)
{
if (row->continued_p)
cursor_row_p = 1;
else
{
/* Check for `display' property. */
struct glyph *beg = row->glyphs[TEXT_AREA];
struct glyph *end = beg + row->used[TEXT_AREA] - 1;
struct glyph *glyph;
cursor_row_p = 0;
for (glyph = end; glyph >= beg; --glyph)
if (STRINGP (glyph->object))
{
Lisp_Object prop
= Fget_char_property (make_number (PT),
Qdisplay, Qnil);
cursor_row_p =
(!NILP (prop)
&& display_prop_string_p (prop, glyph->object));
break;
}
}
}
else if (MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row))
{
/* If the row ends in middle of a real character,
and the line is continued, we want the cursor here.
That's because MATRIX_ROW_END_CHARPOS would equal
PT if PT is before the character. */
if (!row->ends_in_ellipsis_p)
cursor_row_p = row->continued_p;
else
/* If the row ends in an ellipsis, then
MATRIX_ROW_END_CHARPOS will equal point after the invisible text.
We want that position to be displayed after the ellipsis. */
cursor_row_p = 0;
}
/* If the row ends at ZV, display the cursor at the end of that
row instead of at the start of the row below. */
else if (row->ends_at_zv_p)
cursor_row_p = 1;
else
cursor_row_p = 0;
}
return cursor_row_p;
}
/* Push the display property PROP so that it will be rendered at the
current position in IT. Return 1 if PROP was successfully pushed,
0 otherwise. */
static int
push_display_prop (struct it *it, Lisp_Object prop)
{
push_it (it);
if (STRINGP (prop))
{
if (SCHARS (prop) == 0)
{
pop_it (it);
return 0;
}
it->string = prop;
it->multibyte_p = STRING_MULTIBYTE (it->string);
it->current.overlay_string_index = -1;
IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = 0;
it->end_charpos = it->string_nchars = SCHARS (it->string);
it->method = GET_FROM_STRING;
it->stop_charpos = 0;
}
else if (CONSP (prop) && EQ (XCAR (prop), Qspace))
{
it->method = GET_FROM_STRETCH;
it->object = prop;
}
#ifdef HAVE_WINDOW_SYSTEM
else if (IMAGEP (prop))
{
it->what = IT_IMAGE;
it->image_id = lookup_image (it->f, prop);
it->method = GET_FROM_IMAGE;
}
#endif /* HAVE_WINDOW_SYSTEM */
else
{
pop_it (it); /* bogus display property, give up */
return 0;
}
return 1;
}
/* Return the character-property PROP at the current position in IT. */
static Lisp_Object
get_it_property (it, prop)
struct it *it;
Lisp_Object prop;
{
Lisp_Object position;
if (STRINGP (it->object))
position = make_number (IT_STRING_CHARPOS (*it));
else if (BUFFERP (it->object))
position = make_number (IT_CHARPOS (*it));
else
return Qnil;
return Fget_char_property (position, prop, it->object);
}
/* See if there's a line- or wrap-prefix, and if so, push it on IT. */
static void
handle_line_prefix (struct it *it)
{
Lisp_Object prefix;
if (it->continuation_lines_width > 0)
{
prefix = get_it_property (it, Qwrap_prefix);
if (NILP (prefix))
prefix = Vwrap_prefix;
}
else
{
prefix = get_it_property (it, Qline_prefix);
if (NILP (prefix))
prefix = Vline_prefix;
}
if (! NILP (prefix) && push_display_prop (it, prefix))
{
/* If the prefix is wider than the window, and we try to wrap
it, it would acquire its own wrap prefix, and so on till the
iterator stack overflows. So, don't wrap the prefix. */
it->line_wrap = TRUNCATE;
it->avoid_cursor_p = 1;
}
}
/* Construct the glyph row IT->glyph_row in the desired matrix of
IT->w from text at the current position of IT. See dispextern.h
for an overview of struct it. Value is non-zero if
IT->glyph_row displays text, as opposed to a line displaying ZV
only. */
static int
display_line (it)
struct it *it;
{
struct glyph_row *row = it->glyph_row;
Lisp_Object overlay_arrow_string;
struct it wrap_it;
int may_wrap = 0, wrap_x;
int wrap_row_used = -1, wrap_row_ascent, wrap_row_height;
int wrap_row_phys_ascent, wrap_row_phys_height;
int wrap_row_extra_line_spacing;
/* We always start displaying at hpos zero even if hscrolled. */
xassert (it->hpos == 0 && it->current_x == 0);
if (MATRIX_ROW_VPOS (row, it->w->desired_matrix)
>= it->w->desired_matrix->nrows)
{
it->w->nrows_scale_factor++;
fonts_changed_p = 1;
return 0;
}
/* Is IT->w showing the region? */
it->w->region_showing = it->region_beg_charpos > 0 ? Qt : Qnil;
/* Clear the result glyph row and enable it. */
prepare_desired_row (row);
row->y = it->current_y;
row->start = it->start;
row->continuation_lines_width = it->continuation_lines_width;
row->displays_text_p = 1;
row->starts_in_middle_of_char_p = it->starts_in_middle_of_char_p;
it->starts_in_middle_of_char_p = 0;
/* Arrange the overlays nicely for our purposes. Usually, we call
display_line on only one line at a time, in which case this
can't really hurt too much, or we call it on lines which appear
one after another in the buffer, in which case all calls to
recenter_overlay_lists but the first will be pretty cheap. */
recenter_overlay_lists (current_buffer, IT_CHARPOS (*it));
/* Move over display elements that are not visible because we are
hscrolled. This may stop at an x-position < IT->first_visible_x
if the first glyph is partially visible or if we hit a line end. */
if (it->current_x < it->first_visible_x)
{
move_it_in_display_line_to (it, ZV, it->first_visible_x,
MOVE_TO_POS | MOVE_TO_X);
}
else
{
/* We only do this when not calling `move_it_in_display_line_to'
above, because move_it_in_display_line_to calls
handle_line_prefix itself. */
handle_line_prefix (it);
}
/* Get the initial row height. This is either the height of the
text hscrolled, if there is any, or zero. */
row->ascent = it->max_ascent;
row->height = it->max_ascent + it->max_descent;
row->phys_ascent = it->max_phys_ascent;
row->phys_height = it->max_phys_ascent + it->max_phys_descent;
row->extra_line_spacing = it->max_extra_line_spacing;
/* Loop generating characters. The loop is left with IT on the next
character to display. */
while (1)
{
int n_glyphs_before, hpos_before, x_before;
int x, i, nglyphs;
int ascent = 0, descent = 0, phys_ascent = 0, phys_descent = 0;
/* Retrieve the next thing to display. Value is zero if end of
buffer reached. */
if (!get_next_display_element (it))
{
/* Maybe add a space at the end of this line that is used to
display the cursor there under X. Set the charpos of the
first glyph of blank lines not corresponding to any text
to -1. */
if (IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
row->exact_window_width_line_p = 1;
else if ((append_space_for_newline (it, 1) && row->used[TEXT_AREA] == 1)
|| row->used[TEXT_AREA] == 0)
{
row->glyphs[TEXT_AREA]->charpos = -1;
row->displays_text_p = 0;
if (!NILP (XBUFFER (it->w->buffer)->indicate_empty_lines)
&& (!MINI_WINDOW_P (it->w)
|| (minibuf_level && EQ (it->window, minibuf_window))))
row->indicate_empty_line_p = 1;
}
it->continuation_lines_width = 0;
row->ends_at_zv_p = 1;
break;
}
/* Now, get the metrics of what we want to display. This also
generates glyphs in `row' (which is IT->glyph_row). */
n_glyphs_before = row->used[TEXT_AREA];
x = it->current_x;
/* Remember the line height so far in case the next element doesn't
fit on the line. */
if (it->line_wrap != TRUNCATE)
{
ascent = it->max_ascent;
descent = it->max_descent;
phys_ascent = it->max_phys_ascent;
phys_descent = it->max_phys_descent;
if (it->line_wrap == WORD_WRAP && it->area == TEXT_AREA)
{
if (IT_DISPLAYING_WHITESPACE (it))
may_wrap = 1;
else if (may_wrap)
{
wrap_it = *it;
wrap_x = x;
wrap_row_used = row->used[TEXT_AREA];
wrap_row_ascent = row->ascent;
wrap_row_height = row->height;
wrap_row_phys_ascent = row->phys_ascent;
wrap_row_phys_height = row->phys_height;
wrap_row_extra_line_spacing = row->extra_line_spacing;
may_wrap = 0;
}
}
}
PRODUCE_GLYPHS (it);
/* If this display element was in marginal areas, continue with
the next one. */
if (it->area != TEXT_AREA)
{
row->ascent = max (row->ascent, it->max_ascent);
row->height = max (row->height, it->max_ascent + it->max_descent);
row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent);
row->phys_height = max (row->phys_height,
it->max_phys_ascent + it->max_phys_descent);
row->extra_line_spacing = max (row->extra_line_spacing,
it->max_extra_line_spacing);
set_iterator_to_next (it, 1);
continue;
}
/* Does the display element fit on the line? If we truncate
lines, we should draw past the right edge of the window. If
we don't truncate, we want to stop so that we can display the
continuation glyph before the right margin. If lines are
continued, there are two possible strategies for characters
resulting in more than 1 glyph (e.g. tabs): Display as many
glyphs as possible in this line and leave the rest for the
continuation line, or display the whole element in the next
line. Original redisplay did the former, so we do it also. */
nglyphs = row->used[TEXT_AREA] - n_glyphs_before;
hpos_before = it->hpos;
x_before = x;
if (/* Not a newline. */
nglyphs > 0
/* Glyphs produced fit entirely in the line. */
&& it->current_x < it->last_visible_x)
{
it->hpos += nglyphs;
row->ascent = max (row->ascent, it->max_ascent);
row->height = max (row->height, it->max_ascent + it->max_descent);
row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent);
row->phys_height = max (row->phys_height,
it->max_phys_ascent + it->max_phys_descent);
row->extra_line_spacing = max (row->extra_line_spacing,
it->max_extra_line_spacing);
if (it->current_x - it->pixel_width < it->first_visible_x)
row->x = x - it->first_visible_x;
}
else
{
int new_x;
struct glyph *glyph;
for (i = 0; i < nglyphs; ++i, x = new_x)
{
glyph = row->glyphs[TEXT_AREA] + n_glyphs_before + i;
new_x = x + glyph->pixel_width;
if (/* Lines are continued. */
it->line_wrap != TRUNCATE
&& (/* Glyph doesn't fit on the line. */
new_x > it->last_visible_x
/* Or it fits exactly on a window system frame. */
|| (new_x == it->last_visible_x
&& FRAME_WINDOW_P (it->f))))
{
/* End of a continued line. */
if (it->hpos == 0
|| (new_x == it->last_visible_x
&& FRAME_WINDOW_P (it->f)))
{
/* Current glyph is the only one on the line or
fits exactly on the line. We must continue
the line because we can't draw the cursor
after the glyph. */
row->continued_p = 1;
it->current_x = new_x;
it->continuation_lines_width += new_x;
++it->hpos;
if (i == nglyphs - 1)
{
/* If line-wrap is on, check if a previous
wrap point was found. */
if (wrap_row_used > 0
/* Even if there is a previous wrap
point, continue the line here as
usual, if (i) the previous character
was a space or tab AND (ii) the
current character is not. */
&& (!may_wrap
|| IT_DISPLAYING_WHITESPACE (it)))
goto back_to_wrap;
set_iterator_to_next (it, 1);
if (IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
{
if (!get_next_display_element (it))
{
row->exact_window_width_line_p = 1;
it->continuation_lines_width = 0;
row->continued_p = 0;
row->ends_at_zv_p = 1;
}
else if (ITERATOR_AT_END_OF_LINE_P (it))
{
row->continued_p = 0;
row->exact_window_width_line_p = 1;
}
}
}
}
else if (CHAR_GLYPH_PADDING_P (*glyph)
&& !FRAME_WINDOW_P (it->f))
{
/* A padding glyph that doesn't fit on this line.
This means the whole character doesn't fit
on the line. */
row->used[TEXT_AREA] = n_glyphs_before;
/* Fill the rest of the row with continuation
glyphs like in 20.x. */
while (row->glyphs[TEXT_AREA] + row->used[TEXT_AREA]
< row->glyphs[1 + TEXT_AREA])
produce_special_glyphs (it, IT_CONTINUATION);
row->continued_p = 1;
it->current_x = x_before;
it->continuation_lines_width += x_before;
/* Restore the height to what it was before the
element not fitting on the line. */
it->max_ascent = ascent;
it->max_descent = descent;
it->max_phys_ascent = phys_ascent;
it->max_phys_descent = phys_descent;
}
else if (wrap_row_used > 0)
{
back_to_wrap:
*it = wrap_it;
it->continuation_lines_width += wrap_x;
row->used[TEXT_AREA] = wrap_row_used;
row->ascent = wrap_row_ascent;
row->height = wrap_row_height;
row->phys_ascent = wrap_row_phys_ascent;
row->phys_height = wrap_row_phys_height;
row->extra_line_spacing = wrap_row_extra_line_spacing;
row->continued_p = 1;
row->ends_at_zv_p = 0;
row->exact_window_width_line_p = 0;
it->continuation_lines_width += x;
/* Make sure that a non-default face is extended
up to the right margin of the window. */
extend_face_to_end_of_line (it);
}
else if (it->c == '\t' && FRAME_WINDOW_P (it->f))
{
/* A TAB that extends past the right edge of the
window. This produces a single glyph on
window system frames. We leave the glyph in
this row and let it fill the row, but don't
consume the TAB. */
it->continuation_lines_width += it->last_visible_x;
row->ends_in_middle_of_char_p = 1;
row->continued_p = 1;
glyph->pixel_width = it->last_visible_x - x;
it->starts_in_middle_of_char_p = 1;
}
else
{
/* Something other than a TAB that draws past
the right edge of the window. Restore
positions to values before the element. */
row->used[TEXT_AREA] = n_glyphs_before + i;
/* Display continuation glyphs. */
if (!FRAME_WINDOW_P (it->f))
produce_special_glyphs (it, IT_CONTINUATION);
row->continued_p = 1;
it->current_x = x_before;
it->continuation_lines_width += x;
extend_face_to_end_of_line (it);
if (nglyphs > 1 && i > 0)
{
row->ends_in_middle_of_char_p = 1;
it->starts_in_middle_of_char_p = 1;
}
/* Restore the height to what it was before the
element not fitting on the line. */
it->max_ascent = ascent;
it->max_descent = descent;
it->max_phys_ascent = phys_ascent;
it->max_phys_descent = phys_descent;
}
break;
}
else if (new_x > it->first_visible_x)
{
/* Increment number of glyphs actually displayed. */
++it->hpos;
if (x < it->first_visible_x)
/* Glyph is partially visible, i.e. row starts at
negative X position. */
row->x = x - it->first_visible_x;
}
else
{
/* Glyph is completely off the left margin of the
window. This should not happen because of the
move_it_in_display_line at the start of this
function, unless the text display area of the
window is empty. */
xassert (it->first_visible_x <= it->last_visible_x);
}
}
row->ascent = max (row->ascent, it->max_ascent);
row->height = max (row->height, it->max_ascent + it->max_descent);
row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent);
row->phys_height = max (row->phys_height,
it->max_phys_ascent + it->max_phys_descent);
row->extra_line_spacing = max (row->extra_line_spacing,
it->max_extra_line_spacing);
/* End of this display line if row is continued. */
if (row->continued_p || row->ends_at_zv_p)
break;
}
at_end_of_line:
/* Is this a line end? If yes, we're also done, after making
sure that a non-default face is extended up to the right
margin of the window. */
if (ITERATOR_AT_END_OF_LINE_P (it))
{
int used_before = row->used[TEXT_AREA];
row->ends_in_newline_from_string_p = STRINGP (it->object);
/* Add a space at the end of the line that is used to
display the cursor there. */
if (!IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
append_space_for_newline (it, 0);
/* Extend the face to the end of the line. */
extend_face_to_end_of_line (it);
/* Make sure we have the position. */
if (used_before == 0)
row->glyphs[TEXT_AREA]->charpos = CHARPOS (it->position);
/* Consume the line end. This skips over invisible lines. */
set_iterator_to_next (it, 1);
it->continuation_lines_width = 0;
break;
}
/* Proceed with next display element. Note that this skips
over lines invisible because of selective display. */
set_iterator_to_next (it, 1);
/* If we truncate lines, we are done when the last displayed
glyphs reach past the right margin of the window. */
if (it->line_wrap == TRUNCATE
&& (FRAME_WINDOW_P (it->f)
? (it->current_x >= it->last_visible_x)
: (it->current_x > it->last_visible_x)))
{
/* Maybe add truncation glyphs. */
if (!FRAME_WINDOW_P (it->f))
{
int i, n;
for (i = row->used[TEXT_AREA] - 1; i > 0; --i)
if (!CHAR_GLYPH_PADDING_P (row->glyphs[TEXT_AREA][i]))
break;
for (n = row->used[TEXT_AREA]; i < n; ++i)
{
row->used[TEXT_AREA] = i;
produce_special_glyphs (it, IT_TRUNCATION);
}
}
else if (IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
{
/* Don't truncate if we can overflow newline into fringe. */
if (!get_next_display_element (it))
{
it->continuation_lines_width = 0;
row->ends_at_zv_p = 1;
row->exact_window_width_line_p = 1;
break;
}
if (ITERATOR_AT_END_OF_LINE_P (it))
{
row->exact_window_width_line_p = 1;
goto at_end_of_line;
}
}
row->truncated_on_right_p = 1;
it->continuation_lines_width = 0;
reseat_at_next_visible_line_start (it, 0);
row->ends_at_zv_p = FETCH_BYTE (IT_BYTEPOS (*it) - 1) != '\n';
it->hpos = hpos_before;
it->current_x = x_before;
break;
}
}
/* If line is not empty and hscrolled, maybe insert truncation glyphs
at the left window margin. */
if (it->first_visible_x
&& IT_CHARPOS (*it) != MATRIX_ROW_START_CHARPOS (row))
{
if (!FRAME_WINDOW_P (it->f))
insert_left_trunc_glyphs (it);
row->truncated_on_left_p = 1;
}
/* If the start of this line is the overlay arrow-position, then
mark this glyph row as the one containing the overlay arrow.
This is clearly a mess with variable size fonts. It would be
better to let it be displayed like cursors under X. */
if ((row->displays_text_p || !overlay_arrow_seen)
&& (overlay_arrow_string = overlay_arrow_at_row (it, row),
!NILP (overlay_arrow_string)))
{
/* Overlay arrow in window redisplay is a fringe bitmap. */
if (STRINGP (overlay_arrow_string))
{
struct glyph_row *arrow_row
= get_overlay_arrow_glyph_row (it->w, overlay_arrow_string);
struct glyph *glyph = arrow_row->glyphs[TEXT_AREA];
struct glyph *arrow_end = glyph + arrow_row->used[TEXT_AREA];
struct glyph *p = row->glyphs[TEXT_AREA];
struct glyph *p2, *end;
/* Copy the arrow glyphs. */
while (glyph < arrow_end)
*p++ = *glyph++;
/* Throw away padding glyphs. */
p2 = p;
end = row->glyphs[TEXT_AREA] + row->used[TEXT_AREA];
while (p2 < end && CHAR_GLYPH_PADDING_P (*p2))
++p2;
if (p2 > p)
{
while (p2 < end)
*p++ = *p2++;
row->used[TEXT_AREA] = p2 - row->glyphs[TEXT_AREA];
}
}
else
{
xassert (INTEGERP (overlay_arrow_string));
row->overlay_arrow_bitmap = XINT (overlay_arrow_string);
}
overlay_arrow_seen = 1;
}
/* Compute pixel dimensions of this line. */
compute_line_metrics (it);
/* Remember the position at which this line ends. */
row->end = it->current;
/* Record whether this row ends inside an ellipsis. */
row->ends_in_ellipsis_p
= (it->method == GET_FROM_DISPLAY_VECTOR
&& it->ellipsis_p);
/* Save fringe bitmaps in this row. */
row->left_user_fringe_bitmap = it->left_user_fringe_bitmap;
row->left_user_fringe_face_id = it->left_user_fringe_face_id;
row->right_user_fringe_bitmap = it->right_user_fringe_bitmap;
row->right_user_fringe_face_id = it->right_user_fringe_face_id;
it->left_user_fringe_bitmap = 0;
it->left_user_fringe_face_id = 0;
it->right_user_fringe_bitmap = 0;
it->right_user_fringe_face_id = 0;
/* Maybe set the cursor. */
if (it->w->cursor.vpos < 0
&& PT >= MATRIX_ROW_START_CHARPOS (row)
&& PT <= MATRIX_ROW_END_CHARPOS (row)
&& cursor_row_p (it->w, row))
set_cursor_from_row (it->w, row, it->w->desired_matrix, 0, 0, 0, 0);
/* Highlight trailing whitespace. */
if (!NILP (Vshow_trailing_whitespace))
highlight_trailing_whitespace (it->f, it->glyph_row);
/* Prepare for the next line. This line starts horizontally at (X
HPOS) = (0 0). Vertical positions are incremented. As a
convenience for the caller, IT->glyph_row is set to the next
row to be used. */
it->current_x = it->hpos = 0;
it->current_y += row->height;
++it->vpos;
++it->glyph_row;
it->start = it->current;
return row->displays_text_p;
}
/***********************************************************************
Menu Bar
***********************************************************************/
/* Redisplay the menu bar in the frame for window W.
The menu bar of X frames that don't have X toolkit support is
displayed in a special window W->frame->menu_bar_window.
The menu bar of terminal frames is treated specially as far as
glyph matrices are concerned. Menu bar lines are not part of
windows, so the update is done directly on the frame matrix rows
for the menu bar. */
static void
display_menu_bar (w)
struct window *w;
{
struct frame *f = XFRAME (WINDOW_FRAME (w));
struct it it;
Lisp_Object items;
int i;
/* Don't do all this for graphical frames. */
#ifdef HAVE_NTGUI
if (FRAME_W32_P (f))
return;
#endif
#if defined (USE_X_TOOLKIT) || defined (USE_GTK)
if (FRAME_X_P (f))
return;
#endif
#ifdef HAVE_NS
if (FRAME_NS_P (f))
return;
#endif /* HAVE_NS */
#ifdef USE_X_TOOLKIT
xassert (!FRAME_WINDOW_P (f));
init_iterator (&it, w, -1, -1, f->desired_matrix->rows, MENU_FACE_ID);
it.first_visible_x = 0;
it.last_visible_x = FRAME_TOTAL_COLS (f) * FRAME_COLUMN_WIDTH (f);
#else /* not USE_X_TOOLKIT */
if (FRAME_WINDOW_P (f))
{
/* Menu bar lines are displayed in the desired matrix of the
dummy window menu_bar_window. */
struct window *menu_w;
xassert (WINDOWP (f->menu_bar_window));
menu_w = XWINDOW (f->menu_bar_window);
init_iterator (&it, menu_w, -1, -1, menu_w->desired_matrix->rows,
MENU_FACE_ID);
it.first_visible_x = 0;
it.last_visible_x = FRAME_TOTAL_COLS (f) * FRAME_COLUMN_WIDTH (f);
}
else
{
/* This is a TTY frame, i.e. character hpos/vpos are used as
pixel x/y. */
init_iterator (&it, w, -1, -1, f->desired_matrix->rows,
MENU_FACE_ID);
it.first_visible_x = 0;
it.last_visible_x = FRAME_COLS (f);
}
#endif /* not USE_X_TOOLKIT */
if (! mode_line_inverse_video)
/* Force the menu-bar to be displayed in the default face. */
it.base_face_id = it.face_id = DEFAULT_FACE_ID;
/* Clear all rows of the menu bar. */
for (i = 0; i < FRAME_MENU_BAR_LINES (f); ++i)
{
struct glyph_row *row = it.glyph_row + i;
clear_glyph_row (row);
row->enabled_p = 1;
row->full_width_p = 1;
}
/* Display all items of the menu bar. */
items = FRAME_MENU_BAR_ITEMS (it.f);
for (i = 0; i < XVECTOR (items)->size; i += 4)
{
Lisp_Object string;
/* Stop at nil string. */
string = AREF (items, i + 1);
if (NILP (string))
break;
/* Remember where item was displayed. */
ASET (items, i + 3, make_number (it.hpos));
/* Display the item, pad with one space. */
if (it.current_x < it.last_visible_x)
display_string (NULL, string, Qnil, 0, 0, &it,
SCHARS (string) + 1, 0, 0, -1);
}
/* Fill out the line with spaces. */
if (it.current_x < it.last_visible_x)
display_string ("", Qnil, Qnil, 0, 0, &it, -1, 0, 0, -1);
/* Compute the total height of the lines. */
compute_line_metrics (&it);
}
/***********************************************************************
Mode Line
***********************************************************************/
/* Redisplay mode lines in the window tree whose root is WINDOW. If
FORCE is non-zero, redisplay mode lines unconditionally.
Otherwise, redisplay only mode lines that are garbaged. Value is
the number of windows whose mode lines were redisplayed. */
static int
redisplay_mode_lines (window, force)
Lisp_Object window;
int force;
{
int nwindows = 0;
while (!NILP (window))
{
struct window *w = XWINDOW (window);
if (WINDOWP (w->hchild))
nwindows += redisplay_mode_lines (w->hchild, force);
else if (WINDOWP (w->vchild))
nwindows += redisplay_mode_lines (w->vchild, force);
else if (force
|| FRAME_GARBAGED_P (XFRAME (w->frame))
|| !MATRIX_MODE_LINE_ROW (w->current_matrix)->enabled_p)
{
struct text_pos lpoint;
struct buffer *old = current_buffer;
/* Set the window's buffer for the mode line display. */
SET_TEXT_POS (lpoint, PT, PT_BYTE);
set_buffer_internal_1 (XBUFFER (w->buffer));
/* Point refers normally to the selected window. For any
other window, set up appropriate value. */
if (!EQ (window, selected_window))
{
struct text_pos pt;
SET_TEXT_POS_FROM_MARKER (pt, w->pointm);
if (CHARPOS (pt) < BEGV)
TEMP_SET_PT_BOTH (BEGV, BEGV_BYTE);
else if (CHARPOS (pt) > (ZV - 1))
TEMP_SET_PT_BOTH (ZV, ZV_BYTE);
else
TEMP_SET_PT_BOTH (CHARPOS (pt), BYTEPOS (pt));
}
/* Display mode lines. */
clear_glyph_matrix (w->desired_matrix);
if (display_mode_lines (w))
{
++nwindows;
w->must_be_updated_p = 1;
}
/* Restore old settings. */
set_buffer_internal_1 (old);
TEMP_SET_PT_BOTH (CHARPOS (lpoint), BYTEPOS (lpoint));
}
window = w->next;
}
return nwindows;
}
/* Display the mode and/or header line of window W. Value is the
sum number of mode lines and header lines displayed. */
static int
display_mode_lines (w)
struct window *w;
{
Lisp_Object old_selected_window, old_selected_frame;
int n = 0;
old_selected_frame = selected_frame;
selected_frame = w->frame;
old_selected_window = selected_window;
XSETWINDOW (selected_window, w);
/* These will be set while the mode line specs are processed. */
line_number_displayed = 0;
w->column_number_displayed = Qnil;
if (WINDOW_WANTS_MODELINE_P (w))
{
struct window *sel_w = XWINDOW (old_selected_window);
/* Select mode line face based on the real selected window. */
display_mode_line (w, CURRENT_MODE_LINE_FACE_ID_3 (sel_w, sel_w, w),
current_buffer->mode_line_format);
++n;
}
if (WINDOW_WANTS_HEADER_LINE_P (w))
{
display_mode_line (w, HEADER_LINE_FACE_ID,
current_buffer->header_line_format);
++n;
}
selected_frame = old_selected_frame;
selected_window = old_selected_window;
return n;
}
/* Display mode or header line of window W. FACE_ID specifies which
line to display; it is either MODE_LINE_FACE_ID or
HEADER_LINE_FACE_ID. FORMAT is the mode/header line format to
display. Value is the pixel height of the mode/header line
displayed. */
static int
display_mode_line (w, face_id, format)
struct window *w;
enum face_id face_id;
Lisp_Object format;
{
struct it it;
struct face *face;
int count = SPECPDL_INDEX ();
init_iterator (&it, w, -1, -1, NULL, face_id);
/* Don't extend on a previously drawn mode-line.
This may happen if called from pos_visible_p. */
it.glyph_row->enabled_p = 0;
prepare_desired_row (it.glyph_row);
it.glyph_row->mode_line_p = 1;
if (! mode_line_inverse_video)
/* Force the mode-line to be displayed in the default face. */
it.base_face_id = it.face_id = DEFAULT_FACE_ID;
record_unwind_protect (unwind_format_mode_line,
format_mode_line_unwind_data (NULL, Qnil, 0));
mode_line_target = MODE_LINE_DISPLAY;
/* Temporarily make frame's keyboard the current kboard so that
kboard-local variables in the mode_line_format will get the right
values. */
push_kboard (FRAME_KBOARD (it.f));
record_unwind_save_match_data ();
display_mode_element (&it, 0, 0, 0, format, Qnil, 0);
pop_kboard ();
unbind_to (count, Qnil);
/* Fill up with spaces. */
display_string (" ", Qnil, Qnil, 0, 0, &it, 10000, -1, -1, 0);
compute_line_metrics (&it);
it.glyph_row->full_width_p = 1;
it.glyph_row->continued_p = 0;
it.glyph_row->truncated_on_left_p = 0;
it.glyph_row->truncated_on_right_p = 0;
/* Make a 3D mode-line have a shadow at its right end. */
face = FACE_FROM_ID (it.f, face_id);
extend_face_to_end_of_line (&it);
if (face->box != FACE_NO_BOX)
{
struct glyph *last = (it.glyph_row->glyphs[TEXT_AREA]
+ it.glyph_row->used[TEXT_AREA] - 1);
last->right_box_line_p = 1;
}
return it.glyph_row->height;
}
/* Move element ELT in LIST to the front of LIST.
Return the updated list. */
static Lisp_Object
move_elt_to_front (elt, list)
Lisp_Object elt, list;
{
register Lisp_Object tail, prev;
register Lisp_Object tem;
tail = list;
prev = Qnil;
while (CONSP (tail))
{
tem = XCAR (tail);
if (EQ (elt, tem))
{
/* Splice out the link TAIL. */
if (NILP (prev))
list = XCDR (tail);
else
Fsetcdr (prev, XCDR (tail));
/* Now make it the first. */
Fsetcdr (tail, list);
return tail;
}
else
prev = tail;
tail = XCDR (tail);
QUIT;
}
/* Not found--return unchanged LIST. */
return list;
}
/* Contribute ELT to the mode line for window IT->w. How it
translates into text depends on its data type.
IT describes the display environment in which we display, as usual.
DEPTH is the depth in recursion. It is used to prevent
infinite recursion here.
FIELD_WIDTH is the number of characters the display of ELT should
occupy in the mode line, and PRECISION is the maximum number of
characters to display from ELT's representation. See
display_string for details.
Returns the hpos of the end of the text generated by ELT.
PROPS is a property list to add to any string we encounter.
If RISKY is nonzero, remove (disregard) any properties in any string
we encounter, and ignore :eval and :propertize.
The global variable `mode_line_target' determines whether the
output is passed to `store_mode_line_noprop',
`store_mode_line_string', or `display_string'. */
static int
display_mode_element (it, depth, field_width, precision, elt, props, risky)
struct it *it;
int depth;
int field_width, precision;
Lisp_Object elt, props;
int risky;
{
int n = 0, field, prec;
int literal = 0;
tail_recurse:
if (depth > 100)
elt = build_string ("*too-deep*");
depth++;
switch (SWITCH_ENUM_CAST (XTYPE (elt)))
{
case Lisp_String:
{
/* A string: output it and check for %-constructs within it. */
unsigned char c;
int offset = 0;
if (SCHARS (elt) > 0
&& (!NILP (props) || risky))
{
Lisp_Object oprops, aelt;
oprops = Ftext_properties_at (make_number (0), elt);
/* If the starting string's properties are not what
we want, translate the string. Also, if the string
is risky, do that anyway. */
if (NILP (Fequal (props, oprops)) || risky)
{
/* If the starting string has properties,
merge the specified ones onto the existing ones. */
if (! NILP (oprops) && !risky)
{
Lisp_Object tem;
oprops = Fcopy_sequence (oprops);
tem = props;
while (CONSP (tem))
{
oprops = Fplist_put (oprops, XCAR (tem),
XCAR (XCDR (tem)));
tem = XCDR (XCDR (tem));
}
props = oprops;
}
aelt = Fassoc (elt, mode_line_proptrans_alist);
if (! NILP (aelt) && !NILP (Fequal (props, XCDR (aelt))))
{
/* AELT is what we want. Move it to the front
without consing. */
elt = XCAR (aelt);
mode_line_proptrans_alist
= move_elt_to_front (aelt, mode_line_proptrans_alist);
}
else
{
Lisp_Object tem;
/* If AELT has the wrong props, it is useless.
so get rid of it. */
if (! NILP (aelt))
mode_line_proptrans_alist
= Fdelq (aelt, mode_line_proptrans_alist);
elt = Fcopy_sequence (elt);
Fset_text_properties (make_number (0), Flength (elt),
props, elt);
/* Add this item to mode_line_proptrans_alist. */
mode_line_proptrans_alist
= Fcons (Fcons (elt, props),
mode_line_proptrans_alist);
/* Truncate mode_line_proptrans_alist
to at most 50 elements. */
tem = Fnthcdr (make_number (50),
mode_line_proptrans_alist);
if (! NILP (tem))
XSETCDR (tem, Qnil);
}
}
}
offset = 0;
if (literal)
{
prec = precision - n;
switch (mode_line_target)
{
case MODE_LINE_NOPROP:
case MODE_LINE_TITLE:
n += store_mode_line_noprop (SDATA (elt), -1, prec);
break;
case MODE_LINE_STRING:
n += store_mode_line_string (NULL, elt, 1, 0, prec, Qnil);
break;
case MODE_LINE_DISPLAY:
n += display_string (NULL, elt, Qnil, 0, 0, it,
0, prec, 0, STRING_MULTIBYTE (elt));
break;
}
break;
}
/* Handle the non-literal case. */
while ((precision <= 0 || n < precision)
&& SREF (elt, offset) != 0
&& (mode_line_target != MODE_LINE_DISPLAY
|| it->current_x < it->last_visible_x))
{
int last_offset = offset;
/* Advance to end of string or next format specifier. */
while ((c = SREF (elt, offset++)) != '\0' && c != '%')
;
if (offset - 1 != last_offset)
{
int nchars, nbytes;
/* Output to end of string or up to '%'. Field width
is length of string. Don't output more than
PRECISION allows us. */
offset--;
prec = c_string_width (SDATA (elt) + last_offset,
offset - last_offset, precision - n,
&nchars, &nbytes);
switch (mode_line_target)
{
case MODE_LINE_NOPROP:
case MODE_LINE_TITLE:
n += store_mode_line_noprop (SDATA (elt) + last_offset, 0, prec);
break;
case MODE_LINE_STRING:
{
int bytepos = last_offset;
int charpos = string_byte_to_char (elt, bytepos);
int endpos = (precision <= 0
? string_byte_to_char (elt, offset)
: charpos + nchars);
n += store_mode_line_string (NULL,
Fsubstring (elt, make_number (charpos),
make_number (endpos)),
0, 0, 0, Qnil);
}
break;
case MODE_LINE_DISPLAY:
{
int bytepos = last_offset;
int charpos = string_byte_to_char (elt, bytepos);
if (precision <= 0)
nchars = string_byte_to_char (elt, offset) - charpos;
n += display_string (NULL, elt, Qnil, 0, charpos,
it, 0, nchars, 0,
STRING_MULTIBYTE (elt));
}
break;
}
}
else /* c == '%' */
{
int percent_position = offset;
/* Get the specified minimum width. Zero means
don't pad. */
field = 0;
while ((c = SREF (elt, offset++)) >= '0' && c <= '9')
field = field * 10 + c - '0';
/* Don't pad beyond the total padding allowed. */
if (field_width - n > 0 && field > field_width - n)
field = field_width - n;
/* Note that either PRECISION <= 0 or N < PRECISION. */
prec = precision - n;
if (c == 'M')
n += display_mode_element (it, depth, field, prec,
Vglobal_mode_string, props,
risky);
else if (c != 0)
{
int multibyte;
int bytepos, charpos;
unsigned char *spec;
Lisp_Object string;
bytepos = percent_position;
charpos = (STRING_MULTIBYTE (elt)
? string_byte_to_char (elt, bytepos)
: bytepos);
spec = decode_mode_spec (it->w, c, field, prec, &string);
multibyte = STRINGP (string) && STRING_MULTIBYTE (string);
switch (mode_line_target)
{
case MODE_LINE_NOPROP:
case MODE_LINE_TITLE:
n += store_mode_line_noprop (spec, field, prec);
break;
case MODE_LINE_STRING:
{
int len = strlen (spec);
Lisp_Object tem = make_string (spec, len);
props = Ftext_properties_at (make_number (charpos), elt);
/* Should only keep face property in props */
n += store_mode_line_string (NULL, tem, 0, field, prec, props);
}
break;
case MODE_LINE_DISPLAY:
{
int nglyphs_before, nwritten;
nglyphs_before = it->glyph_row->used[TEXT_AREA];
nwritten = display_string (spec, string, elt,
charpos, 0, it,
field, prec, 0,
multibyte);
/* Assign to the glyphs written above the
string where the `%x' came from, position
of the `%'. */
if (nwritten > 0)
{
struct glyph *glyph
= (it->glyph_row->glyphs[TEXT_AREA]
+ nglyphs_before);
int i;
for (i = 0; i < nwritten; ++i)
{
glyph[i].object = elt;
glyph[i].charpos = charpos;
}
n += nwritten;
}
}
break;
}
}
else /* c == 0 */
break;
}
}
}
break;
case Lisp_Symbol:
/* A symbol: process the value of the symbol recursively
as if it appeared here directly. Avoid error if symbol void.
Special case: if value of symbol is a string, output the string
literally. */
{
register Lisp_Object tem;
/* If the variable is not marked as risky to set
then its contents are risky to use. */
if (NILP (Fget (elt, Qrisky_local_variable)))
risky = 1;
tem = Fboundp (elt);
if (!NILP (tem))
{
tem = Fsymbol_value (elt);
/* If value is a string, output that string literally:
don't check for % within it. */
if (STRINGP (tem))
literal = 1;
if (!EQ (tem, elt))
{
/* Give up right away for nil or t. */
elt = tem;
goto tail_recurse;
}
}
}
break;
case Lisp_Cons:
{
register Lisp_Object car, tem;
/* A cons cell: five distinct cases.
If first element is :eval or :propertize, do something special.
If first element is a string or a cons, process all the elements
and effectively concatenate them.
If first element is a negative number, truncate displaying cdr to
at most that many characters. If positive, pad (with spaces)
to at least that many characters.
If first element is a symbol, process the cadr or caddr recursively
according to whether the symbol's value is non-nil or nil. */
car = XCAR (elt);
if (EQ (car, QCeval))
{
/* An element of the form (:eval FORM) means evaluate FORM
and use the result as mode line elements. */
if (risky)
break;
if (CONSP (XCDR (elt)))
{
Lisp_Object spec;
spec = safe_eval (XCAR (XCDR (elt)));
n += display_mode_element (it, depth, field_width - n,
precision - n, spec, props,
risky);
}
}
else if (EQ (car, QCpropertize))
{
/* An element of the form (:propertize ELT PROPS...)
means display ELT but applying properties PROPS. */
if (risky)
break;
if (CONSP (XCDR (elt)))
n += display_mode_element (it, depth, field_width - n,
precision - n, XCAR (XCDR (elt)),
XCDR (XCDR (elt)), risky);
}
else if (SYMBOLP (car))
{
tem = Fboundp (car);
elt = XCDR (elt);
if (!CONSP (elt))
goto invalid;
/* elt is now the cdr, and we know it is a cons cell.
Use its car if CAR has a non-nil value. */
if (!NILP (tem))
{
tem = Fsymbol_value (car);
if (!NILP (tem))
{
elt = XCAR (elt);
goto tail_recurse;
}
}
/* Symbol's value is nil (or symbol is unbound)
Get the cddr of the original list
and if possible find the caddr and use that. */
elt = XCDR (elt);
if (NILP (elt))
break;
else if (!CONSP (elt))
goto invalid;
elt = XCAR (elt);
goto tail_recurse;
}
else if (INTEGERP (car))
{
register int lim = XINT (car);
elt = XCDR (elt);
if (lim < 0)
{
/* Negative int means reduce maximum width. */
if (precision <= 0)
precision = -lim;
else
precision = min (precision, -lim);
}
else if (lim > 0)
{
/* Padding specified. Don't let it be more than
current maximum. */
if (precision > 0)
lim = min (precision, lim);
/* If that's more padding than already wanted, queue it.
But don't reduce padding already specified even if
that is beyond the current truncation point. */
field_width = max (lim, field_width);
}
goto tail_recurse;
}
else if (STRINGP (car) || CONSP (car))
{
Lisp_Object halftail = elt;
int len = 0;
while (CONSP (elt)
&& (precision <= 0 || n < precision))
{
n += display_mode_element (it, depth,
/* Do padding only after the last
element in the list. */
(! CONSP (XCDR (elt))
? field_width - n
: 0),
precision - n, XCAR (elt),
props, risky);
elt = XCDR (elt);
len++;
if ((len & 1) == 0)
halftail = XCDR (halftail);
/* Check for cycle. */
if (EQ (halftail, elt))
break;
}
}
}
break;
default:
invalid:
elt = build_string ("*invalid*");
goto tail_recurse;
}
/* Pad to FIELD_WIDTH. */
if (field_width > 0 && n < field_width)
{
switch (mode_line_target)
{
case MODE_LINE_NOPROP:
case MODE_LINE_TITLE:
n += store_mode_line_noprop ("", field_width - n, 0);
break;
case MODE_LINE_STRING:
n += store_mode_line_string ("", Qnil, 0, field_width - n, 0, Qnil);
break;
case MODE_LINE_DISPLAY:
n += display_string ("", Qnil, Qnil, 0, 0, it, field_width - n,
0, 0, 0);
break;
}
}
return n;
}
/* Store a mode-line string element in mode_line_string_list.
If STRING is non-null, display that C string. Otherwise, the Lisp
string LISP_STRING is displayed.
FIELD_WIDTH is the minimum number of output glyphs to produce.
If STRING has fewer characters than FIELD_WIDTH, pad to the right
with spaces. FIELD_WIDTH <= 0 means don't pad.
PRECISION is the maximum number of characters to output from
STRING. PRECISION <= 0 means don't truncate the string.
If COPY_STRING is non-zero, make a copy of LISP_STRING before adding
properties to the string.
PROPS are the properties to add to the string.
The mode_line_string_face face property is always added to the string.
*/
static int
store_mode_line_string (string, lisp_string, copy_string, field_width, precision, props)
char *string;
Lisp_Object lisp_string;
int copy_string;
int field_width;
int precision;
Lisp_Object props;
{
int len;
int n = 0;
if (string != NULL)
{
len = strlen (string);
if (precision > 0 && len > precision)
len = precision;
lisp_string = make_string (string, len);
if (NILP (props))
props = mode_line_string_face_prop;
else if (!NILP (mode_line_string_face))
{
Lisp_Object face = Fplist_get (props, Qface);
props = Fcopy_sequence (props);
if (NILP (face))
face = mode_line_string_face;
else
face = Fcons (face, Fcons (mode_line_string_face, Qnil));
props = Fplist_put (props, Qface, face);
}
Fadd_text_properties (make_number (0), make_number (len),
props, lisp_string);
}
else
{
len = XFASTINT (Flength (lisp_string));
if (precision > 0 && len > precision)
{
len = precision;
lisp_string = Fsubstring (lisp_string, make_number (0), make_number (len));
precision = -1;
}
if (!NILP (mode_line_string_face))
{
Lisp_Object face;
if (NILP (props))
props = Ftext_properties_at (make_number (0), lisp_string);
face = Fplist_get (props, Qface);
if (NILP (face))
face = mode_line_string_face;
else
face = Fcons (face, Fcons (mode_line_string_face, Qnil));
props = Fcons (Qface, Fcons (face, Qnil));
if (copy_string)
lisp_string = Fcopy_sequence (lisp_string);
}
if (!NILP (props))
Fadd_text_properties (make_number (0), make_number (len),
props, lisp_string);
}
if (len > 0)
{
mode_line_string_list = Fcons (lisp_string, mode_line_string_list);
n += len;
}
if (field_width > len)
{
field_width -= len;
lisp_string = Fmake_string (make_number (field_width), make_number (' '));
if (!NILP (props))
Fadd_text_properties (make_number (0), make_number (field_width),
props, lisp_string);
mode_line_string_list = Fcons (lisp_string, mode_line_string_list);
n += field_width;
}
return n;
}
DEFUN ("format-mode-line", Fformat_mode_line, Sformat_mode_line,
1, 4, 0,
doc: /* Format a string out of a mode line format specification.
First arg FORMAT specifies the mode line format (see `mode-line-format'
for details) to use.
Optional second arg FACE specifies the face property to put
on all characters for which no face is specified.
The value t means whatever face the window's mode line currently uses
\(either `mode-line' or `mode-line-inactive', depending).
A value of nil means the default is no face property.
If FACE is an integer, the value string has no text properties.
Optional third and fourth args WINDOW and BUFFER specify the window
and buffer to use as the context for the formatting (defaults
are the selected window and the window's buffer). */)
(format, face, window, buffer)
Lisp_Object format, face, window, buffer;
{
struct it it;
int len;
struct window *w;
struct buffer *old_buffer = NULL;
int face_id = -1;
int no_props = INTEGERP (face);
int count = SPECPDL_INDEX ();
Lisp_Object str;
int string_start = 0;
if (NILP (window))
window = selected_window;
CHECK_WINDOW (window);
w = XWINDOW (window);
if (NILP (buffer))
buffer = w->buffer;
CHECK_BUFFER (buffer);
/* Make formatting the modeline a non-op when noninteractive, otherwise
there will be problems later caused by a partially initialized frame. */
if (NILP (format) || noninteractive)
return empty_unibyte_string;
if (no_props)
face = Qnil;
if (!NILP (face))
{
if (EQ (face, Qt))
face = (EQ (window, selected_window) ? Qmode_line : Qmode_line_inactive);
face_id = lookup_named_face (XFRAME (WINDOW_FRAME (w)), face, 0);
}
if (face_id < 0)
face_id = DEFAULT_FACE_ID;
if (XBUFFER (buffer) != current_buffer)
old_buffer = current_buffer;
/* Save things including mode_line_proptrans_alist,
and set that to nil so that we don't alter the outer value. */
record_unwind_protect (unwind_format_mode_line,
format_mode_line_unwind_data
(old_buffer, selected_window, 1));
mode_line_proptrans_alist = Qnil;
Fselect_window (window, Qt);
if (old_buffer)
set_buffer_internal_1 (XBUFFER (buffer));
init_iterator (&it, w, -1, -1, NULL, face_id);
if (no_props)
{
mode_line_target = MODE_LINE_NOPROP;
mode_line_string_face_prop = Qnil;
mode_line_string_list = Qnil;
string_start = MODE_LINE_NOPROP_LEN (0);
}
else
{
mode_line_target = MODE_LINE_STRING;
mode_line_string_list = Qnil;
mode_line_string_face = face;
mode_line_string_face_prop
= (NILP (face) ? Qnil : Fcons (Qface, Fcons (face, Qnil)));
}
push_kboard (FRAME_KBOARD (it.f));
display_mode_element (&it, 0, 0, 0, format, Qnil, 0);
pop_kboard ();
if (no_props)
{
len = MODE_LINE_NOPROP_LEN (string_start);
str = make_string (mode_line_noprop_buf + string_start, len);
}
else
{
mode_line_string_list = Fnreverse (mode_line_string_list);
str = Fmapconcat (intern ("identity"), mode_line_string_list,
empty_unibyte_string);
}
unbind_to (count, Qnil);
return str;
}
/* Write a null-terminated, right justified decimal representation of
the positive integer D to BUF using a minimal field width WIDTH. */
static void
pint2str (buf, width, d)
register char *buf;
register int width;
register int d;
{
register char *p = buf;
if (d <= 0)
*p++ = '0';
else
{
while (d > 0)
{
*p++ = d % 10 + '0';
d /= 10;
}
}
for (width -= (int) (p - buf); width > 0; --width)
*p++ = ' ';
*p-- = '\0';
while (p > buf)
{
d = *buf;
*buf++ = *p;
*p-- = d;
}
}
/* Write a null-terminated, right justified decimal and "human
readable" representation of the nonnegative integer D to BUF using
a minimal field width WIDTH. D should be smaller than 999.5e24. */
static const char power_letter[] =
{
0, /* not used */
'k', /* kilo */
'M', /* mega */
'G', /* giga */
'T', /* tera */
'P', /* peta */
'E', /* exa */
'Z', /* zetta */
'Y' /* yotta */
};
static void
pint2hrstr (buf, width, d)
char *buf;
int width;
int d;
{
/* We aim to represent the nonnegative integer D as
QUOTIENT.TENTHS * 10 ^ (3 * EXPONENT). */
int quotient = d;
int remainder = 0;
/* -1 means: do not use TENTHS. */
int tenths = -1;
int exponent = 0;
/* Length of QUOTIENT.TENTHS as a string. */
int length;
char * psuffix;
char * p;
if (1000 <= quotient)
{
/* Scale to the appropriate EXPONENT. */
do
{
remainder = quotient % 1000;
quotient /= 1000;
exponent++;
}
while (1000 <= quotient);
/* Round to nearest and decide whether to use TENTHS or not. */
if (quotient <= 9)
{
tenths = remainder / 100;
if (50 <= remainder % 100)
{
if (tenths < 9)
tenths++;
else
{
quotient++;
if (quotient == 10)
tenths = -1;
else
tenths = 0;
}
}
}
else
if (500 <= remainder)
{
if (quotient < 999)
quotient++;
else
{
quotient = 1;
exponent++;
tenths = 0;
}
}
}
/* Calculate the LENGTH of QUOTIENT.TENTHS as a string. */
if (tenths == -1 && quotient <= 99)
if (quotient <= 9)
length = 1;
else
length = 2;
else
length = 3;
p = psuffix = buf + max (width, length);
/* Print EXPONENT. */
if (exponent)
*psuffix++ = power_letter[exponent];
*psuffix = '\0';
/* Print TENTHS. */
if (tenths >= 0)
{
*--p = '0' + tenths;
*--p = '.';
}
/* Print QUOTIENT. */
do
{
int digit = quotient % 10;
*--p = '0' + digit;
}
while ((quotient /= 10) != 0);
/* Print leading spaces. */
while (buf < p)
*--p = ' ';
}
/* Set a mnemonic character for coding_system (Lisp symbol) in BUF.
If EOL_FLAG is 1, set also a mnemonic character for end-of-line
type of CODING_SYSTEM. Return updated pointer into BUF. */
static unsigned char invalid_eol_type[] = "(*invalid*)";
static char *
decode_mode_spec_coding (coding_system, buf, eol_flag)
Lisp_Object coding_system;
register char *buf;
int eol_flag;
{
Lisp_Object val;
int multibyte = !NILP (current_buffer->enable_multibyte_characters);
const unsigned char *eol_str;
int eol_str_len;
/* The EOL conversion we are using. */
Lisp_Object eoltype;
val = CODING_SYSTEM_SPEC (coding_system);
eoltype = Qnil;
if (!VECTORP (val)) /* Not yet decided. */
{
if (multibyte)
*buf++ = '-';
if (eol_flag)
eoltype = eol_mnemonic_undecided;
/* Don't mention EOL conversion if it isn't decided. */
}
else
{
Lisp_Object attrs;
Lisp_Object eolvalue;
attrs = AREF (val, 0);
eolvalue = AREF (val, 2);
if (multibyte)
*buf++ = XFASTINT (CODING_ATTR_MNEMONIC (attrs));
if (eol_flag)
{
/* The EOL conversion that is normal on this system. */
if (NILP (eolvalue)) /* Not yet decided. */
eoltype = eol_mnemonic_undecided;
else if (VECTORP (eolvalue)) /* Not yet decided. */
eoltype = eol_mnemonic_undecided;
else /* eolvalue is Qunix, Qdos, or Qmac. */
eoltype = (EQ (eolvalue, Qunix)
? eol_mnemonic_unix
: (EQ (eolvalue, Qdos) == 1
? eol_mnemonic_dos : eol_mnemonic_mac));
}
}
if (eol_flag)
{
/* Mention the EOL conversion if it is not the usual one. */
if (STRINGP (eoltype))
{
eol_str = SDATA (eoltype);
eol_str_len = SBYTES (eoltype);
}
else if (CHARACTERP (eoltype))
{
unsigned char *tmp = (unsigned char *) alloca (MAX_MULTIBYTE_LENGTH);
eol_str_len = CHAR_STRING (XINT (eoltype), tmp);
eol_str = tmp;
}
else
{
eol_str = invalid_eol_type;
eol_str_len = sizeof (invalid_eol_type) - 1;
}
bcopy (eol_str, buf, eol_str_len);
buf += eol_str_len;
}
return buf;
}
/* Return a string for the output of a mode line %-spec for window W,
generated by character C. PRECISION >= 0 means don't return a
string longer than that value. FIELD_WIDTH > 0 means pad the
string returned with spaces to that value. Return a Lisp string in
*STRING if the resulting string is taken from that Lisp string.
Note we operate on the current buffer for most purposes,
the exception being w->base_line_pos. */
static char lots_of_dashes[] = "--------------------------------------------------------------------------------------------------------------------------------------------";
static char *
decode_mode_spec (w, c, field_width, precision, string)
struct window *w;
register int c;
int field_width, precision;
Lisp_Object *string;
{
Lisp_Object obj;
struct frame *f = XFRAME (WINDOW_FRAME (w));
char *decode_mode_spec_buf = f->decode_mode_spec_buffer;
struct buffer *b = current_buffer;
obj = Qnil;
*string = Qnil;
switch (c)
{
case '*':
if (!NILP (b->read_only))
return "%";
if (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b))
return "*";
return "-";
case '+':
/* This differs from %* only for a modified read-only buffer. */
if (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b))
return "*";
if (!NILP (b->read_only))
return "%";
return "-";
case '&':
/* This differs from %* in ignoring read-only-ness. */
if (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b))
return "*";
return "-";
case '%':
return "%";
case '[':
{
int i;
char *p;
if (command_loop_level > 5)
return "[[[... ";
p = decode_mode_spec_buf;
for (i = 0; i < command_loop_level; i++)
*p++ = '[';
*p = 0;
return decode_mode_spec_buf;
}
case ']':
{
int i;
char *p;
if (command_loop_level > 5)
return " ...]]]";
p = decode_mode_spec_buf;
for (i = 0; i < command_loop_level; i++)
*p++ = ']';
*p = 0;
return decode_mode_spec_buf;
}
case '-':
{
register int i;
/* Let lots_of_dashes be a string of infinite length. */
if (mode_line_target == MODE_LINE_NOPROP ||
mode_line_target == MODE_LINE_STRING)
return "--";
if (field_width <= 0
|| field_width > sizeof (lots_of_dashes))
{
for (i = 0; i < FRAME_MESSAGE_BUF_SIZE (f) - 1; ++i)
decode_mode_spec_buf[i] = '-';
decode_mode_spec_buf[i] = '\0';
return decode_mode_spec_buf;
}
else
return lots_of_dashes;
}
case 'b':
obj = b->name;
break;
case 'c':
/* %c and %l are ignored in `frame-title-format'.
(In redisplay_internal, the frame title is drawn _before_ the
windows are updated, so the stuff which depends on actual
window contents (such as %l) may fail to render properly, or
even crash emacs.) */
if (mode_line_target == MODE_LINE_TITLE)
return "";
else
{
int col = (int) current_column (); /* iftc */
w->column_number_displayed = make_number (col);
pint2str (decode_mode_spec_buf, field_width, col);
return decode_mode_spec_buf;
}
case 'e':
#ifndef SYSTEM_MALLOC
{
if (NILP (Vmemory_full))
return "";
else
return "!MEM FULL! ";
}
#else
return "";
#endif
case 'F':
/* %F displays the frame name. */
if (!NILP (f->title))
return (char *) SDATA (f->title);
if (f->explicit_name || ! FRAME_WINDOW_P (f))
return (char *) SDATA (f->name);
return "Emacs";
case 'f':
obj = b->filename;
break;
case 'i':
{
int size = ZV - BEGV;
pint2str (decode_mode_spec_buf, field_width, size);
return decode_mode_spec_buf;
}
case 'I':
{
int size = ZV - BEGV;
pint2hrstr (decode_mode_spec_buf, field_width, size);
return decode_mode_spec_buf;
}
case 'l':
{
int startpos, startpos_byte, line, linepos, linepos_byte;
int topline, nlines, junk, height;
/* %c and %l are ignored in `frame-title-format'. */
if (mode_line_target == MODE_LINE_TITLE)
return "";
startpos = XMARKER (w->start)->charpos;
startpos_byte = marker_byte_position (w->start);
height = WINDOW_TOTAL_LINES (w);
/* If we decided that this buffer isn't suitable for line numbers,
don't forget that too fast. */
if (EQ (w->base_line_pos, w->buffer))
goto no_value;
/* But do forget it, if the window shows a different buffer now. */
else if (BUFFERP (w->base_line_pos))
w->base_line_pos = Qnil;
/* If the buffer is very big, don't waste time. */
if (INTEGERP (Vline_number_display_limit)
&& BUF_ZV (b) - BUF_BEGV (b) > XINT (Vline_number_display_limit))
{
w->base_line_pos = Qnil;
w->base_line_number = Qnil;
goto no_value;
}
if (INTEGERP (w->base_line_number)
&& INTEGERP (w->base_line_pos)
&& XFASTINT (w->base_line_pos) <= startpos)
{
line = XFASTINT (w->base_line_number);
linepos = XFASTINT (w->base_line_pos);
linepos_byte = buf_charpos_to_bytepos (b, linepos);
}
else
{
line = 1;
linepos = BUF_BEGV (b);
linepos_byte = BUF_BEGV_BYTE (b);
}
/* Count lines from base line to window start position. */
nlines = display_count_lines (linepos, linepos_byte,
startpos_byte,
startpos, &junk);
topline = nlines + line;
/* Determine a new base line, if the old one is too close
or too far away, or if we did not have one.
"Too close" means it's plausible a scroll-down would
go back past it. */
if (startpos == BUF_BEGV (b))
{
w->base_line_number = make_number (topline);
w->base_line_pos = make_number (BUF_BEGV (b));
}
else if (nlines < height + 25 || nlines > height * 3 + 50
|| linepos == BUF_BEGV (b))
{
int limit = BUF_BEGV (b);
int limit_byte = BUF_BEGV_BYTE (b);
int position;
int distance = (height * 2 + 30) * line_number_display_limit_width;
if (startpos - distance > limit)
{
limit = startpos - distance;
limit_byte = CHAR_TO_BYTE (limit);
}
nlines = display_count_lines (startpos, startpos_byte,
limit_byte,
- (height * 2 + 30),
&position);
/* If we couldn't find the lines we wanted within
line_number_display_limit_width chars per line,
give up on line numbers for this window. */
if (position == limit_byte && limit == startpos - distance)
{
w->base_line_pos = w->buffer;
w->base_line_number = Qnil;
goto no_value;
}
w->base_line_number = make_number (topline - nlines);
w->base_line_pos = make_number (BYTE_TO_CHAR (position));
}
/* Now count lines from the start pos to point. */
nlines = display_count_lines (startpos, startpos_byte,
PT_BYTE, PT, &junk);
/* Record that we did display the line number. */
line_number_displayed = 1;
/* Make the string to show. */
pint2str (decode_mode_spec_buf, field_width, topline + nlines);
return decode_mode_spec_buf;
no_value:
{
char* p = decode_mode_spec_buf;
int pad = field_width - 2;
while (pad-- > 0)
*p++ = ' ';
*p++ = '?';
*p++ = '?';
*p = '\0';
return decode_mode_spec_buf;
}
}
break;
case 'm':
obj = b->mode_name;
break;
case 'n':
if (BUF_BEGV (b) > BUF_BEG (b) || BUF_ZV (b) < BUF_Z (b))
return " Narrow";
break;
case 'p':
{
int pos = marker_position (w->start);
int total = BUF_ZV (b) - BUF_BEGV (b);
if (XFASTINT (w->window_end_pos) <= BUF_Z (b) - BUF_ZV (b))
{
if (pos <= BUF_BEGV (b))
return "All";
else
return "Bottom";
}
else if (pos <= BUF_BEGV (b))
return "Top";
else
{
if (total > 1000000)
/* Do it differently for a large value, to avoid overflow. */
total = ((pos - BUF_BEGV (b)) + (total / 100) - 1) / (total / 100);
else
total = ((pos - BUF_BEGV (b)) * 100 + total - 1) / total;
/* We can't normally display a 3-digit number,
so get us a 2-digit number that is close. */
if (total == 100)
total = 99;
sprintf (decode_mode_spec_buf, "%2d%%", total);
return decode_mode_spec_buf;
}
}
/* Display percentage of size above the bottom of the screen. */
case 'P':
{
int toppos = marker_position (w->start);
int botpos = BUF_Z (b) - XFASTINT (w->window_end_pos);
int total = BUF_ZV (b) - BUF_BEGV (b);
if (botpos >= BUF_ZV (b))
{
if (toppos <= BUF_BEGV (b))
return "All";
else
return "Bottom";
}
else
{
if (total > 1000000)
/* Do it differently for a large value, to avoid overflow. */
total = ((botpos - BUF_BEGV (b)) + (total / 100) - 1) / (total / 100);
else
total = ((botpos - BUF_BEGV (b)) * 100 + total - 1) / total;
/* We can't normally display a 3-digit number,
so get us a 2-digit number that is close. */
if (total == 100)
total = 99;
if (toppos <= BUF_BEGV (b))
sprintf (decode_mode_spec_buf, "Top%2d%%", total);
else
sprintf (decode_mode_spec_buf, "%2d%%", total);
return decode_mode_spec_buf;
}
}
case 's':
/* status of process */
obj = Fget_buffer_process (Fcurrent_buffer ());
if (NILP (obj))
return "no process";
#ifdef subprocesses
obj = Fsymbol_name (Fprocess_status (obj));
#endif
break;
case '@':
{
int count = inhibit_garbage_collection ();
Lisp_Object val = call1 (intern ("file-remote-p"),
current_buffer->directory);
unbind_to (count, Qnil);
if (NILP (val))
return "-";
else
return "@";
}
case 't': /* indicate TEXT or BINARY */
#ifdef MODE_LINE_BINARY_TEXT
return MODE_LINE_BINARY_TEXT (b);
#else
return "T";
#endif
case 'z':
/* coding-system (not including end-of-line format) */
case 'Z':
/* coding-system (including end-of-line type) */
{
int eol_flag = (c == 'Z');
char *p = decode_mode_spec_buf;
if (! FRAME_WINDOW_P (f))
{
/* No need to mention EOL here--the terminal never needs
to do EOL conversion. */
p = decode_mode_spec_coding (CODING_ID_NAME
(FRAME_KEYBOARD_CODING (f)->id),
p, 0);
p = decode_mode_spec_coding (CODING_ID_NAME
(FRAME_TERMINAL_CODING (f)->id),
p, 0);
}
p = decode_mode_spec_coding (b->buffer_file_coding_system,
p, eol_flag);
#if 0 /* This proves to be annoying; I think we can do without. -- rms. */
#ifdef subprocesses
obj = Fget_buffer_process (Fcurrent_buffer ());
if (PROCESSP (obj))
{
p = decode_mode_spec_coding (XPROCESS (obj)->decode_coding_system,
p, eol_flag);
p = decode_mode_spec_coding (XPROCESS (obj)->encode_coding_system,
p, eol_flag);
}
#endif /* subprocesses */
#endif /* 0 */
*p = 0;
return decode_mode_spec_buf;
}
}
if (STRINGP (obj))
{
*string = obj;
return (char *) SDATA (obj);
}
else
return "";
}
/* Count up to COUNT lines starting from START / START_BYTE.
But don't go beyond LIMIT_BYTE.
Return the number of lines thus found (always nonnegative).
Set *BYTE_POS_PTR to 1 if we found COUNT lines, 0 if we hit LIMIT. */
static int
display_count_lines (start, start_byte, limit_byte, count, byte_pos_ptr)
int start, start_byte, limit_byte, count;
int *byte_pos_ptr;
{
register unsigned char *cursor;
unsigned char *base;
register int ceiling;
register unsigned char *ceiling_addr;
int orig_count = count;
/* If we are not in selective display mode,
check only for newlines. */
int selective_display = (!NILP (current_buffer->selective_display)
&& !INTEGERP (current_buffer->selective_display));
if (count > 0)
{
while (start_byte < limit_byte)
{
ceiling = BUFFER_CEILING_OF (start_byte);
ceiling = min (limit_byte - 1, ceiling);
ceiling_addr = BYTE_POS_ADDR (ceiling) + 1;
base = (cursor = BYTE_POS_ADDR (start_byte));
while (1)
{
if (selective_display)
while (*cursor != '\n' && *cursor != 015 && ++cursor != ceiling_addr)
;
else
while (*cursor != '\n' && ++cursor != ceiling_addr)
;
if (cursor != ceiling_addr)
{
if (--count == 0)
{
start_byte += cursor - base + 1;
*byte_pos_ptr = start_byte;
return orig_count;
}
else
if (++cursor == ceiling_addr)
break;
}
else
break;
}
start_byte += cursor - base;
}
}
else
{
while (start_byte > limit_byte)
{
ceiling = BUFFER_FLOOR_OF (start_byte - 1);
ceiling = max (limit_byte, ceiling);
ceiling_addr = BYTE_POS_ADDR (ceiling) - 1;
base = (cursor = BYTE_POS_ADDR (start_byte - 1) + 1);
while (1)
{
if (selective_display)
while (--cursor != ceiling_addr
&& *cursor != '\n' && *cursor != 015)
;
else
while (--cursor != ceiling_addr && *cursor != '\n')
;
if (cursor != ceiling_addr)
{
if (++count == 0)
{
start_byte += cursor - base + 1;
*byte_pos_ptr = start_byte;
/* When scanning backwards, we should
not count the newline posterior to which we stop. */
return - orig_count - 1;
}
}
else
break;
}
/* Here we add 1 to compensate for the last decrement
of CURSOR, which took it past the valid range. */
start_byte += cursor - base + 1;
}
}
*byte_pos_ptr = limit_byte;
if (count < 0)
return - orig_count + count;
return orig_count - count;
}
/***********************************************************************
Displaying strings
***********************************************************************/
/* Display a NUL-terminated string, starting with index START.
If STRING is non-null, display that C string. Otherwise, the Lisp
string LISP_STRING is displayed. There's a case that STRING is
non-null and LISP_STRING is not nil. It means STRING is a string
data of LISP_STRING. In that case, we display LISP_STRING while
ignoring its text properties.
If FACE_STRING is not nil, FACE_STRING_POS is a position in
FACE_STRING. Display STRING or LISP_STRING with the face at
FACE_STRING_POS in FACE_STRING:
Display the string in the environment given by IT, but use the
standard display table, temporarily.
FIELD_WIDTH is the minimum number of output glyphs to produce.
If STRING has fewer characters than FIELD_WIDTH, pad to the right
with spaces. If STRING has more characters, more than FIELD_WIDTH
glyphs will be produced. FIELD_WIDTH <= 0 means don't pad.
PRECISION is the maximum number of characters to output from
STRING. PRECISION < 0 means don't truncate the string.
This is roughly equivalent to printf format specifiers:
FIELD_WIDTH PRECISION PRINTF
----------------------------------------
-1 -1 %s
-1 10 %.10s
10 -1 %10s
20 10 %20.10s
MULTIBYTE zero means do not display multibyte chars, > 0 means do
display them, and < 0 means obey the current buffer's value of
enable_multibyte_characters.
Value is the number of columns displayed. */
static int
display_string (string, lisp_string, face_string, face_string_pos,
start, it, field_width, precision, max_x, multibyte)
unsigned char *string;
Lisp_Object lisp_string;
Lisp_Object face_string;
EMACS_INT face_string_pos;
EMACS_INT start;
struct it *it;
int field_width, precision, max_x;
int multibyte;
{
int hpos_at_start = it->hpos;
int saved_face_id = it->face_id;
struct glyph_row *row = it->glyph_row;
/* Initialize the iterator IT for iteration over STRING beginning
with index START. */
reseat_to_string (it, NILP (lisp_string) ? string : NULL, lisp_string, start,
precision, field_width, multibyte);
if (string && STRINGP (lisp_string))
/* LISP_STRING is the one returned by decode_mode_spec. We should
ignore its text properties. */
it->stop_charpos = -1;
/* If displaying STRING, set up the face of the iterator
from LISP_STRING, if that's given. */
if (STRINGP (face_string))
{
EMACS_INT endptr;
struct face *face;
it->face_id
= face_at_string_position (it->w, face_string, face_string_pos,
0, it->region_beg_charpos,
it->region_end_charpos,
&endptr, it->base_face_id, 0);
face = FACE_FROM_ID (it->f, it->face_id);
it->face_box_p = face->box != FACE_NO_BOX;
}
/* Set max_x to the maximum allowed X position. Don't let it go
beyond the right edge of the window. */
if (max_x <= 0)
max_x = it->last_visible_x;
else
max_x = min (max_x, it->last_visible_x);
/* Skip over display elements that are not visible. because IT->w is
hscrolled. */
if (it->current_x < it->first_visible_x)
move_it_in_display_line_to (it, 100000, it->first_visible_x,
MOVE_TO_POS | MOVE_TO_X);
row->ascent = it->max_ascent;
row->height = it->max_ascent + it->max_descent;
row->phys_ascent = it->max_phys_ascent;
row->phys_height = it->max_phys_ascent + it->max_phys_descent;
row->extra_line_spacing = it->max_extra_line_spacing;
/* This condition is for the case that we are called with current_x
past last_visible_x. */
while (it->current_x < max_x)
{
int x_before, x, n_glyphs_before, i, nglyphs;
/* Get the next display element. */
if (!get_next_display_element (it))
break;
/* Produce glyphs. */
x_before = it->current_x;
n_glyphs_before = it->glyph_row->used[TEXT_AREA];
PRODUCE_GLYPHS (it);
nglyphs = it->glyph_row->used[TEXT_AREA] - n_glyphs_before;
i = 0;
x = x_before;
while (i < nglyphs)
{
struct glyph *glyph = row->glyphs[TEXT_AREA] + n_glyphs_before + i;
if (it->line_wrap != TRUNCATE
&& x + glyph->pixel_width > max_x)
{
/* End of continued line or max_x reached. */
if (CHAR_GLYPH_PADDING_P (*glyph))
{
/* A wide character is unbreakable. */
it->glyph_row->used[TEXT_AREA] = n_glyphs_before;
it->current_x = x_before;
}
else
{
it->glyph_row->used[TEXT_AREA] = n_glyphs_before + i;
it->current_x = x;
}
break;
}
else if (x + glyph->pixel_width >= it->first_visible_x)
{
/* Glyph is at least partially visible. */
++it->hpos;
if (x < it->first_visible_x)
it->glyph_row->x = x - it->first_visible_x;
}
else
{
/* Glyph is off the left margin of the display area.
Should not happen. */
abort ();
}
row->ascent = max (row->ascent, it->max_ascent);
row->height = max (row->height, it->max_ascent + it->max_descent);
row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent);
row->phys_height = max (row->phys_height,
it->max_phys_ascent + it->max_phys_descent);
row->extra_line_spacing = max (row->extra_line_spacing,
it->max_extra_line_spacing);
x += glyph->pixel_width;
++i;
}
/* Stop if max_x reached. */
if (i < nglyphs)
break;
/* Stop at line ends. */
if (ITERATOR_AT_END_OF_LINE_P (it))
{
it->continuation_lines_width = 0;
break;
}
set_iterator_to_next (it, 1);
/* Stop if truncating at the right edge. */
if (it->line_wrap == TRUNCATE
&& it->current_x >= it->last_visible_x)
{
/* Add truncation mark, but don't do it if the line is
truncated at a padding space. */
if (IT_CHARPOS (*it) < it->string_nchars)
{
if (!FRAME_WINDOW_P (it->f))
{
int i, n;
if (it->current_x > it->last_visible_x)
{
for (i = row->used[TEXT_AREA] - 1; i > 0; --i)
if (!CHAR_GLYPH_PADDING_P (row->glyphs[TEXT_AREA][i]))
break;
for (n = row->used[TEXT_AREA]; i < n; ++i)
{
row->used[TEXT_AREA] = i;
produce_special_glyphs (it, IT_TRUNCATION);
}
}
produce_special_glyphs (it, IT_TRUNCATION);
}
it->glyph_row->truncated_on_right_p = 1;
}
break;
}
}
/* Maybe insert a truncation at the left. */
if (it->first_visible_x
&& IT_CHARPOS (*it) > 0)
{
if (!FRAME_WINDOW_P (it->f))
insert_left_trunc_glyphs (it);
it->glyph_row->truncated_on_left_p = 1;
}
it->face_id = saved_face_id;
/* Value is number of columns displayed. */
return it->hpos - hpos_at_start;
}
/* This is like a combination of memq and assq. Return 1/2 if PROPVAL
appears as an element of LIST or as the car of an element of LIST.
If PROPVAL is a list, compare each element against LIST in that
way, and return 1/2 if any element of PROPVAL is found in LIST.
Otherwise return 0. This function cannot quit.
The return value is 2 if the text is invisible but with an ellipsis
and 1 if it's invisible and without an ellipsis. */
int
invisible_p (propval, list)
register Lisp_Object propval;
Lisp_Object list;
{
register Lisp_Object tail, proptail;
for (tail = list; CONSP (tail); tail = XCDR (tail))
{
register Lisp_Object tem;
tem = XCAR (tail);
if (EQ (propval, tem))
return 1;
if (CONSP (tem) && EQ (propval, XCAR (tem)))
return NILP (XCDR (tem)) ? 1 : 2;
}
if (CONSP (propval))
{
for (proptail = propval; CONSP (proptail); proptail = XCDR (proptail))
{
Lisp_Object propelt;
propelt = XCAR (proptail);
for (tail = list; CONSP (tail); tail = XCDR (tail))
{
register Lisp_Object tem;
tem = XCAR (tail);
if (EQ (propelt, tem))
return 1;
if (CONSP (tem) && EQ (propelt, XCAR (tem)))
return NILP (XCDR (tem)) ? 1 : 2;
}
}
}
return 0;
}
DEFUN ("invisible-p", Finvisible_p, Sinvisible_p, 1, 1, 0,
doc: /* Non-nil if the property makes the text invisible.
POS-OR-PROP can be a marker or number, in which case it is taken to be
a position in the current buffer and the value of the `invisible' property
is checked; or it can be some other value, which is then presumed to be the
value of the `invisible' property of the text of interest.
The non-nil value returned can be t for truly invisible text or something
else if the text is replaced by an ellipsis. */)
(pos_or_prop)
Lisp_Object pos_or_prop;
{
Lisp_Object prop
= (NATNUMP (pos_or_prop) || MARKERP (pos_or_prop)
? Fget_char_property (pos_or_prop, Qinvisible, Qnil)
: pos_or_prop);
int invis = TEXT_PROP_MEANS_INVISIBLE (prop);
return (invis == 0 ? Qnil
: invis == 1 ? Qt
: make_number (invis));
}
/* Calculate a width or height in pixels from a specification using
the following elements:
SPEC ::=
NUM - a (fractional) multiple of the default font width/height
(NUM) - specifies exactly NUM pixels
UNIT - a fixed number of pixels, see below.
ELEMENT - size of a display element in pixels, see below.
(NUM . SPEC) - equals NUM * SPEC
(+ SPEC SPEC ...) - add pixel values
(- SPEC SPEC ...) - subtract pixel values
(- SPEC) - negate pixel value
NUM ::=
INT or FLOAT - a number constant
SYMBOL - use symbol's (buffer local) variable binding.
UNIT ::=
in - pixels per inch *)
mm - pixels per 1/1000 meter *)
cm - pixels per 1/100 meter *)
width - width of current font in pixels.
height - height of current font in pixels.
*) using the ratio(s) defined in display-pixels-per-inch.
ELEMENT ::=
left-fringe - left fringe width in pixels
right-fringe - right fringe width in pixels
left-margin - left margin width in pixels
right-margin - right margin width in pixels
scroll-bar - scroll-bar area width in pixels
Examples:
Pixels corresponding to 5 inches:
(5 . in)
Total width of non-text areas on left side of window (if scroll-bar is on left):
'(space :width (+ left-fringe left-margin scroll-bar))
Align to first text column (in header line):
'(space :align-to 0)
Align to middle of text area minus half the width of variable `my-image'
containing a loaded image:
'(space :align-to (0.5 . (- text my-image)))
Width of left margin minus width of 1 character in the default font:
'(space :width (- left-margin 1))
Width of left margin minus width of 2 characters in the current font:
'(space :width (- left-margin (2 . width)))
Center 1 character over left-margin (in header line):
'(space :align-to (+ left-margin (0.5 . left-margin) -0.5))
Different ways to express width of left fringe plus left margin minus one pixel:
'(space :width (- (+ left-fringe left-margin) (1)))
'(space :width (+ left-fringe left-margin (- (1))))
'(space :width (+ left-fringe left-margin (-1)))
*/
#define NUMVAL(X) \
((INTEGERP (X) || FLOATP (X)) \
? XFLOATINT (X) \
: - 1)
int
calc_pixel_width_or_height (res, it, prop, font, width_p, align_to)
double *res;
struct it *it;
Lisp_Object prop;
struct font *font;
int width_p, *align_to;
{
double pixels;
#define OK_PIXELS(val) ((*res = (double)(val)), 1)
#define OK_ALIGN_TO(val) ((*align_to = (int)(val)), 1)
if (NILP (prop))
return OK_PIXELS (0);
xassert (FRAME_LIVE_P (it->f));
if (SYMBOLP (prop))
{
if (SCHARS (SYMBOL_NAME (prop)) == 2)
{
char *unit = SDATA (SYMBOL_NAME (prop));
if (unit[0] == 'i' && unit[1] == 'n')
pixels = 1.0;
else if (unit[0] == 'm' && unit[1] == 'm')
pixels = 25.4;
else if (unit[0] == 'c' && unit[1] == 'm')
pixels = 2.54;
else
pixels = 0;
if (pixels > 0)
{
double ppi;
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (it->f)
&& (ppi = (width_p
? FRAME_X_DISPLAY_INFO (it->f)->resx
: FRAME_X_DISPLAY_INFO (it->f)->resy),
ppi > 0))
return OK_PIXELS (ppi / pixels);
#endif
if ((ppi = NUMVAL (Vdisplay_pixels_per_inch), ppi > 0)
|| (CONSP (Vdisplay_pixels_per_inch)
&& (ppi = (width_p
? NUMVAL (XCAR (Vdisplay_pixels_per_inch))
: NUMVAL (XCDR (Vdisplay_pixels_per_inch))),
ppi > 0)))
return OK_PIXELS (ppi / pixels);
return 0;
}
}
#ifdef HAVE_WINDOW_SYSTEM
if (EQ (prop, Qheight))
return OK_PIXELS (font ? FONT_HEIGHT (font) : FRAME_LINE_HEIGHT (it->f));
if (EQ (prop, Qwidth))
return OK_PIXELS (font ? FONT_WIDTH (font) : FRAME_COLUMN_WIDTH (it->f));
#else
if (EQ (prop, Qheight) || EQ (prop, Qwidth))
return OK_PIXELS (1);
#endif
if (EQ (prop, Qtext))
return OK_PIXELS (width_p
? window_box_width (it->w, TEXT_AREA)
: WINDOW_BOX_HEIGHT_NO_MODE_LINE (it->w));
if (align_to && *align_to < 0)
{
*res = 0;
if (EQ (prop, Qleft))
return OK_ALIGN_TO (window_box_left_offset (it->w, TEXT_AREA));
if (EQ (prop, Qright))
return OK_ALIGN_TO (window_box_right_offset (it->w, TEXT_AREA));
if (EQ (prop, Qcenter))
return OK_ALIGN_TO (window_box_left_offset (it->w, TEXT_AREA)
+ window_box_width (it->w, TEXT_AREA) / 2);
if (EQ (prop, Qleft_fringe))
return OK_ALIGN_TO (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (it->w)
? WINDOW_LEFT_SCROLL_BAR_AREA_WIDTH (it->w)
: window_box_right_offset (it->w, LEFT_MARGIN_AREA));
if (EQ (prop, Qright_fringe))
return OK_ALIGN_TO (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (it->w)
? window_box_right_offset (it->w, RIGHT_MARGIN_AREA)
: window_box_right_offset (it->w, TEXT_AREA));
if (EQ (prop, Qleft_margin))
return OK_ALIGN_TO (window_box_left_offset (it->w, LEFT_MARGIN_AREA));
if (EQ (prop, Qright_margin))
return OK_ALIGN_TO (window_box_left_offset (it->w, RIGHT_MARGIN_AREA));
if (EQ (prop, Qscroll_bar))
return OK_ALIGN_TO (WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_LEFT (it->w)
? 0
: (window_box_right_offset (it->w, RIGHT_MARGIN_AREA)
+ (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (it->w)
? WINDOW_RIGHT_FRINGE_WIDTH (it->w)
: 0)));
}
else
{
if (EQ (prop, Qleft_fringe))
return OK_PIXELS (WINDOW_LEFT_FRINGE_WIDTH (it->w));
if (EQ (prop, Qright_fringe))
return OK_PIXELS (WINDOW_RIGHT_FRINGE_WIDTH (it->w));
if (EQ (prop, Qleft_margin))
return OK_PIXELS (WINDOW_LEFT_MARGIN_WIDTH (it->w));
if (EQ (prop, Qright_margin))
return OK_PIXELS (WINDOW_RIGHT_MARGIN_WIDTH (it->w));
if (EQ (prop, Qscroll_bar))
return OK_PIXELS (WINDOW_SCROLL_BAR_AREA_WIDTH (it->w));
}
prop = Fbuffer_local_value (prop, it->w->buffer);
}
if (INTEGERP (prop) || FLOATP (prop))
{
int base_unit = (width_p
? FRAME_COLUMN_WIDTH (it->f)
: FRAME_LINE_HEIGHT (it->f));
return OK_PIXELS (XFLOATINT (prop) * base_unit);
}
if (CONSP (prop))
{
Lisp_Object car = XCAR (prop);
Lisp_Object cdr = XCDR (prop);
if (SYMBOLP (car))
{
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (it->f)
&& valid_image_p (prop))
{
int id = lookup_image (it->f, prop);
struct image *img = IMAGE_FROM_ID (it->f, id);
return OK_PIXELS (width_p ? img->width : img->height);
}
#endif
if (EQ (car, Qplus) || EQ (car, Qminus))
{
int first = 1;
double px;
pixels = 0;
while (CONSP (cdr))
{
if (!calc_pixel_width_or_height (&px, it, XCAR (cdr),
font, width_p, align_to))
return 0;
if (first)
pixels = (EQ (car, Qplus) ? px : -px), first = 0;
else
pixels += px;
cdr = XCDR (cdr);
}
if (EQ (car, Qminus))
pixels = -pixels;
return OK_PIXELS (pixels);
}
car = Fbuffer_local_value (car, it->w->buffer);
}
if (INTEGERP (car) || FLOATP (car))
{
double fact;
pixels = XFLOATINT (car);
if (NILP (cdr))
return OK_PIXELS (pixels);
if (calc_pixel_width_or_height (&fact, it, cdr,
font, width_p, align_to))
return OK_PIXELS (pixels * fact);
return 0;
}
return 0;
}
return 0;
}
/***********************************************************************
Glyph Display
***********************************************************************/
#ifdef HAVE_WINDOW_SYSTEM
#if GLYPH_DEBUG
void
dump_glyph_string (s)
struct glyph_string *s;
{
fprintf (stderr, "glyph string\n");
fprintf (stderr, " x, y, w, h = %d, %d, %d, %d\n",
s->x, s->y, s->width, s->height);
fprintf (stderr, " ybase = %d\n", s->ybase);
fprintf (stderr, " hl = %d\n", s->hl);
fprintf (stderr, " left overhang = %d, right = %d\n",
s->left_overhang, s->right_overhang);
fprintf (stderr, " nchars = %d\n", s->nchars);
fprintf (stderr, " extends to end of line = %d\n",
s->extends_to_end_of_line_p);
fprintf (stderr, " font height = %d\n", FONT_HEIGHT (s->font));
fprintf (stderr, " bg width = %d\n", s->background_width);
}
#endif /* GLYPH_DEBUG */
/* Initialize glyph string S. CHAR2B is a suitably allocated vector
of XChar2b structures for S; it can't be allocated in
init_glyph_string because it must be allocated via `alloca'. W
is the window on which S is drawn. ROW and AREA are the glyph row
and area within the row from which S is constructed. START is the
index of the first glyph structure covered by S. HL is a
face-override for drawing S. */
#ifdef HAVE_NTGUI
#define OPTIONAL_HDC(hdc) hdc,
#define DECLARE_HDC(hdc) HDC hdc;
#define ALLOCATE_HDC(hdc, f) hdc = get_frame_dc ((f))
#define RELEASE_HDC(hdc, f) release_frame_dc ((f), (hdc))
#endif
#ifndef OPTIONAL_HDC
#define OPTIONAL_HDC(hdc)
#define DECLARE_HDC(hdc)
#define ALLOCATE_HDC(hdc, f)
#define RELEASE_HDC(hdc, f)
#endif
static void
init_glyph_string (s, OPTIONAL_HDC (hdc) char2b, w, row, area, start, hl)
struct glyph_string *s;
DECLARE_HDC (hdc)
XChar2b *char2b;
struct window *w;
struct glyph_row *row;
enum glyph_row_area area;
int start;
enum draw_glyphs_face hl;
{
bzero (s, sizeof *s);
s->w = w;
s->f = XFRAME (w->frame);
#ifdef HAVE_NTGUI
s->hdc = hdc;
#endif
s->display = FRAME_X_DISPLAY (s->f);
s->window = FRAME_X_WINDOW (s->f);
s->char2b = char2b;
s->hl = hl;
s->row = row;
s->area = area;
s->first_glyph = row->glyphs[area] + start;
s->height = row->height;
s->y = WINDOW_TO_FRAME_PIXEL_Y (w, row->y);
s->ybase = s->y + row->ascent;
}
/* Append the list of glyph strings with head H and tail T to the list
with head *HEAD and tail *TAIL. Set *HEAD and *TAIL to the result. */
static INLINE void
append_glyph_string_lists (head, tail, h, t)
struct glyph_string **head, **tail;
struct glyph_string *h, *t;
{
if (h)
{
if (*head)
(*tail)->next = h;
else
*head = h;
h->prev = *tail;
*tail = t;
}
}
/* Prepend the list of glyph strings with head H and tail T to the
list with head *HEAD and tail *TAIL. Set *HEAD and *TAIL to the
result. */
static INLINE void
prepend_glyph_string_lists (head, tail, h, t)
struct glyph_string **head, **tail;
struct glyph_string *h, *t;
{
if (h)
{
if (*head)
(*head)->prev = t;
else
*tail = t;
t->next = *head;
*head = h;
}
}
/* Append glyph string S to the list with head *HEAD and tail *TAIL.
Set *HEAD and *TAIL to the resulting list. */
static INLINE void
append_glyph_string (head, tail, s)
struct glyph_string **head, **tail;
struct glyph_string *s;
{
s->next = s->prev = NULL;
append_glyph_string_lists (head, tail, s, s);
}
/* Get face and two-byte form of character C in face FACE_ID on frame
F. The encoding of C is returned in *CHAR2B. MULTIBYTE_P non-zero
means we want to display multibyte text. DISPLAY_P non-zero means
make sure that X resources for the face returned are allocated.
Value is a pointer to a realized face that is ready for display if
DISPLAY_P is non-zero. */
static INLINE struct face *
get_char_face_and_encoding (f, c, face_id, char2b, multibyte_p, display_p)
struct frame *f;
int c, face_id;
XChar2b *char2b;
int multibyte_p, display_p;
{
struct face *face = FACE_FROM_ID (f, face_id);
if (face->font)
{
unsigned code = face->font->driver->encode_char (face->font, c);
if (code != FONT_INVALID_CODE)
STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
else
STORE_XCHAR2B (char2b, 0, 0);
}
/* Make sure X resources of the face are allocated. */
#ifdef HAVE_X_WINDOWS
if (display_p)
#endif
{
xassert (face != NULL);
PREPARE_FACE_FOR_DISPLAY (f, face);
}
return face;
}
/* Get face and two-byte form of character glyph GLYPH on frame F.
The encoding of GLYPH->u.ch is returned in *CHAR2B. Value is
a pointer to a realized face that is ready for display. */
static INLINE struct face *
get_glyph_face_and_encoding (f, glyph, char2b, two_byte_p)
struct frame *f;
struct glyph *glyph;
XChar2b *char2b;
int *two_byte_p;
{
struct face *face;
xassert (glyph->type == CHAR_GLYPH);
face = FACE_FROM_ID (f, glyph->face_id);
if (two_byte_p)
*two_byte_p = 0;
if (face->font)
{
unsigned code = face->font->driver->encode_char (face->font, glyph->u.ch);
if (code != FONT_INVALID_CODE)
STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
else
STORE_XCHAR2B (char2b, 0, 0);
}
/* Make sure X resources of the face are allocated. */
xassert (face != NULL);
PREPARE_FACE_FOR_DISPLAY (f, face);
return face;
}
/* Fill glyph string S with composition components specified by S->cmp.
BASE_FACE is the base face of the composition.
S->cmp_from is the index of the first component for S.
OVERLAPS non-zero means S should draw the foreground only, and use
its physical height for clipping. See also draw_glyphs.
Value is the index of a component not in S. */
static int
fill_composite_glyph_string (s, base_face, overlaps)
struct glyph_string *s;
struct face *base_face;
int overlaps;
{
int i;
/* For all glyphs of this composition, starting at the offset
S->cmp_from, until we reach the end of the definition or encounter a
glyph that requires the different face, add it to S. */
struct face *face;
xassert (s);
s->for_overlaps = overlaps;
s->face = NULL;
s->font = NULL;
for (i = s->cmp_from; i < s->cmp->glyph_len; i++)
{
int c = COMPOSITION_GLYPH (s->cmp, i);
if (c != '\t')
{
int face_id = FACE_FOR_CHAR (s->f, base_face->ascii_face, c,
-1, Qnil);
face = get_char_face_and_encoding (s->f, c, face_id,
s->char2b + i, 1, 1);
if (face)
{
if (! s->face)
{
s->face = face;
s->font = s->face->font;
}
else if (s->face != face)
break;
}
}
++s->nchars;
}
s->cmp_to = i;
/* All glyph strings for the same composition has the same width,
i.e. the width set for the first component of the composition. */
s->width = s->first_glyph->pixel_width;
/* If the specified font could not be loaded, use the frame's
default font, but record the fact that we couldn't load it in
the glyph string so that we can draw rectangles for the
characters of the glyph string. */
if (s->font == NULL)
{
s->font_not_found_p = 1;
s->font = FRAME_FONT (s->f);
}
/* Adjust base line for subscript/superscript text. */
s->ybase += s->first_glyph->voffset;
/* This glyph string must always be drawn with 16-bit functions. */
s->two_byte_p = 1;
return s->cmp_to;
}
static int
fill_gstring_glyph_string (s, face_id, start, end, overlaps)
struct glyph_string *s;
int face_id;
int start, end, overlaps;
{
struct glyph *glyph, *last;
Lisp_Object lgstring;
int i;
s->for_overlaps = overlaps;
glyph = s->row->glyphs[s->area] + start;
last = s->row->glyphs[s->area] + end;
s->cmp_id = glyph->u.cmp.id;
s->cmp_from = glyph->u.cmp.from;
s->cmp_to = glyph->u.cmp.to + 1;
s->face = FACE_FROM_ID (s->f, face_id);
lgstring = composition_gstring_from_id (s->cmp_id);
s->font = XFONT_OBJECT (LGSTRING_FONT (lgstring));
glyph++;
while (glyph < last
&& glyph->u.cmp.automatic
&& glyph->u.cmp.id == s->cmp_id
&& s->cmp_to == glyph->u.cmp.from)
s->cmp_to = (glyph++)->u.cmp.to + 1;
for (i = s->cmp_from; i < s->cmp_to; i++)
{
Lisp_Object lglyph = LGSTRING_GLYPH (lgstring, i);
unsigned code = LGLYPH_CODE (lglyph);
STORE_XCHAR2B ((s->char2b + i), code >> 8, code & 0xFF);
}
s->width = composition_gstring_width (lgstring, s->cmp_from, s->cmp_to, NULL);
return glyph - s->row->glyphs[s->area];
}
/* Fill glyph string S from a sequence of character glyphs.
FACE_ID is the face id of the string. START is the index of the
first glyph to consider, END is the index of the last + 1.
OVERLAPS non-zero means S should draw the foreground only, and use
its physical height for clipping. See also draw_glyphs.
Value is the index of the first glyph not in S. */
static int
fill_glyph_string (s, face_id, start, end, overlaps)
struct glyph_string *s;
int face_id;
int start, end, overlaps;
{
struct glyph *glyph, *last;
int voffset;
int glyph_not_available_p;
xassert (s->f == XFRAME (s->w->frame));
xassert (s->nchars == 0);
xassert (start >= 0 && end > start);
s->for_overlaps = overlaps;
glyph = s->row->glyphs[s->area] + start;
last = s->row->glyphs[s->area] + end;
voffset = glyph->voffset;
s->padding_p = glyph->padding_p;
glyph_not_available_p = glyph->glyph_not_available_p;
while (glyph < last
&& glyph->type == CHAR_GLYPH
&& glyph->voffset == voffset
/* Same face id implies same font, nowadays. */
&& glyph->face_id == face_id
&& glyph->glyph_not_available_p == glyph_not_available_p)
{
int two_byte_p;
s->face = get_glyph_face_and_encoding (s->f, glyph,
s->char2b + s->nchars,
&two_byte_p);
s->two_byte_p = two_byte_p;
++s->nchars;
xassert (s->nchars <= end - start);
s->width += glyph->pixel_width;
if (glyph++->padding_p != s->padding_p)
break;
}
s->font = s->face->font;
/* If the specified font could not be loaded, use the frame's font,
but record the fact that we couldn't load it in
S->font_not_found_p so that we can draw rectangles for the
characters of the glyph string. */
if (s->font == NULL || glyph_not_available_p)
{
s->font_not_found_p = 1;
s->font = FRAME_FONT (s->f);
}
/* Adjust base line for subscript/superscript text. */
s->ybase += voffset;
xassert (s->face && s->face->gc);
return glyph - s->row->glyphs[s->area];
}
/* Fill glyph string S from image glyph S->first_glyph. */
static void
fill_image_glyph_string (s)
struct glyph_string *s;
{
xassert (s->first_glyph->type == IMAGE_GLYPH);
s->img = IMAGE_FROM_ID (s->f, s->first_glyph->u.img_id);
xassert (s->img);
s->slice = s->first_glyph->slice;
s->face = FACE_FROM_ID (s->f, s->first_glyph->face_id);
s->font = s->face->font;
s->width = s->first_glyph->pixel_width;
/* Adjust base line for subscript/superscript text. */
s->ybase += s->first_glyph->voffset;
}
/* Fill glyph string S from a sequence of stretch glyphs.
ROW is the glyph row in which the glyphs are found, AREA is the
area within the row. START is the index of the first glyph to
consider, END is the index of the last + 1.
Value is the index of the first glyph not in S. */
static int
fill_stretch_glyph_string (s, row, area, start, end)
struct glyph_string *s;
struct glyph_row *row;
enum glyph_row_area area;
int start, end;
{
struct glyph *glyph, *last;
int voffset, face_id;
xassert (s->first_glyph->type == STRETCH_GLYPH);
glyph = s->row->glyphs[s->area] + start;
last = s->row->glyphs[s->area] + end;
face_id = glyph->face_id;
s->face = FACE_FROM_ID (s->f, face_id);
s->font = s->face->font;
s->width = glyph->pixel_width;
s->nchars = 1;
voffset = glyph->voffset;
for (++glyph;
(glyph < last
&& glyph->type == STRETCH_GLYPH
&& glyph->voffset == voffset
&& glyph->face_id == face_id);
++glyph)
s->width += glyph->pixel_width;
/* Adjust base line for subscript/superscript text. */
s->ybase += voffset;
/* The case that face->gc == 0 is handled when drawing the glyph
string by calling PREPARE_FACE_FOR_DISPLAY. */
xassert (s->face);
return glyph - s->row->glyphs[s->area];
}
static struct font_metrics *
get_per_char_metric (f, font, char2b)
struct frame *f;
struct font *font;
XChar2b *char2b;
{
static struct font_metrics metrics;
unsigned code = (XCHAR2B_BYTE1 (char2b) << 8) | XCHAR2B_BYTE2 (char2b);
if (! font || code == FONT_INVALID_CODE)
return NULL;
font->driver->text_extents (font, &code, 1, &metrics);
return &metrics;
}
/* EXPORT for RIF:
Set *LEFT and *RIGHT to the left and right overhang of GLYPH on
frame F. Overhangs of glyphs other than type CHAR_GLYPH are
assumed to be zero. */
void
x_get_glyph_overhangs (glyph, f, left, right)
struct glyph *glyph;
struct frame *f;
int *left, *right;
{
*left = *right = 0;
if (glyph->type == CHAR_GLYPH)
{
struct face *face;
XChar2b char2b;
struct font_metrics *pcm;
face = get_glyph_face_and_encoding (f, glyph, &char2b, NULL);
if (face->font && (pcm = get_per_char_metric (f, face->font, &char2b)))
{
if (pcm->rbearing > pcm->width)
*right = pcm->rbearing - pcm->width;
if (pcm->lbearing < 0)
*left = -pcm->lbearing;
}
}
else if (glyph->type == COMPOSITE_GLYPH)
{
if (! glyph->u.cmp.automatic)
{
struct composition *cmp = composition_table[glyph->u.cmp.id];
if (cmp->rbearing > cmp->pixel_width)
*right = cmp->rbearing - cmp->pixel_width;
if (cmp->lbearing < 0)
*left = - cmp->lbearing;
}
else
{
Lisp_Object gstring = composition_gstring_from_id (glyph->u.cmp.id);
struct font_metrics metrics;
composition_gstring_width (gstring, glyph->u.cmp.from,
glyph->u.cmp.to + 1, &metrics);
if (metrics.rbearing > metrics.width)
*right = metrics.rbearing - metrics.width;
if (metrics.lbearing < 0)
*left = - metrics.lbearing;
}
}
}
/* Return the index of the first glyph preceding glyph string S that
is overwritten by S because of S's left overhang. Value is -1
if no glyphs are overwritten. */
static int
left_overwritten (s)
struct glyph_string *s;
{
int k;
if (s->left_overhang)
{
int x = 0, i;
struct glyph *glyphs = s->row->glyphs[s->area];
int first = s->first_glyph - glyphs;
for (i = first - 1; i >= 0 && x > -s->left_overhang; --i)
x -= glyphs[i].pixel_width;
k = i + 1;
}
else
k = -1;
return k;
}
/* Return the index of the first glyph preceding glyph string S that
is overwriting S because of its right overhang. Value is -1 if no
glyph in front of S overwrites S. */
static int
left_overwriting (s)
struct glyph_string *s;
{
int i, k, x;
struct glyph *glyphs = s->row->glyphs[s->area];
int first = s->first_glyph - glyphs;
k = -1;
x = 0;
for (i = first - 1; i >= 0; --i)
{
int left, right;
x_get_glyph_overhangs (glyphs + i, s->f, &left, &right);
if (x + right > 0)
k = i;
x -= glyphs[i].pixel_width;
}
return k;
}
/* Return the index of the last glyph following glyph string S that is
overwritten by S because of S's right overhang. Value is -1 if
no such glyph is found. */
static int
right_overwritten (s)
struct glyph_string *s;
{
int k = -1;
if (s->right_overhang)
{
int x = 0, i;
struct glyph *glyphs = s->row->glyphs[s->area];
int first = (s->first_glyph - glyphs) + (s->cmp ? 1 : s->nchars);
int end = s->row->used[s->area];
for (i = first; i < end && s->right_overhang > x; ++i)
x += glyphs[i].pixel_width;
k = i;
}
return k;
}
/* Return the index of the last glyph following glyph string S that
overwrites S because of its left overhang. Value is negative
if no such glyph is found. */
static int
right_overwriting (s)
struct glyph_string *s;
{
int i, k, x;
int end = s->row->used[s->area];
struct glyph *glyphs = s->row->glyphs[s->area];
int first = (s->first_glyph - glyphs) + (s->cmp ? 1 : s->nchars);
k = -1;
x = 0;
for (i = first; i < end; ++i)
{
int left, right;
x_get_glyph_overhangs (glyphs + i, s->f, &left, &right);
if (x - left < 0)
k = i;
x += glyphs[i].pixel_width;
}
return k;
}
/* Set background width of glyph string S. START is the index of the
first glyph following S. LAST_X is the right-most x-position + 1
in the drawing area. */
static INLINE void
set_glyph_string_background_width (s, start, last_x)
struct glyph_string *s;
int start;
int last_x;
{
/* If the face of this glyph string has to be drawn to the end of
the drawing area, set S->extends_to_end_of_line_p. */
if (start == s->row->used[s->area]
&& s->area == TEXT_AREA
&& ((s->row->fill_line_p
&& (s->hl == DRAW_NORMAL_TEXT
|| s->hl == DRAW_IMAGE_RAISED
|| s->hl == DRAW_IMAGE_SUNKEN))
|| s->hl == DRAW_MOUSE_FACE))
s->extends_to_end_of_line_p = 1;
/* If S extends its face to the end of the line, set its
background_width to the distance to the right edge of the drawing
area. */
if (s->extends_to_end_of_line_p)
s->background_width = last_x - s->x + 1;
else
s->background_width = s->width;
}
/* Compute overhangs and x-positions for glyph string S and its
predecessors, or successors. X is the starting x-position for S.
BACKWARD_P non-zero means process predecessors. */
static void
compute_overhangs_and_x (s, x, backward_p)
struct glyph_string *s;
int x;
int backward_p;
{
if (backward_p)
{
while (s)
{
if (FRAME_RIF (s->f)->compute_glyph_string_overhangs)
FRAME_RIF (s->f)->compute_glyph_string_overhangs (s);
x -= s->width;
s->x = x;
s = s->prev;
}
}
else
{
while (s)
{
if (FRAME_RIF (s->f)->compute_glyph_string_overhangs)
FRAME_RIF (s->f)->compute_glyph_string_overhangs (s);
s->x = x;
x += s->width;
s = s->next;
}
}
}
/* The following macros are only called from draw_glyphs below.
They reference the following parameters of that function directly:
`w', `row', `area', and `overlap_p'
as well as the following local variables:
`s', `f', and `hdc' (in W32) */
#ifdef HAVE_NTGUI
/* On W32, silently add local `hdc' variable to argument list of
init_glyph_string. */
#define INIT_GLYPH_STRING(s, char2b, w, row, area, start, hl) \
init_glyph_string (s, hdc, char2b, w, row, area, start, hl)
#else
#define INIT_GLYPH_STRING(s, char2b, w, row, area, start, hl) \
init_glyph_string (s, char2b, w, row, area, start, hl)
#endif
/* Add a glyph string for a stretch glyph to the list of strings
between HEAD and TAIL. START is the index of the stretch glyph in
row area AREA of glyph row ROW. END is the index of the last glyph
in that glyph row area. X is the current output position assigned
to the new glyph string constructed. HL overrides that face of the
glyph; e.g. it is DRAW_CURSOR if a cursor has to be drawn. LAST_X
is the right-most x-position of the drawing area. */
/* SunOS 4 bundled cc, barfed on continuations in the arg lists here
and below -- keep them on one line. */
#define BUILD_STRETCH_GLYPH_STRING(START, END, HEAD, TAIL, HL, X, LAST_X) \
do \
{ \
s = (struct glyph_string *) alloca (sizeof *s); \
INIT_GLYPH_STRING (s, NULL, w, row, area, START, HL); \
START = fill_stretch_glyph_string (s, row, area, START, END); \
append_glyph_string (&HEAD, &TAIL, s); \
s->x = (X); \
} \
while (0)
/* Add a glyph string for an image glyph to the list of strings
between HEAD and TAIL. START is the index of the image glyph in
row area AREA of glyph row ROW. END is the index of the last glyph
in that glyph row area. X is the current output position assigned
to the new glyph string constructed. HL overrides that face of the
glyph; e.g. it is DRAW_CURSOR if a cursor has to be drawn. LAST_X
is the right-most x-position of the drawing area. */
#define BUILD_IMAGE_GLYPH_STRING(START, END, HEAD, TAIL, HL, X, LAST_X) \
do \
{ \
s = (struct glyph_string *) alloca (sizeof *s); \
INIT_GLYPH_STRING (s, NULL, w, row, area, START, HL); \
fill_image_glyph_string (s); \
append_glyph_string (&HEAD, &TAIL, s); \
++START; \
s->x = (X); \
} \
while (0)
/* Add a glyph string for a sequence of character glyphs to the list
of strings between HEAD and TAIL. START is the index of the first
glyph in row area AREA of glyph row ROW that is part of the new
glyph string. END is the index of the last glyph in that glyph row
area. X is the current output position assigned to the new glyph
string constructed. HL overrides that face of the glyph; e.g. it
is DRAW_CURSOR if a cursor has to be drawn. LAST_X is the
right-most x-position of the drawing area. */
#define BUILD_CHAR_GLYPH_STRINGS(START, END, HEAD, TAIL, HL, X, LAST_X) \
do \
{ \
int face_id; \
XChar2b *char2b; \
\
face_id = (row)->glyphs[area][START].face_id; \
\
s = (struct glyph_string *) alloca (sizeof *s); \
char2b = (XChar2b *) alloca ((END - START) * sizeof *char2b); \
INIT_GLYPH_STRING (s, char2b, w, row, area, START, HL); \
append_glyph_string (&HEAD, &TAIL, s); \
s->x = (X); \
START = fill_glyph_string (s, face_id, START, END, overlaps); \
} \
while (0)
/* Add a glyph string for a composite sequence to the list of strings
between HEAD and TAIL. START is the index of the first glyph in
row area AREA of glyph row ROW that is part of the new glyph
string. END is the index of the last glyph in that glyph row area.
X is the current output position assigned to the new glyph string
constructed. HL overrides that face of the glyph; e.g. it is
DRAW_CURSOR if a cursor has to be drawn. LAST_X is the right-most
x-position of the drawing area. */
#define BUILD_COMPOSITE_GLYPH_STRING(START, END, HEAD, TAIL, HL, X, LAST_X) \
do { \
int face_id = (row)->glyphs[area][START].face_id; \
struct face *base_face = FACE_FROM_ID (f, face_id); \
int cmp_id = (row)->glyphs[area][START].u.cmp.id; \
struct composition *cmp = composition_table[cmp_id]; \
XChar2b *char2b; \
struct glyph_string *first_s; \
int n; \
\
char2b = (XChar2b *) alloca ((sizeof *char2b) * cmp->glyph_len); \
\
/* Make glyph_strings for each glyph sequence that is drawable by \
the same face, and append them to HEAD/TAIL. */ \
for (n = 0; n < cmp->glyph_len;) \
{ \
s = (struct glyph_string *) alloca (sizeof *s); \
INIT_GLYPH_STRING (s, char2b, w, row, area, START, HL); \
append_glyph_string (&(HEAD), &(TAIL), s); \
s->cmp = cmp; \
s->cmp_from = n; \
s->x = (X); \
if (n == 0) \
first_s = s; \
n = fill_composite_glyph_string (s, base_face, overlaps); \
} \
\
++START; \
s = first_s; \
} while (0)
/* Add a glyph string for a glyph-string sequence to the list of strings
between HEAD and TAIL. */
#define BUILD_GSTRING_GLYPH_STRING(START, END, HEAD, TAIL, HL, X, LAST_X) \
do { \
int face_id; \
XChar2b *char2b; \
Lisp_Object gstring; \
\
face_id = (row)->glyphs[area][START].face_id; \
gstring = (composition_gstring_from_id \
((row)->glyphs[area][START].u.cmp.id)); \
s = (struct glyph_string *) alloca (sizeof *s); \
char2b = (XChar2b *) alloca ((sizeof *char2b) \
* LGSTRING_GLYPH_LEN (gstring)); \
INIT_GLYPH_STRING (s, char2b, w, row, area, START, HL); \
append_glyph_string (&(HEAD), &(TAIL), s); \
s->x = (X); \
START = fill_gstring_glyph_string (s, face_id, START, END, overlaps); \
} while (0)
/* Build a list of glyph strings between HEAD and TAIL for the glyphs
of AREA of glyph row ROW on window W between indices START and END.
HL overrides the face for drawing glyph strings, e.g. it is
DRAW_CURSOR to draw a cursor. X and LAST_X are start and end
x-positions of the drawing area.
This is an ugly monster macro construct because we must use alloca
to allocate glyph strings (because draw_glyphs can be called
asynchronously). */
#define BUILD_GLYPH_STRINGS(START, END, HEAD, TAIL, HL, X, LAST_X) \
do \
{ \
HEAD = TAIL = NULL; \
while (START < END) \
{ \
struct glyph *first_glyph = (row)->glyphs[area] + START; \
switch (first_glyph->type) \
{ \
case CHAR_GLYPH: \
BUILD_CHAR_GLYPH_STRINGS (START, END, HEAD, TAIL, \
HL, X, LAST_X); \
break; \
\
case COMPOSITE_GLYPH: \
if (first_glyph->u.cmp.automatic) \
BUILD_GSTRING_GLYPH_STRING (START, END, HEAD, TAIL, \
HL, X, LAST_X); \
else \
BUILD_COMPOSITE_GLYPH_STRING (START, END, HEAD, TAIL, \
HL, X, LAST_X); \
break; \
\
case STRETCH_GLYPH: \
BUILD_STRETCH_GLYPH_STRING (START, END, HEAD, TAIL, \
HL, X, LAST_X); \
break; \
\
case IMAGE_GLYPH: \
BUILD_IMAGE_GLYPH_STRING (START, END, HEAD, TAIL, \
HL, X, LAST_X); \
break; \
\
default: \
abort (); \
} \
\
if (s) \
{ \
set_glyph_string_background_width (s, START, LAST_X); \
(X) += s->width; \
} \
} \
} while (0)
/* Draw glyphs between START and END in AREA of ROW on window W,
starting at x-position X. X is relative to AREA in W. HL is a
face-override with the following meaning:
DRAW_NORMAL_TEXT draw normally
DRAW_CURSOR draw in cursor face
DRAW_MOUSE_FACE draw in mouse face.
DRAW_INVERSE_VIDEO draw in mode line face
DRAW_IMAGE_SUNKEN draw an image with a sunken relief around it
DRAW_IMAGE_RAISED draw an image with a raised relief around it
If OVERLAPS is non-zero, draw only the foreground of characters and
clip to the physical height of ROW. Non-zero value also defines
the overlapping part to be drawn:
OVERLAPS_PRED overlap with preceding rows
OVERLAPS_SUCC overlap with succeeding rows
OVERLAPS_BOTH overlap with both preceding/succeeding rows
OVERLAPS_ERASED_CURSOR overlap with erased cursor area
Value is the x-position reached, relative to AREA of W. */
static int
draw_glyphs (w, x, row, area, start, end, hl, overlaps)
struct window *w;
int x;
struct glyph_row *row;
enum glyph_row_area area;
EMACS_INT start, end;
enum draw_glyphs_face hl;
int overlaps;
{
struct glyph_string *head, *tail;
struct glyph_string *s;
struct glyph_string *clip_head = NULL, *clip_tail = NULL;
int i, j, x_reached, last_x, area_left = 0;
struct frame *f = XFRAME (WINDOW_FRAME (w));
DECLARE_HDC (hdc);
ALLOCATE_HDC (hdc, f);
/* Let's rather be paranoid than getting a SEGV. */
end = min (end, row->used[area]);
start = max (0, start);
start = min (end, start);
/* Translate X to frame coordinates. Set last_x to the right
end of the drawing area. */
if (row->full_width_p)
{
/* X is relative to the left edge of W, without scroll bars
or fringes. */
area_left = WINDOW_LEFT_EDGE_X (w);
last_x = WINDOW_LEFT_EDGE_X (w) + WINDOW_TOTAL_WIDTH (w);
}
else
{
area_left = window_box_left (w, area);
last_x = area_left + window_box_width (w, area);
}
x += area_left;
/* Build a doubly-linked list of glyph_string structures between
head and tail from what we have to draw. Note that the macro
BUILD_GLYPH_STRINGS will modify its start parameter. That's
the reason we use a separate variable `i'. */
i = start;
BUILD_GLYPH_STRINGS (i, end, head, tail, hl, x, last_x);
if (tail)
x_reached = tail->x + tail->background_width;
else
x_reached = x;
/* If there are any glyphs with lbearing < 0 or rbearing > width in
the row, redraw some glyphs in front or following the glyph
strings built above. */
if (head && !overlaps && row->contains_overlapping_glyphs_p)
{
struct glyph_string *h, *t;
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
int mouse_beg_col, mouse_end_col, check_mouse_face = 0;
int dummy_x = 0;
/* If mouse highlighting is on, we may need to draw adjacent
glyphs using mouse-face highlighting. */
if (area == TEXT_AREA && row->mouse_face_p)
{
struct glyph_row *mouse_beg_row, *mouse_end_row;
mouse_beg_row = MATRIX_ROW (w->current_matrix, dpyinfo->mouse_face_beg_row);
mouse_end_row = MATRIX_ROW (w->current_matrix, dpyinfo->mouse_face_end_row);
if (row >= mouse_beg_row && row <= mouse_end_row)
{
check_mouse_face = 1;
mouse_beg_col = (row == mouse_beg_row)
? dpyinfo->mouse_face_beg_col : 0;
mouse_end_col = (row == mouse_end_row)
? dpyinfo->mouse_face_end_col
: row->used[TEXT_AREA];
}
}
/* Compute overhangs for all glyph strings. */
if (FRAME_RIF (f)->compute_glyph_string_overhangs)
for (s = head; s; s = s->next)
FRAME_RIF (f)->compute_glyph_string_overhangs (s);
/* Prepend glyph strings for glyphs in front of the first glyph
string that are overwritten because of the first glyph
string's left overhang. The background of all strings
prepended must be drawn because the first glyph string
draws over it. */
i = left_overwritten (head);
if (i >= 0)
{
enum draw_glyphs_face overlap_hl;
/* If this row contains mouse highlighting, attempt to draw
the overlapped glyphs with the correct highlight. This
code fails if the overlap encompasses more than one glyph
and mouse-highlight spans only some of these glyphs.
However, making it work perfectly involves a lot more
code, and I don't know if the pathological case occurs in
practice, so we'll stick to this for now. --- cyd */
if (check_mouse_face
&& mouse_beg_col < start && mouse_end_col > i)
overlap_hl = DRAW_MOUSE_FACE;
else
overlap_hl = DRAW_NORMAL_TEXT;
j = i;
BUILD_GLYPH_STRINGS (j, start, h, t,
overlap_hl, dummy_x, last_x);
start = i;
compute_overhangs_and_x (t, head->x, 1);
prepend_glyph_string_lists (&head, &tail, h, t);
clip_head = head;
}
/* Prepend glyph strings for glyphs in front of the first glyph
string that overwrite that glyph string because of their
right overhang. For these strings, only the foreground must
be drawn, because it draws over the glyph string at `head'.
The background must not be drawn because this would overwrite
right overhangs of preceding glyphs for which no glyph
strings exist. */
i = left_overwriting (head);
if (i >= 0)
{
enum draw_glyphs_face overlap_hl;
if (check_mouse_face
&& mouse_beg_col < start && mouse_end_col > i)
overlap_hl = DRAW_MOUSE_FACE;
else
overlap_hl = DRAW_NORMAL_TEXT;
clip_head = head;
BUILD_GLYPH_STRINGS (i, start, h, t,
overlap_hl, dummy_x, last_x);
for (s = h; s; s = s->next)
s->background_filled_p = 1;
compute_overhangs_and_x (t, head->x, 1);
prepend_glyph_string_lists (&head, &tail, h, t);
}
/* Append glyphs strings for glyphs following the last glyph
string tail that are overwritten by tail. The background of
these strings has to be drawn because tail's foreground draws
over it. */
i = right_overwritten (tail);
if (i >= 0)
{
enum draw_glyphs_face overlap_hl;
if (check_mouse_face
&& mouse_beg_col < i && mouse_end_col > end)
overlap_hl = DRAW_MOUSE_FACE;
else
overlap_hl = DRAW_NORMAL_TEXT;
BUILD_GLYPH_STRINGS (end, i, h, t,
overlap_hl, x, last_x);
/* Because BUILD_GLYPH_STRINGS updates the first argument,
we don't have `end = i;' here. */
compute_overhangs_and_x (h, tail->x + tail->width, 0);
append_glyph_string_lists (&head, &tail, h, t);
clip_tail = tail;
}
/* Append glyph strings for glyphs following the last glyph
string tail that overwrite tail. The foreground of such
glyphs has to be drawn because it writes into the background
of tail. The background must not be drawn because it could
paint over the foreground of following glyphs. */
i = right_overwriting (tail);
if (i >= 0)
{
enum draw_glyphs_face overlap_hl;
if (check_mouse_face
&& mouse_beg_col < i && mouse_end_col > end)
overlap_hl = DRAW_MOUSE_FACE;
else
overlap_hl = DRAW_NORMAL_TEXT;
clip_tail = tail;
i++; /* We must include the Ith glyph. */
BUILD_GLYPH_STRINGS (end, i, h, t,
overlap_hl, x, last_x);
for (s = h; s; s = s->next)
s->background_filled_p = 1;
compute_overhangs_and_x (h, tail->x + tail->width, 0);
append_glyph_string_lists (&head, &tail, h, t);
}
if (clip_head || clip_tail)
for (s = head; s; s = s->next)
{
s->clip_head = clip_head;
s->clip_tail = clip_tail;
}
}
/* Draw all strings. */
for (s = head; s; s = s->next)
FRAME_RIF (f)->draw_glyph_string (s);
#ifndef HAVE_NS
/* When focus a sole frame and move horizontally, this sets on_p to 0
causing a failure to erase prev cursor position. */
if (area == TEXT_AREA
&& !row->full_width_p
/* When drawing overlapping rows, only the glyph strings'
foreground is drawn, which doesn't erase a cursor
completely. */
&& !overlaps)
{
int x0 = clip_head ? clip_head->x : (head ? head->x : x);
int x1 = (clip_tail ? clip_tail->x + clip_tail->background_width
: (tail ? tail->x + tail->background_width : x));
x0 -= area_left;
x1 -= area_left;
notice_overwritten_cursor (w, TEXT_AREA, x0, x1,
row->y, MATRIX_ROW_BOTTOM_Y (row));
}
#endif
/* Value is the x-position up to which drawn, relative to AREA of W.
This doesn't include parts drawn because of overhangs. */
if (row->full_width_p)
x_reached = FRAME_TO_WINDOW_PIXEL_X (w, x_reached);
else
x_reached -= area_left;
RELEASE_HDC (hdc, f);
return x_reached;
}
/* Expand row matrix if too narrow. Don't expand if area
is not present. */
#define IT_EXPAND_MATRIX_WIDTH(it, area) \
{ \
if (!fonts_changed_p \
&& (it->glyph_row->glyphs[area] \
< it->glyph_row->glyphs[area + 1])) \
{ \
it->w->ncols_scale_factor++; \
fonts_changed_p = 1; \
} \
}
/* Store one glyph for IT->char_to_display in IT->glyph_row.
Called from x_produce_glyphs when IT->glyph_row is non-null. */
static INLINE void
append_glyph (it)
struct it *it;
{
struct glyph *glyph;
enum glyph_row_area area = it->area;
xassert (it->glyph_row);
xassert (it->char_to_display != '\n' && it->char_to_display != '\t');
glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
if (glyph < it->glyph_row->glyphs[area + 1])
{
glyph->charpos = CHARPOS (it->position);
glyph->object = it->object;
if (it->pixel_width > 0)
{
glyph->pixel_width = it->pixel_width;
glyph->padding_p = 0;
}
else
{
/* Assure at least 1-pixel width. Otherwise, cursor can't
be displayed correctly. */
glyph->pixel_width = 1;
glyph->padding_p = 1;
}
glyph->ascent = it->ascent;
glyph->descent = it->descent;
glyph->voffset = it->voffset;
glyph->type = CHAR_GLYPH;
glyph->avoid_cursor_p = it->avoid_cursor_p;
glyph->multibyte_p = it->multibyte_p;
glyph->left_box_line_p = it->start_of_box_run_p;
glyph->right_box_line_p = it->end_of_box_run_p;
glyph->overlaps_vertically_p = (it->phys_ascent > it->ascent
|| it->phys_descent > it->descent);
glyph->glyph_not_available_p = it->glyph_not_available_p;
glyph->face_id = it->face_id;
glyph->u.ch = it->char_to_display;
glyph->slice = null_glyph_slice;
glyph->font_type = FONT_TYPE_UNKNOWN;
++it->glyph_row->used[area];
}
else
IT_EXPAND_MATRIX_WIDTH (it, area);
}
/* Store one glyph for the composition IT->cmp_it.id in
IT->glyph_row. Called from x_produce_glyphs when IT->glyph_row is
non-null. */
static INLINE void
append_composite_glyph (it)
struct it *it;
{
struct glyph *glyph;
enum glyph_row_area area = it->area;
xassert (it->glyph_row);
glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
if (glyph < it->glyph_row->glyphs[area + 1])
{
glyph->charpos = CHARPOS (it->position);
glyph->object = it->object;
glyph->pixel_width = it->pixel_width;
glyph->ascent = it->ascent;
glyph->descent = it->descent;
glyph->voffset = it->voffset;
glyph->type = COMPOSITE_GLYPH;
if (it->cmp_it.ch < 0)
{
glyph->u.cmp.automatic = 0;
glyph->u.cmp.id = it->cmp_it.id;
}
else
{
glyph->u.cmp.automatic = 1;
glyph->u.cmp.id = it->cmp_it.id;
glyph->u.cmp.from = it->cmp_it.from;
glyph->u.cmp.to = it->cmp_it.to - 1;
}
glyph->avoid_cursor_p = it->avoid_cursor_p;
glyph->multibyte_p = it->multibyte_p;
glyph->left_box_line_p = it->start_of_box_run_p;
glyph->right_box_line_p = it->end_of_box_run_p;
glyph->overlaps_vertically_p = (it->phys_ascent > it->ascent
|| it->phys_descent > it->descent);
glyph->padding_p = 0;
glyph->glyph_not_available_p = 0;
glyph->face_id = it->face_id;
glyph->slice = null_glyph_slice;
glyph->font_type = FONT_TYPE_UNKNOWN;
++it->glyph_row->used[area];
}
else
IT_EXPAND_MATRIX_WIDTH (it, area);
}
/* Change IT->ascent and IT->height according to the setting of
IT->voffset. */
static INLINE void
take_vertical_position_into_account (it)
struct it *it;
{
if (it->voffset)
{
if (it->voffset < 0)
/* Increase the ascent so that we can display the text higher
in the line. */
it->ascent -= it->voffset;
else
/* Increase the descent so that we can display the text lower
in the line. */
it->descent += it->voffset;
}
}
/* Produce glyphs/get display metrics for the image IT is loaded with.
See the description of struct display_iterator in dispextern.h for
an overview of struct display_iterator. */
static void
produce_image_glyph (it)
struct it *it;
{
struct image *img;
struct face *face;
int glyph_ascent, crop;
struct glyph_slice slice;
xassert (it->what == IT_IMAGE);
face = FACE_FROM_ID (it->f, it->face_id);
xassert (face);
/* Make sure X resources of the face is loaded. */
PREPARE_FACE_FOR_DISPLAY (it->f, face);
if (it->image_id < 0)
{
/* Fringe bitmap. */
it->ascent = it->phys_ascent = 0;
it->descent = it->phys_descent = 0;
it->pixel_width = 0;
it->nglyphs = 0;
return;
}
img = IMAGE_FROM_ID (it->f, it->image_id);
xassert (img);
/* Make sure X resources of the image is loaded. */
prepare_image_for_display (it->f, img);
slice.x = slice.y = 0;
slice.width = img->width;
slice.height = img->height;
if (INTEGERP (it->slice.x))
slice.x = XINT (it->slice.x);
else if (FLOATP (it->slice.x))
slice.x = XFLOAT_DATA (it->slice.x) * img->width;
if (INTEGERP (it->slice.y))
slice.y = XINT (it->slice.y);
else if (FLOATP (it->slice.y))
slice.y = XFLOAT_DATA (it->slice.y) * img->height;
if (INTEGERP (it->slice.width))
slice.width = XINT (it->slice.width);
else if (FLOATP (it->slice.width))
slice.width = XFLOAT_DATA (it->slice.width) * img->width;
if (INTEGERP (it->slice.height))
slice.height = XINT (it->slice.height);
else if (FLOATP (it->slice.height))
slice.height = XFLOAT_DATA (it->slice.height) * img->height;
if (slice.x >= img->width)
slice.x = img->width;
if (slice.y >= img->height)
slice.y = img->height;
if (slice.x + slice.width >= img->width)
slice.width = img->width - slice.x;
if (slice.y + slice.height > img->height)
slice.height = img->height - slice.y;
if (slice.width == 0 || slice.height == 0)
return;
it->ascent = it->phys_ascent = glyph_ascent = image_ascent (img, face, &slice);
it->descent = slice.height - glyph_ascent;
if (slice.y == 0)
it->descent += img->vmargin;
if (slice.y + slice.height == img->height)
it->descent += img->vmargin;
it->phys_descent = it->descent;
it->pixel_width = slice.width;
if (slice.x == 0)
it->pixel_width += img->hmargin;
if (slice.x + slice.width == img->width)
it->pixel_width += img->hmargin;
/* It's quite possible for images to have an ascent greater than
their height, so don't get confused in that case. */
if (it->descent < 0)
it->descent = 0;
it->nglyphs = 1;
if (face->box != FACE_NO_BOX)
{
if (face->box_line_width > 0)
{
if (slice.y == 0)
it->ascent += face->box_line_width;
if (slice.y + slice.height == img->height)
it->descent += face->box_line_width;
}
if (it->start_of_box_run_p && slice.x == 0)
it->pixel_width += eabs (face->box_line_width);
if (it->end_of_box_run_p && slice.x + slice.width == img->width)
it->pixel_width += eabs (face->box_line_width);
}
take_vertical_position_into_account (it);
/* Automatically crop wide image glyphs at right edge so we can
draw the cursor on same display row. */
if ((crop = it->pixel_width - (it->last_visible_x - it->current_x), crop > 0)
&& (it->hpos == 0 || it->pixel_width > it->last_visible_x / 4))
{
it->pixel_width -= crop;
slice.width -= crop;
}
if (it->glyph_row)
{
struct glyph *glyph;
enum glyph_row_area area = it->area;
glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
if (glyph < it->glyph_row->glyphs[area + 1])
{
glyph->charpos = CHARPOS (it->position);
glyph->object = it->object;
glyph->pixel_width = it->pixel_width;
glyph->ascent = glyph_ascent;
glyph->descent = it->descent;
glyph->voffset = it->voffset;
glyph->type = IMAGE_GLYPH;
glyph->avoid_cursor_p = it->avoid_cursor_p;
glyph->multibyte_p = it->multibyte_p;
glyph->left_box_line_p = it->start_of_box_run_p;
glyph->right_box_line_p = it->end_of_box_run_p;
glyph->overlaps_vertically_p = 0;
glyph->padding_p = 0;
glyph->glyph_not_available_p = 0;
glyph->face_id = it->face_id;
glyph->u.img_id = img->id;
glyph->slice = slice;
glyph->font_type = FONT_TYPE_UNKNOWN;
++it->glyph_row->used[area];
}
else
IT_EXPAND_MATRIX_WIDTH (it, area);
}
}
/* Append a stretch glyph to IT->glyph_row. OBJECT is the source
of the glyph, WIDTH and HEIGHT are the width and height of the
stretch. ASCENT is the ascent of the glyph (0 <= ASCENT <= HEIGHT). */
static void
append_stretch_glyph (it, object, width, height, ascent)
struct it *it;
Lisp_Object object;
int width, height;
int ascent;
{
struct glyph *glyph;
enum glyph_row_area area = it->area;
xassert (ascent >= 0 && ascent <= height);
glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
if (glyph < it->glyph_row->glyphs[area + 1])
{
glyph->charpos = CHARPOS (it->position);
glyph->object = object;
glyph->pixel_width = width;
glyph->ascent = ascent;
glyph->descent = height - ascent;
glyph->voffset = it->voffset;
glyph->type = STRETCH_GLYPH;
glyph->avoid_cursor_p = it->avoid_cursor_p;
glyph->multibyte_p = it->multibyte_p;
glyph->left_box_line_p = it->start_of_box_run_p;
glyph->right_box_line_p = it->end_of_box_run_p;
glyph->overlaps_vertically_p = 0;
glyph->padding_p = 0;
glyph->glyph_not_available_p = 0;
glyph->face_id = it->face_id;
glyph->u.stretch.ascent = ascent;
glyph->u.stretch.height = height;
glyph->slice = null_glyph_slice;
glyph->font_type = FONT_TYPE_UNKNOWN;
++it->glyph_row->used[area];
}
else
IT_EXPAND_MATRIX_WIDTH (it, area);
}
/* Produce a stretch glyph for iterator IT. IT->object is the value
of the glyph property displayed. The value must be a list
`(space KEYWORD VALUE ...)' with the following KEYWORD/VALUE pairs
being recognized:
1. `:width WIDTH' specifies that the space should be WIDTH *
canonical char width wide. WIDTH may be an integer or floating
point number.
2. `:relative-width FACTOR' specifies that the width of the stretch
should be computed from the width of the first character having the
`glyph' property, and should be FACTOR times that width.
3. `:align-to HPOS' specifies that the space should be wide enough
to reach HPOS, a value in canonical character units.
Exactly one of the above pairs must be present.
4. `:height HEIGHT' specifies that the height of the stretch produced
should be HEIGHT, measured in canonical character units.
5. `:relative-height FACTOR' specifies that the height of the
stretch should be FACTOR times the height of the characters having
the glyph property.
Either none or exactly one of 4 or 5 must be present.
6. `:ascent ASCENT' specifies that ASCENT percent of the height
of the stretch should be used for the ascent of the stretch.
ASCENT must be in the range 0 <= ASCENT <= 100. */
static void
produce_stretch_glyph (it)
struct it *it;
{
/* (space :width WIDTH :height HEIGHT ...) */
Lisp_Object prop, plist;
int width = 0, height = 0, align_to = -1;
int zero_width_ok_p = 0, zero_height_ok_p = 0;
int ascent = 0;
double tem;
struct face *face = FACE_FROM_ID (it->f, it->face_id);
struct font *font = face->font ? face->font : FRAME_FONT (it->f);
PREPARE_FACE_FOR_DISPLAY (it->f, face);
/* List should start with `space'. */
xassert (CONSP (it->object) && EQ (XCAR (it->object), Qspace));
plist = XCDR (it->object);
/* Compute the width of the stretch. */
if ((prop = Fplist_get (plist, QCwidth), !NILP (prop))
&& calc_pixel_width_or_height (&tem, it, prop, font, 1, 0))
{
/* Absolute width `:width WIDTH' specified and valid. */
zero_width_ok_p = 1;
width = (int)tem;
}
else if (prop = Fplist_get (plist, QCrelative_width),
NUMVAL (prop) > 0)
{
/* Relative width `:relative-width FACTOR' specified and valid.
Compute the width of the characters having the `glyph'
property. */
struct it it2;
unsigned char *p = BYTE_POS_ADDR (IT_BYTEPOS (*it));
it2 = *it;
if (it->multibyte_p)
{
int maxlen = ((IT_BYTEPOS (*it) >= GPT ? ZV : GPT)
- IT_BYTEPOS (*it));
it2.c = STRING_CHAR_AND_LENGTH (p, it2.len);
}
else
it2.c = *p, it2.len = 1;
it2.glyph_row = NULL;
it2.what = IT_CHARACTER;
x_produce_glyphs (&it2);
width = NUMVAL (prop) * it2.pixel_width;
}
else if ((prop = Fplist_get (plist, QCalign_to), !NILP (prop))
&& calc_pixel_width_or_height (&tem, it, prop, font, 1, &align_to))
{
if (it->glyph_row == NULL || !it->glyph_row->mode_line_p)
align_to = (align_to < 0
? 0
: align_to - window_box_left_offset (it->w, TEXT_AREA));
else if (align_to < 0)
align_to = window_box_left_offset (it->w, TEXT_AREA);
width = max (0, (int)tem + align_to - it->current_x);
zero_width_ok_p = 1;
}
else
/* Nothing specified -> width defaults to canonical char width. */
width = FRAME_COLUMN_WIDTH (it->f);
if (width <= 0 && (width < 0 || !zero_width_ok_p))
width = 1;
/* Compute height. */
if ((prop = Fplist_get (plist, QCheight), !NILP (prop))
&& calc_pixel_width_or_height (&tem, it, prop, font, 0, 0))
{
height = (int)tem;
zero_height_ok_p = 1;
}
else if (prop = Fplist_get (plist, QCrelative_height),
NUMVAL (prop) > 0)
height = FONT_HEIGHT (font) * NUMVAL (prop);
else
height = FONT_HEIGHT (font);
if (height <= 0 && (height < 0 || !zero_height_ok_p))
height = 1;
/* Compute percentage of height used for ascent. If
`:ascent ASCENT' is present and valid, use that. Otherwise,
derive the ascent from the font in use. */
if (prop = Fplist_get (plist, QCascent),
NUMVAL (prop) > 0 && NUMVAL (prop) <= 100)
ascent = height * NUMVAL (prop) / 100.0;
else if (!NILP (prop)
&& calc_pixel_width_or_height (&tem, it, prop, font, 0, 0))
ascent = min (max (0, (int)tem), height);
else
ascent = (height * FONT_BASE (font)) / FONT_HEIGHT (font);
if (width > 0 && it->line_wrap != TRUNCATE
&& it->current_x + width > it->last_visible_x)
width = it->last_visible_x - it->current_x - 1;
if (width > 0 && height > 0 && it->glyph_row)
{
Lisp_Object object = it->stack[it->sp - 1].string;
if (!STRINGP (object))
object = it->w->buffer;
append_stretch_glyph (it, object, width, height, ascent);
}
it->pixel_width = width;
it->ascent = it->phys_ascent = ascent;
it->descent = it->phys_descent = height - it->ascent;
it->nglyphs = width > 0 && height > 0 ? 1 : 0;
take_vertical_position_into_account (it);
}
/* Calculate line-height and line-spacing properties.
An integer value specifies explicit pixel value.
A float value specifies relative value to current face height.
A cons (float . face-name) specifies relative value to
height of specified face font.
Returns height in pixels, or nil. */
static Lisp_Object
calc_line_height_property (it, val, font, boff, override)
struct it *it;
Lisp_Object val;
struct font *font;
int boff, override;
{
Lisp_Object face_name = Qnil;
int ascent, descent, height;
if (NILP (val) || INTEGERP (val) || (override && EQ (val, Qt)))
return val;
if (CONSP (val))
{
face_name = XCAR (val);
val = XCDR (val);
if (!NUMBERP (val))
val = make_number (1);
if (NILP (face_name))
{
height = it->ascent + it->descent;
goto scale;
}
}
if (NILP (face_name))
{
font = FRAME_FONT (it->f);
boff = FRAME_BASELINE_OFFSET (it->f);
}
else if (EQ (face_name, Qt))
{
override = 0;
}
else
{
int face_id;
struct face *face;
face_id = lookup_named_face (it->f, face_name, 0);
if (face_id < 0)
return make_number (-1);
face = FACE_FROM_ID (it->f, face_id);
font = face->font;
if (font == NULL)
return make_number (-1);
boff = font->baseline_offset;
if (font->vertical_centering)
boff = VCENTER_BASELINE_OFFSET (font, it->f) - boff;
}
ascent = FONT_BASE (font) + boff;
descent = FONT_DESCENT (font) - boff;
if (override)
{
it->override_ascent = ascent;
it->override_descent = descent;
it->override_boff = boff;
}
height = ascent + descent;
scale:
if (FLOATP (val))
height = (int)(XFLOAT_DATA (val) * height);
else if (INTEGERP (val))
height *= XINT (val);
return make_number (height);
}
/* RIF:
Produce glyphs/get display metrics for the display element IT is
loaded with. See the description of struct it in dispextern.h
for an overview of struct it. */
void
x_produce_glyphs (it)
struct it *it;
{
int extra_line_spacing = it->extra_line_spacing;
it->glyph_not_available_p = 0;
if (it->what == IT_CHARACTER)
{
XChar2b char2b;
struct font *font;
struct face *face = FACE_FROM_ID (it->f, it->face_id);
struct font_metrics *pcm;
int font_not_found_p;
int boff; /* baseline offset */
/* We may change it->multibyte_p upon unibyte<->multibyte
conversion. So, save the current value now and restore it
later.
Note: It seems that we don't have to record multibyte_p in
struct glyph because the character code itself tells whether
or not the character is multibyte. Thus, in the future, we
must consider eliminating the field `multibyte_p' in the
struct glyph. */
int saved_multibyte_p = it->multibyte_p;
/* Maybe translate single-byte characters to multibyte, or the
other way. */
it->char_to_display = it->c;
if (!ASCII_BYTE_P (it->c)
&& ! it->multibyte_p)
{
if (SINGLE_BYTE_CHAR_P (it->c)
&& unibyte_display_via_language_environment)
{
struct charset *unibyte = CHARSET_FROM_ID (charset_unibyte);
/* get_next_display_element assures that this decoding
never fails. */
it->char_to_display = DECODE_CHAR (unibyte, it->c);
it->multibyte_p = 1;
it->face_id = FACE_FOR_CHAR (it->f, face, it->char_to_display,
-1, Qnil);
face = FACE_FROM_ID (it->f, it->face_id);
}
}
/* Get font to use. Encode IT->char_to_display. */
get_char_face_and_encoding (it->f, it->char_to_display, it->face_id,
&char2b, it->multibyte_p, 0);
font = face->font;
font_not_found_p = font == NULL;
if (font_not_found_p)
{
/* When no suitable font found, display an empty box based
on the metrics of the font of the default face (or what
remapped). */
struct face *no_font_face
= FACE_FROM_ID (it->f,
NILP (Vface_remapping_alist) ? DEFAULT_FACE_ID
: lookup_basic_face (it->f, DEFAULT_FACE_ID));
font = no_font_face->font;
boff = font->baseline_offset;
}
else
{
boff = font->baseline_offset;
if (font->vertical_centering)
boff = VCENTER_BASELINE_OFFSET (font, it->f) - boff;
}
if (it->char_to_display >= ' '
&& (!it->multibyte_p || it->char_to_display < 128))
{
/* Either unibyte or ASCII. */
int stretched_p;
it->nglyphs = 1;
pcm = get_per_char_metric (it->f, font, &char2b);
if (it->override_ascent >= 0)
{
it->ascent = it->override_ascent;
it->descent = it->override_descent;
boff = it->override_boff;
}
else
{
it->ascent = FONT_BASE (font) + boff;
it->descent = FONT_DESCENT (font) - boff;
}
if (pcm)
{
it->phys_ascent = pcm->ascent + boff;
it->phys_descent = pcm->descent - boff;
it->pixel_width = pcm->width;
}
else
{
it->glyph_not_available_p = 1;
it->phys_ascent = it->ascent;
it->phys_descent = it->descent;
it->pixel_width = FONT_WIDTH (font);
}
if (it->constrain_row_ascent_descent_p)
{
if (it->descent > it->max_descent)
{
it->ascent += it->descent - it->max_descent;
it->descent = it->max_descent;
}
if (it->ascent > it->max_ascent)
{
it->descent = min (it->max_descent, it->descent + it->ascent - it->max_ascent);
it->ascent = it->max_ascent;
}
it->phys_ascent = min (it->phys_ascent, it->ascent);
it->phys_descent = min (it->phys_descent, it->descent);
extra_line_spacing = 0;
}
/* If this is a space inside a region of text with
`space-width' property, change its width. */
stretched_p = it->char_to_display == ' ' && !NILP (it->space_width);
if (stretched_p)
it->pixel_width *= XFLOATINT (it->space_width);
/* If face has a box, add the box thickness to the character
height. If character has a box line to the left and/or
right, add the box line width to the character's width. */
if (face->box != FACE_NO_BOX)
{
int thick = face->box_line_width;
if (thick > 0)
{
it->ascent += thick;
it->descent += thick;
}
else
thick = -thick;
if (it->start_of_box_run_p)
it->pixel_width += thick;
if (it->end_of_box_run_p)
it->pixel_width += thick;
}
/* If face has an overline, add the height of the overline
(1 pixel) and a 1 pixel margin to the character height. */
if (face->overline_p)
it->ascent += overline_margin;
if (it->constrain_row_ascent_descent_p)
{
if (it->ascent > it->max_ascent)
it->ascent = it->max_ascent;
if (it->descent > it->max_descent)
it->descent = it->max_descent;
}
take_vertical_position_into_account (it);
/* If we have to actually produce glyphs, do it. */
if (it->glyph_row)
{
if (stretched_p)
{
/* Translate a space with a `space-width' property
into a stretch glyph. */
int ascent = (((it->ascent + it->descent) * FONT_BASE (font))
/ FONT_HEIGHT (font));
append_stretch_glyph (it, it->object, it->pixel_width,
it->ascent + it->descent, ascent);
}
else
append_glyph (it);
/* If characters with lbearing or rbearing are displayed
in this line, record that fact in a flag of the
glyph row. This is used to optimize X output code. */
if (pcm && (pcm->lbearing < 0 || pcm->rbearing > pcm->width))
it->glyph_row->contains_overlapping_glyphs_p = 1;
}
if (! stretched_p && it->pixel_width == 0)
/* We assure that all visible glyphs have at least 1-pixel
width. */
it->pixel_width = 1;
}
else if (it->char_to_display == '\n')
{
/* A newline has no width, but we need the height of the
line. But if previous part of the line sets a height,
don't increase that height */
Lisp_Object height;
Lisp_Object total_height = Qnil;
it->override_ascent = -1;
it->pixel_width = 0;
it->nglyphs = 0;
height = get_it_property(it, Qline_height);
/* Split (line-height total-height) list */
if (CONSP (height)
&& CONSP (XCDR (height))
&& NILP (XCDR (XCDR (height))))
{
total_height = XCAR (XCDR (height));
height = XCAR (height);
}
height = calc_line_height_property(it, height, font, boff, 1);
if (it->override_ascent >= 0)
{
it->ascent = it->override_ascent;
it->descent = it->override_descent;
boff = it->override_boff;
}
else
{
it->ascent = FONT_BASE (font) + boff;
it->descent = FONT_DESCENT (font) - boff;
}
if (EQ (height, Qt))
{
if (it->descent > it->max_descent)
{
it->ascent += it->descent - it->max_descent;
it->descent = it->max_descent;
}
if (it->ascent > it->max_ascent)
{
it->descent = min (it->max_descent, it->descent + it->ascent - it->max_ascent);
it->ascent = it->max_ascent;
}
it->phys_ascent = min (it->phys_ascent, it->ascent);
it->phys_descent = min (it->phys_descent, it->descent);
it->constrain_row_ascent_descent_p = 1;
extra_line_spacing = 0;
}
else
{
Lisp_Object spacing;
it->phys_ascent = it->ascent;
it->phys_descent = it->descent;
if ((it->max_ascent > 0 || it->max_descent > 0)
&& face->box != FACE_NO_BOX
&& face->box_line_width > 0)
{
it->ascent += face->box_line_width;
it->descent += face->box_line_width;
}
if (!NILP (height)
&& XINT (height) > it->ascent + it->descent)
it->ascent = XINT (height) - it->descent;
if (!NILP (total_height))
spacing = calc_line_height_property(it, total_height, font, boff, 0);
else
{
spacing = get_it_property(it, Qline_spacing);
spacing = calc_line_height_property(it, spacing, font, boff, 0);
}
if (INTEGERP (spacing))
{
extra_line_spacing = XINT (spacing);
if (!NILP (total_height))
extra_line_spacing -= (it->phys_ascent + it->phys_descent);
}
}
}
else if (it->char_to_display == '\t')
{
if (font->space_width > 0)
{
int tab_width = it->tab_width * font->space_width;
int x = it->current_x + it->continuation_lines_width;
int next_tab_x = ((1 + x + tab_width - 1) / tab_width) * tab_width;
/* If the distance from the current position to the next tab
stop is less than a space character width, use the
tab stop after that. */
if (next_tab_x - x < font->space_width)
next_tab_x += tab_width;
it->pixel_width = next_tab_x - x;
it->nglyphs = 1;
it->ascent = it->phys_ascent = FONT_BASE (font) + boff;
it->descent = it->phys_descent = FONT_DESCENT (font) - boff;
if (it->glyph_row)
{
append_stretch_glyph (it, it->object, it->pixel_width,
it->ascent + it->descent, it->ascent);
}
}
else
{
it->pixel_width = 0;
it->nglyphs = 1;
}
}
else
{
/* A multi-byte character. Assume that the display width of the
character is the width of the character multiplied by the
width of the font. */
/* If we found a font, this font should give us the right
metrics. If we didn't find a font, use the frame's
default font and calculate the width of the character by
multiplying the width of font by the width of the
character. */
pcm = get_per_char_metric (it->f, font, &char2b);
if (font_not_found_p || !pcm)
{
int char_width = CHAR_WIDTH (it->char_to_display);
if (char_width == 0)
/* This is a non spacing character. But, as we are
going to display an empty box, the box must occupy
at least one column. */
char_width = 1;
it->glyph_not_available_p = 1;
it->pixel_width = font->space_width * char_width;
it->phys_ascent = FONT_BASE (font) + boff;
it->phys_descent = FONT_DESCENT (font) - boff;
}
else
{
it->pixel_width = pcm->width;
it->phys_ascent = pcm->ascent + boff;
it->phys_descent = pcm->descent - boff;
if (it->glyph_row
&& (pcm->lbearing < 0
|| pcm->rbearing > pcm->width))
it->glyph_row->contains_overlapping_glyphs_p = 1;
}
it->nglyphs = 1;
it->ascent = FONT_BASE (font) + boff;
it->descent = FONT_DESCENT (font) - boff;
if (face->box != FACE_NO_BOX)
{
int thick = face->box_line_width;
if (thick > 0)
{
it->ascent += thick;
it->descent += thick;
}
else
thick = - thick;
if (it->start_of_box_run_p)
it->pixel_width += thick;
if (it->end_of_box_run_p)
it->pixel_width += thick;
}
/* If face has an overline, add the height of the overline
(1 pixel) and a 1 pixel margin to the character height. */
if (face->overline_p)
it->ascent += overline_margin;
take_vertical_position_into_account (it);
if (it->ascent < 0)
it->ascent = 0;
if (it->descent < 0)
it->descent = 0;
if (it->glyph_row)
append_glyph (it);
if (it->pixel_width == 0)
/* We assure that all visible glyphs have at least 1-pixel
width. */
it->pixel_width = 1;
}
it->multibyte_p = saved_multibyte_p;
}
else if (it->what == IT_COMPOSITION && it->cmp_it.ch < 0)
{
/* A static composition.
Note: A composition is represented as one glyph in the
glyph matrix. There are no padding glyphs.
Important note: pixel_width, ascent, and descent are the
values of what is drawn by draw_glyphs (i.e. the values of
the overall glyphs composed). */
struct face *face = FACE_FROM_ID (it->f, it->face_id);
int boff; /* baseline offset */
struct composition *cmp = composition_table[it->cmp_it.id];
int glyph_len = cmp->glyph_len;
struct font *font = face->font;
it->nglyphs = 1;
/* If we have not yet calculated pixel size data of glyphs of
the composition for the current face font, calculate them
now. Theoretically, we have to check all fonts for the
glyphs, but that requires much time and memory space. So,
here we check only the font of the first glyph. This may
lead to incorrect display, but it's very rare, and C-l
(recenter-top-bottom) can correct the display anyway. */
if (! cmp->font || cmp->font != font)
{
/* Ascent and descent of the font of the first character
of this composition (adjusted by baseline offset).
Ascent and descent of overall glyphs should not be less
than these, respectively. */
int font_ascent, font_descent, font_height;
/* Bounding box of the overall glyphs. */
int leftmost, rightmost, lowest, highest;
int lbearing, rbearing;
int i, width, ascent, descent;
int left_padded = 0, right_padded = 0;
int c;
XChar2b char2b;
struct font_metrics *pcm;
int font_not_found_p;
int pos;
for (glyph_len = cmp->glyph_len; glyph_len > 0; glyph_len--)
if ((c = COMPOSITION_GLYPH (cmp, glyph_len - 1)) != '\t')
break;
if (glyph_len < cmp->glyph_len)
right_padded = 1;
for (i = 0; i < glyph_len; i++)
{
if ((c = COMPOSITION_GLYPH (cmp, i)) != '\t')
break;
cmp->offsets[i * 2] = cmp->offsets[i * 2 + 1] = 0;
}
if (i > 0)
left_padded = 1;
pos = (STRINGP (it->string) ? IT_STRING_CHARPOS (*it)
: IT_CHARPOS (*it));
/* If no suitable font is found, use the default font. */
font_not_found_p = font == NULL;
if (font_not_found_p)
{
face = face->ascii_face;
font = face->font;
}
boff = font->baseline_offset;
if (font->vertical_centering)
boff = VCENTER_BASELINE_OFFSET (font, it->f) - boff;
font_ascent = FONT_BASE (font) + boff;
font_descent = FONT_DESCENT (font) - boff;
font_height = FONT_HEIGHT (font);
cmp->font = (void *) font;
pcm = NULL;
if (! font_not_found_p)
{
get_char_face_and_encoding (it->f, c, it->face_id,
&char2b, it->multibyte_p, 0);
pcm = get_per_char_metric (it->f, font, &char2b);
}
/* Initialize the bounding box. */
if (pcm)
{
width = pcm->width;
ascent = pcm->ascent;
descent = pcm->descent;
lbearing = pcm->lbearing;
rbearing = pcm->rbearing;
}
else
{
width = FONT_WIDTH (font);
ascent = FONT_BASE (font);
descent = FONT_DESCENT (font);
lbearing = 0;
rbearing = width;
}
rightmost = width;
leftmost = 0;
lowest = - descent + boff;
highest = ascent + boff;
if (! font_not_found_p
&& font->default_ascent
&& CHAR_TABLE_P (Vuse_default_ascent)
&& !NILP (Faref (Vuse_default_ascent,
make_number (it->char_to_display))))
highest = font->default_ascent + boff;
/* Draw the first glyph at the normal position. It may be
shifted to right later if some other glyphs are drawn
at the left. */
cmp->offsets[i * 2] = 0;
cmp->offsets[i * 2 + 1] = boff;
cmp->lbearing = lbearing;
cmp->rbearing = rbearing;
/* Set cmp->offsets for the remaining glyphs. */
for (i++; i < glyph_len; i++)
{
int left, right, btm, top;
int ch = COMPOSITION_GLYPH (cmp, i);
int face_id;
struct face *this_face;
int this_boff;
if (ch == '\t')
ch = ' ';
face_id = FACE_FOR_CHAR (it->f, face, ch, pos, it->string);
this_face = FACE_FROM_ID (it->f, face_id);
font = this_face->font;
if (font == NULL)
pcm = NULL;
else
{
this_boff = font->baseline_offset;
if (font->vertical_centering)
this_boff = VCENTER_BASELINE_OFFSET (font, it->f) - boff;
get_char_face_and_encoding (it->f, ch, face_id,
&char2b, it->multibyte_p, 0);
pcm = get_per_char_metric (it->f, font, &char2b);
}
if (! pcm)
cmp->offsets[i * 2] = cmp->offsets[i * 2 + 1] = 0;
else
{
width = pcm->width;
ascent = pcm->ascent;
descent = pcm->descent;
lbearing = pcm->lbearing;
rbearing = pcm->rbearing;
if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS)
{
/* Relative composition with or without
alternate chars. */
left = (leftmost + rightmost - width) / 2;
btm = - descent + boff;
if (font->relative_compose
&& (! CHAR_TABLE_P (Vignore_relative_composition)
|| NILP (Faref (Vignore_relative_composition,
make_number (ch)))))
{
if (- descent >= font->relative_compose)
/* One extra pixel between two glyphs. */
btm = highest + 1;
else if (ascent <= 0)
/* One extra pixel between two glyphs. */
btm = lowest - 1 - ascent - descent;
}
}
else
{
/* A composition rule is specified by an integer
value that encodes global and new reference
points (GREF and NREF). GREF and NREF are
specified by numbers as below:
0---1---2 -- ascent
| |
| |
| |
9--10--11 -- center
| |
---3---4---5--- baseline
| |
6---7---8 -- descent
*/
int rule = COMPOSITION_RULE (cmp, i);
int gref, nref, grefx, grefy, nrefx, nrefy, xoff, yoff;
COMPOSITION_DECODE_RULE (rule, gref, nref, xoff, yoff);
grefx = gref % 3, nrefx = nref % 3;
grefy = gref / 3, nrefy = nref / 3;
if (xoff)
xoff = font_height * (xoff - 128) / 256;
if (yoff)
yoff = font_height * (yoff - 128) / 256;
left = (leftmost
+ grefx * (rightmost - leftmost) / 2
- nrefx * width / 2
+ xoff);
btm = ((grefy == 0 ? highest
: grefy == 1 ? 0
: grefy == 2 ? lowest
: (highest + lowest) / 2)
- (nrefy == 0 ? ascent + descent
: nrefy == 1 ? descent - boff
: nrefy == 2 ? 0
: (ascent + descent) / 2)
+ yoff);
}
cmp->offsets[i * 2] = left;
cmp->offsets[i * 2 + 1] = btm + descent;
/* Update the bounding box of the overall glyphs. */
if (width > 0)
{
right = left + width;
if (left < leftmost)
leftmost = left;
if (right > rightmost)
rightmost = right;
}
top = btm + descent + ascent;
if (top > highest)
highest = top;
if (btm < lowest)
lowest = btm;
if (cmp->lbearing > left + lbearing)
cmp->lbearing = left + lbearing;
if (cmp->rbearing < left + rbearing)
cmp->rbearing = left + rbearing;
}
}
/* If there are glyphs whose x-offsets are negative,
shift all glyphs to the right and make all x-offsets
non-negative. */
if (leftmost < 0)
{
for (i = 0; i < cmp->glyph_len; i++)
cmp->offsets[i * 2] -= leftmost;
rightmost -= leftmost;
cmp->lbearing -= leftmost;
cmp->rbearing -= leftmost;
}
if (left_padded && cmp->lbearing < 0)
{
for (i = 0; i < cmp->glyph_len; i++)
cmp->offsets[i * 2] -= cmp->lbearing;
rightmost -= cmp->lbearing;
cmp->rbearing -= cmp->lbearing;
cmp->lbearing = 0;
}
if (right_padded && rightmost < cmp->rbearing)
{
rightmost = cmp->rbearing;
}
cmp->pixel_width = rightmost;
cmp->ascent = highest;
cmp->descent = - lowest;
if (cmp->ascent < font_ascent)
cmp->ascent = font_ascent;
if (cmp->descent < font_descent)
cmp->descent = font_descent;
}
if (it->glyph_row
&& (cmp->lbearing < 0
|| cmp->rbearing > cmp->pixel_width))
it->glyph_row->contains_overlapping_glyphs_p = 1;
it->pixel_width = cmp->pixel_width;
it->ascent = it->phys_ascent = cmp->ascent;
it->descent = it->phys_descent = cmp->descent;
if (face->box != FACE_NO_BOX)
{
int thick = face->box_line_width;
if (thick > 0)
{
it->ascent += thick;
it->descent += thick;
}
else
thick = - thick;
if (it->start_of_box_run_p)
it->pixel_width += thick;
if (it->end_of_box_run_p)
it->pixel_width += thick;
}
/* If face has an overline, add the height of the overline
(1 pixel) and a 1 pixel margin to the character height. */
if (face->overline_p)
it->ascent += overline_margin;
take_vertical_position_into_account (it);
if (it->ascent < 0)
it->ascent = 0;
if (it->descent < 0)
it->descent = 0;
if (it->glyph_row)
append_composite_glyph (it);
}
else if (it->what == IT_COMPOSITION)
{
/* A dynamic (automatic) composition. */
struct face *face = FACE_FROM_ID (it->f, it->face_id);
Lisp_Object gstring;
struct font_metrics metrics;
gstring = composition_gstring_from_id (it->cmp_it.id);
it->pixel_width
= composition_gstring_width (gstring, it->cmp_it.from, it->cmp_it.to,
&metrics);
if (it->glyph_row
&& (metrics.lbearing < 0 || metrics.rbearing > metrics.width))
it->glyph_row->contains_overlapping_glyphs_p = 1;
it->ascent = it->phys_ascent = metrics.ascent;
it->descent = it->phys_descent = metrics.descent;
if (face->box != FACE_NO_BOX)
{
int thick = face->box_line_width;
if (thick > 0)
{
it->ascent += thick;
it->descent += thick;
}
else
thick = - thick;
if (it->start_of_box_run_p)
it->pixel_width += thick;
if (it->end_of_box_run_p)
it->pixel_width += thick;
}
/* If face has an overline, add the height of the overline
(1 pixel) and a 1 pixel margin to the character height. */
if (face->overline_p)
it->ascent += overline_margin;
take_vertical_position_into_account (it);
if (it->ascent < 0)
it->ascent = 0;
if (it->descent < 0)
it->descent = 0;
if (it->glyph_row)
append_composite_glyph (it);
}
else if (it->what == IT_IMAGE)
produce_image_glyph (it);
else if (it->what == IT_STRETCH)
produce_stretch_glyph (it);
/* Accumulate dimensions. Note: can't assume that it->descent > 0
because this isn't true for images with `:ascent 100'. */
xassert (it->ascent >= 0 && it->descent >= 0);
if (it->area == TEXT_AREA)
it->current_x += it->pixel_width;
if (extra_line_spacing > 0)
{
it->descent += extra_line_spacing;
if (extra_line_spacing > it->max_extra_line_spacing)
it->max_extra_line_spacing = extra_line_spacing;
}
it->max_ascent = max (it->max_ascent, it->ascent);
it->max_descent = max (it->max_descent, it->descent);
it->max_phys_ascent = max (it->max_phys_ascent, it->phys_ascent);
it->max_phys_descent = max (it->max_phys_descent, it->phys_descent);
}
/* EXPORT for RIF:
Output LEN glyphs starting at START at the nominal cursor position.
Advance the nominal cursor over the text. The global variable
updated_window contains the window being updated, updated_row is
the glyph row being updated, and updated_area is the area of that
row being updated. */
void
x_write_glyphs (start, len)
struct glyph *start;
int len;
{
int x, hpos;
xassert (updated_window && updated_row);
BLOCK_INPUT;
/* Write glyphs. */
hpos = start - updated_row->glyphs[updated_area];
x = draw_glyphs (updated_window, output_cursor.x,
updated_row, updated_area,
hpos, hpos + len,
DRAW_NORMAL_TEXT, 0);
/* Invalidate old phys cursor if the glyph at its hpos is redrawn. */
if (updated_area == TEXT_AREA
&& updated_window->phys_cursor_on_p
&& updated_window->phys_cursor.vpos == output_cursor.vpos
&& updated_window->phys_cursor.hpos >= hpos
&& updated_window->phys_cursor.hpos < hpos + len)
updated_window->phys_cursor_on_p = 0;
UNBLOCK_INPUT;
/* Advance the output cursor. */
output_cursor.hpos += len;
output_cursor.x = x;
}
/* EXPORT for RIF:
Insert LEN glyphs from START at the nominal cursor position. */
void
x_insert_glyphs (start, len)
struct glyph *start;
int len;
{
struct frame *f;
struct window *w;
int line_height, shift_by_width, shifted_region_width;
struct glyph_row *row;
struct glyph *glyph;
int frame_x, frame_y;
EMACS_INT hpos;
xassert (updated_window && updated_row);
BLOCK_INPUT;
w = updated_window;
f = XFRAME (WINDOW_FRAME (w));
/* Get the height of the line we are in. */
row = updated_row;
line_height = row->height;
/* Get the width of the glyphs to insert. */
shift_by_width = 0;
for (glyph = start; glyph < start + len; ++glyph)
shift_by_width += glyph->pixel_width;
/* Get the width of the region to shift right. */
shifted_region_width = (window_box_width (w, updated_area)
- output_cursor.x
- shift_by_width);
/* Shift right. */
frame_x = window_box_left (w, updated_area) + output_cursor.x;
frame_y = WINDOW_TO_FRAME_PIXEL_Y (w, output_cursor.y);
FRAME_RIF (f)->shift_glyphs_for_insert (f, frame_x, frame_y, shifted_region_width,
line_height, shift_by_width);
/* Write the glyphs. */
hpos = start - row->glyphs[updated_area];
draw_glyphs (w, output_cursor.x, row, updated_area,
hpos, hpos + len,
DRAW_NORMAL_TEXT, 0);
/* Advance the output cursor. */
output_cursor.hpos += len;
output_cursor.x += shift_by_width;
UNBLOCK_INPUT;
}
/* EXPORT for RIF:
Erase the current text line from the nominal cursor position
(inclusive) to pixel column TO_X (exclusive). The idea is that
everything from TO_X onward is already erased.
TO_X is a pixel position relative to updated_area of
updated_window. TO_X == -1 means clear to the end of this area. */
void
x_clear_end_of_line (to_x)
int to_x;
{
struct frame *f;
struct window *w = updated_window;
int max_x, min_y, max_y;
int from_x, from_y, to_y;
xassert (updated_window && updated_row);
f = XFRAME (w->frame);
if (updated_row->full_width_p)
max_x = WINDOW_TOTAL_WIDTH (w);
else
max_x = window_box_width (w, updated_area);
max_y = window_text_bottom_y (w);
/* TO_X == 0 means don't do anything. TO_X < 0 means clear to end
of window. For TO_X > 0, truncate to end of drawing area. */
if (to_x == 0)
return;
else if (to_x < 0)
to_x = max_x;
else
to_x = min (to_x, max_x);
to_y = min (max_y, output_cursor.y + updated_row->height);
/* Notice if the cursor will be cleared by this operation. */
if (!updated_row->full_width_p)
notice_overwritten_cursor (w, updated_area,
output_cursor.x, -1,
updated_row->y,
MATRIX_ROW_BOTTOM_Y (updated_row));
from_x = output_cursor.x;
/* Translate to frame coordinates. */
if (updated_row->full_width_p)
{
from_x = WINDOW_TO_FRAME_PIXEL_X (w, from_x);
to_x = WINDOW_TO_FRAME_PIXEL_X (w, to_x);
}
else
{
int area_left = window_box_left (w, updated_area);
from_x += area_left;
to_x += area_left;
}
min_y = WINDOW_HEADER_LINE_HEIGHT (w);
from_y = WINDOW_TO_FRAME_PIXEL_Y (w, max (min_y, output_cursor.y));
to_y = WINDOW_TO_FRAME_PIXEL_Y (w, to_y);
/* Prevent inadvertently clearing to end of the X window. */
if (to_x > from_x && to_y > from_y)
{
BLOCK_INPUT;
FRAME_RIF (f)->clear_frame_area (f, from_x, from_y,
to_x - from_x, to_y - from_y);
UNBLOCK_INPUT;
}
}
#endif /* HAVE_WINDOW_SYSTEM */
/***********************************************************************
Cursor types
***********************************************************************/
/* Value is the internal representation of the specified cursor type
ARG. If type is BAR_CURSOR, return in *WIDTH the specified width
of the bar cursor. */
static enum text_cursor_kinds
get_specified_cursor_type (arg, width)
Lisp_Object arg;
int *width;
{
enum text_cursor_kinds type;
if (NILP (arg))
return NO_CURSOR;
if (EQ (arg, Qbox))
return FILLED_BOX_CURSOR;
if (EQ (arg, Qhollow))
return HOLLOW_BOX_CURSOR;
if (EQ (arg, Qbar))
{
*width = 2;
return BAR_CURSOR;
}
if (CONSP (arg)
&& EQ (XCAR (arg), Qbar)
&& INTEGERP (XCDR (arg))
&& XINT (XCDR (arg)) >= 0)
{
*width = XINT (XCDR (arg));
return BAR_CURSOR;
}
if (EQ (arg, Qhbar))
{
*width = 2;
return HBAR_CURSOR;
}
if (CONSP (arg)
&& EQ (XCAR (arg), Qhbar)
&& INTEGERP (XCDR (arg))
&& XINT (XCDR (arg)) >= 0)
{
*width = XINT (XCDR (arg));
return HBAR_CURSOR;
}
/* Treat anything unknown as "hollow box cursor".
It was bad to signal an error; people have trouble fixing
.Xdefaults with Emacs, when it has something bad in it. */
type = HOLLOW_BOX_CURSOR;
return type;
}
/* Set the default cursor types for specified frame. */
void
set_frame_cursor_types (f, arg)
struct frame *f;
Lisp_Object arg;
{
int width;
Lisp_Object tem;
FRAME_DESIRED_CURSOR (f) = get_specified_cursor_type (arg, &width);
FRAME_CURSOR_WIDTH (f) = width;
/* By default, set up the blink-off state depending on the on-state. */
tem = Fassoc (arg, Vblink_cursor_alist);
if (!NILP (tem))
{
FRAME_BLINK_OFF_CURSOR (f)
= get_specified_cursor_type (XCDR (tem), &width);
FRAME_BLINK_OFF_CURSOR_WIDTH (f) = width;
}
else
FRAME_BLINK_OFF_CURSOR (f) = DEFAULT_CURSOR;
}
/* Return the cursor we want to be displayed in window W. Return
width of bar/hbar cursor through WIDTH arg. Return with
ACTIVE_CURSOR arg set to 1 if cursor in window W is `active'
(i.e. if the `system caret' should track this cursor).
In a mini-buffer window, we want the cursor only to appear if we
are reading input from this window. For the selected window, we
want the cursor type given by the frame parameter or buffer local
setting of cursor-type. If explicitly marked off, draw no cursor.
In all other cases, we want a hollow box cursor. */
static enum text_cursor_kinds
get_window_cursor_type (w, glyph, width, active_cursor)
struct window *w;
struct glyph *glyph;
int *width;
int *active_cursor;
{
struct frame *f = XFRAME (w->frame);
struct buffer *b = XBUFFER (w->buffer);
int cursor_type = DEFAULT_CURSOR;
Lisp_Object alt_cursor;
int non_selected = 0;
*active_cursor = 1;
/* Echo area */
if (cursor_in_echo_area
&& FRAME_HAS_MINIBUF_P (f)
&& EQ (FRAME_MINIBUF_WINDOW (f), echo_area_window))
{
if (w == XWINDOW (echo_area_window))
{
if (EQ (b->cursor_type, Qt) || NILP (b->cursor_type))
{
*width = FRAME_CURSOR_WIDTH (f);
return FRAME_DESIRED_CURSOR (f);
}
else
return get_specified_cursor_type (b->cursor_type, width);
}
*active_cursor = 0;
non_selected = 1;
}
/* Detect a nonselected window or nonselected frame. */
else if (w != XWINDOW (f->selected_window)
#ifdef HAVE_WINDOW_SYSTEM
|| f != FRAME_X_DISPLAY_INFO (f)->x_highlight_frame
#endif
)
{
*active_cursor = 0;
if (MINI_WINDOW_P (w) && minibuf_level == 0)
return NO_CURSOR;
non_selected = 1;
}
/* Never display a cursor in a window in which cursor-type is nil. */
if (NILP (b->cursor_type))
return NO_CURSOR;
/* Get the normal cursor type for this window. */
if (EQ (b->cursor_type, Qt))
{
cursor_type = FRAME_DESIRED_CURSOR (f);
*width = FRAME_CURSOR_WIDTH (f);
}
else
cursor_type = get_specified_cursor_type (b->cursor_type, width);
/* Use cursor-in-non-selected-windows instead
for non-selected window or frame. */
if (non_selected)
{
alt_cursor = b->cursor_in_non_selected_windows;
if (!EQ (Qt, alt_cursor))
return get_specified_cursor_type (alt_cursor, width);
/* t means modify the normal cursor type. */
if (cursor_type == FILLED_BOX_CURSOR)
cursor_type = HOLLOW_BOX_CURSOR;
else if (cursor_type == BAR_CURSOR && *width > 1)
--*width;
return cursor_type;
}
/* Use normal cursor if not blinked off. */
if (!w->cursor_off_p)
{
#ifdef HAVE_WINDOW_SYSTEM
if (glyph != NULL && glyph->type == IMAGE_GLYPH)
{
if (cursor_type == FILLED_BOX_CURSOR)
{
/* Using a block cursor on large images can be very annoying.
So use a hollow cursor for "large" images.
If image is not transparent (no mask), also use hollow cursor. */
struct image *img = IMAGE_FROM_ID (f, glyph->u.img_id);
if (img != NULL && IMAGEP (img->spec))
{
/* Arbitrarily, interpret "Large" as >32x32 and >NxN
where N = size of default frame font size.
This should cover most of the "tiny" icons people may use. */
if (!img->mask
|| img->width > max (32, WINDOW_FRAME_COLUMN_WIDTH (w))
|| img->height > max (32, WINDOW_FRAME_LINE_HEIGHT (w)))
cursor_type = HOLLOW_BOX_CURSOR;
}
}
else if (cursor_type != NO_CURSOR)
{
/* Display current only supports BOX and HOLLOW cursors for images.
So for now, unconditionally use a HOLLOW cursor when cursor is
not a solid box cursor. */
cursor_type = HOLLOW_BOX_CURSOR;
}
}
#endif
return cursor_type;
}
/* Cursor is blinked off, so determine how to "toggle" it. */
/* First look for an entry matching the buffer's cursor-type in blink-cursor-alist. */
if ((alt_cursor = Fassoc (b->cursor_type, Vblink_cursor_alist), !NILP (alt_cursor)))
return get_specified_cursor_type (XCDR (alt_cursor), width);
/* Then see if frame has specified a specific blink off cursor type. */
if (FRAME_BLINK_OFF_CURSOR (f) != DEFAULT_CURSOR)
{
*width = FRAME_BLINK_OFF_CURSOR_WIDTH (f);
return FRAME_BLINK_OFF_CURSOR (f);
}
#if 0
/* Some people liked having a permanently visible blinking cursor,
while others had very strong opinions against it. So it was
decided to remove it. KFS 2003-09-03 */
/* Finally perform built-in cursor blinking:
filled box <-> hollow box
wide [h]bar <-> narrow [h]bar
narrow [h]bar <-> no cursor
other type <-> no cursor */
if (cursor_type == FILLED_BOX_CURSOR)
return HOLLOW_BOX_CURSOR;
if ((cursor_type == BAR_CURSOR || cursor_type == HBAR_CURSOR) && *width > 1)
{
*width = 1;
return cursor_type;
}
#endif
return NO_CURSOR;
}
#ifdef HAVE_WINDOW_SYSTEM
/* Notice when the text cursor of window W has been completely
overwritten by a drawing operation that outputs glyphs in AREA
starting at X0 and ending at X1 in the line starting at Y0 and
ending at Y1. X coordinates are area-relative. X1 < 0 means all
the rest of the line after X0 has been written. Y coordinates
are window-relative. */
static void
notice_overwritten_cursor (w, area, x0, x1, y0, y1)
struct window *w;
enum glyph_row_area area;
int x0, y0, x1, y1;
{
int cx0, cx1, cy0, cy1;
struct glyph_row *row;
if (!w->phys_cursor_on_p)
return;
if (area != TEXT_AREA)
return;
if (w->phys_cursor.vpos < 0
|| w->phys_cursor.vpos >= w->current_matrix->nrows
|| (row = w->current_matrix->rows + w->phys_cursor.vpos,
!(row->enabled_p && row->displays_text_p)))
return;
if (row->cursor_in_fringe_p)
{
row->cursor_in_fringe_p = 0;
draw_fringe_bitmap (w, row, 0);
w->phys_cursor_on_p = 0;
return;
}
cx0 = w->phys_cursor.x;
cx1 = cx0 + w->phys_cursor_width;
if (x0 > cx0 || (x1 >= 0 && x1 < cx1))
return;
/* The cursor image will be completely removed from the
screen if the output area intersects the cursor area in
y-direction. When we draw in [y0 y1[, and some part of
the cursor is at y < y0, that part must have been drawn
before. When scrolling, the cursor is erased before
actually scrolling, so we don't come here. When not
scrolling, the rows above the old cursor row must have
changed, and in this case these rows must have written
over the cursor image.
Likewise if part of the cursor is below y1, with the
exception of the cursor being in the first blank row at
the buffer and window end because update_text_area
doesn't draw that row. (Except when it does, but
that's handled in update_text_area.) */
cy0 = w->phys_cursor.y;
cy1 = cy0 + w->phys_cursor_height;
if ((y0 < cy0 || y0 >= cy1) && (y1 <= cy0 || y1 >= cy1))
return;
w->phys_cursor_on_p = 0;
}
#endif /* HAVE_WINDOW_SYSTEM */
/************************************************************************
Mouse Face
************************************************************************/
#ifdef HAVE_WINDOW_SYSTEM
/* EXPORT for RIF:
Fix the display of area AREA of overlapping row ROW in window W
with respect to the overlapping part OVERLAPS. */
void
x_fix_overlapping_area (w, row, area, overlaps)
struct window *w;
struct glyph_row *row;
enum glyph_row_area area;
int overlaps;
{
int i, x;
BLOCK_INPUT;
x = 0;
for (i = 0; i < row->used[area];)
{
if (row->glyphs[area][i].overlaps_vertically_p)
{
int start = i, start_x = x;
do
{
x += row->glyphs[area][i].pixel_width;
++i;
}
while (i < row->used[area]
&& row->glyphs[area][i].overlaps_vertically_p);
draw_glyphs (w, start_x, row, area,
start, i,
DRAW_NORMAL_TEXT, overlaps);
}
else
{
x += row->glyphs[area][i].pixel_width;
++i;
}
}
UNBLOCK_INPUT;
}
/* EXPORT:
Draw the cursor glyph of window W in glyph row ROW. See the
comment of draw_glyphs for the meaning of HL. */
void
draw_phys_cursor_glyph (w, row, hl)
struct window *w;
struct glyph_row *row;
enum draw_glyphs_face hl;
{
/* If cursor hpos is out of bounds, don't draw garbage. This can
happen in mini-buffer windows when switching between echo area
glyphs and mini-buffer. */
if (w->phys_cursor.hpos < row->used[TEXT_AREA])
{
int on_p = w->phys_cursor_on_p;
int x1;
x1 = draw_glyphs (w, w->phys_cursor.x, row, TEXT_AREA,
w->phys_cursor.hpos, w->phys_cursor.hpos + 1,
hl, 0);
w->phys_cursor_on_p = on_p;
if (hl == DRAW_CURSOR)
w->phys_cursor_width = x1 - w->phys_cursor.x;
/* When we erase the cursor, and ROW is overlapped by other
rows, make sure that these overlapping parts of other rows
are redrawn. */
else if (hl == DRAW_NORMAL_TEXT && row->overlapped_p)
{
w->phys_cursor_width = x1 - w->phys_cursor.x;
if (row > w->current_matrix->rows
&& MATRIX_ROW_OVERLAPS_SUCC_P (row - 1))
x_fix_overlapping_area (w, row - 1, TEXT_AREA,
OVERLAPS_ERASED_CURSOR);
if (MATRIX_ROW_BOTTOM_Y (row) < window_text_bottom_y (w)
&& MATRIX_ROW_OVERLAPS_PRED_P (row + 1))
x_fix_overlapping_area (w, row + 1, TEXT_AREA,
OVERLAPS_ERASED_CURSOR);
}
}
}
/* EXPORT:
Erase the image of a cursor of window W from the screen. */
void
erase_phys_cursor (w)
struct window *w;
{
struct frame *f = XFRAME (w->frame);
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
int hpos = w->phys_cursor.hpos;
int vpos = w->phys_cursor.vpos;
int mouse_face_here_p = 0;
struct glyph_matrix *active_glyphs = w->current_matrix;
struct glyph_row *cursor_row;
struct glyph *cursor_glyph;
enum draw_glyphs_face hl;
/* No cursor displayed or row invalidated => nothing to do on the
screen. */
if (w->phys_cursor_type == NO_CURSOR)
goto mark_cursor_off;
/* VPOS >= active_glyphs->nrows means that window has been resized.
Don't bother to erase the cursor. */
if (vpos >= active_glyphs->nrows)
goto mark_cursor_off;
/* If row containing cursor is marked invalid, there is nothing we
can do. */
cursor_row = MATRIX_ROW (active_glyphs, vpos);
if (!cursor_row->enabled_p)
goto mark_cursor_off;
/* If line spacing is > 0, old cursor may only be partially visible in
window after split-window. So adjust visible height. */
cursor_row->visible_height = min (cursor_row->visible_height,
window_text_bottom_y (w) - cursor_row->y);
/* If row is completely invisible, don't attempt to delete a cursor which
isn't there. This can happen if cursor is at top of a window, and
we switch to a buffer with a header line in that window. */
if (cursor_row->visible_height <= 0)
goto mark_cursor_off;
/* If cursor is in the fringe, erase by drawing actual bitmap there. */
if (cursor_row->cursor_in_fringe_p)
{
cursor_row->cursor_in_fringe_p = 0;
draw_fringe_bitmap (w, cursor_row, 0);
goto mark_cursor_off;
}
/* This can happen when the new row is shorter than the old one.
In this case, either draw_glyphs or clear_end_of_line
should have cleared the cursor. Note that we wouldn't be
able to erase the cursor in this case because we don't have a
cursor glyph at hand. */
if (w->phys_cursor.hpos >= cursor_row->used[TEXT_AREA])
goto mark_cursor_off;
/* If the cursor is in the mouse face area, redisplay that when
we clear the cursor. */
if (! NILP (dpyinfo->mouse_face_window)
&& w == XWINDOW (dpyinfo->mouse_face_window)
&& (vpos > dpyinfo->mouse_face_beg_row
|| (vpos == dpyinfo->mouse_face_beg_row
&& hpos >= dpyinfo->mouse_face_beg_col))
&& (vpos < dpyinfo->mouse_face_end_row
|| (vpos == dpyinfo->mouse_face_end_row
&& hpos < dpyinfo->mouse_face_end_col))
/* Don't redraw the cursor's spot in mouse face if it is at the
end of a line (on a newline). The cursor appears there, but
mouse highlighting does not. */
&& cursor_row->used[TEXT_AREA] > hpos)
mouse_face_here_p = 1;
/* Maybe clear the display under the cursor. */
if (w->phys_cursor_type == HOLLOW_BOX_CURSOR)
{
int x, y, left_x;
int header_line_height = WINDOW_HEADER_LINE_HEIGHT (w);
int width;
cursor_glyph = get_phys_cursor_glyph (w);
if (cursor_glyph == NULL)
goto mark_cursor_off;
width = cursor_glyph->pixel_width;
left_x = window_box_left_offset (w, TEXT_AREA);
x = w->phys_cursor.x;
if (x < left_x)
width -= left_x - x;
width = min (width, window_box_width (w, TEXT_AREA) - x);
y = WINDOW_TO_FRAME_PIXEL_Y (w, max (header_line_height, cursor_row->y));
x = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, max (x, left_x));
if (width > 0)
FRAME_RIF (f)->clear_frame_area (f, x, y, width, cursor_row->visible_height);
}
/* Erase the cursor by redrawing the character underneath it. */
if (mouse_face_here_p)
hl = DRAW_MOUSE_FACE;
else
hl = DRAW_NORMAL_TEXT;
draw_phys_cursor_glyph (w, cursor_row, hl);
mark_cursor_off:
w->phys_cursor_on_p = 0;
w->phys_cursor_type = NO_CURSOR;
}
/* EXPORT:
Display or clear cursor of window W. If ON is zero, clear the
cursor. If it is non-zero, display the cursor. If ON is nonzero,
where to put the cursor is specified by HPOS, VPOS, X and Y. */
void
display_and_set_cursor (w, on, hpos, vpos, x, y)
struct window *w;
int on, hpos, vpos, x, y;
{
struct frame *f = XFRAME (w->frame);
int new_cursor_type;
int new_cursor_width;
int active_cursor;
struct glyph_row *glyph_row;
struct glyph *glyph;
/* This is pointless on invisible frames, and dangerous on garbaged
windows and frames; in the latter case, the frame or window may
be in the midst of changing its size, and x and y may be off the
window. */
if (! FRAME_VISIBLE_P (f)
|| FRAME_GARBAGED_P (f)
|| vpos >= w->current_matrix->nrows
|| hpos >= w->current_matrix->matrix_w)
return;
/* If cursor is off and we want it off, return quickly. */
if (!on && !w->phys_cursor_on_p)
return;
glyph_row = MATRIX_ROW (w->current_matrix, vpos);
/* If cursor row is not enabled, we don't really know where to
display the cursor. */
if (!glyph_row->enabled_p)
{
w->phys_cursor_on_p = 0;
return;
}
glyph = NULL;
if (!glyph_row->exact_window_width_line_p
|| hpos < glyph_row->used[TEXT_AREA])
glyph = glyph_row->glyphs[TEXT_AREA] + hpos;
xassert (interrupt_input_blocked);
/* Set new_cursor_type to the cursor we want to be displayed. */
new_cursor_type = get_window_cursor_type (w, glyph,
&new_cursor_width, &active_cursor);
/* If cursor is currently being shown and we don't want it to be or
it is in the wrong place, or the cursor type is not what we want,
erase it. */
if (w->phys_cursor_on_p
&& (!on
|| w->phys_cursor.x != x
|| w->phys_cursor.y != y
|| new_cursor_type != w->phys_cursor_type
|| ((new_cursor_type == BAR_CURSOR || new_cursor_type == HBAR_CURSOR)
&& new_cursor_width != w->phys_cursor_width)))
erase_phys_cursor (w);
/* Don't check phys_cursor_on_p here because that flag is only set
to zero in some cases where we know that the cursor has been
completely erased, to avoid the extra work of erasing the cursor
twice. In other words, phys_cursor_on_p can be 1 and the cursor
still not be visible, or it has only been partly erased. */
if (on)
{
w->phys_cursor_ascent = glyph_row->ascent;
w->phys_cursor_height = glyph_row->height;
/* Set phys_cursor_.* before x_draw_.* is called because some
of them may need the information. */
w->phys_cursor.x = x;
w->phys_cursor.y = glyph_row->y;
w->phys_cursor.hpos = hpos;
w->phys_cursor.vpos = vpos;
}
FRAME_RIF (f)->draw_window_cursor (w, glyph_row, x, y,
new_cursor_type, new_cursor_width,
on, active_cursor);
}
/* Switch the display of W's cursor on or off, according to the value
of ON. */
void
update_window_cursor (w, on)
struct window *w;
int on;
{
/* Don't update cursor in windows whose frame is in the process
of being deleted. */
if (w->current_matrix)
{
BLOCK_INPUT;
display_and_set_cursor (w, on, w->phys_cursor.hpos, w->phys_cursor.vpos,
w->phys_cursor.x, w->phys_cursor.y);
UNBLOCK_INPUT;
}
}
/* Call update_window_cursor with parameter ON_P on all leaf windows
in the window tree rooted at W. */
static void
update_cursor_in_window_tree (w, on_p)
struct window *w;
int on_p;
{
while (w)
{
if (!NILP (w->hchild))
update_cursor_in_window_tree (XWINDOW (w->hchild), on_p);
else if (!NILP (w->vchild))
update_cursor_in_window_tree (XWINDOW (w->vchild), on_p);
else
update_window_cursor (w, on_p);
w = NILP (w->next) ? 0 : XWINDOW (w->next);
}
}
/* EXPORT:
Display the cursor on window W, or clear it, according to ON_P.
Don't change the cursor's position. */
void
x_update_cursor (f, on_p)
struct frame *f;
int on_p;
{
update_cursor_in_window_tree (XWINDOW (f->root_window), on_p);
}
/* EXPORT:
Clear the cursor of window W to background color, and mark the
cursor as not shown. This is used when the text where the cursor
is about to be rewritten. */
void
x_clear_cursor (w)
struct window *w;
{
if (FRAME_VISIBLE_P (XFRAME (w->frame)) && w->phys_cursor_on_p)
update_window_cursor (w, 0);
}
/* EXPORT:
Display the active region described by mouse_face_* according to DRAW. */
void
show_mouse_face (dpyinfo, draw)
Display_Info *dpyinfo;
enum draw_glyphs_face draw;
{
struct window *w = XWINDOW (dpyinfo->mouse_face_window);
struct frame *f = XFRAME (WINDOW_FRAME (w));
if (/* If window is in the process of being destroyed, don't bother
to do anything. */
w->current_matrix != NULL
/* Don't update mouse highlight if hidden */
&& (draw != DRAW_MOUSE_FACE || !dpyinfo->mouse_face_hidden)
/* Recognize when we are called to operate on rows that don't exist
anymore. This can happen when a window is split. */
&& dpyinfo->mouse_face_end_row < w->current_matrix->nrows)
{
int phys_cursor_on_p = w->phys_cursor_on_p;
struct glyph_row *row, *first, *last;
first = MATRIX_ROW (w->current_matrix, dpyinfo->mouse_face_beg_row);
last = MATRIX_ROW (w->current_matrix, dpyinfo->mouse_face_end_row);
for (row = first; row <= last && row->enabled_p; ++row)
{
int start_hpos, end_hpos, start_x;
/* For all but the first row, the highlight starts at column 0. */
if (row == first)
{
start_hpos = dpyinfo->mouse_face_beg_col;
start_x = dpyinfo->mouse_face_beg_x;
}
else
{
start_hpos = 0;
start_x = 0;
}
if (row == last)
end_hpos = dpyinfo->mouse_face_end_col;
else
{
end_hpos = row->used[TEXT_AREA];
if (draw == DRAW_NORMAL_TEXT)
row->fill_line_p = 1; /* Clear to end of line */
}
if (end_hpos > start_hpos)
{
draw_glyphs (w, start_x, row, TEXT_AREA,
start_hpos, end_hpos,
draw, 0);
row->mouse_face_p
= draw == DRAW_MOUSE_FACE || draw == DRAW_IMAGE_RAISED;
}
}
/* When we've written over the cursor, arrange for it to
be displayed again. */
if (phys_cursor_on_p && !w->phys_cursor_on_p)
{
BLOCK_INPUT;
display_and_set_cursor (w, 1,
w->phys_cursor.hpos, w->phys_cursor.vpos,
w->phys_cursor.x, w->phys_cursor.y);
UNBLOCK_INPUT;
}
}
/* Change the mouse cursor. */
if (draw == DRAW_NORMAL_TEXT && !EQ (dpyinfo->mouse_face_window, f->tool_bar_window))
FRAME_RIF (f)->define_frame_cursor (f, FRAME_X_OUTPUT (f)->text_cursor);
else if (draw == DRAW_MOUSE_FACE)
FRAME_RIF (f)->define_frame_cursor (f, FRAME_X_OUTPUT (f)->hand_cursor);
else
FRAME_RIF (f)->define_frame_cursor (f, FRAME_X_OUTPUT (f)->nontext_cursor);
}
/* EXPORT:
Clear out the mouse-highlighted active region.
Redraw it un-highlighted first. Value is non-zero if mouse
face was actually drawn unhighlighted. */
int
clear_mouse_face (dpyinfo)
Display_Info *dpyinfo;
{
int cleared = 0;
if (!dpyinfo->mouse_face_hidden && !NILP (dpyinfo->mouse_face_window))
{
show_mouse_face (dpyinfo, DRAW_NORMAL_TEXT);
cleared = 1;
}
dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
dpyinfo->mouse_face_window = Qnil;
dpyinfo->mouse_face_overlay = Qnil;
return cleared;
}
/* EXPORT:
Non-zero if physical cursor of window W is within mouse face. */
int
cursor_in_mouse_face_p (w)
struct window *w;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (XFRAME (w->frame));
int in_mouse_face = 0;
if (WINDOWP (dpyinfo->mouse_face_window)
&& XWINDOW (dpyinfo->mouse_face_window) == w)
{
int hpos = w->phys_cursor.hpos;
int vpos = w->phys_cursor.vpos;
if (vpos >= dpyinfo->mouse_face_beg_row
&& vpos <= dpyinfo->mouse_face_end_row
&& (vpos > dpyinfo->mouse_face_beg_row
|| hpos >= dpyinfo->mouse_face_beg_col)
&& (vpos < dpyinfo->mouse_face_end_row
|| hpos < dpyinfo->mouse_face_end_col
|| dpyinfo->mouse_face_past_end))
in_mouse_face = 1;
}
return in_mouse_face;
}
/* This function sets the mouse_face_* elements of DPYINFO, assuming
the mouse cursor is on a glyph with buffer charpos MOUSE_CHARPOS in
window WINDOW. START_CHARPOS and END_CHARPOS are buffer positions
for the overlay or run of text properties specifying the mouse
face. BEFORE_STRING and AFTER_STRING, if non-nil, are a
before-string and after-string that must also be highlighted.
DISPLAY_STRING, if non-nil, is a display string that may cover some
or all of the highlighted text. */
static void
mouse_face_from_buffer_pos (Lisp_Object window,
Display_Info *dpyinfo,
EMACS_INT mouse_charpos,
EMACS_INT start_charpos,
EMACS_INT end_charpos,
Lisp_Object before_string,
Lisp_Object after_string,
Lisp_Object display_string)
{
struct window *w = XWINDOW (window);
struct glyph_row *first = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
struct glyph_row *row;
struct glyph *glyph, *end;
EMACS_INT ignore;
int x;
xassert (NILP (display_string) || STRINGP (display_string));
xassert (NILP (before_string) || STRINGP (before_string));
xassert (NILP (after_string) || STRINGP (after_string));
/* Find the first highlighted glyph. */
if (start_charpos < MATRIX_ROW_START_CHARPOS (first))
{
dpyinfo->mouse_face_beg_col = 0;
dpyinfo->mouse_face_beg_row = MATRIX_ROW_VPOS (first, w->current_matrix);
dpyinfo->mouse_face_beg_x = first->x;
dpyinfo->mouse_face_beg_y = first->y;
}
else
{
row = row_containing_pos (w, start_charpos, first, NULL, 0);
if (row == NULL)
row = MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos));
/* If the before-string or display-string contains newlines,
row_containing_pos skips to its last row. Move back. */
if (!NILP (before_string) || !NILP (display_string))
{
struct glyph_row *prev;
while ((prev = row - 1, prev >= first)
&& MATRIX_ROW_END_CHARPOS (prev) == start_charpos
&& prev->used[TEXT_AREA] > 0)
{
struct glyph *beg = prev->glyphs[TEXT_AREA];
glyph = beg + prev->used[TEXT_AREA];
while (--glyph >= beg && INTEGERP (glyph->object));
if (glyph < beg
|| !(EQ (glyph->object, before_string)
|| EQ (glyph->object, display_string)))
break;
row = prev;
}
}
glyph = row->glyphs[TEXT_AREA];
end = glyph + row->used[TEXT_AREA];
x = row->x;
dpyinfo->mouse_face_beg_y = row->y;
dpyinfo->mouse_face_beg_row = MATRIX_ROW_VPOS (row, w->current_matrix);
/* Skip truncation glyphs at the start of the glyph row. */
if (row->displays_text_p)
for (; glyph < end
&& INTEGERP (glyph->object)
&& glyph->charpos < 0;
++glyph)
x += glyph->pixel_width;
/* Scan the glyph row, stopping before BEFORE_STRING or
DISPLAY_STRING or START_CHARPOS. */
for (; glyph < end
&& !INTEGERP (glyph->object)
&& !EQ (glyph->object, before_string)
&& !EQ (glyph->object, display_string)
&& !(BUFFERP (glyph->object)
&& glyph->charpos >= start_charpos);
++glyph)
x += glyph->pixel_width;
dpyinfo->mouse_face_beg_x = x;
dpyinfo->mouse_face_beg_col = glyph - row->glyphs[TEXT_AREA];
}
/* Find the last highlighted glyph. */
row = row_containing_pos (w, end_charpos, first, NULL, 0);
if (row == NULL)
{
row = MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos));
dpyinfo->mouse_face_past_end = 1;
}
else if (!NILP (after_string))
{
/* If the after-string has newlines, advance to its last row. */
struct glyph_row *next;
struct glyph_row *last
= MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos));
for (next = row + 1;
next <= last
&& next->used[TEXT_AREA] > 0
&& EQ (next->glyphs[TEXT_AREA]->object, after_string);
++next)
row = next;
}
glyph = row->glyphs[TEXT_AREA];
end = glyph + row->used[TEXT_AREA];
x = row->x;
dpyinfo->mouse_face_end_y = row->y;
dpyinfo->mouse_face_end_row = MATRIX_ROW_VPOS (row, w->current_matrix);
/* Skip truncation glyphs at the start of the row. */
if (row->displays_text_p)
for (; glyph < end
&& INTEGERP (glyph->object)
&& glyph->charpos < 0;
++glyph)
x += glyph->pixel_width;
/* Scan the glyph row, stopping at END_CHARPOS or when we encounter
AFTER_STRING. */
for (; glyph < end
&& !INTEGERP (glyph->object)
&& !EQ (glyph->object, after_string)
&& !(BUFFERP (glyph->object) && glyph->charpos >= end_charpos);
++glyph)
x += glyph->pixel_width;
/* If we found AFTER_STRING, consume it and stop. */
if (EQ (glyph->object, after_string))
{
for (; EQ (glyph->object, after_string) && glyph < end; ++glyph)
x += glyph->pixel_width;
}
else
{
/* If there's no after-string, we must check if we overshot,
which might be the case if we stopped after a string glyph.
That glyph may belong to a before-string or display-string
associated with the end position, which must not be
highlighted. */
Lisp_Object prev_object;
int pos;
while (glyph > row->glyphs[TEXT_AREA])
{
prev_object = (glyph - 1)->object;
if (!STRINGP (prev_object) || EQ (prev_object, display_string))
break;
pos = string_buffer_position (w, prev_object, end_charpos);
if (pos && pos < end_charpos)
break;
for (; glyph > row->glyphs[TEXT_AREA]
&& EQ ((glyph - 1)->object, prev_object);
--glyph)
x -= (glyph - 1)->pixel_width;
}
}
dpyinfo->mouse_face_end_x = x;
dpyinfo->mouse_face_end_col = glyph - row->glyphs[TEXT_AREA];
dpyinfo->mouse_face_window = window;
dpyinfo->mouse_face_face_id
= face_at_buffer_position (w, mouse_charpos, 0, 0, &ignore,
mouse_charpos + 1,
!dpyinfo->mouse_face_hidden, -1);
show_mouse_face (dpyinfo, DRAW_MOUSE_FACE);
}
/* Find the position of the glyph for position POS in OBJECT in
window W's current matrix, and return in *X, *Y the pixel
coordinates, and return in *HPOS, *VPOS the column/row of the glyph.
RIGHT_P non-zero means return the position of the right edge of the
glyph, RIGHT_P zero means return the left edge position.
If no glyph for POS exists in the matrix, return the position of
the glyph with the next smaller position that is in the matrix, if
RIGHT_P is zero. If RIGHT_P is non-zero, and no glyph for POS
exists in the matrix, return the position of the glyph with the
next larger position in OBJECT.
Value is non-zero if a glyph was found. */
static int
fast_find_string_pos (w, pos, object, hpos, vpos, x, y, right_p)
struct window *w;
EMACS_INT pos;
Lisp_Object object;
int *hpos, *vpos, *x, *y;
int right_p;
{
int yb = window_text_bottom_y (w);
struct glyph_row *r;
struct glyph *best_glyph = NULL;
struct glyph_row *best_row = NULL;
int best_x = 0;
for (r = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
r->enabled_p && r->y < yb;
++r)
{
struct glyph *g = r->glyphs[TEXT_AREA];
struct glyph *e = g + r->used[TEXT_AREA];
int gx;
for (gx = r->x; g < e; gx += g->pixel_width, ++g)
if (EQ (g->object, object))
{
if (g->charpos == pos)
{
best_glyph = g;
best_x = gx;
best_row = r;
goto found;
}
else if (best_glyph == NULL
|| ((eabs (g->charpos - pos)
< eabs (best_glyph->charpos - pos))
&& (right_p
? g->charpos < pos
: g->charpos > pos)))
{
best_glyph = g;
best_x = gx;
best_row = r;
}
}
}
found:
if (best_glyph)
{
*x = best_x;
*hpos = best_glyph - best_row->glyphs[TEXT_AREA];
if (right_p)
{
*x += best_glyph->pixel_width;
++*hpos;
}
*y = best_row->y;
*vpos = best_row - w->current_matrix->rows;
}
return best_glyph != NULL;
}
/* See if position X, Y is within a hot-spot of an image. */
static int
on_hot_spot_p (hot_spot, x, y)
Lisp_Object hot_spot;
int x, y;
{
if (!CONSP (hot_spot))
return 0;
if (EQ (XCAR (hot_spot), Qrect))
{
/* CDR is (Top-Left . Bottom-Right) = ((x0 . y0) . (x1 . y1)) */
Lisp_Object rect = XCDR (hot_spot);
Lisp_Object tem;
if (!CONSP (rect))
return 0;
if (!CONSP (XCAR (rect)))
return 0;
if (!CONSP (XCDR (rect)))
return 0;
if (!(tem = XCAR (XCAR (rect)), INTEGERP (tem) && x >= XINT (tem)))
return 0;
if (!(tem = XCDR (XCAR (rect)), INTEGERP (tem) && y >= XINT (tem)))
return 0;
if (!(tem = XCAR (XCDR (rect)), INTEGERP (tem) && x <= XINT (tem)))
return 0;
if (!(tem = XCDR (XCDR (rect)), INTEGERP (tem) && y <= XINT (tem)))
return 0;
return 1;
}
else if (EQ (XCAR (hot_spot), Qcircle))
{
/* CDR is (Center . Radius) = ((x0 . y0) . r) */
Lisp_Object circ = XCDR (hot_spot);
Lisp_Object lr, lx0, ly0;
if (CONSP (circ)
&& CONSP (XCAR (circ))
&& (lr = XCDR (circ), INTEGERP (lr) || FLOATP (lr))
&& (lx0 = XCAR (XCAR (circ)), INTEGERP (lx0))
&& (ly0 = XCDR (XCAR (circ)), INTEGERP (ly0)))
{
double r = XFLOATINT (lr);
double dx = XINT (lx0) - x;
double dy = XINT (ly0) - y;
return (dx * dx + dy * dy <= r * r);
}
}
else if (EQ (XCAR (hot_spot), Qpoly))
{
/* CDR is [x0 y0 x1 y1 x2 y2 ...x(n-1) y(n-1)] */
if (VECTORP (XCDR (hot_spot)))
{
struct Lisp_Vector *v = XVECTOR (XCDR (hot_spot));
Lisp_Object *poly = v->contents;
int n = v->size;
int i;
int inside = 0;
Lisp_Object lx, ly;
int x0, y0;
/* Need an even number of coordinates, and at least 3 edges. */
if (n < 6 || n & 1)
return 0;
/* Count edge segments intersecting line from (X,Y) to (X,infinity).
If count is odd, we are inside polygon. Pixels on edges
may or may not be included depending on actual geometry of the
polygon. */
if ((lx = poly[n-2], !INTEGERP (lx))
|| (ly = poly[n-1], !INTEGERP (lx)))
return 0;
x0 = XINT (lx), y0 = XINT (ly);
for (i = 0; i < n; i += 2)
{
int x1 = x0, y1 = y0;
if ((lx = poly[i], !INTEGERP (lx))
|| (ly = poly[i+1], !INTEGERP (ly)))
return 0;
x0 = XINT (lx), y0 = XINT (ly);
/* Does this segment cross the X line? */
if (x0 >= x)
{
if (x1 >= x)
continue;
}
else if (x1 < x)
continue;
if (y > y0 && y > y1)
continue;
if (y < y0 + ((y1 - y0) * (x - x0)) / (x1 - x0))
inside = !inside;
}
return inside;
}
}
return 0;
}
Lisp_Object
find_hot_spot (map, x, y)
Lisp_Object map;
int x, y;
{
while (CONSP (map))
{
if (CONSP (XCAR (map))
&& on_hot_spot_p (XCAR (XCAR (map)), x, y))
return XCAR (map);
map = XCDR (map);
}
return Qnil;
}
DEFUN ("lookup-image-map", Flookup_image_map, Slookup_image_map,
3, 3, 0,
doc: /* Lookup in image map MAP coordinates X and Y.
An image map is an alist where each element has the format (AREA ID PLIST).
An AREA is specified as either a rectangle, a circle, or a polygon:
A rectangle is a cons (rect . ((x0 . y0) . (x1 . y1))) specifying the
pixel coordinates of the upper left and bottom right corners.
A circle is a cons (circle . ((x0 . y0) . r)) specifying the center
and the radius of the circle; r may be a float or integer.
A polygon is a cons (poly . [x0 y0 x1 y1 ...]) where each pair in the
vector describes one corner in the polygon.
Returns the alist element for the first matching AREA in MAP. */)
(map, x, y)
Lisp_Object map;
Lisp_Object x, y;
{
if (NILP (map))
return Qnil;
CHECK_NUMBER (x);
CHECK_NUMBER (y);
return find_hot_spot (map, XINT (x), XINT (y));
}
/* Display frame CURSOR, optionally using shape defined by POINTER. */
static void
define_frame_cursor1 (f, cursor, pointer)
struct frame *f;
Cursor cursor;
Lisp_Object pointer;
{
/* Do not change cursor shape while dragging mouse. */
if (!NILP (do_mouse_tracking))
return;
if (!NILP (pointer))
{
if (EQ (pointer, Qarrow))
cursor = FRAME_X_OUTPUT (f)->nontext_cursor;
else if (EQ (pointer, Qhand))
cursor = FRAME_X_OUTPUT (f)->hand_cursor;
else if (EQ (pointer, Qtext))
cursor = FRAME_X_OUTPUT (f)->text_cursor;
else if (EQ (pointer, intern ("hdrag")))
cursor = FRAME_X_OUTPUT (f)->horizontal_drag_cursor;
#ifdef HAVE_X_WINDOWS
else if (EQ (pointer, intern ("vdrag")))
cursor = FRAME_X_DISPLAY_INFO (f)->vertical_scroll_bar_cursor;
#endif
else if (EQ (pointer, intern ("hourglass")))
cursor = FRAME_X_OUTPUT (f)->hourglass_cursor;
else if (EQ (pointer, Qmodeline))
cursor = FRAME_X_OUTPUT (f)->modeline_cursor;
else
cursor = FRAME_X_OUTPUT (f)->nontext_cursor;
}
if (cursor != No_Cursor)
FRAME_RIF (f)->define_frame_cursor (f, cursor);
}
/* Take proper action when mouse has moved to the mode or header line
or marginal area AREA of window W, x-position X and y-position Y.
X is relative to the start of the text display area of W, so the
width of bitmap areas and scroll bars must be subtracted to get a
position relative to the start of the mode line. */
static void
note_mode_line_or_margin_highlight (window, x, y, area)
Lisp_Object window;
int x, y;
enum window_part area;
{
struct window *w = XWINDOW (window);
struct frame *f = XFRAME (w->frame);
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
Cursor cursor = FRAME_X_OUTPUT (f)->nontext_cursor;
Lisp_Object pointer = Qnil;
int charpos, dx, dy, width, height;
Lisp_Object string, object = Qnil;
Lisp_Object pos, help;
Lisp_Object mouse_face;
int original_x_pixel = x;
struct glyph * glyph = NULL, * row_start_glyph = NULL;
struct glyph_row *row;
if (area == ON_MODE_LINE || area == ON_HEADER_LINE)
{
int x0;
struct glyph *end;
string = mode_line_string (w, area, &x, &y, &charpos,
&object, &dx, &dy, &width, &height);
row = (area == ON_MODE_LINE
? MATRIX_MODE_LINE_ROW (w->current_matrix)
: MATRIX_HEADER_LINE_ROW (w->current_matrix));
/* Find glyph */
if (row->mode_line_p && row->enabled_p)
{
glyph = row_start_glyph = row->glyphs[TEXT_AREA];
end = glyph + row->used[TEXT_AREA];
for (x0 = original_x_pixel;
glyph < end && x0 >= glyph->pixel_width;
++glyph)
x0 -= glyph->pixel_width;
if (glyph >= end)
glyph = NULL;
}
}
else
{
x -= WINDOW_LEFT_SCROLL_BAR_AREA_WIDTH (w);
string = marginal_area_string (w, area, &x, &y, &charpos,
&object, &dx, &dy, &width, &height);
}
help = Qnil;
if (IMAGEP (object))
{
Lisp_Object image_map, hotspot;
if ((image_map = Fplist_get (XCDR (object), QCmap),
!NILP (image_map))
&& (hotspot = find_hot_spot (image_map, dx, dy),
CONSP (hotspot))
&& (hotspot = XCDR (hotspot), CONSP (hotspot)))
{
Lisp_Object area_id, plist;
area_id = XCAR (hotspot);
/* Could check AREA_ID to see if we enter/leave this hot-spot.
If so, we could look for mouse-enter, mouse-leave
properties in PLIST (and do something...). */
hotspot = XCDR (hotspot);
if (CONSP (hotspot)
&& (plist = XCAR (hotspot), CONSP (plist)))
{
pointer = Fplist_get (plist, Qpointer);
if (NILP (pointer))
pointer = Qhand;
help = Fplist_get (plist, Qhelp_echo);
if (!NILP (help))
{
help_echo_string = help;
/* Is this correct? ++kfs */
XSETWINDOW (help_echo_window, w);
help_echo_object = w->buffer;
help_echo_pos = charpos;
}
}
}
if (NILP (pointer))
pointer = Fplist_get (XCDR (object), QCpointer);
}
if (STRINGP (string))
{
pos = make_number (charpos);
/* If we're on a string with `help-echo' text property, arrange
for the help to be displayed. This is done by setting the
global variable help_echo_string to the help string. */
if (NILP (help))
{
help = Fget_text_property (pos, Qhelp_echo, string);
if (!NILP (help))
{
help_echo_string = help;
XSETWINDOW (help_echo_window, w);
help_echo_object = string;
help_echo_pos = charpos;
}
}
if (NILP (pointer))
pointer = Fget_text_property (pos, Qpointer, string);
/* Change the mouse pointer according to what is under X/Y. */
if (NILP (pointer) && ((area == ON_MODE_LINE) || (area == ON_HEADER_LINE)))
{
Lisp_Object map;
map = Fget_text_property (pos, Qlocal_map, string);
if (!KEYMAPP (map))
map = Fget_text_property (pos, Qkeymap, string);
if (!KEYMAPP (map))
cursor = dpyinfo->vertical_scroll_bar_cursor;
}
/* Change the mouse face according to what is under X/Y. */
mouse_face = Fget_text_property (pos, Qmouse_face, string);
if (!NILP (mouse_face)
&& ((area == ON_MODE_LINE) || (area == ON_HEADER_LINE))
&& glyph)
{
Lisp_Object b, e;
struct glyph * tmp_glyph;
int gpos;
int gseq_length;
int total_pixel_width;
EMACS_INT ignore;
int vpos, hpos;
b = Fprevious_single_property_change (make_number (charpos + 1),
Qmouse_face, string, Qnil);
if (NILP (b))
b = make_number (0);
e = Fnext_single_property_change (pos, Qmouse_face, string, Qnil);
if (NILP (e))
e = make_number (SCHARS (string));
/* Calculate the position(glyph position: GPOS) of GLYPH in
displayed string. GPOS is different from CHARPOS.
CHARPOS is the position of glyph in internal string
object. A mode line string format has structures which
is converted to a flatten by emacs lisp interpreter.
The internal string is an element of the structures.
The displayed string is the flatten string. */
gpos = 0;
if (glyph > row_start_glyph)
{
tmp_glyph = glyph - 1;
while (tmp_glyph >= row_start_glyph
&& tmp_glyph->charpos >= XINT (b)
&& EQ (tmp_glyph->object, glyph->object))
{
tmp_glyph--;
gpos++;
}
}
/* Calculate the lenght(glyph sequence length: GSEQ_LENGTH) of
displayed string holding GLYPH.
GSEQ_LENGTH is different from SCHARS (STRING).
SCHARS (STRING) returns the length of the internal string. */
for (tmp_glyph = glyph, gseq_length = gpos;
tmp_glyph->charpos < XINT (e);
tmp_glyph++, gseq_length++)
{
if (!EQ (tmp_glyph->object, glyph->object))
break;
}
total_pixel_width = 0;
for (tmp_glyph = glyph - gpos; tmp_glyph != glyph; tmp_glyph++)
total_pixel_width += tmp_glyph->pixel_width;
/* Pre calculation of re-rendering position */
vpos = (x - gpos);
hpos = (area == ON_MODE_LINE
? (w->current_matrix)->nrows - 1
: 0);
/* If the re-rendering position is included in the last
re-rendering area, we should do nothing. */
if ( EQ (window, dpyinfo->mouse_face_window)
&& dpyinfo->mouse_face_beg_col <= vpos
&& vpos < dpyinfo->mouse_face_end_col
&& dpyinfo->mouse_face_beg_row == hpos )
return;
if (clear_mouse_face (dpyinfo))
cursor = No_Cursor;
dpyinfo->mouse_face_beg_col = vpos;
dpyinfo->mouse_face_beg_row = hpos;
dpyinfo->mouse_face_beg_x = original_x_pixel - (total_pixel_width + dx);
dpyinfo->mouse_face_beg_y = 0;
dpyinfo->mouse_face_end_col = vpos + gseq_length;
dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_beg_row;
dpyinfo->mouse_face_end_x = 0;
dpyinfo->mouse_face_end_y = 0;
dpyinfo->mouse_face_past_end = 0;
dpyinfo->mouse_face_window = window;
dpyinfo->mouse_face_face_id = face_at_string_position (w, string,
charpos,
0, 0, 0, &ignore,
glyph->face_id, 1);
show_mouse_face (dpyinfo, DRAW_MOUSE_FACE);
if (NILP (pointer))
pointer = Qhand;
}
else if ((area == ON_MODE_LINE) || (area == ON_HEADER_LINE))
clear_mouse_face (dpyinfo);
}
define_frame_cursor1 (f, cursor, pointer);
}
/* EXPORT:
Take proper action when the mouse has moved to position X, Y on
frame F as regards highlighting characters that have mouse-face
properties. Also de-highlighting chars where the mouse was before.
X and Y can be negative or out of range. */
void
note_mouse_highlight (f, x, y)
struct frame *f;
int x, y;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
enum window_part part;
Lisp_Object window;
struct window *w;
Cursor cursor = No_Cursor;
Lisp_Object pointer = Qnil; /* Takes precedence over cursor! */
struct buffer *b;
/* When a menu is active, don't highlight because this looks odd. */
#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NS)
if (popup_activated ())
return;
#endif
if (NILP (Vmouse_highlight)
|| !f->glyphs_initialized_p
|| f->pointer_invisible)
return;
dpyinfo->mouse_face_mouse_x = x;
dpyinfo->mouse_face_mouse_y = y;
dpyinfo->mouse_face_mouse_frame = f;
if (dpyinfo->mouse_face_defer)
return;
if (gc_in_progress)
{
dpyinfo->mouse_face_deferred_gc = 1;
return;
}
/* Which window is that in? */
window = window_from_coordinates (f, x, y, &part, 0, 0, 1);
/* If we were displaying active text in another window, clear that.
Also clear if we move out of text area in same window. */
if (! EQ (window, dpyinfo->mouse_face_window)
|| (part != ON_TEXT && part != ON_MODE_LINE && part != ON_HEADER_LINE
&& !NILP (dpyinfo->mouse_face_window)))
clear_mouse_face (dpyinfo);
/* Not on a window -> return. */
if (!WINDOWP (window))
return;
/* Reset help_echo_string. It will get recomputed below. */
help_echo_string = Qnil;
/* Convert to window-relative pixel coordinates. */
w = XWINDOW (window);
frame_to_window_pixel_xy (w, &x, &y);
/* Handle tool-bar window differently since it doesn't display a
buffer. */
if (EQ (window, f->tool_bar_window))
{
note_tool_bar_highlight (f, x, y);
return;
}
/* Mouse is on the mode, header line or margin? */
if (part == ON_MODE_LINE || part == ON_HEADER_LINE
|| part == ON_LEFT_MARGIN || part == ON_RIGHT_MARGIN)
{
note_mode_line_or_margin_highlight (window, x, y, part);
return;
}
if (part == ON_VERTICAL_BORDER)
{
cursor = FRAME_X_OUTPUT (f)->horizontal_drag_cursor;
help_echo_string = build_string ("drag-mouse-1: resize");
}
else if (part == ON_LEFT_FRINGE || part == ON_RIGHT_FRINGE
|| part == ON_SCROLL_BAR)
cursor = FRAME_X_OUTPUT (f)->nontext_cursor;
else
cursor = FRAME_X_OUTPUT (f)->text_cursor;
/* Are we in a window whose display is up to date?
And verify the buffer's text has not changed. */
b = XBUFFER (w->buffer);
if (part == ON_TEXT
&& EQ (w->window_end_valid, w->buffer)
&& XFASTINT (w->last_modified) == BUF_MODIFF (b)
&& XFASTINT (w->last_overlay_modified) == BUF_OVERLAY_MODIFF (b))
{
int hpos, vpos, pos, i, dx, dy, area;
struct glyph *glyph;
Lisp_Object object;
Lisp_Object mouse_face = Qnil, overlay = Qnil, position;
Lisp_Object *overlay_vec = NULL;
int noverlays;
struct buffer *obuf;
int obegv, ozv, same_region;
/* Find the glyph under X/Y. */
glyph = x_y_to_hpos_vpos (w, x, y, &hpos, &vpos, &dx, &dy, &area);
/* Look for :pointer property on image. */
if (glyph != NULL && glyph->type == IMAGE_GLYPH)
{
struct image *img = IMAGE_FROM_ID (f, glyph->u.img_id);
if (img != NULL && IMAGEP (img->spec))
{
Lisp_Object image_map, hotspot;
if ((image_map = Fplist_get (XCDR (img->spec), QCmap),
!NILP (image_map))
&& (hotspot = find_hot_spot (image_map,
glyph->slice.x + dx,
glyph->slice.y + dy),
CONSP (hotspot))
&& (hotspot = XCDR (hotspot), CONSP (hotspot)))
{
Lisp_Object area_id, plist;
area_id = XCAR (hotspot);
/* Could check AREA_ID to see if we enter/leave this hot-spot.
If so, we could look for mouse-enter, mouse-leave
properties in PLIST (and do something...). */
hotspot = XCDR (hotspot);
if (CONSP (hotspot)
&& (plist = XCAR (hotspot), CONSP (plist)))
{
pointer = Fplist_get (plist, Qpointer);
if (NILP (pointer))
pointer = Qhand;
help_echo_string = Fplist_get (plist, Qhelp_echo);
if (!NILP (help_echo_string))
{
help_echo_window = window;
help_echo_object = glyph->object;
help_echo_pos = glyph->charpos;
}
}
}
if (NILP (pointer))
pointer = Fplist_get (XCDR (img->spec), QCpointer);
}
}
/* Clear mouse face if X/Y not over text. */
if (glyph == NULL
|| area != TEXT_AREA
|| !MATRIX_ROW (w->current_matrix, vpos)->displays_text_p)
{
if (clear_mouse_face (dpyinfo))
cursor = No_Cursor;
if (NILP (pointer))
{
if (area != TEXT_AREA)
cursor = FRAME_X_OUTPUT (f)->nontext_cursor;
else
pointer = Vvoid_text_area_pointer;
}
goto set_cursor;
}
pos = glyph->charpos;
object = glyph->object;
if (!STRINGP (object) && !BUFFERP (object))
goto set_cursor;
/* If we get an out-of-range value, return now; avoid an error. */
if (BUFFERP (object) && pos > BUF_Z (b))
goto set_cursor;
/* Make the window's buffer temporarily current for
overlays_at and compute_char_face. */
obuf = current_buffer;
current_buffer = b;
obegv = BEGV;
ozv = ZV;
BEGV = BEG;
ZV = Z;
/* Is this char mouse-active or does it have help-echo? */
position = make_number (pos);
if (BUFFERP (object))
{
/* Put all the overlays we want in a vector in overlay_vec. */
GET_OVERLAYS_AT (pos, overlay_vec, noverlays, NULL, 0);
/* Sort overlays into increasing priority order. */
noverlays = sort_overlays (overlay_vec, noverlays, w);
}
else
noverlays = 0;
same_region = (EQ (window, dpyinfo->mouse_face_window)
&& vpos >= dpyinfo->mouse_face_beg_row
&& vpos <= dpyinfo->mouse_face_end_row
&& (vpos > dpyinfo->mouse_face_beg_row
|| hpos >= dpyinfo->mouse_face_beg_col)
&& (vpos < dpyinfo->mouse_face_end_row
|| hpos < dpyinfo->mouse_face_end_col
|| dpyinfo->mouse_face_past_end));
if (same_region)
cursor = No_Cursor;
/* Check mouse-face highlighting. */
if (! same_region
/* If there exists an overlay with mouse-face overlapping
the one we are currently highlighting, we have to
check if we enter the overlapping overlay, and then
highlight only that. */
|| (OVERLAYP (dpyinfo->mouse_face_overlay)
&& mouse_face_overlay_overlaps (dpyinfo->mouse_face_overlay)))
{
/* Find the highest priority overlay with a mouse-face. */
overlay = Qnil;
for (i = noverlays - 1; i >= 0 && NILP (overlay); --i)
{
mouse_face = Foverlay_get (overlay_vec[i], Qmouse_face);
if (!NILP (mouse_face))
overlay = overlay_vec[i];
}
/* If we're highlighting the same overlay as before, there's
no need to do that again. */
if (!NILP (overlay) && EQ (overlay, dpyinfo->mouse_face_overlay))
goto check_help_echo;
dpyinfo->mouse_face_overlay = overlay;
/* Clear the display of the old active region, if any. */
if (clear_mouse_face (dpyinfo))
cursor = No_Cursor;
/* If no overlay applies, get a text property. */
if (NILP (overlay))
mouse_face = Fget_text_property (position, Qmouse_face, object);
/* Next, compute the bounds of the mouse highlighting and
display it. */
if (!NILP (mouse_face) && STRINGP (object))
{
/* The mouse-highlighting comes from a display string
with a mouse-face. */
Lisp_Object b, e;
EMACS_INT ignore;
b = Fprevious_single_property_change
(make_number (pos + 1), Qmouse_face, object, Qnil);
e = Fnext_single_property_change
(position, Qmouse_face, object, Qnil);
if (NILP (b))
b = make_number (0);
if (NILP (e))
e = make_number (SCHARS (object) - 1);
fast_find_string_pos (w, XINT (b), object,
&dpyinfo->mouse_face_beg_col,
&dpyinfo->mouse_face_beg_row,
&dpyinfo->mouse_face_beg_x,
&dpyinfo->mouse_face_beg_y, 0);
fast_find_string_pos (w, XINT (e), object,
&dpyinfo->mouse_face_end_col,
&dpyinfo->mouse_face_end_row,
&dpyinfo->mouse_face_end_x,
&dpyinfo->mouse_face_end_y, 1);
dpyinfo->mouse_face_past_end = 0;
dpyinfo->mouse_face_window = window;
dpyinfo->mouse_face_face_id
= face_at_string_position (w, object, pos, 0, 0, 0, &ignore,
glyph->face_id, 1);
show_mouse_face (dpyinfo, DRAW_MOUSE_FACE);
cursor = No_Cursor;
}
else
{
/* The mouse-highlighting, if any, comes from an overlay
or text property in the buffer. */
Lisp_Object buffer, display_string;
if (STRINGP (object))
{
/* If we are on a display string with no mouse-face,
check if the text under it has one. */
struct glyph_row *r = MATRIX_ROW (w->current_matrix, vpos);
int start = MATRIX_ROW_START_CHARPOS (r);
pos = string_buffer_position (w, object, start);
if (pos > 0)
{
mouse_face = get_char_property_and_overlay
(make_number (pos), Qmouse_face, w->buffer, &overlay);
buffer = w->buffer;
display_string = object;
}
}
else
{
buffer = object;
display_string = Qnil;
}
if (!NILP (mouse_face))
{
Lisp_Object before, after;
Lisp_Object before_string, after_string;
if (NILP (overlay))
{
/* Handle the text property case. */
before = Fprevious_single_property_change
(make_number (pos + 1), Qmouse_face, buffer,
Fmarker_position (w->start));
after = Fnext_single_property_change
(make_number (pos), Qmouse_face, buffer,
make_number (BUF_Z (XBUFFER (buffer))
- XFASTINT (w->window_end_pos)));
before_string = after_string = Qnil;
}
else
{
/* Handle the overlay case. */
before = Foverlay_start (overlay);
after = Foverlay_end (overlay);
before_string = Foverlay_get (overlay, Qbefore_string);
after_string = Foverlay_get (overlay, Qafter_string);
if (!STRINGP (before_string)) before_string = Qnil;
if (!STRINGP (after_string)) after_string = Qnil;
}
mouse_face_from_buffer_pos (window, dpyinfo, pos,
XFASTINT (before),
XFASTINT (after),
before_string, after_string,
display_string);
cursor = No_Cursor;
}
}
}
check_help_echo:
/* Look for a `help-echo' property. */
if (NILP (help_echo_string)) {
Lisp_Object help, overlay;
/* Check overlays first. */
help = overlay = Qnil;
for (i = noverlays - 1; i >= 0 && NILP (help); --i)
{
overlay = overlay_vec[i];
help = Foverlay_get (overlay, Qhelp_echo);
}
if (!NILP (help))
{
help_echo_string = help;
help_echo_window = window;
help_echo_object = overlay;
help_echo_pos = pos;
}
else
{
Lisp_Object object = glyph->object;
int charpos = glyph->charpos;
/* Try text properties. */
if (STRINGP (object)
&& charpos >= 0
&& charpos < SCHARS (object))
{
help = Fget_text_property (make_number (charpos),
Qhelp_echo, object);
if (NILP (help))
{
/* If the string itself doesn't specify a help-echo,
see if the buffer text ``under'' it does. */
struct glyph_row *r
= MATRIX_ROW (w->current_matrix, vpos);
int start = MATRIX_ROW_START_CHARPOS (r);
int pos = string_buffer_position (w, object, start);
if (pos > 0)
{
help = Fget_char_property (make_number (pos),
Qhelp_echo, w->buffer);
if (!NILP (help))
{
charpos = pos;
object = w->buffer;
}
}
}
}
else if (BUFFERP (object)
&& charpos >= BEGV
&& charpos < ZV)
help = Fget_text_property (make_number (charpos), Qhelp_echo,
object);
if (!NILP (help))
{
help_echo_string = help;
help_echo_window = window;
help_echo_object = object;
help_echo_pos = charpos;
}
}
}
/* Look for a `pointer' property. */
if (NILP (pointer))
{
/* Check overlays first. */
for (i = noverlays - 1; i >= 0 && NILP (pointer); --i)
pointer = Foverlay_get (overlay_vec[i], Qpointer);
if (NILP (pointer))
{
Lisp_Object object = glyph->object;
int charpos = glyph->charpos;
/* Try text properties. */
if (STRINGP (object)
&& charpos >= 0
&& charpos < SCHARS (object))
{
pointer = Fget_text_property (make_number (charpos),
Qpointer, object);
if (NILP (pointer))
{
/* If the string itself doesn't specify a pointer,
see if the buffer text ``under'' it does. */
struct glyph_row *r
= MATRIX_ROW (w->current_matrix, vpos);
int start = MATRIX_ROW_START_CHARPOS (r);
int pos = string_buffer_position (w, object, start);
if (pos > 0)
pointer = Fget_char_property (make_number (pos),
Qpointer, w->buffer);
}
}
else if (BUFFERP (object)
&& charpos >= BEGV
&& charpos < ZV)
pointer = Fget_text_property (make_number (charpos),
Qpointer, object);
}
}
BEGV = obegv;
ZV = ozv;
current_buffer = obuf;
}
set_cursor:
define_frame_cursor1 (f, cursor, pointer);
}
/* EXPORT for RIF:
Clear any mouse-face on window W. This function is part of the
redisplay interface, and is called from try_window_id and similar
functions to ensure the mouse-highlight is off. */
void
x_clear_window_mouse_face (w)
struct window *w;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (XFRAME (w->frame));
Lisp_Object window;
BLOCK_INPUT;
XSETWINDOW (window, w);
if (EQ (window, dpyinfo->mouse_face_window))
clear_mouse_face (dpyinfo);
UNBLOCK_INPUT;
}
/* EXPORT:
Just discard the mouse face information for frame F, if any.
This is used when the size of F is changed. */
void
cancel_mouse_face (f)
struct frame *f;
{
Lisp_Object window;
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
window = dpyinfo->mouse_face_window;
if (! NILP (window) && XFRAME (XWINDOW (window)->frame) == f)
{
dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
dpyinfo->mouse_face_window = Qnil;
}
}
#endif /* HAVE_WINDOW_SYSTEM */
/***********************************************************************
Exposure Events
***********************************************************************/
#ifdef HAVE_WINDOW_SYSTEM
/* Redraw the part of glyph row area AREA of glyph row ROW on window W
which intersects rectangle R. R is in window-relative coordinates. */
static void
expose_area (w, row, r, area)
struct window *w;
struct glyph_row *row;
XRectangle *r;
enum glyph_row_area area;
{
struct glyph *first = row->glyphs[area];
struct glyph *end = row->glyphs[area] + row->used[area];
struct glyph *last;
int first_x, start_x, x;
if (area == TEXT_AREA && row->fill_line_p)
/* If row extends face to end of line write the whole line. */
draw_glyphs (w, 0, row, area,
0, row->used[area],
DRAW_NORMAL_TEXT, 0);
else
{
/* Set START_X to the window-relative start position for drawing glyphs of
AREA. The first glyph of the text area can be partially visible.
The first glyphs of other areas cannot. */
start_x = window_box_left_offset (w, area);
x = start_x;
if (area == TEXT_AREA)
x += row->x;
/* Find the first glyph that must be redrawn. */
while (first < end
&& x + first->pixel_width < r->x)
{
x += first->pixel_width;
++first;
}
/* Find the last one. */
last = first;
first_x = x;
while (last < end
&& x < r->x + r->width)
{
x += last->pixel_width;
++last;
}
/* Repaint. */
if (last > first)
draw_glyphs (w, first_x - start_x, row, area,
first - row->glyphs[area], last - row->glyphs[area],
DRAW_NORMAL_TEXT, 0);
}
}
/* Redraw the parts of the glyph row ROW on window W intersecting
rectangle R. R is in window-relative coordinates. Value is
non-zero if mouse-face was overwritten. */
static int
expose_line (w, row, r)
struct window *w;
struct glyph_row *row;
XRectangle *r;
{
xassert (row->enabled_p);
if (row->mode_line_p || w->pseudo_window_p)
draw_glyphs (w, 0, row, TEXT_AREA,
0, row->used[TEXT_AREA],
DRAW_NORMAL_TEXT, 0);
else
{
if (row->used[LEFT_MARGIN_AREA])
expose_area (w, row, r, LEFT_MARGIN_AREA);
if (row->used[TEXT_AREA])
expose_area (w, row, r, TEXT_AREA);
if (row->used[RIGHT_MARGIN_AREA])
expose_area (w, row, r, RIGHT_MARGIN_AREA);
draw_row_fringe_bitmaps (w, row);
}
return row->mouse_face_p;
}
/* Redraw those parts of glyphs rows during expose event handling that
overlap other rows. Redrawing of an exposed line writes over parts
of lines overlapping that exposed line; this function fixes that.
W is the window being exposed. FIRST_OVERLAPPING_ROW is the first
row in W's current matrix that is exposed and overlaps other rows.
LAST_OVERLAPPING_ROW is the last such row. */
static void
expose_overlaps (w, first_overlapping_row, last_overlapping_row, r)
struct window *w;
struct glyph_row *first_overlapping_row;
struct glyph_row *last_overlapping_row;
XRectangle *r;
{
struct glyph_row *row;
for (row = first_overlapping_row; row <= last_overlapping_row; ++row)
if (row->overlapping_p)
{
xassert (row->enabled_p && !row->mode_line_p);
row->clip = r;
if (row->used[LEFT_MARGIN_AREA])
x_fix_overlapping_area (w, row, LEFT_MARGIN_AREA, OVERLAPS_BOTH);
if (row->used[TEXT_AREA])
x_fix_overlapping_area (w, row, TEXT_AREA, OVERLAPS_BOTH);
if (row->used[RIGHT_MARGIN_AREA])
x_fix_overlapping_area (w, row, RIGHT_MARGIN_AREA, OVERLAPS_BOTH);
row->clip = NULL;
}
}
/* Return non-zero if W's cursor intersects rectangle R. */
static int
phys_cursor_in_rect_p (w, r)
struct window *w;
XRectangle *r;
{
XRectangle cr, result;
struct glyph *cursor_glyph;
struct glyph_row *row;
if (w->phys_cursor.vpos >= 0
&& w->phys_cursor.vpos < w->current_matrix->nrows
&& (row = MATRIX_ROW (w->current_matrix, w->phys_cursor.vpos),
row->enabled_p)
&& row->cursor_in_fringe_p)
{
/* Cursor is in the fringe. */
cr.x = window_box_right_offset (w,
(WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
? RIGHT_MARGIN_AREA
: TEXT_AREA));
cr.y = row->y;
cr.width = WINDOW_RIGHT_FRINGE_WIDTH (w);
cr.height = row->height;
return x_intersect_rectangles (&cr, r, &result);
}
cursor_glyph = get_phys_cursor_glyph (w);
if (cursor_glyph)
{
/* r is relative to W's box, but w->phys_cursor.x is relative
to left edge of W's TEXT area. Adjust it. */
cr.x = window_box_left_offset (w, TEXT_AREA) + w->phys_cursor.x;
cr.y = w->phys_cursor.y;
cr.width = cursor_glyph->pixel_width;
cr.height = w->phys_cursor_height;
/* ++KFS: W32 version used W32-specific IntersectRect here, but
I assume the effect is the same -- and this is portable. */
return x_intersect_rectangles (&cr, r, &result);
}
/* If we don't understand the format, pretend we're not in the hot-spot. */
return 0;
}
/* EXPORT:
Draw a vertical window border to the right of window W if W doesn't
have vertical scroll bars. */
void
x_draw_vertical_border (w)
struct window *w;
{
struct frame *f = XFRAME (WINDOW_FRAME (w));
/* We could do better, if we knew what type of scroll-bar the adjacent
windows (on either side) have... But we don't :-(
However, I think this works ok. ++KFS 2003-04-25 */
/* Redraw borders between horizontally adjacent windows. Don't
do it for frames with vertical scroll bars because either the
right scroll bar of a window, or the left scroll bar of its
neighbor will suffice as a border. */
if (FRAME_HAS_VERTICAL_SCROLL_BARS (XFRAME (w->frame)))
return;
if (!WINDOW_RIGHTMOST_P (w)
&& !WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_RIGHT (w))
{
int x0, x1, y0, y1;
window_box_edges (w, -1, &x0, &y0, &x1, &y1);
y1 -= 1;
if (WINDOW_LEFT_FRINGE_WIDTH (w) == 0)
x1 -= 1;
FRAME_RIF (f)->draw_vertical_window_border (w, x1, y0, y1);
}
else if (!WINDOW_LEFTMOST_P (w)
&& !WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_LEFT (w))
{
int x0, x1, y0, y1;
window_box_edges (w, -1, &x0, &y0, &x1, &y1);
y1 -= 1;
if (WINDOW_LEFT_FRINGE_WIDTH (w) == 0)
x0 -= 1;
FRAME_RIF (f)->draw_vertical_window_border (w, x0, y0, y1);
}
}
/* Redraw the part of window W intersection rectangle FR. Pixel
coordinates in FR are frame-relative. Call this function with
input blocked. Value is non-zero if the exposure overwrites
mouse-face. */
static int
expose_window (w, fr)
struct window *w;
XRectangle *fr;
{
struct frame *f = XFRAME (w->frame);
XRectangle wr, r;
int mouse_face_overwritten_p = 0;
/* If window is not yet fully initialized, do nothing. This can
happen when toolkit scroll bars are used and a window is split.
Reconfiguring the scroll bar will generate an expose for a newly
created window. */
if (w->current_matrix == NULL)
return 0;
/* When we're currently updating the window, display and current
matrix usually don't agree. Arrange for a thorough display
later. */
if (w == updated_window)
{
SET_FRAME_GARBAGED (f);
return 0;
}
/* Frame-relative pixel rectangle of W. */
wr.x = WINDOW_LEFT_EDGE_X (w);
wr.y = WINDOW_TOP_EDGE_Y (w);
wr.width = WINDOW_TOTAL_WIDTH (w);
wr.height = WINDOW_TOTAL_HEIGHT (w);
if (x_intersect_rectangles (fr, &wr, &r))
{
int yb = window_text_bottom_y (w);
struct glyph_row *row;
int cursor_cleared_p;
struct glyph_row *first_overlapping_row, *last_overlapping_row;
TRACE ((stderr, "expose_window (%d, %d, %d, %d)\n",
r.x, r.y, r.width, r.height));
/* Convert to window coordinates. */
r.x -= WINDOW_LEFT_EDGE_X (w);
r.y -= WINDOW_TOP_EDGE_Y (w);
/* Turn off the cursor. */
if (!w->pseudo_window_p
&& phys_cursor_in_rect_p (w, &r))
{
x_clear_cursor (w);
cursor_cleared_p = 1;
}
else
cursor_cleared_p = 0;
/* Update lines intersecting rectangle R. */
first_overlapping_row = last_overlapping_row = NULL;
for (row = w->current_matrix->rows;
row->enabled_p;
++row)
{
int y0 = row->y;
int y1 = MATRIX_ROW_BOTTOM_Y (row);
if ((y0 >= r.y && y0 < r.y + r.height)
|| (y1 > r.y && y1 < r.y + r.height)
|| (r.y >= y0 && r.y < y1)
|| (r.y + r.height > y0 && r.y + r.height < y1))
{
/* A header line may be overlapping, but there is no need
to fix overlapping areas for them. KFS 2005-02-12 */
if (row->overlapping_p && !row->mode_line_p)
{
if (first_overlapping_row == NULL)
first_overlapping_row = row;
last_overlapping_row = row;
}
row->clip = fr;
if (expose_line (w, row, &r))
mouse_face_overwritten_p = 1;
row->clip = NULL;
}
else if (row->overlapping_p)
{
/* We must redraw a row overlapping the exposed area. */
if (y0 < r.y
? y0 + row->phys_height > r.y
: y0 + row->ascent - row->phys_ascent < r.y +r.height)
{
if (first_overlapping_row == NULL)
first_overlapping_row = row;
last_overlapping_row = row;
}
}
if (y1 >= yb)
break;
}
/* Display the mode line if there is one. */
if (WINDOW_WANTS_MODELINE_P (w)
&& (row = MATRIX_MODE_LINE_ROW (w->current_matrix),
row->enabled_p)
&& row->y < r.y + r.height)
{
if (expose_line (w, row, &r))
mouse_face_overwritten_p = 1;
}
if (!w->pseudo_window_p)
{
/* Fix the display of overlapping rows. */
if (first_overlapping_row)
expose_overlaps (w, first_overlapping_row, last_overlapping_row,
fr);
/* Draw border between windows. */
x_draw_vertical_border (w);
/* Turn the cursor on again. */
if (cursor_cleared_p)
update_window_cursor (w, 1);
}
}
return mouse_face_overwritten_p;
}
/* Redraw (parts) of all windows in the window tree rooted at W that
intersect R. R contains frame pixel coordinates. Value is
non-zero if the exposure overwrites mouse-face. */
static int
expose_window_tree (w, r)
struct window *w;
XRectangle *r;
{
struct frame *f = XFRAME (w->frame);
int mouse_face_overwritten_p = 0;
while (w && !FRAME_GARBAGED_P (f))
{
if (!NILP (w->hchild))
mouse_face_overwritten_p
|= expose_window_tree (XWINDOW (w->hchild), r);
else if (!NILP (w->vchild))
mouse_face_overwritten_p
|= expose_window_tree (XWINDOW (w->vchild), r);
else
mouse_face_overwritten_p |= expose_window (w, r);
w = NILP (w->next) ? NULL : XWINDOW (w->next);
}
return mouse_face_overwritten_p;
}
/* EXPORT:
Redisplay an exposed area of frame F. X and Y are the upper-left
corner of the exposed rectangle. W and H are width and height of
the exposed area. All are pixel values. W or H zero means redraw
the entire frame. */
void
expose_frame (f, x, y, w, h)
struct frame *f;
int x, y, w, h;
{
XRectangle r;
int mouse_face_overwritten_p = 0;
TRACE ((stderr, "expose_frame "));
/* No need to redraw if frame will be redrawn soon. */
if (FRAME_GARBAGED_P (f))
{
TRACE ((stderr, " garbaged\n"));
return;
}
/* If basic faces haven't been realized yet, there is no point in
trying to redraw anything. This can happen when we get an expose
event while Emacs is starting, e.g. by moving another window. */
if (FRAME_FACE_CACHE (f) == NULL
|| FRAME_FACE_CACHE (f)->used < BASIC_FACE_ID_SENTINEL)
{
TRACE ((stderr, " no faces\n"));
return;
}
if (w == 0 || h == 0)
{
r.x = r.y = 0;
r.width = FRAME_COLUMN_WIDTH (f) * FRAME_COLS (f);
r.height = FRAME_LINE_HEIGHT (f) * FRAME_LINES (f);
}
else
{
r.x = x;
r.y = y;
r.width = w;
r.height = h;
}
TRACE ((stderr, "(%d, %d, %d, %d)\n", r.x, r.y, r.width, r.height));
mouse_face_overwritten_p = expose_window_tree (XWINDOW (f->root_window), &r);
if (WINDOWP (f->tool_bar_window))
mouse_face_overwritten_p
|= expose_window (XWINDOW (f->tool_bar_window), &r);
#ifdef HAVE_X_WINDOWS
#ifndef MSDOS
#ifndef USE_X_TOOLKIT
if (WINDOWP (f->menu_bar_window))
mouse_face_overwritten_p
|= expose_window (XWINDOW (f->menu_bar_window), &r);
#endif /* not USE_X_TOOLKIT */
#endif
#endif
/* Some window managers support a focus-follows-mouse style with
delayed raising of frames. Imagine a partially obscured frame,
and moving the mouse into partially obscured mouse-face on that
frame. The visible part of the mouse-face will be highlighted,
then the WM raises the obscured frame. With at least one WM, KDE
2.1, Emacs is not getting any event for the raising of the frame
(even tried with SubstructureRedirectMask), only Expose events.
These expose events will draw text normally, i.e. not
highlighted. Which means we must redo the highlight here.
Subsume it under ``we love X''. --gerd 2001-08-15 */
/* Included in Windows version because Windows most likely does not
do the right thing if any third party tool offers
focus-follows-mouse with delayed raise. --jason 2001-10-12 */
if (mouse_face_overwritten_p && !FRAME_GARBAGED_P (f))
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
if (f == dpyinfo->mouse_face_mouse_frame)
{
int x = dpyinfo->mouse_face_mouse_x;
int y = dpyinfo->mouse_face_mouse_y;
clear_mouse_face (dpyinfo);
note_mouse_highlight (f, x, y);
}
}
}
/* EXPORT:
Determine the intersection of two rectangles R1 and R2. Return
the intersection in *RESULT. Value is non-zero if RESULT is not
empty. */
int
x_intersect_rectangles (r1, r2, result)
XRectangle *r1, *r2, *result;
{
XRectangle *left, *right;
XRectangle *upper, *lower;
int intersection_p = 0;
/* Rearrange so that R1 is the left-most rectangle. */
if (r1->x < r2->x)
left = r1, right = r2;
else
left = r2, right = r1;
/* X0 of the intersection is right.x0, if this is inside R1,
otherwise there is no intersection. */
if (right->x <= left->x + left->width)
{
result->x = right->x;
/* The right end of the intersection is the minimum of the
the right ends of left and right. */
result->width = (min (left->x + left->width, right->x + right->width)
- result->x);
/* Same game for Y. */
if (r1->y < r2->y)
upper = r1, lower = r2;
else
upper = r2, lower = r1;
/* The upper end of the intersection is lower.y0, if this is inside
of upper. Otherwise, there is no intersection. */
if (lower->y <= upper->y + upper->height)
{
result->y = lower->y;
/* The lower end of the intersection is the minimum of the lower
ends of upper and lower. */
result->height = (min (lower->y + lower->height,
upper->y + upper->height)
- result->y);
intersection_p = 1;
}
}
return intersection_p;
}
#endif /* HAVE_WINDOW_SYSTEM */
/***********************************************************************
Initialization
***********************************************************************/
void
syms_of_xdisp ()
{
Vwith_echo_area_save_vector = Qnil;
staticpro (&Vwith_echo_area_save_vector);
Vmessage_stack = Qnil;
staticpro (&Vmessage_stack);
Qinhibit_redisplay = intern_c_string ("inhibit-redisplay");
staticpro (&Qinhibit_redisplay);
message_dolog_marker1 = Fmake_marker ();
staticpro (&message_dolog_marker1);
message_dolog_marker2 = Fmake_marker ();
staticpro (&message_dolog_marker2);
message_dolog_marker3 = Fmake_marker ();
staticpro (&message_dolog_marker3);
#if GLYPH_DEBUG
defsubr (&Sdump_frame_glyph_matrix);
defsubr (&Sdump_glyph_matrix);
defsubr (&Sdump_glyph_row);
defsubr (&Sdump_tool_bar_row);
defsubr (&Strace_redisplay);
defsubr (&Strace_to_stderr);
#endif
#ifdef HAVE_WINDOW_SYSTEM
defsubr (&Stool_bar_lines_needed);
defsubr (&Slookup_image_map);
#endif
defsubr (&Sformat_mode_line);
defsubr (&Sinvisible_p);
staticpro (&Qmenu_bar_update_hook);
Qmenu_bar_update_hook = intern_c_string ("menu-bar-update-hook");
staticpro (&Qoverriding_terminal_local_map);
Qoverriding_terminal_local_map = intern_c_string ("overriding-terminal-local-map");
staticpro (&Qoverriding_local_map);
Qoverriding_local_map = intern_c_string ("overriding-local-map");
staticpro (&Qwindow_scroll_functions);
Qwindow_scroll_functions = intern_c_string ("window-scroll-functions");
staticpro (&Qwindow_text_change_functions);
Qwindow_text_change_functions = intern_c_string ("window-text-change-functions");
staticpro (&Qredisplay_end_trigger_functions);
Qredisplay_end_trigger_functions = intern_c_string ("redisplay-end-trigger-functions");
staticpro (&Qinhibit_point_motion_hooks);
Qinhibit_point_motion_hooks = intern_c_string ("inhibit-point-motion-hooks");
Qeval = intern_c_string ("eval");
staticpro (&Qeval);
QCdata = intern_c_string (":data");
staticpro (&QCdata);
Qdisplay = intern_c_string ("display");
staticpro (&Qdisplay);
Qspace_width = intern_c_string ("space-width");
staticpro (&Qspace_width);
Qraise = intern_c_string ("raise");
staticpro (&Qraise);
Qslice = intern_c_string ("slice");
staticpro (&Qslice);
Qspace = intern_c_string ("space");
staticpro (&Qspace);
Qmargin = intern_c_string ("margin");
staticpro (&Qmargin);
Qpointer = intern_c_string ("pointer");
staticpro (&Qpointer);
Qleft_margin = intern_c_string ("left-margin");
staticpro (&Qleft_margin);
Qright_margin = intern_c_string ("right-margin");
staticpro (&Qright_margin);
Qcenter = intern_c_string ("center");
staticpro (&Qcenter);
Qline_height = intern_c_string ("line-height");
staticpro (&Qline_height);
QCalign_to = intern_c_string (":align-to");
staticpro (&QCalign_to);
QCrelative_width = intern_c_string (":relative-width");
staticpro (&QCrelative_width);
QCrelative_height = intern_c_string (":relative-height");
staticpro (&QCrelative_height);
QCeval = intern_c_string (":eval");
staticpro (&QCeval);
QCpropertize = intern_c_string (":propertize");
staticpro (&QCpropertize);
QCfile = intern_c_string (":file");
staticpro (&QCfile);
Qfontified = intern_c_string ("fontified");
staticpro (&Qfontified);
Qfontification_functions = intern_c_string ("fontification-functions");
staticpro (&Qfontification_functions);
Qtrailing_whitespace = intern_c_string ("trailing-whitespace");
staticpro (&Qtrailing_whitespace);
Qescape_glyph = intern_c_string ("escape-glyph");
staticpro (&Qescape_glyph);
Qnobreak_space = intern_c_string ("nobreak-space");
staticpro (&Qnobreak_space);
Qimage = intern_c_string ("image");
staticpro (&Qimage);
QCmap = intern_c_string (":map");
staticpro (&QCmap);
QCpointer = intern_c_string (":pointer");
staticpro (&QCpointer);
Qrect = intern_c_string ("rect");
staticpro (&Qrect);
Qcircle = intern_c_string ("circle");
staticpro (&Qcircle);
Qpoly = intern_c_string ("poly");
staticpro (&Qpoly);
Qmessage_truncate_lines = intern_c_string ("message-truncate-lines");
staticpro (&Qmessage_truncate_lines);
Qgrow_only = intern_c_string ("grow-only");
staticpro (&Qgrow_only);
Qinhibit_menubar_update = intern_c_string ("inhibit-menubar-update");
staticpro (&Qinhibit_menubar_update);
Qinhibit_eval_during_redisplay = intern_c_string ("inhibit-eval-during-redisplay");
staticpro (&Qinhibit_eval_during_redisplay);
Qposition = intern_c_string ("position");
staticpro (&Qposition);
Qbuffer_position = intern_c_string ("buffer-position");
staticpro (&Qbuffer_position);
Qobject = intern_c_string ("object");
staticpro (&Qobject);
Qbar = intern_c_string ("bar");
staticpro (&Qbar);
Qhbar = intern_c_string ("hbar");
staticpro (&Qhbar);
Qbox = intern_c_string ("box");
staticpro (&Qbox);
Qhollow = intern_c_string ("hollow");
staticpro (&Qhollow);
Qhand = intern_c_string ("hand");
staticpro (&Qhand);
Qarrow = intern_c_string ("arrow");
staticpro (&Qarrow);
Qtext = intern_c_string ("text");
staticpro (&Qtext);
Qrisky_local_variable = intern_c_string ("risky-local-variable");
staticpro (&Qrisky_local_variable);
Qinhibit_free_realized_faces = intern_c_string ("inhibit-free-realized-faces");
staticpro (&Qinhibit_free_realized_faces);
list_of_error = Fcons (Fcons (intern_c_string ("error"),
Fcons (intern_c_string ("void-variable"), Qnil)),
Qnil);
staticpro (&list_of_error);
Qlast_arrow_position = intern_c_string ("last-arrow-position");
staticpro (&Qlast_arrow_position);
Qlast_arrow_string = intern_c_string ("last-arrow-string");
staticpro (&Qlast_arrow_string);
Qoverlay_arrow_string = intern_c_string ("overlay-arrow-string");
staticpro (&Qoverlay_arrow_string);
Qoverlay_arrow_bitmap = intern_c_string ("overlay-arrow-bitmap");
staticpro (&Qoverlay_arrow_bitmap);
echo_buffer[0] = echo_buffer[1] = Qnil;
staticpro (&echo_buffer[0]);
staticpro (&echo_buffer[1]);
echo_area_buffer[0] = echo_area_buffer[1] = Qnil;
staticpro (&echo_area_buffer[0]);
staticpro (&echo_area_buffer[1]);
Vmessages_buffer_name = make_pure_c_string ("*Messages*");
staticpro (&Vmessages_buffer_name);
mode_line_proptrans_alist = Qnil;
staticpro (&mode_line_proptrans_alist);
mode_line_string_list = Qnil;
staticpro (&mode_line_string_list);
mode_line_string_face = Qnil;
staticpro (&mode_line_string_face);
mode_line_string_face_prop = Qnil;
staticpro (&mode_line_string_face_prop);
Vmode_line_unwind_vector = Qnil;
staticpro (&Vmode_line_unwind_vector);
help_echo_string = Qnil;
staticpro (&help_echo_string);
help_echo_object = Qnil;
staticpro (&help_echo_object);
help_echo_window = Qnil;
staticpro (&help_echo_window);
previous_help_echo_string = Qnil;
staticpro (&previous_help_echo_string);
help_echo_pos = -1;
#ifdef HAVE_WINDOW_SYSTEM
DEFVAR_BOOL ("x-stretch-cursor", &x_stretch_cursor_p,
doc: /* *Non-nil means draw block cursor as wide as the glyph under it.
For example, if a block cursor is over a tab, it will be drawn as
wide as that tab on the display. */);
x_stretch_cursor_p = 0;
#endif
DEFVAR_LISP ("show-trailing-whitespace", &Vshow_trailing_whitespace,
doc: /* *Non-nil means highlight trailing whitespace.
The face used for trailing whitespace is `trailing-whitespace'. */);
Vshow_trailing_whitespace = Qnil;
DEFVAR_LISP ("nobreak-char-display", &Vnobreak_char_display,
doc: /* *Control highlighting of nobreak space and soft hyphen.
A value of t means highlight the character itself (for nobreak space,
use face `nobreak-space').
A value of nil means no highlighting.
Other values mean display the escape glyph followed by an ordinary
space or ordinary hyphen. */);
Vnobreak_char_display = Qt;
DEFVAR_LISP ("void-text-area-pointer", &Vvoid_text_area_pointer,
doc: /* *The pointer shape to show in void text areas.
A value of nil means to show the text pointer. Other options are `arrow',
`text', `hand', `vdrag', `hdrag', `modeline', and `hourglass'. */);
Vvoid_text_area_pointer = Qarrow;
DEFVAR_LISP ("inhibit-redisplay", &Vinhibit_redisplay,
doc: /* Non-nil means don't actually do any redisplay.
This is used for internal purposes. */);
Vinhibit_redisplay = Qnil;
DEFVAR_LISP ("global-mode-string", &Vglobal_mode_string,
doc: /* String (or mode line construct) included (normally) in `mode-line-format'. */);
Vglobal_mode_string = Qnil;
DEFVAR_LISP ("overlay-arrow-position", &Voverlay_arrow_position,
doc: /* Marker for where to display an arrow on top of the buffer text.
This must be the beginning of a line in order to work.
See also `overlay-arrow-string'. */);
Voverlay_arrow_position = Qnil;
DEFVAR_LISP ("overlay-arrow-string", &Voverlay_arrow_string,
doc: /* String to display as an arrow in non-window frames.
See also `overlay-arrow-position'. */);
Voverlay_arrow_string = make_pure_c_string ("=>");
DEFVAR_LISP ("overlay-arrow-variable-list", &Voverlay_arrow_variable_list,
doc: /* List of variables (symbols) which hold markers for overlay arrows.
The symbols on this list are examined during redisplay to determine
where to display overlay arrows. */);
Voverlay_arrow_variable_list
= Fcons (intern_c_string ("overlay-arrow-position"), Qnil);
DEFVAR_INT ("scroll-step", &scroll_step,
doc: /* *The number of lines to try scrolling a window by when point moves out.
If that fails to bring point back on frame, point is centered instead.
If this is zero, point is always centered after it moves off frame.
If you want scrolling to always be a line at a time, you should set
`scroll-conservatively' to a large value rather than set this to 1. */);
DEFVAR_INT ("scroll-conservatively", &scroll_conservatively,
doc: /* *Scroll up to this many lines, to bring point back on screen.
If point moves off-screen, redisplay will scroll by up to
`scroll-conservatively' lines in order to bring point just barely
onto the screen again. If that cannot be done, then redisplay
recenters point as usual.
A value of zero means always recenter point if it moves off screen. */);
scroll_conservatively = 0;
DEFVAR_INT ("scroll-margin", &scroll_margin,
doc: /* *Number of lines of margin at the top and bottom of a window.
Recenter the window whenever point gets within this many lines
of the top or bottom of the window. */);
scroll_margin = 0;
DEFVAR_LISP ("display-pixels-per-inch", &Vdisplay_pixels_per_inch,
doc: /* Pixels per inch value for non-window system displays.
Value is a number or a cons (WIDTH-DPI . HEIGHT-DPI). */);
Vdisplay_pixels_per_inch = make_float (72.0);
#if GLYPH_DEBUG
DEFVAR_INT ("debug-end-pos", &debug_end_pos, doc: /* Don't ask. */);
#endif
DEFVAR_LISP ("truncate-partial-width-windows",
&Vtruncate_partial_width_windows,
doc: /* Non-nil means truncate lines in windows narrower than the frame.
For an integer value, truncate lines in each window narrower than the
full frame width, provided the window width is less than that integer;
otherwise, respect the value of `truncate-lines'.
For any other non-nil value, truncate lines in all windows that do
not span the full frame width.
A value of nil means to respect the value of `truncate-lines'.
If `word-wrap' is enabled, you might want to reduce this. */);
Vtruncate_partial_width_windows = make_number (50);
DEFVAR_BOOL ("mode-line-inverse-video", &mode_line_inverse_video,
doc: /* When nil, display the mode-line/header-line/menu-bar in the default face.
Any other value means to use the appropriate face, `mode-line',
`header-line', or `menu' respectively. */);
mode_line_inverse_video = 1;
DEFVAR_LISP ("line-number-display-limit", &Vline_number_display_limit,
doc: /* *Maximum buffer size for which line number should be displayed.
If the buffer is bigger than this, the line number does not appear
in the mode line. A value of nil means no limit. */);
Vline_number_display_limit = Qnil;
DEFVAR_INT ("line-number-display-limit-width",
&line_number_display_limit_width,
doc: /* *Maximum line width (in characters) for line number display.
If the average length of the lines near point is bigger than this, then the
line number may be omitted from the mode line. */);
line_number_display_limit_width = 200;
DEFVAR_BOOL ("highlight-nonselected-windows", &highlight_nonselected_windows,
doc: /* *Non-nil means highlight region even in nonselected windows. */);
highlight_nonselected_windows = 0;
DEFVAR_BOOL ("multiple-frames", &multiple_frames,
doc: /* Non-nil if more than one frame is visible on this display.
Minibuffer-only frames don't count, but iconified frames do.
This variable is not guaranteed to be accurate except while processing
`frame-title-format' and `icon-title-format'. */);
DEFVAR_LISP ("frame-title-format", &Vframe_title_format,
doc: /* Template for displaying the title bar of visible frames.
\(Assuming the window manager supports this feature.)
This variable has the same structure as `mode-line-format', except that
the %c and %l constructs are ignored. It is used only on frames for
which no explicit name has been set \(see `modify-frame-parameters'). */);
DEFVAR_LISP ("icon-title-format", &Vicon_title_format,
doc: /* Template for displaying the title bar of an iconified frame.
\(Assuming the window manager supports this feature.)
This variable has the same structure as `mode-line-format' (which see),
and is used only on frames for which no explicit name has been set
\(see `modify-frame-parameters'). */);
Vicon_title_format
= Vframe_title_format
= pure_cons (intern_c_string ("multiple-frames"),
pure_cons (make_pure_c_string ("%b"),
pure_cons (pure_cons (empty_unibyte_string,
pure_cons (intern_c_string ("invocation-name"),
pure_cons (make_pure_c_string ("@"),
pure_cons (intern_c_string ("system-name"),
Qnil)))),
Qnil)));
DEFVAR_LISP ("message-log-max", &Vmessage_log_max,
doc: /* Maximum number of lines to keep in the message log buffer.
If nil, disable message logging. If t, log messages but don't truncate
the buffer when it becomes large. */);
Vmessage_log_max = make_number (100);
DEFVAR_LISP ("window-size-change-functions", &Vwindow_size_change_functions,
doc: /* Functions called before redisplay, if window sizes have changed.
The value should be a list of functions that take one argument.
Just before redisplay, for each frame, if any of its windows have changed
size since the last redisplay, or have been split or deleted,
all the functions in the list are called, with the frame as argument. */);
Vwindow_size_change_functions = Qnil;
DEFVAR_LISP ("window-scroll-functions", &Vwindow_scroll_functions,
doc: /* List of functions to call before redisplaying a window with scrolling.
Each function is called with two arguments, the window and its new
display-start position. Note that these functions are also called by
`set-window-buffer'. Also note that the value of `window-end' is not
valid when these functions are called. */);
Vwindow_scroll_functions = Qnil;
DEFVAR_LISP ("window-text-change-functions",
&Vwindow_text_change_functions,
doc: /* Functions to call in redisplay when text in the window might change. */);
Vwindow_text_change_functions = Qnil;
DEFVAR_LISP ("redisplay-end-trigger-functions", &Vredisplay_end_trigger_functions,
doc: /* Functions called when redisplay of a window reaches the end trigger.
Each function is called with two arguments, the window and the end trigger value.
See `set-window-redisplay-end-trigger'. */);
Vredisplay_end_trigger_functions = Qnil;
DEFVAR_LISP ("mouse-autoselect-window", &Vmouse_autoselect_window,
doc: /* *Non-nil means autoselect window with mouse pointer.
If nil, do not autoselect windows.
A positive number means delay autoselection by that many seconds: a
window is autoselected only after the mouse has remained in that
window for the duration of the delay.
A negative number has a similar effect, but causes windows to be
autoselected only after the mouse has stopped moving. \(Because of
the way Emacs compares mouse events, you will occasionally wait twice
that time before the window gets selected.\)
Any other value means to autoselect window instantaneously when the
mouse pointer enters it.
Autoselection selects the minibuffer only if it is active, and never
unselects the minibuffer if it is active.
When customizing this variable make sure that the actual value of
`focus-follows-mouse' matches the behavior of your window manager. */);
Vmouse_autoselect_window = Qnil;
DEFVAR_LISP ("auto-resize-tool-bars", &Vauto_resize_tool_bars,
doc: /* *Non-nil means automatically resize tool-bars.
This dynamically changes the tool-bar's height to the minimum height
that is needed to make all tool-bar items visible.
If value is `grow-only', the tool-bar's height is only increased
automatically; to decrease the tool-bar height, use \\[recenter]. */);
Vauto_resize_tool_bars = Qt;
DEFVAR_BOOL ("auto-raise-tool-bar-buttons", &auto_raise_tool_bar_buttons_p,
doc: /* *Non-nil means raise tool-bar buttons when the mouse moves over them. */);
auto_raise_tool_bar_buttons_p = 1;
DEFVAR_BOOL ("make-cursor-line-fully-visible", &make_cursor_line_fully_visible_p,
doc: /* *Non-nil means to scroll (recenter) cursor line if it is not fully visible. */);
make_cursor_line_fully_visible_p = 1;
DEFVAR_LISP ("tool-bar-border", &Vtool_bar_border,
doc: /* *Border below tool-bar in pixels.
If an integer, use it as the height of the border.
If it is one of `internal-border-width' or `border-width', use the
value of the corresponding frame parameter.
Otherwise, no border is added below the tool-bar. */);
Vtool_bar_border = Qinternal_border_width;
DEFVAR_LISP ("tool-bar-button-margin", &Vtool_bar_button_margin,
doc: /* *Margin around tool-bar buttons in pixels.
If an integer, use that for both horizontal and vertical margins.
Otherwise, value should be a pair of integers `(HORZ . VERT)' with
HORZ specifying the horizontal margin, and VERT specifying the
vertical margin. */);
Vtool_bar_button_margin = make_number (DEFAULT_TOOL_BAR_BUTTON_MARGIN);
DEFVAR_INT ("tool-bar-button-relief", &tool_bar_button_relief,
doc: /* *Relief thickness of tool-bar buttons. */);
tool_bar_button_relief = DEFAULT_TOOL_BAR_BUTTON_RELIEF;
DEFVAR_LISP ("fontification-functions", &Vfontification_functions,
doc: /* List of functions to call to fontify regions of text.
Each function is called with one argument POS. Functions must
fontify a region starting at POS in the current buffer, and give
fontified regions the property `fontified'. */);
Vfontification_functions = Qnil;
Fmake_variable_buffer_local (Qfontification_functions);
DEFVAR_BOOL ("unibyte-display-via-language-environment",
&unibyte_display_via_language_environment,
doc: /* *Non-nil means display unibyte text according to language environment.
Specifically, this means that raw bytes in the range 160-255 decimal
are displayed by converting them to the equivalent multibyte characters
according to the current language environment. As a result, they are
displayed according to the current fontset.
Note that this variable affects only how these bytes are displayed,
but does not change the fact they are interpreted as raw bytes. */);
unibyte_display_via_language_environment = 0;
DEFVAR_LISP ("max-mini-window-height", &Vmax_mini_window_height,
doc: /* *Maximum height for resizing mini-windows.
If a float, it specifies a fraction of the mini-window frame's height.
If an integer, it specifies a number of lines. */);
Vmax_mini_window_height = make_float (0.25);
DEFVAR_LISP ("resize-mini-windows", &Vresize_mini_windows,
doc: /* *How to resize mini-windows.
A value of nil means don't automatically resize mini-windows.
A value of t means resize them to fit the text displayed in them.
A value of `grow-only', the default, means let mini-windows grow
only, until their display becomes empty, at which point the windows
go back to their normal size. */);
Vresize_mini_windows = Qgrow_only;
DEFVAR_LISP ("blink-cursor-alist", &Vblink_cursor_alist,
doc: /* Alist specifying how to blink the cursor off.
Each element has the form (ON-STATE . OFF-STATE). Whenever the
`cursor-type' frame-parameter or variable equals ON-STATE,
comparing using `equal', Emacs uses OFF-STATE to specify
how to blink it off. ON-STATE and OFF-STATE are values for
the `cursor-type' frame parameter.
If a frame's ON-STATE has no entry in this list,
the frame's other specifications determine how to blink the cursor off. */);
Vblink_cursor_alist = Qnil;
DEFVAR_BOOL ("auto-hscroll-mode", &automatic_hscrolling_p,
doc: /* *Non-nil means scroll the display automatically to make point visible. */);
automatic_hscrolling_p = 1;
Qauto_hscroll_mode = intern_c_string ("auto-hscroll-mode");
staticpro (&Qauto_hscroll_mode);
DEFVAR_INT ("hscroll-margin", &hscroll_margin,
doc: /* *How many columns away from the window edge point is allowed to get
before automatic hscrolling will horizontally scroll the window. */);
hscroll_margin = 5;
DEFVAR_LISP ("hscroll-step", &Vhscroll_step,
doc: /* *How many columns to scroll the window when point gets too close to the edge.
When point is less than `hscroll-margin' columns from the window
edge, automatic hscrolling will scroll the window by the amount of columns
determined by this variable. If its value is a positive integer, scroll that
many columns. If it's a positive floating-point number, it specifies the
fraction of the window's width to scroll. If it's nil or zero, point will be
centered horizontally after the scroll. Any other value, including negative
numbers, are treated as if the value were zero.
Automatic hscrolling always moves point outside the scroll margin, so if
point was more than scroll step columns inside the margin, the window will
scroll more than the value given by the scroll step.
Note that the lower bound for automatic hscrolling specified by `scroll-left'
and `scroll-right' overrides this variable's effect. */);
Vhscroll_step = make_number (0);
DEFVAR_BOOL ("message-truncate-lines", &message_truncate_lines,
doc: /* If non-nil, messages are truncated instead of resizing the echo area.
Bind this around calls to `message' to let it take effect. */);
message_truncate_lines = 0;
DEFVAR_LISP ("menu-bar-update-hook", &Vmenu_bar_update_hook,
doc: /* Normal hook run to update the menu bar definitions.
Redisplay runs this hook before it redisplays the menu bar.
This is used to update submenus such as Buffers,
whose contents depend on various data. */);
Vmenu_bar_update_hook = Qnil;
DEFVAR_LISP ("menu-updating-frame", &Vmenu_updating_frame,
doc: /* Frame for which we are updating a menu.
The enable predicate for a menu binding should check this variable. */);
Vmenu_updating_frame = Qnil;
DEFVAR_BOOL ("inhibit-menubar-update", &inhibit_menubar_update,
doc: /* Non-nil means don't update menu bars. Internal use only. */);
inhibit_menubar_update = 0;
DEFVAR_LISP ("wrap-prefix", &Vwrap_prefix,
doc: /* Prefix prepended to all continuation lines at display time.
The value may be a string, an image, or a stretch-glyph; it is
interpreted in the same way as the value of a `display' text property.
This variable is overridden by any `wrap-prefix' text or overlay
property.
To add a prefix to non-continuation lines, use `line-prefix'. */);
Vwrap_prefix = Qnil;
staticpro (&Qwrap_prefix);
Qwrap_prefix = intern_c_string ("wrap-prefix");
Fmake_variable_buffer_local (Qwrap_prefix);
DEFVAR_LISP ("line-prefix", &Vline_prefix,
doc: /* Prefix prepended to all non-continuation lines at display time.
The value may be a string, an image, or a stretch-glyph; it is
interpreted in the same way as the value of a `display' text property.
This variable is overridden by any `line-prefix' text or overlay
property.
To add a prefix to continuation lines, use `wrap-prefix'. */);
Vline_prefix = Qnil;
staticpro (&Qline_prefix);
Qline_prefix = intern_c_string ("line-prefix");
Fmake_variable_buffer_local (Qline_prefix);
DEFVAR_BOOL ("inhibit-eval-during-redisplay", &inhibit_eval_during_redisplay,
doc: /* Non-nil means don't eval Lisp during redisplay. */);
inhibit_eval_during_redisplay = 0;
DEFVAR_BOOL ("inhibit-free-realized-faces", &inhibit_free_realized_faces,
doc: /* Non-nil means don't free realized faces. Internal use only. */);
inhibit_free_realized_faces = 0;
#if GLYPH_DEBUG
DEFVAR_BOOL ("inhibit-try-window-id", &inhibit_try_window_id,
doc: /* Inhibit try_window_id display optimization. */);
inhibit_try_window_id = 0;
DEFVAR_BOOL ("inhibit-try-window-reusing", &inhibit_try_window_reusing,
doc: /* Inhibit try_window_reusing display optimization. */);
inhibit_try_window_reusing = 0;
DEFVAR_BOOL ("inhibit-try-cursor-movement", &inhibit_try_cursor_movement,
doc: /* Inhibit try_cursor_movement display optimization. */);
inhibit_try_cursor_movement = 0;
#endif /* GLYPH_DEBUG */
DEFVAR_INT ("overline-margin", &overline_margin,
doc: /* *Space between overline and text, in pixels.
The default value is 2: the height of the overline (1 pixel) plus 1 pixel
margin to the caracter height. */);
overline_margin = 2;
DEFVAR_INT ("underline-minimum-offset",
&underline_minimum_offset,
doc: /* Minimum distance between baseline and underline.
This can improve legibility of underlined text at small font sizes,
particularly when using variable `x-use-underline-position-properties'
with fonts that specify an UNDERLINE_POSITION relatively close to the
baseline. The default value is 1. */);
underline_minimum_offset = 1;
DEFVAR_BOOL ("display-hourglass", &display_hourglass_p,
doc: /* Non-zero means Emacs displays an hourglass pointer on window systems. */);
display_hourglass_p = 1;
DEFVAR_LISP ("hourglass-delay", &Vhourglass_delay,
doc: /* *Seconds to wait before displaying an hourglass pointer.
Value must be an integer or float. */);
Vhourglass_delay = make_number (DEFAULT_HOURGLASS_DELAY);
hourglass_atimer = NULL;
hourglass_shown_p = 0;
}
/* Initialize this module when Emacs starts. */
void
init_xdisp ()
{
Lisp_Object root_window;
struct window *mini_w;
current_header_line_height = current_mode_line_height = -1;
CHARPOS (this_line_start_pos) = 0;
mini_w = XWINDOW (minibuf_window);
root_window = FRAME_ROOT_WINDOW (XFRAME (WINDOW_FRAME (mini_w)));
if (!noninteractive)
{
struct frame *f = XFRAME (WINDOW_FRAME (XWINDOW (root_window)));
int i;
XWINDOW (root_window)->top_line = make_number (FRAME_TOP_MARGIN (f));
set_window_height (root_window,
FRAME_LINES (f) - 1 - FRAME_TOP_MARGIN (f),
0);
mini_w->top_line = make_number (FRAME_LINES (f) - 1);
set_window_height (minibuf_window, 1, 0);
XWINDOW (root_window)->total_cols = make_number (FRAME_COLS (f));
mini_w->total_cols = make_number (FRAME_COLS (f));
scratch_glyph_row.glyphs[TEXT_AREA] = scratch_glyphs;
scratch_glyph_row.glyphs[TEXT_AREA + 1]
= scratch_glyphs + MAX_SCRATCH_GLYPHS;
/* The default ellipsis glyphs `...'. */
for (i = 0; i < 3; ++i)
default_invis_vector[i] = make_number ('.');
}
{
/* Allocate the buffer for frame titles.
Also used for `format-mode-line'. */
int size = 100;
mode_line_noprop_buf = (char *) xmalloc (size);
mode_line_noprop_buf_end = mode_line_noprop_buf + size;
mode_line_noprop_ptr = mode_line_noprop_buf;
mode_line_target = MODE_LINE_DISPLAY;
}
help_echo_showing_p = 0;
}
/* Since w32 does not support atimers, it defines its own implementation of
the following three functions in w32fns.c. */
#ifndef WINDOWSNT
/* Platform-independent portion of hourglass implementation. */
/* Return non-zero if houglass timer has been started or hourglass is shown. */
int
hourglass_started ()
{
return hourglass_shown_p || hourglass_atimer != NULL;
}
/* Cancel a currently active hourglass timer, and start a new one. */
void
start_hourglass ()
{
#if defined (HAVE_WINDOW_SYSTEM)
EMACS_TIME delay;
int secs, usecs = 0;
cancel_hourglass ();
if (INTEGERP (Vhourglass_delay)
&& XINT (Vhourglass_delay) > 0)
secs = XFASTINT (Vhourglass_delay);
else if (FLOATP (Vhourglass_delay)
&& XFLOAT_DATA (Vhourglass_delay) > 0)
{
Lisp_Object tem;
tem = Ftruncate (Vhourglass_delay, Qnil);
secs = XFASTINT (tem);
usecs = (XFLOAT_DATA (Vhourglass_delay) - secs) * 1000000;
}
else
secs = DEFAULT_HOURGLASS_DELAY;
EMACS_SET_SECS_USECS (delay, secs, usecs);
hourglass_atimer = start_atimer (ATIMER_RELATIVE, delay,
show_hourglass, NULL);
#endif
}
/* Cancel the hourglass cursor timer if active, hide a busy cursor if
shown. */
void
cancel_hourglass ()
{
#if defined (HAVE_WINDOW_SYSTEM)
if (hourglass_atimer)
{
cancel_atimer (hourglass_atimer);
hourglass_atimer = NULL;
}
if (hourglass_shown_p)
hide_hourglass ();
#endif
}
#endif /* ! WINDOWSNT */
/* arch-tag: eacc864d-bb6a-4b74-894a-1a4399a1358b
(do not change this comment) */