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/* Interface definitions for display code.
Copyright (C) 1985, 1990 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 1, 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; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Nonzero means do not assume anything about current
contents of actual terminal screen */
extern int screen_garbaged;
/* Desired terminal cursor position (to show position of point),
origin zero. */
extern int cursor_hpos, cursor_vpos;
/* Nonzero means last display completed
and cursor is really at cursor_hpos, cursor_vpos.
Zero means it was preempted. */
extern int display_completed;
/* Nonzero while trying to read keyboard input at main program level. */
extern int waiting_for_input;
struct matrix
{
/* Height of this matrix. */
int height;
/* Width of this matrix. */
int width;
/* Vector of used widths of lines, indexed by vertical position. */
int *used;
/* Vector of line contents.
m->contents[V][H] is the character at position V, H.
Note that ->contents[...][screen_width] is always 0
and so is ->contents[...][-1]. */
unsigned char **contents;
/* Long vector from which the line contents are taken. */
unsigned char *total_contents;
/* Vector indicating, for each line, whether it is highlighted. */
char *highlight;
/* Vector indicating, for each line, whether its contents mean anything. */
char *enable;
};
/* Current screen contents. */
extern struct matrix *current_screen;
/* Screen contents to be displayed. */
extern struct matrix *new_screen;
/* Temporary buffer for screen contents. */
extern struct matrix *temp_screen;
/* Get ready to display on screen line VPOS at column HPOS
and return the string where the text of that line is stored. */
unsigned char *get_display_line ();
/* Buffer used by `message' for formatting a message, and by print.c. */
extern char *message_buf;
/* Nonzero means message_buf is being used by print. */
extern int message_buf_print;
/* Message to display instead of minibuffer contents
This is what the functions error and message make,
and command echoing uses it as well.
It overrides the minibuf_prompt as well as the buffer. */
extern char *echo_area_contents;
/* All costs measured in characters.
So no cost can exceed the area of a screen, measured in characters.
This should not be more than million.
Meanwhile, we can add lots of millions together without overflow. */
#define INFINITY 1000000
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