Make Cairo build obey hint-style font setting (Bug#35781)

* src/ftfont.h (ftfont_open2): Remove extern.
(ftfont_fix_match, ftfont_add_rendering_parameters)
(ftfont_entity_pattern): Add externs.
(struct font_info): Remove member bitmap_strike_index.
(struct font_info) [USE_CAIRO]: Remove member ft_size_draw.  All uses removed.
Add member bitmap_position_unit.

* src/xftfont.c (xftfont_fix_match, xftfont_add_rendering_parameters): Move
functions from here ...
* src/ftfont.c (ftfont_fix_match, ftfont_add_rendering_parameters): ... to
here.  All uses changed.
* src/xftfont.c (xftfont_open): Extract FcPattern creation from font entity
from here ...
* src/ftfont.c (ftfont_entity_pattern):	... to here.
* src/xftfont.c (syms_of_xftfont): Move DEFSYMs for Fontconfig's rendering
parameters from here ...
* src/ftfont.c (syms_of_ftfont): ... to here.

* src/ftfont.c (ftfont_open, ftfont_open2): Undo introduction of
bitmap_strike_index.  Merge functions into ftfont_open.

* src/ftcrfont.c (ftcrfont_open): Align code with xftfont_open rather than
ftfont_open.
(ftcrfont_close): Likewise.
(ftcrfont_has_char, ftcrfont_encode_char):
(ftcrfont_otf_capability) [HAVE_LIBOTF]:
(ftcrfont_variation_glyphs) [HAVE_OTF_GET_VARIATION_GLYPHS]: New functions.
(ftcrfont_driver): Register them.
(ftcrfont_get_bitmap, ftcrfont_anchor_point):
(ftcrfont_shape) [HAVE_M17N_FLT && HAVE_LIBOTF]: Use bitmap_position_unit
instead of bitmap_strike_index to screen bitmap fonts.
(ftcrfont_get_bitmap, ftcrfont_anchor_point):
(ftcrfont_otf_capability) [HAVE_LIBOTF]:
(ftcrfont_shape) [HAVE_M17N_FLT && HAVE_LIBOTF]:
(ftcrfont_variation_glyphs) [HAVE_OTF_GET_VARIATION_GLYPHS]: Temporarily
assign ftcrfont_info->ft_size and call corresponding ftfont functions.
(ftcrfont_draw): Don't flush cairo surface when exporting.

1 files changed, 7 insertions, 11 deletions

diff --git a/src/ftfont.h b/src/ftfont.h
index adbda49ff1c..7860469491f 100644
--- a/src/ftfont.h
+++ b/src/ftfont.h
@@ -37,10 +37,9 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #endif	/* HAVE_LIBOTF */
 
 extern FcCharSet *ftfont_get_fc_charset (Lisp_Object);
-extern Lisp_Object ftfont_open2 (struct frame *f,
-                                 Lisp_Object entity,
-                                 int pixel_size,
-                                 Lisp_Object font_object);
+extern void ftfont_fix_match (FcPattern *, FcPattern *);
+extern void ftfont_add_rendering_parameters (FcPattern *, Lisp_Object);
+extern FcPattern *ftfont_entity_pattern (Lisp_Object, int);
 
 /* This struct is shared by the XFT, Freetype, and Cairo font
    backends.  Members up to and including 'matrix' are common, the
@@ -54,17 +53,14 @@ struct font_info
 #endif	/* HAVE_LIBOTF */
   FT_Size ft_size;
   int index;
-  /* Index of the bitmap strike used as a fallback for
-     FT_Set_Pixel_Sizes failure.  If the value is non-negative, then
-     ft_size is not of the requested size.  Otherwise it is -1.  */
-  FT_Int bitmap_strike_index;
   FT_Matrix matrix;
 
 #ifdef USE_CAIRO
   cairo_scaled_font_t *cr_scaled_font;
-  /* To prevent cairo from cluttering the activated FT_Size maintained
-     in ftfont.c, we activate this special FT_Size before drawing.  */
-  FT_Size ft_size_draw;
+  /* Scale factor from the bitmap strike metrics in 1/64 pixels, used
+     as the hb_position_t value in HarfBuzz, to those in (scaled)
+     pixels.  The value is 0 for scalable fonts.  */
+  double bitmap_position_unit;
   /* Font metrics cache.  */
   struct font_metrics **metrics;
   short metrics_nrows;