Replace XChar2b with unsigned in all font backends

The xfont backend using XChar2b in its API doesn't mean that we should
use it everywhere else.

* src/dispextern.h (glyph_string):
* src/ftcrfont.c (ftcrfont_draw):
* src/ftxfont.c (ftxfont_draw):
* src/w32term.c (w32_draw_glyphless_glyph_string_foreground):
* src/xdisp.c (init_glyph_string, get_char_face_and_encoding)
(get_glyph_face_and_encoding, get_char_glyph_code)
(fill_gstring_glyph_string, fill_stretch_glyph_string)
(normal_char_ascent_descent, gui_get_glyph_overhangs)
(compute_overhangs_and_x, gui_produce_glyphs):
* src/xfont.c (xfont_get_pcm, xfont_chars_supported, xfont_open)
(xfont_encode_char, xfont_text_extents, xfont_draw)
* src/xftfont.c (xftfont_draw):
* src/xterm.c (x_compute_glyph_string_overhangs)
(x_draw_glyphless_glyph_string_foreground): Use unsigned over XChar2b.

* src/nsgui.h:
* src/w32gui.h:
* src/xterm.h: Remove XChar2b, STORE_XCHAR2B, XCHAR2B_BYTE1, and
XCHAR2B_BYTE2 typedefs and macros.

* src/font.h (font_driver):
(ftfont_text_extents)
* src/ftcrfont.c (ftcrfont_text_extents):
* src/ftfont.c (ftfont_text_extents):
* src/macfont.m (macfont_text_extents):
* src/nsfont.m (nsfont_text_extents):
* src/w32font.h (w32_font_text_extents):
* src/font.c (xfont_text_extents):
* src/xftfont.c (xftfont_text_extents): Make code parameter const.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/font.h b/src/font.h
index 3720650a2e1..9ca0c97dc52 100644
--- a/src/font.h
+++ b/src/font.h
@@ -647,7 +647,7 @@ struct font_driver
      the font FONT and the sequence of glyph codes CODE, and store the
      result in METRICS.  */
   void (*text_extents) (struct font *font,
-                        unsigned *code, int nglyphs,
+                        const unsigned *code, int nglyphs,
                         struct font_metrics *metrics);
 
 #ifdef HAVE_WINDOW_SYSTEM
@@ -894,7 +894,7 @@ extern Lisp_Object ftfont_shape (Lisp_Object);
 extern unsigned ftfont_encode_char (struct font *, int);
 extern void ftfont_close (struct font *);
 extern void ftfont_filter_properties (Lisp_Object, Lisp_Object);
-extern void ftfont_text_extents (struct font *, unsigned *, int,
+extern void ftfont_text_extents (struct font *, const unsigned *, int,
                                  struct font_metrics *);
 extern void syms_of_ftfont (void);
 #endif  /* HAVE_FREETYPE */