Support X core font driver on cairo (Bug#28236)

* configure.ac (HAVE_X_WINDOWS): Add xfont.o to FONT_OBJ if HAVE_CAIRO.

* doc/lispref/frames.texi (Font and Color Parameters): Mention X core font
driver with Cairo drawing.

* src/font.c (syms_of_font) [HAVE_X_WINDOWS && USE_CAIRO]: Call syms_of_xfont.

* src/xfns.c (x_create_tip_frame) [USE_CAIRO]: Register xfont_driver.

* src/xterm.c (x_cr_gc_clip) [USE_CAIRO]: New function extracted from
x_begin_cr_clip.
(x_begin_cr_clip) [USE_CAIRO]: Use it.
(xlib_surface_key, saved_drawable_key) [USE_CAIRO]: New variables.
(x_cr_destroy_xlib_surface, x_try_cr_xlib_drawable)
(x_end_cr_xlib_drawable) [USE_CAIRO]: New functions.
(x_draw_composite_glyph_string_foreground)
(x_draw_glyph_string_foreground) [USE_CAIRO]: Get Xlib surface when drawing
text with X core fonts into bitmap surfaces.  Add fallback code for drawing
into outline surfaces.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/font.c b/src/font.c
index 6ab4923c3d2..5705758b99f 100644
--- a/src/font.c
+++ b/src/font.c
@@ -5497,10 +5497,10 @@ cause Xft crashes.  Only has an effect in Xft builds.  */);
 #ifdef HAVE_FREETYPE
   syms_of_ftfont ();
 #ifdef HAVE_X_WINDOWS
+  syms_of_xfont ();
 #ifdef USE_CAIRO
   syms_of_ftcrfont ();
 #else
-  syms_of_xfont ();
   syms_of_ftxfont ();
 #ifdef HAVE_XFT
   syms_of_xftfont ();