Ignore color fonts when using Xft

* src/font.c (syms_of_font): New configuration variable
xft-ignore-color-fonts, default t.
* src/ftfont.c (ftfont_spec_pattern): Tell fontconfig to ignore
color fonts if xft-ignore-color-fonts is t.  (Bug#30874, Bug#30045)
* etc/NEWS: Document xft-ignore-color-fonts.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/font.c b/src/font.c
index e53935a15cc..305bb14576a 100644
--- a/src/font.c
+++ b/src/font.c
@@ -5476,6 +5476,13 @@ Disabling compaction of font caches might enlarge the Emacs memory
 footprint in sessions that use lots of different fonts.  */);
   inhibit_compacting_font_caches = 0;
 
+  DEFVAR_BOOL ("xft-ignore-color-fonts",
+               Vxft_ignore_color_fonts,
+               doc: /*
+Non-nil means don't query fontconfig for color fonts, since they often
+cause Xft crashes.  Only has an effect in Xft builds.  */);
+  Vxft_ignore_color_fonts = 1;
+
 #ifdef HAVE_WINDOW_SYSTEM
 #ifdef HAVE_FREETYPE
   syms_of_ftfont ();