[hackers] [st] Fixed 'missing glyph doesn't use fontconfig config substitutions' bug || Spencer Phippen

From: <git_AT_suckless.org>
Date: Thu, 24 Nov 2016 20:22:08 +0100 (CET)

commit fa9a4599720703932d1c4f16b9aeee1f91f96263
Author: Spencer Phippen <spencer.phippen_AT_gmail.com>
AuthorDate: Wed Nov 23 19:17:59 2016 +0100
Commit: Roberto E. Vargas Caballero <k0ga_AT_shike2.com>
CommitDate: Thu Nov 24 20:20:45 2016 +0100

    Fixed 'missing glyph doesn't use fontconfig config substitutions' bug
    
    XftFontMatch does display-specific font configuration (commit 528241a).
    Nice. Unfortunately, when we switched from FcFontMatch, we also stopped
    storing the post-Fc{Config,Default}Substitute FcPattern for future
    lookups. The result is that if a glyph isn't found in the primary font,
    secondary font lookups use the original FcPattern, not the configured
    one. If you have custom fontconfig rules (like me), this can be
    disappointing.
    
    I basically just copied the guts out of XftFontMatch[1] and saved
    the intermediate configured FcPattern. Could be related to the bug that
    inspired commit 4242027.
    
    [1]: https://cgit.freedesktop.org/xorg/lib/libXft/tree/src/xftfont.c

diff --git a/st.c b/st.c
index e50e884..031272f 100644
--- a/st.c
+++ b/st.c
_AT_@ -3373,16 +3373,32 @@ xgeommasktogravity(int mask)
 int
 xloadfont(Font *f, FcPattern *pattern)
 {
+ FcPattern *configured;
         FcPattern *match;
         FcResult result;
         XGlyphInfo extents;
         int wantattr, haveattr;
 
- match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
- if (!match)
+ /*
+ * Manually configure instead of calling XftMatchFont
+ * so that we can use the configured pattern for
+ * "missing glyph" lookups.
+ */
+ configured = FcPatternDuplicate(pattern);
+ if (!configured)
+ return 1;
+
+ FcConfigSubstitute(NULL, configured, FcMatchPattern);
+ XftDefaultSubstitute(xw.dpy, xw.scr, configured);
+
+ match = FcFontMatch(NULL, configured, &result);
+ if (!match) {
+ FcPatternDestroy(configured);
                 return 1;
+ }
 
         if (!(f->match = XftFontOpenPattern(xw.dpy, match))) {
+ FcPatternDestroy(configured);
                 FcPatternDestroy(match);
                 return 1;
         }
_AT_@ -3414,7 +3430,7 @@ xloadfont(Font *f, FcPattern *pattern)
                 strlen(ascii_printable), &extents);
 
         f->set = NULL;
- f->pattern = FcPatternDuplicate(pattern);
+ f->pattern = configured;
 
         f->ascent = f->match->ascent;
         f->descent = f->match->descent;
Received on Thu Nov 24 2016 - 20:22:08 CET

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