libsl

commit 53ebcb48c6b12882c6dbe352ee43c96b2fb01b84
parent e1132a979e39d6cdb8c34ea5496c901a5b8c2d79
Author: Thomas Spurden <thomas@spurden.name>
Date:   Wed, 16 Jan 2019 21:51:30 +0000

Workaround Xft BadLength X error

Modify the fontconfig pattern to prefer non-color fonts, and discard any
selected font which has the color flag set. Using these fonts with Xft is just
going to generate a BadLength X error.

Diffstat:
M
drw.c
 | 
14
++++++++++++++

1 file changed, 14 insertions(+), 0 deletions(-)
diff --git a/drw.c b/drw.c
@@ -132,6 +132,19 @@ xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
 		die("no font specified.");
 	}
 
+	/* Do not allow using color fonts. This is a workaround for a BadLength
+	 * error from Xft with color glyphs. Modelled on the Xterm workaround. See
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
+	 * https://lists.suckless.org/dev/1701/30932.html
+	 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
+	 * and lots more all over the internet.
+	 */
+	FcBool iscol;
+	if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
+		XftFontClose(drw->dpy, xfont);
+		return NULL;
+	}
+
 	font = ecalloc(1, sizeof(Fnt));
 	font->xfont = xfont;
 	font->pattern = pattern;
@@ -337,6 +350,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 			fcpattern = FcPatternDuplicate(drw->fonts->pattern);
 			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
+			FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
 
 			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 			FcDefaultSubstitute(fcpattern);