FAQ: add entry about color emoji Xft bug (bbb3e5)
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FAQ
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FAQ
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@ -165,3 +165,30 @@ Apply [1].
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[1] http://st.suckless.org/patches/delkey
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## BadLength X error in Xft when trying to render emoji
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Xft makes st crash when rendering color emojis with the following error:
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"X Error of failed request: BadLength (poly request too large or internal Xlib length error)"
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Major opcode of failed request: 139 (RENDER)
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Minor opcode of failed request: 20 (RenderAddGlyphs)
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Serial number of failed request: 1595
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Current serial number in output stream: 1818"
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This is a known bug in Xft (not st) which happens on some platforms and
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combination of particular fonts and fontconfig settings.
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See also:
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https://gitlab.freedesktop.org/xorg/lib/libxft/issues/6
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https://bugs.freedesktop.org/show_bug.cgi?id=107534
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https://bugzilla.redhat.com/show_bug.cgi?id=1498269
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The solution is to remove color emoji fonts or disable this in the fontconfig
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XML configuration. As an ugly workaround (which may work only on newer
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fontconfig versions (FC_COLOR)), the following code can be used to mask color
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fonts:
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FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
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Please don't bother reporting this bug to st, but notify the upstream Xft
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developers about fixing this bug.
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