[hackers] [st] FAQ: add entry about color emoji Xft bug || Hiltjo Posthuma

From: <git_AT_suckless.org>
Date: Fri, 17 May 2019 13:02:04 +0200 (CEST)

commit caa1d8fbea2b92bca24652af0fee874bdbbbb3e5
Author: Hiltjo Posthuma <hiltjo_AT_codemadness.org>
AuthorDate: Fri May 17 13:00:10 2019 +0200
Commit: Hiltjo Posthuma <hiltjo_AT_codemadness.org>
CommitDate: Fri May 17 13:00:10 2019 +0200

    FAQ: add entry about color emoji Xft bug
    This has been asked many times on IRC and the mailinglist. Make it easier to
    find information about this particular Xft issue by adding it to the FAQ.

diff --git a/FAQ b/FAQ
index 921c493..ecf7af8 100644
--- a/FAQ
+++ b/FAQ
_AT_@ -165,3 +165,30 @@ Apply [1].
 [1] http://st.suckless.org/patches/delkey
+## BadLength X error in Xft when trying to render emoji
+Xft makes st crash when rendering color emojis with the following error:
+"X Error of failed request: BadLength (poly request too large or internal Xlib length error)"
+ Major opcode of failed request: 139 (RENDER)
+ Minor opcode of failed request: 20 (RenderAddGlyphs)
+ Serial number of failed request: 1595
+ Current serial number in output stream: 1818"
+This is a known bug in Xft (not st) which happens on some platforms and
+combination of particular fonts and fontconfig settings.
+See also:
+The solution is to remove color emoji fonts or disable this in the fontconfig
+XML configuration. As an ugly workaround (which may work only on newer
+fontconfig versions (FC_COLOR)), the following code can be used to mask color
+ FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
+Please don't bother reporting this bug to st, but notify the upstream Xft
+developers about fixing this bug.
Received on Fri May 17 2019 - 13:02:04 CEST

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