GNU bug report logs - #39799
28.0.50; Most emoji sequences don’t render correctly

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Package: emacs;

Reported by: Mike FABIAN <mfabian <at> redhat.com>

Date: Wed, 26 Feb 2020 14:30:03 UTC

Severity: normal

Found in version 28.0.50

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: rgm <at> gnu.org, 39799 <at> debbugs.gnu.org, Mike FABIAN <mfabian <at> redhat.com>
Subject: bug#39799: 28.0.50; Most emoji sequences don’t render correctly
Date: Tue, 21 Sep 2021 14:50:22 +0200

>>>>> On Tue, 21 Sep 2021 14:58:35 +0300, Eli Zaretskii <eliz <at> gnu.org> said:

    >> From: Mike FABIAN <mfabian <at> redhat.com>
    >> Cc: Eli Zaretskii <eliz <at> gnu.org>,  rgm <at> gnu.org,  39799 <at> debbugs.gnu.org
    >> Date: Tue, 21 Sep 2021 13:48:17 +0200
    >> 
    >> > Iʼve just pushed a change to master that should fix (almost) all the
    >> > issues with displaying emoji sequences (except for keycaps). Feedback
    >> > welcome.
    >> 
    >> Should that also fix the skin tones?

    Eli> It should, and I thought HarfBuzz on Cairo already supported that?

It does, but with 'Noto Color Emoji' it doesnʼt work for all
codepoints.

    Eli> Can you try this with hb-view and see if HarfBuzz produces a single
    Eli> glyph/grapheme from this sequence?

For reference, since the documentation of hb-view is sadly lacking:

hb-view  --output-file=foo.svg --font-size=14 \
/usr/share/fonts/truetype/noto/NotoColorEmoji.ttf  -u 1f469

produces a glyph with no skin tone. And

hb-view  --output-file=foo.svg --font-size=14 \
/usr/share/fonts/truetype/noto/NotoColorEmoji.ttf  -u 1f469,1f3fd

Produces one with a medium tone. The skin tones are working for other
code points, so I donʼt know what's causing this particular problem.

Robert
--
This bug report was last modified 3 years and 256 days ago.

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