bug#39799: 28.0.50; Most emoji sequences don’t render correctly

[Mike FABIAN]

Eli Zaretskii <eliz@gnu.org> さんはかきました:

>> From: Robert Pluim <rpluim@gmail.com>
>> Cc: Mike FABIAN <mfabian@redhat.com>,  rgm@gnu.org,  39799@debbugs.gnu.org
>> Date: Tue, 21 Sep 2021 14:50:22 +0200
>> 
>>     >> 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.
>
> If it works with hb-view, but not in Emacs, it's our problem.  If it
> doesn't work in hb-view as well, perhaps we should ask the HarfBuzz
> developers what they have to say about this.

It does work with hb-view.

-- 
Mike FABIAN <mfabian@redhat.com>
睡眠不足はいい仕事の敵だ。