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bug#39799: 28.0.50; Most emoji sequences don’t render correctly
From: |
Robert Pluim |
Subject: |
bug#39799: 28.0.50; Most emoji sequences don’t render correctly |
Date: |
Fri, 28 Feb 2020 15:14:01 +0100 |
>>>>> On Fri, 28 Feb 2020 15:08:59 +0200, Eli Zaretskii <eliz@gnu.org> said:
>> From: Robert Pluim <rpluim@gmail.com>
>> Cc: Mike FABIAN <mfabian@redhat.com>, 39799@debbugs.gnu.org
>> Date: Fri, 28 Feb 2020 13:21:59 +0100
>>
Eli> I'd prefer not to add Python as prerequisite for building Emacs. We
Eli> already use Awk, so using that'd be fine.
>>
>> I suck at awk, but my attempt is attached.
Eli> Thanks. I wonder if we could make the output more human-readable...
Eli> Glenn, any advice or comments?
Why does it need to be human-readable? The other files generated from
the unicode data are not particularly readable.
>> It DTRT for me under Cairo if I change my fontset settings to use
>> 'Noto Color Emoji' instead of Symbola for:
Eli> Is that a free font (it's from Google, AFAIK, so it might not be)? If
Eli> it is free, we could modify fontset.el to use this font if available.
Eli> (Or maybe there are better free Emoji fonts out there?)
Its license is Apache 2.0. It seems fairly popular. I have no opinion
either way.
>> (#x1F300 . #x1F5FF) ;; Misc Symbols and Pictographs
>> (#x1F900 . #x1F9FF) ;; Supplemental Symbols and Pictographs
>>
>> It matches forward off the first char, so the
>> composition-function-table entries all have '0' as the number of chars
>> to match. Would it be better to match backwards?
Eli> I don't think matching backwards is better in general. Did you have a
Eli> reason for thinking it was?
I thought I saw a comment in composite.c that says matching is done
backward, but I see that itʼs done forwards as well.
>> Weʼd run into the 4-character maximum for that, since some of the
>> sequences are 7 or more characters long.
Eli> If the sequences are 7 character long, then the forward-matching
Eli> pattern will hit the same limitation as well, no?
C-h v composition-function-table says:
PREV-CHARS is a non-negative integer (less than 4) specifying how many
characters before C to check the matching with PATTERN. If it is 0,
PATTERN must match C and the following characters. If it is 1,
PATTERN must match a character before C and the following characters.
which on careful re-reading says that the lookback canʼt be more than
3 characters, but that matching forward has no limit.
Eli> The ones in
http://www.unicode.org/Public/emoji/12.0/emoji-sequences.txt,
Eli> and specifically the flag sequences and the skin color sequences. At
Eli> least AFAIU the original report.
As Mike clarified, you need to change the fontsets in order to get
them to display in colour (uncomposed, of course).
Robert
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, (continued)
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Robert Pluim, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Robert Pluim, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly,
Robert Pluim <=
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Robert Pluim, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Robert Pluim, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Robert Pluim, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Eli Zaretskii, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Robert Pluim, 2020/02/28
- bug#39799: 28.0.50; Most emoji sequences don’t render correctly, Mike FABIAN, 2020/02/28