From: Robert Pluim <rpluim@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org, kevin.legouguec@gmail.com
Subject: Re: Better emoji support
Date: Mon, 20 Sep 2021 21:30:13 +0200 [thread overview]
Message-ID: <87pmt3hwoq.fsf@gmail.com> (raw)
In-Reply-To: <838rzr13i6.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 20 Sep 2021 21:54:57 +0300")
>>>>> On Mon, 20 Sep 2021 21:54:57 +0300, Eli Zaretskii <eliz@gnu.org> said:
>> From: Robert Pluim <rpluim@gmail.com>
>> Cc: kevin.legouguec@gmail.com, emacs-devel@gnu.org
>> Date: Mon, 20 Sep 2021 19:32:23 +0200
>>
Eli> My idea is to trick the font_range function, which verifies that the
Eli> sequence can be composed using a single font, to use an Emoji font
Eli> when it sees something followed by a variation selector, instead of
Eli> the font for the first character in the sequence. For that, the rules
Eli> for Emoji sequences in composition-function-table should be anchored
Eli> on the VS-n codepoints (which I think is a good idea regardless).
>>
>> Weʼd have to raise the lookback limit for composition-function-table
>> rules higher than 3 (maybe only to 4).
Eli> Examples? Not that it's a catastrophe.
From emoji-zwj-sequences.txt:
1F468 1F3FB 200D 2764 FE0F 200D 1F468 1F3FB ; RGI_Emoji_ZWJ_Sequence
; couple with heart: man, man, light skin tone #
E13.1 [1] (👨🏻❤️👨🏻)
With the current limit you'd get no further than the 1F3FB if you
anchored at FE0F, and miss the 1F468.
>> I guess it reduces the number of entries in
>> composition-function-table, but then you end up with a lot of rules
>> for eg VS-16.
Eli> Why do you think we need to have a lot of such rules? What kind of
Eli> rules did you think about?
For whatever reason, a lot of the sequences in emoji-zwj-sequences.txt
contain codepoints with Emoji_Presentation = No, hence theyʼre
followed by VS-16. As a result, anchoring to VS-16 would produces a
lot of rules for VS-16.
>> emoji-zwj-sequences.txt would result in about 840 rules,
>> with a lot of redundancy, which could be reduced, but I think that can
>> wait until after the zwj sequence stuff goes in.
Eli> I guess I'm missing something because I don't see a problem there.
Perhaps Iʼm worrying too much. It would be a lot of rules to check,
but only when encountering VS-16.
Anyway, we can measure the difference, if any, once we have the base
implementation and Someone™ implements the VS-16 anchored version (it
would only be a dozen lines of awk, I think).
Robert
--
next prev parent reply other threads:[~2021-09-20 19:30 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-10 9:19 Better emoji support Eli Zaretskii
2021-07-10 9:24 ` Robert Pluim
2021-07-10 9:37 ` Eli Zaretskii
2021-07-10 9:45 ` Robert Pluim
2021-07-10 9:48 ` Eli Zaretskii
2021-07-12 8:27 ` Robert Pluim
2021-07-12 14:02 ` Robert Pluim
2021-07-12 15:38 ` Robert Pluim
2021-07-12 15:59 ` Eli Zaretskii
2021-07-13 7:00 ` Jean Louis
2021-07-13 7:50 ` Robert Pluim
2021-07-15 15:15 ` Robert Pluim
2021-07-15 15:44 ` Eli Zaretskii
2021-09-13 12:36 ` Eli Zaretskii
2021-09-13 15:44 ` Robert Pluim
2021-09-13 16:07 ` Eli Zaretskii
2021-09-13 16:36 ` Jean-Christophe Helary
2021-09-17 13:01 ` Robert Pluim
2021-09-17 13:42 ` Jean-Christophe Helary
2021-09-17 13:50 ` Robert Pluim
2021-09-17 15:51 ` Kévin Le Gouguec
2021-09-17 16:43 ` Robert Pluim
2021-09-17 19:34 ` Kévin Le Gouguec
2021-09-19 18:27 ` Robert Pluim
2021-09-19 19:43 ` Kévin Le Gouguec
2021-09-20 4:23 ` Eli Zaretskii
2021-09-20 6:20 ` Kévin Le Gouguec
2021-09-20 6:53 ` Eli Zaretskii
2021-09-20 8:40 ` Robert Pluim
2021-09-20 9:53 ` Eli Zaretskii
2021-09-20 13:03 ` Robert Pluim
2021-09-20 13:15 ` Eli Zaretskii
2021-09-20 13:25 ` Eli Zaretskii
2021-09-20 13:50 ` Robert Pluim
2021-09-20 15:27 ` Eli Zaretskii
2021-09-20 17:32 ` Robert Pluim
2021-09-20 18:54 ` Eli Zaretskii
2021-09-20 19:30 ` Robert Pluim [this message]
2021-09-20 19:42 ` Eli Zaretskii
2021-09-20 20:05 ` Robert Pluim
2021-09-20 13:40 ` Robert Pluim
2021-09-20 13:45 ` Eli Zaretskii
2021-09-17 15:58 ` Jean-Christophe Helary
2021-09-17 16:35 ` Daniel Martín
2021-09-17 16:52 ` Robert Pluim
2021-09-17 15:39 ` Stephen Berman
2021-09-17 16:01 ` Eli Zaretskii
2021-09-17 16:34 ` Stephen Berman
2021-09-17 16:58 ` Robert Pluim
2021-09-17 17:05 ` Stephen Berman
2021-09-17 17:10 ` Robert Pluim
2021-09-17 17:17 ` Stephen Berman
2021-09-17 17:37 ` Better emoji support, " Robert Pluim
2021-09-17 17:49 ` Stephen Berman
2021-09-17 17:51 ` Robert Pluim
2021-09-17 18:53 ` martin rudalics
2021-09-17 18:58 ` Robert Pluim
2021-09-17 19:44 ` Stephen Berman
2021-09-17 18:53 ` martin rudalics
2021-09-17 16:55 ` martin rudalics
2021-09-17 18:48 ` Eli Zaretskii
2021-09-17 18:59 ` Robert Pluim
2021-09-18 5:39 ` Eli Zaretskii
2021-09-18 6:25 ` Eli Zaretskii
2021-09-19 16:09 ` Juri Linkov
2021-09-19 17:16 ` Kévin Le Gouguec
2021-09-19 18:20 ` Robert Pluim
2021-09-19 19:13 ` Robert Pluim
2021-09-19 17:24 ` Eli Zaretskii
2021-09-19 18:10 ` Robert Pluim
2021-09-19 18:29 ` Eli Zaretskii
2021-09-19 18:40 ` Robert Pluim
2021-09-19 18:34 ` Eli Zaretskii
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