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From: Robert Pluim <rpluim@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 63731@debbugs.gnu.org, steven@stebalien.com
Subject: bug#63731: [PATCH] Support Emoji Variation Sequence 16 (FE0F) where appropriate
Date: Fri, 02 Jun 2023 15:58:37 +0200	[thread overview]
Message-ID: <878rd29d9u.fsf@gmail.com> (raw)
In-Reply-To: <834jnqaun6.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 02 Jun 2023 15:58:05 +0300")

>>>>> On Fri, 02 Jun 2023 15:58:05 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> CHAR+VS-15 and CHAR+VS-16 correctly choose text and emoji
    >> representation, but CHAR+VS-15 results in the text representation only
    >> if CHAR is not an emoji. If it is an emoji, the font selected for it
    >> will always be the emoji font.

    Eli> And an Emoji font, when presented with CHAR+VS-15 sequence doesn't
    Eli> produce a textual-representation glyph for CHAR?  I'd expect it to.

No.

    Eli> If Emoji fonts don't produce textual-representation glyphs in this
    Eli> case, I wonder how can this work at all.  Because if we select some
    Eli> non-Emoji font, it will probably not know about VS-15, so we will be
    Eli> left with VS-15.  Are we supposed to handle that ourselves, instead of
    Eli> relying on the font and the shaping engine?

    >> Iʼve tried forcing font_range to use the font for the 'symbol' script
    >> for EMOJI+VS-15, instead, but that resulted in composition
    >> failing.

Itʼs finding what appears to be the default system font, not whatʼs
specified in the fontset for 'symbol', so thatʼs one reason why
composition fails. Even with 'use-default-font-for-symbols' nil.

    Eli> That's what I'd expect: non-Emoji fonts don't know about VS-15.

Right

    Eli> What does HarfBuzz's hb-view do with such sequences, when using Noto
    Eli> Color Emoji font?

Sequence       Font             Result
23e9 fe0e      system           black box
23e9 fe0e      Symbola          correct text representation
23e9 fe0e      NotoEmoji        correct text representation
23e9 fe0e      NotoColorEmoji   blank

And on emacs-29, Symbola and NotoEmoji compose that sequence
correctly. Now I just need to persuade emacs-30 to use one of them.

Robert
-- 





  reply	other threads:[~2023-06-02 13:58 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-26  3:18 bug#63731: [PATCH] Support Emoji Variation Sequence 16 (FE0F) where appropriate Steven Allen
2023-05-26  6:41 ` Eli Zaretskii
2023-05-26  8:34   ` Robert Pluim
2023-05-26  8:46     ` Eli Zaretskii
2023-05-26 11:14       ` Robert Pluim
2023-05-26 12:06         ` Eli Zaretskii
2023-05-26 14:02           ` Robert Pluim
2023-05-26 14:55             ` Eli Zaretskii
2023-05-26 15:25               ` Robert Pluim
2023-05-26 15:52                 ` Eli Zaretskii
2023-05-26 16:24                   ` Robert Pluim
2023-05-26 17:27                     ` Eli Zaretskii
2023-05-26 17:35                       ` Robert Pluim
2023-05-26 18:05                         ` Eli Zaretskii
2023-05-28 11:43                           ` Robert Pluim
2023-05-28 12:44                             ` Eli Zaretskii
2023-05-26 17:43                       ` Eli Zaretskii
2023-05-28 10:29                         ` Robert Pluim
2023-05-28 12:37                           ` Eli Zaretskii
2023-05-28 11:57                       ` Robert Pluim
2023-05-28 12:47                         ` Eli Zaretskii
2023-05-29 10:44                           ` Robert Pluim
2023-05-29 13:58                             ` Eli Zaretskii
2023-05-29 14:43                               ` Robert Pluim
2023-05-29 14:55                                 ` Eli Zaretskii
2023-05-29 16:13                                   ` Robert Pluim
2023-05-29 17:18                                     ` Eli Zaretskii
2023-05-30  7:25                                       ` Robert Pluim
2023-05-30 12:10                                         ` Eli Zaretskii
2023-05-30 13:30                                           ` Robert Pluim
2023-05-30 16:32                                             ` Eli Zaretskii
2023-05-31 16:11                                               ` Robert Pluim
2023-05-31 16:18                                                 ` Eli Zaretskii
2023-06-01 12:43                                                   ` Eli Zaretskii
2023-06-01 13:30                                                     ` Robert Pluim
2023-06-01 16:10                                                       ` Eli Zaretskii
2023-06-01 16:34                                                         ` Robert Pluim
2023-06-02  8:15                                                           ` Robert Pluim
2023-06-02 12:06                                                             ` Eli Zaretskii
2023-06-02 12:25                                                               ` Robert Pluim
2023-06-02 12:58                                                                 ` Eli Zaretskii
2023-06-02 13:58                                                                   ` Robert Pluim [this message]
2023-06-03  5:36                                                                     ` Eli Zaretskii
2023-06-05 13:08                                                                       ` Robert Pluim
2023-06-05 13:12                                                                         ` Eli Zaretskii
2023-06-05 13:31                                                                           ` Eli Zaretskii
2023-06-05 14:06                                                                             ` Robert Pluim
2023-06-05 13:36                                                                           ` Robert Pluim
2023-06-05 13:47                                                                             ` Eli Zaretskii
2023-06-05 14:27                                                                               ` Robert Pluim
2023-06-05 15:35                                                                                 ` Eli Zaretskii
2023-06-05 15:57                                                                                   ` Robert Pluim
2023-06-05 16:20                                                                                     ` Robert Pluim
2023-06-05 16:41                                                                                       ` Eli Zaretskii
2023-06-06  7:24                                                                                         ` Robert Pluim
2023-06-05 16:39                                                                                     ` Eli Zaretskii
2023-06-06  7:28                                                                                       ` Robert Pluim
2023-06-06 11:53                                                                                         ` Eli Zaretskii
2023-05-26 15:06   ` Steven Allen
2023-05-26 15:29     ` Robert Pluim
2023-05-26 16:03       ` Steven Allen

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