From: Eli Zaretskii <eliz@gnu.org>
To: Lars Ingebrigtsen <larsi@gnus.org>
Cc: mattiase@acm.org, raman@google.com, gregory@heytings.org,
schwab@linux-m68k.org, stefankangas@gmail.com,
emacs-devel@gnu.org
Subject: Re: Ligature support (was: Entering emojis)
Date: Fri, 05 Nov 2021 09:56:48 +0200 [thread overview]
Message-ID: <83cznfdohr.fsf@gnu.org> (raw)
In-Reply-To: <87wnlnkxbo.fsf@gnus.org> (message from Lars Ingebrigtsen on Fri, 05 Nov 2021 06:04:11 +0100)
[I've changed the Subject, because the original thread is unrelated,
and it's too long already.]
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: gregory@heytings.org, mattiase@acm.org, emacs-devel@gnu.org,
> schwab@linux-m68k.org, stefankangas@gmail.com, raman@google.com
> Date: Fri, 05 Nov 2021 06:04:11 +0100
>
> So apparently by traversing the GSUB/GPOS tables (whatever they are),
> this data can be found, and then we can feed it to font-shape-gstring
> and get ligatures?
You are describing what the text shaper does when it looks for
possible ligatures. Why should we reproduce this in Emacs? It's the
job of the shaping engine to understand how to query a font for some
information. Delegating that job to the shaping engine is TRT, so
that we don't need to make changes in Emacs when some new variant of
font appears in the wild.
And I'm not sure I understand the idea behind this. Are you trying to
add a feature to Emacs whereby it queries the font up from about the
ligatures it supports? What would we do with such an information?
And for which font(s) would we request it?
We have font-shape-gstring. If the font being used doesn't have a
ligature for the character sequence we pass to it, that function
returns nil, and we then display those characters "normally". Isn't
that enough?
> But apparently we already parse these tables in hbfont_otf_capability?
Only for script and language information, because some scripts require
fonts that support special features of those scripts, and so our
default fontset requires the presence of those features in the font;
those features are queried when we determine whether some font can be
used for a character from those scripts.
> So... we need... to parse them more to get all the ligature data out
> of them and then... put it in a ... char table range? How all this
> connects is very vague to me. 😀
As I say above, I'm not sure I understand the goal of this, given what
we have already.
next prev parent reply other threads:[~2021-11-05 7:56 UTC|newest]
Thread overview: 342+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 18:32 Entering emojis Lars Ingebrigtsen
2021-10-25 18:45 ` Eli Zaretskii
2021-10-25 19:21 ` Lars Ingebrigtsen
2021-10-25 19:26 ` Eli Zaretskii
2021-10-25 19:36 ` Lars Ingebrigtsen
2021-10-25 19:40 ` Eli Zaretskii
2021-10-25 19:49 ` Lars Ingebrigtsen
2021-10-25 20:14 ` Gregory Heytings
2021-10-25 20:49 ` Lars Ingebrigtsen
2021-10-26 2:01 ` Howard Melman
2021-10-26 2:29 ` Eli Zaretskii
2021-10-26 3:38 ` Lars Ingebrigtsen
2021-10-26 9:10 ` Stefan Kangas
2021-10-26 11:50 ` Lars Ingebrigtsen
2021-10-26 14:35 ` Lars Ingebrigtsen
2021-10-27 12:18 ` Lars Ingebrigtsen
2021-10-27 13:49 ` Lars Ingebrigtsen
2021-10-26 15:46 ` Stefan Kangas
2021-10-26 16:09 ` Lars Ingebrigtsen
2021-10-26 16:36 ` Lars Ingebrigtsen
2021-10-26 16:42 ` Lars Ingebrigtsen
2021-10-26 16:52 ` Eli Zaretskii
2021-10-26 17:36 ` Lars Ingebrigtsen
2021-10-26 16:49 ` Eli Zaretskii
2021-10-26 17:09 ` Robert Pluim
2021-10-26 17:14 ` Eli Zaretskii
2021-10-26 17:33 ` Lars Ingebrigtsen
2021-10-26 17:39 ` Eli Zaretskii
2021-10-27 12:44 ` Lars Ingebrigtsen
2021-10-26 17:43 ` Lars Ingebrigtsen
2021-10-26 17:54 ` Gregory Heytings
2021-10-26 18:14 ` Lars Ingebrigtsen
2021-10-26 17:55 ` Robert Pluim
2021-10-26 18:08 ` Lars Ingebrigtsen
2021-10-26 17:46 ` Robert Pluim
2021-10-26 17:58 ` Lars Ingebrigtsen
2021-10-26 18:07 ` Robert Pluim
2021-10-26 18:14 ` Lars Ingebrigtsen
2021-10-26 18:18 ` Robert Pluim
2021-10-26 18:24 ` Lars Ingebrigtsen
2021-10-26 19:18 ` describe-char on emoji sequences Lars Ingebrigtsen
2021-10-26 19:28 ` Eli Zaretskii
2021-10-26 19:42 ` Lars Ingebrigtsen
2021-10-27 13:35 ` James Cloos
2021-10-27 13:43 ` Lars Ingebrigtsen
2021-10-27 15:07 ` Andreas Schwab
2021-10-27 15:15 ` Lars Ingebrigtsen
2021-10-27 15:59 ` Robert Pluim
2021-10-27 16:11 ` Andreas Schwab
2021-10-27 16:05 ` Eli Zaretskii
2021-10-27 16:12 ` Andreas Schwab
2021-10-27 16:23 ` Lars Ingebrigtsen
2021-10-27 16:34 ` Andreas Schwab
2021-10-27 16:36 ` Eli Zaretskii
2021-10-27 16:43 ` Andreas Schwab
2021-10-27 17:02 ` Eli Zaretskii
2021-10-27 17:32 ` Robert Pluim
2021-10-27 19:40 ` Andreas Schwab
2021-10-27 19:48 ` Gregory Heytings
2021-10-27 16:26 ` Eli Zaretskii
2021-10-27 16:36 ` Andreas Schwab
2021-10-27 17:08 ` James Cloos
2021-10-27 17:13 ` Eli Zaretskii
2021-10-27 17:36 ` Robert Pluim
2021-10-27 18:23 ` Eli Zaretskii
2021-10-28 7:02 ` James Cloos
2021-10-28 7:46 ` Robert Pluim
2021-10-28 9:34 ` Eli Zaretskii
2021-10-28 9:39 ` Robert Pluim
2021-10-28 9:16 ` Eli Zaretskii
2021-10-28 19:24 ` James Cloos
2021-10-28 19:34 ` Eli Zaretskii
2021-10-28 12:21 ` Richard Stallman
2021-10-28 12:23 ` Lars Ingebrigtsen
2021-10-27 13:49 ` Eli Zaretskii
2021-10-27 13:57 ` Eli Zaretskii
2021-10-27 14:25 ` Lars Ingebrigtsen
2021-10-27 16:30 ` Eli Zaretskii
2021-10-27 17:30 ` T.V Raman
2021-10-28 14:35 ` Lars Ingebrigtsen
2021-10-28 23:17 ` Lars Ingebrigtsen
2021-10-26 16:45 ` Entering emojis Stefan Kangas
2021-10-26 17:34 ` Lars Ingebrigtsen
2021-10-26 18:39 ` William Xu
2021-10-26 19:35 ` Stefan Monnier
2021-10-26 20:41 ` Broken Stefan Kangas
2021-10-26 21:12 ` Entering emojis Stefan Kangas
2021-10-27 1:38 ` Howard Melman
2021-10-27 8:27 ` Mattias Engdegård
2021-10-27 8:51 ` Andreas Schwab
2021-10-27 14:14 ` T.V Raman
2021-10-27 15:14 ` Gregory Heytings
2021-10-27 17:20 ` Eli Zaretskii
2021-10-27 16:01 ` Eli Zaretskii
2021-10-27 17:50 ` Gregory Heytings
2021-10-27 18:27 ` Eli Zaretskii
2021-10-27 18:38 ` Gregory Heytings
2021-10-27 18:41 ` Eli Zaretskii
2021-10-27 18:56 ` Gregory Heytings
2021-10-27 19:15 ` Eli Zaretskii
2021-10-27 19:20 ` Gregory Heytings
2021-10-28 5:56 ` Eli Zaretskii
2021-10-28 6:50 ` Gregory Heytings
2021-10-28 9:11 ` Eli Zaretskii
2021-10-28 9:37 ` Gregory Heytings
2021-10-28 9:39 ` Gregory Heytings
2021-10-28 10:00 ` Eli Zaretskii
2021-10-28 10:05 ` Gregory Heytings
2021-10-28 10:25 ` Gregory Heytings
2021-10-28 10:33 ` Eli Zaretskii
2021-10-28 11:20 ` Gregory Heytings
2021-10-28 13:26 ` Eli Zaretskii
2021-10-28 13:55 ` Gregory Heytings
2021-10-28 16:27 ` Eli Zaretskii
2021-10-28 17:06 ` Gregory Heytings
2021-10-28 17:37 ` Eli Zaretskii
2021-10-28 21:10 ` Gregory Heytings
2021-10-29 7:51 ` Eli Zaretskii
2021-10-29 10:32 ` Gregory Heytings
2021-10-29 10:54 ` Eli Zaretskii
2021-10-28 21:40 ` Lars Ingebrigtsen
2021-10-29 7:31 ` Eli Zaretskii
2021-10-29 12:51 ` Lars Ingebrigtsen
2021-10-29 13:31 ` Eli Zaretskii
2021-11-05 5:04 ` Lars Ingebrigtsen
2021-11-05 7:56 ` Eli Zaretskii [this message]
2021-11-05 13:42 ` Ligature support Lars Ingebrigtsen
2021-11-05 14:33 ` Eli Zaretskii
2021-11-05 14:38 ` Lars Ingebrigtsen
2021-11-05 15:14 ` Eli Zaretskii
2021-11-05 15:20 ` Lars Ingebrigtsen
2021-11-05 15:26 ` Lars Ingebrigtsen
2021-11-05 15:40 ` Lars Ingebrigtsen
2021-11-05 16:35 ` Eli Zaretskii
2021-11-05 15:26 ` Eli Zaretskii
2021-11-05 15:37 ` Lars Ingebrigtsen
2021-11-05 15:56 ` Lars Ingebrigtsen
2021-11-05 16:39 ` Eli Zaretskii
2021-11-05 16:34 ` Eli Zaretskii
2021-11-05 16:45 ` Lars Ingebrigtsen
2021-11-05 17:05 ` Yuri Khan
2021-11-05 17:16 ` Lars Ingebrigtsen
2021-11-05 18:54 ` Eli Zaretskii
2021-11-05 22:17 ` Lars Ingebrigtsen
2021-11-06 7:04 ` Eli Zaretskii
2021-11-06 18:02 ` Lars Ingebrigtsen
2021-11-05 20:09 ` Yuri Khan
2021-11-05 22:20 ` Lars Ingebrigtsen
2021-11-06 9:01 ` Yuri Khan
2021-11-05 17:13 ` tomas
2021-11-05 19:14 ` Eli Zaretskii
2021-11-05 19:52 ` tomas
2021-11-05 20:16 ` Werner LEMBERG
2021-11-05 20:18 ` tomas
2021-11-05 20:35 ` Eli Zaretskii
2021-11-05 20:30 ` Eli Zaretskii
2021-11-06 9:16 ` tomas
2021-11-06 9:49 ` Eli Zaretskii
2021-11-05 20:43 ` Stefan Kangas
2021-11-05 20:49 ` Eli Zaretskii
2021-11-05 17:18 ` Lars Ingebrigtsen
2021-11-05 18:55 ` Eli Zaretskii
2021-11-05 19:11 ` Eli Zaretskii
2021-11-05 22:38 ` Lars Ingebrigtsen
2021-11-05 22:50 ` Lars Ingebrigtsen
2021-11-05 23:02 ` Lars Ingebrigtsen
2021-11-06 8:32 ` Eli Zaretskii
2021-11-06 18:08 ` Lars Ingebrigtsen
2021-11-06 18:34 ` Eli Zaretskii
2021-11-06 5:23 ` Lars Ingebrigtsen
2021-11-06 8:40 ` Eli Zaretskii
2021-11-12 20:28 ` chad
2021-11-15 4:51 ` Richard Stallman
2021-11-15 6:19 ` Stefan Kangas
2021-11-18 3:50 ` Richard Stallman
2021-11-15 12:52 ` Eli Zaretskii
2021-11-06 7:12 ` Eli Zaretskii
2021-11-06 18:05 ` Lars Ingebrigtsen
2021-11-06 18:30 ` Eli Zaretskii
2021-11-06 13:25 ` Benjamin Riefenstahl
2021-11-06 13:34 ` Eli Zaretskii
2021-11-06 17:03 ` Benjamin Riefenstahl
2021-11-06 17:33 ` Eli Zaretskii
2021-10-27 19:23 ` Entering emojis Gregory Heytings
2021-10-28 5:58 ` Eli Zaretskii
2021-10-27 14:16 ` T.V Raman
2021-10-27 12:09 ` Eli Zaretskii
2021-10-27 12:27 ` Robert Pluim
2021-10-27 11:48 ` Eli Zaretskii
2021-10-27 12:36 ` Robert Pluim
2021-10-27 13:07 ` Robert Pluim
2021-10-27 13:09 ` Lars Ingebrigtsen
2021-10-27 13:26 ` Robert Pluim
2021-10-27 13:50 ` Eli Zaretskii
2021-11-08 19:52 ` chad
2021-11-08 19:58 ` Eli Zaretskii
2021-10-27 13:34 ` Eli Zaretskii
2021-10-27 15:12 ` Robert Pluim
2021-10-27 16:08 ` Eli Zaretskii
2021-10-27 17:00 ` Robert Pluim
2021-10-27 13:22 ` Eli Zaretskii
2021-10-27 13:28 ` Robert Pluim
2021-10-27 14:06 ` Stefan Kangas
2021-10-27 14:15 ` Eli Zaretskii
2021-10-27 14:22 ` Stefan Kangas
2021-10-27 15:34 ` Michael Albinus
2021-11-02 23:36 ` Jonas Bernoulli
2021-11-04 6:27 ` Lars Ingebrigtsen
2021-11-04 15:12 ` Jonas Bernoulli
2021-11-04 17:18 ` Lars Ingebrigtsen
2021-11-04 18:34 ` T.V Raman
2021-10-25 19:42 ` Gregory Heytings
2021-10-25 20:10 ` Lars Ingebrigtsen
2021-10-25 20:18 ` Lars Ingebrigtsen
2021-10-25 20:31 ` Lars Ingebrigtsen
2021-10-25 20:36 ` Matthias Meulien
2021-10-26 2:36 ` Eli Zaretskii
2021-10-25 20:54 ` T.V Raman
2021-10-26 21:20 ` Lars Ingebrigtsen
2021-10-26 21:43 ` Stefan Kangas
2021-10-27 12:45 ` Lars Ingebrigtsen
2021-10-27 14:22 ` Stefan Kangas
2021-10-27 12:01 ` Eli Zaretskii
2021-10-27 12:28 ` Lars Ingebrigtsen
2021-10-27 13:19 ` Eli Zaretskii
2021-11-02 23:40 ` Jonas Bernoulli
2021-10-27 14:38 ` Stefan Kangas
2021-10-27 15:40 ` Lars Ingebrigtsen
2021-10-27 17:11 ` Move shorthands.el to lisp/emacs-lisp/? Stefan Kangas
2021-10-28 21:28 ` Lars Ingebrigtsen
2021-10-29 5:31 ` Eli Zaretskii
2021-10-29 9:45 ` Yuri Khan
2021-10-29 10:10 ` Eli Zaretskii
2021-10-29 10:31 ` Yuri Khan
2021-10-29 10:41 ` Eli Zaretskii
2021-10-29 10:51 ` Dmitry Gutov
2021-10-29 12:37 ` Lars Ingebrigtsen
2021-10-27 15:52 ` Entering emojis Eli Zaretskii
2021-10-27 16:27 ` Stefan Kangas
2021-10-27 16:37 ` Eli Zaretskii
2021-10-27 15:56 ` Stefan Monnier
2021-10-27 16:06 ` Lars Ingebrigtsen
2021-10-27 16:20 ` Eli Zaretskii
2021-10-27 16:27 ` Stefan Kangas
2021-10-28 21:27 ` Lars Ingebrigtsen
2021-11-02 23:48 ` Jonas Bernoulli
2021-11-03 1:50 ` T.V Raman
2021-11-04 6:28 ` Lars Ingebrigtsen
2021-10-28 14:14 ` Kévin Le Gouguec
2021-10-28 14:16 ` Lars Ingebrigtsen
2021-10-28 14:31 ` Lars Ingebrigtsen
2021-10-28 14:56 ` Kévin Le Gouguec
2021-10-28 14:59 ` Lars Ingebrigtsen
2021-10-28 15:27 ` Kévin Le Gouguec
2021-10-28 21:43 ` Lars Ingebrigtsen
2021-10-29 9:32 ` Kévin Le Gouguec
2021-10-29 13:03 ` Lars Ingebrigtsen
2021-10-29 15:30 ` Kévin Le Gouguec
2021-10-29 16:01 ` Lars Ingebrigtsen
2021-10-29 16:45 ` Kévin Le Gouguec
2021-10-29 17:18 ` Lars Ingebrigtsen
2021-11-03 0:08 ` Jonas Bernoulli
2021-11-03 16:15 ` Jonas Bernoulli
2021-10-27 17:25 ` Lars Ingebrigtsen
2021-10-28 9:18 ` Lars Ingebrigtsen
2021-10-28 10:33 ` Stefan Kangas
2021-10-28 11:08 ` Lars Ingebrigtsen
2021-10-28 11:19 ` Lars Ingebrigtsen
2021-10-28 12:54 ` Eli Zaretskii
2021-10-28 12:56 ` Lars Ingebrigtsen
2021-10-28 13:32 ` Eli Zaretskii
2021-10-28 13:54 ` Lars Ingebrigtsen
2021-10-28 15:57 ` Eli Zaretskii
2021-10-28 21:49 ` Lars Ingebrigtsen
2021-10-29 5:45 ` Eli Zaretskii
2021-10-29 12:46 ` Lars Ingebrigtsen
2021-10-29 13:30 ` Eli Zaretskii
2021-10-29 13:38 ` Lars Ingebrigtsen
2021-10-29 13:55 ` Eli Zaretskii
2021-10-29 14:12 ` Lars Ingebrigtsen
2021-10-29 14:30 ` Lars Ingebrigtsen
2021-10-29 14:45 ` Lars Ingebrigtsen
2021-10-29 14:53 ` Lars Ingebrigtsen
2021-10-29 16:02 ` Eli Zaretskii
2021-10-29 16:39 ` Lars Ingebrigtsen
2021-10-29 16:01 ` Eli Zaretskii
2021-10-29 16:34 ` Lars Ingebrigtsen
2021-10-29 18:06 ` Eli Zaretskii
2021-10-29 18:23 ` Lars Ingebrigtsen
2021-10-29 19:46 ` Eli Zaretskii
2021-10-29 20:43 ` Lars Ingebrigtsen
2021-10-29 20:57 ` Lars Ingebrigtsen
2021-10-29 21:09 ` Lars Ingebrigtsen
2021-10-29 21:21 ` Lars Ingebrigtsen
2021-10-30 6:08 ` Eli Zaretskii
2021-10-30 7:06 ` Andreas Schwab
2021-11-03 18:56 ` Eli Zaretskii
2021-10-30 12:17 ` Lars Ingebrigtsen
2021-10-28 13:56 ` Robert Pluim
2021-10-28 20:44 ` Stefan Kangas
2021-10-28 21:51 ` Lars Ingebrigtsen
2021-10-28 22:34 ` Stefan Kangas
2021-10-28 22:39 ` Lars Ingebrigtsen
2021-11-03 0:35 ` Jonas Bernoulli
2021-10-28 13:30 ` Eli Zaretskii
2021-10-28 23:37 ` Stefan Kangas
2021-10-28 23:48 ` Lars Ingebrigtsen
2021-10-29 6:10 ` Eli Zaretskii
2021-10-29 6:09 ` Eli Zaretskii
2021-10-29 14:43 ` Stefan Kangas
2021-10-29 16:06 ` Eli Zaretskii
2021-10-29 17:01 ` Stefan Kangas
2022-01-29 10:23 ` Eli Zaretskii
2021-10-29 17:41 ` Daniel Martín
2021-10-29 21:46 ` Lars Ingebrigtsen
2021-10-29 22:16 ` Lars Ingebrigtsen
2021-10-30 6:19 ` Eli Zaretskii
2021-10-30 6:36 ` Eli Zaretskii
2021-10-30 12:25 ` Lars Ingebrigtsen
2021-10-30 12:30 ` Eli Zaretskii
2021-10-30 12:34 ` Lars Ingebrigtsen
2021-10-30 12:49 ` Eli Zaretskii
2021-10-30 12:20 ` Lars Ingebrigtsen
2021-10-30 6:22 ` Eli Zaretskii
2021-10-30 14:26 ` Howard Melman
2021-10-28 14:19 ` T.V Raman
2021-10-28 14:33 ` Lars Ingebrigtsen
2021-10-28 16:04 ` Eli Zaretskii
2021-11-01 19:47 ` Jonas Bernoulli
2021-11-02 2:06 ` Lars Ingebrigtsen
2021-11-03 1:27 ` Jonas Bernoulli
2021-11-03 2:07 ` Reading multiple files (was: Entering emojis) Stefan Monnier
2021-11-03 16:21 ` Jonas Bernoulli
2021-11-04 17:31 ` Entering emojis Lars Ingebrigtsen
2021-11-13 19:43 ` Problem with some new emoji in Emacs Jean Louis
2021-11-13 20:16 ` Eli Zaretskii
2021-11-13 20:49 ` Jean Louis
2021-11-14 6:35 ` Eli Zaretskii
2021-11-14 7:50 ` Jean Louis
2021-11-13 20:37 ` Stefan Monnier
2021-11-13 20:53 ` Jean Louis
2021-11-13 21:14 ` Jean Louis
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