From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: ghe@sdf.org, larsi@gnus.org, emacs-devel@gnu.org
Subject: Re: Suggest installing more fonts?
Date: Sat, 17 Oct 2020 17:08:00 +0300 [thread overview]
Message-ID: <835z79t073.fsf@gnu.org> (raw)
In-Reply-To: <jwv362dq83w.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Sat, 17 Oct 2020 09:49:09 -0400)
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: ghe@sdf.org, larsi@gnus.org, emacs-devel@gnu.org
> Date: Sat, 17 Oct 2020 09:49:09 -0400
>
> > Emacs already knows not to search the available fonts for a character
> > that it already tried to display and failed to find a suitable font.
> > We should probably reuse the information which says a character
> > doesn't have a font for finding such characters and marking them.
>
> I assumed that Emacs knows it's choosing "tofu" for any particular
> glyph, regardless if that's the result of a long search or the reuse of
> some previous search.
The glyph information (assuming you mean 'struct glyph') is ephemeral,
and is not recorded between redisplay cycles. It stays stored in the
"current" glyph matrix, but Emacs almost never consults that for
anything except comparison with "desired" matrix, because the current
matrix can easily become outdated.
> If it doesn't (e.g. it just reuses "the same glyph as last time this
> char was used with this face"), then indeed it might be a bit more
> tricky, but I'm sure it can be made acceptably cheap (both in terms of
> memory&CPU resources and in terms of code complexity).
AFAIR, this is indeed based on face information (and the fact that
there's no font is recorded in the face struct), but these faces
aren't exposed to Lisp, they are created and used internally. Still,
the information should be reachable, I think.
next prev parent reply other threads:[~2020-10-17 14:08 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-16 10:54 Suggest installing more fonts? Lars Ingebrigtsen
2020-10-16 11:07 ` Eli Zaretskii
2020-10-16 11:30 ` Gregory Heytings via Emacs development discussions.
2020-10-16 12:50 ` Eli Zaretskii
2020-10-16 12:59 ` Gregory Heytings via Emacs development discussions.
2020-10-16 13:13 ` Eli Zaretskii
2020-10-16 14:38 ` Gregory Heytings via Emacs development discussions.
2020-10-16 15:48 ` Eli Zaretskii
2020-10-16 16:09 ` Gregory Heytings via Emacs development discussions.
2020-10-16 18:48 ` Eli Zaretskii
2020-10-16 19:40 ` Stefan Monnier
2020-10-17 6:57 ` Eli Zaretskii
2020-10-17 13:49 ` Stefan Monnier
2020-10-17 14:08 ` Eli Zaretskii [this message]
2020-10-17 15:04 ` Stefan Monnier
2020-10-17 15:18 ` Eli Zaretskii
2020-10-16 13:24 ` Lars Ingebrigtsen
2020-10-16 14:08 ` Gregory Heytings via Emacs development discussions.
2020-10-16 15:34 ` Eli Zaretskii
2020-10-16 15:51 ` Gregory Heytings via Emacs development discussions.
2020-10-16 13:24 ` Lars Ingebrigtsen
2020-10-16 13:30 ` Rudolf Schlatte
2020-10-17 6:14 ` Lars Ingebrigtsen
2020-10-16 14:41 ` Eli Zaretskii
2020-10-17 6:23 ` Lars Ingebrigtsen
2020-10-17 8:55 ` Eli Zaretskii
2020-10-18 8:03 ` Lars Ingebrigtsen
2020-10-18 15:21 ` Eli Zaretskii
2020-10-19 8:31 ` Lars Ingebrigtsen
2020-10-19 14:50 ` Eli Zaretskii
2020-10-20 10:28 ` Lars Ingebrigtsen
2020-10-20 14:31 ` Eli Zaretskii
2020-10-21 10:46 ` Lars Ingebrigtsen
2020-10-21 11:31 ` Michael Albinus
2020-10-21 11:58 ` Stefan Kangas
2020-10-21 14:54 ` Eli Zaretskii
2020-10-21 16:03 ` tofu-help-mode (was: Suggest installing more fonts?) Stefan Monnier
2020-10-22 12:07 ` tofu-help-mode Lars Ingebrigtsen
2020-10-22 15:21 ` tofu-help-mode Stefan Monnier
2020-10-23 10:46 ` tofu-help-mode Lars Ingebrigtsen
2020-10-21 17:46 ` Suggest installing more fonts? Michael Albinus
2020-10-21 18:14 ` Eli Zaretskii
2020-10-22 7:27 ` Michael Albinus
2020-10-22 13:09 ` Eli Zaretskii
2020-10-23 16:53 ` Michael Albinus
2020-10-23 18:13 ` Eli Zaretskii
2020-10-25 11:47 ` Michael Albinus
2020-10-25 15:19 ` Eli Zaretskii
2020-10-21 17:25 ` Juri Linkov
2020-10-21 11:59 ` Basil L. Contovounesios
2020-10-21 12:05 ` Lars Ingebrigtsen
2020-10-21 12:31 ` Stephen Berman
2020-10-21 14:47 ` Eli Zaretskii
2020-10-21 20:19 ` Rasmus
2020-10-22 2:34 ` Eli Zaretskii
2020-10-22 12:34 ` Rasmus
2020-10-22 13:35 ` Eli Zaretskii
2020-10-21 20:19 ` Rasmus
2020-10-22 11:32 ` Lars Ingebrigtsen
2020-10-22 12:02 ` Gregory Heytings via Emacs development discussions.
2020-10-22 12:08 ` Lars Ingebrigtsen
2020-10-22 12:29 ` Gregory Heytings via Emacs development discussions.
2020-10-22 13:31 ` Eli Zaretskii
2020-10-23 3:49 ` Richard Stallman
2020-10-23 6:59 ` Eli Zaretskii
2020-10-23 8:28 ` Andreas Schwab
2020-10-23 11:01 ` Eli Zaretskii
2020-10-23 15:50 ` Andreas Schwab
2020-10-23 16:38 ` Stefan Monnier
2020-10-23 18:03 ` Eli Zaretskii
2020-10-23 18:43 ` Robert Pluim
2020-10-23 19:31 ` Eli Zaretskii
2020-10-24 9:35 ` Robert Pluim
2020-10-23 10:45 ` Lars Ingebrigtsen
2020-10-23 11:07 ` Eli Zaretskii
2020-10-23 14:59 ` Stefan Monnier
2020-10-23 17:56 ` Eli Zaretskii
2020-10-23 18:13 ` Stefan Monnier
2020-10-23 18:23 ` Eli Zaretskii
2020-10-23 18:36 ` Stefan Monnier
2020-10-23 18:18 ` Gregory Heytings via Emacs development discussions.
2020-10-22 13:16 ` Eli Zaretskii
2020-10-22 13:40 ` Gregory Heytings via Emacs development discussions.
2020-10-22 13:52 ` Eli Zaretskii
2020-10-22 14:20 ` Gregory Heytings via Emacs development discussions.
2020-10-22 15:50 ` Eli Zaretskii
2020-10-16 18:48 ` Stefan Monnier
2020-10-16 19:13 ` Eli Zaretskii
2020-10-16 19:37 ` Stefan Monnier
2020-10-17 6:37 ` Eli Zaretskii
2020-10-17 13:44 ` Stefan Monnier
2020-10-16 19:42 ` Gregory Heytings via Emacs development discussions.
2020-10-16 19:49 ` Stefan Monnier
2020-10-16 22:14 ` Gregory Heytings via Emacs development discussions.
2020-10-16 22:35 ` Stefan Monnier
2020-10-16 23:02 ` Gregory Heytings via Emacs development discussions.
2020-10-17 7:46 ` Eli Zaretskii
2020-10-17 11:21 ` Gregory Heytings via Emacs development discussions.
2020-10-17 12:13 ` Eli Zaretskii
2020-10-17 13:09 ` Gregory Heytings via Emacs development discussions.
2020-10-17 13:33 ` Eli Zaretskii
2020-10-17 16:09 ` Gregory Heytings via Emacs development discussions.
2020-10-17 16:30 ` Eli Zaretskii
2020-10-17 17:37 ` Gregory Heytings via Emacs development discussions.
2020-10-17 17:58 ` Eli Zaretskii
2020-10-17 18:36 ` Gregory Heytings via Emacs development discussions.
2020-10-17 18:50 ` Eli Zaretskii
2020-10-17 18:56 ` Eli Zaretskii
2020-10-17 19:18 ` Gregory Heytings via Emacs development discussions.
2020-10-17 19:33 ` Eli Zaretskii
2020-10-18 8:06 ` Lars Ingebrigtsen
2020-10-18 14:55 ` Eli Zaretskii
2020-10-17 17:30 ` Drew Adams
2020-10-18 4:12 ` Richard Stallman
2020-10-18 14:45 ` Eli Zaretskii
2020-10-20 22:46 ` Stephen Leake
2020-10-17 6:31 ` Lars Ingebrigtsen
2020-10-17 9:08 ` Eli Zaretskii
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