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 09:57:44 +0300 [thread overview]
Message-ID: <834kmtuyon.fsf@gnu.org> (raw)
In-Reply-To: <jwvpn5irmen.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Fri, 16 Oct 2020 15:40:11 -0400)
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Gregory Heytings <ghe@sdf.org>, larsi@gnus.org, emacs-devel@gnu.org
> Date: Fri, 16 Oct 2020 15:40:11 -0400
>
> > Instead, it is much easier to have a feature implemented in Lisp that
> > would detect characters with no font glyphs and put help-echo on them.
> > We have infrastructure for such features in jit-lock.el.
>
> Indeed. And we can make this very efficient if the redisplay stashes
> in some Lisp var the chars-with-locations of the tofu it generates.
I think relying on such a trace variable would be unreliable, because
you can never predict which parts of the window will be actually
redisplayed, and the display engine can only leave the trace about
those parts where it tried to find a font glyph for a character.
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. It
cannot be too expensive, I think.
next prev parent reply other threads:[~2020-10-17 6:57 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 [this message]
2020-10-17 13:49 ` Stefan Monnier
2020-10-17 14:08 ` Eli Zaretskii
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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