From: Eli Zaretskii <eliz@gnu.org>
To: Po Lu <luangruo@yahoo.com>
Cc: tomas@tuxteam.de, monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Emacs canvas support
Date: Sat, 02 May 2020 09:51:24 +0300 [thread overview]
Message-ID: <834ksyvngz.fsf@gnu.org> (raw)
In-Reply-To: <87k11v1bjo.fsf@yahoo.com> (message from Po Lu on Sat, 02 May 2020 07:27:07 +0800)
> From: Po Lu <luangruo@yahoo.com>
> Cc: tomas@tuxteam.de, monnier@iro.umontreal.ca, emacs-devel@gnu.org
> Date: Sat, 02 May 2020 07:27:07 +0800
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > I think the information needs to be recorded in the glyph structure
> > that represents a canvas.
>
> I have a canvas field inside `struct glyph' that points to the canvas
> object.
It is not a good idea to have pointers in the glyph structure. (Yes,
xwidget uses that, but don't take example from that, please.) A glyph
should be self-describing from the metrics POV. If you need
additional information (beyond the basic metrics), use the example of
images and faces: we cache the objects and record their cache ID in
the glyph.
> What I'm trying to do right now is track the position of the
> canvases on-screen, so I can draw them separately from redisplay.
My suggestion is not to "draw separately from redisplay". I don't see
how this could work, unless you also modify extensively how the second
phase of redisplay, the one entered via update_frame and
update_window, works.
next prev parent reply other threads:[~2020-05-02 6:51 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <875zdikdge.fsf.ref@yahoo.com>
2020-04-29 6:34 ` Emacs canvas support Po Lu via Emacs development discussions.
2020-04-29 8:24 ` Eli Zaretskii
2020-04-29 9:57 ` Po Lu
2020-04-29 10:10 ` Eli Zaretskii
2020-04-29 10:22 ` Po Lu
2020-04-29 10:27 ` Po Lu via Emacs development discussions.
2020-04-29 11:47 ` Eli Zaretskii
2020-04-29 10:35 ` Eli Zaretskii
2020-04-29 10:41 ` Po Lu
2020-04-29 11:51 ` Eli Zaretskii
2020-04-29 12:12 ` Po Lu
2020-04-29 16:14 ` David Engster
2020-04-29 16:54 ` Eli Zaretskii
2020-04-29 17:16 ` tomas
2020-04-29 17:27 ` Eli Zaretskii
2020-04-29 17:38 ` Eli Zaretskii
2020-04-30 13:11 ` Arthur Miller
2020-04-30 14:18 ` Eli Zaretskii
2020-04-30 14:58 ` Arthur Miller
2020-04-30 17:30 ` Eli Zaretskii
2020-05-01 14:32 ` Arthur Miller
2020-04-29 18:51 ` tomas
2020-04-29 19:03 ` Eli Zaretskii
2020-04-29 19:08 ` tomas
2020-04-29 19:25 ` Eli Zaretskii
2020-04-29 19:59 ` tomas
2020-04-30 1:19 ` Stefan Monnier
2020-04-30 6:55 ` tomas
2020-04-30 12:03 ` Stefan Monnier
2020-04-30 12:50 ` tomas
2020-04-30 8:04 ` Po Lu
2020-04-30 12:08 ` Stefan Monnier
2020-04-30 13:55 ` Eli Zaretskii
2020-05-01 23:27 ` Po Lu
2020-05-02 6:51 ` Eli Zaretskii [this message]
2020-04-30 13:46 ` Eli Zaretskii
2020-04-30 14:37 ` Stefan Monnier
2020-04-30 17:27 ` Eli Zaretskii
2020-04-30 18:22 ` Stefan Monnier
2020-04-30 18:42 ` Eli Zaretskii
2020-04-30 14:27 ` Drew Adams
2020-04-30 13:33 ` Eli Zaretskii
2020-04-30 13:52 ` Arthur Miller
2020-04-29 19:23 ` David Engster
2020-04-30 13:29 ` Eli Zaretskii
2020-04-30 6:52 ` Corwin Brust
2020-04-29 17:08 ` Eli Zaretskii
2020-04-29 20:14 ` David Engster
2020-04-30 13:35 ` Eli Zaretskii
2020-04-29 20:48 ` Juri Linkov
2020-04-30 2:36 ` Eli Zaretskii
2020-04-30 20:20 ` Juri Linkov
2020-05-01 6:01 ` Eli Zaretskii
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