From: "Clément Pit--Claudel" <clement.pit@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>, Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Redisplay hook
Date: Mon, 4 Jul 2016 12:07:39 -0400 [thread overview]
Message-ID: <577A89CB.7050502@gmail.com> (raw)
In-Reply-To: <jwvmvlx978s.fsf-monnier+emacs@gnu.org>
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On 2016-07-04 03:55, Stefan Monnier wrote:
> I guess part of the question is what would be the use of such a hook.
> The difference between a pre-redisplay-hook and a
> post-redisplay-hook is not very large since most of the result of
> redisplay is "invisible" to Elisp.
Hi Stefan,
My main use case is described above in this thread; it's a very convenient way to generate relatively compact, but accurate, emacs screencasts. We don't currently have such a facility. Arthur's excellent https://github.com/Malabarba/camcorder.el comes close, but it still depends on recordmydesktop, an external application that records frames at a fixed rate. This means it sometimes misses frames, or captures too many, or shows intermediate display states.
With a post-redisplay hook, I can let emacs drive the capture process. Here's an example: http://web.mit.edu/cpitcla/www/emacs-screencast.gif (as I mentioned earlier in the thread, notice the xref pulsing and the M-x butterfly animation)
Additionally, since Emacs is driving, I can record plenty of per-frame data, such as which key is being pressed with each frame. Here's an example, which was fairly easy to assemble using this new hook and a bit of ImageMagick: http://web.mit.edu/cpitcla/www/emacs-screencast-annot.gif (it may take a bit of time to load). What do you think of the result?
I think a feature to generate such annotated screencasts would be very nice. I'll be happy to contribute the lisp code if we can find a nice way to add the necessary hooks.
Clément.
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next prev parent reply other threads:[~2016-07-04 16:07 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-02 19:24 Redisplay hook Clément Pit--Claudel
2016-07-03 3:27 ` Eli Zaretskii
2016-07-03 4:36 ` Clément Pit--Claudel
2016-07-03 7:45 ` Eli Zaretskii
2016-07-03 14:23 ` Clément Pit--Claudel
2016-07-03 14:51 ` Clément Pit--Claudel
2016-07-03 15:37 ` Eli Zaretskii
2016-07-04 0:05 ` Clément Pit--Claudel
2016-07-04 2:41 ` Eli Zaretskii
2016-07-04 4:31 ` Clément Pit--Claudel
2016-07-04 14:47 ` Eli Zaretskii
2016-07-04 16:14 ` Clément Pit--Claudel
2016-07-04 16:24 ` Eli Zaretskii
2016-07-04 7:55 ` Stefan Monnier
2016-07-04 14:52 ` Eli Zaretskii
2016-07-04 16:07 ` Clément Pit--Claudel [this message]
2016-07-04 20:37 ` Robert Weiner
2016-07-04 21:00 ` Clément Pit--Claudel
2016-07-04 21:28 ` Robert Weiner
2016-07-04 21:50 ` Clément Pit--Claudel
2016-07-04 21:29 ` Drew Adams
2016-07-04 21:36 ` Clément Pit--Claudel
2016-07-04 21:57 ` raman
2016-07-04 22:11 ` Clément Pit--Claudel
2016-07-05 22:59 ` Richard Stallman
2016-07-05 23:47 ` Clément Pit--Claudel
2016-07-03 22:34 ` Richard Stallman
2016-07-04 0:09 ` Clément Pit--Claudel
2016-07-04 2:42 ` Eli Zaretskii
2016-07-04 0:22 ` Mark Oteiza
2016-07-04 2:42 ` Eli Zaretskii
2016-07-04 7:59 ` Andreas Schwab
2016-07-04 14:52 ` Eli Zaretskii
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