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Re: How to find out whether an image is displayed anywhere?
From: |
Stefan Monnier |
Subject: |
Re: How to find out whether an image is displayed anywhere? |
Date: |
Mon, 04 Jul 2011 15:15:54 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
>> Or maybe better: after the animation timer fires don't
>> change the image yet but instead only remove the fontified property and
>> then change the image from fontification-functions).
> I'm not familiar (at all) with the jit-lock functions, but if you think
> that's possible, I'm all for it. :-) But I'm not the person to
> implement something like that.
> It sounds like it could be kept nicely local to image.el, though, so the
> users of the animated pictures don't have to care.
Indeed. It would look something like:
- change the code that updates the image so that instead of actually
updating the image, it just sets a `image-upon-redisplay-function'
text-property on the image, whose value is a function that actually
updates the image.
- call (jit-lock-register #'image-update-animations) somewhere.
- write image-update-animations which just looks for the
image-upon-redisplay-function properties in the specified region and
calls the corresponding function.
There are still some issues with respect to timer management (you may
want not to use a repeating timer but instead to re-arm the timer
manually from the image-upon-redisplay-function).
Stefan
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