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bug#14700: 24.3.50; Animated ImageMagick images doesn't work
From: |
Lars Magne Ingebrigtsen |
Subject: |
bug#14700: 24.3.50; Animated ImageMagick images doesn't work |
Date: |
Thu, 15 Aug 2013 15:59:10 +0200 |
User-agent: |
Gnus/5.130008 (Ma Gnus v0.8) Emacs/24.3.50 (gnu/linux) |
Glenn Morris <rgm@gnu.org> writes:
> There's an "animate" command-line program that is part of ImageMagick,
> and it seems to do fine on the examples from
> http://www.imagemagick.org/Usage/anim_basics/
>
> So maybe the source of that will have clues...
Thanks. I've started reading the source code now. Unfortunately, it's
written in an oldee-stylee C manner, meaning that no function is less
than 1500 lines... *sigh*
I've looked at Chong's code in gif_load again, though, and I think I
understand what's going on now. Animated gifs are basically just a
series of normal gifs, but wherever there's a transparent gif, we're
supposed to show the data from the previous gif. So to display image X,
we have to compute all images from 0 to X and apply the transparencies.
Doing this in imagemagick_load in the same manner shouldn't be too
difficult, I think. The information is available -- i.e., we just need
to know what the transparent colour is, and then the rest is just
looping and constructing the resulting image.
Reusing the code in gif_load directly doesn't seem like the best option
(it's creating X structures directly, if I interpret it correctly), so I
think I'll have a whack at implementing a imagemagick_compute_scene
function by peeking at Chong's code heavily.
--
(domestic pets only, the antidote for overdose, milk.)
No Gnus T-Shirt for sale: http://ingebrigtsen.no/no.php
and http://lars.ingebrigtsen.no/2013/08/twenty-years-of-september.html
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/14
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Glenn Morris, 2013/08/14
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work,
Lars Magne Ingebrigtsen <=
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/15
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/15
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/15
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/15
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/16
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Glenn Morris, 2013/08/16
- bug#14700: 24.3.50; Animated ImageMagick images doesn't work, Lars Magne Ingebrigtsen, 2013/08/17