[Webkit-unassigned] [Bug 217897] [iOS 14] Animated WebP with transparency doesn't render properly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217897

--- Comment #3 from Alan Davalos <alanodaval at hotmail.com> ---
Thanks for your response, I've got some additional information that might be helpful:

We've done some tests on iOS 14.1 and the rendering for animated Webp seems to have improved quite a bit in that version.

For example, from the images on the reproduction I made, the first two had problems in iOS 14 and now in 14.1 the first one renders properly and the second one seems to still have some problems but at least those regarding to the background seem to have been fixed.

However, I've noticed that some larger animated WebP (over 1MB in size) seem to have a different problem now.

The problem with this kind of images is that the images seem to render in a "slow motion" of sorts.

Judging from the effect, I would guess that the processing for the animation is getting stuck at some point.

As a reference, an APNG image created using the same keyframes would render properly.

Unfortunately, I can't provide a demo for this right now as I can't make the images public but I can try preparing some in case that helps.

Also, if you think this other problem should be registered as a different bug, I can file a new bug so let me know if that would be better.

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