[Webkit-unassigned] [Bug 176089] [GTK] Fix playback of imgur GIFs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176089

Jer Noble <jer.noble at apple.com> changed:

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                 CC|                            |jer.noble at apple.com

--- Comment #3 from Jer Noble <jer.noble at apple.com> ---
In bug #176118, I think I discovered a clue about what might be causing the choppy decode during the first play through. The image-decoders/ decoders used on GTK+ will attempt to decode the entire image frame when asked whether the frame is "complete" (i.e., has all its data available) or what the frame's duration is. These operations happen on the main thread, so the decode is synchronous, and depending on the amount of time required to decode the frame, will cause playback to miss one-or-more subsequent frames, or for those frames to be delivered late.

An interesting area of investigation would be to see if "parsing" of image data can be separated from "decoding" of frames, so that answers to the questions of "is this frame complete" and "what is this frame's duration" can be answered synchronously and cheaply without requiring a full decode of the frame.

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