[Webkit-unassigned] [Bug 161566] New: Change the decoding for animated images to be asynchronous

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161566

            Bug ID: 161566
           Summary: Change the decoding for animated images to be
                    asynchronous
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com

When there are many frames or the frames are large, the memory cache keeps asks for destroying the decoded frames. Having the decoding happens at the time of drawing makes the animation stuttered. To resolve this problem, the image decoding should be moved form the main thread to a operate thread. And the frame to be displayed should be requested in advance such such that when it the frame is drawn, its decoded data is ready.

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