[Webkit-unassigned] [Bug 111144] New: Incremental parsing and decoding in GIFImageReader

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111144

           Summary: Incremental parsing and decoding in GIFImageReader
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hclam at google.com


This means that GIFImageReader can parse (count frame) and decode a GIF file in one pass. The code currently do frame counting and decoding separately. The frame counting is particularly bad and has O(n^2) behavior on a slow network. By doing parse plus decode in one pass we can efficiently decode a GIF file. This also enables random frame seeking and deferred decoding for GIF.

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