[Webkit-unassigned] [Bug 27308] New: Idea: Transcode GIFs to a better format internally

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=27308

           Summary: Idea: Transcode GIFs to a better format internally
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://en.wikipedia.org/wiki/File:Tidal_lock.gif
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pkasting at google.com
                CC: hyatt at apple.com, mrowe at apple.com


The GIF given in the URL field uses lots of CPU even on the open-source
decoders.  Perhaps it's just blindly having each frame fully independent from
the prior frames, which, when combined with a larger image size and a short
frame time, means nearly unavoidable CPU use.

bdash had an interesting suggestion on IRC, which was to transcode the GIF
internally, so that we could use something less CPU- and memory-intensive after
paying the decode cost once.  I'm not sure what format would be appropriate but
surely in the twenty years since GIF we've created something better.  All I
could think of was APNG (which would require adding support for APNG).

This would also help bug 22280.

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