[Webkit-unassigned] [Bug 22280] CG GIF decoder uses too much CPU

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=22280


pkasting at google.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|Regression                  |
            Summary|REGRESSION (r37605-37698):  |CG GIF decoder uses too much
                   |Increased animated GIF      |CPU
                   |resource usage              |




------- Comment #6 from pkasting at google.com  2008-12-15 13:00 PDT -------
I'm morphing this bug to make it clear that the underlying issue is the CG
decoder (as far as I can tell), and that this is not something which worked
great before but doesn't anymore.  From comment 1, the "old behavior" peaked
the test system at 70% CPU.  Animated GIFs should consume less than 5% of a
CPU.

I believe my findings in comment 5 indicate that for this image, the CG decoder
is redecoding from the beginning on every frame.  This shouldn't be needed when
the decoder still has references to previous frames.

The framework on bug 22108 is now in place, if it becomes useful in the future;
however, without fixing the behavior noted in comment 5, it won't help
anything.


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