[Webkit-unassigned] [Bug 96053] New: Don't copy canvas texture during composite if the canvas content didn't change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=96053

           Summary: Don't copy canvas texture during composite if the
                    canvas content didn't change
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kangyuan.shu at intel.com


During the process of composite, the canvas element would copy its latest content from back texture to front one, which would display on screen.
We could check whether canvas content is modified since last composite, and save the copy if the content doesn't change.

This can help a little on performance for some cases that typically have a canvas element as background.
One case is FishIETank (http://ie.microsoft.com/testdrive/Performance/FishIETank/), the background canvas is only drawn once when the window size changed. 

-Kang Yuan

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