[Webkit-unassigned] [Bug 57960] New: [Chromium] Accelerated 2D Canvas is slow to execute putImageData

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=57960

           Summary: [Chromium] Accelerated 2D Canvas is slow to execute
                    putImageData
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: junov at chromium.org


In Chromium, with accelerated Canvas enabled, display a web page that relies heavily on putImageData for rendering such as the following Chrome experiment:
http://www.chromeexperiments.com/detail/back-to-visuals/?f=

Notice that it runs much, much slower than with the accelerated canvas disabled.

The current implementation of putImageData forces a readback from the GPU. The readback would not be necessary with a GPU-aware implementation.

Related Chromium bug:
http://code.google.com/p/chromium/issues/detail?id=78176

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