[Webkit-unassigned] [Bug 53468] New: Handle gpu-backed images in getUnmultipliedImageData()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=53468

           Summary: Handle gpu-backed images in getUnmultipliedImageData()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: reed at google.com
                CC: mdelaney at apple.com


In Skia platform, ImageBuffer::getUnmultipliedImageData() assumes that the image is always backed by memory pixels. However, if the image is actually backed by a gpu (e.g. FBO), then the current code will crash as bitmap.getPixels() will return NULL. The fix is to relies on SkDevice::readPixels(), which abstracts that from the caller. It will return the pixels in question correctly, regardless of a raster or gpu backend.

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