[Webkit-unassigned] [Bug 89937] New: [Qt] Use premultiplied alpha when extracting image data in WebGL

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89937

           Summary: [Qt] Use premultiplied alpha when extracting image
                    data in WebGL
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: noam.rosenthal at nokia.com
                CC: luxtella at company100.net


In GraphicsContext3DQt, we convert the native QPixmap to QImage::Format_ARGB32, and then pass AlphaDoPremultiply as an argument to packPixels.
This means that if the image was originally premultiplied, the code path would convert it to unpremultiplied and then back to premultiplied.
Instead, we should use QImage::Format_ARGB32_Premultiplied when premultiplyAlpha is true.

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