[Webkit-unassigned] [Bug 56431] New: Add support for preserveDrawingBuffer context creation attribute

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=56431

           Summary: Add support for preserveDrawingBuffer context creation
                    attribute
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbr at google.com
                CC: zmo at google.com, jbauman at chromium.org


The preserveDrawingBuffer context creation attribute is currently unimplemented, causing WebGL conformance suite failures. The preserveDrawingBuffer=false behavior needs to be properly supported, which requires that operations against a WebGL-rendered canvas like toDataURL, readPixels, drawImage and texImage2D return transparent black once the canvas's contents have been presented to the compositor. The current behavior, which matches preserveDrawingBuffer=true, also needs to be officially supported.

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