[Webkit-unassigned] [Bug 75142] New: [chromium] Shadowing of the Canvas' backing doesn't work with BGRA textures

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75142

           Summary: [chromium] Shadowing of the Canvas' backing doesn't
                    work with BGRA textures
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: vangelis at chromium.org
                CC: kbr at google.com, jamesr at chromium.org, husky at google.com,
                    twiz at chromium.org


Canvas2DLayerChromium::updateCompositorResources() calls glCopyTexImage2D to copy from the canvas backing texture to the texture used by the compositor. However, this copy can only work if the canvas backing is an RGBA texture and will fail for BGRA (the BGRA extension doesn't support glCopyTexImage2D). We need an alternative mechanism to do the copy either by explicitly drawing a textured quad onto the bound fbo or using the command buffer extension that twiz@ is working on.

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