[Webkit-unassigned] [Bug 103357] New: [Qt] Coordinated Graphics: flash due to wrong transform and clipping.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103357

           Summary: [Qt] Coordinated Graphics: flash due to wrong
                    transform and clipping.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


When I tested snowstack in Qt WK2, I experienced flashing.
http://www.satine.org/research/webkit/snowleopard/snowstack.html

In the detail, when we press the right arrow key, gallery animation smoothly shifts on the right direction. In animation, whole screen shifts the left-top side sometimes with wrong clipping of the right-bottom side.

It is because LayerTreeRenderer::paintToCurrentGLContext receives wrong matrix and clipRect. QSGNode may compute not well. I don't know why yet.
void LayerTreeRenderer::paintToCurrentGLContext(const TransformationMatrix& matrix, float opacity, const FloatRect& clipRect, TextureMapper::PaintFlags PaintFlags)

I'll be pleasure if other forks fix it.

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