[Webkit-unassigned] [Bug 62908] New: Optimization: avoid call to clearRect() when bgColor is valid when painting the root background in RenderBoxModelObject::paintFillLayerExtended

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=62908

           Summary: Optimization: avoid call to clearRect() when bgColor
                    is valid when painting the root background in
                    RenderBoxModelObject::paintFillLayerExtended
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: una.sabovic at palm.com


When root layers base color is fully transparent backgroundRect was cleared before bgColor is applied.
Instead of clearing the rect we apply CompositeCopy operation when painting the background color.

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