[Webkit-unassigned] [Bug 107359] New: [Mac] Use pageScaleFactor * deviceScaleFactor in requiresTiledLayer() and computePixelAlignment() of GraphicsLayerCA.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107359

           Summary: [Mac] Use pageScaleFactor * deviceScaleFactor in
                    requiresTiledLayer() and computePixelAlignment() of
                    GraphicsLayerCA.
           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


Currently GraphicsLayerCA uses pageScaleFactor in requiresTiledLayer() and
computePixelAlignment(), but we must use pageScaleFactor * deviceScaleFactor in
them.
It is because:
1. requiresTiledLayer() uses the scale to compute an actual layer size in the device pixel unit.
2. computePixelAlignment() uses the scale to compute an aligned layer position in the device pixel unit.

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