[Webkit-unassigned] [Bug 64480] New: Speed up RenderLayer::updateLayerPositions when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64480

           Summary: Speed up RenderLayer::updateLayerPositions when
                    scrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org
                CC: jamesr at chromium.org


On a table where each cell has overflow: hidden, each cell has its own RenderLayer (has they have an overflow clip). Thus when scrolling, we spend a significant amount of time in RenderLayer::updateLayerPositions.

This time is mostly spend recalculating the repaint rectangles and the goal of this bug is to avoid doing a recalculation when it is not needed.

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