[Webkit-unassigned] [Bug 74370] New: Hardware-backed renderLayer could avoid repainting during a positioned movement layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=74370

           Summary: Hardware-backed renderLayer could avoid repainting
                    during a positioned movement layout
           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: simon.fraser at apple.com, jamesr at chromium.org,
                    enne at google.com
            Blocks: 50417


The current logic always repaints the old and the new position of the positioned object as part of RenderLayer::updateLayerPositions. However if we have a backing, we could be able to just recomposite and avoid the repaint invalidation.

This was seen as part of http://jsbin.com/ulofav where several repaints can be seen on the animated div to be related to the RenderLayer logic after layouting the div.

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