[Webkit-unassigned] [Bug 58840] New: [chromium] Decouple layer visibility calculations from render surfaces / computed draw transforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58840

           Summary: [chromium] Decouple layer visibility calculations from
                    render surfaces / computed draw transforms
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jamesr at chromium.org
                CC: jamesr at chromium.org, vangelis at chromium.org,
                    enne at google.com, nduca at chromium.org
            Blocks: 58799


Currently in ContentLayerChromium we determine the visible portion of the layer using the render surface scissor rect and the computed draw transform for the layer.  In the multithreaded compositor world, however, we'll be generating render surfaces and the final draw transform in the compositor thread since they might change from frame to frame (due to animation or whatnot).

We need to figure out some way to calculate visibility on the main thread, preferably without having to duplicate all of the draw transform + render surface bound calculations.

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