[Webkit-unassigned] [Bug 82251] New: [chromium] Layers should should know their visibility outside their content bounds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82251

           Summary: [chromium] Layers should should know their visibility
                    outside their content bounds
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: epenner at chromium.org
                CC: enne at google.com, nduca at chromium.org,
                    danakj at chromium.org


Currently we clip the visible rect to layers content bounds here:

CCLayerTreeHostCommon.cpp:
...
CCLayerTreeHostCommon::calculateVisibleRect
...
layerRect.intersect(layerBoundRect);
...

This prevents us from doing pre-painting when a layer is isn't visible yet. We should change this rect to be unclipped if we can, and modify usage of this rect to clip it if unnecessary. Alternatively we could store another unclipped rect along-side the clipped rect.

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