[Webkit-unassigned] [Bug 73478] New: [chromium] Change layer visibleContentRect to visibleContentRegion.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73478

           Summary: [chromium] Change layer visibleContentRect to
                    visibleContentRegion.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: danakj at chromium.org


Store a WebCore::Region instead of IntRect for the visible region of a layer.

The bounding rect is still given to prepareToUpdate() and drawTiles() for now.

Justifiaction for this change:
This patch doesn't do anything more clever with Regions than is currently done with rects. A separate CL will work on CCLayerTreeHostCommon::calculateVisibleRegion() to exclude regions occluded by opaque layers. Then later we can pass the the Region to prepareToUpdate and it can skip occluded tiles within a layer (pending bug #71869). Draw culling can also use this to cull more tiles.

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