[Webkit-unassigned] [Bug 109179] New: [CoordGfx] Regression from r135212: big layers with transform animations sometime fail to render tiles.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109179

           Summary: [CoordGfx] Regression from r135212: big layers with
                    transform animations sometime fail to render tiles.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: noam at webkit.org
                CC: kbalazs at webkit.org, luxtella at company100.net,
                    rafael.lobo at openbossa.org


Created an attachment (id=187072)
 --> (https://bugs.webkit.org/attachment.cgi?id=187072&action=review)
Test case - looks green in chrome, red in CoordGfx-based MiniBrowser

In https://bugs.webkit.org/show_bug.cgi?id=102313, we added an optimization that allows releasing tiles of transform-animated layers when they are outside the viewport.
This optimization works in some cases; But in slower animations when the layer has more than one tile and nothing else happens during the animation, the new tiles would not be recreated until something triggers a layout/render. This is because the animation works completely in the UI process, and nobody triggers CoordinatedLayerTreeHost to flush layer changes or check for new tiles.

A possible solution would be to periodically compute the visible rect when a transform animation is ongoing.

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