[Webkit-unassigned] [Bug 93036] New: [BlackBerry] Accelerated compositing checkerboard never resolves

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93036

           Summary: [BlackBerry] Accelerated compositing checkerboard
                    never resolves
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit BlackBerry
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: anilsson at rim.com
                CC: tonikitoo at webkit.org


This bug deals with a very specific situation where checkerboard would never resolve. In LayerTiler, render jobs are used for reactive rendering, to make sure checkerboard does not stay on screen. When checkerboard is detected on the compositing thread, a render job is scheduled to make sure it's resolved. Proactive rendering is handled by the prefill mechanism, ultimately falling back on GraphicsLayerClient::contentsVisible().

If the entire layer was invalidated, the render jobs were cleared, making us entirely dependent on the implementation of GraphicsLayerClient::contentsVisible() to determine which tiles should be rendered.

Fixed by not clearing visibility jobs when the entire layer is invalidated, thus making us more robust against contentsVisible implementation, even allowing it to always return false and make the layer rely entirely on reactive rendering.

Also removed dead code related to the deprecated LayerTiler::m_tilesWebKitThread mechanism, which has been replaced by the render jobs.

PR 187458

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