[Webkit-unassigned] [Bug 84393] New: Avoid calling updateCompositingLayers() more than once before each render

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84393

           Summary: Avoid calling updateCompositingLayers() more than once
                    before each render
           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: simon.fraser at apple.com
                CC: vangelis at chromium.org, enne at google.com


Pages that repeatedly call offsetWidth then change style will force a lot of unnecessary compositing updates. We should avoid them, and figure out a way to only update compositing layers before painting.

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