[Webkit-unassigned] [Bug 58052] New: REGRESSION (WebKit2): Accelerated compositing happens on the main thread on Windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58052

           Summary: REGRESSION (WebKit2): Accelerated compositing happens
                    on the main thread on Windows
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: NEW
          Keywords: NeedsRadar, PlatformOnly, Regression
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: simon.fraser at apple.com, cmarrin at apple.com


In WebKit2 on Windows, accelerated compositing happens on the main thread. This means that pauses on the main thread can result in stuttering animation (e.g., bug 57956).

We should move compositing off the main thread so that it isn't affected by the business of the main thread. This is how accelerated compositing works in WebKit1, and on Mac.

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