[Webkit-unassigned] [Bug 187175] New: [WPE] Some frames are dropped when using rAF to animate an element

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Jun 29 05:00:26 PDT 2018


            Bug ID: 187175
           Summary: [WPE] Some frames are dropped when using rAF to
                    animate an element
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit WPE
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: magomez at igalia.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 343907

  --> https://bugs.webkit.org/attachment.cgi?id=343907&action=review


There's a certain situation using rAF to animate an alement where the sequence of frames rendered is not the right, which causes the animation to be flickery. I'm attaching a testcase where the problem can be reproduced.

The problem is that instead of rendering the frames in the appropriate order
we're rendering

and this happens because we're triggering schedules in the ThreadedCompositor that should wait for a pending layerFlush and it's not.

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