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

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187175

            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

testcase

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
1-2-3-4-5-6
we're rendering
1-1-2-4-4-5-7-7

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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