[Webkit-unassigned] [Bug 238999] [GTK][WPE] Timestamps delivered to requestAnimationFrame callbacks do not reflect the display refresh that triggered them

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238999

Chris Lord <clord at igalia.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED
           Assignee|webkit-unassigned at lists.web |clord at igalia.com
                   |kit.org                     |

--- Comment #1 from Chris Lord <clord at igalia.com> ---
Created attachment 457063

  --> https://bugs.webkit.org/attachment.cgi?id=457063&action=review

Frame times under a 20ms load with Chrome

This data captured with a custom tool shows Chrome's behaviour when continuously drawing frames with a ~20ms load. The red line represents the time between consecutive rAF callbacks and the blue line represents the time elapsed between calling rAF and receiving a callback.

Note how the red line is ping-ponging between 16.67ms and 33.33ms (more or less), representing the cadence of displayed frames on this 60Hz display.

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