Bug 211431 – [Win] Implement DisplayRefreshMonitor by using RunLoop::Timer

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Pavel Feldman]

Creating a simple CSS animation fires random rafs every 2-20ms. In some of these rafs animated element is not moving. See console for the following snippet:

<style>button { transition: margin 500ms linear 0s; margin-left: 0; }</style>
<button id=button>Hello</button>

<script>
requestAnimationFrame(foo);
let lastFrame = performance.now();
function foo(time) {
  console.log(time - lastFrame);
  lastFrame = time;
  console.log(button.getBoundingClientRect().x);
  if (button.getBoundingClientRect().x < 100)
    requestAnimationFrame(foo);
}
setTimeout(() => {
  button.style.marginLeft = "100px";
});
</script>

[Fujii Hironori]

Created attachment 398686 [details]
Patch

[Fujii Hironori]

Created attachment 398690 [details]
Patch

[Don Olmstead]

Comment on attachment 398690 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=398690&action=review

r=me

> Source/WTF/wtf/PlatformUse.h:190
>  #define USE_REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR 1

There going to be a followup that removes references to this USE statement?

[Fujii Hironori]

Comment on attachment 398690 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=398690&action=review

>> Source/WTF/wtf/PlatformUse.h:190
>>  #define USE_REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR 1
> 
> There going to be a followup that removes references to this USE statement?

Yup.

[Fujii Hironori]

Comment on attachment 398690 [details]
Patch

Clearing flags on attachment: 398690

Committed r261264: <https://trac.webkit.org/changeset/261264>

[Fujii Hironori]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/62959022>