Bug 83499 – [BlackBerry] requestAnimationFrame performance choppy & inconsistent

• Component: WebKit BlackBerry
• Status: RESOLVED FIXED

[Andrew Lo]

Reproduction:
1. http://webstuff.nfshost.com/anim-timing/raftime.html
2. Slide delay slider to the right to add delay to each frame.

Notice that when moving the slider slightly, performance becomes extremely
choppy. Much choppier than it should be given the reported FPS. Also much
choppier than it should be given the delay.

When you slide the delay slider, it should get choppier since you are lowering
frame rate. However, the choppiness should be consistent, meaning the same time
interval between frames. The bug is that it is inconsistent and stutters.

When this is performing correctly, it should transition smoothly to being more
choppy as you move the slider to the right. The FPS should reflect the amount
of choppiness you see, and the choppiness should be consistent.

[Andrew Lo]

Created attachment 136292 [details]
Patch

[Rob Buis]

Comment on attachment 136292 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=136292&action=review

Looks good, but fix ChangeLog first please :)

> Source/WebCore/ChangeLog:10
> +        Reviewed by NOBODY (OOPS!).

The reviewed by line should go between bug/title and explanation.

[Andrew Lo]

Created attachment 136296 [details]
Patch

[Rob Buis]

Comment on attachment 136296 [details]
Patch

Looks good.

[WebKit Review Bot]

Comment on attachment 136296 [details]
Patch

Clearing flags on attachment: 136296

Committed r113644: <http://trac.webkit.org/changeset/113644>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.