Bug 25476 – REGRESSION (r42987): Welcome to Safari 4 animation is jittery

• Status: RESOLVED
• Resolution: FIXED
• Component: Images

Animating images in the Welcome to Safari 4 animation jitter. This can be seen especially well with the "Welcome To Safari" text, where the letters appear to be bouncing up and down throughout the slow scale down effect.

I have confirmed that the regression was caused by <http://trac.webkit.org/changeset/42987> (for bug 25458).

<rdar://problem/6841919>

[David Kilzer (:ddkilzer)]

It may be best just to back this out for now since it's a simple one-line change, unless there is a way to disable this specifically during animations.

[Simon Fraser (smfr)]

The image code doesn't know that an animation is happening, so doing that would  be hard.

The real problem here is that you're rounding after a CSS transform has been applied (and the transform is being animated). Is there a way we can round only when we know that we're not inside a CSS transform?

I think the change shoujld be backed for for now.

Created attachment 29914 [details]
Revert r42897

Fixed in <http://trac.webkit.org/changeset/43062>.

[David Carson]

The original proposal for https://bugs.webkit.org/show_bug.cgi?id=25458 was to wrap it in #ifdef. I will propose a new patch that contains that contains that change.