Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: d1bb2bd1b7a474e08ef8fb7c17d209e96c781a6f
https://github.com/WebKit/WebKit/commit/d1bb2bd1b7a474e08ef8fb7c17d209e96c781a6f
Author: Antoine Quint <[email protected]>
Date: 2024-05-06 (Mon, 06 May 2024)
Changed paths:
A
LayoutTests/webanimations/accelerated-animation-removed-permanently-when-forward-filling-expected.txt
A
LayoutTests/webanimations/accelerated-animation-removed-permanently-when-forward-filling.html
M Source/WebCore/animation/KeyframeEffect.cpp
Log Message:
-----------
[view-transitions] https://simple-set-demos.glitch.me/dust-no-raf/ flickers
more as animation is re-ran
https://bugs.webkit.org/show_bug.cgi?id=273649
rdar://127458540
Reviewed by Dean Jackson.
If an effect targeting an accelerated CSS property enters a phase [0] other
than "active", for instance
when it's forward-filling, `KeyframeEffect::updateAcceleratedActions()` will
enqueue a `Stop` accelerated
action for that animation and thus remove its matching accelerated animation on
the next frame.
However, if an element is targeted by multiple animations for the same
accelerated CSS property,
`KeyframeEffect::applyPendingAcceleratedActionsOrUpdateTimingProperties()` will
process an
`UpdateProperties` accelerated action for all effects in the stack to ensure
that they are indeed
running.
In the case of this demo, there are three forward-filling animations applied to
the same element. A
bottom-most one targeting `transform`, then two animations targeting `opacity`.
The first two animations
end early but the third animation runs longer and it is when that animation is
the sole "active" animation
that we enter a state where the two mechanisms described above will
intermittently remove the forward-filling
`opacity` animation and then re-start it in the next frame. This yields the
visible flickering effect.
We now check that an animation is in the "active" phase before restarting it to
ensure it is in the right
state when processing a keyframe effect stack.
[0]
https://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states
*
LayoutTests/webanimations/accelerated-animation-removed-permanently-when-forward-filling-expected.txt:
Added.
*
LayoutTests/webanimations/accelerated-animation-removed-permanently-when-forward-filling.html:
Added.
* Source/WebCore/animation/KeyframeEffect.cpp:
(WebCore::KeyframeEffect::applyPendingAcceleratedActionsOrUpdateTimingProperties):
Canonical link: https://commits.webkit.org/278434@main
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