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style: Do not re-expire animations.

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If we're restyling a page with animations and layout takes too long, we
might still have the expired animations from the last restyle, without these
being cleared out by layout on `tick_animations`.

Unfortunately it's hard (near to impossible?) to make a reduced test case for
this, since it heavily depends on the speed of the build and conditions that
only happen under heavy loads.

Mainly, it depends on how accurately the `TickAllAnimations` message is sent
from the constellation.

Thus, we can't just re-expire an animation, and we should re-check for it as a
previous animation.

Fixes #12171
This commit is contained in:
Emilio Cobos Álvarez 2016-07-02 14:29:18 -07:00
parent 194fb3e199
commit 62345ae14d
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GPG key ID: 056B727BB9C1027C
2 changed files with 18 additions and 5 deletions
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4
components/style/animation.rs
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@ -83,6 +83,7 @@ impl<Impl: SelectorImplExt> KeyframesAnimationState<Impl> {
/// Returns true if the animation should keep running.
pub fn tick(&mut self) -> bool {
debug!("KeyframesAnimationState::tick");
debug_assert!(!self.expired);
self.started_at += self.duration + self.delay;
match self.running_state {
@ -495,9 +496,9 @@ pub fn update_style_for_animation<Damage, Impl>(context: &SharedStyleContext<Imp
where Impl: SelectorImplExt,
Damage: TRestyleDamage<ConcreteComputedValues = Impl::ComputedValues> {
debug!("update_style_for_animation: entering");
debug_assert!(!animation.is_expired());
match *animation {
Animation::Transition(_, start_time, ref frame, expired) => {
debug_assert!(!expired);
debug!("update_style_for_animation: transition found");
let now = time::precise_time_s();
let mut new_style = (*style).clone();
@ -513,7 +514,6 @@ where Impl: SelectorImplExt,
}
}
Animation::Keyframes(_, ref name, ref state) => {
debug_assert!(!state.expired);
debug!("update_style_for_animation: animation found: \"{}\", {:?}", name, state);
let duration = state.duration;
let started_at = state.started_at;