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Auto merge of #8300 - pcwalton:avoid-animation-state-flooding, r=glennw

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layout: Avoid flooding the compositor with animation state changes if there are no animations running and no new animations were added.

Avoids compositor jank during scroll.

r? @glennw

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This commit is contained in:
bors-servo 2015-11-03 18:25:33 +05:30
commit 27fb2ed26d
1 changed files with 6 additions and 0 deletions
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6
components/layout/animation.rs
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@ -58,6 +58,12 @@ pub fn update_animation_state(rw_data: &mut LayoutTaskData, pipeline_id: Pipelin
let mut running_animations_hash = (*rw_data.running_animations).clone();
if running_animations_hash.is_empty() && new_running_animations.is_empty() {
// Nothing to do. Return early so we don't flood the compositor with
// `ChangeRunningAnimationsState` messages.
return
}
// Expire old running animations.
let now = clock_ticks::precise_time_s();
let mut keys_to_remove = Vec::new();