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Cache animation computed values when animations change

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Instead of recalculating the animation style every tick of an animation,
cache the computed values when animations change. In addition to being
more efficient, this will allow us to return animation rules as property
declarations because we don't need to consult the final style to produce
them.
This commit is contained in:
Martin Robinson 2020-05-18 16:32:41 +02:00
parent 7df4655b60
commit 83fa1b9eaa
9 changed files with 246 additions and 169 deletions
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45
components/style/matching.rs
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@ -233,7 +233,6 @@ trait PrivateMatchMethods: TElement {
Some(style.0)
}
#[cfg(feature = "gecko")]
fn needs_animations_update(
&self,
context: &mut StyleContext<Self>,
@ -243,7 +242,7 @@ trait PrivateMatchMethods: TElement {
let new_box_style = new_style.get_box();
let new_style_specifies_animations = new_box_style.specifies_animations();
let has_animations = self.has_css_animations();
let has_animations = self.has_css_animations(&context.shared);
if !new_style_specifies_animations && !has_animations {
return false;
}
@ -439,37 +438,53 @@ trait PrivateMatchMethods: TElement {
) {
use crate::animation::AnimationState;
// We need to call this before accessing the `ElementAnimationSet` from the
// map because this call will do a RwLock::read().
let needs_animations_update =
self.needs_animations_update(context, old_values.as_ref().map(|s| &**s), new_values);
let this_opaque = self.as_node().opaque();
let shared_context = context.shared;
let mut animation_states = shared_context.animation_states.write();
let mut animation_state = animation_states.remove(&this_opaque).unwrap_or_default();
let mut animation_set = shared_context
.animation_states
.write()
.remove(&this_opaque)
.unwrap_or_default();
animation_state.update_animations_for_new_style(*self, &shared_context, &new_values);
// Starting animations is expensive, because we have to recalculate the style
// for all the keyframes. We only want to do this if we think that there's a
// chance that the animations really changed.
if needs_animations_update {
animation_set.update_animations_for_new_style::<Self>(
*self,
&shared_context,
&new_values,
&context.thread_local.font_metrics_provider,
);
}
animation_state.update_transitions_for_new_style::<Self>(
animation_set.update_transitions_for_new_style(
&shared_context,
this_opaque,
old_values.as_ref(),
new_values,
&context.thread_local.font_metrics_provider,
);
animation_state.apply_active_animations::<Self>(
shared_context,
new_values,
&context.thread_local.font_metrics_provider,
);
animation_set.apply_active_animations(shared_context, new_values);
// We clear away any finished transitions, but retain animations, because they
// might still be used for proper calculation of `animation-fill-mode`.
animation_state
animation_set
.transitions
.retain(|transition| transition.state != AnimationState::Finished);
// If the ElementAnimationSet is empty, and don't store it in order to
// save memory and to avoid extra processing later.
if !animation_state.is_empty() {
animation_states.insert(this_opaque, animation_state);
if !animation_set.is_empty() {
shared_context
.animation_states
.write()
.insert(this_opaque, animation_set);
}
}