bool
KeyframeEffectReadonly::HasAnimationOfProperties(
const nsCSSProperty* aProperties,
size_t aPropertyCount) const
{
for (size_t i = 0; i < aPropertyCount; i++) {
if (HasAnimationOfProperty(aProperties[i])) {
return true;
}
}
return false;
}
bool
KeyframeEffectReadOnly::CanThrottle() const
{
// Unthrottle if we are not in effect or current. This will be the case when
// our owning animation has finished, is idle, or when we are in the delay
// phase (but without a backwards fill). In each case the computed progress
// value produced on each tick will be the same so we will skip requesting
// unnecessary restyles in NotifyAnimationTimingUpdated. Any calls we *do* get
// here will be because of a change in state (e.g. we are newly finished or
// newly no longer in effect) in which case we shouldn't throttle the sample.
if (!IsInEffect() || !IsCurrent()) {
return false;
}
nsIFrame* frame = GetAnimationFrame();
if (!frame) {
// There are two possible cases here.
// a) No target element
// b) The target element has no frame, e.g. because it is in a display:none
// subtree.
// In either case we can throttle the animation because there is no
// need to update on the main thread.
return true;
}
// We can throttle the animation if the animation is paint only and
// the target frame is out of view or the document is in background tabs.
if (CanIgnoreIfNotVisible()) {
nsIPresShell* presShell = GetPresShell();
if ((presShell && !presShell->IsActive()) ||
frame->IsScrolledOutOfView()) {
return true;
}
}
// First we need to check layer generation and transform overflow
// prior to the property.mIsRunningOnCompositor check because we should
// occasionally unthrottle these animations even if the animations are
// already running on compositor.
for (const LayerAnimationInfo::Record& record :
LayerAnimationInfo::sRecords) {
// Skip properties that are overridden in the cascade.
// (GetAnimationOfProperty, as called by HasAnimationOfProperty,
// only returns an animation if it currently wins in the cascade.)
if (!HasAnimationOfProperty(record.mProperty)) {
continue;
}
EffectSet* effectSet = EffectSet::GetEffectSet(mTarget->mElement,
mTarget->mPseudoType);
MOZ_ASSERT(effectSet, "CanThrottle should be called on an effect "
"associated with a target element");
layers::Layer* layer =
FrameLayerBuilder::GetDedicatedLayer(frame, record.mLayerType);
// Unthrottle if the layer needs to be brought up to date
if (!layer ||
effectSet->GetAnimationGeneration() !=
layer->GetAnimationGeneration()) {
return false;
}
// If this is a transform animation that affects the overflow region,
// we should unthrottle the animation periodically.
if (record.mProperty == eCSSProperty_transform &&
!CanThrottleTransformChanges(*frame)) {
return false;
}
}
for (const AnimationProperty& property : mProperties) {
if (!property.mIsRunningOnCompositor) {
return false;
}
}
return true;
}
