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Gecko engine for Wine
603a09ba64
EnsureStyleRuleFor contains logic for performing throttled updates to the style rule but it is only used in one case: inside nsTransitionManager::UpdateCascadeResults to determine what properties are being animated by CSS animations. We would like to remove throttling logic from EnsureStyleRuleFor altogether but if that one case where it is currently used is run on every tick then removing this logic could effectively mean we end up updating the style rule on every tick. Fortunately nsTransitionManager::UpdateCascadeResults is only called in the following cases: 1. From nsTransitionManager::StyleContextChanged (via TransitionManager::UpdateCascadeResultsWithTransitions), when we are processing style changes for transitions. 2. From AnimationCollection::EnsureStyleRuleFor (via nsAnimationManager::MaybeUpdateCascadeResults and nsTransitionManager::UpdateCascadeResultsWithAnimations), when we are updating the animation style rule from CSS animations. 3. From nsAnimationManager::CheckAnimationRule (via TransitionManager::UpdateCascadeResultsWithAnimationsToBeDestroyed), when we are processing style changes for CSS animations. None of these things should be happenning on a regular throttle-able tick so by removing this logic we shouldn't be causing any additional work. I have verified, using a test case that combines transitions and animations on the same property, that we have the same behavior with regard to calling EnsureStyleRuleFor both before and after this patch (specifically we avoid calling it altogether while running only the transition but when the animation starts and clobbers the transition we end up calling EnsureStyleRuleFor once on each tick). |
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