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LibWeb: Optimize inherited style update caused by animation

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It is possible to skip inherited style recalculation for children if
parent's recalculation does not cause any changes.

Improves performance on Github where we could avoid dozens of inherited
style calculations that do not produce any visible changes.
This commit is contained in:
Aliaksandr Kalenik 2025-01-05 00:29:13 +03:00 • committed by Andreas Kling
commit 8fdfadb0c9
Notes: github-actions[bot] 2025-01-05 10:31:56 +00:00
1 changed files with 4 additions and 1 deletions
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5
Libraries/LibWeb/Animations/KeyframeEffect.cpp
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@ -939,7 +939,10 @@ void KeyframeEffect::update_computed_properties()
// Traversal of the subtree is necessary to update the animated properties inherited from the target element.
target->for_each_in_subtree_of_type<DOM::Element>([&](auto& element) {
invalidation |= element.recompute_inherited_style();
auto element_invalidation = element.recompute_inherited_style();
if (element_invalidation.is_none())
return TraversalDecision::SkipChildrenAndContinue;
invalidation |= element_invalidation;
return TraversalDecision::Continue;
});