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LibWeb: Use ancestor filters for hover style invalidation

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By using ancestor filters some selectors could be early rejected
skipping selector engine invocation. According to my measurements it's
30-80% hover selectors depending on the website.
This commit is contained in:
Aliaksandr Kalenik 2025-01-28 03:04:04 +01:00 • committed by Alexander Kalenik
commit db47fa3db1
Notes: github-actions[bot] 2025-01-28 17:56:41 +00:00
2 changed files with 30 additions and 20 deletions
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46
Libraries/LibWeb/DOM/Document.cpp
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@ -1667,6 +1667,7 @@ void Document::invalidate_style_for_elements_affected_by_hover_change(Node& old_
auto& root = old_new_hovered_common_ancestor.root();
auto shadow_root = is<ShadowRoot>(root) ? static_cast<ShadowRoot const*>(&root) : nullptr;
auto& style_computer = this->style_computer();
auto compute_hover_selectors_match_state = [&](Element const& element) {
auto state = MUST(AK::Bitmap::create(hover_rules.size(), 0));
for (size_t rule_index = 0; rule_index < hover_rules.size(); ++rule_index) {
@ -1681,6 +1682,8 @@ void Document::invalidate_style_for_elements_affected_by_hover_change(Node& old_
continue;
auto const& selector = rule.selector;
if (style_computer.should_reject_with_ancestor_filter(selector))
continue;
SelectorEngine::MatchContext context;
bool selector_matched = false;
@ -1703,27 +1706,34 @@ void Document::invalidate_style_for_elements_affected_by_hover_change(Node& old_
return state;
};
root.for_each_in_inclusive_subtree([&](Node& node) {
if (!node.is_element())
return TraversalDecision::Continue;
auto& element = static_cast<Element&>(node);
if (!element.affected_by_hover())
return TraversalDecision::Continue;
Function<void(Node&)> invalidate_hovered_elements_recursively = [&](Node& node) -> void {
if (node.is_element()) {
auto& element = static_cast<Element&>(node);
style_computer.push_ancestor(element);
if (element.affected_by_hover()) {
auto selectors_match_state_before = compute_hover_selectors_match_state(element);
TemporaryChange change { m_hovered_node, hovered_node };
auto selectors_match_state_after = compute_hover_selectors_match_state(element);
if (selectors_match_state_before.view() != selectors_match_state_after.view()) {
element.set_needs_style_update(true);
element.for_each_in_subtree_of_type<Element>([](auto& element) {
element.set_needs_inherited_style_update(true);
return TraversalDecision::Continue;
});
}
}
}
auto selectors_match_state_before = compute_hover_selectors_match_state(element);
TemporaryChange change { m_hovered_node, hovered_node };
auto selectors_match_state_after = compute_hover_selectors_match_state(element);
if (selectors_match_state_before.view() == selectors_match_state_after.view())
return TraversalDecision::Continue;
element.set_needs_style_update(true);
element.for_each_in_subtree_of_type<Element>([](auto& element) {
element.set_needs_inherited_style_update(true);
return TraversalDecision::Continue;
node.for_each_child([&](auto& child) {
invalidate_hovered_elements_recursively(child);
return IterationDecision::Continue;
});
return TraversalDecision::Continue;
});
if (node.is_element())
style_computer.pop_ancestor(static_cast<Element&>(node));
};
invalidate_hovered_elements_recursively(root);
}
void Document::set_hovered_node(Node* node)