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LibWeb: Add CSS rule buckets for pseudo elements, and for :root

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If a selector must match a pseudo element, or must match the root
element, we now cache that information in the MatchingRule struct.
We also introduce separate buckets for these rules, so we can avoid
running them altogether if the current element can't possibly match.

This cuts the number of selectors evaluated by 32% when loading our
GitHub repo page https://github.com/SerenityOS/serenity
This commit is contained in:
Andreas Kling
2024-03-13 11:47:25 +01:00
parent c6e37d0c44
commit bbf67faa95
2 changed files with 30 additions and 6 deletions
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4
Userland/Libraries/LibWeb/CSS/StyleComputer.h
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@@ -37,8 +37,10 @@ struct MatchingRule {
size_t style_sheet_index { 0 };
size_t rule_index { 0 };
size_t selector_index { 0 };
u32 specificity { 0 };
bool contains_pseudo_element { false };
bool contains_root_pseudo_class { false };
};
struct FontFaceKey {
@@ -129,6 +131,8 @@ private:
HashMap<FlyString, Vector<MatchingRule>> rules_by_id;
HashMap<FlyString, Vector<MatchingRule>> rules_by_class;
HashMap<FlyString, Vector<MatchingRule>> rules_by_tag_name;
Vector<MatchingRule> pseudo_element_rules;
Vector<MatchingRule> root_rules;
Vector<MatchingRule> other_rules;
HashMap<FlyString, NonnullRefPtr<Animations::KeyframeEffect::KeyFrameSet>> rules_by_animation_keyframes;