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LibWeb: Reduce HashMap thrashing during custom property cascade

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Build the final custom property map right away instead of first making
a temporary pointer-only map. We also precompute the final needed
capacity for the map to avoid incremental rehashing.
This commit is contained in:
Andreas Kling 2022-03-03 13:40:06 +01:00
parent e4fdb40158
commit 205208db11
3 changed files with 23 additions and 25 deletions
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6
Userland/Libraries/LibWeb/CSS/StyleComputer.h
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@ -78,8 +78,8 @@ private:
void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID, Optional<CSS::Selector::PseudoElement>) const;
RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, PropertyID, UnresolvedStyleValue const&, HashMap<FlyString, StyleProperty const*> const&) const;
bool expand_unresolved_values(DOM::Element&, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Vector<StyleComponentValueRule> const& source, Vector<StyleComponentValueRule>& dest, size_t source_start_index, HashMap<FlyString, StyleProperty const*> const& custom_properties) const;
RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, PropertyID, UnresolvedStyleValue const&, HashMap<FlyString, StyleProperty> const&) const;
bool expand_unresolved_values(DOM::Element&, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Vector<StyleComponentValueRule> const& source, Vector<StyleComponentValueRule>& dest, size_t source_start_index, HashMap<FlyString, StyleProperty> const& custom_properties) const;
template<typename Callback>
void for_each_stylesheet(CascadeOrigin, Callback) const;
@ -89,7 +89,7 @@ private:
Vector<MatchingRule> author_rules;
};
void cascade_declarations(StyleProperties&, DOM::Element&, Vector<MatchingRule> const&, CascadeOrigin, Important important, HashMap<FlyString, StyleProperty const*> const&) const;
void cascade_declarations(StyleProperties&, DOM::Element&, Vector<MatchingRule> const&, CascadeOrigin, Important important, HashMap<FlyString, StyleProperty> const&) const;
void build_rule_cache();
void build_rule_cache_if_needed() const;