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LibWeb: Don't make deep copy of custom properties for every element

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Previously we were making a copy of the full set of custom properties
that applied to a DOM element. This was very costly and dominated the
profile when mousing around on GitHub.

Note that this may break custom properties on pseudo elements a little
bit, and that's something we'll have to look into.
This commit is contained in:
Andreas Kling 2022-03-13 17:07:14 +01:00
parent f88d65d9cb
commit 39389b5704
2 changed files with 30 additions and 34 deletions
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6
Userland/Libraries/LibWeb/CSS/StyleComputer.h
View file

@ -80,8 +80,8 @@ 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;
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;
RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, PropertyID, UnresolvedStyleValue 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) const;
template<typename Callback>
void for_each_stylesheet(CascadeOrigin, Callback) const;
@ -91,7 +91,7 @@ private:
Vector<MatchingRule> author_rules;
};
void cascade_declarations(StyleProperties&, DOM::Element&, Vector<MatchingRule> const&, CascadeOrigin, Important important, HashMap<FlyString, StyleProperty> const&) const;
void cascade_declarations(StyleProperties&, DOM::Element&, Vector<MatchingRule> const&, CascadeOrigin, Important important) const;
void build_rule_cache();
void build_rule_cache_if_needed() const;