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LibWeb: Improve performance of CSS custom property resolution

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By memoizing already resolved custom properties in the DOM::Element,
we achieve a notable speed increase when loading SerenityOS on GitHub.
This commit is contained in:
Tobias Christiansen 2021-05-28 21:21:44 +02:00 • committed by Ali Mohammad Pur
parent 3ede1d08f5
commit 301eb998c6
3 changed files with 22 additions and 6 deletions
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10
Userland/Libraries/LibWeb/CSS/StyleResolver.cpp
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@ -765,8 +765,11 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
style.set_property(property_id, value);
}
StyleResolver::CustomPropertyResolutionTuple StyleResolver::resolve_custom_property_with_specificity(const DOM::Element& element, const String& custom_property_name) const
StyleResolver::CustomPropertyResolutionTuple StyleResolver::resolve_custom_property_with_specificity(DOM::Element& element, const String& custom_property_name) const
{
if (auto maybe_property = element.resolve_custom_property(custom_property_name); maybe_property.has_value())
return maybe_property.value();
auto parent_element = element.parent_element();
CustomPropertyResolutionTuple parent_resolved {};
if (parent_element)
@ -782,6 +785,7 @@ StyleResolver::CustomPropertyResolutionTuple StyleResolver::resolve_custom_prope
auto custom_property_style = match.rule->declaration().custom_property(custom_property_name);
if (custom_property_style.has_value()) {
element.add_custom_property(custom_property_name, { custom_property_style.value(), match.specificity });
return { custom_property_style.value(), match.specificity };
}
}
@ -789,14 +793,14 @@ StyleResolver::CustomPropertyResolutionTuple StyleResolver::resolve_custom_prope
return parent_resolved;
}
Optional<StyleProperty> StyleResolver::resolve_custom_property(const DOM::Element& element, const String& custom_property_name) const
Optional<StyleProperty> StyleResolver::resolve_custom_property(DOM::Element& element, const String& custom_property_name) const
{
auto resolved_with_specificity = resolve_custom_property_with_specificity(element, custom_property_name);
return resolved_with_specificity.style;
}
NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const DOM::Element& element) const
NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(DOM::Element& element) const
{
auto style = StyleProperties::create();