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LibWeb: Don't compute full style for ::before/::after unless matched

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Before this patch, we would build full computed style for these pseudo
elements, for every DOM element, even if no ::before/::after selector
actually matched.

This was a colossal waste of time, and we can also just not do that.
Instead, just abort pseudo element style resolution early if no relevant
selectors matched. :^)
This commit is contained in:
Andreas Kling 2023-03-14 16:36:20 +01:00
parent a58d84407f
commit 3e970540b4
3 changed files with 36 additions and 5 deletions
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10
Userland/Libraries/LibWeb/CSS/StyleComputer.h
View file

@ -56,7 +56,9 @@ public:
DOM::Document const& document() const { return m_document; }
NonnullRefPtr<StyleProperties> create_document_style() const;
ErrorOr<NonnullRefPtr<StyleProperties>> compute_style(DOM::Element&, Optional<CSS::Selector::PseudoElement> = {}) const;
ErrorOr<RefPtr<StyleProperties>> compute_pseudo_element_style_if_needed(DOM::Element&, Optional<CSS::Selector::PseudoElement>) const;
// https://www.w3.org/TR/css-cascade/#origin
enum class CascadeOrigin {
@ -78,7 +80,13 @@ public:
void load_fonts_from_sheet(CSSStyleSheet const&);
private:
ErrorOr<void> compute_cascaded_values(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement>) const;
enum class ComputeStyleMode {
Normal,
CreatePseudoElementStyleIfNeeded,
};
ErrorOr<RefPtr<StyleProperties>> compute_style_impl(DOM::Element&, Optional<CSS::Selector::PseudoElement>, ComputeStyleMode) const;
ErrorOr<void> compute_cascaded_values(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement>, bool& did_match_any_pseudo_element_rules) const;
void compute_font(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
void compute_defaulted_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
void absolutize_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;