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LibWeb: Cache the used CSS 'position' value on LayoutNodeWithStyle
This avoids having to query the StyleProperties hash map whenever we need to know if an element is absolutely positioned. This was extremely hot in interactive window resize profiles.
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4 changed files with 27 additions and 12 deletions
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@ -190,6 +190,7 @@ public:
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virtual LayoutNode& inline_wrapper() { return *this; }
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const StyleProperties& style() const;
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CSS::Position position() const;
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LayoutNodeWithStyle* parent();
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const LayoutNodeWithStyle* parent() const;
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@ -257,16 +258,14 @@ public:
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const StyleProperties& style() const { return m_style; }
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void set_style(const StyleProperties& style) { m_style = style; }
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CSS::Position position() const { return m_position; }
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protected:
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explicit LayoutNodeWithStyle(const Node* node, NonnullRefPtr<StyleProperties> style)
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: LayoutNode(node)
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, m_style(move(style))
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{
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m_has_style = true;
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}
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explicit LayoutNodeWithStyle(const Node*, NonnullRefPtr<StyleProperties>);
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private:
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NonnullRefPtr<StyleProperties> m_style;
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CSS::Position m_position;
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};
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class LayoutNodeWithStyleAndBoxModelMetrics : public LayoutNodeWithStyle {
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@ -291,6 +290,13 @@ inline const StyleProperties& LayoutNode::style() const
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return parent()->style();
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}
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inline CSS::Position LayoutNode::position() const
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{
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if (m_has_style)
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return static_cast<const LayoutNodeWithStyle*>(this)->position();
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return parent()->position();
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}
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inline const LayoutNodeWithStyle* LayoutNode::parent() const
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{
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return static_cast<const LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
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