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LibWeb: Add fast_is<T>() for some DOM and layout node subclasses

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The generic is<T>() uses dynamic_cast which is fine in the majority
of cases, but when one of them shows up in profiles, we can make it
faster by answering the is-a question manually.
This commit is contained in:
Andreas Kling 2021-01-17 09:34:01 +01:00
parent 65fa0c2774
commit fd441b954d
7 changed files with 24 additions and 17 deletions
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6
Userland/Libraries/LibWeb/Layout/Node.h
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@ -115,7 +115,13 @@ public:
virtual void paint_fragment(PaintContext&, const LineBoxFragment&, PaintPhase) const { }
virtual void after_children_paint(PaintContext&, PaintPhase) {};
// These are used to optimize hot is<T> variants for some classes where dynamic_cast is too slow.
virtual bool is_box() const { return false; }
virtual bool is_block_box() const { return false; }
virtual bool is_text_node() const { return false; }
template<typename T>
bool fast_is() const = delete;
bool is_floating() const;
bool is_positioned() const;