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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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4
Userland/Libraries/LibWeb/Layout/TextNode.h
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@ -47,6 +47,7 @@ public:
virtual void split_into_lines(InlineFormattingContext&, LayoutMode) override;
private:
virtual bool is_text_node() const final { return true; }
void split_into_lines_by_rules(InlineFormattingContext&, LayoutMode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks);
void paint_cursor_if_needed(PaintContext&, const LineBoxFragment&) const;
@ -56,4 +57,7 @@ private:
String m_text_for_rendering;
};
template<>
inline bool Node::fast_is<TextNode>() const { return is_text_node(); }
}