LibWeb: Add fast_is<Layout::InitialContainingBlockBox>

This is used by Layout::Node::containing_block() which is fairly hot.
akimdi · Aug 18, 2021 · a401a0f · a401a0f
1 parent 1268b39
commit a401a0f
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diff --git a/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h b/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h
@@ -31,7 +31,12 @@ class InitialContainingBlockBox final : public BlockBox {
  void recompute_selection_states();
 
 private:
+ virtual bool is_initial_containing_block_box() const override { return true; }
+
  LayoutRange m_selection;
 };
 
+template<>
+inline bool Node::fast_is<InitialContainingBlockBox>() const { return is_initial_containing_block_box(); }
+
 }
diff --git a/Userland/Libraries/LibWeb/Layout/Node.h b/Userland/Libraries/LibWeb/Layout/Node.h
@@ -100,6 +100,7 @@ class Node : public TreeNode<Node> {
  virtual bool is_box() const { return false; }
  virtual bool is_block_box() const { return false; }
  virtual bool is_text_node() const { return false; }
+ virtual bool is_initial_containing_block_box() const { return false; }
 
  template<typename T>
  bool fast_is() const = delete;