From a401a0f8fe9901487bc5df611f207cc265d1cec3 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 18 Aug 2021 11:44:05 +0200
Subject: [PATCH] LibWeb: Add fast_is<Layout::InitialContainingBlockBox>

This is used by Layout::Node::containing_block() which is fairly hot.
---
 Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h | 5 +++++
 Userland/Libraries/LibWeb/Layout/Node.h                      | 1 +
 2 files changed, 6 insertions(+)

diff --git a/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h b/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h
index e32d283da4a..a85637f4805 100644
--- a/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h
+++ b/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.h
@@ -31,7 +31,12 @@ public:
     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
index 0dc6edeb7dc..3f0f27a1e60 100644
--- a/Userland/Libraries/LibWeb/Layout/Node.h
+++ b/Userland/Libraries/LibWeb/Layout/Node.h
@@ -100,6 +100,7 @@ public:
     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;