Optimize the pre-paint tree walk and ClipRects

third_party/WebKit/Source/core/paint/ClipRects.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 #ifndef ClipRects_h
 #define ClipRects_h
 
 #include "core/paint/ClipRect.h"
-#include "wtf/RefCounted.h"
 
 namespace blink {
 
-class ClipRects : public RefCounted<ClipRects> {
+class ClipRects {
   USING_FAST_MALLOC(ClipRects);
 
  public:
-  static PassRefPtr<ClipRects> create() { return adoptRef(new ClipRects); }
-  static PassRefPtr<ClipRects> create(const ClipRects& other) {
-    return adoptRef(new ClipRects(other));
-  }
-
   ClipRects() : m_fixed(0) {}
+  ClipRects(const LayoutRect& r)
+      : m_overflowClipRect(r),
+        m_fixedClipRect(r),
+        m_posClipRect(r),
+        m_fixed(0) {}
+  ClipRects(const ClipRects& other)
+      : m_overflowClipRect(other.overflowClipRect()),
+        m_fixedClipRect(other.fixedClipRect()),
+        m_posClipRect(other.posClipRect()),
+        m_fixed(other.fixed()) {}
 
   void reset(const LayoutRect& r) {
     m_overflowClipRect = r;
     m_fixedClipRect = r;
     m_posClipRect = r;
     m_fixed = 0;
   }
 
   const ClipRect& overflowClipRect() const { return m_overflowClipRect; }
   void setOverflowClipRect(const ClipRect& r) { m_overflowClipRect = r; }
@@ skipping 17 matching lines @@
 
   ClipRects& operator=(const ClipRects& other) {
     m_overflowClipRect = other.overflowClipRect();
     m_fixedClipRect = other.fixedClipRect();
     m_posClipRect = other.posClipRect();
     m_fixed = other.fixed();
     return *this;
   }
 
  private:
-  ClipRects(const LayoutRect& r)
-      : m_overflowClipRect(r),
-        m_fixedClipRect(r),
-        m_posClipRect(r),
-        m_fixed(0) {}
-
-  ClipRects(const ClipRects& other)
-      : m_overflowClipRect(other.overflowClipRect()),
-        m_fixedClipRect(other.fixedClipRect()),
-        m_posClipRect(other.posClipRect()),
-        m_fixed(other.fixed()) {}
-
   ClipRect m_overflowClipRect;
   ClipRect m_fixedClipRect;
   ClipRect m_posClipRect;
   unsigned m_fixed;
 };
 
 }  // namespace blink
 
 #endif  // ClipRects_h