Improve performance of GeometryMapper cache.

third_party/WebKit/Source/platform/graphics/paint/ClipPaintPropertyNode.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ClipPaintPropertyNode_h
 #define ClipPaintPropertyNode_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRoundedRect.h"
+#include "platform/graphics/paint/GeometryMapperClipCache.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 #include <iosfwd>
 
 namespace blink {
 
+class GeometryMapperClipCache;
+
 // A clip rect created by a css property such as "overflow" or "clip".
 // Along with a reference to the transform space the clip rect is based on,
 // and a parent ClipPaintPropertyNode for inherited clips.
 //
 // The clip tree is rooted at a node with no parent. This root node should
 // not be modified.
 class PLATFORM_EXPORT ClipPaintPropertyNode
     : public RefCounted<ClipPaintPropertyNode> {
  public:
   // This node is really a sentinel, and does not represent a real clip
@@ skipping 60 matching lines @@
   ClipPaintPropertyNode(
       PassRefPtr<const ClipPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> localTransformSpace,
       const FloatRoundedRect& clipRect,
       CompositingReasons directCompositingReasons)
       : m_parent(parent),
         m_localTransformSpace(localTransformSpace),
         m_clipRect(clipRect),
         m_directCompositingReasons(directCompositingReasons) {}
 
+  // For access to getClipCache();
+  friend class GeometryMapper;
+  friend class GeometryMapperTest;
+
+  GeometryMapperClipCache& getClipCache() const {
+    return const_cast<ClipPaintPropertyNode*>(this)->getClipCache();
+  }
+
+  GeometryMapperClipCache& getClipCache() {
+    if (!m_geometryMapperClipCache)
+      m_geometryMapperClipCache.reset(new GeometryMapperClipCache());
+    return *m_geometryMapperClipCache.get();
+  }
+
   RefPtr<const ClipPaintPropertyNode> m_parent;
   RefPtr<const TransformPaintPropertyNode> m_localTransformSpace;
   FloatRoundedRect m_clipRect;
   CompositingReasons m_directCompositingReasons;
+
+  std::unique_ptr<GeometryMapperClipCache> m_geometryMapperClipCache;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const ClipPaintPropertyNode&, std::ostream*);
 
 }  // namespace blink
 
 #endif  // ClipPaintPropertyNode_h