Isolation of subtrees of stacking contexts and out-of-flow positioned objects

third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.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 TransformPaintPropertyNode_h
 #define TransformPaintPropertyNode_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint3D.h"
+#include "platform/graphics/paint/PaintPropertyNode.h"
 #include "platform/transforms/TransformationMatrix.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
 
 #include <iosfwd>
 
 namespace blink {
 
 // A transform created by a css property such as "transform" or "perspective"
 // along with a reference to the parent TransformPaintPropertyNode, or nullptr
 // for the root.
-class PLATFORM_EXPORT TransformPaintPropertyNode : public RefCounted<TransformPaintPropertyNode> {
+class PLATFORM_EXPORT TransformPaintPropertyNode : public PaintPropertyNode<TransformPaintPropertyNode> {
 public:
     struct Value {
         Value() { }
         Value(const TransformationMatrix& matrix, const FloatPoint3D& origin) : matrix(matrix), origin(origin) { }
         bool operator ==(const Value& other) const { return matrix == other.matrix && origin == other.origin; }
 
         TransformationMatrix matrix;
         FloatPoint3D origin;
     };
 
     static PassRefPtr<TransformPaintPropertyNode> create(const TransformationMatrix& matrix, const FloatPoint3D& origin, PassRefPtr<TransformPaintPropertyNode> parent = nullptr)
     {
         return adoptRef(new TransformPaintPropertyNode(Value(matrix, origin), parent));
     }
 
     // This form is required by PaintPropertyTreeBuilder::updateObjectPaintProperties().
     static PassRefPtr<TransformPaintPropertyNode> create(const Value& value, PassRefPtr<TransformPaintPropertyNode> parent)
     {
         return adoptRef(new TransformPaintPropertyNode(value, parent));
     }
 
     const Value& value() const { return m_value; }
     const TransformationMatrix& matrix() const { return m_value.matrix; }
     const FloatPoint3D& origin() const { return m_value.origin; }
 
-    // Parent transform that this transform is relative to, or nullptr if this
-    // is the root transform.
-    TransformPaintPropertyNode* parent() const { return m_parent.get(); }
-
-    // Moves this node and its subtrees under another parent.
-    void setParent(PassRefPtr<TransformPaintPropertyNode> parent) { m_parent = parent; }
-
 private:
     TransformPaintPropertyNode(const Value& value, PassRefPtr<TransformPaintPropertyNode> parent)
-        : m_value(value), m_parent(parent) { }
+        : PaintPropertyNode(parent), m_value(value) { }
 
     Value m_value;
-    RefPtr<TransformPaintPropertyNode> m_parent;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const TransformPaintPropertyNode&, std::ostream*);
 
 } // namespace blink
 
 #endif // TransformPaintPropertyNode_h