(WIP) Paint property hierarchy approach 1 of 2

third_party/WebKit/Source/platform/graphics/paint/TransformPaintProperty.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 TransformPaintProperty_h
+#define TransformPaintProperty_h
+
+#include "platform/PlatformExport.h"
+#include "platform/geometry/FloatPoint3D.h"
+#include "platform/transforms/TransformationMatrix.h"
+
+#include <iosfwd>
+
+namespace blink {
+
+// A transform created by a css property such as "transform" or "perspective"
+// along with an index for the parent transform property that this transform is
+// relative to (or 0 for the root transform).
+class PLATFORM_EXPORT TransformPaintProperty {
+public:
+    TransformPaintProperty(const TransformationMatrix& matrix, const FloatPoint3D& origin, size_t parentIndex)
+        : m_matrix(matrix), m_origin(origin), m_parentIndex(parentIndex) { };
+
+    const TransformationMatrix& matrix() const { return m_matrix; }
+    const FloatPoint3D& origin() const { return m_origin; }
+
+    // Parent index in the Vector that owns transform paint properties.
+    size_t parentIndex() const { return m_parentIndex; }
+
+private:
+    const TransformationMatrix m_matrix;
+    const FloatPoint3D m_origin;
+    const size_t m_parentIndex;
+};
+
+// Redeclared here to avoid ODR issues.
+// See platform/testing/PaintPrinters.h.
+void PrintTo(const TransformPaintProperty&, std::ostream*);
+
+} // namespace blink
+
+#endif // TransformPaintProperty_h