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diff --git a/libs/hwui/ClipArea.h b/libs/hwui/ClipArea.h
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+++ b/libs/hwui/ClipArea.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef CLIPAREA_H
+#define CLIPAREA_H
+
+#include <SkRegion.h>
+
+#include "Matrix.h"
+#include "Rect.h"
+#include "utils/Pair.h"
+
+namespace android {
+namespace uirenderer {
+
+Rect transformAndCalculateBounds(const Rect& r, const Matrix4& transform);
+
+class TransformedRectangle {
+public:
+    TransformedRectangle();
+    TransformedRectangle(const Rect& bounds, const Matrix4& transform);
+
+    bool canSimplyIntersectWith(const TransformedRectangle& other) const;
+    bool intersectWith(const TransformedRectangle& other);
+
+    bool isEmpty() const;
+
+    const Rect& getBounds() const {
+        return mBounds;
+    }
+
+    Rect transformedBounds() const {
+        Rect transformedBounds(transformAndCalculateBounds(mBounds, mTransform));
+        return transformedBounds;
+    }
+
+    const Matrix4& getTransform() const {
+        return mTransform;
+    }
+
+private:
+    Rect mBounds;
+    Matrix4 mTransform;
+};
+
+class RectangleList {
+public:
+    RectangleList();
+
+    bool isEmpty() const;
+    int getTransformedRectanglesCount() const;
+    const TransformedRectangle& getTransformedRectangle(int i) const;
+
+    void setEmpty();
+    void set(const Rect& bounds, const Matrix4& transform);
+    bool intersectWith(const Rect& bounds, const Matrix4& transform);
+
+    SkRegion convertToRegion(const SkRegion& clip) const;
+    Rect calculateBounds() const;
+
+private:
+    enum {
+        kMaxTransformedRectangles = 5
+    };
+
+    int mTransformedRectanglesCount;
+    TransformedRectangle mTransformedRectangles[kMaxTransformedRectangles];
+};
+
+class ClipArea {
+public:
+    ClipArea();
+
+    void setViewportDimensions(int width, int height);
+
+    bool isEmpty() const {
+        return mClipRect.isEmpty();
+    }
+
+    void setEmpty();
+    void setClip(float left, float top, float right, float bottom);
+    bool clipRectWithTransform(float left, float top, float right, float bottom,
+            const mat4* transform, SkRegion::Op op = SkRegion::kIntersect_Op);
+    bool clipRectWithTransform(const Rect& r, const mat4* transform,
+            SkRegion::Op op = SkRegion::kIntersect_Op);
+    bool clipRegion(const SkRegion& region, SkRegion::Op op = SkRegion::kIntersect_Op);
+    bool clipPathWithTransform(const SkPath& path, const mat4* transform,
+            SkRegion::Op op);
+
+    const Rect& getClipRect() const {
+        return mClipRect;
+    }
+
+    const SkRegion& getClipRegion() const {
+        return mClipRegion;
+    }
+
+    const RectangleList& getRectangleList() const {
+        return mRectangleList;
+    }
+
+    bool isRegion() const {
+        return kModeRegion == mMode;
+    }
+
+    bool isSimple() const {
+        return mMode == kModeRectangle;
+    }
+
+    bool isRectangleList() const {
+        return mMode == kModeRectangleList;
+    }
+
+private:
+    void enterRectangleMode();
+    bool rectangleModeClipRectWithTransform(const Rect& r, const mat4* transform, SkRegion::Op op);
+    bool rectangleModeClipRectWithTransform(float left, float top, float right,
+            float bottom, const mat4* transform, SkRegion::Op op);
+
+    void enterRectangleListMode();
+    bool rectangleListModeClipRectWithTransform(float left, float top,
+            float right, float bottom, const mat4* transform, SkRegion::Op op);
+    bool rectangleListModeClipRectWithTransform(const Rect& r,
+            const mat4* transform, SkRegion::Op op);
+
+    void enterRegionModeFromRectangleMode();
+    void enterRegionModeFromRectangleListMode();
+    void enterRegionMode();
+    bool regionModeClipRectWithTransform(const Rect& r, const mat4* transform,
+            SkRegion::Op op);
+    bool regionModeClipRectWithTransform(float left, float top, float right,
+            float bottom, const mat4* transform, SkRegion::Op op);
+
+    void ensureClipRegion();
+    void onClipRegionUpdated();
+    bool clipRegionOp(float left, float top, float right, float bottom,
+            SkRegion::Op op);
+
+    SkRegion createViewportRegion() {
+        return SkRegion(mViewportBounds.toSkIRect());
+    }
+
+    void regionFromPath(const SkPath& path, SkRegion& pathAsRegion) {
+        pathAsRegion.setPath(path, createViewportRegion());
+    }
+
+    enum Mode {
+        kModeRectangle,
+        kModeRegion,
+        kModeRectangleList
+    };
+
+    Mode mMode;
+    Rect mViewportBounds;
+    Rect mClipRect;
+    SkRegion mClipRegion;
+    RectangleList mRectangleList;
+};
+
+} /* namespace uirenderer */
+} /* namespace android */
+
+#endif /* CLIPAREA_H_ */