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diff --git a/ndk/sources/android/helper/interpolator.h b/ndk/sources/android/helper/interpolator.h
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+++ b/ndk/sources/android/helper/interpolator.h
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+/*
+ * Copyright 2013 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 INTERPOLATOR_H_
+#define INTERPOLATOR_H_
+
+#include <jni.h>
+#include <errno.h>
+#include <time.h>
+#include "JNIHelper.h"
+#include "perfMonitor.h"
+#include <list>
+
+enum INTERPOLATOR_TYPE
+{
+    INTERPOLATOR_TYPE_LINEAR,
+    INTERPOLATOR_TYPE_EASEINQUAD,
+    INTERPOLATOR_TYPE_EASEOUTQUAD,
+    INTERPOLATOR_TYPE_EASEINOUTQUAD,
+    INTERPOLATOR_TYPE_EASEINCUBIC,
+    INTERPOLATOR_TYPE_EASEOUTCUBIC,
+    INTERPOLATOR_TYPE_EASEINOUTCUBIC,
+    INTERPOLATOR_TYPE_EASEINQUART,
+    INTERPOLATOR_TYPE_EASEINEXPO,
+    INTERPOLATOR_TYPE_EASEOUTEXPO,
+};
+
+struct interpolatorParam {
+    float fDestValue;
+    INTERPOLATOR_TYPE type;
+    double dDuration;
+};
+
+/******************************************************************
+ * Interpolates values with several interpolation methods
+ */
+class interpolator {
+private:
+    double _dStartTime;
+    double _dDestTime;
+    INTERPOLATOR_TYPE _type;
+
+    float    _fStartValue;
+    float    _fDestValue;
+    std::list< interpolatorParam > m_listParams;
+
+    float   getFormula(INTERPOLATOR_TYPE type, float t, float b, float d, float c);
+public:
+    interpolator();
+    ~interpolator();
+
+    interpolator& set(const float start,
+            const float dest,
+            INTERPOLATOR_TYPE type, double duration);
+
+    interpolator& add(const float dest,
+            INTERPOLATOR_TYPE type, double duration);
+
+    bool update( const double currentTime, float& p );
+
+    void clear();
+};
+
+
+#endif /* INTERPOLATOR_H_ */