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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef INTERPOLATOR_H_
     18 #define INTERPOLATOR_H_
     19 
     20 #include <jni.h>
     21 #include <errno.h>
     22 #include <time.h>
     23 #include "JNIHelper.h"
     24 #include "perfMonitor.h"
     25 #include <list>
     26 
     27 namespace ndk_helper
     28 {
     29 
     30 enum INTERPOLATOR_TYPE
     31 {
     32     INTERPOLATOR_TYPE_LINEAR,
     33     INTERPOLATOR_TYPE_EASEINQUAD,
     34     INTERPOLATOR_TYPE_EASEOUTQUAD,
     35     INTERPOLATOR_TYPE_EASEINOUTQUAD,
     36     INTERPOLATOR_TYPE_EASEINCUBIC,
     37     INTERPOLATOR_TYPE_EASEOUTCUBIC,
     38     INTERPOLATOR_TYPE_EASEINOUTCUBIC,
     39     INTERPOLATOR_TYPE_EASEINQUART,
     40     INTERPOLATOR_TYPE_EASEINEXPO,
     41     INTERPOLATOR_TYPE_EASEOUTEXPO,
     42 };
     43 
     44 struct InterpolatorParams
     45 {
     46     float dest_value_;
     47     INTERPOLATOR_TYPE type_;
     48     double duration_;
     49 };
     50 
     51 /******************************************************************
     52  * Interpolates values with several interpolation methods
     53  */
     54 class Interpolator
     55 {
     56 private:
     57     double start_time_;
     58     double dest_time_;
     59     INTERPOLATOR_TYPE type_;
     60 
     61     float start_value_;
     62     float dest_value_;
     63     std::list<InterpolatorParams> list_params_;
     64 
     65     float GetFormula( const INTERPOLATOR_TYPE type,
     66             const float t,
     67             const float b,
     68             const float d,
     69             const float c );
     70 public:
     71     Interpolator();
     72     ~Interpolator();
     73 
     74     Interpolator& Set( const float start,
     75             const float dest,
     76             const INTERPOLATOR_TYPE type,
     77             double duration );
     78 
     79     Interpolator& Add( const float dest,
     80             const INTERPOLATOR_TYPE type,
     81             const double duration );
     82 
     83     bool Update( const double currentTime, float& p );
     84 
     85     void Clear();
     86 };
     87 
     88 }   //namespace ndkHelper
     89 #endif /* INTERPOLATOR_H_ */
     90