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      1 /*
      2  * Copyright (C) 2014 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 #ifndef INTERPOLATOR_H
     17 #define INTERPOLATOR_H
     18 
     19 #include <stddef.h>
     20 #include <memory>
     21 
     22 #include <cutils/compiler.h>
     23 #include <vector>
     24 
     25 namespace android {
     26 namespace uirenderer {
     27 
     28 class Interpolator {
     29 public:
     30     virtual ~Interpolator() {}
     31 
     32     virtual float interpolate(float input) = 0;
     33 
     34     static Interpolator* createDefaultInterpolator();
     35 
     36 protected:
     37     Interpolator() {}
     38 };
     39 
     40 class ANDROID_API AccelerateDecelerateInterpolator : public Interpolator {
     41 public:
     42     virtual float interpolate(float input) override;
     43 };
     44 
     45 class ANDROID_API AccelerateInterpolator : public Interpolator {
     46 public:
     47     explicit AccelerateInterpolator(float factor) : mFactor(factor), mDoubleFactor(factor * 2) {}
     48     virtual float interpolate(float input) override;
     49 
     50 private:
     51     const float mFactor;
     52     const float mDoubleFactor;
     53 };
     54 
     55 class ANDROID_API AnticipateInterpolator : public Interpolator {
     56 public:
     57     explicit AnticipateInterpolator(float tension) : mTension(tension) {}
     58     virtual float interpolate(float input) override;
     59 
     60 private:
     61     const float mTension;
     62 };
     63 
     64 class ANDROID_API AnticipateOvershootInterpolator : public Interpolator {
     65 public:
     66     explicit AnticipateOvershootInterpolator(float tension) : mTension(tension) {}
     67     virtual float interpolate(float input) override;
     68 
     69 private:
     70     const float mTension;
     71 };
     72 
     73 class ANDROID_API BounceInterpolator : public Interpolator {
     74 public:
     75     virtual float interpolate(float input) override;
     76 };
     77 
     78 class ANDROID_API CycleInterpolator : public Interpolator {
     79 public:
     80     explicit CycleInterpolator(float cycles) : mCycles(cycles) {}
     81     virtual float interpolate(float input) override;
     82 
     83 private:
     84     const float mCycles;
     85 };
     86 
     87 class ANDROID_API DecelerateInterpolator : public Interpolator {
     88 public:
     89     explicit DecelerateInterpolator(float factor) : mFactor(factor) {}
     90     virtual float interpolate(float input) override;
     91 
     92 private:
     93     const float mFactor;
     94 };
     95 
     96 class ANDROID_API LinearInterpolator : public Interpolator {
     97 public:
     98     virtual float interpolate(float input) override { return input; }
     99 };
    100 
    101 class ANDROID_API OvershootInterpolator : public Interpolator {
    102 public:
    103     explicit OvershootInterpolator(float tension) : mTension(tension) {}
    104     virtual float interpolate(float input) override;
    105 
    106 private:
    107     const float mTension;
    108 };
    109 
    110 class ANDROID_API PathInterpolator : public Interpolator {
    111 public:
    112     explicit PathInterpolator(std::vector<float>&& x, std::vector<float>&& y) : mX(x), mY(y) {}
    113     virtual float interpolate(float input) override;
    114 
    115 private:
    116     std::vector<float> mX;
    117     std::vector<float> mY;
    118 };
    119 
    120 class ANDROID_API LUTInterpolator : public Interpolator {
    121 public:
    122     LUTInterpolator(float* values, size_t size);
    123     ~LUTInterpolator();
    124 
    125     virtual float interpolate(float input) override;
    126 
    127 private:
    128     std::unique_ptr<float[]> mValues;
    129     size_t mSize;
    130 };
    131 
    132 } /* namespace uirenderer */
    133 } /* namespace android */
    134 
    135 #endif /* INTERPOLATOR_H */
    136