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John Recke45b1fd2014-04-15 09:50:16 -07001/*
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 */
John Reck315c3292014-05-09 19:21:04 -070016
John Recke45b1fd2014-04-15 09:50:16 -070017#include "Interpolator.h"
18
John Reck315c3292014-05-09 19:21:04 -070019#include "utils/MathUtils.h"
John Recke45b1fd2014-04-15 09:50:16 -070020
Chris Craik9db58c02015-08-19 15:19:18 -070021#include <algorithm>
22#include <cutils/log.h>
23
John Recke45b1fd2014-04-15 09:50:16 -070024namespace android {
25namespace uirenderer {
26
27Interpolator* Interpolator::createDefaultInterpolator() {
28 return new AccelerateDecelerateInterpolator();
29}
30
31float AccelerateDecelerateInterpolator::interpolate(float input) {
32 return (float)(cosf((input + 1) * M_PI) / 2.0f) + 0.5f;
33}
34
John Reckc8ac7752014-05-12 16:39:41 -070035float AccelerateInterpolator::interpolate(float input) {
36 if (mFactor == 1.0f) {
37 return input * input;
38 } else {
39 return pow(input, mDoubleFactor);
40 }
41}
42
43float AnticipateInterpolator::interpolate(float t) {
44 return t * t * ((mTension + 1) * t - mTension);
45}
46
47static float a(float t, float s) {
48 return t * t * ((s + 1) * t - s);
49}
50
51static float o(float t, float s) {
52 return t * t * ((s + 1) * t + s);
53}
54
55float AnticipateOvershootInterpolator::interpolate(float t) {
56 if (t < 0.5f) return 0.5f * a(t * 2.0f, mTension);
57 else return 0.5f * (o(t * 2.0f - 2.0f, mTension) + 2.0f);
58}
59
60static float bounce(float t) {
61 return t * t * 8.0f;
62}
63
64float BounceInterpolator::interpolate(float t) {
65 t *= 1.1226f;
66 if (t < 0.3535f) return bounce(t);
67 else if (t < 0.7408f) return bounce(t - 0.54719f) + 0.7f;
68 else if (t < 0.9644f) return bounce(t - 0.8526f) + 0.9f;
69 else return bounce(t - 1.0435f) + 0.95f;
70}
71
72float CycleInterpolator::interpolate(float input) {
73 return sinf(2 * mCycles * M_PI * input);
74}
75
76float DecelerateInterpolator::interpolate(float input) {
77 float result;
78 if (mFactor == 1.0f) {
79 result = 1.0f - (1.0f - input) * (1.0f - input);
80 } else {
81 result = 1.0f - pow((1.0f - input), 2 * mFactor);
82 }
83 return result;
84}
85
86float OvershootInterpolator::interpolate(float t) {
87 t -= 1.0f;
88 return t * t * ((mTension + 1) * t + mTension) + 1.0f;
89}
90
Chris Craik51d6a3d2014-12-22 17:16:56 -080091LUTInterpolator::LUTInterpolator(float* values, size_t size)
92 : mValues(values)
93 , mSize(size) {
John Reck315c3292014-05-09 19:21:04 -070094}
95
96LUTInterpolator::~LUTInterpolator() {
John Reck315c3292014-05-09 19:21:04 -070097}
98
99float LUTInterpolator::interpolate(float input) {
100 float lutpos = input * mSize;
101 if (lutpos >= (mSize - 1)) {
102 return mValues[mSize - 1];
103 }
104
105 float ipart, weight;
106 weight = modff(lutpos, &ipart);
107
108 int i1 = (int) ipart;
Chris Craik9db58c02015-08-19 15:19:18 -0700109 int i2 = std::min(i1 + 1, (int) mSize - 1);
John Reck315c3292014-05-09 19:21:04 -0700110
John Reck7aab5a12014-06-20 09:59:56 -0700111 LOG_ALWAYS_FATAL_IF(i1 < 0 || i2 < 0, "negatives in interpolation!"
112 " i1=%d, i2=%d, input=%f, lutpos=%f, size=%zu, values=%p, ipart=%f, weight=%f",
Chris Craik51d6a3d2014-12-22 17:16:56 -0800113 i1, i2, input, lutpos, mSize, mValues.get(), ipart, weight);
John Reck7aab5a12014-06-20 09:59:56 -0700114
John Reck315c3292014-05-09 19:21:04 -0700115 float v1 = mValues[i1];
116 float v2 = mValues[i2];
117
118 return MathUtils::lerp(v1, v2, weight);
119}
120
121
John Recke45b1fd2014-04-15 09:50:16 -0700122} /* namespace uirenderer */
123} /* namespace android */