124 lines
3.2 KiB
C++
124 lines
3.2 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Interpolator.h"
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#include "utils/MathUtils.h"
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#include <algorithm>
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#include <cutils/log.h>
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namespace android {
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namespace uirenderer {
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Interpolator* Interpolator::createDefaultInterpolator() {
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return new AccelerateDecelerateInterpolator();
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}
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float AccelerateDecelerateInterpolator::interpolate(float input) {
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return (float)(cosf((input + 1) * M_PI) / 2.0f) + 0.5f;
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}
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float AccelerateInterpolator::interpolate(float input) {
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if (mFactor == 1.0f) {
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return input * input;
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} else {
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return pow(input, mDoubleFactor);
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}
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}
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float AnticipateInterpolator::interpolate(float t) {
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return t * t * ((mTension + 1) * t - mTension);
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}
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static float a(float t, float s) {
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return t * t * ((s + 1) * t - s);
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}
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static float o(float t, float s) {
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return t * t * ((s + 1) * t + s);
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}
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float AnticipateOvershootInterpolator::interpolate(float t) {
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if (t < 0.5f) return 0.5f * a(t * 2.0f, mTension);
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else return 0.5f * (o(t * 2.0f - 2.0f, mTension) + 2.0f);
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}
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static float bounce(float t) {
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return t * t * 8.0f;
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}
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float BounceInterpolator::interpolate(float t) {
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t *= 1.1226f;
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if (t < 0.3535f) return bounce(t);
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else if (t < 0.7408f) return bounce(t - 0.54719f) + 0.7f;
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else if (t < 0.9644f) return bounce(t - 0.8526f) + 0.9f;
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else return bounce(t - 1.0435f) + 0.95f;
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}
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float CycleInterpolator::interpolate(float input) {
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return sinf(2 * mCycles * M_PI * input);
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}
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float DecelerateInterpolator::interpolate(float input) {
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float result;
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if (mFactor == 1.0f) {
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result = 1.0f - (1.0f - input) * (1.0f - input);
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} else {
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result = 1.0f - pow((1.0f - input), 2 * mFactor);
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}
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return result;
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}
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float OvershootInterpolator::interpolate(float t) {
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t -= 1.0f;
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return t * t * ((mTension + 1) * t + mTension) + 1.0f;
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}
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LUTInterpolator::LUTInterpolator(float* values, size_t size)
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: mValues(values)
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, mSize(size) {
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}
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LUTInterpolator::~LUTInterpolator() {
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}
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float LUTInterpolator::interpolate(float input) {
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float lutpos = input * mSize;
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if (lutpos >= (mSize - 1)) {
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return mValues[mSize - 1];
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}
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float ipart, weight;
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weight = modff(lutpos, &ipart);
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int i1 = (int) ipart;
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int i2 = std::min(i1 + 1, (int) mSize - 1);
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LOG_ALWAYS_FATAL_IF(i1 < 0 || i2 < 0, "negatives in interpolation!"
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" i1=%d, i2=%d, input=%f, lutpos=%f, size=%zu, values=%p, ipart=%f, weight=%f",
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i1, i2, input, lutpos, mSize, mValues.get(), ipart, weight);
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float v1 = mValues[i1];
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float v2 = mValues[i2];
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return MathUtils::lerp(v1, v2, weight);
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}
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} /* namespace uirenderer */
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} /* namespace android */
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