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/*
* Copyright (C) 2014 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.
*/
#define LOG_TAG "Interpolator"
#include "Interpolator.h"
#include <math.h>
#include <cutils/log.h>
#include "utils/MathUtils.h"
namespace android {
namespace uirenderer {
Interpolator* Interpolator::createDefaultInterpolator() {
return new AccelerateDecelerateInterpolator();
}
float AccelerateDecelerateInterpolator::interpolate(float input) {
return (float)(cosf((input + 1) * M_PI) / 2.0f) + 0.5f;
}
LUTInterpolator::LUTInterpolator(float* values, size_t size) {
mValues = values;
mSize = size;
}
LUTInterpolator::~LUTInterpolator() {
delete mValues;
mValues = 0;
}
float LUTInterpolator::interpolate(float input) {
float lutpos = input * mSize;
if (lutpos >= (mSize - 1)) {
return mValues[mSize - 1];
}
float ipart, weight;
weight = modff(lutpos, &ipart);
int i1 = (int) ipart;
int i2 = MathUtils::min(i1 + 1, mSize - 1);
float v1 = mValues[i1];
float v2 = mValues[i2];
return MathUtils::lerp(v1, v2, weight);
}
} /* namespace uirenderer */
} /* namespace android */
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