| /* |
| * 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. |
| */ |
| |
| #include "Interpolator.h" |
| |
| #include <algorithm> |
| |
| #include <log/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; |
| } |
| |
| float AccelerateInterpolator::interpolate(float input) { |
| if (mFactor == 1.0f) { |
| return input * input; |
| } else { |
| return pow(input, mDoubleFactor); |
| } |
| } |
| |
| float AnticipateInterpolator::interpolate(float t) { |
| return t * t * ((mTension + 1) * t - mTension); |
| } |
| |
| static float a(float t, float s) { |
| return t * t * ((s + 1) * t - s); |
| } |
| |
| static float o(float t, float s) { |
| return t * t * ((s + 1) * t + s); |
| } |
| |
| float AnticipateOvershootInterpolator::interpolate(float t) { |
| if (t < 0.5f) return 0.5f * a(t * 2.0f, mTension); |
| else return 0.5f * (o(t * 2.0f - 2.0f, mTension) + 2.0f); |
| } |
| |
| static float bounce(float t) { |
| return t * t * 8.0f; |
| } |
| |
| float BounceInterpolator::interpolate(float t) { |
| t *= 1.1226f; |
| if (t < 0.3535f) return bounce(t); |
| else if (t < 0.7408f) return bounce(t - 0.54719f) + 0.7f; |
| else if (t < 0.9644f) return bounce(t - 0.8526f) + 0.9f; |
| else return bounce(t - 1.0435f) + 0.95f; |
| } |
| |
| float CycleInterpolator::interpolate(float input) { |
| return sinf(2 * mCycles * M_PI * input); |
| } |
| |
| float DecelerateInterpolator::interpolate(float input) { |
| float result; |
| if (mFactor == 1.0f) { |
| result = 1.0f - (1.0f - input) * (1.0f - input); |
| } else { |
| result = 1.0f - pow((1.0f - input), 2 * mFactor); |
| } |
| return result; |
| } |
| |
| float OvershootInterpolator::interpolate(float t) { |
| t -= 1.0f; |
| return t * t * ((mTension + 1) * t + mTension) + 1.0f; |
| } |
| |
| LUTInterpolator::LUTInterpolator(float* values, size_t size) |
| : mValues(values) |
| , mSize(size) { |
| } |
| |
| LUTInterpolator::~LUTInterpolator() { |
| } |
| |
| float LUTInterpolator::interpolate(float input) { |
| // lut position should only be at the end of the table when input is 1f. |
| float lutpos = input * (mSize - 1); |
| if (lutpos >= (mSize - 1)) { |
| return mValues[mSize - 1]; |
| } |
| |
| float ipart, weight; |
| weight = modff(lutpos, &ipart); |
| |
| int i1 = (int) ipart; |
| int i2 = std::min(i1 + 1, (int) mSize - 1); |
| |
| LOG_ALWAYS_FATAL_IF(i1 < 0 || i2 < 0, "negatives in interpolation!" |
| " i1=%d, i2=%d, input=%f, lutpos=%f, size=%zu, values=%p, ipart=%f, weight=%f", |
| i1, i2, input, lutpos, mSize, mValues.get(), ipart, weight); |
| |
| float v1 = mValues[i1]; |
| float v2 = mValues[i2]; |
| |
| return MathUtils::lerp(v1, v2, weight); |
| } |
| |
| |
| } /* namespace uirenderer */ |
| } /* namespace android */ |