PropertyValuesHolder.cpp revision c9493879d7b38b9d0b5b09aa3760966a3ca33eac 
1/*
2 * Copyright (C) 2016 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
17#include "PropertyValuesHolder.h"
18
19#include "utils/VectorDrawableUtils.h"
20
21#include <utils/Log.h>
22
23namespace android {
24namespace uirenderer {
25
26using namespace VectorDrawable;
27
28inline U8CPU lerp(U8CPU fromValue, U8CPU toValue, float fraction) {
29    return (U8CPU) (fromValue * (1 - fraction) + toValue * fraction);
30}
31
32// TODO: Add a test for this
33void ColorEvaluator::evaluate(SkColor* outColor,
34        const SkColor& fromColor, const SkColor& toColor, float fraction) const {
35    U8CPU alpha = lerp(SkColorGetA(fromColor), SkColorGetA(toColor), fraction);
36    U8CPU red = lerp(SkColorGetR(fromColor), SkColorGetR(toColor), fraction);
37    U8CPU green = lerp(SkColorGetG(fromColor), SkColorGetG(toColor), fraction);
38    U8CPU blue = lerp(SkColorGetB(fromColor), SkColorGetB(toColor), fraction);
39    *outColor = SkColorSetARGB(alpha, red, green, blue);
40}
41
42void PathEvaluator::evaluate(PathData* out,
43        const PathData& from, const PathData& to, float fraction) const {
44    VectorDrawableUtils::interpolatePaths(out, from, to, fraction);
45}
46
47template<typename T>
48const T PropertyValuesHolderImpl<T>::getValueFromData(float fraction) const {
49    if (mDataSource.size() == 0) {
50        LOG_ALWAYS_FATAL("No data source is defined");
51        return 0;
52    }
53    if (fraction <= 0.0f) {
54        return mDataSource.front();
55    }
56    if (fraction >= 1.0f) {
57        return mDataSource.back();
58    }
59
60    fraction *= mDataSource.size() - 1;
61    int lowIndex = floor(fraction);
62    fraction -= lowIndex;
63
64    T value;
65    mEvaluator->evaluate(&value, mDataSource[lowIndex], mDataSource[lowIndex + 1], fraction);
66    return value;
67}
68
69template<typename T>
70const T PropertyValuesHolderImpl<T>::calculateAnimatedValue(float fraction) const {
71    if (mDataSource.size() > 0) {
72        return getValueFromData(fraction);
73    } else {
74        T value;
75        mEvaluator->evaluate(&value, mStartValue, mEndValue, fraction);
76        return value;
77    }
78}
79
80void GroupPropertyValuesHolder::setFraction(float fraction) {
81    float animatedValue = calculateAnimatedValue(fraction);
82    mGroup->mutateProperties()->setPropertyValue(mPropertyId, animatedValue);
83}
84
85void FullPathColorPropertyValuesHolder::setFraction(float fraction) {
86    SkColor animatedValue = calculateAnimatedValue(fraction);
87    mFullPath->mutateProperties()->setColorPropertyValue(mPropertyId, animatedValue);
88}
89
90void FullPathPropertyValuesHolder::setFraction(float fraction) {
91    float animatedValue = calculateAnimatedValue(fraction);
92    mFullPath->mutateProperties()->setPropertyValue(mPropertyId, animatedValue);
93}
94
95void PathDataPropertyValuesHolder::setFraction(float fraction) {
96    mEvaluator->evaluate(&mPathData, mStartValue, mEndValue, fraction);
97    mPath->mutateProperties()->setData(mPathData);
98}
99
100void RootAlphaPropertyValuesHolder::setFraction(float fraction) {
101    float animatedValue = calculateAnimatedValue(fraction);
102    mTree->mutateProperties()->setRootAlpha(animatedValue);
103}
104
105} // namepace uirenderer
106} // namespace android
107