2 * Copyright (C) 2016 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #include "VectorDrawable.h"
24 namespace uirenderer {
27 * PropertyValues holder contains data needed to change a property of a Vector Drawable object.
28 * When a fraction in [0f, 1f] is provided, the holder will calculate an interpolated value based
29 * on its start and end value, and set the new value on the VectorDrawble's corresponding property.
31 class ANDROID_API PropertyValuesHolder {
33 virtual void setFraction(float fraction) = 0;
34 virtual ~PropertyValuesHolder() {}
40 virtual void evaluate(T* out, const T& from, const T& to, float fraction) const {};
41 virtual ~Evaluator() {}
44 class FloatEvaluator : public Evaluator<float> {
46 virtual void evaluate(float* out, const float& from, const float& to, float fraction)
48 *out = from * (1 - fraction) + to * fraction;
52 class ANDROID_API ColorEvaluator : public Evaluator<SkColor> {
54 virtual void evaluate(SkColor* outColor, const SkColor& from, const SkColor& to,
55 float fraction) const override;
58 class ANDROID_API PathEvaluator : public Evaluator<PathData> {
59 virtual void evaluate(PathData* out, const PathData& from, const PathData& to, float fraction)
64 class ANDROID_API PropertyValuesHolderImpl : public PropertyValuesHolder {
66 PropertyValuesHolderImpl(const T& startValue, const T& endValue)
67 : mStartValue(startValue)
68 , mEndValue(endValue) {}
69 void setPropertyDataSource(T* dataSource, int length) {
70 mDataSource.insert(mDataSource.begin(), dataSource, dataSource + length);
72 // Calculate the animated value from the data source.
73 const T getValueFromData(float fraction) const;
74 // Convenient method to favor getting animated value from data source. If no data source is set
75 // fall back to linear interpolation.
76 const T calculateAnimatedValue(float fraction) const;
78 std::unique_ptr<Evaluator<T>> mEvaluator = nullptr;
79 // This contains uniformly sampled data throughout the animation duration. The first element
80 // should be the start value and the last should be the end value of the animation. When the
81 // data source is set, we'll favor data source over the linear interpolation of start/end value
82 // for calculation of animated value.
83 std::vector<T> mDataSource;
88 class ANDROID_API GroupPropertyValuesHolder : public PropertyValuesHolderImpl<float> {
90 GroupPropertyValuesHolder(VectorDrawable::Group* ptr, int propertyId, float startValue,
92 : PropertyValuesHolderImpl(startValue, endValue)
94 , mPropertyId(propertyId) {
95 mEvaluator.reset(new FloatEvaluator());
97 void setFraction(float fraction) override;
99 VectorDrawable::Group* mGroup;
103 class ANDROID_API FullPathColorPropertyValuesHolder : public PropertyValuesHolderImpl<SkColor> {
105 FullPathColorPropertyValuesHolder(VectorDrawable::FullPath* ptr, int propertyId,
106 SkColor startValue, SkColor endValue)
107 : PropertyValuesHolderImpl(startValue, endValue)
109 , mPropertyId(propertyId) {
110 mEvaluator.reset(new ColorEvaluator());
112 void setFraction(float fraction) override;
113 static SkColor interpolateColors(SkColor fromColor, SkColor toColor, float fraction);
115 VectorDrawable::FullPath* mFullPath;
119 class ANDROID_API FullPathPropertyValuesHolder : public PropertyValuesHolderImpl<float> {
121 FullPathPropertyValuesHolder(VectorDrawable::FullPath* ptr, int propertyId, float startValue,
123 : PropertyValuesHolderImpl(startValue, endValue)
125 , mPropertyId(propertyId) {
126 mEvaluator.reset(new FloatEvaluator());
128 void setFraction(float fraction) override;
130 VectorDrawable::FullPath* mFullPath;
134 class ANDROID_API PathDataPropertyValuesHolder : public PropertyValuesHolderImpl<PathData> {
136 PathDataPropertyValuesHolder(VectorDrawable::Path* ptr, PathData* startValue,
138 : PropertyValuesHolderImpl(*startValue, *endValue)
140 mEvaluator.reset(new PathEvaluator());
142 void setFraction(float fraction) override;
144 VectorDrawable::Path* mPath;
148 class ANDROID_API RootAlphaPropertyValuesHolder : public PropertyValuesHolderImpl<float> {
150 RootAlphaPropertyValuesHolder(VectorDrawable::Tree* tree, float startValue, float endValue)
151 : PropertyValuesHolderImpl(startValue, endValue)
153 mEvaluator.reset(new FloatEvaluator());
155 void setFraction(float fraction) override;
157 VectorDrawable::Tree* mTree;