1/* 2 * Copyright (C) 2010 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#ifndef ANDROID_HWUI_GRADIENT_CACHE_H 18#define ANDROID_HWUI_GRADIENT_CACHE_H 19 20#include <memory> 21 22#include <GLES3/gl3.h> 23 24#include <SkShader.h> 25 26#include <utils/LruCache.h> 27#include <utils/Mutex.h> 28#include <utils/Vector.h> 29 30namespace android { 31namespace uirenderer { 32 33class Texture; 34 35struct GradientCacheEntry { 36 GradientCacheEntry() { 37 count = 0; 38 colors = nullptr; 39 positions = nullptr; 40 } 41 42 GradientCacheEntry(uint32_t* colors, float* positions, uint32_t count) { 43 copy(colors, positions, count); 44 } 45 46 GradientCacheEntry(const GradientCacheEntry& entry) { 47 copy(entry.colors.get(), entry.positions.get(), entry.count); 48 } 49 50 GradientCacheEntry& operator=(const GradientCacheEntry& entry) { 51 if (this != &entry) { 52 copy(entry.colors.get(), entry.positions.get(), entry.count); 53 } 54 55 return *this; 56 } 57 58 hash_t hash() const; 59 60 static int compare(const GradientCacheEntry& lhs, const GradientCacheEntry& rhs); 61 62 bool operator==(const GradientCacheEntry& other) const { 63 return compare(*this, other) == 0; 64 } 65 66 bool operator!=(const GradientCacheEntry& other) const { 67 return compare(*this, other) != 0; 68 } 69 70 std::unique_ptr<uint32_t[]> colors; 71 std::unique_ptr<float[]> positions; 72 uint32_t count; 73 74private: 75 void copy(uint32_t* colors, float* positions, uint32_t count) { 76 this->count = count; 77 this->colors.reset(new uint32_t[count]); 78 this->positions.reset(new float[count]); 79 80 memcpy(this->colors.get(), colors, count * sizeof(uint32_t)); 81 memcpy(this->positions.get(), positions, count * sizeof(float)); 82 } 83 84}; // GradientCacheEntry 85 86// Caching support 87 88inline int strictly_order_type(const GradientCacheEntry& lhs, const GradientCacheEntry& rhs) { 89 return GradientCacheEntry::compare(lhs, rhs) < 0; 90} 91 92inline int compare_type(const GradientCacheEntry& lhs, const GradientCacheEntry& rhs) { 93 return GradientCacheEntry::compare(lhs, rhs); 94} 95 96inline hash_t hash_type(const GradientCacheEntry& entry) { 97 return entry.hash(); 98} 99 100/** 101 * A simple LRU gradient cache. The cache has a maximum size expressed in bytes. 102 * Any texture added to the cache causing the cache to grow beyond the maximum 103 * allowed size will also cause the oldest texture to be kicked out. 104 */ 105class GradientCache: public OnEntryRemoved<GradientCacheEntry, Texture*> { 106public: 107 GradientCache(Extensions& extensions); 108 ~GradientCache(); 109 110 /** 111 * Used as a callback when an entry is removed from the cache. 112 * Do not invoke directly. 113 */ 114 void operator()(GradientCacheEntry& shader, Texture*& texture) override; 115 116 /** 117 * Returns the texture associated with the specified shader. 118 */ 119 Texture* get(uint32_t* colors, float* positions, int count); 120 121 /** 122 * Clears the cache. This causes all textures to be deleted. 123 */ 124 void clear(); 125 126 /** 127 * Sets the maximum size of the cache in bytes. 128 */ 129 void setMaxSize(uint32_t maxSize); 130 /** 131 * Returns the maximum size of the cache in bytes. 132 */ 133 uint32_t getMaxSize(); 134 /** 135 * Returns the current size of the cache in bytes. 136 */ 137 uint32_t getSize(); 138 139private: 140 /** 141 * Adds a new linear gradient to the cache. The generated texture is 142 * returned. 143 */ 144 Texture* addLinearGradient(GradientCacheEntry& gradient, 145 uint32_t* colors, float* positions, int count); 146 147 void generateTexture(uint32_t* colors, float* positions, Texture* texture); 148 149 struct GradientInfo { 150 uint32_t width; 151 bool hasAlpha; 152 }; 153 154 void getGradientInfo(const uint32_t* colors, const int count, GradientInfo& info); 155 156 size_t bytesPerPixel() const; 157 158 struct GradientColor { 159 float r; 160 float g; 161 float b; 162 float a; 163 }; 164 165 typedef void (GradientCache::*ChannelSplitter)(uint32_t inColor, 166 GradientColor& outColor) const; 167 168 void splitToBytes(uint32_t inColor, GradientColor& outColor) const; 169 void splitToFloats(uint32_t inColor, GradientColor& outColor) const; 170 171 typedef void (GradientCache::*ChannelMixer)(GradientColor& start, GradientColor& end, 172 float amount, uint8_t*& dst) const; 173 174 void mixBytes(GradientColor& start, GradientColor& end, float amount, uint8_t*& dst) const; 175 void mixFloats(GradientColor& start, GradientColor& end, float amount, uint8_t*& dst) const; 176 177 LruCache<GradientCacheEntry, Texture*> mCache; 178 179 uint32_t mSize; 180 uint32_t mMaxSize; 181 182 GLint mMaxTextureSize; 183 bool mUseFloatTexture; 184 bool mHasNpot; 185 186 Vector<SkShader*> mGarbage; 187 mutable Mutex mLock; 188}; // class GradientCache 189 190}; // namespace uirenderer 191}; // namespace android 192 193#endif // ANDROID_HWUI_GRADIENT_CACHE_H 194