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