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_TEXTURE_CACHE_H 18 #define ANDROID_HWUI_TEXTURE_CACHE_H 19 20 #include <SkBitmap.h> 21 22 #include <utils/Vector.h> 23 24 #include "Debug.h" 25 #include "Texture.h" 26 #include "utils/GenerationCache.h" 27 28 namespace android { 29 namespace uirenderer { 30 31 /////////////////////////////////////////////////////////////////////////////// 32 // Defines 33 /////////////////////////////////////////////////////////////////////////////// 34 35 // Debug 36 #if DEBUG_TEXTURES 37 #define TEXTURE_LOGD(...) LOGD(__VA_ARGS__) 38 #else 39 #define TEXTURE_LOGD(...) 40 #endif 41 42 /////////////////////////////////////////////////////////////////////////////// 43 // Classes 44 /////////////////////////////////////////////////////////////////////////////// 45 46 /** 47 * A simple LRU texture cache. The cache has a maximum size expressed in bytes. 48 * Any texture added to the cache causing the cache to grow beyond the maximum 49 * allowed size will also cause the oldest texture to be kicked out. 50 */ 51 class TextureCache: public OnEntryRemoved<SkBitmap*, Texture*> { 52 public: 53 TextureCache(); 54 TextureCache(uint32_t maxByteSize); 55 ~TextureCache(); 56 57 /** 58 * Used as a callback when an entry is removed from the cache. 59 * Do not invoke directly. 60 */ 61 void operator()(SkBitmap*& bitmap, Texture*& texture); 62 63 /** 64 * Returns the texture associated with the specified bitmap. If the texture 65 * cannot be found in the cache, a new texture is generated. 66 */ 67 Texture* get(SkBitmap* bitmap); 68 /** 69 * Removes the texture associated with the specified bitmap. 70 * Upon remove the texture is freed. 71 */ 72 void remove(SkBitmap* bitmap); 73 /** 74 * Removes the texture associated with the specified bitmap. This is meant 75 * to be called from threads that are not the EGL context thread. 76 */ 77 void removeDeferred(SkBitmap* bitmap); 78 /** 79 * Process deferred removals. 80 */ 81 void clearGarbage(); 82 83 /** 84 * Clears the cache. This causes all textures to be deleted. 85 */ 86 void clear(); 87 88 /** 89 * Sets the maximum size of the cache in bytes. 90 */ 91 void setMaxSize(uint32_t maxSize); 92 /** 93 * Returns the maximum size of the cache in bytes. 94 */ 95 uint32_t getMaxSize(); 96 /** 97 * Returns the current size of the cache in bytes. 98 */ 99 uint32_t getSize(); 100 101 private: 102 /** 103 * Generates the texture from a bitmap into the specified texture structure. 104 * 105 * @param regenerate If true, the bitmap data is reuploaded into the texture, but 106 * no new texture is generated. 107 */ 108 void generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate = false); 109 110 void uploadLoFiTexture(bool resize, SkBitmap* bitmap, uint32_t width, uint32_t height); 111 void uploadToTexture(bool resize, GLenum format, GLsizei width, GLsizei height, 112 GLenum type, const GLvoid * data); 113 114 void init(); 115 116 GenerationCache<SkBitmap*, Texture*> mCache; 117 118 uint32_t mSize; 119 uint32_t mMaxSize; 120 GLint mMaxTextureSize; 121 122 bool mDebugEnabled; 123 124 Vector<SkBitmap*> mGarbage; 125 mutable Mutex mLock; 126 }; // class TextureCache 127 128 }; // namespace uirenderer 129 }; // namespace android 130 131 #endif // ANDROID_HWUI_TEXTURE_CACHE_H 132