LayerCache.h revision 9ace8f5e79e76893fe4ca9e4d10f6c4056330485
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_LAYER_CACHE_H 18#define ANDROID_HWUI_LAYER_CACHE_H 19 20#include "Debug.h" 21#include "Layer.h" 22#include "utils/SortedList.h" 23 24namespace android { 25namespace uirenderer { 26 27/////////////////////////////////////////////////////////////////////////////// 28// Defines 29/////////////////////////////////////////////////////////////////////////////// 30 31// Indicates whether to remove the biggest layers first, or the smaller ones 32#define LAYER_REMOVE_BIGGEST 0 33// Textures used by layers must have dimensions multiples of this number 34#define LAYER_SIZE 64 35 36// Debug 37#if DEBUG_LAYERS 38 #define LAYER_LOGD(...) LOGD(__VA_ARGS__) 39#else 40 #define LAYER_LOGD(...) 41#endif 42 43/////////////////////////////////////////////////////////////////////////////// 44// Cache 45/////////////////////////////////////////////////////////////////////////////// 46 47class LayerCache { 48public: 49 LayerCache(); 50 ~LayerCache(); 51 52 /** 53 * Returns a layer large enough for the specified dimensions. If no suitable 54 * layer can be found, a new one is created and returned. If creating a new 55 * layer fails, NULL is returned. 56 * 57 * When a layer is obtained from the cache, it is removed and the total 58 * size of the cache goes down. 59 * 60 * @param width The desired width of the layer 61 * @param width The desired height of the layer 62 */ 63 Layer* get(const uint32_t width, const uint32_t height); 64 65 /** 66 * Adds the layer to the cache. The layer will not be added if there is 67 * not enough space available. Adding a layer can cause other layers to 68 * be removed from the cache. 69 * 70 * @param layer The layer to add to the cache 71 * 72 * @return True if the layer was added, false otherwise. 73 */ 74 bool put(Layer* layer); 75 /** 76 * Clears the cache. This causes all layers to be deleted. 77 */ 78 void clear(); 79 /** 80 * Resize the specified layer if needed. 81 * 82 * @param layer The layer to resize 83 * @param width The new width of the layer 84 * @param height The new height of the layer 85 * 86 * @return True if the layer was resized or nothing happened, false if 87 * a failure occurred during the resizing operation 88 */ 89 bool resize(Layer* layer, const uint32_t width, const uint32_t height); 90 91 /** 92 * Sets the maximum size of the cache in bytes. 93 */ 94 void setMaxSize(uint32_t maxSize); 95 /** 96 * Returns the maximum size of the cache in bytes. 97 */ 98 uint32_t getMaxSize(); 99 /** 100 * Returns the current size of the cache in bytes. 101 */ 102 uint32_t getSize(); 103 104private: 105 void deleteLayer(Layer* layer); 106 107 struct LayerEntry { 108 LayerEntry(): 109 mLayer(NULL), mWidth(0), mHeight(0) { 110 } 111 112 LayerEntry(const uint32_t layerWidth, const uint32_t layerHeight): mLayer(NULL) { 113 mWidth = uint32_t(ceilf(layerWidth / float(LAYER_SIZE)) * LAYER_SIZE); 114 mHeight = uint32_t(ceilf(layerHeight / float(LAYER_SIZE)) * LAYER_SIZE); 115 } 116 117 LayerEntry(const LayerEntry& entry): 118 mLayer(entry.mLayer), mWidth(entry.mWidth), mHeight(entry.mHeight) { 119 } 120 121 LayerEntry(Layer* layer): 122 mLayer(layer), mWidth(layer->getWidth()), mHeight(layer->getHeight()) { 123 } 124 125 bool operator<(const LayerEntry& rhs) const { 126 if (mWidth == rhs.mWidth) { 127 return mHeight < rhs.mHeight; 128 } 129 return mWidth < rhs.mWidth; 130 } 131 132 bool operator==(const LayerEntry& rhs) const { 133 return mWidth == rhs.mWidth && mHeight == rhs.mHeight; 134 } 135 136 Layer* mLayer; 137 uint32_t mWidth; 138 uint32_t mHeight; 139 }; // struct LayerEntry 140 141 SortedList<LayerEntry> mCache; 142 143 uint32_t mSize; 144 uint32_t mMaxSize; 145}; // class LayerCache 146 147}; // namespace uirenderer 148}; // namespace android 149 150#endif // ANDROID_HWUI_LAYER_CACHE_H 151