LayerCache.cpp revision e3c26851dc315b730ea0fe5ef35bb1db81f6d675
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#define LOG_TAG "OpenGLRenderer" 18 19#include <GLES2/gl2.h> 20 21#include <utils/Log.h> 22 23#include "Debug.h" 24#include "LayerCache.h" 25#include "Properties.h" 26 27namespace android { 28namespace uirenderer { 29 30/////////////////////////////////////////////////////////////////////////////// 31// Constructors/destructor 32/////////////////////////////////////////////////////////////////////////////// 33 34LayerCache::LayerCache(): mSize(0), mMaxSize(MB(DEFAULT_LAYER_CACHE_SIZE)) { 35 char property[PROPERTY_VALUE_MAX]; 36 if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) { 37 INIT_LOGD(" Setting layer cache size to %sMB", property); 38 setMaxSize(MB(atof(property))); 39 } else { 40 INIT_LOGD(" Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE); 41 } 42} 43 44LayerCache::~LayerCache() { 45 clear(); 46} 47 48/////////////////////////////////////////////////////////////////////////////// 49// Size management 50/////////////////////////////////////////////////////////////////////////////// 51 52uint32_t LayerCache::getSize() { 53 return mSize; 54} 55 56uint32_t LayerCache::getMaxSize() { 57 return mMaxSize; 58} 59 60void LayerCache::setMaxSize(uint32_t maxSize) { 61 clear(); 62 mMaxSize = maxSize; 63} 64 65/////////////////////////////////////////////////////////////////////////////// 66// Caching 67/////////////////////////////////////////////////////////////////////////////// 68 69void LayerCache::deleteLayer(Layer* layer) { 70 if (layer) { 71 mSize -= layer->getWidth() * layer->getHeight() * 4; 72 layer->deleteTexture(); 73 delete layer; 74 } 75} 76 77void LayerCache::clear() { 78 size_t count = mCache.size(); 79 for (size_t i = 0; i < count; i++) { 80 deleteLayer(mCache.itemAt(i).mLayer); 81 } 82 mCache.clear(); 83} 84 85Layer* LayerCache::get(const uint32_t width, const uint32_t height) { 86 Layer* layer = NULL; 87 88 LayerEntry entry(width, height); 89 ssize_t index = mCache.indexOf(entry); 90 91 if (index >= 0) { 92 entry = mCache.itemAt(index); 93 mCache.removeAt(index); 94 95 layer = entry.mLayer; 96 mSize -= layer->getWidth() * layer->getHeight() * 4; 97 98 LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight()); 99 } else { 100 LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight); 101 102 layer = new Layer(entry.mWidth, entry.mHeight); 103 layer->setBlend(true); 104 layer->setEmpty(true); 105 layer->setFbo(0); 106 107 layer->generateTexture(); 108 layer->bindTexture(); 109 layer->setFilter(GL_NEAREST, GL_NEAREST); 110 layer->setWrap(GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, false); 111 glPixelStorei(GL_UNPACK_ALIGNMENT, 4); 112 113#if DEBUG_LAYERS 114 size_t size = mCache.size(); 115 for (size_t i = 0; i < size; i++) { 116 const LayerEntry& entry = mCache.itemAt(i); 117 LAYER_LOGD(" Layer size %dx%d", entry.mWidth, entry.mHeight); 118 } 119#endif 120 } 121 122 return layer; 123} 124 125bool LayerCache::resize(Layer* layer, const uint32_t width, const uint32_t height) { 126 // TODO: We should be smarter and see if we have a texture of the appropriate 127 // size already in the cache, and reuse it instead of creating a new one 128 129 LayerEntry entry(width, height); 130 if (entry.mWidth <= layer->getWidth() && entry.mHeight <= layer->getHeight()) { 131 return true; 132 } 133 134 uint32_t oldWidth = layer->getWidth(); 135 uint32_t oldHeight = layer->getHeight(); 136 137 glActiveTexture(GL_TEXTURE0); 138 layer->bindTexture(); 139 layer->setSize(entry.mWidth, entry.mHeight); 140 layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE); 141 142 if (glGetError() != GL_NO_ERROR) { 143 layer->setSize(oldWidth, oldHeight); 144 return false; 145 } 146 147 return true; 148} 149 150bool LayerCache::put(Layer* layer) { 151 if (!layer->isCacheable()) return false; 152 153 const uint32_t size = layer->getWidth() * layer->getHeight() * 4; 154 // Don't even try to cache a layer that's bigger than the cache 155 if (size < mMaxSize) { 156 // TODO: Use an LRU 157 while (mSize + size > mMaxSize) { 158 size_t position = 0; 159#if LAYER_REMOVE_BIGGEST 160 position = mCache.size() - 1; 161#endif 162 Layer* victim = mCache.itemAt(position).mLayer; 163 deleteLayer(victim); 164 mCache.removeAt(position); 165 166 LAYER_LOGD(" Deleting layer %.2fx%.2f", victim->layer.getWidth(), 167 victim->layer.getHeight()); 168 } 169 170 LayerEntry entry(layer); 171 172 mCache.add(entry); 173 mSize += size; 174 175 return true; 176 } 177 return false; 178} 179 180}; // namespace uirenderer 181}; // namespace android 182