LayerCache.cpp revision 17035b0211a3c9d45ea46a99217a6acbe76e8fbe
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 "Caches.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 52size_t LayerCache::getCount() { 53 return mCache.size(); 54} 55 56uint32_t LayerCache::getSize() { 57 return mSize; 58} 59 60uint32_t LayerCache::getMaxSize() { 61 return mMaxSize; 62} 63 64void LayerCache::setMaxSize(uint32_t maxSize) { 65 clear(); 66 mMaxSize = maxSize; 67} 68 69/////////////////////////////////////////////////////////////////////////////// 70// Caching 71/////////////////////////////////////////////////////////////////////////////// 72 73int LayerCache::LayerEntry::compare(const LayerCache::LayerEntry& lhs, 74 const LayerCache::LayerEntry& rhs) { 75 int deltaInt = int(lhs.mWidth) - int(rhs.mWidth); 76 if (deltaInt != 0) return deltaInt; 77 78 return int(lhs.mHeight) - int(rhs.mHeight); 79} 80 81void LayerCache::deleteLayer(Layer* layer) { 82 if (layer) { 83 LAYER_LOGD("Destroying layer %dx%d, fbo %d", layer->getWidth(), layer->getHeight(), 84 layer->getFbo()); 85 mSize -= layer->getWidth() * layer->getHeight() * 4; 86 Caches::getInstance().resourceCache.decrementRefcount(layer); 87 } 88} 89 90void LayerCache::clear() { 91 size_t count = mCache.size(); 92 for (size_t i = 0; i < count; i++) { 93 deleteLayer(mCache.itemAt(i).mLayer); 94 } 95 mCache.clear(); 96} 97 98Layer* LayerCache::get(RenderState& renderState, const uint32_t width, const uint32_t height) { 99 Layer* layer = NULL; 100 101 LayerEntry entry(width, height); 102 ssize_t index = mCache.indexOf(entry); 103 104 if (index >= 0) { 105 entry = mCache.itemAt(index); 106 mCache.removeAt(index); 107 108 layer = entry.mLayer; 109 mSize -= layer->getWidth() * layer->getHeight() * 4; 110 111 LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight()); 112 } else { 113 LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight); 114 115 layer = new Layer(renderState, entry.mWidth, entry.mHeight); 116 layer->setBlend(true); 117 layer->setEmpty(true); 118 layer->setFbo(0); 119 120 layer->generateTexture(); 121 layer->bindTexture(); 122 layer->setFilter(GL_NEAREST); 123 layer->setWrap(GL_CLAMP_TO_EDGE, false); 124 glPixelStorei(GL_UNPACK_ALIGNMENT, 4); 125 126#if DEBUG_LAYERS 127 dump(); 128#endif 129 } 130 131 return layer; 132} 133 134void LayerCache::dump() { 135 size_t size = mCache.size(); 136 for (size_t i = 0; i < size; i++) { 137 const LayerEntry& entry = mCache.itemAt(i); 138 LAYER_LOGD(" Layer size %dx%d", entry.mWidth, entry.mHeight); 139 } 140} 141 142bool LayerCache::put(Layer* layer) { 143 if (!layer->isCacheable()) return false; 144 145 const uint32_t size = layer->getWidth() * layer->getHeight() * 4; 146 // Don't even try to cache a layer that's bigger than the cache 147 if (size < mMaxSize) { 148 // TODO: Use an LRU 149 while (mSize + size > mMaxSize) { 150 size_t position = 0; 151#if LAYER_REMOVE_BIGGEST_FIRST 152 position = mCache.size() - 1; 153#endif 154 Layer* victim = mCache.itemAt(position).mLayer; 155 deleteLayer(victim); 156 mCache.removeAt(position); 157 158 LAYER_LOGD(" Deleting layer %.2fx%.2f", victim->layer.getWidth(), 159 victim->layer.getHeight()); 160 } 161 162 layer->cancelDefer(); 163 164 LayerEntry entry(layer); 165 166 mCache.add(entry); 167 mSize += size; 168 169 return true; 170 } 171 return false; 172} 173 174}; // namespace uirenderer 175}; // namespace android 176