LayerCache.cpp revision c9855a53edfac818dc68714557185977556f849d
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->width * layer->height * 4; 72 glDeleteTextures(1, &layer->texture); 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->width * layer->height * 4; 97 98 LAYER_LOGD("Reusing layer %dx%d", layer->width, layer->height); 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->blend = true; 104 layer->empty = true; 105 layer->fbo = 0; 106 layer->colorFilter = NULL; 107 108 glGenTextures(1, &layer->texture); 109 glBindTexture(GL_TEXTURE_2D, layer->texture); 110 111 glPixelStorei(GL_UNPACK_ALIGNMENT, 4); 112 113 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 114 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 115 116 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 117 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 118 119#if DEBUG_LAYERS 120 size_t size = mCache.size(); 121 for (size_t i = 0; i < size; i++) { 122 const LayerEntry& entry = mCache.itemAt(i); 123 LAYER_LOGD(" Layer size %dx%d", entry.mWidth, entry.mHeight); 124 } 125#endif 126 } 127 128 return layer; 129} 130 131bool LayerCache::put(Layer* layer) { 132 const uint32_t size = layer->width * layer->height * 4; 133 // Don't even try to cache a layer that's bigger than the cache 134 if (size < mMaxSize) { 135 // TODO: Use an LRU 136 while (mSize + size > mMaxSize) { 137 size_t position = 0; 138#if LAYER_REMOVE_BIGGEST 139 position = mCache.size() - 1; 140#endif 141 Layer* victim = mCache.itemAt(position).mLayer; 142 deleteLayer(victim); 143 mCache.removeAt(position); 144 145 LAYER_LOGD(" Deleting layer %.2fx%.2f", victim->layer.getWidth(), 146 victim->layer.getHeight()); 147 } 148 149 LayerEntry entry(layer); 150 151 mCache.add(entry); 152 mSize += size; 153 154 return true; 155 } 156 return false; 157} 158 159}; // namespace uirenderer 160}; // namespace android 161