LayerCache.cpp revision fb8b763f762ae21923c58d64caa729b012f40e05
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 "LayerCache.h" 24#include "Properties.h" 25 26namespace android { 27namespace uirenderer { 28 29/////////////////////////////////////////////////////////////////////////////// 30// Constructors/destructor 31/////////////////////////////////////////////////////////////////////////////// 32 33LayerCache::LayerCache(): 34 mCache(GenerationCache<LayerSize, Layer*>::kUnlimitedCapacity), 35 mIdGenerator(1), mSize(0), mMaxSize(MB(DEFAULT_LAYER_CACHE_SIZE)) { 36 char property[PROPERTY_VALUE_MAX]; 37 if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) { 38 LOGD(" Setting layer cache size to %sMB", property); 39 setMaxSize(MB(atof(property))); 40 } else { 41 LOGD(" Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE); 42 } 43} 44 45LayerCache::LayerCache(uint32_t maxByteSize): 46 mCache(GenerationCache<LayerSize, Layer*>::kUnlimitedCapacity), 47 mIdGenerator(1), mSize(0), mMaxSize(maxByteSize) { 48} 49 50LayerCache::~LayerCache() { 51 clear(); 52} 53 54/////////////////////////////////////////////////////////////////////////////// 55// Size management 56/////////////////////////////////////////////////////////////////////////////// 57 58uint32_t LayerCache::getSize() { 59 return mSize; 60} 61 62uint32_t LayerCache::getMaxSize() { 63 return mMaxSize; 64} 65 66void LayerCache::setMaxSize(uint32_t maxSize) { 67 mMaxSize = maxSize; 68 while (mSize > mMaxSize) { 69 Layer* oldest = mCache.removeOldest(); 70 deleteLayer(oldest); 71 } 72} 73 74/////////////////////////////////////////////////////////////////////////////// 75// Callbacks 76/////////////////////////////////////////////////////////////////////////////// 77 78void LayerCache::operator()(LayerSize& size, Layer*& layer) { 79 deleteLayer(layer); 80} 81 82/////////////////////////////////////////////////////////////////////////////// 83// Caching 84/////////////////////////////////////////////////////////////////////////////// 85 86void LayerCache::deleteLayer(Layer* layer) { 87 if (layer) { 88 mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4; 89 90 glDeleteFramebuffers(1, &layer->fbo); 91 glDeleteTextures(1, &layer->texture); 92 delete layer; 93 } 94} 95 96void LayerCache::clear() { 97 mCache.setOnEntryRemovedListener(this); 98 mCache.clear(); 99 mCache.setOnEntryRemovedListener(NULL); 100} 101 102Layer* LayerCache::get(LayerSize& size, GLuint previousFbo) { 103 Layer* layer = mCache.remove(size); 104 if (layer) { 105 LAYER_LOGD("Reusing layer"); 106 107 mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4; 108 } else { 109 LAYER_LOGD("Creating new layer"); 110 111 layer = new Layer; 112 layer->blend = true; 113 114 // Generate the FBO and attach the texture 115 glGenFramebuffers(1, &layer->fbo); 116 glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo); 117 118 // Generate the texture in which the FBO will draw 119 glGenTextures(1, &layer->texture); 120 glBindTexture(GL_TEXTURE_2D, layer->texture); 121 122 // The FBO will not be scaled, so we can use lower quality filtering 123 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 124 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 125 126 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 127 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 128 129 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width, size.height, 0, 130 GL_RGBA, GL_UNSIGNED_BYTE, NULL); 131 132 // Bind texture to FBO 133 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 134 layer->texture, 0); 135 136 GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER); 137 if (status != GL_FRAMEBUFFER_COMPLETE) { 138 LOGE("Framebuffer incomplete (GL error code 0x%x)", status); 139 140 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 141 142 glDeleteFramebuffers(1, &layer->fbo); 143 glDeleteTextures(1, &layer->texture); 144 delete layer; 145 146 return NULL; 147 } 148 } 149 150 return layer; 151} 152 153bool LayerCache::put(LayerSize& layerSize, Layer* layer) { 154 const uint32_t size = layerSize.width * layerSize.height * 4; 155 // Don't even try to cache a layer that's bigger than the cache 156 if (size < mMaxSize) { 157 while (mSize + size > mMaxSize) { 158 Layer* oldest = mCache.removeOldest(); 159 deleteLayer(oldest); 160 } 161 162 layerSize.id = mIdGenerator++; 163 mCache.put(layerSize, layer); 164 mSize += size; 165 166 return true; 167 } 168 return false; 169} 170 171}; // namespace uirenderer 172}; // namespace android 173