OffscreenBufferPool.h revision 64db2bf1118db88c937e2b8c61b299bb2a80e3cb
1/* 2 * Copyright (C) 2015 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_OFFSCREEN_BUFFER_POOL_H 18#define ANDROID_HWUI_OFFSCREEN_BUFFER_POOL_H 19 20#include <GpuMemoryTracker.h> 21#include "Caches.h" 22#include "Texture.h" 23#include "utils/Macros.h" 24#include <ui/Region.h> 25 26#include <set> 27 28namespace android { 29namespace uirenderer { 30 31class RenderState; 32 33/** 34 * Lightweight alternative to Layer. Owns the persistent state of an offscreen render target, and 35 * encompasses enough information to draw it back on screen (minus paint properties, which are held 36 * by LayerOp). 37 * 38 * Has two distinct sizes - viewportWidth/viewportHeight describe content area, 39 * texture.width/.height are actual allocated texture size. Texture will tend to be larger than the 40 * viewport bounds, since textures are always allocated with width / height as a multiple of 64, for 41 * the purpose of improving reuse. 42 */ 43class OffscreenBuffer : GpuMemoryTracker { 44public: 45 OffscreenBuffer(RenderState& renderState, Caches& caches, 46 uint32_t viewportWidth, uint32_t viewportHeight); 47 ~OffscreenBuffer(); 48 49 Rect getTextureCoordinates(); 50 51 void dirty(Rect dirtyArea); 52 53 // must be called prior to rendering, to construct/update vertex buffer 54 void updateMeshFromRegion(); 55 56 // Set by RenderNode for HW layers, TODO for clipped saveLayers 57 void setWindowTransform(const Matrix4& transform) { 58 inverseTransformInWindow.loadInverse(transform); 59 } 60 61 static uint32_t computeIdealDimension(uint32_t dimension); 62 63 uint32_t getSizeInBytes() { return texture.objectSize(); } 64 65 RenderState& renderState; 66 67 uint32_t viewportWidth; 68 uint32_t viewportHeight; 69 Texture texture; 70 71 // Portion of layer that has been drawn to. Used to minimize drawing area when 72 // drawing back to screen / parent FBO. 73 Region region; 74 75 Matrix4 inverseTransformInWindow; 76 77 // vbo / size of mesh 78 GLsizei elementCount = 0; 79 GLuint vbo = 0; 80}; 81 82/** 83 * Pool of OffscreenBuffers allocated, but not currently in use. 84 */ 85class OffscreenBufferPool { 86public: 87 OffscreenBufferPool(); 88 ~OffscreenBufferPool(); 89 90 WARN_UNUSED_RESULT OffscreenBuffer* get(RenderState& renderState, 91 const uint32_t width, const uint32_t height); 92 93 WARN_UNUSED_RESULT OffscreenBuffer* resize(OffscreenBuffer* layer, 94 const uint32_t width, const uint32_t height); 95 96 void putOrDelete(OffscreenBuffer* layer); 97 98 /** 99 * Clears the pool. This causes all layers to be deleted. 100 */ 101 void clear(); 102 103 /** 104 * Returns the maximum size of the pool in bytes. 105 */ 106 uint32_t getMaxSize() { return mMaxSize; } 107 108 /** 109 * Returns the current size of the pool in bytes. 110 */ 111 uint32_t getSize() { return mSize; } 112 113 size_t getCount() { return mPool.size(); } 114 115 /** 116 * Prints out the content of the pool. 117 */ 118 void dump(); 119private: 120 struct Entry { 121 Entry() {} 122 123 Entry(const uint32_t layerWidth, const uint32_t layerHeight) 124 : width(OffscreenBuffer::computeIdealDimension(layerWidth)) 125 , height(OffscreenBuffer::computeIdealDimension(layerHeight)) {} 126 127 Entry(OffscreenBuffer* layer) 128 : layer(layer) 129 , width(layer->texture.width()) 130 , height(layer->texture.height()) { 131 } 132 133 static int compare(const Entry& lhs, const Entry& rhs); 134 135 bool operator==(const Entry& other) const { 136 return compare(*this, other) == 0; 137 } 138 139 bool operator!=(const Entry& other) const { 140 return compare(*this, other) != 0; 141 } 142 143 bool operator<(const Entry& other) const { 144 return Entry::compare(*this, other) < 0; 145 } 146 147 OffscreenBuffer* layer = nullptr; 148 uint32_t width = 0; 149 uint32_t height = 0; 150 }; // struct Entry 151 152 std::multiset<Entry> mPool; 153 154 uint32_t mSize = 0; 155 uint32_t mMaxSize; 156}; // class OffscreenBufferCache 157 158}; // namespace uirenderer 159}; // namespace android 160 161#endif // ANDROID_HWUI_OFFSCREEN_BUFFER_POOL_H 162