OffscreenBufferPool.h revision 98787e6c9b2c10b1ab7820bdac168686025b924a
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 "Caches.h" 21#include "Texture.h" 22#include "utils/Macros.h" 23 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 { 44public: 45 OffscreenBuffer(RenderState& renderState, Caches& caches, 46 uint32_t viewportWidth, uint32_t viewportHeight); 47 ~OffscreenBuffer(); 48 49 // must be called prior to rendering, to construct/update vertex buffer 50 void updateMeshFromRegion(); 51 52 // Set by RenderNode for HW layers, TODO for clipped saveLayers 53 void setWindowTransform(const Matrix4& transform) { 54 inverseTransformInWindow.loadInverse(transform); 55 } 56 57 static uint32_t computeIdealDimension(uint32_t dimension); 58 59 uint32_t getSizeInBytes() { return texture.width * texture.height * 4; } 60 61 RenderState& renderState; 62 63 uint32_t viewportWidth; 64 uint32_t viewportHeight; 65 Texture texture; 66 67 // Portion of layer that has been drawn to. Used to minimize drawing area when 68 // drawing back to screen / parent FBO. 69 Region region; 70 71 Matrix4 inverseTransformInWindow; 72 73 // vbo / size of mesh 74 GLsizei elementCount = 0; 75 GLuint vbo = 0; 76}; 77 78/** 79 * Pool of OffscreenBuffers allocated, but not currently in use. 80 */ 81class OffscreenBufferPool { 82public: 83 OffscreenBufferPool(); 84 ~OffscreenBufferPool(); 85 86 WARN_UNUSED_RESULT OffscreenBuffer* get(RenderState& renderState, 87 const uint32_t width, const uint32_t height); 88 89 WARN_UNUSED_RESULT OffscreenBuffer* resize(OffscreenBuffer* layer, 90 const uint32_t width, const uint32_t height); 91 92 void putOrDelete(OffscreenBuffer* layer); 93 94 /** 95 * Clears the pool. This causes all layers to be deleted. 96 */ 97 void clear(); 98 99 /** 100 * Returns the maximum size of the pool in bytes. 101 */ 102 uint32_t getMaxSize() { return mMaxSize; } 103 104 /** 105 * Returns the current size of the pool in bytes. 106 */ 107 uint32_t getSize() { return mSize; } 108 109 size_t getCount() { return mPool.size(); } 110 111 /** 112 * Prints out the content of the pool. 113 */ 114 void dump(); 115private: 116 struct Entry { 117 Entry() {} 118 119 Entry(const uint32_t layerWidth, const uint32_t layerHeight) 120 : width(OffscreenBuffer::computeIdealDimension(layerWidth)) 121 , height(OffscreenBuffer::computeIdealDimension(layerHeight)) {} 122 123 Entry(OffscreenBuffer* layer) 124 : layer(layer) 125 , width(layer->texture.width) 126 , height(layer->texture.height) { 127 } 128 129 static int compare(const Entry& lhs, const Entry& rhs); 130 131 bool operator==(const Entry& other) const { 132 return compare(*this, other) == 0; 133 } 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 Entry::compare(*this, other) < 0; 141 } 142 143 OffscreenBuffer* layer = nullptr; 144 uint32_t width = 0; 145 uint32_t height = 0; 146 }; // struct Entry 147 148 std::multiset<Entry> mPool; 149 150 uint32_t mSize = 0; 151 uint32_t mMaxSize; 152}; // class OffscreenBufferCache 153 154}; // namespace uirenderer 155}; // namespace android 156 157#endif // ANDROID_HWUI_OFFSCREEN_BUFFER_POOL_H 158