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 28 namespace android { 29 namespace uirenderer { 30 31 class 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 */ 43 class OffscreenBuffer : GpuMemoryTracker { 44 public: 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 setWindowTransform(const Matrix4 & transform)57 void setWindowTransform(const Matrix4& transform) { 58 inverseTransformInWindow.loadInverse(transform); 59 } 60 61 static uint32_t computeIdealDimension(uint32_t dimension); 62 getSizeInBytes()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 bool hasRenderedSinceRepaint; 82 }; 83 84 /** 85 * Pool of OffscreenBuffers allocated, but not currently in use. 86 */ 87 class OffscreenBufferPool { 88 public: 89 OffscreenBufferPool(); 90 ~OffscreenBufferPool(); 91 92 WARN_UNUSED_RESULT OffscreenBuffer* get(RenderState& renderState, 93 const uint32_t width, const uint32_t height); 94 95 WARN_UNUSED_RESULT OffscreenBuffer* resize(OffscreenBuffer* layer, 96 const uint32_t width, const uint32_t height); 97 98 void putOrDelete(OffscreenBuffer* layer); 99 100 /** 101 * Clears the pool. This causes all layers to be deleted. 102 */ 103 void clear(); 104 105 /** 106 * Returns the maximum size of the pool in bytes. 107 */ getMaxSize()108 uint32_t getMaxSize() { return mMaxSize; } 109 110 /** 111 * Returns the current size of the pool in bytes. 112 */ getSize()113 uint32_t getSize() { return mSize; } 114 getCount()115 size_t getCount() { return mPool.size(); } 116 117 /** 118 * Prints out the content of the pool. 119 */ 120 void dump(); 121 private: 122 struct Entry { EntryEntry123 Entry() {} 124 EntryEntry125 Entry(const uint32_t layerWidth, const uint32_t layerHeight) 126 : width(OffscreenBuffer::computeIdealDimension(layerWidth)) 127 , height(OffscreenBuffer::computeIdealDimension(layerHeight)) {} 128 EntryEntry129 Entry(OffscreenBuffer* layer) 130 : layer(layer) 131 , width(layer->texture.width()) 132 , height(layer->texture.height()) { 133 } 134 135 static int compare(const Entry& lhs, const Entry& rhs); 136 137 bool operator==(const Entry& other) const { 138 return compare(*this, other) == 0; 139 } 140 141 bool operator!=(const Entry& other) const { 142 return compare(*this, other) != 0; 143 } 144 145 bool operator<(const Entry& other) const { 146 return Entry::compare(*this, other) < 0; 147 } 148 149 OffscreenBuffer* layer = nullptr; 150 uint32_t width = 0; 151 uint32_t height = 0; 152 }; // struct Entry 153 154 std::multiset<Entry> mPool; 155 156 uint32_t mSize = 0; 157 uint32_t mMaxSize; 158 }; // class OffscreenBufferCache 159 160 }; // namespace uirenderer 161 }; // namespace android 162 163 #endif // ANDROID_HWUI_OFFSCREEN_BUFFER_POOL_H 164