1 /* 2 * Copyright (C) 2012 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_CACHE_TEXTURE_H 18 #define ANDROID_HWUI_CACHE_TEXTURE_H 19 20 #include "PixelBuffer.h" 21 #include "Rect.h" 22 #include "Texture.h" 23 #include "Vertex.h" 24 25 #include <GLES3/gl3.h> 26 #include <SkGlyph.h> 27 #include <utils/Log.h> 28 29 30 namespace android { 31 namespace uirenderer { 32 33 class Caches; 34 35 /** 36 * CacheBlock is a node in a linked list of current free space areas in a CacheTexture. 37 * Using CacheBlocks enables us to pack the cache from top to bottom as well as left to right. 38 * When we add a glyph to the cache, we see if it fits within one of the existing columns that 39 * have already been started (this is the case if the glyph fits vertically as well as 40 * horizontally, and if its width is sufficiently close to the column width to avoid 41 * sub-optimal packing of small glyphs into wide columns). If there is no column in which the 42 * glyph fits, we check the final node, which is the remaining space in the cache, creating 43 * a new column as appropriate. 44 * 45 * As columns fill up, we remove their CacheBlock from the list to avoid having to check 46 * small blocks in the future. 47 */ 48 struct CacheBlock { 49 uint16_t mX; 50 uint16_t mY; 51 uint16_t mWidth; 52 uint16_t mHeight; 53 CacheBlock* mNext; 54 CacheBlock* mPrev; 55 CacheBlockCacheBlock56 CacheBlock(uint16_t x, uint16_t y, uint16_t width, uint16_t height): 57 mX(x), mY(y), mWidth(width), mHeight(height), mNext(nullptr), mPrev(nullptr) { 58 } 59 60 static CacheBlock* insertBlock(CacheBlock* head, CacheBlock* newBlock); 61 static CacheBlock* removeBlock(CacheBlock* head, CacheBlock* blockToRemove); 62 outputCacheBlock63 void output() { 64 CacheBlock* currBlock = this; 65 while (currBlock) { 66 ALOGD("Block: this, x, y, w, h = %p, %d, %d, %d, %d", 67 currBlock, currBlock->mX, currBlock->mY, 68 currBlock->mWidth, currBlock->mHeight); 69 currBlock = currBlock->mNext; 70 } 71 } 72 }; 73 74 class CacheTexture { 75 public: 76 CacheTexture(uint16_t width, uint16_t height, GLenum format, uint32_t maxQuadCount); 77 ~CacheTexture(); 78 79 void reset(); 80 void init(); 81 82 void releaseMesh(); 83 void releasePixelBuffer(); 84 85 void allocatePixelBuffer(); 86 void allocateMesh(); 87 88 // Returns true if glPixelStorei(GL_UNPACK_ROW_LENGTH) must be reset 89 // This method will also call setDirty(false) 90 bool upload(); 91 92 bool fitBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY); 93 getWidth()94 inline uint16_t getWidth() const { 95 return mWidth; 96 } 97 getHeight()98 inline uint16_t getHeight() const { 99 return mHeight; 100 } 101 getFormat()102 inline GLenum getFormat() const { 103 return mFormat; 104 } 105 getOffset(uint16_t x,uint16_t y)106 inline uint32_t getOffset(uint16_t x, uint16_t y) const { 107 return (y * getWidth() + x) * PixelBuffer::formatSize(mFormat); 108 } 109 getDirtyRect()110 inline const Rect* getDirtyRect() const { 111 return &mDirtyRect; 112 } 113 getPixelBuffer()114 inline PixelBuffer* getPixelBuffer() const { 115 return mPixelBuffer; 116 } 117 getTexture()118 Texture& getTexture() { 119 allocatePixelBuffer(); 120 return mTexture; 121 } 122 getTextureId()123 GLuint getTextureId() { 124 allocatePixelBuffer(); 125 return mTexture.id(); 126 } 127 isDirty()128 inline bool isDirty() const { 129 return mDirty; 130 } 131 getLinearFiltering()132 inline bool getLinearFiltering() const { 133 return mLinearFiltering; 134 } 135 136 /** 137 * This method assumes that the proper texture unit is active. 138 */ 139 void setLinearFiltering(bool linearFiltering); 140 getGlyphCount()141 inline uint16_t getGlyphCount() const { 142 return mNumGlyphs; 143 } 144 mesh()145 TextureVertex* mesh() const { 146 return mMesh; 147 } 148 meshElementCount()149 uint32_t meshElementCount() const { 150 return mCurrentQuad * 6; 151 } 152 indices()153 uint16_t* indices() const { 154 return (uint16_t*) nullptr; 155 } 156 resetMesh()157 void resetMesh() { 158 mCurrentQuad = 0; 159 } 160 addQuad(float x1,float y1,float u1,float v1,float x2,float y2,float u2,float v2,float x3,float y3,float u3,float v3,float x4,float y4,float u4,float v4)161 inline void addQuad(float x1, float y1, float u1, float v1, 162 float x2, float y2, float u2, float v2, 163 float x3, float y3, float u3, float v3, 164 float x4, float y4, float u4, float v4) { 165 TextureVertex* mesh = mMesh + mCurrentQuad * 4; 166 TextureVertex::set(mesh++, x2, y2, u2, v2); 167 TextureVertex::set(mesh++, x3, y3, u3, v3); 168 TextureVertex::set(mesh++, x1, y1, u1, v1); 169 TextureVertex::set(mesh++, x4, y4, u4, v4); 170 mCurrentQuad++; 171 } 172 canDraw()173 bool canDraw() const { 174 return mCurrentQuad > 0; 175 } 176 endOfMesh()177 bool endOfMesh() const { 178 return mCurrentQuad == mMaxQuadCount; 179 } 180 181 private: 182 void setDirty(bool dirty); 183 184 PixelBuffer* mPixelBuffer = nullptr; 185 Texture mTexture; 186 uint32_t mWidth, mHeight; 187 GLenum mFormat; 188 bool mLinearFiltering = false; 189 bool mDirty = false; 190 uint16_t mNumGlyphs = 0; 191 TextureVertex* mMesh = nullptr; 192 uint32_t mCurrentQuad = 0; 193 uint32_t mMaxQuadCount; 194 Caches& mCaches; 195 CacheBlock* mCacheBlocks; 196 bool mHasUnpackRowLength; 197 Rect mDirtyRect; 198 }; 199 200 }; // namespace uirenderer 201 }; // namespace android 202 203 #endif // ANDROID_HWUI_CACHE_TEXTURE_H 204