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 #include <SkGlyph.h> 18 19 #include "CacheTexture.h" 20 #include "FontUtil.h" 21 #include "../Caches.h" 22 #include "../Debug.h" 23 #include "../Extensions.h" 24 #include "../PixelBuffer.h" 25 26 namespace android { 27 namespace uirenderer { 28 29 /////////////////////////////////////////////////////////////////////////////// 30 // CacheBlock 31 /////////////////////////////////////////////////////////////////////////////// 32 33 /** 34 * Insert new block into existing linked list of blocks. Blocks are sorted in increasing-width 35 * order, except for the final block (the remainder space at the right, since we fill from the 36 * left). 37 */ 38 CacheBlock* CacheBlock::insertBlock(CacheBlock* head, CacheBlock* newBlock) { 39 #if DEBUG_FONT_RENDERER 40 ALOGD("insertBlock: this, x, y, w, h = %p, %d, %d, %d, %d", 41 newBlock, newBlock->mX, newBlock->mY, 42 newBlock->mWidth, newBlock->mHeight); 43 #endif 44 45 CacheBlock* currBlock = head; 46 CacheBlock* prevBlock = nullptr; 47 48 while (currBlock && currBlock->mY != TEXTURE_BORDER_SIZE) { 49 if (newBlock->mWidth < currBlock->mWidth) { 50 newBlock->mNext = currBlock; 51 newBlock->mPrev = prevBlock; 52 currBlock->mPrev = newBlock; 53 54 if (prevBlock) { 55 prevBlock->mNext = newBlock; 56 return head; 57 } else { 58 return newBlock; 59 } 60 } 61 62 prevBlock = currBlock; 63 currBlock = currBlock->mNext; 64 } 65 66 // new block larger than all others - insert at end (but before the remainder space, if there) 67 newBlock->mNext = currBlock; 68 newBlock->mPrev = prevBlock; 69 70 if (currBlock) { 71 currBlock->mPrev = newBlock; 72 } 73 74 if (prevBlock) { 75 prevBlock->mNext = newBlock; 76 return head; 77 } else { 78 return newBlock; 79 } 80 } 81 82 CacheBlock* CacheBlock::removeBlock(CacheBlock* head, CacheBlock* blockToRemove) { 83 #if DEBUG_FONT_RENDERER 84 ALOGD("removeBlock: this, x, y, w, h = %p, %d, %d, %d, %d", 85 blockToRemove, blockToRemove->mX, blockToRemove->mY, 86 blockToRemove->mWidth, blockToRemove->mHeight); 87 #endif 88 89 CacheBlock* newHead = head; 90 CacheBlock* nextBlock = blockToRemove->mNext; 91 CacheBlock* prevBlock = blockToRemove->mPrev; 92 93 if (prevBlock) { 94 prevBlock->mNext = nextBlock; 95 } else { 96 newHead = nextBlock; 97 } 98 99 if (nextBlock) { 100 nextBlock->mPrev = prevBlock; 101 } 102 103 delete blockToRemove; 104 105 return newHead; 106 } 107 108 /////////////////////////////////////////////////////////////////////////////// 109 // CacheTexture 110 /////////////////////////////////////////////////////////////////////////////// 111 112 CacheTexture::CacheTexture(uint16_t width, uint16_t height, GLenum format, uint32_t maxQuadCount) 113 : mTexture(Caches::getInstance()) 114 , mFormat(format) 115 , mMaxQuadCount(maxQuadCount) 116 , mCaches(Caches::getInstance()) { 117 mTexture.width = width; 118 mTexture.height = height; 119 mTexture.blend = true; 120 121 mCacheBlocks = new CacheBlock(TEXTURE_BORDER_SIZE, TEXTURE_BORDER_SIZE, 122 getWidth() - TEXTURE_BORDER_SIZE, getHeight() - TEXTURE_BORDER_SIZE); 123 124 // OpenGL ES 3.0+ lets us specify the row length for unpack operations such 125 // as glTexSubImage2D(). This allows us to upload a sub-rectangle of a texture. 126 // With OpenGL ES 2.0 we have to upload entire stripes instead. 127 mHasUnpackRowLength = mCaches.extensions().hasUnpackRowLength(); 128 } 129 130 CacheTexture::~CacheTexture() { 131 releaseMesh(); 132 releasePixelBuffer(); 133 reset(); 134 } 135 136 void CacheTexture::reset() { 137 // Delete existing cache blocks 138 while (mCacheBlocks != nullptr) { 139 CacheBlock* tmpBlock = mCacheBlocks; 140 mCacheBlocks = mCacheBlocks->mNext; 141 delete tmpBlock; 142 } 143 mNumGlyphs = 0; 144 mCurrentQuad = 0; 145 } 146 147 void CacheTexture::init() { 148 // reset, then create a new remainder space to start again 149 reset(); 150 mCacheBlocks = new CacheBlock(TEXTURE_BORDER_SIZE, TEXTURE_BORDER_SIZE, 151 getWidth() - TEXTURE_BORDER_SIZE, getHeight() - TEXTURE_BORDER_SIZE); 152 } 153 154 void CacheTexture::releaseMesh() { 155 delete[] mMesh; 156 } 157 158 void CacheTexture::releasePixelBuffer() { 159 if (mPixelBuffer) { 160 delete mPixelBuffer; 161 mPixelBuffer = nullptr; 162 } 163 if (mTexture.id) { 164 mCaches.textureState().deleteTexture(mTexture.id); 165 mTexture.id = 0; 166 } 167 mDirty = false; 168 mCurrentQuad = 0; 169 } 170 171 void CacheTexture::setLinearFiltering(bool linearFiltering) { 172 mTexture.setFilter(linearFiltering ? GL_LINEAR : GL_NEAREST); 173 } 174 175 void CacheTexture::allocateMesh() { 176 if (!mMesh) { 177 mMesh = new TextureVertex[mMaxQuadCount * 4]; 178 } 179 } 180 181 void CacheTexture::allocatePixelBuffer() { 182 if (!mPixelBuffer) { 183 mPixelBuffer = PixelBuffer::create(mFormat, getWidth(), getHeight()); 184 } 185 186 if (!mTexture.id) { 187 glGenTextures(1, &mTexture.id); 188 189 mCaches.textureState().bindTexture(mTexture.id); 190 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 191 // Initialize texture dimensions 192 glTexImage2D(GL_TEXTURE_2D, 0, mFormat, getWidth(), getHeight(), 0, 193 mFormat, GL_UNSIGNED_BYTE, nullptr); 194 195 const GLenum filtering = getLinearFiltering() ? GL_LINEAR : GL_NEAREST; 196 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering); 197 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filtering); 198 199 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 200 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 201 } 202 } 203 204 bool CacheTexture::upload() { 205 const Rect& dirtyRect = mDirtyRect; 206 207 uint32_t x = mHasUnpackRowLength ? dirtyRect.left : 0; 208 uint32_t y = dirtyRect.top; 209 uint32_t width = mHasUnpackRowLength ? dirtyRect.getWidth() : getWidth(); 210 uint32_t height = dirtyRect.getHeight(); 211 212 // The unpack row length only needs to be specified when a new 213 // texture is bound 214 if (mHasUnpackRowLength) { 215 glPixelStorei(GL_UNPACK_ROW_LENGTH, getWidth()); 216 } 217 218 mPixelBuffer->upload(x, y, width, height); 219 setDirty(false); 220 221 return mHasUnpackRowLength; 222 } 223 224 void CacheTexture::setDirty(bool dirty) { 225 mDirty = dirty; 226 if (!dirty) { 227 mDirtyRect.setEmpty(); 228 } 229 } 230 231 bool CacheTexture::fitBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY) { 232 switch (glyph.fMaskFormat) { 233 case SkMask::kA8_Format: 234 case SkMask::kBW_Format: 235 if (mFormat != GL_ALPHA) { 236 #if DEBUG_FONT_RENDERER 237 ALOGD("fitBitmap: texture format %x is inappropriate for monochromatic glyphs", 238 mFormat); 239 #endif 240 return false; 241 } 242 break; 243 case SkMask::kARGB32_Format: 244 if (mFormat != GL_RGBA) { 245 #if DEBUG_FONT_RENDERER 246 ALOGD("fitBitmap: texture format %x is inappropriate for colour glyphs", mFormat); 247 #endif 248 return false; 249 } 250 break; 251 default: 252 #if DEBUG_FONT_RENDERER 253 ALOGD("fitBitmap: unknown glyph format %x encountered", glyph.fMaskFormat); 254 #endif 255 return false; 256 } 257 258 if (glyph.fHeight + TEXTURE_BORDER_SIZE * 2 > getHeight()) { 259 return false; 260 } 261 262 uint16_t glyphW = glyph.fWidth + TEXTURE_BORDER_SIZE; 263 uint16_t glyphH = glyph.fHeight + TEXTURE_BORDER_SIZE; 264 265 // roundedUpW equals glyphW to the next multiple of CACHE_BLOCK_ROUNDING_SIZE. 266 // This columns for glyphs that are close but not necessarily exactly the same size. It trades 267 // off the loss of a few pixels for some glyphs against the ability to store more glyphs 268 // of varying sizes in one block. 269 uint16_t roundedUpW = (glyphW + CACHE_BLOCK_ROUNDING_SIZE - 1) & -CACHE_BLOCK_ROUNDING_SIZE; 270 271 CacheBlock* cacheBlock = mCacheBlocks; 272 while (cacheBlock) { 273 // Store glyph in this block iff: it fits the block's remaining space and: 274 // it's the remainder space (mY == 0) or there's only enough height for this one glyph 275 // or it's within ROUNDING_SIZE of the block width 276 if (roundedUpW <= cacheBlock->mWidth && glyphH <= cacheBlock->mHeight && 277 (cacheBlock->mY == TEXTURE_BORDER_SIZE || 278 (cacheBlock->mWidth - roundedUpW < CACHE_BLOCK_ROUNDING_SIZE))) { 279 if (cacheBlock->mHeight - glyphH < glyphH) { 280 // Only enough space for this glyph - don't bother rounding up the width 281 roundedUpW = glyphW; 282 } 283 284 *retOriginX = cacheBlock->mX; 285 *retOriginY = cacheBlock->mY; 286 287 // If this is the remainder space, create a new cache block for this column. Otherwise, 288 // adjust the info about this column. 289 if (cacheBlock->mY == TEXTURE_BORDER_SIZE) { 290 uint16_t oldX = cacheBlock->mX; 291 // Adjust remainder space dimensions 292 cacheBlock->mWidth -= roundedUpW; 293 cacheBlock->mX += roundedUpW; 294 295 if (getHeight() - glyphH >= glyphH) { 296 // There's enough height left over to create a new CacheBlock 297 CacheBlock* newBlock = new CacheBlock(oldX, glyphH + TEXTURE_BORDER_SIZE, 298 roundedUpW, getHeight() - glyphH - TEXTURE_BORDER_SIZE); 299 #if DEBUG_FONT_RENDERER 300 ALOGD("fitBitmap: Created new block: this, x, y, w, h = %p, %d, %d, %d, %d", 301 newBlock, newBlock->mX, newBlock->mY, 302 newBlock->mWidth, newBlock->mHeight); 303 #endif 304 mCacheBlocks = CacheBlock::insertBlock(mCacheBlocks, newBlock); 305 } 306 } else { 307 // Insert into current column and adjust column dimensions 308 cacheBlock->mY += glyphH; 309 cacheBlock->mHeight -= glyphH; 310 #if DEBUG_FONT_RENDERER 311 ALOGD("fitBitmap: Added to existing block: this, x, y, w, h = %p, %d, %d, %d, %d", 312 cacheBlock, cacheBlock->mX, cacheBlock->mY, 313 cacheBlock->mWidth, cacheBlock->mHeight); 314 #endif 315 } 316 317 if (cacheBlock->mHeight < std::min(glyphH, glyphW)) { 318 // If remaining space in this block is too small to be useful, remove it 319 mCacheBlocks = CacheBlock::removeBlock(mCacheBlocks, cacheBlock); 320 } 321 322 mDirty = true; 323 const Rect r(*retOriginX - TEXTURE_BORDER_SIZE, *retOriginY - TEXTURE_BORDER_SIZE, 324 *retOriginX + glyphW, *retOriginY + glyphH); 325 mDirtyRect.unionWith(r); 326 mNumGlyphs++; 327 328 #if DEBUG_FONT_RENDERER 329 ALOGD("fitBitmap: current block list:"); 330 mCacheBlocks->output(); 331 #endif 332 333 return true; 334 } 335 cacheBlock = cacheBlock->mNext; 336 } 337 #if DEBUG_FONT_RENDERER 338 ALOGD("fitBitmap: returning false for glyph of size %d, %d", glyphW, glyphH); 339 #endif 340 return false; 341 } 342 343 }; // namespace uirenderer 344 }; // namespace android 345