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 26namespace android { 27namespace 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 */ 38CacheBlock* 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 82CacheBlock* 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 112CacheTexture::CacheTexture(uint16_t width, uint16_t height, GLenum format, uint32_t maxQuadCount) 113 : mTexture(Caches::getInstance()) 114 , mWidth(width) 115 , mHeight(height) 116 , mFormat(format) 117 , mMaxQuadCount(maxQuadCount) 118 , mCaches(Caches::getInstance()) { 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 130CacheTexture::~CacheTexture() { 131 releaseMesh(); 132 releasePixelBuffer(); 133 reset(); 134} 135 136void 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 147void 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 154void CacheTexture::releaseMesh() { 155 delete[] mMesh; 156} 157 158void CacheTexture::releasePixelBuffer() { 159 if (mPixelBuffer) { 160 delete mPixelBuffer; 161 mPixelBuffer = nullptr; 162 } 163 mTexture.deleteTexture(); 164 mDirty = false; 165 mCurrentQuad = 0; 166} 167 168void CacheTexture::setLinearFiltering(bool linearFiltering) { 169 mTexture.setFilter(linearFiltering ? GL_LINEAR : GL_NEAREST); 170} 171 172void CacheTexture::allocateMesh() { 173 if (!mMesh) { 174 mMesh = new TextureVertex[mMaxQuadCount * 4]; 175 } 176} 177 178void CacheTexture::allocatePixelBuffer() { 179 if (!mPixelBuffer) { 180 mPixelBuffer = PixelBuffer::create(mFormat, getWidth(), getHeight()); 181 } 182 183 mTexture.resize(mWidth, mHeight, mFormat); 184 mTexture.setFilter(getLinearFiltering() ? GL_LINEAR : GL_NEAREST); 185 mTexture.setWrap(GL_CLAMP_TO_EDGE); 186} 187 188bool CacheTexture::upload() { 189 const Rect& dirtyRect = mDirtyRect; 190 191 uint32_t x = mHasUnpackRowLength ? dirtyRect.left : 0; 192 uint32_t y = dirtyRect.top; 193 uint32_t width = mHasUnpackRowLength ? dirtyRect.getWidth() : getWidth(); 194 uint32_t height = dirtyRect.getHeight(); 195 196 // The unpack row length only needs to be specified when a new 197 // texture is bound 198 if (mHasUnpackRowLength) { 199 glPixelStorei(GL_UNPACK_ROW_LENGTH, getWidth()); 200 } 201 202 mPixelBuffer->upload(x, y, width, height); 203 setDirty(false); 204 205 return mHasUnpackRowLength; 206} 207 208void CacheTexture::setDirty(bool dirty) { 209 mDirty = dirty; 210 if (!dirty) { 211 mDirtyRect.setEmpty(); 212 } 213} 214 215bool CacheTexture::fitBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY) { 216 switch (glyph.fMaskFormat) { 217 case SkMask::kA8_Format: 218 case SkMask::kBW_Format: 219 if (mFormat != GL_ALPHA) { 220#if DEBUG_FONT_RENDERER 221 ALOGD("fitBitmap: texture format %x is inappropriate for monochromatic glyphs", 222 mFormat); 223#endif 224 return false; 225 } 226 break; 227 case SkMask::kARGB32_Format: 228 if (mFormat != GL_RGBA) { 229#if DEBUG_FONT_RENDERER 230 ALOGD("fitBitmap: texture format %x is inappropriate for colour glyphs", mFormat); 231#endif 232 return false; 233 } 234 break; 235 default: 236#if DEBUG_FONT_RENDERER 237 ALOGD("fitBitmap: unknown glyph format %x encountered", glyph.fMaskFormat); 238#endif 239 return false; 240 } 241 242 if (glyph.fHeight + TEXTURE_BORDER_SIZE * 2 > getHeight()) { 243 return false; 244 } 245 246 uint16_t glyphW = glyph.fWidth + TEXTURE_BORDER_SIZE; 247 uint16_t glyphH = glyph.fHeight + TEXTURE_BORDER_SIZE; 248 249 // roundedUpW equals glyphW to the next multiple of CACHE_BLOCK_ROUNDING_SIZE. 250 // This columns for glyphs that are close but not necessarily exactly the same size. It trades 251 // off the loss of a few pixels for some glyphs against the ability to store more glyphs 252 // of varying sizes in one block. 253 uint16_t roundedUpW = (glyphW + CACHE_BLOCK_ROUNDING_SIZE - 1) & -CACHE_BLOCK_ROUNDING_SIZE; 254 255 CacheBlock* cacheBlock = mCacheBlocks; 256 while (cacheBlock) { 257 // Store glyph in this block iff: it fits the block's remaining space and: 258 // it's the remainder space (mY == 0) or there's only enough height for this one glyph 259 // or it's within ROUNDING_SIZE of the block width 260 if (roundedUpW <= cacheBlock->mWidth && glyphH <= cacheBlock->mHeight && 261 (cacheBlock->mY == TEXTURE_BORDER_SIZE || 262 (cacheBlock->mWidth - roundedUpW < CACHE_BLOCK_ROUNDING_SIZE))) { 263 if (cacheBlock->mHeight - glyphH < glyphH) { 264 // Only enough space for this glyph - don't bother rounding up the width 265 roundedUpW = glyphW; 266 } 267 268 *retOriginX = cacheBlock->mX; 269 *retOriginY = cacheBlock->mY; 270 271 // If this is the remainder space, create a new cache block for this column. Otherwise, 272 // adjust the info about this column. 273 if (cacheBlock->mY == TEXTURE_BORDER_SIZE) { 274 uint16_t oldX = cacheBlock->mX; 275 // Adjust remainder space dimensions 276 cacheBlock->mWidth -= roundedUpW; 277 cacheBlock->mX += roundedUpW; 278 279 if (getHeight() - glyphH >= glyphH) { 280 // There's enough height left over to create a new CacheBlock 281 CacheBlock* newBlock = new CacheBlock(oldX, glyphH + TEXTURE_BORDER_SIZE, 282 roundedUpW, getHeight() - glyphH - TEXTURE_BORDER_SIZE); 283#if DEBUG_FONT_RENDERER 284 ALOGD("fitBitmap: Created new block: this, x, y, w, h = %p, %d, %d, %d, %d", 285 newBlock, newBlock->mX, newBlock->mY, 286 newBlock->mWidth, newBlock->mHeight); 287#endif 288 mCacheBlocks = CacheBlock::insertBlock(mCacheBlocks, newBlock); 289 } 290 } else { 291 // Insert into current column and adjust column dimensions 292 cacheBlock->mY += glyphH; 293 cacheBlock->mHeight -= glyphH; 294#if DEBUG_FONT_RENDERER 295 ALOGD("fitBitmap: Added to existing block: this, x, y, w, h = %p, %d, %d, %d, %d", 296 cacheBlock, cacheBlock->mX, cacheBlock->mY, 297 cacheBlock->mWidth, cacheBlock->mHeight); 298#endif 299 } 300 301 if (cacheBlock->mHeight < std::min(glyphH, glyphW)) { 302 // If remaining space in this block is too small to be useful, remove it 303 mCacheBlocks = CacheBlock::removeBlock(mCacheBlocks, cacheBlock); 304 } 305 306 mDirty = true; 307 const Rect r(*retOriginX - TEXTURE_BORDER_SIZE, *retOriginY - TEXTURE_BORDER_SIZE, 308 *retOriginX + glyphW, *retOriginY + glyphH); 309 mDirtyRect.unionWith(r); 310 mNumGlyphs++; 311 312#if DEBUG_FONT_RENDERER 313 ALOGD("fitBitmap: current block list:"); 314 mCacheBlocks->output(); 315#endif 316 317 return true; 318 } 319 cacheBlock = cacheBlock->mNext; 320 } 321#if DEBUG_FONT_RENDERER 322 ALOGD("fitBitmap: returning false for glyph of size %d, %d", glyphW, glyphH); 323#endif 324 return false; 325} 326 327uint32_t CacheTexture::calculateFreeMemory() const { 328 CacheBlock* cacheBlock = mCacheBlocks; 329 uint32_t free = 0; 330 // currently only two formats are supported: GL_ALPHA or GL_RGBA; 331 uint32_t bpp = mFormat == GL_RGBA ? 4 : 1; 332 while (cacheBlock) { 333 free += bpp * cacheBlock->mWidth * cacheBlock->mHeight; 334 cacheBlock = cacheBlock->mNext; 335 } 336 return free; 337} 338 339}; // namespace uirenderer 340}; // namespace android 341