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 GLint internalFormat = mFormat; 184 if (mFormat == GL_RGBA) { 185 internalFormat = mCaches.rgbaInternalFormat(); 186 } 187 188 mTexture.resize(mWidth, mHeight, internalFormat, mFormat); 189 mTexture.setFilter(getLinearFiltering() ? GL_LINEAR : GL_NEAREST); 190 mTexture.setWrap(GL_CLAMP_TO_EDGE); 191} 192 193bool CacheTexture::upload() { 194 const Rect& dirtyRect = mDirtyRect; 195 196 // align the x direction to 32 and y direction to 4 for better performance 197 uint32_t x = (((uint32_t)dirtyRect.left) & (~0x1F)); 198 uint32_t y = (((uint32_t)dirtyRect.top) & (~0x3)); 199 uint32_t r = ((((uint32_t)dirtyRect.right) + 0x1F) & (~0x1F)) - x; 200 uint32_t b = ((((uint32_t)dirtyRect.bottom) + 0x3) & (~0x3)) - y; 201 uint32_t width = (r > getWidth() ? getWidth() : r); 202 uint32_t height = (b > getHeight() ? getHeight() : b); 203 204 // The unpack row length only needs to be specified when a new 205 // texture is bound 206 if (mHasUnpackRowLength) { 207 glPixelStorei(GL_UNPACK_ROW_LENGTH, getWidth()); 208 } else { 209 x = 0; 210 width = getWidth(); 211 } 212 213 mPixelBuffer->upload(x, y, width, height); 214 setDirty(false); 215 216 return mHasUnpackRowLength; 217} 218 219void CacheTexture::setDirty(bool dirty) { 220 mDirty = dirty; 221 if (!dirty) { 222 mDirtyRect.setEmpty(); 223 } 224} 225 226bool CacheTexture::fitBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY) { 227 switch (glyph.fMaskFormat) { 228 case SkMask::kA8_Format: 229 case SkMask::kBW_Format: 230 if (mFormat != GL_ALPHA) { 231#if DEBUG_FONT_RENDERER 232 ALOGD("fitBitmap: texture format %x is inappropriate for monochromatic glyphs", 233 mFormat); 234#endif 235 return false; 236 } 237 break; 238 case SkMask::kARGB32_Format: 239 if (mFormat != GL_RGBA) { 240#if DEBUG_FONT_RENDERER 241 ALOGD("fitBitmap: texture format %x is inappropriate for colour glyphs", mFormat); 242#endif 243 return false; 244 } 245 break; 246 default: 247#if DEBUG_FONT_RENDERER 248 ALOGD("fitBitmap: unknown glyph format %x encountered", glyph.fMaskFormat); 249#endif 250 return false; 251 } 252 253 if (glyph.fHeight + TEXTURE_BORDER_SIZE * 2 > getHeight()) { 254 return false; 255 } 256 257 uint16_t glyphW = glyph.fWidth + TEXTURE_BORDER_SIZE; 258 uint16_t glyphH = glyph.fHeight + TEXTURE_BORDER_SIZE; 259 260 // roundedUpW equals glyphW to the next multiple of CACHE_BLOCK_ROUNDING_SIZE. 261 // This columns for glyphs that are close but not necessarily exactly the same size. It trades 262 // off the loss of a few pixels for some glyphs against the ability to store more glyphs 263 // of varying sizes in one block. 264 uint16_t roundedUpW = (glyphW + CACHE_BLOCK_ROUNDING_SIZE - 1) & -CACHE_BLOCK_ROUNDING_SIZE; 265 266 CacheBlock* cacheBlock = mCacheBlocks; 267 while (cacheBlock) { 268 // Store glyph in this block iff: it fits the block's remaining space and: 269 // it's the remainder space (mY == 0) or there's only enough height for this one glyph 270 // or it's within ROUNDING_SIZE of the block width 271 if (roundedUpW <= cacheBlock->mWidth && glyphH <= cacheBlock->mHeight && 272 (cacheBlock->mY == TEXTURE_BORDER_SIZE || 273 (cacheBlock->mWidth - roundedUpW < CACHE_BLOCK_ROUNDING_SIZE))) { 274 if (cacheBlock->mHeight - glyphH < glyphH) { 275 // Only enough space for this glyph - don't bother rounding up the width 276 roundedUpW = glyphW; 277 } 278 279 *retOriginX = cacheBlock->mX; 280 *retOriginY = cacheBlock->mY; 281 282 // If this is the remainder space, create a new cache block for this column. Otherwise, 283 // adjust the info about this column. 284 if (cacheBlock->mY == TEXTURE_BORDER_SIZE) { 285 uint16_t oldX = cacheBlock->mX; 286 // Adjust remainder space dimensions 287 cacheBlock->mWidth -= roundedUpW; 288 cacheBlock->mX += roundedUpW; 289 290 if (getHeight() - glyphH >= glyphH) { 291 // There's enough height left over to create a new CacheBlock 292 CacheBlock* newBlock = new CacheBlock(oldX, glyphH + TEXTURE_BORDER_SIZE, 293 roundedUpW, getHeight() - glyphH - TEXTURE_BORDER_SIZE); 294#if DEBUG_FONT_RENDERER 295 ALOGD("fitBitmap: Created new block: this, x, y, w, h = %p, %d, %d, %d, %d", 296 newBlock, newBlock->mX, newBlock->mY, 297 newBlock->mWidth, newBlock->mHeight); 298#endif 299 mCacheBlocks = CacheBlock::insertBlock(mCacheBlocks, newBlock); 300 } 301 } else { 302 // Insert into current column and adjust column dimensions 303 cacheBlock->mY += glyphH; 304 cacheBlock->mHeight -= glyphH; 305#if DEBUG_FONT_RENDERER 306 ALOGD("fitBitmap: Added to existing block: this, x, y, w, h = %p, %d, %d, %d, %d", 307 cacheBlock, cacheBlock->mX, cacheBlock->mY, 308 cacheBlock->mWidth, cacheBlock->mHeight); 309#endif 310 } 311 312 if (cacheBlock->mHeight < std::min(glyphH, glyphW)) { 313 // If remaining space in this block is too small to be useful, remove it 314 mCacheBlocks = CacheBlock::removeBlock(mCacheBlocks, cacheBlock); 315 } 316 317 mDirty = true; 318 const Rect r(*retOriginX - TEXTURE_BORDER_SIZE, *retOriginY - TEXTURE_BORDER_SIZE, 319 *retOriginX + glyphW, *retOriginY + glyphH); 320 mDirtyRect.unionWith(r); 321 mNumGlyphs++; 322 323#if DEBUG_FONT_RENDERER 324 ALOGD("fitBitmap: current block list:"); 325 mCacheBlocks->output(); 326#endif 327 328 return true; 329 } 330 cacheBlock = cacheBlock->mNext; 331 } 332#if DEBUG_FONT_RENDERER 333 ALOGD("fitBitmap: returning false for glyph of size %d, %d", glyphW, glyphH); 334#endif 335 return false; 336} 337 338uint32_t CacheTexture::calculateFreeMemory() const { 339 CacheBlock* cacheBlock = mCacheBlocks; 340 uint32_t free = 0; 341 // currently only two formats are supported: GL_ALPHA or GL_RGBA; 342 uint32_t bpp = mFormat == GL_RGBA ? 4 : 1; 343 while (cacheBlock) { 344 free += bpp * cacheBlock->mWidth * cacheBlock->mHeight; 345 cacheBlock = cacheBlock->mNext; 346 } 347 return free; 348} 349 350}; // namespace uirenderer 351}; // namespace android 352