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| 1 /* | |
| 2 * Copyright (C) 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y | |
| 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N | |
| 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 23 */ | |
| 24 | |
| 25 #include "config.h" | |
| 26 #include "platform/fonts/mac/ComplexTextController.h" | |
| 27 | |
| 28 #include "platform/fonts/Character.h" | |
| 29 #include "platform/fonts/Font.h" | |
| 30 #include "platform/fonts/GlyphBuffer.h" | |
| 31 #include "platform/geometry/FloatSize.h" | |
| 32 #include "platform/text/TextBreakIterator.h" | |
| 33 #include "platform/text/TextRun.h" | |
| 34 #include "wtf/StdLibExtras.h" | |
| 35 #include "wtf/unicode/CharacterNames.h" | |
| 36 #include <ApplicationServices/ApplicationServices.h> | |
| 37 | |
| 38 namespace blink { | |
| 39 | |
| 40 ComplexTextController::ComplexTextController(const Font* font, const TextRun& ru
n, bool mayUseNaturalWritingDirection, HashSet<const SimpleFontData*>* fallbackF
onts, bool forTextEmphasis) | |
| 41 : m_font(*font) | |
| 42 , m_run(run) | |
| 43 , m_isLTROnly(true) | |
| 44 , m_mayUseNaturalWritingDirection(mayUseNaturalWritingDirection) | |
| 45 , m_forTextEmphasis(forTextEmphasis) | |
| 46 , m_currentCharacter(0) | |
| 47 , m_end(run.length()) | |
| 48 , m_totalWidth(0) | |
| 49 , m_runWidthSoFar(0) | |
| 50 , m_numGlyphsSoFar(0) | |
| 51 , m_currentRun(0) | |
| 52 , m_glyphInCurrentRun(0) | |
| 53 , m_characterInCurrentGlyph(0) | |
| 54 , m_expansion(run.expansion()) | |
| 55 , m_leadingExpansion(0) | |
| 56 , m_afterExpansion(!run.allowsLeadingExpansion()) | |
| 57 , m_fallbackFonts(fallbackFonts) | |
| 58 , m_minGlyphBoundingBoxX(std::numeric_limits<float>::max()) | |
| 59 , m_maxGlyphBoundingBoxX(std::numeric_limits<float>::min()) | |
| 60 , m_minGlyphBoundingBoxY(std::numeric_limits<float>::max()) | |
| 61 , m_maxGlyphBoundingBoxY(std::numeric_limits<float>::min()) | |
| 62 { | |
| 63 if (!m_expansion) | |
| 64 m_expansionPerOpportunity = 0; | |
| 65 else { | |
| 66 bool isAfterExpansion = m_afterExpansion; | |
| 67 unsigned expansionOpportunityCount; | |
| 68 if (m_run.is8Bit()) | |
| 69 expansionOpportunityCount = Character::expansionOpportunityCount(m_r
un.characters8(), m_end, m_run.direction(), isAfterExpansion); | |
| 70 else | |
| 71 expansionOpportunityCount = Character::expansionOpportunityCount(m_r
un.characters16(), m_end, m_run.direction(), isAfterExpansion); | |
| 72 if (isAfterExpansion && !m_run.allowsTrailingExpansion()) | |
| 73 expansionOpportunityCount--; | |
| 74 | |
| 75 if (!expansionOpportunityCount) | |
| 76 m_expansionPerOpportunity = 0; | |
| 77 else | |
| 78 m_expansionPerOpportunity = m_expansion / expansionOpportunityCount; | |
| 79 } | |
| 80 | |
| 81 collectComplexTextRuns(); | |
| 82 adjustGlyphsAndAdvances(); | |
| 83 | |
| 84 if (!m_isLTROnly) { | |
| 85 m_runIndices.reserveInitialCapacity(m_complexTextRuns.size()); | |
| 86 | |
| 87 m_glyphCountFromStartToIndex.reserveInitialCapacity(m_complexTextRuns.si
ze()); | |
| 88 unsigned glyphCountSoFar = 0; | |
| 89 for (unsigned i = 0; i < m_complexTextRuns.size(); ++i) { | |
| 90 m_glyphCountFromStartToIndex.uncheckedAppend(glyphCountSoFar); | |
| 91 glyphCountSoFar += m_complexTextRuns[i]->glyphCount(); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 m_runWidthSoFar = m_leadingExpansion; | |
| 96 } | |
| 97 | |
| 98 int ComplexTextController::offsetForPosition(float h, bool includePartialGlyphs) | |
| 99 { | |
| 100 if (h >= m_totalWidth) | |
| 101 return m_run.ltr() ? m_end : 0; | |
| 102 | |
| 103 h -= m_leadingExpansion; | |
| 104 if (h < 0) | |
| 105 return m_run.ltr() ? 0 : m_end; | |
| 106 | |
| 107 CGFloat x = h; | |
| 108 | |
| 109 size_t runCount = m_complexTextRuns.size(); | |
| 110 size_t offsetIntoAdjustedGlyphs = 0; | |
| 111 | |
| 112 for (size_t r = 0; r < runCount; ++r) { | |
| 113 const ComplexTextRun& complexTextRun = *m_complexTextRuns[r]; | |
| 114 for (unsigned j = 0; j < complexTextRun.glyphCount(); ++j) { | |
| 115 CGFloat adjustedAdvance = m_adjustedAdvances[offsetIntoAdjustedGlyph
s + j].width; | |
| 116 if (x < adjustedAdvance) { | |
| 117 CFIndex hitGlyphStart = complexTextRun.indexAt(j); | |
| 118 CFIndex hitGlyphEnd; | |
| 119 if (m_run.ltr()) | |
| 120 hitGlyphEnd = std::max<CFIndex>(hitGlyphStart, j + 1 < compl
exTextRun.glyphCount() ? complexTextRun.indexAt(j + 1) : static_cast<CFIndex>(co
mplexTextRun.indexEnd())); | |
| 121 else | |
| 122 hitGlyphEnd = std::max<CFIndex>(hitGlyphStart, j > 0 ? compl
exTextRun.indexAt(j - 1) : static_cast<CFIndex>(complexTextRun.indexEnd())); | |
| 123 | |
| 124 // FIXME: Instead of dividing the glyph's advance equally betwee
n the characters, this | |
| 125 // could use the glyph's "ligature carets". However, there is no
Core Text API to get the | |
| 126 // ligature carets. | |
| 127 CFIndex hitIndex = hitGlyphStart + (hitGlyphEnd - hitGlyphStart)
* (m_run.ltr() ? x / adjustedAdvance : 1 - x / adjustedAdvance); | |
| 128 int stringLength = complexTextRun.stringLength(); | |
| 129 TextBreakIterator* cursorPositionIterator = cursorMovementIterat
or(complexTextRun.characters(), stringLength); | |
| 130 int clusterStart; | |
| 131 if (cursorPositionIterator->isBoundary(hitIndex)) | |
| 132 clusterStart = hitIndex; | |
| 133 else { | |
| 134 clusterStart = cursorPositionIterator->preceding(hitIndex); | |
| 135 if (clusterStart == TextBreakDone) | |
| 136 clusterStart = 0; | |
| 137 } | |
| 138 | |
| 139 if (!includePartialGlyphs) | |
| 140 return complexTextRun.stringLocation() + clusterStart; | |
| 141 | |
| 142 int clusterEnd = cursorPositionIterator->following(hitIndex); | |
| 143 if (clusterEnd == TextBreakDone) | |
| 144 clusterEnd = stringLength; | |
| 145 | |
| 146 CGFloat clusterWidth; | |
| 147 // FIXME: The search stops at the boundaries of complexTextRun.
In theory, it should go on into neighboring ComplexTextRuns | |
| 148 // derived from the same CTLine. In practice, we do not expect t
here to be more than one CTRun in a CTLine, as no | |
| 149 // reordering and no font fallback should occur within a CTLine. | |
| 150 if (clusterEnd - clusterStart > 1) { | |
| 151 clusterWidth = adjustedAdvance; | |
| 152 int firstGlyphBeforeCluster = j - 1; | |
| 153 while (firstGlyphBeforeCluster >= 0 && complexTextRun.indexA
t(firstGlyphBeforeCluster) >= clusterStart && complexTextRun.indexAt(firstGlyphB
eforeCluster) < clusterEnd) { | |
| 154 CGFloat width = m_adjustedAdvances[offsetIntoAdjustedGly
phs + firstGlyphBeforeCluster].width; | |
| 155 clusterWidth += width; | |
| 156 x += width; | |
| 157 firstGlyphBeforeCluster--; | |
| 158 } | |
| 159 unsigned firstGlyphAfterCluster = j + 1; | |
| 160 while (firstGlyphAfterCluster < complexTextRun.glyphCount()
&& complexTextRun.indexAt(firstGlyphAfterCluster) >= clusterStart && complexText
Run.indexAt(firstGlyphAfterCluster) < clusterEnd) { | |
| 161 clusterWidth += m_adjustedAdvances[offsetIntoAdjustedGly
phs + firstGlyphAfterCluster].width; | |
| 162 firstGlyphAfterCluster++; | |
| 163 } | |
| 164 } else { | |
| 165 clusterWidth = adjustedAdvance / (hitGlyphEnd - hitGlyphStar
t); | |
| 166 x -= clusterWidth * (m_run.ltr() ? hitIndex - hitGlyphStart
: hitGlyphEnd - hitIndex - 1); | |
| 167 } | |
| 168 if (x <= clusterWidth / 2) | |
| 169 return complexTextRun.stringLocation() + (m_run.ltr() ? clus
terStart : clusterEnd); | |
| 170 else | |
| 171 return complexTextRun.stringLocation() + (m_run.ltr() ? clus
terEnd : clusterStart); | |
| 172 } | |
| 173 x -= adjustedAdvance; | |
| 174 } | |
| 175 offsetIntoAdjustedGlyphs += complexTextRun.glyphCount(); | |
| 176 } | |
| 177 | |
| 178 ASSERT_NOT_REACHED(); | |
| 179 return 0; | |
| 180 } | |
| 181 | |
| 182 static bool advanceByCombiningCharacterSequence(const UChar*& iterator, const UC
har* end, UChar32& baseCharacter, unsigned& markCount) | |
| 183 { | |
| 184 ASSERT(iterator < end); | |
| 185 | |
| 186 markCount = 0; | |
| 187 | |
| 188 baseCharacter = *iterator++; | |
| 189 | |
| 190 if (U16_IS_SURROGATE(baseCharacter)) { | |
| 191 if (!U16_IS_LEAD(baseCharacter)) | |
| 192 return false; | |
| 193 if (iterator == end) | |
| 194 return false; | |
| 195 UChar trail = *iterator++; | |
| 196 if (!U16_IS_TRAIL(trail)) | |
| 197 return false; | |
| 198 baseCharacter = U16_GET_SUPPLEMENTARY(baseCharacter, trail); | |
| 199 } | |
| 200 | |
| 201 // Consume marks. | |
| 202 while (iterator < end) { | |
| 203 UChar32 nextCharacter; | |
| 204 int markLength = 0; | |
| 205 U16_NEXT(iterator, markLength, end - iterator, nextCharacter); | |
| 206 if (!(U_GET_GC_MASK(nextCharacter) & U_GC_M_MASK)) | |
| 207 break; | |
| 208 markCount += markLength; | |
| 209 iterator += markLength; | |
| 210 } | |
| 211 | |
| 212 return true; | |
| 213 } | |
| 214 | |
| 215 void ComplexTextController::collectComplexTextRuns() | |
| 216 { | |
| 217 if (!m_end) | |
| 218 return; | |
| 219 | |
| 220 // We break up glyph run generation for the string by FontData. | |
| 221 const UChar* cp; | |
| 222 | |
| 223 if (m_run.is8Bit()) { | |
| 224 String stringFor8BitRun = String::make16BitFrom8BitSource(m_run.characte
rs8(), m_run.length()); | |
| 225 cp = stringFor8BitRun.characters16(); | |
| 226 m_stringsFor8BitRuns.append(stringFor8BitRun); | |
| 227 } else | |
| 228 cp = m_run.characters16(); | |
| 229 | |
| 230 if (m_font.fontDescription().variant() == FontVariantSmallCaps) | |
| 231 m_smallCapsBuffer.resize(m_end); | |
| 232 | |
| 233 unsigned indexOfFontTransition = 0; | |
| 234 const UChar* curr = cp; | |
| 235 const UChar* end = cp + m_end; | |
| 236 | |
| 237 const SimpleFontData* fontData; | |
| 238 bool isMissingGlyph; | |
| 239 const SimpleFontData* nextFontData; | |
| 240 bool nextIsMissingGlyph; | |
| 241 | |
| 242 unsigned markCount; | |
| 243 const UChar* sequenceStart = curr; | |
| 244 UChar32 baseCharacter; | |
| 245 if (!advanceByCombiningCharacterSequence(curr, end, baseCharacter, markCount
)) | |
| 246 return; | |
| 247 | |
| 248 UChar uppercaseCharacter = 0; | |
| 249 | |
| 250 bool isSmallCaps; | |
| 251 bool nextIsSmallCaps = m_font.fontDescription().variant() == FontVariantSmal
lCaps && !(U_GET_GC_MASK(baseCharacter) & U_GC_M_MASK) && (uppercaseCharacter =
u_toupper(baseCharacter)) != baseCharacter; | |
| 252 | |
| 253 if (nextIsSmallCaps) { | |
| 254 m_smallCapsBuffer[sequenceStart - cp] = uppercaseCharacter; | |
| 255 for (unsigned i = 0; i < markCount; ++i) | |
| 256 m_smallCapsBuffer[sequenceStart - cp + i + 1] = sequenceStart[i + 1]
; | |
| 257 } | |
| 258 | |
| 259 nextIsMissingGlyph = false; | |
| 260 nextFontData = m_font.fontDataForCombiningCharacterSequence(sequenceStart, c
urr - sequenceStart, nextIsSmallCaps ? SmallCapsVariant : NormalVariant); | |
| 261 if (!nextFontData) | |
| 262 nextIsMissingGlyph = true; | |
| 263 | |
| 264 while (curr < end) { | |
| 265 fontData = nextFontData; | |
| 266 isMissingGlyph = nextIsMissingGlyph; | |
| 267 isSmallCaps = nextIsSmallCaps; | |
| 268 int index = curr - cp; | |
| 269 | |
| 270 if (!advanceByCombiningCharacterSequence(curr, end, baseCharacter, markC
ount)) | |
| 271 return; | |
| 272 | |
| 273 if (m_font.fontDescription().variant()) { | |
| 274 nextIsSmallCaps = (uppercaseCharacter = u_toupper(baseCharacter)) !=
baseCharacter; | |
| 275 if (nextIsSmallCaps) { | |
| 276 m_smallCapsBuffer[index] = uppercaseCharacter; | |
| 277 for (unsigned i = 0; i < markCount; ++i) | |
| 278 m_smallCapsBuffer[index + i + 1] = cp[index + i + 1]; | |
| 279 } | |
| 280 } | |
| 281 | |
| 282 nextIsMissingGlyph = false; | |
| 283 if (baseCharacter == zeroWidthJoiner) | |
| 284 nextFontData = fontData; | |
| 285 else { | |
| 286 nextFontData = m_font.fontDataForCombiningCharacterSequence(cp + ind
ex, curr - cp - index, nextIsSmallCaps ? SmallCapsVariant : NormalVariant); | |
| 287 if (!nextFontData) | |
| 288 nextIsMissingGlyph = true; | |
| 289 } | |
| 290 | |
| 291 if (nextFontData != fontData || nextIsMissingGlyph != isMissingGlyph) { | |
| 292 int itemStart = static_cast<int>(indexOfFontTransition); | |
| 293 int itemLength = index - indexOfFontTransition; | |
| 294 collectComplexTextRunsForCharacters((isSmallCaps ? m_smallCapsBuffer
.data() : cp) + itemStart, itemLength, itemStart, !isMissingGlyph ? fontData : 0
); | |
| 295 indexOfFontTransition = index; | |
| 296 } | |
| 297 } | |
| 298 | |
| 299 int itemLength = m_end - indexOfFontTransition; | |
| 300 if (itemLength) { | |
| 301 int itemStart = indexOfFontTransition; | |
| 302 collectComplexTextRunsForCharacters((nextIsSmallCaps ? m_smallCapsBuffer
.data() : cp) + itemStart, itemLength, itemStart, !nextIsMissingGlyph ? nextFont
Data : 0); | |
| 303 } | |
| 304 | |
| 305 if (!m_run.ltr()) | |
| 306 m_complexTextRuns.reverse(); | |
| 307 } | |
| 308 | |
| 309 CFIndex ComplexTextController::ComplexTextRun::indexAt(size_t i) const | |
| 310 { | |
| 311 return m_coreTextIndices[i]; | |
| 312 } | |
| 313 | |
| 314 void ComplexTextController::ComplexTextRun::setIsNonMonotonic() | |
| 315 { | |
| 316 ASSERT(m_isMonotonic); | |
| 317 m_isMonotonic = false; | |
| 318 | |
| 319 Vector<bool, 64> mappedIndices(m_stringLength); | |
| 320 for (size_t i = 0; i < m_glyphCount; ++i) { | |
| 321 ASSERT(indexAt(i) < static_cast<CFIndex>(m_stringLength)); | |
| 322 mappedIndices[indexAt(i)] = true; | |
| 323 } | |
| 324 | |
| 325 m_glyphEndOffsets.grow(m_glyphCount); | |
| 326 for (size_t i = 0; i < m_glyphCount; ++i) { | |
| 327 CFIndex nextMappedIndex = m_indexEnd; | |
| 328 for (size_t j = indexAt(i) + 1; j < m_stringLength; ++j) { | |
| 329 if (mappedIndices[j]) { | |
| 330 nextMappedIndex = j; | |
| 331 break; | |
| 332 } | |
| 333 } | |
| 334 m_glyphEndOffsets[i] = nextMappedIndex; | |
| 335 } | |
| 336 } | |
| 337 | |
| 338 unsigned ComplexTextController::findNextRunIndex(unsigned runIndex) const | |
| 339 { | |
| 340 const unsigned runOffset = stringEnd(*m_complexTextRuns[runIndex]); | |
| 341 | |
| 342 // Finds the run with the lowest stringBegin() offset that starts at or | |
| 343 // after |runOffset|. | |
| 344 // | |
| 345 // Note that this can't just find a run whose stringBegin() equals the | |
| 346 // stringEnd() of the previous run because CoreText on Mac OS X 10.6 does | |
| 347 // not return runs covering BiDi control chars, so this has to handle the | |
| 348 // resulting gaps. | |
| 349 unsigned result = 0; | |
| 350 unsigned lowestOffset = UINT_MAX; | |
| 351 for (unsigned i = 0; i < m_complexTextRuns.size(); ++i) { | |
| 352 unsigned offset = stringBegin(*m_complexTextRuns[i]); | |
| 353 if (i != runIndex && offset >= runOffset && offset < lowestOffset) { | |
| 354 lowestOffset = offset; | |
| 355 result = i; | |
| 356 } | |
| 357 } | |
| 358 | |
| 359 ASSERT(lowestOffset != UINT_MAX); | |
| 360 return result; | |
| 361 } | |
| 362 | |
| 363 unsigned ComplexTextController::indexOfCurrentRun(unsigned& leftmostGlyph) | |
| 364 { | |
| 365 leftmostGlyph = 0; | |
| 366 | |
| 367 size_t runCount = m_complexTextRuns.size(); | |
| 368 if (m_currentRun >= runCount) | |
| 369 return runCount; | |
| 370 | |
| 371 if (m_isLTROnly) { | |
| 372 for (unsigned i = 0; i < m_currentRun; ++i) | |
| 373 leftmostGlyph += m_complexTextRuns[i]->glyphCount(); | |
| 374 return m_currentRun; | |
| 375 } | |
| 376 | |
| 377 if (m_runIndices.isEmpty()) { | |
| 378 unsigned firstRun = 0; | |
| 379 unsigned firstRunOffset = stringBegin(*m_complexTextRuns[0]); | |
| 380 for (unsigned i = 1; i < runCount; ++i) { | |
| 381 unsigned offset = stringBegin(*m_complexTextRuns[i]); | |
| 382 if (offset < firstRunOffset) { | |
| 383 firstRun = i; | |
| 384 firstRunOffset = offset; | |
| 385 } | |
| 386 } | |
| 387 m_runIndices.uncheckedAppend(firstRun); | |
| 388 } | |
| 389 | |
| 390 while (m_runIndices.size() <= m_currentRun) { | |
| 391 m_runIndices.uncheckedAppend(findNextRunIndex(m_runIndices.last())); | |
| 392 } | |
| 393 | |
| 394 unsigned currentRunIndex = m_runIndices[m_currentRun]; | |
| 395 leftmostGlyph = m_glyphCountFromStartToIndex[currentRunIndex]; | |
| 396 return currentRunIndex; | |
| 397 } | |
| 398 | |
| 399 unsigned ComplexTextController::incrementCurrentRun(unsigned& leftmostGlyph) | |
| 400 { | |
| 401 if (m_isLTROnly) { | |
| 402 leftmostGlyph += m_complexTextRuns[m_currentRun++]->glyphCount(); | |
| 403 return m_currentRun; | |
| 404 } | |
| 405 | |
| 406 m_currentRun++; | |
| 407 leftmostGlyph = 0; | |
| 408 return indexOfCurrentRun(leftmostGlyph); | |
| 409 } | |
| 410 | |
| 411 void ComplexTextController::advance(unsigned offset, GlyphBuffer* glyphBuffer, G
lyphIterationStyle iterationStyle, HashSet<const SimpleFontData*>* fallbackFonts
) | |
| 412 { | |
| 413 if (static_cast<int>(offset) > m_end) | |
| 414 offset = m_end; | |
| 415 | |
| 416 if (offset <= m_currentCharacter) { | |
| 417 m_runWidthSoFar = m_leadingExpansion; | |
| 418 m_numGlyphsSoFar = 0; | |
| 419 m_currentRun = 0; | |
| 420 m_glyphInCurrentRun = 0; | |
| 421 m_characterInCurrentGlyph = 0; | |
| 422 } | |
| 423 | |
| 424 m_currentCharacter = offset; | |
| 425 | |
| 426 size_t runCount = m_complexTextRuns.size(); | |
| 427 | |
| 428 unsigned leftmostGlyph = 0; | |
| 429 unsigned currentRunIndex = indexOfCurrentRun(leftmostGlyph); | |
| 430 while (m_currentRun < runCount) { | |
| 431 const ComplexTextRun& complexTextRun = *m_complexTextRuns[currentRunInde
x]; | |
| 432 bool ltr = complexTextRun.isLTR(); | |
| 433 size_t glyphCount = complexTextRun.glyphCount(); | |
| 434 unsigned g = ltr ? m_glyphInCurrentRun : glyphCount - 1 - m_glyphInCurre
ntRun; | |
| 435 unsigned k = leftmostGlyph + g; | |
| 436 if (fallbackFonts && complexTextRun.fontData() != m_font.primaryFont()) | |
| 437 fallbackFonts->add(complexTextRun.fontData()); | |
| 438 | |
| 439 while (m_glyphInCurrentRun < glyphCount) { | |
| 440 unsigned glyphStartOffset = complexTextRun.indexAt(g); | |
| 441 unsigned glyphEndOffset; | |
| 442 if (complexTextRun.isMonotonic()) { | |
| 443 if (ltr) | |
| 444 glyphEndOffset = std::max<unsigned>(glyphStartOffset, static
_cast<unsigned>(g + 1 < glyphCount ? complexTextRun.indexAt(g + 1) : complexText
Run.indexEnd())); | |
| 445 else | |
| 446 glyphEndOffset = std::max<unsigned>(glyphStartOffset, static
_cast<unsigned>(g > 0 ? complexTextRun.indexAt(g - 1) : complexTextRun.indexEnd(
))); | |
| 447 } else | |
| 448 glyphEndOffset = complexTextRun.endOffsetAt(g); | |
| 449 | |
| 450 CGSize adjustedAdvance = m_adjustedAdvances[k]; | |
| 451 | |
| 452 if (glyphStartOffset + complexTextRun.stringLocation() >= m_currentC
haracter) | |
| 453 return; | |
| 454 | |
| 455 if (glyphBuffer && !m_characterInCurrentGlyph) | |
| 456 glyphBuffer->add(m_adjustedGlyphs[k], complexTextRun.fontData(),
FloatSize(adjustedAdvance)); | |
| 457 | |
| 458 unsigned oldCharacterInCurrentGlyph = m_characterInCurrentGlyph; | |
| 459 m_characterInCurrentGlyph = std::min(m_currentCharacter - complexTex
tRun.stringLocation(), glyphEndOffset) - glyphStartOffset; | |
| 460 // FIXME: Instead of dividing the glyph's advance equally between th
e characters, this | |
| 461 // could use the glyph's "ligature carets". However, there is no Cor
e Text API to get the | |
| 462 // ligature carets. | |
| 463 if (glyphStartOffset == glyphEndOffset) { | |
| 464 // When there are multiple glyphs per character we need to advan
ce by the full width of the glyph. | |
| 465 ASSERT(m_characterInCurrentGlyph == oldCharacterInCurrentGlyph); | |
| 466 m_runWidthSoFar += adjustedAdvance.width; | |
| 467 } else if (iterationStyle == ByWholeGlyphs) { | |
| 468 if (!oldCharacterInCurrentGlyph) | |
| 469 m_runWidthSoFar += adjustedAdvance.width; | |
| 470 } else | |
| 471 m_runWidthSoFar += adjustedAdvance.width * (m_characterInCurrent
Glyph - oldCharacterInCurrentGlyph) / (glyphEndOffset - glyphStartOffset); | |
| 472 | |
| 473 if (glyphEndOffset + complexTextRun.stringLocation() > m_currentChar
acter) | |
| 474 return; | |
| 475 | |
| 476 m_numGlyphsSoFar++; | |
| 477 m_glyphInCurrentRun++; | |
| 478 m_characterInCurrentGlyph = 0; | |
| 479 if (ltr) { | |
| 480 g++; | |
| 481 k++; | |
| 482 } else { | |
| 483 g--; | |
| 484 k--; | |
| 485 } | |
| 486 } | |
| 487 currentRunIndex = incrementCurrentRun(leftmostGlyph); | |
| 488 m_glyphInCurrentRun = 0; | |
| 489 } | |
| 490 } | |
| 491 | |
| 492 void ComplexTextController::adjustGlyphsAndAdvances() | |
| 493 { | |
| 494 CGFloat widthSinceLastCommit = 0; | |
| 495 size_t runCount = m_complexTextRuns.size(); | |
| 496 bool hasExtraSpacing = (m_font.fontDescription().letterSpacing() || m_font.f
ontDescription().wordSpacing() || m_expansion) && !m_run.spacingDisabled(); | |
| 497 for (size_t r = 0; r < runCount; ++r) { | |
| 498 ComplexTextRun& complexTextRun = *m_complexTextRuns[r]; | |
| 499 unsigned glyphCount = complexTextRun.glyphCount(); | |
| 500 const SimpleFontData* fontData = complexTextRun.fontData(); | |
| 501 | |
| 502 if (!complexTextRun.isLTR()) | |
| 503 m_isLTROnly = false; | |
| 504 | |
| 505 const CGGlyph* glyphs = complexTextRun.glyphs(); | |
| 506 const CGSize* advances = complexTextRun.advances(); | |
| 507 | |
| 508 bool lastRun = r + 1 == runCount; | |
| 509 bool roundsAdvances = fontData->platformData().roundsGlyphAdvances(); | |
| 510 float spaceWidth = fontData->spaceWidth() - fontData->syntheticBoldOffse
t(); | |
| 511 const UChar* cp = complexTextRun.characters(); | |
| 512 CGPoint glyphOrigin = CGPointZero; | |
| 513 CFIndex lastCharacterIndex = m_run.ltr() ? std::numeric_limits<CFIndex>:
:min() : std::numeric_limits<CFIndex>::max(); | |
| 514 bool isMonotonic = true; | |
| 515 | |
| 516 for (unsigned i = 0; i < glyphCount; i++) { | |
| 517 CFIndex characterIndex = complexTextRun.indexAt(i); | |
| 518 if (m_run.ltr()) { | |
| 519 if (characterIndex < lastCharacterIndex) | |
| 520 isMonotonic = false; | |
| 521 } else { | |
| 522 if (characterIndex > lastCharacterIndex) | |
| 523 isMonotonic = false; | |
| 524 } | |
| 525 UChar ch = *(cp + characterIndex); | |
| 526 bool lastGlyph = lastRun && i + 1 == glyphCount; | |
| 527 UChar nextCh; | |
| 528 if (lastGlyph) | |
| 529 nextCh = ' '; | |
| 530 else if (i + 1 < glyphCount) | |
| 531 nextCh = *(cp + complexTextRun.indexAt(i + 1)); | |
| 532 else | |
| 533 nextCh = *(m_complexTextRuns[r + 1]->characters() + m_complexTex
tRuns[r + 1]->indexAt(0)); | |
| 534 | |
| 535 bool treatAsSpace = Character::treatAsSpace(ch); | |
| 536 CGGlyph glyph = treatAsSpace ? fontData->spaceGlyph() : glyphs[i]; | |
| 537 CGSize advance = treatAsSpace ? CGSizeMake(spaceWidth, advances[i].h
eight) : advances[i]; | |
| 538 | |
| 539 if (ch == '\t' && m_run.allowTabs()) { | |
| 540 advance.width = m_font.tabWidth(*fontData, m_run.tabSize(), m_ru
n.xPos() + m_totalWidth + widthSinceLastCommit); | |
| 541 } else if (Character::treatAsZeroWidthSpace(ch) && !treatAsSpace) { | |
| 542 advance.width = 0; | |
| 543 glyph = fontData->spaceGlyph(); | |
| 544 } | |
| 545 | |
| 546 float roundedAdvanceWidth = roundf(advance.width); | |
| 547 if (roundsAdvances) | |
| 548 advance.width = roundedAdvanceWidth; | |
| 549 | |
| 550 advance.width += fontData->syntheticBoldOffset(); | |
| 551 | |
| 552 if (hasExtraSpacing) { | |
| 553 // If we're a glyph with an advance, go ahead and add in letter-
spacing. | |
| 554 // That way we weed out zero width lurkers. This behavior match
es the fast text code path. | |
| 555 if (advance.width && m_font.fontDescription().letterSpacing()) | |
| 556 advance.width += m_font.fontDescription().letterSpacing(); | |
| 557 | |
| 558 // Handle justification and word-spacing. | |
| 559 if (treatAsSpace || Character::isCJKIdeographOrSymbol(ch)) { | |
| 560 // Distribute the run's total expansion evenly over all expa
nsion opportunities in the run. | |
| 561 if (m_expansion) { | |
| 562 if (!treatAsSpace && !m_afterExpansion) { | |
| 563 // Take the expansion opportunity before this ideogr
aph. | |
| 564 m_expansion -= m_expansionPerOpportunity; | |
| 565 float expansionAtThisOpportunity = m_expansionPerOpp
ortunity; | |
| 566 m_totalWidth += expansionAtThisOpportunity; | |
| 567 if (m_adjustedAdvances.isEmpty()) | |
| 568 m_leadingExpansion = expansionAtThisOpportunity; | |
| 569 else | |
| 570 m_adjustedAdvances.last().width += expansionAtTh
isOpportunity; | |
| 571 } | |
| 572 if (!lastGlyph || m_run.allowsTrailingExpansion()) { | |
| 573 m_expansion -= m_expansionPerOpportunity; | |
| 574 advance.width += m_expansionPerOpportunity; | |
| 575 m_afterExpansion = true; | |
| 576 } | |
| 577 } else | |
| 578 m_afterExpansion = false; | |
| 579 | |
| 580 // Account for word-spacing. | |
| 581 if (treatAsSpace && (ch != '\t' || !m_run.allowTabs()) && (c
haracterIndex > 0 || r > 0) && m_font.fontDescription().wordSpacing()) | |
| 582 advance.width += m_font.fontDescription().wordSpacing(); | |
| 583 } else | |
| 584 m_afterExpansion = false; | |
| 585 } | |
| 586 | |
| 587 widthSinceLastCommit += advance.width; | |
| 588 | |
| 589 // FIXME: Combining marks should receive a text emphasis mark if the
y are combine with a space. | |
| 590 if (m_forTextEmphasis && (!Character::canReceiveTextEmphasis(ch) ||
(U_GET_GC_MASK(ch) & U_GC_M_MASK))) | |
| 591 glyph = 0; | |
| 592 | |
| 593 advance.height *= -1; | |
| 594 m_adjustedAdvances.append(advance); | |
| 595 m_adjustedGlyphs.append(glyph); | |
| 596 | |
| 597 FloatRect glyphBounds = fontData->boundsForGlyph(glyph); | |
| 598 glyphBounds.move(glyphOrigin.x, glyphOrigin.y); | |
| 599 m_minGlyphBoundingBoxX = std::min(m_minGlyphBoundingBoxX, glyphBound
s.x()); | |
| 600 m_maxGlyphBoundingBoxX = std::max(m_maxGlyphBoundingBoxX, glyphBound
s.maxX()); | |
| 601 m_minGlyphBoundingBoxY = std::min(m_minGlyphBoundingBoxY, glyphBound
s.y()); | |
| 602 m_maxGlyphBoundingBoxY = std::max(m_maxGlyphBoundingBoxY, glyphBound
s.maxY()); | |
| 603 glyphOrigin.x += advance.width; | |
| 604 glyphOrigin.y += advance.height; | |
| 605 | |
| 606 lastCharacterIndex = characterIndex; | |
| 607 } | |
| 608 if (!isMonotonic) | |
| 609 complexTextRun.setIsNonMonotonic(); | |
| 610 } | |
| 611 m_totalWidth += widthSinceLastCommit; | |
| 612 } | |
| 613 | |
| 614 } // namespace blink | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 175253002:
Switch to HarfBuzz on Mac and remove CoreText shaper (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master