| OLD | NEW |
|---|
| (Empty) |
| 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 <ApplicationServices/ApplicationServices.h> | |
| 29 #include "platform/fonts/Character.h" | |
| 30 #include "platform/fonts/Font.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 | |
| 37 using namespace std; | |
| 38 | |
| 39 namespace WebCore { | |
| 40 | |
| 41 static inline CGFloat roundCGFloat(CGFloat f) | |
| 42 { | |
| 43 if (sizeof(CGFloat) == sizeof(float)) | |
| 44 return roundf(static_cast<float>(f)); | |
| 45 return static_cast<CGFloat>(round(f)); | |
| 46 } | |
| 47 | |
| 48 static inline CGFloat ceilCGFloat(CGFloat f) | |
| 49 { | |
| 50 if (sizeof(CGFloat) == sizeof(float)) | |
| 51 return ceilf(static_cast<float>(f)); | |
| 52 return static_cast<CGFloat>(ceil(f)); | |
| 53 } | |
| 54 | |
| 55 ComplexTextController::ComplexTextController(const Font* font, const TextRun& ru
n, bool mayUseNaturalWritingDirection, HashSet<const SimpleFontData*>* fallbackF
onts, bool forTextEmphasis) | |
| 56 : m_font(*font) | |
| 57 , m_run(run) | |
| 58 , m_isLTROnly(true) | |
| 59 , m_mayUseNaturalWritingDirection(mayUseNaturalWritingDirection) | |
| 60 , m_forTextEmphasis(forTextEmphasis) | |
| 61 , m_currentCharacter(0) | |
| 62 , m_end(run.length()) | |
| 63 , m_totalWidth(0) | |
| 64 , m_runWidthSoFar(0) | |
| 65 , m_numGlyphsSoFar(0) | |
| 66 , m_currentRun(0) | |
| 67 , m_glyphInCurrentRun(0) | |
| 68 , m_characterInCurrentGlyph(0) | |
| 69 , m_finalRoundingWidth(0) | |
| 70 , m_expansion(run.expansion()) | |
| 71 , m_leadingExpansion(0) | |
| 72 , m_afterExpansion(!run.allowsLeadingExpansion()) | |
| 73 , m_fallbackFonts(fallbackFonts) | |
| 74 , m_minGlyphBoundingBoxX(numeric_limits<float>::max()) | |
| 75 , m_maxGlyphBoundingBoxX(numeric_limits<float>::min()) | |
| 76 , m_minGlyphBoundingBoxY(numeric_limits<float>::max()) | |
| 77 , m_maxGlyphBoundingBoxY(numeric_limits<float>::min()) | |
| 78 , m_lastRoundingGlyph(0) | |
| 79 { | |
| 80 if (!m_expansion) | |
| 81 m_expansionPerOpportunity = 0; | |
| 82 else { | |
| 83 bool isAfterExpansion = m_afterExpansion; | |
| 84 unsigned expansionOpportunityCount; | |
| 85 if (m_run.is8Bit()) | |
| 86 expansionOpportunityCount = Character::expansionOpportunityCount(m_r
un.characters8(), m_end, m_run.ltr() ? LTR : RTL, isAfterExpansion); | |
| 87 else | |
| 88 expansionOpportunityCount = Character::expansionOpportunityCount(m_r
un.characters16(), m_end, m_run.ltr() ? LTR : RTL, isAfterExpansion); | |
| 89 if (isAfterExpansion && !m_run.allowsTrailingExpansion()) | |
| 90 expansionOpportunityCount--; | |
| 91 | |
| 92 if (!expansionOpportunityCount) | |
| 93 m_expansionPerOpportunity = 0; | |
| 94 else | |
| 95 m_expansionPerOpportunity = m_expansion / expansionOpportunityCount; | |
| 96 } | |
| 97 | |
| 98 collectComplexTextRuns(); | |
| 99 adjustGlyphsAndAdvances(); | |
| 100 | |
| 101 if (!m_isLTROnly) { | |
| 102 m_runIndices.reserveInitialCapacity(m_complexTextRuns.size()); | |
| 103 | |
| 104 m_glyphCountFromStartToIndex.reserveInitialCapacity(m_complexTextRuns.si
ze()); | |
| 105 unsigned glyphCountSoFar = 0; | |
| 106 for (unsigned i = 0; i < m_complexTextRuns.size(); ++i) { | |
| 107 m_glyphCountFromStartToIndex.uncheckedAppend(glyphCountSoFar); | |
| 108 glyphCountSoFar += m_complexTextRuns[i]->glyphCount(); | |
| 109 } | |
| 110 } | |
| 111 | |
| 112 m_runWidthSoFar = m_leadingExpansion; | |
| 113 } | |
| 114 | |
| 115 int ComplexTextController::offsetForPosition(float h, bool includePartialGlyphs) | |
| 116 { | |
| 117 if (h >= m_totalWidth) | |
| 118 return m_run.ltr() ? m_end : 0; | |
| 119 | |
| 120 h -= m_leadingExpansion; | |
| 121 if (h < 0) | |
| 122 return m_run.ltr() ? 0 : m_end; | |
| 123 | |
| 124 CGFloat x = h; | |
| 125 | |
| 126 size_t runCount = m_complexTextRuns.size(); | |
| 127 size_t offsetIntoAdjustedGlyphs = 0; | |
| 128 | |
| 129 for (size_t r = 0; r < runCount; ++r) { | |
| 130 const ComplexTextRun& complexTextRun = *m_complexTextRuns[r]; | |
| 131 for (unsigned j = 0; j < complexTextRun.glyphCount(); ++j) { | |
| 132 CGFloat adjustedAdvance = m_adjustedAdvances[offsetIntoAdjustedGlyph
s + j].width; | |
| 133 if (x < adjustedAdvance) { | |
| 134 CFIndex hitGlyphStart = complexTextRun.indexAt(j); | |
| 135 CFIndex hitGlyphEnd; | |
| 136 if (m_run.ltr()) | |
| 137 hitGlyphEnd = max<CFIndex>(hitGlyphStart, j + 1 < complexTex
tRun.glyphCount() ? complexTextRun.indexAt(j + 1) : static_cast<CFIndex>(complex
TextRun.indexEnd())); | |
| 138 else | |
| 139 hitGlyphEnd = max<CFIndex>(hitGlyphStart, j > 0 ? complexTex
tRun.indexAt(j - 1) : static_cast<CFIndex>(complexTextRun.indexEnd())); | |
| 140 | |
| 141 // FIXME: Instead of dividing the glyph's advance equally betwee
n the characters, this | |
| 142 // could use the glyph's "ligature carets". However, there is no
Core Text API to get the | |
| 143 // ligature carets. | |
| 144 CFIndex hitIndex = hitGlyphStart + (hitGlyphEnd - hitGlyphStart)
* (m_run.ltr() ? x / adjustedAdvance : 1 - x / adjustedAdvance); | |
| 145 int stringLength = complexTextRun.stringLength(); | |
| 146 TextBreakIterator* cursorPositionIterator = cursorMovementIterat
or(complexTextRun.characters(), stringLength); | |
| 147 int clusterStart; | |
| 148 if (cursorPositionIterator->isBoundary(hitIndex)) | |
| 149 clusterStart = hitIndex; | |
| 150 else { | |
| 151 clusterStart = cursorPositionIterator->preceding(hitIndex); | |
| 152 if (clusterStart == TextBreakDone) | |
| 153 clusterStart = 0; | |
| 154 } | |
| 155 | |
| 156 if (!includePartialGlyphs) | |
| 157 return complexTextRun.stringLocation() + clusterStart; | |
| 158 | |
| 159 int clusterEnd = cursorPositionIterator->following(hitIndex); | |
| 160 if (clusterEnd == TextBreakDone) | |
| 161 clusterEnd = stringLength; | |
| 162 | |
| 163 CGFloat clusterWidth; | |
| 164 // FIXME: The search stops at the boundaries of complexTextRun.
In theory, it should go on into neighboring ComplexTextRuns | |
| 165 // derived from the same CTLine. In practice, we do not expect t
here to be more than one CTRun in a CTLine, as no | |
| 166 // reordering and no font fallback should occur within a CTLine. | |
| 167 if (clusterEnd - clusterStart > 1) { | |
| 168 clusterWidth = adjustedAdvance; | |
| 169 int firstGlyphBeforeCluster = j - 1; | |
| 170 while (firstGlyphBeforeCluster >= 0 && complexTextRun.indexA
t(firstGlyphBeforeCluster) >= clusterStart && complexTextRun.indexAt(firstGlyphB
eforeCluster) < clusterEnd) { | |
| 171 CGFloat width = m_adjustedAdvances[offsetIntoAdjustedGly
phs + firstGlyphBeforeCluster].width; | |
| 172 clusterWidth += width; | |
| 173 x += width; | |
| 174 firstGlyphBeforeCluster--; | |
| 175 } | |
| 176 unsigned firstGlyphAfterCluster = j + 1; | |
| 177 while (firstGlyphAfterCluster < complexTextRun.glyphCount()
&& complexTextRun.indexAt(firstGlyphAfterCluster) >= clusterStart && complexText
Run.indexAt(firstGlyphAfterCluster) < clusterEnd) { | |
| 178 clusterWidth += m_adjustedAdvances[offsetIntoAdjustedGly
phs + firstGlyphAfterCluster].width; | |
| 179 firstGlyphAfterCluster++; | |
| 180 } | |
| 181 } else { | |
| 182 clusterWidth = adjustedAdvance / (hitGlyphEnd - hitGlyphStar
t); | |
| 183 x -= clusterWidth * (m_run.ltr() ? hitIndex - hitGlyphStart
: hitGlyphEnd - hitIndex - 1); | |
| 184 } | |
| 185 if (x <= clusterWidth / 2) | |
| 186 return complexTextRun.stringLocation() + (m_run.ltr() ? clus
terStart : clusterEnd); | |
| 187 else | |
| 188 return complexTextRun.stringLocation() + (m_run.ltr() ? clus
terEnd : clusterStart); | |
| 189 } | |
| 190 x -= adjustedAdvance; | |
| 191 } | |
| 192 offsetIntoAdjustedGlyphs += complexTextRun.glyphCount(); | |
| 193 } | |
| 194 | |
| 195 ASSERT_NOT_REACHED(); | |
| 196 return 0; | |
| 197 } | |
| 198 | |
| 199 static bool advanceByCombiningCharacterSequence(const UChar*& iterator, const UC
har* end, UChar32& baseCharacter, unsigned& markCount) | |
| 200 { | |
| 201 ASSERT(iterator < end); | |
| 202 | |
| 203 markCount = 0; | |
| 204 | |
| 205 baseCharacter = *iterator++; | |
| 206 | |
| 207 if (U16_IS_SURROGATE(baseCharacter)) { | |
| 208 if (!U16_IS_LEAD(baseCharacter)) | |
| 209 return false; | |
| 210 if (iterator == end) | |
| 211 return false; | |
| 212 UChar trail = *iterator++; | |
| 213 if (!U16_IS_TRAIL(trail)) | |
| 214 return false; | |
| 215 baseCharacter = U16_GET_SUPPLEMENTARY(baseCharacter, trail); | |
| 216 } | |
| 217 | |
| 218 // Consume marks. | |
| 219 while (iterator < end) { | |
| 220 UChar32 nextCharacter; | |
| 221 int markLength = 0; | |
| 222 U16_NEXT(iterator, markLength, end - iterator, nextCharacter); | |
| 223 if (!(U_GET_GC_MASK(nextCharacter) & U_GC_M_MASK)) | |
| 224 break; | |
| 225 markCount += markLength; | |
| 226 iterator += markLength; | |
| 227 } | |
| 228 | |
| 229 return true; | |
| 230 } | |
| 231 | |
| 232 void ComplexTextController::collectComplexTextRuns() | |
| 233 { | |
| 234 if (!m_end) | |
| 235 return; | |
| 236 | |
| 237 // We break up glyph run generation for the string by FontData. | |
| 238 const UChar* cp; | |
| 239 | |
| 240 if (m_run.is8Bit()) { | |
| 241 String stringFor8BitRun = String::make16BitFrom8BitSource(m_run.characte
rs8(), m_run.length()); | |
| 242 cp = stringFor8BitRun.characters16(); | |
| 243 m_stringsFor8BitRuns.append(stringFor8BitRun); | |
| 244 } else | |
| 245 cp = m_run.characters16(); | |
| 246 | |
| 247 if (m_font.fontDescription().variant()) | |
| 248 m_smallCapsBuffer.resize(m_end); | |
| 249 | |
| 250 unsigned indexOfFontTransition = 0; | |
| 251 const UChar* curr = cp; | |
| 252 const UChar* end = cp + m_end; | |
| 253 | |
| 254 const SimpleFontData* fontData; | |
| 255 bool isMissingGlyph; | |
| 256 const SimpleFontData* nextFontData; | |
| 257 bool nextIsMissingGlyph; | |
| 258 | |
| 259 unsigned markCount; | |
| 260 const UChar* sequenceStart = curr; | |
| 261 UChar32 baseCharacter; | |
| 262 if (!advanceByCombiningCharacterSequence(curr, end, baseCharacter, markCount
)) | |
| 263 return; | |
| 264 | |
| 265 UChar uppercaseCharacter = 0; | |
| 266 | |
| 267 bool isSmallCaps; | |
| 268 bool nextIsSmallCaps = m_font.fontDescription().variant() && !(U_GET_GC_MASK
(baseCharacter) & U_GC_M_MASK) && (uppercaseCharacter = u_toupper(baseCharacter)
) != baseCharacter; | |
| 269 | |
| 270 if (nextIsSmallCaps) { | |
| 271 m_smallCapsBuffer[sequenceStart - cp] = uppercaseCharacter; | |
| 272 for (unsigned i = 0; i < markCount; ++i) | |
| 273 m_smallCapsBuffer[sequenceStart - cp + i + 1] = sequenceStart[i + 1]
; | |
| 274 } | |
| 275 | |
| 276 nextIsMissingGlyph = false; | |
| 277 nextFontData = m_font.fontDataForCombiningCharacterSequence(sequenceStart, c
urr - sequenceStart, nextIsSmallCaps ? SmallCapsVariant : NormalVariant); | |
| 278 if (!nextFontData) | |
| 279 nextIsMissingGlyph = true; | |
| 280 | |
| 281 while (curr < end) { | |
| 282 fontData = nextFontData; | |
| 283 isMissingGlyph = nextIsMissingGlyph; | |
| 284 isSmallCaps = nextIsSmallCaps; | |
| 285 int index = curr - cp; | |
| 286 | |
| 287 if (!advanceByCombiningCharacterSequence(curr, end, baseCharacter, markC
ount)) | |
| 288 return; | |
| 289 | |
| 290 if (m_font.fontDescription().variant()) { | |
| 291 nextIsSmallCaps = (uppercaseCharacter = u_toupper(baseCharacter)) !=
baseCharacter; | |
| 292 if (nextIsSmallCaps) { | |
| 293 m_smallCapsBuffer[index] = uppercaseCharacter; | |
| 294 for (unsigned i = 0; i < markCount; ++i) | |
| 295 m_smallCapsBuffer[index + i + 1] = cp[index + i + 1]; | |
| 296 } | |
| 297 } | |
| 298 | |
| 299 nextIsMissingGlyph = false; | |
| 300 if (baseCharacter == zeroWidthJoiner) | |
| 301 nextFontData = fontData; | |
| 302 else { | |
| 303 nextFontData = m_font.fontDataForCombiningCharacterSequence(cp + ind
ex, curr - cp - index, nextIsSmallCaps ? SmallCapsVariant : NormalVariant); | |
| 304 if (!nextFontData) | |
| 305 nextIsMissingGlyph = true; | |
| 306 } | |
| 307 | |
| 308 if (nextFontData != fontData || nextIsMissingGlyph != isMissingGlyph) { | |
| 309 int itemStart = static_cast<int>(indexOfFontTransition); | |
| 310 int itemLength = index - indexOfFontTransition; | |
| 311 collectComplexTextRunsForCharacters((isSmallCaps ? m_smallCapsBuffer
.data() : cp) + itemStart, itemLength, itemStart, !isMissingGlyph ? fontData : 0
); | |
| 312 indexOfFontTransition = index; | |
| 313 } | |
| 314 } | |
| 315 | |
| 316 int itemLength = m_end - indexOfFontTransition; | |
| 317 if (itemLength) { | |
| 318 int itemStart = indexOfFontTransition; | |
| 319 collectComplexTextRunsForCharacters((nextIsSmallCaps ? m_smallCapsBuffer
.data() : cp) + itemStart, itemLength, itemStart, !nextIsMissingGlyph ? nextFont
Data : 0); | |
| 320 } | |
| 321 | |
| 322 if (!m_run.ltr()) | |
| 323 m_complexTextRuns.reverse(); | |
| 324 } | |
| 325 | |
| 326 CFIndex ComplexTextController::ComplexTextRun::indexAt(size_t i) const | |
| 327 { | |
| 328 return m_coreTextIndices[i]; | |
| 329 } | |
| 330 | |
| 331 void ComplexTextController::ComplexTextRun::setIsNonMonotonic() | |
| 332 { | |
| 333 ASSERT(m_isMonotonic); | |
| 334 m_isMonotonic = false; | |
| 335 | |
| 336 Vector<bool, 64> mappedIndices(m_stringLength); | |
| 337 for (size_t i = 0; i < m_glyphCount; ++i) { | |
| 338 ASSERT(indexAt(i) < static_cast<CFIndex>(m_stringLength)); | |
| 339 mappedIndices[indexAt(i)] = true; | |
| 340 } | |
| 341 | |
| 342 m_glyphEndOffsets.grow(m_glyphCount); | |
| 343 for (size_t i = 0; i < m_glyphCount; ++i) { | |
| 344 CFIndex nextMappedIndex = m_indexEnd; | |
| 345 for (size_t j = indexAt(i) + 1; j < m_stringLength; ++j) { | |
| 346 if (mappedIndices[j]) { | |
| 347 nextMappedIndex = j; | |
| 348 break; | |
| 349 } | |
| 350 } | |
| 351 m_glyphEndOffsets[i] = nextMappedIndex; | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 unsigned ComplexTextController::findNextRunIndex(unsigned runIndex) const | |
| 356 { | |
| 357 const unsigned runOffset = stringEnd(*m_complexTextRuns[runIndex]); | |
| 358 | |
| 359 // Finds the run with the lowest stringBegin() offset that starts at or | |
| 360 // after |runOffset|. | |
| 361 // | |
| 362 // Note that this can't just find a run whose stringBegin() equals the | |
| 363 // stringEnd() of the previous run because CoreText on Mac OS X 10.6 does | |
| 364 // not return runs covering BiDi control chars, so this has to handle the | |
| 365 // resulting gaps. | |
| 366 unsigned result = 0; | |
| 367 unsigned lowestOffset = UINT_MAX; | |
| 368 for (unsigned i = 0; i < m_complexTextRuns.size(); ++i) { | |
| 369 unsigned offset = stringBegin(*m_complexTextRuns[i]); | |
| 370 if (i != runIndex && offset >= runOffset && offset < lowestOffset) { | |
| 371 lowestOffset = offset; | |
| 372 result = i; | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 ASSERT(lowestOffset != UINT_MAX); | |
| 377 return result; | |
| 378 } | |
| 379 | |
| 380 unsigned ComplexTextController::indexOfCurrentRun(unsigned& leftmostGlyph) | |
| 381 { | |
| 382 leftmostGlyph = 0; | |
| 383 | |
| 384 size_t runCount = m_complexTextRuns.size(); | |
| 385 if (m_currentRun >= runCount) | |
| 386 return runCount; | |
| 387 | |
| 388 if (m_isLTROnly) { | |
| 389 for (unsigned i = 0; i < m_currentRun; ++i) | |
| 390 leftmostGlyph += m_complexTextRuns[i]->glyphCount(); | |
| 391 return m_currentRun; | |
| 392 } | |
| 393 | |
| 394 if (m_runIndices.isEmpty()) { | |
| 395 unsigned firstRun = 0; | |
| 396 unsigned firstRunOffset = stringBegin(*m_complexTextRuns[0]); | |
| 397 for (unsigned i = 1; i < runCount; ++i) { | |
| 398 unsigned offset = stringBegin(*m_complexTextRuns[i]); | |
| 399 if (offset < firstRunOffset) { | |
| 400 firstRun = i; | |
| 401 firstRunOffset = offset; | |
| 402 } | |
| 403 } | |
| 404 m_runIndices.uncheckedAppend(firstRun); | |
| 405 } | |
| 406 | |
| 407 while (m_runIndices.size() <= m_currentRun) { | |
| 408 m_runIndices.uncheckedAppend(findNextRunIndex(m_runIndices.last())); | |
| 409 } | |
| 410 | |
| 411 unsigned currentRunIndex = m_runIndices[m_currentRun]; | |
| 412 leftmostGlyph = m_glyphCountFromStartToIndex[currentRunIndex]; | |
| 413 return currentRunIndex; | |
| 414 } | |
| 415 | |
| 416 unsigned ComplexTextController::incrementCurrentRun(unsigned& leftmostGlyph) | |
| 417 { | |
| 418 if (m_isLTROnly) { | |
| 419 leftmostGlyph += m_complexTextRuns[m_currentRun++]->glyphCount(); | |
| 420 return m_currentRun; | |
| 421 } | |
| 422 | |
| 423 m_currentRun++; | |
| 424 leftmostGlyph = 0; | |
| 425 return indexOfCurrentRun(leftmostGlyph); | |
| 426 } | |
| 427 | |
| 428 void ComplexTextController::advance(unsigned offset, GlyphBuffer* glyphBuffer, G
lyphIterationStyle iterationStyle, HashSet<const SimpleFontData*>* fallbackFonts
) | |
| 429 { | |
| 430 if (static_cast<int>(offset) > m_end) | |
| 431 offset = m_end; | |
| 432 | |
| 433 if (offset <= m_currentCharacter) { | |
| 434 m_runWidthSoFar = m_leadingExpansion; | |
| 435 m_numGlyphsSoFar = 0; | |
| 436 m_currentRun = 0; | |
| 437 m_glyphInCurrentRun = 0; | |
| 438 m_characterInCurrentGlyph = 0; | |
| 439 } | |
| 440 | |
| 441 m_currentCharacter = offset; | |
| 442 | |
| 443 size_t runCount = m_complexTextRuns.size(); | |
| 444 | |
| 445 unsigned leftmostGlyph = 0; | |
| 446 unsigned currentRunIndex = indexOfCurrentRun(leftmostGlyph); | |
| 447 while (m_currentRun < runCount) { | |
| 448 const ComplexTextRun& complexTextRun = *m_complexTextRuns[currentRunInde
x]; | |
| 449 bool ltr = complexTextRun.isLTR(); | |
| 450 size_t glyphCount = complexTextRun.glyphCount(); | |
| 451 unsigned g = ltr ? m_glyphInCurrentRun : glyphCount - 1 - m_glyphInCurre
ntRun; | |
| 452 unsigned k = leftmostGlyph + g; | |
| 453 if (fallbackFonts && complexTextRun.fontData() != m_font.primaryFont()) | |
| 454 fallbackFonts->add(complexTextRun.fontData()); | |
| 455 | |
| 456 while (m_glyphInCurrentRun < glyphCount) { | |
| 457 unsigned glyphStartOffset = complexTextRun.indexAt(g); | |
| 458 unsigned glyphEndOffset; | |
| 459 if (complexTextRun.isMonotonic()) { | |
| 460 if (ltr) | |
| 461 glyphEndOffset = max<unsigned>(glyphStartOffset, static_cast
<unsigned>(g + 1 < glyphCount ? complexTextRun.indexAt(g + 1) : complexTextRun.i
ndexEnd())); | |
| 462 else | |
| 463 glyphEndOffset = max<unsigned>(glyphStartOffset, static_cast
<unsigned>(g > 0 ? complexTextRun.indexAt(g - 1) : complexTextRun.indexEnd())); | |
| 464 } else | |
| 465 glyphEndOffset = complexTextRun.endOffsetAt(g); | |
| 466 | |
| 467 CGSize adjustedAdvance = m_adjustedAdvances[k]; | |
| 468 | |
| 469 if (glyphStartOffset + complexTextRun.stringLocation() >= m_currentC
haracter) | |
| 470 return; | |
| 471 | |
| 472 if (glyphBuffer && !m_characterInCurrentGlyph) | |
| 473 glyphBuffer->add(m_adjustedGlyphs[k], complexTextRun.fontData(),
adjustedAdvance); | |
| 474 | |
| 475 unsigned oldCharacterInCurrentGlyph = m_characterInCurrentGlyph; | |
| 476 m_characterInCurrentGlyph = min(m_currentCharacter - complexTextRun.
stringLocation(), glyphEndOffset) - glyphStartOffset; | |
| 477 // FIXME: Instead of dividing the glyph's advance equally between th
e characters, this | |
| 478 // could use the glyph's "ligature carets". However, there is no Cor
e Text API to get the | |
| 479 // ligature carets. | |
| 480 if (glyphStartOffset == glyphEndOffset) { | |
| 481 // When there are multiple glyphs per character we need to advan
ce by the full width of the glyph. | |
| 482 ASSERT(m_characterInCurrentGlyph == oldCharacterInCurrentGlyph); | |
| 483 m_runWidthSoFar += adjustedAdvance.width; | |
| 484 } else if (iterationStyle == ByWholeGlyphs) { | |
| 485 if (!oldCharacterInCurrentGlyph) | |
| 486 m_runWidthSoFar += adjustedAdvance.width; | |
| 487 } else | |
| 488 m_runWidthSoFar += adjustedAdvance.width * (m_characterInCurrent
Glyph - oldCharacterInCurrentGlyph) / (glyphEndOffset - glyphStartOffset); | |
| 489 | |
| 490 if (glyphEndOffset + complexTextRun.stringLocation() > m_currentChar
acter) | |
| 491 return; | |
| 492 | |
| 493 m_numGlyphsSoFar++; | |
| 494 m_glyphInCurrentRun++; | |
| 495 m_characterInCurrentGlyph = 0; | |
| 496 if (ltr) { | |
| 497 g++; | |
| 498 k++; | |
| 499 } else { | |
| 500 g--; | |
| 501 k--; | |
| 502 } | |
| 503 } | |
| 504 currentRunIndex = incrementCurrentRun(leftmostGlyph); | |
| 505 m_glyphInCurrentRun = 0; | |
| 506 } | |
| 507 if (!m_run.ltr() && m_numGlyphsSoFar == m_adjustedAdvances.size()) | |
| 508 m_runWidthSoFar += m_finalRoundingWidth; | |
| 509 } | |
| 510 | |
| 511 void ComplexTextController::adjustGlyphsAndAdvances() | |
| 512 { | |
| 513 CGFloat widthSinceLastCommit = 0; | |
| 514 size_t runCount = m_complexTextRuns.size(); | |
| 515 bool hasExtraSpacing = (m_font.fontDescription().letterSpacing() || m_font.f
ontDescription().wordSpacing() || m_expansion) && !m_run.spacingDisabled(); | |
| 516 for (size_t r = 0; r < runCount; ++r) { | |
| 517 ComplexTextRun& complexTextRun = *m_complexTextRuns[r]; | |
| 518 unsigned glyphCount = complexTextRun.glyphCount(); | |
| 519 const SimpleFontData* fontData = complexTextRun.fontData(); | |
| 520 | |
| 521 if (!complexTextRun.isLTR()) | |
| 522 m_isLTROnly = false; | |
| 523 | |
| 524 const CGGlyph* glyphs = complexTextRun.glyphs(); | |
| 525 const CGSize* advances = complexTextRun.advances(); | |
| 526 | |
| 527 bool lastRun = r + 1 == runCount; | |
| 528 bool roundsAdvances = !m_font.fontDescription().usePrinterFont() && font
Data->platformData().roundsGlyphAdvances(); | |
| 529 float spaceWidth = fontData->spaceWidth() - fontData->syntheticBoldOffse
t(); | |
| 530 CGFloat roundedSpaceWidth = roundCGFloat(spaceWidth); | |
| 531 const UChar* cp = complexTextRun.characters(); | |
| 532 CGPoint glyphOrigin = CGPointZero; | |
| 533 CFIndex lastCharacterIndex = m_run.ltr() ? numeric_limits<CFIndex>::min(
) : numeric_limits<CFIndex>::max(); | |
| 534 bool isMonotonic = true; | |
| 535 | |
| 536 for (unsigned i = 0; i < glyphCount; i++) { | |
| 537 CFIndex characterIndex = complexTextRun.indexAt(i); | |
| 538 if (m_run.ltr()) { | |
| 539 if (characterIndex < lastCharacterIndex) | |
| 540 isMonotonic = false; | |
| 541 } else { | |
| 542 if (characterIndex > lastCharacterIndex) | |
| 543 isMonotonic = false; | |
| 544 } | |
| 545 UChar ch = *(cp + characterIndex); | |
| 546 bool lastGlyph = lastRun && i + 1 == glyphCount; | |
| 547 UChar nextCh; | |
| 548 if (lastGlyph) | |
| 549 nextCh = ' '; | |
| 550 else if (i + 1 < glyphCount) | |
| 551 nextCh = *(cp + complexTextRun.indexAt(i + 1)); | |
| 552 else | |
| 553 nextCh = *(m_complexTextRuns[r + 1]->characters() + m_complexTex
tRuns[r + 1]->indexAt(0)); | |
| 554 | |
| 555 bool treatAsSpace = Character::treatAsSpace(ch); | |
| 556 CGGlyph glyph = treatAsSpace ? fontData->spaceGlyph() : glyphs[i]; | |
| 557 CGSize advance = treatAsSpace ? CGSizeMake(spaceWidth, advances[i].h
eight) : advances[i]; | |
| 558 | |
| 559 if (ch == '\t' && m_run.allowTabs()) { | |
| 560 advance.width = m_font.tabWidth(*fontData, m_run.tabSize(), m_ru
n.xPos() + m_totalWidth + widthSinceLastCommit); | |
| 561 } else if (Character::treatAsZeroWidthSpace(ch) && !treatAsSpace) { | |
| 562 advance.width = 0; | |
| 563 glyph = fontData->spaceGlyph(); | |
| 564 } | |
| 565 | |
| 566 float roundedAdvanceWidth = roundf(advance.width); | |
| 567 if (roundsAdvances) | |
| 568 advance.width = roundedAdvanceWidth; | |
| 569 | |
| 570 advance.width += fontData->syntheticBoldOffset(); | |
| 571 | |
| 572 | |
| 573 // We special case spaces in two ways when applying word rounding. | |
| 574 // First, we round spaces to an adjusted width in all fonts. | |
| 575 // Second, in fixed-pitch fonts we ensure that all glyphs that | |
| 576 // match the width of the space glyph have the same width as the spa
ce glyph. | |
| 577 if (m_run.applyWordRounding() && roundedAdvanceWidth == roundedSpace
Width && (fontData->pitch() == FixedPitch || glyph == fontData->spaceGlyph())) | |
| 578 advance.width = fontData->adjustedSpaceWidth(); | |
| 579 | |
| 580 if (hasExtraSpacing) { | |
| 581 // If we're a glyph with an advance, go ahead and add in letter-
spacing. | |
| 582 // That way we weed out zero width lurkers. This behavior match
es the fast text code path. | |
| 583 if (advance.width && m_font.fontDescription().letterSpacing()) | |
| 584 advance.width += m_font.fontDescription().letterSpacing(); | |
| 585 | |
| 586 // Handle justification and word-spacing. | |
| 587 if (treatAsSpace || Character::isCJKIdeographOrSymbol(ch)) { | |
| 588 // Distribute the run's total expansion evenly over all expa
nsion opportunities in the run. | |
| 589 if (m_expansion) { | |
| 590 float previousExpansion = m_expansion; | |
| 591 if (!treatAsSpace && !m_afterExpansion) { | |
| 592 // Take the expansion opportunity before this ideogr
aph. | |
| 593 m_expansion -= m_expansionPerOpportunity; | |
| 594 float expansionAtThisOpportunity = !m_run.applyWordR
ounding() ? m_expansionPerOpportunity : roundf(previousExpansion) - roundf(m_exp
ansion); | |
| 595 m_totalWidth += expansionAtThisOpportunity; | |
| 596 if (m_adjustedAdvances.isEmpty()) | |
| 597 m_leadingExpansion = expansionAtThisOpportunity; | |
| 598 else | |
| 599 m_adjustedAdvances.last().width += expansionAtTh
isOpportunity; | |
| 600 previousExpansion = m_expansion; | |
| 601 } | |
| 602 if (!lastGlyph || m_run.allowsTrailingExpansion()) { | |
| 603 m_expansion -= m_expansionPerOpportunity; | |
| 604 advance.width += !m_run.applyWordRounding() ? m_expa
nsionPerOpportunity : roundf(previousExpansion) - roundf(m_expansion); | |
| 605 m_afterExpansion = true; | |
| 606 } | |
| 607 } else | |
| 608 m_afterExpansion = false; | |
| 609 | |
| 610 // Account for word-spacing. | |
| 611 if (treatAsSpace && (ch != '\t' || !m_run.allowTabs()) && (c
haracterIndex > 0 || r > 0) && m_font.fontDescription().wordSpacing()) | |
| 612 advance.width += m_font.fontDescription().wordSpacing(); | |
| 613 } else | |
| 614 m_afterExpansion = false; | |
| 615 } | |
| 616 | |
| 617 // Apply rounding hacks if needed. | |
| 618 // We adjust the width of the last character of a "word" to ensure a
n integer width. | |
| 619 // Force characters that are used to determine word boundaries for t
he rounding hack | |
| 620 // to be integer width, so the following words will start on an inte
ger boundary. | |
| 621 if (m_run.applyWordRounding() && Character::isRoundingHackCharacter(
ch)) | |
| 622 advance.width = ceilCGFloat(advance.width); | |
| 623 | |
| 624 // Check to see if the next character is a "rounding hack character"
, if so, adjust the | |
| 625 // width so that the total run width will be on an integer boundary. | |
| 626 if ((m_run.applyWordRounding() && !lastGlyph && Character::isRoundin
gHackCharacter(nextCh)) || (m_run.applyRunRounding() && lastGlyph)) { | |
| 627 CGFloat totalWidth = widthSinceLastCommit + advance.width; | |
| 628 widthSinceLastCommit = ceilCGFloat(totalWidth); | |
| 629 CGFloat extraWidth = widthSinceLastCommit - totalWidth; | |
| 630 if (m_run.ltr()) | |
| 631 advance.width += extraWidth; | |
| 632 else { | |
| 633 if (m_lastRoundingGlyph) | |
| 634 m_adjustedAdvances[m_lastRoundingGlyph - 1].width += ext
raWidth; | |
| 635 else | |
| 636 m_finalRoundingWidth = extraWidth; | |
| 637 m_lastRoundingGlyph = m_adjustedAdvances.size() + 1; | |
| 638 } | |
| 639 m_totalWidth += widthSinceLastCommit; | |
| 640 widthSinceLastCommit = 0; | |
| 641 } else | |
| 642 widthSinceLastCommit += advance.width; | |
| 643 | |
| 644 // FIXME: Combining marks should receive a text emphasis mark if the
y are combine with a space. | |
| 645 if (m_forTextEmphasis && (!Character::canReceiveTextEmphasis(ch) ||
(U_GET_GC_MASK(ch) & U_GC_M_MASK))) | |
| 646 glyph = 0; | |
| 647 | |
| 648 advance.height *= -1; | |
| 649 m_adjustedAdvances.append(advance); | |
| 650 m_adjustedGlyphs.append(glyph); | |
| 651 | |
| 652 FloatRect glyphBounds = fontData->boundsForGlyph(glyph); | |
| 653 glyphBounds.move(glyphOrigin.x, glyphOrigin.y); | |
| 654 m_minGlyphBoundingBoxX = min(m_minGlyphBoundingBoxX, glyphBounds.x()
); | |
| 655 m_maxGlyphBoundingBoxX = max(m_maxGlyphBoundingBoxX, glyphBounds.max
X()); | |
| 656 m_minGlyphBoundingBoxY = min(m_minGlyphBoundingBoxY, glyphBounds.y()
); | |
| 657 m_maxGlyphBoundingBoxY = max(m_maxGlyphBoundingBoxY, glyphBounds.max
Y()); | |
| 658 glyphOrigin.x += advance.width; | |
| 659 glyphOrigin.y += advance.height; | |
| 660 | |
| 661 lastCharacterIndex = characterIndex; | |
| 662 } | |
| 663 if (!isMonotonic) | |
| 664 complexTextRun.setIsNonMonotonic(); | |
| 665 } | |
| 666 m_totalWidth += widthSinceLastCommit; | |
| 667 } | |
| 668 | |
| 669 } // namespace WebCore | |
| 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