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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 "core/platform/graphics/mac/ComplexTextController.h" | |
| 27 | |
| 28 #include <ApplicationServices/ApplicationServices.h> | |
| 29 #include "core/platform/graphics/Font.h" | |
| 30 #include "platform/geometry/FloatSize.h" | |
| 31 #include "platform/graphics/TextRun.h" | |
| 32 #include "platform/text/TextBreakIterator.h" | |
| 33 #include "wtf/StdLibExtras.h" | |
| 34 #include "wtf/unicode/CharacterNames.h" | |
| 35 | |
| 36 using namespace std; | |
| 37 | |
| 38 namespace WebCore { | |
| 39 | |
| 40 class TextLayout { | |
| 41 public: | |
| 42 static bool isNeeded(const TextRun& run, const Font& font) | |
| 43 { | |
| 44 return font.codePath(run) == Font::Complex; | |
| 45 } | |
| 46 | |
| 47 TextLayout(const TextRun& run, unsigned textLength, const Font& font, float
xPos) | |
| 48 : m_font(font) | |
| 49 , m_run(constructTextRun(run, textLength, font, xPos)) | |
| 50 , m_controller(adoptPtr(new ComplexTextController(&m_font, m_run, true))
) | |
| 51 { | |
| 52 } | |
| 53 | |
| 54 float width(unsigned from, unsigned len, HashSet<const SimpleFontData*>* fal
lbackFonts) | |
| 55 { | |
| 56 m_controller->advance(from, 0, ByWholeGlyphs, fallbackFonts); | |
| 57 float beforeWidth = m_controller->runWidthSoFar(); | |
| 58 if (m_font.wordSpacing() && from && Font::treatAsSpace(m_run[from])) | |
| 59 beforeWidth += m_font.wordSpacing(); | |
| 60 m_controller->advance(from + len, 0, ByWholeGlyphs, fallbackFonts); | |
| 61 float afterWidth = m_controller->runWidthSoFar(); | |
| 62 return afterWidth - beforeWidth; | |
| 63 } | |
| 64 | |
| 65 private: | |
| 66 static TextRun constructTextRun(const TextRun& textRun, unsigned textLength,
const Font& font, float xPos) | |
| 67 { | |
| 68 TextRun run = textRun; | |
| 69 run.setCharactersLength(textLength); | |
| 70 ASSERT(run.charactersLength() >= run.length()); | |
| 71 | |
| 72 run.setXPos(xPos); | |
| 73 return run; | |
| 74 } | |
| 75 | |
| 76 // ComplexTextController has only references to its Font and TextRun so they
must be kept alive here. | |
| 77 Font m_font; | |
| 78 TextRun m_run; | |
| 79 OwnPtr<ComplexTextController> m_controller; | |
| 80 }; | |
| 81 | |
| 82 PassOwnPtr<TextLayout> Font::createLayoutForMacComplexText(const TextRun& run, u
nsigned textLength, float xPos, bool collapseWhiteSpace) const | |
| 83 { | |
| 84 if (!collapseWhiteSpace || !TextLayout::isNeeded(run, *this)) | |
| 85 return nullptr; | |
| 86 return adoptPtr(new TextLayout(run, textLength, *this, xPos)); | |
| 87 } | |
| 88 | |
| 89 void Font::deleteLayout(TextLayout* layout) | |
| 90 { | |
| 91 delete layout; | |
| 92 } | |
| 93 | |
| 94 float Font::width(TextLayout& layout, unsigned from, unsigned len, HashSet<const
SimpleFontData*>* fallbackFonts) | |
| 95 { | |
| 96 return layout.width(from, len, fallbackFonts); | |
| 97 } | |
| 98 | |
| 99 static inline CGFloat roundCGFloat(CGFloat f) | |
| 100 { | |
| 101 if (sizeof(CGFloat) == sizeof(float)) | |
| 102 return roundf(static_cast<float>(f)); | |
| 103 return static_cast<CGFloat>(round(f)); | |
| 104 } | |
| 105 | |
| 106 static inline CGFloat ceilCGFloat(CGFloat f) | |
| 107 { | |
| 108 if (sizeof(CGFloat) == sizeof(float)) | |
| 109 return ceilf(static_cast<float>(f)); | |
| 110 return static_cast<CGFloat>(ceil(f)); | |
| 111 } | |
| 112 | |
| 113 ComplexTextController::ComplexTextController(const Font* font, const TextRun& ru
n, bool mayUseNaturalWritingDirection, HashSet<const SimpleFontData*>* fallbackF
onts, bool forTextEmphasis) | |
| 114 : m_font(*font) | |
| 115 , m_run(run) | |
| 116 , m_isLTROnly(true) | |
| 117 , m_mayUseNaturalWritingDirection(mayUseNaturalWritingDirection) | |
| 118 , m_forTextEmphasis(forTextEmphasis) | |
| 119 , m_currentCharacter(0) | |
| 120 , m_end(run.length()) | |
| 121 , m_totalWidth(0) | |
| 122 , m_runWidthSoFar(0) | |
| 123 , m_numGlyphsSoFar(0) | |
| 124 , m_currentRun(0) | |
| 125 , m_glyphInCurrentRun(0) | |
| 126 , m_characterInCurrentGlyph(0) | |
| 127 , m_finalRoundingWidth(0) | |
| 128 , m_expansion(run.expansion()) | |
| 129 , m_leadingExpansion(0) | |
| 130 , m_afterExpansion(!run.allowsLeadingExpansion()) | |
| 131 , m_fallbackFonts(fallbackFonts) | |
| 132 , m_minGlyphBoundingBoxX(numeric_limits<float>::max()) | |
| 133 , m_maxGlyphBoundingBoxX(numeric_limits<float>::min()) | |
| 134 , m_minGlyphBoundingBoxY(numeric_limits<float>::max()) | |
| 135 , m_maxGlyphBoundingBoxY(numeric_limits<float>::min()) | |
| 136 , m_lastRoundingGlyph(0) | |
| 137 { | |
| 138 if (!m_expansion) | |
| 139 m_expansionPerOpportunity = 0; | |
| 140 else { | |
| 141 bool isAfterExpansion = m_afterExpansion; | |
| 142 unsigned expansionOpportunityCount; | |
| 143 if (m_run.is8Bit()) | |
| 144 expansionOpportunityCount = Font::expansionOpportunityCount(m_run.ch
aracters8(), m_end, m_run.ltr() ? LTR : RTL, isAfterExpansion); | |
| 145 else | |
| 146 expansionOpportunityCount = Font::expansionOpportunityCount(m_run.c
haracters16(), m_end, m_run.ltr() ? LTR : RTL, isAfterExpansion); | |
| 147 if (isAfterExpansion && !m_run.allowsTrailingExpansion()) | |
| 148 expansionOpportunityCount--; | |
| 149 | |
| 150 if (!expansionOpportunityCount) | |
| 151 m_expansionPerOpportunity = 0; | |
| 152 else | |
| 153 m_expansionPerOpportunity = m_expansion / expansionOpportunityCount; | |
| 154 } | |
| 155 | |
| 156 collectComplexTextRuns(); | |
| 157 adjustGlyphsAndAdvances(); | |
| 158 | |
| 159 if (!m_isLTROnly) { | |
| 160 m_runIndices.reserveInitialCapacity(m_complexTextRuns.size()); | |
| 161 | |
| 162 m_glyphCountFromStartToIndex.reserveInitialCapacity(m_complexTextRuns.si
ze()); | |
| 163 unsigned glyphCountSoFar = 0; | |
| 164 for (unsigned i = 0; i < m_complexTextRuns.size(); ++i) { | |
| 165 m_glyphCountFromStartToIndex.uncheckedAppend(glyphCountSoFar); | |
| 166 glyphCountSoFar += m_complexTextRuns[i]->glyphCount(); | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 m_runWidthSoFar = m_leadingExpansion; | |
| 171 } | |
| 172 | |
| 173 int ComplexTextController::offsetForPosition(float h, bool includePartialGlyphs) | |
| 174 { | |
| 175 if (h >= m_totalWidth) | |
| 176 return m_run.ltr() ? m_end : 0; | |
| 177 | |
| 178 h -= m_leadingExpansion; | |
| 179 if (h < 0) | |
| 180 return m_run.ltr() ? 0 : m_end; | |
| 181 | |
| 182 CGFloat x = h; | |
| 183 | |
| 184 size_t runCount = m_complexTextRuns.size(); | |
| 185 size_t offsetIntoAdjustedGlyphs = 0; | |
| 186 | |
| 187 for (size_t r = 0; r < runCount; ++r) { | |
| 188 const ComplexTextRun& complexTextRun = *m_complexTextRuns[r]; | |
| 189 for (unsigned j = 0; j < complexTextRun.glyphCount(); ++j) { | |
| 190 CGFloat adjustedAdvance = m_adjustedAdvances[offsetIntoAdjustedGlyph
s + j].width; | |
| 191 if (x < adjustedAdvance) { | |
| 192 CFIndex hitGlyphStart = complexTextRun.indexAt(j); | |
| 193 CFIndex hitGlyphEnd; | |
| 194 if (m_run.ltr()) | |
| 195 hitGlyphEnd = max<CFIndex>(hitGlyphStart, j + 1 < complexTex
tRun.glyphCount() ? complexTextRun.indexAt(j + 1) : static_cast<CFIndex>(complex
TextRun.indexEnd())); | |
| 196 else | |
| 197 hitGlyphEnd = max<CFIndex>(hitGlyphStart, j > 0 ? complexTex
tRun.indexAt(j - 1) : static_cast<CFIndex>(complexTextRun.indexEnd())); | |
| 198 | |
| 199 // FIXME: Instead of dividing the glyph's advance equally betwee
n the characters, this | |
| 200 // could use the glyph's "ligature carets". However, there is no
Core Text API to get the | |
| 201 // ligature carets. | |
| 202 CFIndex hitIndex = hitGlyphStart + (hitGlyphEnd - hitGlyphStart)
* (m_run.ltr() ? x / adjustedAdvance : 1 - x / adjustedAdvance); | |
| 203 int stringLength = complexTextRun.stringLength(); | |
| 204 TextBreakIterator* cursorPositionIterator = cursorMovementIterat
or(complexTextRun.characters(), stringLength); | |
| 205 int clusterStart; | |
| 206 if (cursorPositionIterator->isBoundary(hitIndex)) | |
| 207 clusterStart = hitIndex; | |
| 208 else { | |
| 209 clusterStart = cursorPositionIterator->preceding(hitIndex); | |
| 210 if (clusterStart == TextBreakDone) | |
| 211 clusterStart = 0; | |
| 212 } | |
| 213 | |
| 214 if (!includePartialGlyphs) | |
| 215 return complexTextRun.stringLocation() + clusterStart; | |
| 216 | |
| 217 int clusterEnd = cursorPositionIterator->following(hitIndex); | |
| 218 if (clusterEnd == TextBreakDone) | |
| 219 clusterEnd = stringLength; | |
| 220 | |
| 221 CGFloat clusterWidth; | |
| 222 // FIXME: The search stops at the boundaries of complexTextRun.
In theory, it should go on into neighboring ComplexTextRuns | |
| 223 // derived from the same CTLine. In practice, we do not expect t
here to be more than one CTRun in a CTLine, as no | |
| 224 // reordering and no font fallback should occur within a CTLine. | |
| 225 if (clusterEnd - clusterStart > 1) { | |
| 226 clusterWidth = adjustedAdvance; | |
| 227 int firstGlyphBeforeCluster = j - 1; | |
| 228 while (firstGlyphBeforeCluster >= 0 && complexTextRun.indexA
t(firstGlyphBeforeCluster) >= clusterStart && complexTextRun.indexAt(firstGlyphB
eforeCluster) < clusterEnd) { | |
| 229 CGFloat width = m_adjustedAdvances[offsetIntoAdjustedGly
phs + firstGlyphBeforeCluster].width; | |
| 230 clusterWidth += width; | |
| 231 x += width; | |
| 232 firstGlyphBeforeCluster--; | |
| 233 } | |
| 234 unsigned firstGlyphAfterCluster = j + 1; | |
| 235 while (firstGlyphAfterCluster < complexTextRun.glyphCount()
&& complexTextRun.indexAt(firstGlyphAfterCluster) >= clusterStart && complexText
Run.indexAt(firstGlyphAfterCluster) < clusterEnd) { | |
| 236 clusterWidth += m_adjustedAdvances[offsetIntoAdjustedGly
phs + firstGlyphAfterCluster].width; | |
| 237 firstGlyphAfterCluster++; | |
| 238 } | |
| 239 } else { | |
| 240 clusterWidth = adjustedAdvance / (hitGlyphEnd - hitGlyphStar
t); | |
| 241 x -= clusterWidth * (m_run.ltr() ? hitIndex - hitGlyphStart
: hitGlyphEnd - hitIndex - 1); | |
| 242 } | |
| 243 if (x <= clusterWidth / 2) | |
| 244 return complexTextRun.stringLocation() + (m_run.ltr() ? clus
terStart : clusterEnd); | |
| 245 else | |
| 246 return complexTextRun.stringLocation() + (m_run.ltr() ? clus
terEnd : clusterStart); | |
| 247 } | |
| 248 x -= adjustedAdvance; | |
| 249 } | |
| 250 offsetIntoAdjustedGlyphs += complexTextRun.glyphCount(); | |
| 251 } | |
| 252 | |
| 253 ASSERT_NOT_REACHED(); | |
| 254 return 0; | |
| 255 } | |
| 256 | |
| 257 static bool advanceByCombiningCharacterSequence(const UChar*& iterator, const UC
har* end, UChar32& baseCharacter, unsigned& markCount) | |
| 258 { | |
| 259 ASSERT(iterator < end); | |
| 260 | |
| 261 markCount = 0; | |
| 262 | |
| 263 baseCharacter = *iterator++; | |
| 264 | |
| 265 if (U16_IS_SURROGATE(baseCharacter)) { | |
| 266 if (!U16_IS_LEAD(baseCharacter)) | |
| 267 return false; | |
| 268 if (iterator == end) | |
| 269 return false; | |
| 270 UChar trail = *iterator++; | |
| 271 if (!U16_IS_TRAIL(trail)) | |
| 272 return false; | |
| 273 baseCharacter = U16_GET_SUPPLEMENTARY(baseCharacter, trail); | |
| 274 } | |
| 275 | |
| 276 // Consume marks. | |
| 277 while (iterator < end) { | |
| 278 UChar32 nextCharacter; | |
| 279 int markLength = 0; | |
| 280 U16_NEXT(iterator, markLength, end - iterator, nextCharacter); | |
| 281 if (!(U_GET_GC_MASK(nextCharacter) & U_GC_M_MASK)) | |
| 282 break; | |
| 283 markCount += markLength; | |
| 284 iterator += markLength; | |
| 285 } | |
| 286 | |
| 287 return true; | |
| 288 } | |
| 289 | |
| 290 void ComplexTextController::collectComplexTextRuns() | |
| 291 { | |
| 292 if (!m_end) | |
| 293 return; | |
| 294 | |
| 295 // We break up glyph run generation for the string by FontData. | |
| 296 const UChar* cp; | |
| 297 | |
| 298 if (m_run.is8Bit()) { | |
| 299 String stringFor8BitRun = String::make16BitFrom8BitSource(m_run.characte
rs8(), m_run.length()); | |
| 300 cp = stringFor8BitRun.characters16(); | |
| 301 m_stringsFor8BitRuns.append(stringFor8BitRun); | |
| 302 } else | |
| 303 cp = m_run.characters16(); | |
| 304 | |
| 305 if (m_font.isSmallCaps()) | |
| 306 m_smallCapsBuffer.resize(m_end); | |
| 307 | |
| 308 unsigned indexOfFontTransition = 0; | |
| 309 const UChar* curr = cp; | |
| 310 const UChar* end = cp + m_end; | |
| 311 | |
| 312 const SimpleFontData* fontData; | |
| 313 bool isMissingGlyph; | |
| 314 const SimpleFontData* nextFontData; | |
| 315 bool nextIsMissingGlyph; | |
| 316 | |
| 317 unsigned markCount; | |
| 318 const UChar* sequenceStart = curr; | |
| 319 UChar32 baseCharacter; | |
| 320 if (!advanceByCombiningCharacterSequence(curr, end, baseCharacter, markCount
)) | |
| 321 return; | |
| 322 | |
| 323 UChar uppercaseCharacter = 0; | |
| 324 | |
| 325 bool isSmallCaps; | |
| 326 bool nextIsSmallCaps = m_font.isSmallCaps() && !(U_GET_GC_MASK(baseCharacter
) & U_GC_M_MASK) && (uppercaseCharacter = u_toupper(baseCharacter)) != baseChara
cter; | |
| 327 | |
| 328 if (nextIsSmallCaps) { | |
| 329 m_smallCapsBuffer[sequenceStart - cp] = uppercaseCharacter; | |
| 330 for (unsigned i = 0; i < markCount; ++i) | |
| 331 m_smallCapsBuffer[sequenceStart - cp + i + 1] = sequenceStart[i + 1]
; | |
| 332 } | |
| 333 | |
| 334 nextIsMissingGlyph = false; | |
| 335 nextFontData = m_font.fontDataForCombiningCharacterSequence(sequenceStart, c
urr - sequenceStart, nextIsSmallCaps ? SmallCapsVariant : NormalVariant); | |
| 336 if (!nextFontData) | |
| 337 nextIsMissingGlyph = true; | |
| 338 | |
| 339 while (curr < end) { | |
| 340 fontData = nextFontData; | |
| 341 isMissingGlyph = nextIsMissingGlyph; | |
| 342 isSmallCaps = nextIsSmallCaps; | |
| 343 int index = curr - cp; | |
| 344 | |
| 345 if (!advanceByCombiningCharacterSequence(curr, end, baseCharacter, markC
ount)) | |
| 346 return; | |
| 347 | |
| 348 if (m_font.isSmallCaps()) { | |
| 349 nextIsSmallCaps = (uppercaseCharacter = u_toupper(baseCharacter)) !=
baseCharacter; | |
| 350 if (nextIsSmallCaps) { | |
| 351 m_smallCapsBuffer[index] = uppercaseCharacter; | |
| 352 for (unsigned i = 0; i < markCount; ++i) | |
| 353 m_smallCapsBuffer[index + i + 1] = cp[index + i + 1]; | |
| 354 } | |
| 355 } | |
| 356 | |
| 357 nextIsMissingGlyph = false; | |
| 358 if (baseCharacter == zeroWidthJoiner) | |
| 359 nextFontData = fontData; | |
| 360 else { | |
| 361 nextFontData = m_font.fontDataForCombiningCharacterSequence(cp + ind
ex, curr - cp - index, nextIsSmallCaps ? SmallCapsVariant : NormalVariant); | |
| 362 if (!nextFontData) | |
| 363 nextIsMissingGlyph = true; | |
| 364 } | |
| 365 | |
| 366 if (nextFontData != fontData || nextIsMissingGlyph != isMissingGlyph) { | |
| 367 int itemStart = static_cast<int>(indexOfFontTransition); | |
| 368 int itemLength = index - indexOfFontTransition; | |
| 369 collectComplexTextRunsForCharacters((isSmallCaps ? m_smallCapsBuffer
.data() : cp) + itemStart, itemLength, itemStart, !isMissingGlyph ? fontData : 0
); | |
| 370 indexOfFontTransition = index; | |
| 371 } | |
| 372 } | |
| 373 | |
| 374 int itemLength = m_end - indexOfFontTransition; | |
| 375 if (itemLength) { | |
| 376 int itemStart = indexOfFontTransition; | |
| 377 collectComplexTextRunsForCharacters((nextIsSmallCaps ? m_smallCapsBuffer
.data() : cp) + itemStart, itemLength, itemStart, !nextIsMissingGlyph ? nextFont
Data : 0); | |
| 378 } | |
| 379 | |
| 380 if (!m_run.ltr()) | |
| 381 m_complexTextRuns.reverse(); | |
| 382 } | |
| 383 | |
| 384 CFIndex ComplexTextController::ComplexTextRun::indexAt(size_t i) const | |
| 385 { | |
| 386 return m_coreTextIndices[i]; | |
| 387 } | |
| 388 | |
| 389 void ComplexTextController::ComplexTextRun::setIsNonMonotonic() | |
| 390 { | |
| 391 ASSERT(m_isMonotonic); | |
| 392 m_isMonotonic = false; | |
| 393 | |
| 394 Vector<bool, 64> mappedIndices(m_stringLength); | |
| 395 for (size_t i = 0; i < m_glyphCount; ++i) { | |
| 396 ASSERT(indexAt(i) < static_cast<CFIndex>(m_stringLength)); | |
| 397 mappedIndices[indexAt(i)] = true; | |
| 398 } | |
| 399 | |
| 400 m_glyphEndOffsets.grow(m_glyphCount); | |
| 401 for (size_t i = 0; i < m_glyphCount; ++i) { | |
| 402 CFIndex nextMappedIndex = m_indexEnd; | |
| 403 for (size_t j = indexAt(i) + 1; j < m_stringLength; ++j) { | |
| 404 if (mappedIndices[j]) { | |
| 405 nextMappedIndex = j; | |
| 406 break; | |
| 407 } | |
| 408 } | |
| 409 m_glyphEndOffsets[i] = nextMappedIndex; | |
| 410 } | |
| 411 } | |
| 412 | |
| 413 unsigned ComplexTextController::findNextRunIndex(unsigned runIndex) const | |
| 414 { | |
| 415 const unsigned runOffset = stringEnd(*m_complexTextRuns[runIndex]); | |
| 416 | |
| 417 // Finds the run with the lowest stringBegin() offset that starts at or | |
| 418 // after |runOffset|. | |
| 419 // | |
| 420 // Note that this can't just find a run whose stringBegin() equals the | |
| 421 // stringEnd() of the previous run because CoreText on Mac OS X 10.6 does | |
| 422 // not return runs covering BiDi control chars, so this has to handle the | |
| 423 // resulting gaps. | |
| 424 unsigned result = 0; | |
| 425 unsigned lowestOffset = UINT_MAX; | |
| 426 for (unsigned i = 0; i < m_complexTextRuns.size(); ++i) { | |
| 427 unsigned offset = stringBegin(*m_complexTextRuns[i]); | |
| 428 if (i != runIndex && offset >= runOffset && offset < lowestOffset) { | |
| 429 lowestOffset = offset; | |
| 430 result = i; | |
| 431 } | |
| 432 } | |
| 433 | |
| 434 ASSERT(lowestOffset != UINT_MAX); | |
| 435 return result; | |
| 436 } | |
| 437 | |
| 438 unsigned ComplexTextController::indexOfCurrentRun(unsigned& leftmostGlyph) | |
| 439 { | |
| 440 leftmostGlyph = 0; | |
| 441 | |
| 442 size_t runCount = m_complexTextRuns.size(); | |
| 443 if (m_currentRun >= runCount) | |
| 444 return runCount; | |
| 445 | |
| 446 if (m_isLTROnly) { | |
| 447 for (unsigned i = 0; i < m_currentRun; ++i) | |
| 448 leftmostGlyph += m_complexTextRuns[i]->glyphCount(); | |
| 449 return m_currentRun; | |
| 450 } | |
| 451 | |
| 452 if (m_runIndices.isEmpty()) { | |
| 453 unsigned firstRun = 0; | |
| 454 unsigned firstRunOffset = stringBegin(*m_complexTextRuns[0]); | |
| 455 for (unsigned i = 1; i < runCount; ++i) { | |
| 456 unsigned offset = stringBegin(*m_complexTextRuns[i]); | |
| 457 if (offset < firstRunOffset) { | |
| 458 firstRun = i; | |
| 459 firstRunOffset = offset; | |
| 460 } | |
| 461 } | |
| 462 m_runIndices.uncheckedAppend(firstRun); | |
| 463 } | |
| 464 | |
| 465 while (m_runIndices.size() <= m_currentRun) { | |
| 466 m_runIndices.uncheckedAppend(findNextRunIndex(m_runIndices.last())); | |
| 467 } | |
| 468 | |
| 469 unsigned currentRunIndex = m_runIndices[m_currentRun]; | |
| 470 leftmostGlyph = m_glyphCountFromStartToIndex[currentRunIndex]; | |
| 471 return currentRunIndex; | |
| 472 } | |
| 473 | |
| 474 unsigned ComplexTextController::incrementCurrentRun(unsigned& leftmostGlyph) | |
| 475 { | |
| 476 if (m_isLTROnly) { | |
| 477 leftmostGlyph += m_complexTextRuns[m_currentRun++]->glyphCount(); | |
| 478 return m_currentRun; | |
| 479 } | |
| 480 | |
| 481 m_currentRun++; | |
| 482 leftmostGlyph = 0; | |
| 483 return indexOfCurrentRun(leftmostGlyph); | |
| 484 } | |
| 485 | |
| 486 void ComplexTextController::advance(unsigned offset, GlyphBuffer* glyphBuffer, G
lyphIterationStyle iterationStyle, HashSet<const SimpleFontData*>* fallbackFonts
) | |
| 487 { | |
| 488 if (static_cast<int>(offset) > m_end) | |
| 489 offset = m_end; | |
| 490 | |
| 491 if (offset <= m_currentCharacter) { | |
| 492 m_runWidthSoFar = m_leadingExpansion; | |
| 493 m_numGlyphsSoFar = 0; | |
| 494 m_currentRun = 0; | |
| 495 m_glyphInCurrentRun = 0; | |
| 496 m_characterInCurrentGlyph = 0; | |
| 497 } | |
| 498 | |
| 499 m_currentCharacter = offset; | |
| 500 | |
| 501 size_t runCount = m_complexTextRuns.size(); | |
| 502 | |
| 503 unsigned leftmostGlyph = 0; | |
| 504 unsigned currentRunIndex = indexOfCurrentRun(leftmostGlyph); | |
| 505 while (m_currentRun < runCount) { | |
| 506 const ComplexTextRun& complexTextRun = *m_complexTextRuns[currentRunInde
x]; | |
| 507 bool ltr = complexTextRun.isLTR(); | |
| 508 size_t glyphCount = complexTextRun.glyphCount(); | |
| 509 unsigned g = ltr ? m_glyphInCurrentRun : glyphCount - 1 - m_glyphInCurre
ntRun; | |
| 510 unsigned k = leftmostGlyph + g; | |
| 511 if (fallbackFonts && complexTextRun.fontData() != m_font.primaryFont()) | |
| 512 fallbackFonts->add(complexTextRun.fontData()); | |
| 513 | |
| 514 while (m_glyphInCurrentRun < glyphCount) { | |
| 515 unsigned glyphStartOffset = complexTextRun.indexAt(g); | |
| 516 unsigned glyphEndOffset; | |
| 517 if (complexTextRun.isMonotonic()) { | |
| 518 if (ltr) | |
| 519 glyphEndOffset = max<unsigned>(glyphStartOffset, static_cast
<unsigned>(g + 1 < glyphCount ? complexTextRun.indexAt(g + 1) : complexTextRun.i
ndexEnd())); | |
| 520 else | |
| 521 glyphEndOffset = max<unsigned>(glyphStartOffset, static_cast
<unsigned>(g > 0 ? complexTextRun.indexAt(g - 1) : complexTextRun.indexEnd())); | |
| 522 } else | |
| 523 glyphEndOffset = complexTextRun.endOffsetAt(g); | |
| 524 | |
| 525 CGSize adjustedAdvance = m_adjustedAdvances[k]; | |
| 526 | |
| 527 if (glyphStartOffset + complexTextRun.stringLocation() >= m_currentC
haracter) | |
| 528 return; | |
| 529 | |
| 530 if (glyphBuffer && !m_characterInCurrentGlyph) | |
| 531 glyphBuffer->add(m_adjustedGlyphs[k], complexTextRun.fontData(),
adjustedAdvance); | |
| 532 | |
| 533 unsigned oldCharacterInCurrentGlyph = m_characterInCurrentGlyph; | |
| 534 m_characterInCurrentGlyph = min(m_currentCharacter - complexTextRun.
stringLocation(), glyphEndOffset) - glyphStartOffset; | |
| 535 // FIXME: Instead of dividing the glyph's advance equally between th
e characters, this | |
| 536 // could use the glyph's "ligature carets". However, there is no Cor
e Text API to get the | |
| 537 // ligature carets. | |
| 538 if (glyphStartOffset == glyphEndOffset) { | |
| 539 // When there are multiple glyphs per character we need to advan
ce by the full width of the glyph. | |
| 540 ASSERT(m_characterInCurrentGlyph == oldCharacterInCurrentGlyph); | |
| 541 m_runWidthSoFar += adjustedAdvance.width; | |
| 542 } else if (iterationStyle == ByWholeGlyphs) { | |
| 543 if (!oldCharacterInCurrentGlyph) | |
| 544 m_runWidthSoFar += adjustedAdvance.width; | |
| 545 } else | |
| 546 m_runWidthSoFar += adjustedAdvance.width * (m_characterInCurrent
Glyph - oldCharacterInCurrentGlyph) / (glyphEndOffset - glyphStartOffset); | |
| 547 | |
| 548 if (glyphEndOffset + complexTextRun.stringLocation() > m_currentChar
acter) | |
| 549 return; | |
| 550 | |
| 551 m_numGlyphsSoFar++; | |
| 552 m_glyphInCurrentRun++; | |
| 553 m_characterInCurrentGlyph = 0; | |
| 554 if (ltr) { | |
| 555 g++; | |
| 556 k++; | |
| 557 } else { | |
| 558 g--; | |
| 559 k--; | |
| 560 } | |
| 561 } | |
| 562 currentRunIndex = incrementCurrentRun(leftmostGlyph); | |
| 563 m_glyphInCurrentRun = 0; | |
| 564 } | |
| 565 if (!m_run.ltr() && m_numGlyphsSoFar == m_adjustedAdvances.size()) | |
| 566 m_runWidthSoFar += m_finalRoundingWidth; | |
| 567 } | |
| 568 | |
| 569 void ComplexTextController::adjustGlyphsAndAdvances() | |
| 570 { | |
| 571 CGFloat widthSinceLastCommit = 0; | |
| 572 size_t runCount = m_complexTextRuns.size(); | |
| 573 bool hasExtraSpacing = (m_font.letterSpacing() || m_font.wordSpacing() || m_
expansion) && !m_run.spacingDisabled(); | |
| 574 for (size_t r = 0; r < runCount; ++r) { | |
| 575 ComplexTextRun& complexTextRun = *m_complexTextRuns[r]; | |
| 576 unsigned glyphCount = complexTextRun.glyphCount(); | |
| 577 const SimpleFontData* fontData = complexTextRun.fontData(); | |
| 578 | |
| 579 if (!complexTextRun.isLTR()) | |
| 580 m_isLTROnly = false; | |
| 581 | |
| 582 const CGGlyph* glyphs = complexTextRun.glyphs(); | |
| 583 const CGSize* advances = complexTextRun.advances(); | |
| 584 | |
| 585 bool lastRun = r + 1 == runCount; | |
| 586 bool roundsAdvances = !m_font.isPrinterFont() && fontData->platformData(
).roundsGlyphAdvances(); | |
| 587 float spaceWidth = fontData->spaceWidth() - fontData->syntheticBoldOffse
t(); | |
| 588 CGFloat roundedSpaceWidth = roundCGFloat(spaceWidth); | |
| 589 const UChar* cp = complexTextRun.characters(); | |
| 590 CGPoint glyphOrigin = CGPointZero; | |
| 591 CFIndex lastCharacterIndex = m_run.ltr() ? numeric_limits<CFIndex>::min(
) : numeric_limits<CFIndex>::max(); | |
| 592 bool isMonotonic = true; | |
| 593 | |
| 594 for (unsigned i = 0; i < glyphCount; i++) { | |
| 595 CFIndex characterIndex = complexTextRun.indexAt(i); | |
| 596 if (m_run.ltr()) { | |
| 597 if (characterIndex < lastCharacterIndex) | |
| 598 isMonotonic = false; | |
| 599 } else { | |
| 600 if (characterIndex > lastCharacterIndex) | |
| 601 isMonotonic = false; | |
| 602 } | |
| 603 UChar ch = *(cp + characterIndex); | |
| 604 bool lastGlyph = lastRun && i + 1 == glyphCount; | |
| 605 UChar nextCh; | |
| 606 if (lastGlyph) | |
| 607 nextCh = ' '; | |
| 608 else if (i + 1 < glyphCount) | |
| 609 nextCh = *(cp + complexTextRun.indexAt(i + 1)); | |
| 610 else | |
| 611 nextCh = *(m_complexTextRuns[r + 1]->characters() + m_complexTex
tRuns[r + 1]->indexAt(0)); | |
| 612 | |
| 613 bool treatAsSpace = Font::treatAsSpace(ch); | |
| 614 CGGlyph glyph = treatAsSpace ? fontData->spaceGlyph() : glyphs[i]; | |
| 615 CGSize advance = treatAsSpace ? CGSizeMake(spaceWidth, advances[i].h
eight) : advances[i]; | |
| 616 | |
| 617 if (ch == '\t' && m_run.allowTabs()) | |
| 618 advance.width = m_font.tabWidth(*fontData, m_run.tabSize(), m_ru
n.xPos() + m_totalWidth + widthSinceLastCommit); | |
| 619 else if (Font::treatAsZeroWidthSpace(ch) && !treatAsSpace) { | |
| 620 advance.width = 0; | |
| 621 glyph = fontData->spaceGlyph(); | |
| 622 } | |
| 623 | |
| 624 float roundedAdvanceWidth = roundf(advance.width); | |
| 625 if (roundsAdvances) | |
| 626 advance.width = roundedAdvanceWidth; | |
| 627 | |
| 628 advance.width += fontData->syntheticBoldOffset(); | |
| 629 | |
| 630 | |
| 631 // We special case spaces in two ways when applying word rounding. | |
| 632 // First, we round spaces to an adjusted width in all fonts. | |
| 633 // Second, in fixed-pitch fonts we ensure that all glyphs that | |
| 634 // match the width of the space glyph have the same width as the spa
ce glyph. | |
| 635 if (m_run.applyWordRounding() && roundedAdvanceWidth == roundedSpace
Width && (fontData->pitch() == FixedPitch || glyph == fontData->spaceGlyph())) | |
| 636 advance.width = fontData->adjustedSpaceWidth(); | |
| 637 | |
| 638 if (hasExtraSpacing) { | |
| 639 // If we're a glyph with an advance, go ahead and add in letter-
spacing. | |
| 640 // That way we weed out zero width lurkers. This behavior match
es the fast text code path. | |
| 641 if (advance.width && m_font.letterSpacing()) | |
| 642 advance.width += m_font.letterSpacing(); | |
| 643 | |
| 644 // Handle justification and word-spacing. | |
| 645 if (treatAsSpace || Font::isCJKIdeographOrSymbol(ch)) { | |
| 646 // Distribute the run's total expansion evenly over all expa
nsion opportunities in the run. | |
| 647 if (m_expansion) { | |
| 648 float previousExpansion = m_expansion; | |
| 649 if (!treatAsSpace && !m_afterExpansion) { | |
| 650 // Take the expansion opportunity before this ideogr
aph. | |
| 651 m_expansion -= m_expansionPerOpportunity; | |
| 652 float expansionAtThisOpportunity = !m_run.applyWordR
ounding() ? m_expansionPerOpportunity : roundf(previousExpansion) - roundf(m_exp
ansion); | |
| 653 m_totalWidth += expansionAtThisOpportunity; | |
| 654 if (m_adjustedAdvances.isEmpty()) | |
| 655 m_leadingExpansion = expansionAtThisOpportunity; | |
| 656 else | |
| 657 m_adjustedAdvances.last().width += expansionAtTh
isOpportunity; | |
| 658 previousExpansion = m_expansion; | |
| 659 } | |
| 660 if (!lastGlyph || m_run.allowsTrailingExpansion()) { | |
| 661 m_expansion -= m_expansionPerOpportunity; | |
| 662 advance.width += !m_run.applyWordRounding() ? m_expa
nsionPerOpportunity : roundf(previousExpansion) - roundf(m_expansion); | |
| 663 m_afterExpansion = true; | |
| 664 } | |
| 665 } else | |
| 666 m_afterExpansion = false; | |
| 667 | |
| 668 // Account for word-spacing. | |
| 669 if (treatAsSpace && (ch != '\t' || !m_run.allowTabs()) && (c
haracterIndex > 0 || r > 0) && m_font.wordSpacing()) | |
| 670 advance.width += m_font.wordSpacing(); | |
| 671 } else | |
| 672 m_afterExpansion = false; | |
| 673 } | |
| 674 | |
| 675 // Apply rounding hacks if needed. | |
| 676 // We adjust the width of the last character of a "word" to ensure a
n integer width. | |
| 677 // Force characters that are used to determine word boundaries for t
he rounding hack | |
| 678 // to be integer width, so the following words will start on an inte
ger boundary. | |
| 679 if (m_run.applyWordRounding() && Font::isRoundingHackCharacter(ch)) | |
| 680 advance.width = ceilCGFloat(advance.width); | |
| 681 | |
| 682 // Check to see if the next character is a "rounding hack character"
, if so, adjust the | |
| 683 // width so that the total run width will be on an integer boundary. | |
| 684 if ((m_run.applyWordRounding() && !lastGlyph && Font::isRoundingHack
Character(nextCh)) || (m_run.applyRunRounding() && lastGlyph)) { | |
| 685 CGFloat totalWidth = widthSinceLastCommit + advance.width; | |
| 686 widthSinceLastCommit = ceilCGFloat(totalWidth); | |
| 687 CGFloat extraWidth = widthSinceLastCommit - totalWidth; | |
| 688 if (m_run.ltr()) | |
| 689 advance.width += extraWidth; | |
| 690 else { | |
| 691 if (m_lastRoundingGlyph) | |
| 692 m_adjustedAdvances[m_lastRoundingGlyph - 1].width += ext
raWidth; | |
| 693 else | |
| 694 m_finalRoundingWidth = extraWidth; | |
| 695 m_lastRoundingGlyph = m_adjustedAdvances.size() + 1; | |
| 696 } | |
| 697 m_totalWidth += widthSinceLastCommit; | |
| 698 widthSinceLastCommit = 0; | |
| 699 } else | |
| 700 widthSinceLastCommit += advance.width; | |
| 701 | |
| 702 // FIXME: Combining marks should receive a text emphasis mark if the
y are combine with a space. | |
| 703 if (m_forTextEmphasis && (!Font::canReceiveTextEmphasis(ch) || (U_GE
T_GC_MASK(ch) & U_GC_M_MASK))) | |
| 704 glyph = 0; | |
| 705 | |
| 706 advance.height *= -1; | |
| 707 m_adjustedAdvances.append(advance); | |
| 708 m_adjustedGlyphs.append(glyph); | |
| 709 | |
| 710 FloatRect glyphBounds = fontData->boundsForGlyph(glyph); | |
| 711 glyphBounds.move(glyphOrigin.x, glyphOrigin.y); | |
| 712 m_minGlyphBoundingBoxX = min(m_minGlyphBoundingBoxX, glyphBounds.x()
); | |
| 713 m_maxGlyphBoundingBoxX = max(m_maxGlyphBoundingBoxX, glyphBounds.max
X()); | |
| 714 m_minGlyphBoundingBoxY = min(m_minGlyphBoundingBoxY, glyphBounds.y()
); | |
| 715 m_maxGlyphBoundingBoxY = max(m_maxGlyphBoundingBoxY, glyphBounds.max
Y()); | |
| 716 glyphOrigin.x += advance.width; | |
| 717 glyphOrigin.y += advance.height; | |
| 718 | |
| 719 lastCharacterIndex = characterIndex; | |
| 720 } | |
| 721 if (!isMonotonic) | |
| 722 complexTextRun.setIsNonMonotonic(); | |
| 723 } | |
| 724 m_totalWidth += widthSinceLastCommit; | |
| 725 } | |
| 726 | |
| 727 } // namespace WebCore | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk