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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 <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 | |
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