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1 /* | 1 /* |
2 * Copyright (C) 2003, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserv
ed. | 2 * Copyright (C) 2003, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserv
ed. |
3 * Copyright (C) 2008 Holger Hans Peter Freyther | 3 * Copyright (C) 2008 Holger Hans Peter Freyther |
4 * | 4 * |
5 * This library is free software; you can redistribute it and/or | 5 * This library is free software; you can redistribute it and/or |
6 * modify it under the terms of the GNU Library General Public | 6 * modify it under the terms of the GNU Library General Public |
7 * License as published by the Free Software Foundation; either | 7 * License as published by the Free Software Foundation; either |
8 * version 2 of the License, or (at your option) any later version. | 8 * version 2 of the License, or (at your option) any later version. |
9 * | 9 * |
10 * This library is distributed in the hope that it will be useful, | 10 * This library is distributed in the hope that it will be useful, |
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42 , m_isAfterExpansion(!run.allowsLeadingExpansion()) | 42 , m_isAfterExpansion(!run.allowsLeadingExpansion()) |
43 , m_finalRoundingWidth(0) | 43 , m_finalRoundingWidth(0) |
44 , m_typesettingFeatures(font->typesettingFeatures()) | 44 , m_typesettingFeatures(font->typesettingFeatures()) |
45 , m_fallbackFonts(fallbackFonts) | 45 , m_fallbackFonts(fallbackFonts) |
46 , m_accountForGlyphBounds(accountForGlyphBounds) | 46 , m_accountForGlyphBounds(accountForGlyphBounds) |
47 , m_maxGlyphBoundingBoxY(numeric_limits<float>::min()) | 47 , m_maxGlyphBoundingBoxY(numeric_limits<float>::min()) |
48 , m_minGlyphBoundingBoxY(numeric_limits<float>::max()) | 48 , m_minGlyphBoundingBoxY(numeric_limits<float>::max()) |
49 , m_firstGlyphOverflow(0) | 49 , m_firstGlyphOverflow(0) |
50 , m_lastGlyphOverflow(0) | 50 , m_lastGlyphOverflow(0) |
51 , m_forTextEmphasis(forTextEmphasis) | 51 , m_forTextEmphasis(forTextEmphasis) |
52 , m_distributeJustification(false) | |
53 { | 52 { |
54 // If the padding is non-zero, count the number of spaces in the run | 53 // If the padding is non-zero, count the number of spaces in the run |
55 // and divide that by the padding for per space addition. | 54 // and divide that by the padding for per space addition. |
56 m_expansion = m_run.expansion(); | 55 m_expansion = m_run.expansion(); |
57 m_distributeJustification = m_run.isDistributeJustification(); | |
58 if (!m_expansion) | 56 if (!m_expansion) |
59 m_expansionPerOpportunity = 0; | 57 m_expansionPerOpportunity = 0; |
60 else { | 58 else { |
61 bool isAfterExpansion = m_isAfterExpansion; | 59 bool isAfterExpansion = m_isAfterExpansion; |
62 unsigned expansionOpportunityCount = m_run.is8Bit() ? Font::expansionOpp
ortunityCount(m_run.characters8(), m_run.length(), m_run.ltr() ? LTR : RTL, isAf
terExpansion, m_distributeJustification) : Font::expansionOpportunityCount(m_run
.characters16(), m_run.length(), m_run.ltr() ? LTR : RTL, isAfterExpansion, m_di
stributeJustification); | 60 unsigned expansionOpportunityCount = m_run.is8Bit() ? Font::expansionOpp
ortunityCount(m_run.characters8(), m_run.length(), m_run.ltr() ? LTR : RTL, isAf
terExpansion) : Font::expansionOpportunityCount(m_run.characters16(), m_run.leng
th(), m_run.ltr() ? LTR : RTL, isAfterExpansion); |
63 | |
64 if (isAfterExpansion && !m_run.allowsTrailingExpansion()) | 61 if (isAfterExpansion && !m_run.allowsTrailingExpansion()) |
65 expansionOpportunityCount--; | 62 expansionOpportunityCount--; |
66 | 63 |
67 if (!expansionOpportunityCount) | 64 if (!expansionOpportunityCount) |
68 m_expansionPerOpportunity = 0; | 65 m_expansionPerOpportunity = 0; |
69 else | 66 else |
70 m_expansionPerOpportunity = m_expansion / expansionOpportunityCount; | 67 m_expansionPerOpportunity = m_expansion / expansionOpportunityCount; |
71 } | 68 } |
72 } | 69 } |
73 | 70 |
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202 } | 199 } |
203 } | 200 } |
204 } | 201 } |
205 | 202 |
206 if (hasExtraSpacing) { | 203 if (hasExtraSpacing) { |
207 // Account for letter-spacing. | 204 // Account for letter-spacing. |
208 if (width && m_font->letterSpacing()) | 205 if (width && m_font->letterSpacing()) |
209 width += m_font->letterSpacing(); | 206 width += m_font->letterSpacing(); |
210 | 207 |
211 static bool expandAroundIdeographs = Font::canExpandAroundIdeographs
InComplexText(); | 208 static bool expandAroundIdeographs = Font::canExpandAroundIdeographs
InComplexText(); |
212 bool isExpansionOpportunity = Font::treatAsSpace(character) || m_dis
tributeJustification; | 209 bool treatAsSpace = Font::treatAsSpace(character); |
213 if (isExpansionOpportunity || (expandAroundIdeographs && Font::isCJK
IdeographOrSymbol(character))) { | 210 if (treatAsSpace || (expandAroundIdeographs && Font::isCJKIdeographO
rSymbol(character))) { |
214 // Distribute the run's total expansion evenly over all expansio
n opportunities in the run. | 211 // Distribute the run's total expansion evenly over all expansio
n opportunities in the run. |
215 if (m_expansion) { | 212 if (m_expansion) { |
216 float previousExpansion = m_expansion; | 213 float previousExpansion = m_expansion; |
217 if (!isExpansionOpportunity && !m_isAfterExpansion) { | 214 if (!treatAsSpace && !m_isAfterExpansion) { |
218 // Take the expansion opportunity before this ideograph. | 215 // Take the expansion opportunity before this ideograph. |
219 m_expansion -= m_expansionPerOpportunity; | 216 m_expansion -= m_expansionPerOpportunity; |
220 float expansionAtThisOpportunity = !m_run.applyWordRound
ing() ? m_expansionPerOpportunity : roundf(previousExpansion) - roundf(m_expansi
on); | 217 float expansionAtThisOpportunity = !m_run.applyWordRound
ing() ? m_expansionPerOpportunity : roundf(previousExpansion) - roundf(m_expansi
on); |
221 m_runWidthSoFar += expansionAtThisOpportunity; | 218 m_runWidthSoFar += expansionAtThisOpportunity; |
222 if (glyphBuffer) { | 219 if (glyphBuffer) { |
223 if (glyphBuffer->isEmpty()) { | 220 if (glyphBuffer->isEmpty()) { |
224 if (m_forTextEmphasis) | 221 if (m_forTextEmphasis) |
225 glyphBuffer->add(fontData->zeroWidthSpaceGly
ph(), fontData, m_expansionPerOpportunity); | 222 glyphBuffer->add(fontData->zeroWidthSpaceGly
ph(), fontData, m_expansionPerOpportunity); |
226 else | 223 else |
227 glyphBuffer->add(fontData->spaceGlyph(), fon
tData, expansionAtThisOpportunity); | 224 glyphBuffer->add(fontData->spaceGlyph(), fon
tData, expansionAtThisOpportunity); |
228 } else | 225 } else |
229 glyphBuffer->expandLastAdvance(expansionAtThisOp
portunity); | 226 glyphBuffer->expandLastAdvance(expansionAtThisOp
portunity); |
230 } | 227 } |
231 previousExpansion = m_expansion; | 228 previousExpansion = m_expansion; |
232 } | 229 } |
233 if (m_run.allowsTrailingExpansion() || (m_run.ltr() && textI
terator.currentCharacter() + advanceLength < static_cast<size_t>(m_run.length())
) | 230 if (m_run.allowsTrailingExpansion() || (m_run.ltr() && textI
terator.currentCharacter() + advanceLength < static_cast<size_t>(m_run.length())
) |
234 || (m_run.rtl() && textIterator.currentCharacter())) { | 231 || (m_run.rtl() && textIterator.currentCharacter())) { |
235 m_expansion -= m_expansionPerOpportunity; | 232 m_expansion -= m_expansionPerOpportunity; |
236 width += !m_run.applyWordRounding() ? m_expansionPerOppo
rtunity : roundf(previousExpansion) - roundf(m_expansion); | 233 width += !m_run.applyWordRounding() ? m_expansionPerOppo
rtunity : roundf(previousExpansion) - roundf(m_expansion); |
237 m_isAfterExpansion = true; | 234 m_isAfterExpansion = true; |
238 } | 235 } |
239 } else | 236 } else |
240 m_isAfterExpansion = false; | 237 m_isAfterExpansion = false; |
241 | 238 |
242 // Account for word spacing. | 239 // Account for word spacing. |
243 // We apply additional space between "words" by adding width to
the space character. | 240 // We apply additional space between "words" by adding width to
the space character. |
244 if (isExpansionOpportunity && (character != '\t' || !m_run.allow
Tabs()) && (textIterator.currentCharacter() || character == noBreakSpace) && m_f
ont->wordSpacing()) | 241 if (treatAsSpace && (character != '\t' || !m_run.allowTabs()) &&
(textIterator.currentCharacter() || character == noBreakSpace) && m_font->wordS
pacing()) |
245 width += m_font->wordSpacing(); | 242 width += m_font->wordSpacing(); |
246 } else | 243 } else |
247 m_isAfterExpansion = false; | 244 m_isAfterExpansion = false; |
248 } | 245 } |
249 | 246 |
250 if (shouldApplyFontTransforms() && glyphBuffer && Font::treatAsSpace(cha
racter)) | 247 if (shouldApplyFontTransforms() && glyphBuffer && Font::treatAsSpace(cha
racter)) |
251 charactersTreatedAsSpace.append(make_pair(glyphBuffer->size(), | 248 charactersTreatedAsSpace.append(make_pair(glyphBuffer->size(), |
252 OriginalAdvancesForCharacterTreatedAsSpace(character == ' ', gly
phBuffer->size() ? glyphBuffer->advanceAt(glyphBuffer->size() - 1) : 0, width)))
; | 249 OriginalAdvancesForCharacterTreatedAsSpace(character == ' ', gly
phBuffer->size() ? glyphBuffer->advanceAt(glyphBuffer->size() - 1) : 0, width)))
; |
253 | 250 |
254 if (m_accountForGlyphBounds) { | 251 if (m_accountForGlyphBounds) { |
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337 unsigned oldSize = glyphBuffer.size(); | 334 unsigned oldSize = glyphBuffer.size(); |
338 advance(m_currentCharacter + 1, &glyphBuffer); | 335 advance(m_currentCharacter + 1, &glyphBuffer); |
339 float w = 0; | 336 float w = 0; |
340 for (unsigned i = oldSize; i < glyphBuffer.size(); ++i) | 337 for (unsigned i = oldSize; i < glyphBuffer.size(); ++i) |
341 w += glyphBuffer.advanceAt(i); | 338 w += glyphBuffer.advanceAt(i); |
342 width = w; | 339 width = w; |
343 return glyphBuffer.size() > oldSize; | 340 return glyphBuffer.size() > oldSize; |
344 } | 341 } |
345 | 342 |
346 } | 343 } |
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