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| 1 /** | |
| 2 * Copyright (C) 2003, 2006, 2010 Apple Inc. All rights reserved. | |
| 3 * Copyright (C) 2008 Holger Hans Peter Freyther | |
| 4 * Copyright (C) 2009 Torch Mobile, Inc. | |
| 5 * | |
| 6 * This library is free software; you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU Library General Public | |
| 8 * License as published by the Free Software Foundation; either | |
| 9 * version 2 of the License, or (at your option) any later version. | |
| 10 * | |
| 11 * This library is distributed in the hope that it will be useful, | |
| 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 * Library General Public License for more details. | |
| 15 * | |
| 16 * You should have received a copy of the GNU Library General Public License | |
| 17 * along with this library; see the file COPYING.LIB. If not, write to | |
| 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 19 * Boston, MA 02110-1301, USA. | |
| 20 * | |
| 21 */ | |
| 22 | |
| 23 #include "config.h" | |
| 24 #include "core/platform/graphics/Font.h" | |
| 25 | |
| 26 #include "core/platform/graphics/FontCache.h" | |
| 27 #include "core/platform/graphics/FontFallbackList.h" | |
| 28 #include "core/platform/graphics/GlyphPageTreeNode.h" | |
| 29 #include "core/platform/graphics/SimpleFontData.h" | |
| 30 #include "core/platform/graphics/WidthIterator.h" | |
| 31 #include "platform/LayoutUnit.h" | |
| 32 #include "platform/fonts/GlyphBuffer.h" | |
| 33 #include "platform/geometry/FloatRect.h" | |
| 34 #include "platform/graphics/TextRun.h" | |
| 35 #include "wtf/MainThread.h" | |
| 36 #include "wtf/MathExtras.h" | |
| 37 #include "wtf/unicode/CharacterNames.h" | |
| 38 #include "wtf/unicode/Unicode.h" | |
| 39 | |
| 40 using namespace WTF; | |
| 41 using namespace Unicode; | |
| 42 using namespace std; | |
| 43 | |
| 44 namespace WebCore { | |
| 45 | |
| 46 static inline bool isInRange(UChar32 character, UChar32 lowerBound, UChar32 uppe
rBound) | |
| 47 { | |
| 48 return character >= lowerBound && character <= upperBound; | |
| 49 } | |
| 50 | |
| 51 static bool shouldIgnoreRotation(UChar32 character) | |
| 52 { | |
| 53 if (character == 0x000A7 || character == 0x000A9 || character == 0x000AE) | |
| 54 return true; | |
| 55 | |
| 56 if (character == 0x000B6 || character == 0x000BC || character == 0x000BD ||
character == 0x000BE) | |
| 57 return true; | |
| 58 | |
| 59 if (isInRange(character, 0x002E5, 0x002EB)) | |
| 60 return true; | |
| 61 | |
| 62 if (isInRange(character, 0x01100, 0x011FF) || isInRange(character, 0x01401,
0x0167F) || isInRange(character, 0x01800, 0x018FF)) | |
| 63 return true; | |
| 64 | |
| 65 if (character == 0x02016 || character == 0x02018 || character == 0x02019 ||
character == 0x02020 || character == 0x02021 | |
| 66 || character == 0x2030 || character == 0x02031) | |
| 67 return true; | |
| 68 | |
| 69 if (isInRange(character, 0x0203B, 0x0203D) || character == 0x02042 || charac
ter == 0x02044 || character == 0x02047 | |
| 70 || character == 0x02048 || character == 0x02049 || character == 0x2051) | |
| 71 return true; | |
| 72 | |
| 73 if (isInRange(character, 0x02065, 0x02069) || isInRange(character, 0x020DD,
0x020E0) | |
| 74 || isInRange(character, 0x020E2, 0x020E4) || isInRange(character, 0x0210
0, 0x02117) | |
| 75 || isInRange(character, 0x02119, 0x02131) || isInRange(character, 0x0213
3, 0x0213F)) | |
| 76 return true; | |
| 77 | |
| 78 if (isInRange(character, 0x02145, 0x0214A) || character == 0x0214C || charac
ter == 0x0214D | |
| 79 || isInRange(character, 0x0214F, 0x0218F)) | |
| 80 return true; | |
| 81 | |
| 82 if (isInRange(character, 0x02300, 0x02307) || isInRange(character, 0x0230C,
0x0231F) | |
| 83 || isInRange(character, 0x02322, 0x0232B) || isInRange(character, 0x0237
D, 0x0239A) | |
| 84 || isInRange(character, 0x023B4, 0x023B6) || isInRange(character, 0x023B
A, 0x023CF) | |
| 85 || isInRange(character, 0x023D1, 0x023DB) || isInRange(character, 0x023E
2, 0x024FF)) | |
| 86 return true; | |
| 87 | |
| 88 if (isInRange(character, 0x025A0, 0x02619) || isInRange(character, 0x02620,
0x02767) | |
| 89 || isInRange(character, 0x02776, 0x02793) || isInRange(character, 0x02B1
2, 0x02B2F) | |
| 90 || isInRange(character, 0x02B4D, 0x02BFF) || isInRange(character, 0x02E8
0, 0x03007)) | |
| 91 return true; | |
| 92 | |
| 93 if (character == 0x03012 || character == 0x03013 || isInRange(character, 0x0
3020, 0x0302F) | |
| 94 || isInRange(character, 0x03031, 0x0309F) || isInRange(character, 0x030A
1, 0x030FB) | |
| 95 || isInRange(character, 0x030FD, 0x0A4CF)) | |
| 96 return true; | |
| 97 | |
| 98 if (isInRange(character, 0x0A840, 0x0A87F) || isInRange(character, 0x0A960,
0x0A97F) | |
| 99 || isInRange(character, 0x0AC00, 0x0D7FF) || isInRange(character, 0x0E00
0, 0x0FAFF)) | |
| 100 return true; | |
| 101 | |
| 102 if (isInRange(character, 0x0FE10, 0x0FE1F) || isInRange(character, 0x0FE30,
0x0FE48) | |
| 103 || isInRange(character, 0x0FE50, 0x0FE57) || isInRange(character, 0x0FE5
F, 0x0FE62) | |
| 104 || isInRange(character, 0x0FE67, 0x0FE6F)) | |
| 105 return true; | |
| 106 | |
| 107 if (isInRange(character, 0x0FF01, 0x0FF07) || isInRange(character, 0x0FF0A,
0x0FF0C) | |
| 108 || isInRange(character, 0x0FF0E, 0x0FF19) ||isInRange (character, 0x0FF1
F, 0x0FF3A)) | |
| 109 return true; | |
| 110 | |
| 111 if (character == 0x0FF3C || character == 0x0FF3E) | |
| 112 return true; | |
| 113 | |
| 114 if (isInRange(character, 0x0FF40, 0x0FF5A) || isInRange(character, 0x0FFE0,
0x0FFE2) | |
| 115 || isInRange(character, 0x0FFE4, 0x0FFE7) || isInRange(character, 0x0FFF
0, 0x0FFF8) | |
| 116 || character == 0x0FFFD) | |
| 117 return true; | |
| 118 | |
| 119 if (isInRange(character, 0x13000, 0x1342F) || isInRange(character, 0x1B000,
0x1B0FF) | |
| 120 || isInRange(character, 0x1D000, 0x1D1FF) || isInRange(character, 0x1D30
0, 0x1D37F) | |
| 121 || isInRange(character, 0x1F000, 0x1F64F) || isInRange(character, 0x1F68
0, 0x1F77F)) | |
| 122 return true; | |
| 123 | |
| 124 if (isInRange(character, 0x20000, 0x2FFFD) || isInRange(character, 0x30000,
0x3FFFD)) | |
| 125 return true; | |
| 126 | |
| 127 return false; | |
| 128 } | |
| 129 | |
| 130 static inline std::pair<GlyphData, GlyphPage*> glyphDataAndPageForNonCJKCharacte
rWithGlyphOrientation(UChar32 character, NonCJKGlyphOrientation orientation, Gly
phData& data, GlyphPage* page, unsigned pageNumber) | |
| 131 { | |
| 132 if (orientation == NonCJKGlyphOrientationUpright || shouldIgnoreRotation(cha
racter)) { | |
| 133 RefPtr<SimpleFontData> uprightFontData = data.fontData->uprightOrientati
onFontData(); | |
| 134 GlyphPageTreeNode* uprightNode = GlyphPageTreeNode::getRootChild(upright
FontData.get(), pageNumber); | |
| 135 GlyphPage* uprightPage = uprightNode->page(); | |
| 136 if (uprightPage) { | |
| 137 GlyphData uprightData = uprightPage->glyphDataForCharacter(character
); | |
| 138 // If the glyphs are the same, then we know we can just use the hori
zontal glyph rotated vertically to be upright. | |
| 139 if (data.glyph == uprightData.glyph) | |
| 140 return make_pair(data, page); | |
| 141 // The glyphs are distinct, meaning that the font has a vertical-rig
ht glyph baked into it. We can't use that | |
| 142 // glyph, so we fall back to the upright data and use the horizontal
glyph. | |
| 143 if (uprightData.fontData) | |
| 144 return make_pair(uprightData, uprightPage); | |
| 145 } | |
| 146 } else if (orientation == NonCJKGlyphOrientationVerticalRight) { | |
| 147 RefPtr<SimpleFontData> verticalRightFontData = data.fontData->verticalRi
ghtOrientationFontData(); | |
| 148 GlyphPageTreeNode* verticalRightNode = GlyphPageTreeNode::getRootChild(v
erticalRightFontData.get(), pageNumber); | |
| 149 GlyphPage* verticalRightPage = verticalRightNode->page(); | |
| 150 if (verticalRightPage) { | |
| 151 GlyphData verticalRightData = verticalRightPage->glyphDataForCharact
er(character); | |
| 152 // If the glyphs are distinct, we will make the assumption that the
font has a vertical-right glyph baked | |
| 153 // into it. | |
| 154 if (data.glyph != verticalRightData.glyph) | |
| 155 return make_pair(data, page); | |
| 156 // The glyphs are identical, meaning that we should just use the hor
izontal glyph. | |
| 157 if (verticalRightData.fontData) | |
| 158 return make_pair(verticalRightData, verticalRightPage); | |
| 159 } | |
| 160 } | |
| 161 return make_pair(data, page); | |
| 162 } | |
| 163 | |
| 164 std::pair<GlyphData, GlyphPage*> Font::glyphDataAndPageForCharacter(UChar32 c, b
ool mirror, FontDataVariant variant) const | |
| 165 { | |
| 166 ASSERT(isMainThread()); | |
| 167 | |
| 168 if (variant == AutoVariant) { | |
| 169 if (m_fontDescription.smallCaps() && !primaryFont()->isSVGFont()) { | |
| 170 UChar32 upperC = toUpper(c); | |
| 171 if (upperC != c) { | |
| 172 c = upperC; | |
| 173 variant = SmallCapsVariant; | |
| 174 } else | |
| 175 variant = NormalVariant; | |
| 176 } else | |
| 177 variant = NormalVariant; | |
| 178 } | |
| 179 | |
| 180 if (mirror) | |
| 181 c = mirroredChar(c); | |
| 182 | |
| 183 unsigned pageNumber = (c / GlyphPage::size); | |
| 184 | |
| 185 GlyphPageTreeNode* node = pageNumber ? m_fontFallbackList->m_pages.get(pageN
umber) : m_fontFallbackList->m_pageZero; | |
| 186 if (!node) { | |
| 187 node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber); | |
| 188 if (pageNumber) | |
| 189 m_fontFallbackList->m_pages.set(pageNumber, node); | |
| 190 else | |
| 191 m_fontFallbackList->m_pageZero = node; | |
| 192 } | |
| 193 | |
| 194 GlyphPage* page = 0; | |
| 195 if (variant == NormalVariant) { | |
| 196 // Fastest loop, for the common case (normal variant). | |
| 197 while (true) { | |
| 198 page = node->page(); | |
| 199 if (page) { | |
| 200 GlyphData data = page->glyphDataForCharacter(c); | |
| 201 if (data.fontData && (data.fontData->platformData().orientation(
) == Horizontal || data.fontData->isTextOrientationFallback())) | |
| 202 return make_pair(data, page); | |
| 203 | |
| 204 if (data.fontData) { | |
| 205 if (isCJKIdeographOrSymbol(c)) { | |
| 206 if (!data.fontData->hasVerticalGlyphs()) { | |
| 207 // Use the broken ideograph font data. The broken id
eograph font will use the horizontal width of glyphs | |
| 208 // to make sure you get a square (even for broken gl
yphs like symbols used for punctuation). | |
| 209 variant = BrokenIdeographVariant; | |
| 210 break; | |
| 211 } | |
| 212 } else | |
| 213 return glyphDataAndPageForNonCJKCharacterWithGlyphOrient
ation(c, m_fontDescription.nonCJKGlyphOrientation(), data, page, pageNumber); | |
| 214 | |
| 215 return make_pair(data, page); | |
| 216 } | |
| 217 | |
| 218 if (node->isSystemFallback()) | |
| 219 break; | |
| 220 } | |
| 221 | |
| 222 // Proceed with the fallback list. | |
| 223 node = node->getChild(fontDataAt(node->level()), pageNumber); | |
| 224 if (pageNumber) | |
| 225 m_fontFallbackList->m_pages.set(pageNumber, node); | |
| 226 else | |
| 227 m_fontFallbackList->m_pageZero = node; | |
| 228 } | |
| 229 } | |
| 230 if (variant != NormalVariant) { | |
| 231 while (true) { | |
| 232 page = node->page(); | |
| 233 if (page) { | |
| 234 GlyphData data = page->glyphDataForCharacter(c); | |
| 235 if (data.fontData) { | |
| 236 // The variantFontData function should not normally return 0
. | |
| 237 // But if it does, we will just render the capital letter bi
g. | |
| 238 RefPtr<SimpleFontData> variantFontData = data.fontData->vari
antFontData(m_fontDescription, variant); | |
| 239 if (!variantFontData) | |
| 240 return make_pair(data, page); | |
| 241 | |
| 242 GlyphPageTreeNode* variantNode = GlyphPageTreeNode::getRootC
hild(variantFontData.get(), pageNumber); | |
| 243 GlyphPage* variantPage = variantNode->page(); | |
| 244 if (variantPage) { | |
| 245 GlyphData data = variantPage->glyphDataForCharacter(c); | |
| 246 if (data.fontData) | |
| 247 return make_pair(data, variantPage); | |
| 248 } | |
| 249 | |
| 250 // Do not attempt system fallback off the variantFontData. T
his is the very unlikely case that | |
| 251 // a font has the lowercase character but the small caps fon
t does not have its uppercase version. | |
| 252 return make_pair(variantFontData->missingGlyphData(), page); | |
| 253 } | |
| 254 | |
| 255 if (node->isSystemFallback()) | |
| 256 break; | |
| 257 } | |
| 258 | |
| 259 // Proceed with the fallback list. | |
| 260 node = node->getChild(fontDataAt(node->level()), pageNumber); | |
| 261 if (pageNumber) | |
| 262 m_fontFallbackList->m_pages.set(pageNumber, node); | |
| 263 else | |
| 264 m_fontFallbackList->m_pageZero = node; | |
| 265 } | |
| 266 } | |
| 267 | |
| 268 ASSERT(page); | |
| 269 ASSERT(node->isSystemFallback()); | |
| 270 | |
| 271 // System fallback is character-dependent. When we get here, we | |
| 272 // know that the character in question isn't in the system fallback | |
| 273 // font's glyph page. Try to lazily create it here. | |
| 274 | |
| 275 // FIXME: Unclear if this should normalizeSpaces above 0xFFFF. | |
| 276 // Doing so changes fast/text/international/plane2-diffs.html | |
| 277 UChar32 characterToRender = c; | |
| 278 if (characterToRender <= 0xFFFF) | |
| 279 characterToRender = Font::normalizeSpaces(characterToRender); | |
| 280 const SimpleFontData* fontDataToSubstitute = fontDataAt(0)->fontDataForChara
cter(characterToRender); | |
| 281 RefPtr<SimpleFontData> characterFontData = fontCache()->platformFallbackForC
haracter(m_fontDescription, characterToRender, fontDataToSubstitute, isPlatformF
ont()); | |
| 282 if (characterFontData) { | |
| 283 if (characterFontData->platformData().orientation() == Vertical && !char
acterFontData->hasVerticalGlyphs() && isCJKIdeographOrSymbol(c)) | |
| 284 variant = BrokenIdeographVariant; | |
| 285 if (variant != NormalVariant) | |
| 286 characterFontData = characterFontData->variantFontData(m_fontDescrip
tion, variant); | |
| 287 } | |
| 288 if (characterFontData) { | |
| 289 // Got the fallback glyph and font. | |
| 290 GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontD
ata.get(), pageNumber)->page(); | |
| 291 GlyphData data = fallbackPage && fallbackPage->fontDataForCharacter(c) ?
fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData(); | |
| 292 // Cache it so we don't have to do system fallback again next time. | |
| 293 if (variant == NormalVariant) { | |
| 294 page->setGlyphDataForCharacter(c, data.glyph, data.fontData); | |
| 295 data.fontData->setMaxGlyphPageTreeLevel(max(data.fontData->maxGlyphP
ageTreeLevel(), node->level())); | |
| 296 if (!isCJKIdeographOrSymbol(c) && data.fontData->platformData().orie
ntation() != Horizontal && !data.fontData->isTextOrientationFallback()) | |
| 297 return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(c,
m_fontDescription.nonCJKGlyphOrientation(), data, fallbackPage, pageNumber); | |
| 298 } | |
| 299 return make_pair(data, page); | |
| 300 } | |
| 301 | |
| 302 // Even system fallback can fail; use the missing glyph in that case. | |
| 303 // FIXME: It would be nicer to use the missing glyph from the last resort fo
nt instead. | |
| 304 GlyphData data = primaryFont()->missingGlyphData(); | |
| 305 if (variant == NormalVariant) { | |
| 306 page->setGlyphDataForCharacter(c, data.glyph, data.fontData); | |
| 307 data.fontData->setMaxGlyphPageTreeLevel(max(data.fontData->maxGlyphPageT
reeLevel(), node->level())); | |
| 308 } | |
| 309 return make_pair(data, page); | |
| 310 } | |
| 311 | |
| 312 bool Font::primaryFontHasGlyphForCharacter(UChar32 character) const | |
| 313 { | |
| 314 unsigned pageNumber = (character / GlyphPage::size); | |
| 315 | |
| 316 GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(primaryFont(), pag
eNumber); | |
| 317 GlyphPage* page = node->page(); | |
| 318 | |
| 319 return page && page->fontDataForCharacter(character); | |
| 320 } | |
| 321 | |
| 322 // FIXME: This function may not work if the emphasis mark uses a complex script,
but none of the | |
| 323 // standard emphasis marks do so. | |
| 324 bool Font::getEmphasisMarkGlyphData(const AtomicString& mark, GlyphData& glyphDa
ta) const | |
| 325 { | |
| 326 if (mark.isEmpty()) | |
| 327 return false; | |
| 328 | |
| 329 UChar32 character = mark[0]; | |
| 330 | |
| 331 if (U16_IS_SURROGATE(character)) { | |
| 332 if (!U16_IS_SURROGATE_LEAD(character)) | |
| 333 return false; | |
| 334 | |
| 335 if (mark.length() < 2) | |
| 336 return false; | |
| 337 | |
| 338 UChar low = mark[1]; | |
| 339 if (!U16_IS_TRAIL(low)) | |
| 340 return false; | |
| 341 | |
| 342 character = U16_GET_SUPPLEMENTARY(character, low); | |
| 343 } | |
| 344 | |
| 345 glyphData = glyphDataForCharacter(character, false, EmphasisMarkVariant); | |
| 346 return true; | |
| 347 } | |
| 348 | |
| 349 int Font::emphasisMarkAscent(const AtomicString& mark) const | |
| 350 { | |
| 351 FontCachePurgePreventer purgePreventer; | |
| 352 | |
| 353 GlyphData markGlyphData; | |
| 354 if (!getEmphasisMarkGlyphData(mark, markGlyphData)) | |
| 355 return 0; | |
| 356 | |
| 357 const SimpleFontData* markFontData = markGlyphData.fontData; | |
| 358 ASSERT(markFontData); | |
| 359 if (!markFontData) | |
| 360 return 0; | |
| 361 | |
| 362 return markFontData->fontMetrics().ascent(); | |
| 363 } | |
| 364 | |
| 365 int Font::emphasisMarkDescent(const AtomicString& mark) const | |
| 366 { | |
| 367 FontCachePurgePreventer purgePreventer; | |
| 368 | |
| 369 GlyphData markGlyphData; | |
| 370 if (!getEmphasisMarkGlyphData(mark, markGlyphData)) | |
| 371 return 0; | |
| 372 | |
| 373 const SimpleFontData* markFontData = markGlyphData.fontData; | |
| 374 ASSERT(markFontData); | |
| 375 if (!markFontData) | |
| 376 return 0; | |
| 377 | |
| 378 return markFontData->fontMetrics().descent(); | |
| 379 } | |
| 380 | |
| 381 int Font::emphasisMarkHeight(const AtomicString& mark) const | |
| 382 { | |
| 383 FontCachePurgePreventer purgePreventer; | |
| 384 | |
| 385 GlyphData markGlyphData; | |
| 386 if (!getEmphasisMarkGlyphData(mark, markGlyphData)) | |
| 387 return 0; | |
| 388 | |
| 389 const SimpleFontData* markFontData = markGlyphData.fontData; | |
| 390 ASSERT(markFontData); | |
| 391 if (!markFontData) | |
| 392 return 0; | |
| 393 | |
| 394 return markFontData->fontMetrics().height(); | |
| 395 } | |
| 396 | |
| 397 float Font::getGlyphsAndAdvancesForSimpleText(const TextRun& run, int from, int
to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const | |
| 398 { | |
| 399 float initialAdvance; | |
| 400 | |
| 401 WidthIterator it(this, run, 0, false, forTextEmphasis); | |
| 402 // FIXME: Using separate glyph buffers for the prefix and the suffix is inco
rrect when kerning or | |
| 403 // ligatures are enabled. | |
| 404 GlyphBuffer localGlyphBuffer; | |
| 405 it.advance(from, &localGlyphBuffer); | |
| 406 float beforeWidth = it.m_runWidthSoFar; | |
| 407 it.advance(to, &glyphBuffer); | |
| 408 | |
| 409 if (glyphBuffer.isEmpty()) | |
| 410 return 0; | |
| 411 | |
| 412 float afterWidth = it.m_runWidthSoFar; | |
| 413 | |
| 414 if (run.rtl()) { | |
| 415 float finalRoundingWidth = it.m_finalRoundingWidth; | |
| 416 it.advance(run.length(), &localGlyphBuffer); | |
| 417 initialAdvance = finalRoundingWidth + it.m_runWidthSoFar - afterWidth; | |
| 418 } else | |
| 419 initialAdvance = beforeWidth; | |
| 420 | |
| 421 if (run.rtl()) | |
| 422 glyphBuffer.reverse(0, glyphBuffer.size()); | |
| 423 | |
| 424 return initialAdvance; | |
| 425 } | |
| 426 | |
| 427 void Font::drawSimpleText(GraphicsContext* context, const TextRunPaintInfo& runI
nfo, const FloatPoint& point) const | |
| 428 { | |
| 429 // This glyph buffer holds our glyphs+advances+font data for each glyph. | |
| 430 GlyphBuffer glyphBuffer; | |
| 431 | |
| 432 float startX = point.x() + getGlyphsAndAdvancesForSimpleText(runInfo.run, ru
nInfo.from, runInfo.to, glyphBuffer); | |
| 433 | |
| 434 if (glyphBuffer.isEmpty()) | |
| 435 return; | |
| 436 | |
| 437 FloatPoint startPoint(startX, point.y()); | |
| 438 drawGlyphBuffer(context, runInfo, glyphBuffer, startPoint); | |
| 439 } | |
| 440 | |
| 441 void Font::drawEmphasisMarksForSimpleText(GraphicsContext* context, const TextRu
nPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const | |
| 442 { | |
| 443 GlyphBuffer glyphBuffer; | |
| 444 float initialAdvance = getGlyphsAndAdvancesForSimpleText(runInfo.run, runInf
o.from, runInfo.to, glyphBuffer, ForTextEmphasis); | |
| 445 | |
| 446 if (glyphBuffer.isEmpty()) | |
| 447 return; | |
| 448 | |
| 449 drawEmphasisMarks(context, runInfo, glyphBuffer, mark, FloatPoint(point.x()
+ initialAdvance, point.y())); | |
| 450 } | |
| 451 | |
| 452 void Font::drawGlyphBuffer(GraphicsContext* context, const TextRunPaintInfo& run
Info, const GlyphBuffer& glyphBuffer, const FloatPoint& point) const | |
| 453 { | |
| 454 // Draw each contiguous run of glyphs that use the same font data. | |
| 455 const SimpleFontData* fontData = glyphBuffer.fontDataAt(0); | |
| 456 FloatPoint startPoint(point); | |
| 457 float nextX = startPoint.x() + glyphBuffer.advanceAt(0); | |
| 458 unsigned lastFrom = 0; | |
| 459 unsigned nextGlyph = 1; | |
| 460 #if ENABLE(SVG_FONTS) | |
| 461 TextRun::RenderingContext* renderingContext = runInfo.run.renderingContext()
; | |
| 462 #endif | |
| 463 while (nextGlyph < glyphBuffer.size()) { | |
| 464 const SimpleFontData* nextFontData = glyphBuffer.fontDataAt(nextGlyph); | |
| 465 | |
| 466 if (nextFontData != fontData) { | |
| 467 #if ENABLE(SVG_FONTS) | |
| 468 if (renderingContext && fontData->isSVGFont()) | |
| 469 renderingContext->drawSVGGlyphs(context, runInfo.run, fontData,
glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint); | |
| 470 else | |
| 471 #endif | |
| 472 drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph -
lastFrom, startPoint, runInfo.bounds); | |
| 473 | |
| 474 lastFrom = nextGlyph; | |
| 475 fontData = nextFontData; | |
| 476 startPoint.setX(nextX); | |
| 477 } | |
| 478 nextX += glyphBuffer.advanceAt(nextGlyph); | |
| 479 nextGlyph++; | |
| 480 } | |
| 481 | |
| 482 #if ENABLE(SVG_FONTS) | |
| 483 if (renderingContext && fontData->isSVGFont()) | |
| 484 renderingContext->drawSVGGlyphs(context, runInfo.run, fontData, glyphBuf
fer, lastFrom, nextGlyph - lastFrom, startPoint); | |
| 485 else | |
| 486 #endif | |
| 487 drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFro
m, startPoint, runInfo.bounds); | |
| 488 } | |
| 489 | |
| 490 inline static float offsetToMiddleOfGlyph(const SimpleFontData* fontData, Glyph
glyph) | |
| 491 { | |
| 492 if (fontData->platformData().orientation() == Horizontal) { | |
| 493 FloatRect bounds = fontData->boundsForGlyph(glyph); | |
| 494 return bounds.x() + bounds.width() / 2; | |
| 495 } | |
| 496 // FIXME: Use glyph bounds once they make sense for vertical fonts. | |
| 497 return fontData->widthForGlyph(glyph) / 2; | |
| 498 } | |
| 499 | |
| 500 inline static float offsetToMiddleOfGlyphAtIndex(const GlyphBuffer& glyphBuffer,
size_t i) | |
| 501 { | |
| 502 return offsetToMiddleOfGlyph(glyphBuffer.fontDataAt(i), glyphBuffer.glyphAt(
i)); | |
| 503 } | |
| 504 | |
| 505 void Font::drawEmphasisMarks(GraphicsContext* context, const TextRunPaintInfo& r
unInfo, const GlyphBuffer& glyphBuffer, const AtomicString& mark, const FloatPoi
nt& point) const | |
| 506 { | |
| 507 FontCachePurgePreventer purgePreventer; | |
| 508 | |
| 509 GlyphData markGlyphData; | |
| 510 if (!getEmphasisMarkGlyphData(mark, markGlyphData)) | |
| 511 return; | |
| 512 | |
| 513 const SimpleFontData* markFontData = markGlyphData.fontData; | |
| 514 ASSERT(markFontData); | |
| 515 if (!markFontData) | |
| 516 return; | |
| 517 | |
| 518 Glyph markGlyph = markGlyphData.glyph; | |
| 519 Glyph spaceGlyph = markFontData->spaceGlyph(); | |
| 520 | |
| 521 float middleOfLastGlyph = offsetToMiddleOfGlyphAtIndex(glyphBuffer, 0); | |
| 522 FloatPoint startPoint(point.x() + middleOfLastGlyph - offsetToMiddleOfGlyph(
markFontData, markGlyph), point.y()); | |
| 523 | |
| 524 GlyphBuffer markBuffer; | |
| 525 for (unsigned i = 0; i + 1 < glyphBuffer.size(); ++i) { | |
| 526 float middleOfNextGlyph = offsetToMiddleOfGlyphAtIndex(glyphBuffer, i +
1); | |
| 527 float advance = glyphBuffer.advanceAt(i) - middleOfLastGlyph + middleOfN
extGlyph; | |
| 528 markBuffer.add(glyphBuffer.glyphAt(i) ? markGlyph : spaceGlyph, markFont
Data, advance); | |
| 529 middleOfLastGlyph = middleOfNextGlyph; | |
| 530 } | |
| 531 markBuffer.add(glyphBuffer.glyphAt(glyphBuffer.size() - 1) ? markGlyph : spa
ceGlyph, markFontData, 0); | |
| 532 | |
| 533 drawGlyphBuffer(context, runInfo, markBuffer, startPoint); | |
| 534 } | |
| 535 | |
| 536 float Font::floatWidthForSimpleText(const TextRun& run, HashSet<const SimpleFont
Data*>* fallbackFonts, GlyphOverflow* glyphOverflow) const | |
| 537 { | |
| 538 WidthIterator it(this, run, fallbackFonts, glyphOverflow); | |
| 539 GlyphBuffer glyphBuffer; | |
| 540 it.advance(run.length(), (typesettingFeatures() & (Kerning | Ligatures)) ? &
glyphBuffer : 0); | |
| 541 | |
| 542 if (glyphOverflow) { | |
| 543 glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-it.minGlyphBoun
dingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent())); | |
| 544 glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(it.maxGlyp
hBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent()))
; | |
| 545 glyphOverflow->left = ceilf(it.firstGlyphOverflow()); | |
| 546 glyphOverflow->right = ceilf(it.lastGlyphOverflow()); | |
| 547 } | |
| 548 | |
| 549 return it.m_runWidthSoFar; | |
| 550 } | |
| 551 | |
| 552 FloatRect Font::selectionRectForSimpleText(const TextRun& run, const FloatPoint&
point, int h, int from, int to) const | |
| 553 { | |
| 554 GlyphBuffer glyphBuffer; | |
| 555 WidthIterator it(this, run); | |
| 556 it.advance(from, &glyphBuffer); | |
| 557 float beforeWidth = it.m_runWidthSoFar; | |
| 558 it.advance(to, &glyphBuffer); | |
| 559 float afterWidth = it.m_runWidthSoFar; | |
| 560 | |
| 561 // Using roundf() rather than ceilf() for the right edge as a compromise to | |
| 562 // ensure correct caret positioning. | |
| 563 // Use LayoutUnit::epsilon() to ensure that values that cannot be stored as | |
| 564 // an integer are floored to n and not n-1 due to floating point imprecision
. | |
| 565 if (run.rtl()) { | |
| 566 it.advance(run.length(), &glyphBuffer); | |
| 567 float totalWidth = it.m_runWidthSoFar; | |
| 568 float pixelAlignedX = floorf(point.x() + totalWidth - afterWidth + Layou
tUnit::epsilon()); | |
| 569 return FloatRect(pixelAlignedX, point.y(), | |
| 570 roundf(point.x() + totalWidth - beforeWidth) - pixelAlignedX, h); | |
| 571 } | |
| 572 | |
| 573 float pixelAlignedX = floorf(point.x() + beforeWidth + LayoutUnit::epsilon()
); | |
| 574 return FloatRect(pixelAlignedX, point.y(), | |
| 575 roundf(point.x() + afterWidth) - pixelAlignedX, h); | |
| 576 } | |
| 577 | |
| 578 int Font::offsetForPositionForSimpleText(const TextRun& run, float x, bool inclu
dePartialGlyphs) const | |
| 579 { | |
| 580 float delta = x; | |
| 581 | |
| 582 WidthIterator it(this, run); | |
| 583 GlyphBuffer localGlyphBuffer; | |
| 584 unsigned offset; | |
| 585 if (run.rtl()) { | |
| 586 delta -= floatWidthForSimpleText(run); | |
| 587 while (1) { | |
| 588 offset = it.m_currentCharacter; | |
| 589 float w; | |
| 590 if (!it.advanceOneCharacter(w, localGlyphBuffer)) | |
| 591 break; | |
| 592 delta += w; | |
| 593 if (includePartialGlyphs) { | |
| 594 if (delta - w / 2 >= 0) | |
| 595 break; | |
| 596 } else { | |
| 597 if (delta >= 0) | |
| 598 break; | |
| 599 } | |
| 600 } | |
| 601 } else { | |
| 602 while (1) { | |
| 603 offset = it.m_currentCharacter; | |
| 604 float w; | |
| 605 if (!it.advanceOneCharacter(w, localGlyphBuffer)) | |
| 606 break; | |
| 607 delta -= w; | |
| 608 if (includePartialGlyphs) { | |
| 609 if (delta + w / 2 <= 0) | |
| 610 break; | |
| 611 } else { | |
| 612 if (delta <= 0) | |
| 613 break; | |
| 614 } | |
| 615 } | |
| 616 } | |
| 617 | |
| 618 return offset; | |
| 619 } | |
| 620 | |
| 621 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk