1 /* 2 * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #include "config.h" 21 22 #include "core/rendering/svg/SVGTextLayoutEngine.h" 23 24 #include "core/rendering/svg/RenderSVGInlineText.h" 25 #include "core/rendering/svg/RenderSVGTextPath.h" 26 #include "core/rendering/svg/SVGInlineTextBox.h" 27 #include "core/rendering/svg/SVGTextLayoutEngineBaseline.h" 28 #include "core/rendering/svg/SVGTextLayoutEngineSpacing.h" 29 #include "core/svg/SVGElement.h" 30 #include "core/svg/SVGLengthContext.h" 31 32 // Set to a value > 0 to dump the text fragments 33 #define DUMP_TEXT_FRAGMENTS 0 34 35 namespace WebCore { 36 37 SVGTextLayoutEngine::SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes*>& layoutAttributes) 38 : m_layoutAttributes(layoutAttributes) 39 , m_layoutAttributesPosition(0) 40 , m_logicalCharacterOffset(0) 41 , m_logicalMetricsListOffset(0) 42 , m_visualCharacterOffset(0) 43 , m_visualMetricsListOffset(0) 44 , m_x(0) 45 , m_y(0) 46 , m_dx(0) 47 , m_dy(0) 48 , m_isVerticalText(false) 49 , m_inPathLayout(false) 50 , m_textPathCalculator(0) 51 , m_textPathLength(0) 52 , m_textPathCurrentOffset(0) 53 , m_textPathSpacing(0) 54 , m_textPathScaling(1) 55 { 56 ASSERT(!m_layoutAttributes.isEmpty()); 57 } 58 59 void SVGTextLayoutEngine::updateCharacerPositionIfNeeded(float& x, float& y) 60 { 61 if (m_inPathLayout) 62 return; 63 64 // Replace characters x/y position, with the current text position plus any 65 // relative adjustments, if it doesn't specify an absolute position itself. 66 if (x == SVGTextLayoutAttributes::emptyValue()) 67 x = m_x + m_dx; 68 69 if (y == SVGTextLayoutAttributes::emptyValue()) 70 y = m_y + m_dy; 71 72 m_dx = 0; 73 m_dy = 0; 74 } 75 76 void SVGTextLayoutEngine::updateCurrentTextPosition(float x, float y, float glyphAdvance) 77 { 78 // Update current text position after processing the character. 79 if (m_isVerticalText) { 80 m_x = x; 81 m_y = y + glyphAdvance; 82 } else { 83 m_x = x + glyphAdvance; 84 m_y = y; 85 } 86 } 87 88 void SVGTextLayoutEngine::updateRelativePositionAdjustmentsIfNeeded(float dx, float dy) 89 { 90 // Update relative positioning information. 91 if (dx == SVGTextLayoutAttributes::emptyValue() && dy == SVGTextLayoutAttributes::emptyValue()) 92 return; 93 94 if (dx == SVGTextLayoutAttributes::emptyValue()) 95 dx = 0; 96 if (dy == SVGTextLayoutAttributes::emptyValue()) 97 dy = 0; 98 99 if (m_inPathLayout) { 100 if (m_isVerticalText) { 101 m_dx += dx; 102 m_dy = dy; 103 } else { 104 m_dx = dx; 105 m_dy += dy; 106 } 107 108 return; 109 } 110 111 m_dx = dx; 112 m_dy = dy; 113 } 114 115 void SVGTextLayoutEngine::recordTextFragment(SVGInlineTextBox* textBox, Vector<SVGTextMetrics>& textMetricsValues) 116 { 117 ASSERT(!m_currentTextFragment.length); 118 ASSERT(m_visualMetricsListOffset > 0); 119 120 // Figure out length of fragment. 121 m_currentTextFragment.length = m_visualCharacterOffset - m_currentTextFragment.characterOffset; 122 123 // Figure out fragment metrics. 124 SVGTextMetrics& lastCharacterMetrics = textMetricsValues.at(m_visualMetricsListOffset - 1); 125 m_currentTextFragment.width = lastCharacterMetrics.width(); 126 m_currentTextFragment.height = lastCharacterMetrics.height(); 127 128 if (m_currentTextFragment.length > 1) { 129 // SVGTextLayoutAttributesBuilder assures that the length of the range is equal to the sum of the individual lengths of the glyphs. 130 float length = 0; 131 if (m_isVerticalText) { 132 for (unsigned i = m_currentTextFragment.metricsListOffset; i < m_visualMetricsListOffset; ++i) 133 length += textMetricsValues.at(i).height(); 134 m_currentTextFragment.height = length; 135 } else { 136 for (unsigned i = m_currentTextFragment.metricsListOffset; i < m_visualMetricsListOffset; ++i) 137 length += textMetricsValues.at(i).width(); 138 m_currentTextFragment.width = length; 139 } 140 } 141 142 textBox->textFragments().append(m_currentTextFragment); 143 m_currentTextFragment = SVGTextFragment(); 144 } 145 146 bool SVGTextLayoutEngine::parentDefinesTextLength(RenderObject* parent) const 147 { 148 RenderObject* currentParent = parent; 149 while (currentParent) { 150 if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromRenderer(currentParent)) { 151 SVGLengthContext lengthContext(textContentElement); 152 if (textContentElement->lengthAdjust()->currentValue()->enumValue() == SVGLengthAdjustSpacing && textContentElement->textLengthIsSpecifiedByUser()) 153 return true; 154 } 155 156 if (currentParent->isSVGText()) 157 return false; 158 159 currentParent = currentParent->parent(); 160 } 161 162 ASSERT_NOT_REACHED(); 163 return false; 164 } 165 166 void SVGTextLayoutEngine::beginTextPathLayout(RenderObject* object, SVGTextLayoutEngine& lineLayout) 167 { 168 ASSERT(object); 169 170 m_inPathLayout = true; 171 RenderSVGTextPath* textPath = toRenderSVGTextPath(object); 172 173 Path path = textPath->layoutPath(); 174 if (path.isEmpty()) 175 return; 176 m_textPathCalculator = new Path::PositionCalculator(path); 177 m_textPathStartOffset = textPath->startOffset(); 178 m_textPathLength = path.length(); 179 if (m_textPathStartOffset > 0 && m_textPathStartOffset <= 1) 180 m_textPathStartOffset *= m_textPathLength; 181 182 float totalLength = 0; 183 unsigned totalCharacters = 0; 184 185 lineLayout.m_chunkLayoutBuilder.buildTextChunks(lineLayout.m_lineLayoutBoxes); 186 const Vector<SVGTextChunk>& textChunks = lineLayout.m_chunkLayoutBuilder.textChunks(); 187 188 unsigned size = textChunks.size(); 189 for (unsigned i = 0; i < size; ++i) { 190 const SVGTextChunk& chunk = textChunks.at(i); 191 192 float length = 0; 193 unsigned characters = 0; 194 chunk.calculateLength(length, characters); 195 196 // Handle text-anchor as additional start offset for text paths. 197 m_textPathStartOffset += chunk.calculateTextAnchorShift(length); 198 199 totalLength += length; 200 totalCharacters += characters; 201 } 202 203 m_textPathCurrentOffset = m_textPathStartOffset; 204 205 // Eventually handle textLength adjustments. 206 SVGLengthAdjustType lengthAdjust = SVGLengthAdjustUnknown; 207 float desiredTextLength = 0; 208 209 if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromRenderer(textPath)) { 210 SVGLengthContext lengthContext(textContentElement); 211 lengthAdjust = textContentElement->lengthAdjust()->currentValue()->enumValue(); 212 if (textContentElement->textLengthIsSpecifiedByUser()) 213 desiredTextLength = textContentElement->textLength()->currentValue()->value(lengthContext); 214 else 215 desiredTextLength = 0; 216 } 217 218 if (!desiredTextLength) 219 return; 220 221 if (lengthAdjust == SVGLengthAdjustSpacing) 222 m_textPathSpacing = (desiredTextLength - totalLength) / totalCharacters; 223 else 224 m_textPathScaling = desiredTextLength / totalLength; 225 } 226 227 void SVGTextLayoutEngine::endTextPathLayout() 228 { 229 m_inPathLayout = false; 230 delete m_textPathCalculator; 231 m_textPathCalculator = 0; 232 m_textPathLength = 0; 233 m_textPathStartOffset = 0; 234 m_textPathCurrentOffset = 0; 235 m_textPathSpacing = 0; 236 m_textPathScaling = 1; 237 } 238 239 void SVGTextLayoutEngine::layoutInlineTextBox(SVGInlineTextBox* textBox) 240 { 241 ASSERT(textBox); 242 243 RenderSVGInlineText& text = toRenderSVGInlineText(textBox->textRenderer()); 244 ASSERT(text.parent()); 245 ASSERT(text.parent()->node()); 246 ASSERT(text.parent()->node()->isSVGElement()); 247 248 const RenderStyle* style = text.style(); 249 ASSERT(style); 250 251 textBox->clearTextFragments(); 252 m_isVerticalText = style->svgStyle()->isVerticalWritingMode(); 253 layoutTextOnLineOrPath(textBox, &text, style); 254 255 if (m_inPathLayout) { 256 m_pathLayoutBoxes.append(textBox); 257 return; 258 } 259 260 m_lineLayoutBoxes.append(textBox); 261 } 262 263 #if DUMP_TEXT_FRAGMENTS > 0 264 static inline void dumpTextBoxes(Vector<SVGInlineTextBox*>& boxes) 265 { 266 unsigned boxCount = boxes.size(); 267 fprintf(stderr, "Dumping all text fragments in text sub tree, %i boxes\n", boxCount); 268 269 for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) { 270 SVGInlineTextBox* textBox = boxes.at(boxPosition); 271 Vector<SVGTextFragment>& fragments = textBox->textFragments(); 272 fprintf(stderr, "-> Box %i: Dumping text fragments for SVGInlineTextBox, textBox=%p, textRenderer=%p\n", boxPosition, textBox, textBox->textRenderer()); 273 fprintf(stderr, " textBox properties, start=%i, len=%i, box direction=%i\n", textBox->start(), textBox->len(), textBox->direction()); 274 fprintf(stderr, " textRenderer properties, textLength=%i\n", textBox->textRenderer()->textLength()); 275 276 String characters = textBox->textRenderer()->text(); 277 278 unsigned fragmentCount = fragments.size(); 279 for (unsigned i = 0; i < fragmentCount; ++i) { 280 SVGTextFragment& fragment = fragments.at(i); 281 String fragmentString = characters.substring(fragment.characterOffset, fragment.length); 282 fprintf(stderr, " -> Fragment %i, x=%lf, y=%lf, width=%lf, height=%lf, characterOffset=%i, length=%i, characters='%s'\n" 283 , i, fragment.x, fragment.y, fragment.width, fragment.height, fragment.characterOffset, fragment.length, fragmentString.utf8().data()); 284 } 285 } 286 } 287 #endif 288 289 void SVGTextLayoutEngine::finalizeTransformMatrices(Vector<SVGInlineTextBox*>& boxes) 290 { 291 unsigned boxCount = boxes.size(); 292 if (!boxCount) 293 return; 294 295 AffineTransform textBoxTransformation; 296 for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) { 297 SVGInlineTextBox* textBox = boxes.at(boxPosition); 298 Vector<SVGTextFragment>& fragments = textBox->textFragments(); 299 300 unsigned fragmentCount = fragments.size(); 301 for (unsigned i = 0; i < fragmentCount; ++i) { 302 m_chunkLayoutBuilder.transformationForTextBox(textBox, textBoxTransformation); 303 if (textBoxTransformation.isIdentity()) 304 continue; 305 ASSERT(fragments[i].lengthAdjustTransform.isIdentity()); 306 fragments[i].lengthAdjustTransform = textBoxTransformation; 307 } 308 } 309 310 boxes.clear(); 311 } 312 313 void SVGTextLayoutEngine::finishLayout() 314 { 315 // After all text fragments are stored in their correpsonding SVGInlineTextBoxes, we can layout individual text chunks. 316 // Chunk layouting is only performed for line layout boxes, not for path layout, where it has already been done. 317 m_chunkLayoutBuilder.layoutTextChunks(m_lineLayoutBoxes); 318 319 // Finalize transform matrices, after the chunk layout corrections have been applied, and all fragment x/y positions are finalized. 320 if (!m_lineLayoutBoxes.isEmpty()) { 321 #if DUMP_TEXT_FRAGMENTS > 0 322 fprintf(stderr, "Line layout: "); 323 dumpTextBoxes(m_lineLayoutBoxes); 324 #endif 325 326 finalizeTransformMatrices(m_lineLayoutBoxes); 327 } 328 329 if (!m_pathLayoutBoxes.isEmpty()) { 330 #if DUMP_TEXT_FRAGMENTS > 0 331 fprintf(stderr, "Path layout: "); 332 dumpTextBoxes(m_pathLayoutBoxes); 333 #endif 334 335 finalizeTransformMatrices(m_pathLayoutBoxes); 336 } 337 } 338 339 bool SVGTextLayoutEngine::currentLogicalCharacterAttributes(SVGTextLayoutAttributes*& logicalAttributes) 340 { 341 if (m_layoutAttributesPosition == m_layoutAttributes.size()) 342 return false; 343 344 logicalAttributes = m_layoutAttributes[m_layoutAttributesPosition]; 345 ASSERT(logicalAttributes); 346 347 if (m_logicalCharacterOffset != logicalAttributes->context()->textLength()) 348 return true; 349 350 ++m_layoutAttributesPosition; 351 if (m_layoutAttributesPosition == m_layoutAttributes.size()) 352 return false; 353 354 logicalAttributes = m_layoutAttributes[m_layoutAttributesPosition]; 355 m_logicalMetricsListOffset = 0; 356 m_logicalCharacterOffset = 0; 357 return true; 358 } 359 360 bool SVGTextLayoutEngine::currentLogicalCharacterMetrics(SVGTextLayoutAttributes*& logicalAttributes, SVGTextMetrics& logicalMetrics) 361 { 362 Vector<SVGTextMetrics>* textMetricsValues = &logicalAttributes->textMetricsValues(); 363 unsigned textMetricsSize = textMetricsValues->size(); 364 while (true) { 365 if (m_logicalMetricsListOffset == textMetricsSize) { 366 if (!currentLogicalCharacterAttributes(logicalAttributes)) 367 return false; 368 369 textMetricsValues = &logicalAttributes->textMetricsValues(); 370 textMetricsSize = textMetricsValues->size(); 371 continue; 372 } 373 374 ASSERT(textMetricsSize); 375 ASSERT(m_logicalMetricsListOffset < textMetricsSize); 376 logicalMetrics = textMetricsValues->at(m_logicalMetricsListOffset); 377 if (logicalMetrics.isEmpty() || (!logicalMetrics.width() && !logicalMetrics.height())) { 378 advanceToNextLogicalCharacter(logicalMetrics); 379 continue; 380 } 381 382 // Stop if we found the next valid logical text metrics object. 383 return true; 384 } 385 386 ASSERT_NOT_REACHED(); 387 return true; 388 } 389 390 bool SVGTextLayoutEngine::currentVisualCharacterMetrics(SVGInlineTextBox* textBox, Vector<SVGTextMetrics>& visualMetricsValues, SVGTextMetrics& visualMetrics) 391 { 392 ASSERT(!visualMetricsValues.isEmpty()); 393 unsigned textMetricsSize = visualMetricsValues.size(); 394 unsigned boxStart = textBox->start(); 395 unsigned boxLength = textBox->len(); 396 397 while (m_visualMetricsListOffset < textMetricsSize) { 398 // Advance to text box start location. 399 if (m_visualCharacterOffset < boxStart) { 400 advanceToNextVisualCharacter(visualMetricsValues[m_visualMetricsListOffset]); 401 continue; 402 } 403 404 // Stop if we've finished processing this text box. 405 if (m_visualCharacterOffset >= boxStart + boxLength) 406 return false; 407 408 visualMetrics = visualMetricsValues[m_visualMetricsListOffset]; 409 return true; 410 } 411 412 return false; 413 } 414 415 void SVGTextLayoutEngine::advanceToNextLogicalCharacter(const SVGTextMetrics& logicalMetrics) 416 { 417 ++m_logicalMetricsListOffset; 418 m_logicalCharacterOffset += logicalMetrics.length(); 419 } 420 421 void SVGTextLayoutEngine::advanceToNextVisualCharacter(const SVGTextMetrics& visualMetrics) 422 { 423 ++m_visualMetricsListOffset; 424 m_visualCharacterOffset += visualMetrics.length(); 425 } 426 427 void SVGTextLayoutEngine::layoutTextOnLineOrPath(SVGInlineTextBox* textBox, RenderSVGInlineText* text, const RenderStyle* style) 428 { 429 if (m_inPathLayout && !m_textPathCalculator) 430 return; 431 432 SVGElement* lengthContext = toSVGElement(text->parent()->node()); 433 434 RenderObject* textParent = text->parent(); 435 bool definesTextLength = textParent ? parentDefinesTextLength(textParent) : false; 436 437 const SVGRenderStyle* svgStyle = style->svgStyle(); 438 ASSERT(svgStyle); 439 440 m_visualMetricsListOffset = 0; 441 m_visualCharacterOffset = 0; 442 443 Vector<SVGTextMetrics>& visualMetricsValues = text->layoutAttributes()->textMetricsValues(); 444 ASSERT(!visualMetricsValues.isEmpty()); 445 446 const Font& font = style->font(); 447 448 SVGTextLayoutEngineSpacing spacingLayout(font, style->effectiveZoom()); 449 SVGTextLayoutEngineBaseline baselineLayout(font); 450 451 bool didStartTextFragment = false; 452 bool applySpacingToNextCharacter = false; 453 454 float lastAngle = 0; 455 float baselineShift = baselineLayout.calculateBaselineShift(svgStyle, lengthContext); 456 baselineShift -= baselineLayout.calculateAlignmentBaselineShift(m_isVerticalText, text); 457 458 // Main layout algorithm. 459 while (true) { 460 // Find the start of the current text box in this list, respecting ligatures. 461 SVGTextMetrics visualMetrics(SVGTextMetrics::SkippedSpaceMetrics); 462 if (!currentVisualCharacterMetrics(textBox, visualMetricsValues, visualMetrics)) 463 break; 464 465 if (visualMetrics.isEmpty()) { 466 advanceToNextVisualCharacter(visualMetrics); 467 continue; 468 } 469 470 SVGTextLayoutAttributes* logicalAttributes = 0; 471 if (!currentLogicalCharacterAttributes(logicalAttributes)) 472 break; 473 474 ASSERT(logicalAttributes); 475 SVGTextMetrics logicalMetrics(SVGTextMetrics::SkippedSpaceMetrics); 476 if (!currentLogicalCharacterMetrics(logicalAttributes, logicalMetrics)) 477 break; 478 479 SVGCharacterDataMap& characterDataMap = logicalAttributes->characterDataMap(); 480 SVGCharacterData data; 481 SVGCharacterDataMap::iterator it = characterDataMap.find(m_logicalCharacterOffset + 1); 482 if (it != characterDataMap.end()) 483 data = it->value; 484 485 float x = data.x; 486 float y = data.y; 487 488 // When we've advanced to the box start offset, determine using the original x/y values, 489 // whether this character starts a new text chunk, before doing any further processing. 490 if (m_visualCharacterOffset == textBox->start()) 491 textBox->setStartsNewTextChunk(logicalAttributes->context()->characterStartsNewTextChunk(m_logicalCharacterOffset)); 492 493 float angle = data.rotate == SVGTextLayoutAttributes::emptyValue() ? 0 : data.rotate; 494 495 // Calculate glyph orientation angle. 496 UChar currentCharacter = text->characterAt(m_visualCharacterOffset); 497 float orientationAngle = baselineLayout.calculateGlyphOrientationAngle(m_isVerticalText, svgStyle, currentCharacter); 498 499 // Calculate glyph advance & x/y orientation shifts. 500 float xOrientationShift = 0; 501 float yOrientationShift = 0; 502 float glyphAdvance = baselineLayout.calculateGlyphAdvanceAndOrientation(m_isVerticalText, visualMetrics, orientationAngle, xOrientationShift, yOrientationShift); 503 504 // Assign current text position to x/y values, if needed. 505 updateCharacerPositionIfNeeded(x, y); 506 507 // Apply dx/dy value adjustments to current text position, if needed. 508 updateRelativePositionAdjustmentsIfNeeded(data.dx, data.dy); 509 510 // Calculate SVG Fonts kerning, if needed. 511 float kerning = spacingLayout.calculateSVGKerning(m_isVerticalText, visualMetrics.glyph()); 512 513 // Calculate CSS 'letter-spacing' and 'word-spacing' for next character, if needed. 514 float spacing = spacingLayout.calculateCSSSpacing(currentCharacter); 515 516 float textPathOffset = 0; 517 if (m_inPathLayout) { 518 float scaledGlyphAdvance = glyphAdvance * m_textPathScaling; 519 if (m_isVerticalText) { 520 // If there's an absolute y position available, it marks the beginning of a new position along the path. 521 if (y != SVGTextLayoutAttributes::emptyValue()) 522 m_textPathCurrentOffset = y + m_textPathStartOffset; 523 524 m_textPathCurrentOffset += m_dy - kerning; 525 m_dy = 0; 526 527 // Apply dx/dy correction and setup translations that move to the glyph midpoint. 528 xOrientationShift += m_dx + baselineShift; 529 yOrientationShift -= scaledGlyphAdvance / 2; 530 } else { 531 // If there's an absolute x position available, it marks the beginning of a new position along the path. 532 if (x != SVGTextLayoutAttributes::emptyValue()) 533 m_textPathCurrentOffset = x + m_textPathStartOffset; 534 535 m_textPathCurrentOffset += m_dx - kerning; 536 m_dx = 0; 537 538 // Apply dx/dy correction and setup translations that move to the glyph midpoint. 539 xOrientationShift -= scaledGlyphAdvance / 2; 540 yOrientationShift += m_dy - baselineShift; 541 } 542 543 // Calculate current offset along path. 544 textPathOffset = m_textPathCurrentOffset + scaledGlyphAdvance / 2; 545 546 // Move to next character. 547 m_textPathCurrentOffset += scaledGlyphAdvance + m_textPathSpacing + spacing * m_textPathScaling; 548 549 // Skip character, if we're before the path. 550 if (textPathOffset < 0) { 551 advanceToNextLogicalCharacter(logicalMetrics); 552 advanceToNextVisualCharacter(visualMetrics); 553 continue; 554 } 555 556 // Stop processing, if the next character lies behind the path. 557 if (textPathOffset > m_textPathLength) 558 break; 559 560 FloatPoint point; 561 bool ok = m_textPathCalculator->pointAndNormalAtLength(textPathOffset, point, angle); 562 ASSERT_UNUSED(ok, ok); 563 x = point.x(); 564 y = point.y(); 565 566 // For vertical text on path, the actual angle has to be rotated 90 degrees anti-clockwise, not the orientation angle! 567 if (m_isVerticalText) 568 angle -= 90; 569 } else { 570 // Apply all previously calculated shift values. 571 if (m_isVerticalText) { 572 x += baselineShift; 573 y -= kerning; 574 } else { 575 x -= kerning; 576 y -= baselineShift; 577 } 578 579 x += m_dx; 580 y += m_dy; 581 } 582 583 // Determine whether we have to start a new fragment. 584 bool shouldStartNewFragment = m_dx || m_dy || m_isVerticalText || m_inPathLayout || angle || angle != lastAngle 585 || orientationAngle || kerning || applySpacingToNextCharacter || definesTextLength; 586 587 // If we already started a fragment, close it now. 588 if (didStartTextFragment && shouldStartNewFragment) { 589 applySpacingToNextCharacter = false; 590 recordTextFragment(textBox, visualMetricsValues); 591 } 592 593 // Eventually start a new fragment, if not yet done. 594 if (!didStartTextFragment || shouldStartNewFragment) { 595 ASSERT(!m_currentTextFragment.characterOffset); 596 ASSERT(!m_currentTextFragment.length); 597 598 didStartTextFragment = true; 599 m_currentTextFragment.characterOffset = m_visualCharacterOffset; 600 m_currentTextFragment.metricsListOffset = m_visualMetricsListOffset; 601 m_currentTextFragment.x = x; 602 m_currentTextFragment.y = y; 603 604 // Build fragment transformation. 605 if (angle) 606 m_currentTextFragment.transform.rotate(angle); 607 608 if (xOrientationShift || yOrientationShift) 609 m_currentTextFragment.transform.translate(xOrientationShift, yOrientationShift); 610 611 if (orientationAngle) 612 m_currentTextFragment.transform.rotate(orientationAngle); 613 614 m_currentTextFragment.isTextOnPath = m_inPathLayout && m_textPathScaling != 1; 615 if (m_currentTextFragment.isTextOnPath) { 616 if (m_isVerticalText) 617 m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(1, m_textPathScaling); 618 else 619 m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(m_textPathScaling, 1); 620 } 621 } 622 623 // Update current text position, after processing of the current character finished. 624 if (m_inPathLayout) 625 updateCurrentTextPosition(x, y, glyphAdvance); 626 else { 627 // Apply CSS 'kerning', 'letter-spacing' and 'word-spacing' to next character, if needed. 628 if (spacing) 629 applySpacingToNextCharacter = true; 630 631 float xNew = x - m_dx; 632 float yNew = y - m_dy; 633 634 if (m_isVerticalText) 635 xNew -= baselineShift; 636 else 637 yNew += baselineShift; 638 639 updateCurrentTextPosition(xNew, yNew, glyphAdvance + spacing); 640 } 641 642 advanceToNextLogicalCharacter(logicalMetrics); 643 advanceToNextVisualCharacter(visualMetrics); 644 lastAngle = angle; 645 } 646 647 if (!didStartTextFragment) 648 return; 649 650 // Close last open fragment, if needed. 651 recordTextFragment(textBox, visualMetricsValues); 652 } 653 654 } 655