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1 /* | 1 /* |
2 * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved. | 2 * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved. |
3 * | 3 * |
4 * This library is free software; you can redistribute it and/or | 4 * This library is free software; you can redistribute it and/or |
5 * modify it under the terms of the GNU Library General Public | 5 * modify it under the terms of the GNU Library General Public |
6 * License as published by the Free Software Foundation; either | 6 * License as published by the Free Software Foundation; either |
7 * version 2 of the License, or (at your option) any later version. | 7 * version 2 of the License, or (at your option) any later version. |
8 * | 8 * |
9 * This library is distributed in the hope that it will be useful, | 9 * This library is distributed in the hope that it will be useful, |
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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38 , m_layoutAttributesPosition(0) | 38 , m_layoutAttributesPosition(0) |
39 , m_logicalCharacterOffset(0) | 39 , m_logicalCharacterOffset(0) |
40 , m_logicalMetricsListOffset(0) | 40 , m_logicalMetricsListOffset(0) |
41 , m_x(0) | 41 , m_x(0) |
42 , m_y(0) | 42 , m_y(0) |
43 , m_dx(0) | 43 , m_dx(0) |
44 , m_dy(0) | 44 , m_dy(0) |
45 , m_isVerticalText(false) | 45 , m_isVerticalText(false) |
46 , m_inPathLayout(false) | 46 , m_inPathLayout(false) |
47 , m_textLengthSpacingInEffect(false) | 47 , m_textLengthSpacingInEffect(false) |
48 , m_textPathCalculator(nullptr) | 48 , m_textPath(nullptr) |
49 , m_textPathLength(0) | |
50 , m_textPathCurrentOffset(0) | 49 , m_textPathCurrentOffset(0) |
51 , m_textPathSpacing(0) | 50 , m_textPathSpacing(0) |
52 , m_textPathScaling(1) | 51 , m_textPathScaling(1) |
53 { | 52 { |
54 ASSERT(!m_layoutAttributes.isEmpty()); | 53 ASSERT(!m_layoutAttributes.isEmpty()); |
55 } | 54 } |
56 | 55 |
| 56 SVGTextLayoutEngine::~SVGTextLayoutEngine() = default; |
| 57 |
57 void SVGTextLayoutEngine::updateCharacterPositionIfNeeded(float& x, float& y) | 58 void SVGTextLayoutEngine::updateCharacterPositionIfNeeded(float& x, float& y) |
58 { | 59 { |
59 if (m_inPathLayout) | 60 if (m_inPathLayout) |
60 return; | 61 return; |
61 | 62 |
62 // Replace characters x/y position, with the current text position plus any | 63 // Replace characters x/y position, with the current text position plus any |
63 // relative adjustments, if it doesn't specify an absolute position itself. | 64 // relative adjustments, if it doesn't specify an absolute position itself. |
64 if (SVGTextLayoutAttributes::isEmptyValue(x)) | 65 if (SVGTextLayoutAttributes::isEmptyValue(x)) |
65 x = m_x + m_dx; | 66 x = m_x + m_dx; |
66 | 67 |
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167 { | 168 { |
168 // Build text chunks for all <textPath> children, using the line layout algo
rithm. | 169 // Build text chunks for all <textPath> children, using the line layout algo
rithm. |
169 // This is needeed as text-anchor is just an additional startOffset for text
paths. | 170 // This is needeed as text-anchor is just an additional startOffset for text
paths. |
170 SVGTextLayoutEngine lineLayout(m_layoutAttributes); | 171 SVGTextLayoutEngine lineLayout(m_layoutAttributes); |
171 lineLayout.m_textLengthSpacingInEffect = m_textLengthSpacingInEffect; | 172 lineLayout.m_textLengthSpacingInEffect = m_textLengthSpacingInEffect; |
172 lineLayout.layoutCharactersInTextBoxes(flowBox); | 173 lineLayout.layoutCharactersInTextBoxes(flowBox); |
173 | 174 |
174 m_inPathLayout = true; | 175 m_inPathLayout = true; |
175 LineLayoutSVGTextPath textPath = LineLayoutSVGTextPath(flowBox->lineLayoutIt
em()); | 176 LineLayoutSVGTextPath textPath = LineLayoutSVGTextPath(flowBox->lineLayoutIt
em()); |
176 | 177 |
177 Path path = textPath.layoutPath(); | 178 m_textPath = textPath.layoutPath(); |
178 if (path.isEmpty()) | 179 if (!m_textPath) |
179 return; | 180 return; |
180 m_textPathCalculator = new Path::PositionCalculator(path); | 181 m_textPathStartOffset = textPath.calculateStartOffset(m_textPath->length()); |
181 m_textPathLength = path.length(); | |
182 m_textPathStartOffset = textPath.calculateStartOffset(m_textPathLength); | |
183 | 182 |
184 SVGTextPathChunkBuilder textPathChunkLayoutBuilder; | 183 SVGTextPathChunkBuilder textPathChunkLayoutBuilder; |
185 textPathChunkLayoutBuilder.processTextChunks(lineLayout.m_lineLayoutBoxes); | 184 textPathChunkLayoutBuilder.processTextChunks(lineLayout.m_lineLayoutBoxes); |
186 | 185 |
187 m_textPathStartOffset += textPathChunkLayoutBuilder.totalTextAnchorShift(); | 186 m_textPathStartOffset += textPathChunkLayoutBuilder.totalTextAnchorShift(); |
188 m_textPathCurrentOffset = m_textPathStartOffset; | 187 m_textPathCurrentOffset = m_textPathStartOffset; |
189 | 188 |
190 // Eventually handle textLength adjustments. | 189 // Eventually handle textLength adjustments. |
191 SVGLengthAdjustType lengthAdjust = SVGLengthAdjustUnknown; | 190 SVGLengthAdjustType lengthAdjust = SVGLengthAdjustUnknown; |
192 float desiredTextLength = 0; | 191 float desiredTextLength = 0; |
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206 float totalLength = textPathChunkLayoutBuilder.totalLength(); | 205 float totalLength = textPathChunkLayoutBuilder.totalLength(); |
207 if (lengthAdjust == SVGLengthAdjustSpacing) | 206 if (lengthAdjust == SVGLengthAdjustSpacing) |
208 m_textPathSpacing = (desiredTextLength - totalLength) / textPathChunkLay
outBuilder.totalCharacters(); | 207 m_textPathSpacing = (desiredTextLength - totalLength) / textPathChunkLay
outBuilder.totalCharacters(); |
209 else | 208 else |
210 m_textPathScaling = desiredTextLength / totalLength; | 209 m_textPathScaling = desiredTextLength / totalLength; |
211 } | 210 } |
212 | 211 |
213 void SVGTextLayoutEngine::endTextPathLayout() | 212 void SVGTextLayoutEngine::endTextPathLayout() |
214 { | 213 { |
215 m_inPathLayout = false; | 214 m_inPathLayout = false; |
216 delete m_textPathCalculator; | 215 m_textPath = nullptr; |
217 m_textPathCalculator = 0; | |
218 m_textPathLength = 0; | |
219 m_textPathStartOffset = 0; | 216 m_textPathStartOffset = 0; |
220 m_textPathCurrentOffset = 0; | 217 m_textPathCurrentOffset = 0; |
221 m_textPathSpacing = 0; | 218 m_textPathSpacing = 0; |
222 m_textPathScaling = 1; | 219 m_textPathScaling = 1; |
223 } | 220 } |
224 | 221 |
225 void SVGTextLayoutEngine::layoutInlineTextBox(SVGInlineTextBox* textBox) | 222 void SVGTextLayoutEngine::layoutInlineTextBox(SVGInlineTextBox* textBox) |
226 { | 223 { |
227 ASSERT(textBox); | 224 ASSERT(textBox); |
228 | 225 |
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343 } | 340 } |
344 | 341 |
345 void SVGTextLayoutEngine::advanceToNextLogicalCharacter(const SVGTextMetrics& lo
gicalMetrics) | 342 void SVGTextLayoutEngine::advanceToNextLogicalCharacter(const SVGTextMetrics& lo
gicalMetrics) |
346 { | 343 { |
347 ++m_logicalMetricsListOffset; | 344 ++m_logicalMetricsListOffset; |
348 m_logicalCharacterOffset += logicalMetrics.length(); | 345 m_logicalCharacterOffset += logicalMetrics.length(); |
349 } | 346 } |
350 | 347 |
351 void SVGTextLayoutEngine::layoutTextOnLineOrPath(SVGInlineTextBox* textBox, Line
LayoutSVGInlineText textLineLayout, const ComputedStyle& style) | 348 void SVGTextLayoutEngine::layoutTextOnLineOrPath(SVGInlineTextBox* textBox, Line
LayoutSVGInlineText textLineLayout, const ComputedStyle& style) |
352 { | 349 { |
353 if (m_inPathLayout && !m_textPathCalculator) | 350 if (m_inPathLayout && !m_textPath) |
354 return; | 351 return; |
355 | 352 |
356 // Find the start of the current text box in the metrics list. | 353 // Find the start of the current text box in the metrics list. |
357 m_visualMetricsIterator.advanceToTextStart(textLineLayout, textBox->start())
; | 354 m_visualMetricsIterator.advanceToTextStart(textLineLayout, textBox->start())
; |
358 | 355 |
359 const Font& font = style.font(); | 356 const Font& font = style.font(); |
360 | 357 |
361 SVGTextLayoutEngineSpacing spacingLayout(font, style.effectiveZoom()); | 358 SVGTextLayoutEngineSpacing spacingLayout(font, style.effectiveZoom()); |
362 SVGTextLayoutEngineBaseline baselineLayout(font, style.effectiveZoom()); | 359 SVGTextLayoutEngineBaseline baselineLayout(font, style.effectiveZoom()); |
363 | 360 |
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415 | 412 |
416 // Assign current text position to x/y values, if needed. | 413 // Assign current text position to x/y values, if needed. |
417 updateCharacterPositionIfNeeded(x, y); | 414 updateCharacterPositionIfNeeded(x, y); |
418 | 415 |
419 // Apply dx/dy value adjustments to current text position, if needed. | 416 // Apply dx/dy value adjustments to current text position, if needed. |
420 updateRelativePositionAdjustmentsIfNeeded(data.dx, data.dy); | 417 updateRelativePositionAdjustmentsIfNeeded(data.dx, data.dy); |
421 | 418 |
422 // Calculate CSS 'letter-spacing' and 'word-spacing' for next character,
if needed. | 419 // Calculate CSS 'letter-spacing' and 'word-spacing' for next character,
if needed. |
423 float spacing = spacingLayout.calculateCSSSpacing(currentCharacter); | 420 float spacing = spacingLayout.calculateCSSSpacing(currentCharacter); |
424 | 421 |
425 float textPathOffset = 0; | |
426 float textPathShiftX = 0; | 422 float textPathShiftX = 0; |
427 float textPathShiftY = 0; | 423 float textPathShiftY = 0; |
428 if (m_inPathLayout) { | 424 if (m_inPathLayout) { |
429 float scaledGlyphAdvance = glyphAdvance * m_textPathScaling; | 425 float scaledGlyphAdvance = glyphAdvance * m_textPathScaling; |
430 if (m_isVerticalText) { | 426 if (m_isVerticalText) { |
431 // If there's an absolute y position available, it marks the beg
inning of a new position along the path. | 427 // If there's an absolute y position available, it marks the beg
inning of a new position along the path. |
432 if (!SVGTextLayoutAttributes::isEmptyValue(y)) | 428 if (!SVGTextLayoutAttributes::isEmptyValue(y)) |
433 m_textPathCurrentOffset = y + m_textPathStartOffset; | 429 m_textPathCurrentOffset = y + m_textPathStartOffset; |
434 | 430 |
435 m_textPathCurrentOffset += m_dy; | 431 m_textPathCurrentOffset += m_dy; |
436 m_dy = 0; | 432 m_dy = 0; |
437 | 433 |
438 // Apply dx/dy correction and setup translations that move to th
e glyph midpoint. | 434 // Apply dx/dy correction and setup translations that move to th
e glyph midpoint. |
439 textPathShiftX += m_dx + baselineShift; | 435 textPathShiftX += m_dx + baselineShift; |
440 textPathShiftY -= scaledGlyphAdvance / 2; | 436 textPathShiftY -= scaledGlyphAdvance / 2; |
441 } else { | 437 } else { |
442 // If there's an absolute x position available, it marks the beg
inning of a new position along the path. | 438 // If there's an absolute x position available, it marks the beg
inning of a new position along the path. |
443 if (!SVGTextLayoutAttributes::isEmptyValue(x)) | 439 if (!SVGTextLayoutAttributes::isEmptyValue(x)) |
444 m_textPathCurrentOffset = x + m_textPathStartOffset; | 440 m_textPathCurrentOffset = x + m_textPathStartOffset; |
445 | 441 |
446 m_textPathCurrentOffset += m_dx; | 442 m_textPathCurrentOffset += m_dx; |
447 m_dx = 0; | 443 m_dx = 0; |
448 | 444 |
449 // Apply dx/dy correction and setup translations that move to th
e glyph midpoint. | 445 // Apply dx/dy correction and setup translations that move to th
e glyph midpoint. |
450 textPathShiftX -= scaledGlyphAdvance / 2; | 446 textPathShiftX -= scaledGlyphAdvance / 2; |
451 textPathShiftY += m_dy - baselineShift; | 447 textPathShiftY += m_dy - baselineShift; |
452 } | 448 } |
453 | 449 |
454 // Calculate current offset along path. | 450 // Calculate current offset along path. |
455 textPathOffset = m_textPathCurrentOffset + scaledGlyphAdvance / 2; | 451 float textPathOffset = m_textPathCurrentOffset + scaledGlyphAdvance
/ 2; |
456 | 452 |
457 // Move to next character. | 453 // Move to next character. |
458 m_textPathCurrentOffset += scaledGlyphAdvance + m_textPathSpacing +
spacing * m_textPathScaling; | 454 m_textPathCurrentOffset += scaledGlyphAdvance + m_textPathSpacing +
spacing * m_textPathScaling; |
459 | 455 |
| 456 FloatPoint point; |
| 457 PathPositionMapper::PositionType positionType = m_textPath->pointAnd
NormalAtLength(textPathOffset, point, angle); |
| 458 |
460 // Skip character, if we're before the path. | 459 // Skip character, if we're before the path. |
461 if (textPathOffset < 0) { | 460 if (positionType == PathPositionMapper::BeforePath) { |
462 advanceToNextLogicalCharacter(logicalMetrics); | 461 advanceToNextLogicalCharacter(logicalMetrics); |
463 m_visualMetricsIterator.next(); | 462 m_visualMetricsIterator.next(); |
464 continue; | 463 continue; |
465 } | 464 } |
466 | 465 |
467 // Stop processing, if the next character lies behind the path. | 466 // Stop processing if the next character lies behind the path. |
468 if (textPathOffset > m_textPathLength) | 467 if (positionType == PathPositionMapper::AfterPath) |
469 break; | 468 break; |
470 | 469 |
471 FloatPoint point; | |
472 m_textPathCalculator->pointAndNormalAtLength(textPathOffset, point,
angle); | |
473 x = point.x(); | 470 x = point.x(); |
474 y = point.y(); | 471 y = point.y(); |
475 | 472 |
476 // For vertical text on path, the actual angle has to be rotated 90
degrees anti-clockwise, not the orientation angle! | 473 // For vertical text on path, the actual angle has to be rotated 90
degrees anti-clockwise, not the orientation angle! |
477 if (m_isVerticalText) | 474 if (m_isVerticalText) |
478 angle -= 90; | 475 angle -= 90; |
479 } else { | 476 } else { |
480 // Apply all previously calculated shift values. | 477 // Apply all previously calculated shift values. |
481 if (m_isVerticalText) | 478 if (m_isVerticalText) |
482 x += baselineShift; | 479 x += baselineShift; |
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551 } | 548 } |
552 | 549 |
553 if (!didStartTextFragment) | 550 if (!didStartTextFragment) |
554 return; | 551 return; |
555 | 552 |
556 // Close last open fragment, if needed. | 553 // Close last open fragment, if needed. |
557 recordTextFragment(textBox); | 554 recordTextFragment(textBox); |
558 } | 555 } |
559 | 556 |
560 } // namespace blink | 557 } // namespace blink |
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