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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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161 collectTextBoxesInLogicalOrder(textLineLayout, textBoxes); | 161 collectTextBoxesInLogicalOrder(textLineLayout, textBoxes); |
162 | 162 |
163 for (const SVGInlineTextBox* textBox : textBoxes) { | 163 for (const SVGInlineTextBox* textBox : textBoxes) { |
164 if (queryTextBox(queryData, textBox, fragmentCallback)) | 164 if (queryTextBox(queryData, textBox, fragmentCallback)) |
165 return; | 165 return; |
166 queryData->currentOffset += textBox->len(); | 166 queryData->currentOffset += textBox->len(); |
167 } | 167 } |
168 } | 168 } |
169 } | 169 } |
170 | 170 |
171 static void modifyStartEndPositionsRespectingLigatures(const QueryData* queryDat
a, const SVGTextFragment& fragment, int& startPosition, int& endPosition) | |
172 { | |
173 const Vector<SVGTextMetrics>& textMetricsValues = queryData->textLineLayout.
layoutAttributes()->textMetricsValues(); | |
174 | |
175 unsigned textMetricsOffset = fragment.metricsListOffset; | |
176 int fragmentOffset = 0; | |
177 int fragmentEnd = static_cast<int>(fragment.length); | |
178 | |
179 // Find the text metrics cell that start at or contain the character startPo
sition. | |
180 while (fragmentOffset < fragmentEnd) { | |
181 const SVGTextMetrics& metrics = textMetricsValues[textMetricsOffset]; | |
182 int glyphEnd = fragmentOffset + metrics.length(); | |
183 if (startPosition < glyphEnd) | |
184 break; | |
185 fragmentOffset = glyphEnd; | |
186 textMetricsOffset++; | |
187 } | |
188 | |
189 startPosition = fragmentOffset; | |
190 | |
191 // Find the text metrics cell that contain or ends at the character endPosit
ion. | |
192 while (fragmentOffset < fragmentEnd) { | |
193 const SVGTextMetrics& metrics = textMetricsValues[textMetricsOffset]; | |
194 fragmentOffset += metrics.length(); | |
195 if (fragmentOffset >= endPosition) | |
196 break; | |
197 textMetricsOffset++; | |
198 } | |
199 | |
200 endPosition = fragmentOffset; | |
201 } | |
202 | |
203 static bool mapStartEndPositionsIntoFragmentCoordinates(const QueryData* queryDa
ta, const SVGTextFragment& fragment, int& startPosition, int& endPosition) | 171 static bool mapStartEndPositionsIntoFragmentCoordinates(const QueryData* queryDa
ta, const SVGTextFragment& fragment, int& startPosition, int& endPosition) |
204 { | 172 { |
205 unsigned boxStart = queryData->currentOffset; | 173 unsigned boxStart = queryData->currentOffset; |
206 | 174 |
207 // Make <startPosition, endPosition> offsets relative to the current text bo
x. | 175 // Make <startPosition, endPosition> offsets relative to the current text bo
x. |
208 startPosition -= boxStart; | 176 startPosition -= boxStart; |
209 endPosition -= boxStart; | 177 endPosition -= boxStart; |
210 | 178 |
211 // Reuse the same logic used for text selection & painting, to map our | 179 // Reuse the same logic used for text selection & painting, to map our |
212 // query start/length into start/endPositions of the current text fragment. | 180 // query start/length into start/endPositions of the current text fragment. |
213 if (!queryData->textBox->mapStartEndPositionsIntoFragmentCoordinates(fragmen
t, startPosition, endPosition)) | 181 return queryData->textBox->mapStartEndPositionsIntoFragmentCoordinates(fragm
ent, startPosition, endPosition); |
214 return false; | |
215 | |
216 modifyStartEndPositionsRespectingLigatures(queryData, fragment, startPositio
n, endPosition); | |
217 ASSERT(startPosition < endPosition); | |
218 return true; | |
219 } | 182 } |
220 | 183 |
221 // numberOfCharacters() implementation | 184 // numberOfCharacters() implementation |
222 static bool numberOfCharactersCallback(QueryData*, const SVGTextFragment&) | 185 static bool numberOfCharactersCallback(QueryData*, const SVGTextFragment&) |
223 { | 186 { |
224 // no-op | 187 // no-op |
225 return false; | 188 return false; |
226 } | 189 } |
227 | 190 |
228 unsigned SVGTextQuery::numberOfCharacters() const | 191 unsigned SVGTextQuery::numberOfCharacters() const |
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249 return false; | 212 return false; |
250 } | 213 } |
251 | 214 |
252 float SVGTextQuery::textLength() const | 215 float SVGTextQuery::textLength() const |
253 { | 216 { |
254 TextLengthData data; | 217 TextLengthData data; |
255 logicalQuery(m_queryRootLayoutObject, &data, textLengthCallback); | 218 logicalQuery(m_queryRootLayoutObject, &data, textLengthCallback); |
256 return data.textLength; | 219 return data.textLength; |
257 } | 220 } |
258 | 221 |
259 const SVGTextMetrics& findMetricsForCharacter(const Vector<SVGTextMetrics>& text
MetricsValues, const SVGTextFragment& fragment, unsigned startInFragment) | 222 using MetricsList = Vector<SVGTextMetrics>; |
| 223 |
| 224 MetricsList::const_iterator findMetricsForCharacter(const MetricsList& metricsLi
st, const SVGTextFragment& fragment, unsigned startInFragment) |
260 { | 225 { |
261 // Find the text metrics cell that starts at or contains the character at |s
tartInFragment|. | 226 // Find the text metrics cell that starts at or contains the character at |s
tartInFragment|. |
262 unsigned textMetricsOffset = fragment.metricsListOffset; | 227 MetricsList::const_iterator metrics = metricsList.begin() + fragment.metrics
ListOffset; |
263 unsigned fragmentOffset = 0; | 228 unsigned fragmentOffset = 0; |
264 while (fragmentOffset < fragment.length) { | 229 while (fragmentOffset < fragment.length) { |
265 const SVGTextMetrics& metrics = textMetricsValues[textMetricsOffset++]; | 230 fragmentOffset += metrics->length(); |
266 unsigned glyphEnd = fragmentOffset + metrics.length(); | 231 if (startInFragment < fragmentOffset) |
267 if (startInFragment < glyphEnd) | |
268 break; | 232 break; |
269 fragmentOffset = glyphEnd; | 233 ++metrics; |
270 } | 234 } |
271 return textMetricsValues[textMetricsOffset - 1]; | 235 ASSERT(metrics <= metricsList.end()); |
| 236 return metrics; |
272 } | 237 } |
273 | 238 |
274 static float calculateGlyphRange(const QueryData* queryData, const SVGTextFragme
nt& fragment, unsigned start, unsigned end) | 239 static float calculateGlyphRange(const QueryData* queryData, const SVGTextFragme
nt& fragment, unsigned start, unsigned end) |
275 { | 240 { |
| 241 const MetricsList& metricsList = queryData->textLineLayout.layoutAttributes(
)->textMetricsValues(); |
| 242 auto metrics = findMetricsForCharacter(metricsList, fragment, start); |
| 243 auto endMetrics = findMetricsForCharacter(metricsList, fragment, end); |
276 float glyphRange = 0; | 244 float glyphRange = 0; |
277 const Vector<SVGTextMetrics>& textMetricsValues = queryData->textLineLayout.
layoutAttributes()->textMetricsValues(); | 245 for (; metrics != endMetrics; ++metrics) |
278 for (unsigned character = start; character < end; character++) { | 246 glyphRange += queryData->isVerticalText ? metrics->height() : metrics->w
idth(); |
279 const SVGTextMetrics& metrics = findMetricsForCharacter(textMetricsValue
s, fragment, character); | |
280 glyphRange += queryData->isVerticalText ? metrics.height() : metrics.wid
th(); | |
281 } | |
282 return glyphRange; | 247 return glyphRange; |
283 } | 248 } |
284 | 249 |
285 // subStringLength() implementation | 250 // subStringLength() implementation |
286 struct SubStringLengthData : QueryData { | 251 struct SubStringLengthData : QueryData { |
287 SubStringLengthData(unsigned queryStartPosition, unsigned queryLength) | 252 SubStringLengthData(unsigned queryStartPosition, unsigned queryLength) |
288 : startPosition(queryStartPosition) | 253 : startPosition(queryStartPosition) |
289 , length(queryLength) | 254 , length(queryLength) |
290 , subStringLength(0) | 255 , subStringLength(0) |
291 { | 256 { |
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321 struct StartPositionOfCharacterData : QueryData { | 286 struct StartPositionOfCharacterData : QueryData { |
322 StartPositionOfCharacterData(unsigned queryPosition) | 287 StartPositionOfCharacterData(unsigned queryPosition) |
323 : position(queryPosition) | 288 : position(queryPosition) |
324 { | 289 { |
325 } | 290 } |
326 | 291 |
327 unsigned position; | 292 unsigned position; |
328 FloatPoint startPosition; | 293 FloatPoint startPosition; |
329 }; | 294 }; |
330 | 295 |
331 static FloatPoint calculateGlyphPositionWithoutTransform(const QueryData* queryD
ata, const SVGTextFragment& fragment, int offsetInFragment) | 296 static FloatPoint calculateGlyphPositionWithoutTransform(const QueryData* queryD
ata, const SVGTextFragment& fragment, unsigned offsetInFragment) |
332 { | 297 { |
333 float glyphOffsetInDirection = calculateGlyphRange(queryData, fragment, 0, o
ffsetInFragment); | 298 float glyphOffsetInDirection = calculateGlyphRange(queryData, fragment, 0, o
ffsetInFragment); |
334 | 299 |
335 if (!queryData->textBox->isLeftToRightDirection()) { | 300 if (!queryData->textBox->isLeftToRightDirection()) { |
336 float fragmentExtent = queryData->isVerticalText ? fragment.height : fra
gment.width; | 301 float fragmentExtent = queryData->isVerticalText ? fragment.height : fra
gment.width; |
337 glyphOffsetInDirection = fragmentExtent - glyphOffsetInDirection; | 302 glyphOffsetInDirection = fragmentExtent - glyphOffsetInDirection; |
338 } | 303 } |
339 | 304 |
340 FloatPoint glyphPosition(fragment.x, fragment.y); | 305 FloatPoint glyphPosition(fragment.x, fragment.y); |
341 if (queryData->isVerticalText) | 306 if (queryData->isVerticalText) |
342 glyphPosition.move(0, glyphOffsetInDirection); | 307 glyphPosition.move(0, glyphOffsetInDirection); |
343 else | 308 else |
344 glyphPosition.move(glyphOffsetInDirection, 0); | 309 glyphPosition.move(glyphOffsetInDirection, 0); |
345 | 310 |
346 return glyphPosition; | 311 return glyphPosition; |
347 } | 312 } |
348 | 313 |
349 static FloatPoint calculateGlyphPosition(const QueryData* queryData, const SVGTe
xtFragment& fragment, int offsetInFragment) | 314 static FloatPoint calculateGlyphPosition(const QueryData* queryData, const SVGTe
xtFragment& fragment, unsigned offsetInFragment) |
350 { | 315 { |
351 FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData,
fragment, offsetInFragment); | 316 FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData,
fragment, offsetInFragment); |
352 if (fragment.isTransformed()) { | 317 if (fragment.isTransformed()) { |
353 AffineTransform fragmentTransform = fragment.buildFragmentTransform(SVGT
extFragment::TransformIgnoringTextLength); | 318 AffineTransform fragmentTransform = fragment.buildFragmentTransform(SVGT
extFragment::TransformIgnoringTextLength); |
354 glyphPosition = fragmentTransform.mapPoint(glyphPosition); | 319 glyphPosition = fragmentTransform.mapPoint(glyphPosition); |
355 } | 320 } |
356 return glyphPosition; | 321 return glyphPosition; |
357 } | 322 } |
358 | 323 |
359 static bool startPositionOfCharacterCallback(QueryData* queryData, const SVGText
Fragment& fragment) | 324 static bool startPositionOfCharacterCallback(QueryData* queryData, const SVGText
Fragment& fragment) |
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389 | 354 |
390 static bool endPositionOfCharacterCallback(QueryData* queryData, const SVGTextFr
agment& fragment) | 355 static bool endPositionOfCharacterCallback(QueryData* queryData, const SVGTextFr
agment& fragment) |
391 { | 356 { |
392 EndPositionOfCharacterData* data = static_cast<EndPositionOfCharacterData*>(
queryData); | 357 EndPositionOfCharacterData* data = static_cast<EndPositionOfCharacterData*>(
queryData); |
393 | 358 |
394 int startPosition = data->position; | 359 int startPosition = data->position; |
395 int endPosition = startPosition + 1; | 360 int endPosition = startPosition + 1; |
396 if (!mapStartEndPositionsIntoFragmentCoordinates(queryData, fragment, startP
osition, endPosition)) | 361 if (!mapStartEndPositionsIntoFragmentCoordinates(queryData, fragment, startP
osition, endPosition)) |
397 return false; | 362 return false; |
398 | 363 |
399 // TODO(fs): mapStartEndPositionsIntoFragmentCoordinates(...) above applies | 364 data->endPosition = calculateGlyphPosition(queryData, fragment, endPosition)
; |
400 // some heuristics for ligatures, so why not just use endPosition here? | |
401 // (rather than startPosition+1) | |
402 data->endPosition = calculateGlyphPosition(queryData, fragment, startPositio
n + 1); | |
403 return true; | 365 return true; |
404 } | 366 } |
405 | 367 |
406 FloatPoint SVGTextQuery::endPositionOfCharacter(unsigned position) const | 368 FloatPoint SVGTextQuery::endPositionOfCharacter(unsigned position) const |
407 { | 369 { |
408 EndPositionOfCharacterData data(position); | 370 EndPositionOfCharacterData data(position); |
409 logicalQuery(m_queryRootLayoutObject, &data, endPositionOfCharacterCallback)
; | 371 logicalQuery(m_queryRootLayoutObject, &data, endPositionOfCharacterCallback)
; |
410 return data.endPosition; | 372 return data.endPosition; |
411 } | 373 } |
412 | 374 |
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463 { | 425 { |
464 float scalingFactor = queryData->textLineLayout.scalingFactor(); | 426 float scalingFactor = queryData->textLineLayout.scalingFactor(); |
465 ASSERT(scalingFactor); | 427 ASSERT(scalingFactor); |
466 | 428 |
467 FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData,
fragment, startPosition); | 429 FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData,
fragment, startPosition); |
468 glyphPosition.move(0, -queryData->textLineLayout.scaledFont().getFontMetrics
().floatAscent() / scalingFactor); | 430 glyphPosition.move(0, -queryData->textLineLayout.scaledFont().getFontMetrics
().floatAscent() / scalingFactor); |
469 | 431 |
470 // Use the SVGTextMetrics computed by SVGTextMetricsBuilder (which spends | 432 // Use the SVGTextMetrics computed by SVGTextMetricsBuilder (which spends |
471 // time attempting to compute more correct glyph bounds already, handling | 433 // time attempting to compute more correct glyph bounds already, handling |
472 // cursive scripts to some degree.) | 434 // cursive scripts to some degree.) |
473 const Vector<SVGTextMetrics>& textMetricsValues = queryData->textLineLayout.
layoutAttributes()->textMetricsValues(); | 435 const MetricsList& textMetricsValues = queryData->textLineLayout.layoutAttri
butes()->textMetricsValues(); |
474 const SVGTextMetrics& metrics = findMetricsForCharacter(textMetricsValues, f
ragment, startPosition); | 436 auto metrics = findMetricsForCharacter(textMetricsValues, fragment, startPos
ition); |
475 | 437 |
476 // TODO(fs): Negative glyph extents seems kind of weird to have, but | 438 // TODO(fs): Negative glyph extents seems kind of weird to have, but |
477 // presently it can occur in some cases (like Arabic.) | 439 // presently it can occur in some cases (like Arabic.) |
478 FloatSize glyphSize(std::max<float>(metrics.width(), 0), std::max<float>(met
rics.height(), 0)); | 440 FloatSize glyphSize(std::max<float>(metrics->width(), 0), std::max<float>(me
trics->height(), 0)); |
479 | 441 |
480 // If RTL, adjust the starting point to align with the LHS of the glyph boun
ding box. | 442 // If RTL, adjust the starting point to align with the LHS of the glyph boun
ding box. |
481 if (!queryData->textBox->isLeftToRightDirection()) { | 443 if (!queryData->textBox->isLeftToRightDirection()) { |
482 if (queryData->isVerticalText) | 444 if (queryData->isVerticalText) |
483 glyphPosition.move(0, -glyphSize.height()); | 445 glyphPosition.move(0, -glyphSize.height()); |
484 else | 446 else |
485 glyphPosition.move(-glyphSize.width(), 0); | 447 glyphPosition.move(-glyphSize.width(), 0); |
486 } | 448 } |
487 | 449 |
488 FloatRect extent(glyphPosition, glyphSize); | 450 FloatRect extent(glyphPosition, glyphSize); |
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604 } | 566 } |
605 | 567 |
606 int SVGTextQuery::characterNumberAtPosition(const FloatPoint& position) const | 568 int SVGTextQuery::characterNumberAtPosition(const FloatPoint& position) const |
607 { | 569 { |
608 CharacterNumberAtPositionData data(position); | 570 CharacterNumberAtPositionData data(position); |
609 spatialQuery(m_queryRootLayoutObject, &data, characterNumberAtPositionCallba
ck); | 571 spatialQuery(m_queryRootLayoutObject, &data, characterNumberAtPositionCallba
ck); |
610 return data.characterNumberWithin(m_queryRootLayoutObject); | 572 return data.characterNumberWithin(m_queryRootLayoutObject); |
611 } | 573 } |
612 | 574 |
613 } // namespace blink | 575 } // namespace blink |
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