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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkTextBlob.h" | 8 #include "SkTextBlob.h" |
9 | 9 |
10 #include "SkReadBuffer.h" | 10 #include "SkReadBuffer.h" |
| 11 #include "SkTypeface.h" |
11 #include "SkWriteBuffer.h" | 12 #include "SkWriteBuffer.h" |
12 | 13 |
13 // | 14 // |
14 // Textblob data is laid out into externally-managed storage as follows: | 15 // Textblob data is laid out into externally-managed storage as follows: |
15 // | 16 // |
16 // --------------------------------------------------------------------------
--- | 17 // --------------------------------------------------------------------------
--- |
17 // | SkTextBlob | RunRecord | Glyphs[] | Pos[] | RunRecord | Glyphs[] | Pos[]
| ... | 18 // | SkTextBlob | RunRecord | Glyphs[] | Pos[] | RunRecord | Glyphs[] | Pos[]
| ... |
18 // --------------------------------------------------------------------------
--- | 19 // --------------------------------------------------------------------------
--- |
19 // | 20 // |
20 // Each run record describes a text blob run, and can be used to determine the
(implicit) | 21 // Each run record describes a text blob run, and can be used to determine the
(implicit) |
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297 } | 298 } |
298 | 299 |
299 SkTextBlobBuilder::~SkTextBlobBuilder() { | 300 SkTextBlobBuilder::~SkTextBlobBuilder() { |
300 if (NULL != fStorage.get()) { | 301 if (NULL != fStorage.get()) { |
301 // We are abandoning runs and must destruct the associated font data. | 302 // We are abandoning runs and must destruct the associated font data. |
302 // The easiest way to accomplish that is to use the blob destructor. | 303 // The easiest way to accomplish that is to use the blob destructor. |
303 build()->unref(); | 304 build()->unref(); |
304 } | 305 } |
305 } | 306 } |
306 | 307 |
| 308 SkRect SkTextBlobBuilder::TightRunBounds(const SkTextBlob::RunRecord& run) { |
| 309 SkRect bounds; |
| 310 |
| 311 if (SkTextBlob::kDefault_Positioning == run.positioning()) { |
| 312 run.font().measureText(run.glyphBuffer(), run.glyphCount() * sizeof(uint
16_t), &bounds); |
| 313 return bounds; |
| 314 } |
| 315 |
| 316 SkASSERT(SkTextBlob::kFull_Positioning == run.positioning() || |
| 317 SkTextBlob::kHorizontal_Positioning == run.positioning()); |
| 318 |
| 319 SkAutoSTArray<16, SkRect> glyphBounds(run.glyphCount()); |
| 320 run.font().getTextWidths(run.glyphBuffer(), |
| 321 run.glyphCount() * sizeof(uint16_t), |
| 322 NULL, |
| 323 glyphBounds.get()); |
| 324 |
| 325 bounds = SkRect::MakeEmpty(); |
| 326 SkScalar* glyphPos = run.posBuffer(); |
| 327 for (unsigned i = 0; i < run.glyphCount(); ++i) { |
| 328 if (SkTextBlob::kFull_Positioning == run.positioning()) { |
| 329 // [ x, y, x, y... ] |
| 330 glyphBounds[i].offset(glyphPos[0], glyphPos[1]); |
| 331 SkASSERT(2 == SkTextBlob::ScalarsPerGlyph(run.positioning())); |
| 332 glyphPos += 2; |
| 333 } else { |
| 334 // [ x, x, x... ], const y applied by runBounds.offset(run->offset()
) later. |
| 335 glyphBounds[i].offset(glyphPos[0], 0); |
| 336 SkASSERT(1 == SkTextBlob::ScalarsPerGlyph(run.positioning())); |
| 337 glyphPos += 1; |
| 338 } |
| 339 |
| 340 bounds.join(glyphBounds[i]); |
| 341 } |
| 342 |
| 343 SkASSERT((void*)glyphPos <= SkTextBlob::RunRecord::Next(&run)); |
| 344 |
| 345 return bounds.makeOffset(run.offset().x(), run.offset().y()); |
| 346 } |
| 347 |
| 348 SkRect SkTextBlobBuilder::ConservativeRunBounds(const SkTextBlob::RunRecord& run
) { |
| 349 const SkScalar* glyphPos = run.posBuffer(); |
| 350 int posScalars = SkTextBlob::ScalarsPerGlyph(run.positioning()); |
| 351 |
| 352 SkASSERT(1 == posScalars || 2 == posScalars); |
| 353 SkASSERT(run.glyphCount() > 0); |
| 354 SkASSERT((void*)(glyphPos + run.glyphCount() * posScalars) <= |
| 355 SkTextBlob::RunRecord::Next(&run)); |
| 356 |
| 357 // First, compute the glyph position bbox. |
| 358 SkRect bounds = SkRect::MakeXYWH(glyphPos[0], (2 == posScalars) ? glyphPos[1
] : 0, 0, 0); |
| 359 for (unsigned i = 1; i < run.glyphCount(); ++i) { |
| 360 SkScalar xpos = glyphPos[i * posScalars]; |
| 361 SkScalar ypos = (2 == posScalars) ? glyphPos[i * posScalars + 1] : 0; |
| 362 bounds.growToInclude(xpos, ypos); |
| 363 } |
| 364 |
| 365 // Expand by typeface glyph bounds. |
| 366 const SkRect fontBounds = run.font().getFontBounds(); |
| 367 bounds.fLeft += fontBounds.left(); |
| 368 bounds.fTop += fontBounds.top(); |
| 369 bounds.fRight += fontBounds.right(); |
| 370 bounds.fBottom += fontBounds.bottom(); |
| 371 |
| 372 // Offset by run position. |
| 373 return bounds.makeOffset(run.offset().x(), run.offset().y()); |
| 374 } |
| 375 |
307 void SkTextBlobBuilder::updateDeferredBounds() { | 376 void SkTextBlobBuilder::updateDeferredBounds() { |
308 SkASSERT(!fDeferredBounds || fRunCount > 0); | 377 SkASSERT(!fDeferredBounds || fRunCount > 0); |
309 | 378 |
310 if (!fDeferredBounds) { | 379 if (!fDeferredBounds) { |
311 return; | 380 return; |
312 } | 381 } |
313 | 382 |
314 SkASSERT(fLastRun >= sizeof(SkTextBlob)); | 383 SkASSERT(fLastRun >= sizeof(SkTextBlob)); |
315 SkTextBlob::RunRecord* run = reinterpret_cast<SkTextBlob::RunRecord*>(fStora
ge.get() + | 384 SkTextBlob::RunRecord* run = reinterpret_cast<SkTextBlob::RunRecord*>(fStora
ge.get() + |
316 fLastR
un); | 385 fLastR
un); |
317 SkASSERT(SkPaint::kGlyphID_TextEncoding == run->font().getTextEncoding()); | 386 SkASSERT(SkPaint::kGlyphID_TextEncoding == run->font().getTextEncoding()); |
318 | 387 |
319 SkRect runBounds = SkRect::MakeEmpty(); | 388 SkRect runBounds; |
| 389 #ifdef SK_SUPPORT_LEGACY_BLOB_BOUNDS |
| 390 runBounds = TightRunBounds(*run); |
| 391 #else |
| 392 // FIXME: conservative bounds for default positioning? |
320 if (SkTextBlob::kDefault_Positioning == run->positioning()) { | 393 if (SkTextBlob::kDefault_Positioning == run->positioning()) { |
321 run->font().measureText(run->glyphBuffer(), | 394 runBounds = TightRunBounds(*run); |
322 run->glyphCount() * sizeof(uint16_t), | |
323 &runBounds); | |
324 } else { | 395 } else { |
325 SkASSERT(SkTextBlob::kFull_Positioning == run->positioning() || | 396 runBounds = ConservativeRunBounds(*run); |
326 SkTextBlob::kHorizontal_Positioning == run->positioning()); | |
327 | |
328 SkAutoSTArray<16, SkRect> glyphBounds(run->glyphCount()); | |
329 run->font().getTextWidths(run->glyphBuffer(), | |
330 run->glyphCount() * sizeof(uint16_t), | |
331 NULL, | |
332 glyphBounds.get()); | |
333 | |
334 SkScalar* glyphOffset = run->posBuffer(); | |
335 for (unsigned i = 0; i < run->glyphCount(); ++i) { | |
336 if (SkTextBlob::kFull_Positioning == run->positioning()) { | |
337 // [ x, y, x, y... ] | |
338 glyphBounds[i].offset(glyphOffset[0], glyphOffset[1]); | |
339 SkASSERT(2 == SkTextBlob::ScalarsPerGlyph(run->positioning())); | |
340 glyphOffset += 2; | |
341 } else { | |
342 // [ x, x, x... ], const y applied by runBounds.offset(run->offs
et()) later. | |
343 glyphBounds[i].offset(glyphOffset[0], 0); | |
344 SkASSERT(1 == SkTextBlob::ScalarsPerGlyph(run->positioning())); | |
345 glyphOffset += 1; | |
346 } | |
347 | |
348 runBounds.join(glyphBounds[i]); | |
349 } | |
350 | |
351 SkASSERT((void*)glyphOffset <= SkTextBlob::RunRecord::Next(run)); | |
352 } | 397 } |
353 | 398 #endif |
354 runBounds.offset(run->offset()); | |
355 | 399 |
356 fBounds.join(runBounds); | 400 fBounds.join(runBounds); |
357 fDeferredBounds = false; | 401 fDeferredBounds = false; |
358 } | 402 } |
359 | 403 |
360 void SkTextBlobBuilder::reserve(size_t size) { | 404 void SkTextBlobBuilder::reserve(size_t size) { |
361 // We don't currently pre-allocate, but maybe someday... | 405 // We don't currently pre-allocate, but maybe someday... |
362 if (fStorageUsed + size <= fStorageSize) { | 406 if (fStorageUsed + size <= fStorageSize) { |
363 return; | 407 return; |
364 } | 408 } |
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517 | 561 |
518 fStorageUsed = 0; | 562 fStorageUsed = 0; |
519 fStorageSize = 0; | 563 fStorageSize = 0; |
520 fRunCount = 0; | 564 fRunCount = 0; |
521 fLastRun = 0; | 565 fLastRun = 0; |
522 fBounds.setEmpty(); | 566 fBounds.setEmpty(); |
523 | 567 |
524 return blob; | 568 return blob; |
525 } | 569 } |
526 | 570 |
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