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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 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 "SkCodec_libgif.h" | 8 #include "SkCodec_libgif.h" |
9 #include "SkCodecPriv.h" | 9 #include "SkCodecPriv.h" |
10 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
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429 SkCodec::Result SkGifCodec::prepareToDecode(const SkImageInfo& dstInfo, SkPMColo
r* inputColorPtr, | 429 SkCodec::Result SkGifCodec::prepareToDecode(const SkImageInfo& dstInfo, SkPMColo
r* inputColorPtr, |
430 int* inputColorCount, const Options& opts) { | 430 int* inputColorCount, const Options& opts) { |
431 // Check for valid input parameters | 431 // Check for valid input parameters |
432 if (!conversion_possible(dstInfo, this->getInfo())) { | 432 if (!conversion_possible(dstInfo, this->getInfo())) { |
433 return gif_error("Cannot convert input type to output type.\n", | 433 return gif_error("Cannot convert input type to output type.\n", |
434 kInvalidConversion); | 434 kInvalidConversion); |
435 } | 435 } |
436 | 436 |
437 // Initialize color table and copy to the client if necessary | 437 // Initialize color table and copy to the client if necessary |
438 this->initializeColorTable(dstInfo, inputColorPtr, inputColorCount); | 438 this->initializeColorTable(dstInfo, inputColorPtr, inputColorCount); |
439 return kSuccess; | 439 |
| 440 return this->initializeSwizzler(dstInfo, opts); |
440 } | 441 } |
441 | 442 |
442 SkCodec::Result SkGifCodec::initializeSwizzler(const SkImageInfo& dstInfo, const
Options& opts) { | 443 SkCodec::Result SkGifCodec::initializeSwizzler(const SkImageInfo& dstInfo, const
Options& opts) { |
443 const SkPMColor* colorPtr = get_color_ptr(fColorTable.get()); | 444 const SkPMColor* colorPtr = get_color_ptr(fColorTable.get()); |
444 fSwizzler.reset(SkSwizzler::CreateSwizzler(SkSwizzler::kIndex, colorPtr, dst
Info, opts)); | 445 const SkIRect* frameRect = fFrameIsSubset ? &fFrameRect : nullptr; |
| 446 fSwizzler.reset(SkSwizzler::CreateSwizzler(SkSwizzler::kIndex, colorPtr, dst
Info, opts, |
| 447 frameRect)); |
| 448 |
445 if (nullptr != fSwizzler.get()) { | 449 if (nullptr != fSwizzler.get()) { |
446 return kSuccess; | 450 return kSuccess; |
447 } | 451 } |
448 return kUnimplemented; | 452 return kUnimplemented; |
449 } | 453 } |
450 | 454 |
451 bool SkGifCodec::readRow() { | 455 bool SkGifCodec::readRow() { |
452 return GIF_ERROR != DGifGetLine(fGif, fSrcBuffer.get(), fFrameRect.width()); | 456 return GIF_ERROR != DGifGetLine(fGif, fSrcBuffer.get(), fFrameRect.width()); |
453 } | 457 } |
454 | 458 |
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465 if (kSuccess != result) { | 469 if (kSuccess != result) { |
466 return result; | 470 return result; |
467 } | 471 } |
468 | 472 |
469 if (dstInfo.dimensions() != this->getInfo().dimensions()) { | 473 if (dstInfo.dimensions() != this->getInfo().dimensions()) { |
470 return gif_error("Scaling not supported.\n", kInvalidScale); | 474 return gif_error("Scaling not supported.\n", kInvalidScale); |
471 } | 475 } |
472 | 476 |
473 // Initialize the swizzler | 477 // Initialize the swizzler |
474 if (fFrameIsSubset) { | 478 if (fFrameIsSubset) { |
475 const SkImageInfo subsetDstInfo = dstInfo.makeWH(fFrameRect.width(), fFr
ameRect.height()); | |
476 if (kSuccess != this->initializeSwizzler(subsetDstInfo, opts)) { | |
477 return gif_error("Could not initialize swizzler.\n", kUnimplemented)
; | |
478 } | |
479 | |
480 // Fill the background | 479 // Fill the background |
481 SkSampler::Fill(dstInfo, dst, dstRowBytes, | 480 SkSampler::Fill(dstInfo, dst, dstRowBytes, |
482 this->getFillValue(dstInfo.colorType(), dstInfo.alphaType()), | 481 this->getFillValue(dstInfo.colorType(), dstInfo.alphaType()), |
483 opts.fZeroInitialized); | 482 opts.fZeroInitialized); |
484 | |
485 // Modify the dst pointer | |
486 const int32_t dstBytesPerPixel = SkColorTypeBytesPerPixel(dstInfo.colorT
ype()); | |
487 dst = SkTAddOffset<void*>(dst, dstRowBytes * fFrameRect.top() + | |
488 dstBytesPerPixel * fFrameRect.left()); | |
489 } else { | |
490 if (kSuccess != this->initializeSwizzler(dstInfo, opts)) { | |
491 return gif_error("Could not initialize swizzler.\n", kUnimplemented)
; | |
492 } | |
493 } | 483 } |
494 | 484 |
495 // Iterate over rows of the input | 485 // Iterate over rows of the input |
496 uint32_t height = fFrameRect.height(); | 486 for (int y = fFrameRect.top(); y < fFrameRect.bottom(); y++) { |
497 for (uint32_t y = 0; y < height; y++) { | |
498 if (!this->readRow()) { | 487 if (!this->readRow()) { |
499 *rowsDecoded = y; | 488 *rowsDecoded = y; |
500 return gif_error("Could not decode line.\n", kIncompleteInput); | 489 return gif_error("Could not decode line.\n", kIncompleteInput); |
501 } | 490 } |
502 void* dstRow = SkTAddOffset<void>(dst, dstRowBytes * this->outputScanlin
e(y)); | 491 void* dstRow = SkTAddOffset<void>(dst, dstRowBytes * this->outputScanlin
e(y)); |
503 fSwizzler->swizzle(dstRow, fSrcBuffer.get()); | 492 fSwizzler->swizzle(dstRow, fSrcBuffer.get()); |
504 } | 493 } |
505 return kSuccess; | 494 return kSuccess; |
506 } | 495 } |
507 | 496 |
508 // FIXME: This is similar to the implementation for bmp and png. Can we share m
ore code or | 497 // FIXME: This is similar to the implementation for bmp and png. Can we share m
ore code or |
509 // possibly make this non-virtual? | 498 // possibly make this non-virtual? |
510 uint32_t SkGifCodec::onGetFillValue(SkColorType colorType, SkAlphaType alphaType
) const { | 499 uint32_t SkGifCodec::onGetFillValue(SkColorType colorType, SkAlphaType alphaType
) const { |
511 const SkPMColor* colorPtr = get_color_ptr(fColorTable.get()); | 500 const SkPMColor* colorPtr = get_color_ptr(fColorTable.get()); |
512 return get_color_table_fill_value(colorType, colorPtr, fFillIndex); | 501 return get_color_table_fill_value(colorType, colorPtr, fFillIndex); |
513 } | 502 } |
514 | 503 |
515 SkCodec::Result SkGifCodec::onStartScanlineDecode(const SkImageInfo& dstInfo, | 504 SkCodec::Result SkGifCodec::onStartScanlineDecode(const SkImageInfo& dstInfo, |
516 const SkCodec::Options& opts, SkPMColor inputColorPtr[], int* inputColor
Count) { | 505 const SkCodec::Options& opts, SkPMColor inputColorPtr[], int* inputColor
Count) { |
517 | 506 return this->prepareToDecode(dstInfo, inputColorPtr, inputColorCount, this->
options()); |
518 Result result = this->prepareToDecode(dstInfo, inputColorPtr, inputColorCoun
t, this->options()); | |
519 if (kSuccess != result) { | |
520 return result; | |
521 } | |
522 | |
523 // Initialize the swizzler | |
524 if (fFrameIsSubset) { | |
525 const SkImageInfo subsetDstInfo = dstInfo.makeWH(fFrameRect.width(), fFr
ameRect.height()); | |
526 if (kSuccess != this->initializeSwizzler(subsetDstInfo, opts)) { | |
527 return gif_error("Could not initialize swizzler.\n", kUnimplemented)
; | |
528 } | |
529 } else { | |
530 if (kSuccess != this->initializeSwizzler(dstInfo, opts)) { | |
531 return gif_error("Could not initialize swizzler.\n", kUnimplemented)
; | |
532 } | |
533 } | |
534 | |
535 return kSuccess; | |
536 } | 507 } |
537 | 508 |
538 int SkGifCodec::onGetScanlines(void* dst, int count, size_t rowBytes) { | 509 int SkGifCodec::onGetScanlines(void* dst, int count, size_t rowBytes) { |
539 int rowsBeforeFrame = 0; | 510 int rowsBeforeFrame = 0; |
540 int rowsAfterFrame = 0; | 511 int rowsAfterFrame = 0; |
541 int rowsInFrame = count; | 512 int rowsInFrame = count; |
542 if (fFrameIsSubset) { | 513 if (fFrameIsSubset) { |
543 // Fill the requested rows | 514 // Fill the requested rows |
544 SkImageInfo fillInfo = this->dstInfo().makeWH(this->dstInfo().width(), c
ount); | 515 SkImageInfo fillInfo = this->dstInfo().makeWH(this->dstInfo().width(), c
ount); |
545 uint32_t fillValue = this->onGetFillValue(this->dstInfo().colorType(), | 516 uint32_t fillValue = this->onGetFillValue(this->dstInfo().colorType(), |
546 this->dstInfo().alphaType()); | 517 this->dstInfo().alphaType()); |
547 SkSampler::Fill(fillInfo, dst, rowBytes, fillValue, this->options().fZer
oInitialized); | 518 fSwizzler->fill(fillInfo, dst, rowBytes, fillValue, this->options().fZer
oInitialized); |
548 | 519 |
549 // Do nothing for rows before the image frame | 520 // Do nothing for rows before the image frame |
550 rowsBeforeFrame = SkTMax(0, fFrameRect.top() - this->INHERITED::nextScan
line()); | 521 rowsBeforeFrame = SkTMax(0, fFrameRect.top() - this->INHERITED::nextScan
line()); |
551 rowsInFrame = SkTMax(0, rowsInFrame - rowsBeforeFrame); | 522 rowsInFrame = SkTMax(0, rowsInFrame - rowsBeforeFrame); |
552 dst = SkTAddOffset<void>(dst, rowBytes * rowsBeforeFrame); | 523 dst = SkTAddOffset<void>(dst, rowBytes * rowsBeforeFrame); |
553 | 524 |
554 // Do nothing for rows after the image frame | 525 // Do nothing for rows after the image frame |
555 rowsAfterFrame = SkTMax(0, | 526 rowsAfterFrame = SkTMax(0, |
556 this->INHERITED::nextScanline() + rowsInFrame - fFrameRect.botto
m()); | 527 this->INHERITED::nextScanline() + rowsInFrame - fFrameRect.botto
m()); |
557 rowsInFrame = SkTMax(0, rowsInFrame - rowsAfterFrame); | 528 rowsInFrame = SkTMax(0, rowsInFrame - rowsAfterFrame); |
558 | |
559 // Adjust dst pointer for left offset | |
560 int offset = SkColorTypeBytesPerPixel(this->dstInfo().colorType()) * fFr
ameRect.left(); | |
561 dst = SkTAddOffset<void>(dst, offset); | |
562 } | 529 } |
563 | 530 |
564 for (int i = 0; i < rowsInFrame; i++) { | 531 for (int i = 0; i < rowsInFrame; i++) { |
565 if (!this->readRow()) { | 532 if (!this->readRow()) { |
566 return i + rowsBeforeFrame; | 533 return i + rowsBeforeFrame; |
567 } | 534 } |
568 fSwizzler->swizzle(dst, fSrcBuffer.get()); | 535 fSwizzler->swizzle(dst, fSrcBuffer.get()); |
569 dst = SkTAddOffset<void>(dst, rowBytes); | 536 dst = SkTAddOffset<void>(dst, rowBytes); |
570 } | 537 } |
571 | 538 |
572 return count; | 539 return count; |
573 } | 540 } |
574 | 541 |
575 SkCodec::SkScanlineOrder SkGifCodec::onGetScanlineOrder() const { | 542 SkCodec::SkScanlineOrder SkGifCodec::onGetScanlineOrder() const { |
576 if (fGif->Image.Interlace) { | 543 if (fGif->Image.Interlace) { |
577 return kOutOfOrder_SkScanlineOrder; | 544 return kOutOfOrder_SkScanlineOrder; |
578 } | 545 } |
579 return kTopDown_SkScanlineOrder; | 546 return kTopDown_SkScanlineOrder; |
580 } | 547 } |
581 | 548 |
582 int SkGifCodec::onOutputScanline(int inputScanline) const { | 549 int SkGifCodec::onOutputScanline(int inputScanline) const { |
583 if (fGif->Image.Interlace) { | 550 if (fGif->Image.Interlace) { |
584 if (inputScanline < fFrameRect.top() || inputScanline >= fFrameRect.bott
om()) { | 551 if (inputScanline < fFrameRect.top() || inputScanline >= fFrameRect.bott
om()) { |
585 return inputScanline; | 552 return inputScanline; |
586 } | 553 } |
587 return get_output_row_interlaced(inputScanline - fFrameRect.top(), fFram
eRect.height()); | 554 return get_output_row_interlaced(inputScanline - fFrameRect.top(), fFram
eRect.height()) + |
| 555 fFrameRect.top(); |
588 } | 556 } |
589 return inputScanline; | 557 return inputScanline; |
590 } | 558 } |
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