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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 #ifndef SkCodec_DEFINED | 8 #ifndef SkCodec_DEFINED |
9 #define SkCodec_DEFINED | 9 #define SkCodec_DEFINED |
10 | 10 |
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390 * decoder. | 390 * decoder. |
391 * | 391 * |
392 * This will equal fCurrScanline, except in the case of strangely | 392 * This will equal fCurrScanline, except in the case of strangely |
393 * encoded image types (bottom-up bmps, interlaced gifs). | 393 * encoded image types (bottom-up bmps, interlaced gifs). |
394 * | 394 * |
395 * Results are undefined when not in scanline decoding mode. | 395 * Results are undefined when not in scanline decoding mode. |
396 */ | 396 */ |
397 int nextScanline() const { return this->outputScanline(fCurrScanline); } | 397 int nextScanline() const { return this->outputScanline(fCurrScanline); } |
398 | 398 |
399 /** | 399 /** |
400 * Returns the output y-coordinate of the row that corresponds to an input | 400 * Returns the output y-coordinate of the row that corresponds to an input |
401 * y-coordinate. The input y-coordinate represents where the scanline | 401 * y-coordinate. The input y-coordinate represents where the scanline |
402 * is located in the encoded data. | 402 * is located in the encoded data. |
403 * | 403 * |
404 * This will equal inputScanline, except in the case of strangely | 404 * This will equal inputScanline, except in the case of strangely |
405 * encoded image types (bottom-up bmps, interlaced gifs). | 405 * encoded image types (bottom-up bmps, interlaced gifs). |
406 */ | 406 */ |
407 int outputScanline(int inputScanline) const; | 407 int outputScanline(int inputScanline) const; |
408 | 408 |
409 protected: | 409 protected: |
410 SkCodec(const SkImageInfo&, SkStream*); | 410 SkCodec(const SkImageInfo&, SkStream*); |
411 | 411 |
412 virtual SkISize onGetScaledDimensions(float /* desiredScale */) const { | 412 virtual SkISize onGetScaledDimensions(float /* desiredScale */) const { |
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504 /** | 504 /** |
505 * The remaining functions revolve around decoding scanlines. | 505 * The remaining functions revolve around decoding scanlines. |
506 */ | 506 */ |
507 | 507 |
508 /** | 508 /** |
509 * Most images types will be kTopDown and will not need to override this fu
nction. | 509 * Most images types will be kTopDown and will not need to override this fu
nction. |
510 */ | 510 */ |
511 virtual SkScanlineOrder onGetScanlineOrder() const { return kTopDown_SkScanl
ineOrder; } | 511 virtual SkScanlineOrder onGetScanlineOrder() const { return kTopDown_SkScanl
ineOrder; } |
512 | 512 |
513 /** | 513 /** |
514 * Update the next scanline. Used by interlaced png. | 514 * Update the current scanline. Used by interlaced png. |
515 */ | 515 */ |
516 void updateNextScanline(int newY) { fCurrScanline = newY; } | 516 void updateCurrScanline(int newY) { fCurrScanline = newY; } |
517 | 517 |
518 const SkImageInfo& dstInfo() const { return fDstInfo; } | 518 const SkImageInfo& dstInfo() const { return fDstInfo; } |
519 | 519 |
520 const SkCodec::Options& options() const { return fOptions; } | 520 const SkCodec::Options& options() const { return fOptions; } |
521 | 521 |
| 522 /** |
| 523 * Returns the number of scanlines that have been decoded so far. |
| 524 * This is unaffected by the SkScanlineOrder. |
| 525 * |
| 526 * Returns -1 if we have not started a scanline decode. |
| 527 */ |
| 528 int currScanline() const { return fCurrScanline; } |
| 529 |
522 virtual int onOutputScanline(int inputScanline) const; | 530 virtual int onOutputScanline(int inputScanline) const; |
523 | 531 |
524 private: | 532 private: |
525 const SkImageInfo fSrcInfo; | 533 const SkImageInfo fSrcInfo; |
526 SkAutoTDelete<SkStream> fStream; | 534 SkAutoTDelete<SkStream> fStream; |
527 bool fNeedsRewind; | 535 bool fNeedsRewind; |
528 // These fields are only meaningful during scanline decodes. | 536 // These fields are only meaningful during scanline decodes. |
529 SkImageInfo fDstInfo; | 537 SkImageInfo fDstInfo; |
530 SkCodec::Options fOptions; | 538 SkCodec::Options fOptions; |
531 int fCurrScanline; | 539 int fCurrScanline; |
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587 * May create a sampler, if one is not currently being used. Otherwise, doe
s | 595 * May create a sampler, if one is not currently being used. Otherwise, doe
s |
588 * not affect ownership. | 596 * not affect ownership. |
589 * | 597 * |
590 * Only valid during scanline decoding. | 598 * Only valid during scanline decoding. |
591 */ | 599 */ |
592 virtual SkSampler* getSampler(bool /*createIfNecessary*/) { return nullptr;
} | 600 virtual SkSampler* getSampler(bool /*createIfNecessary*/) { return nullptr;
} |
593 | 601 |
594 friend class SkSampledCodec; | 602 friend class SkSampledCodec; |
595 }; | 603 }; |
596 #endif // SkCodec_DEFINED | 604 #endif // SkCodec_DEFINED |
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