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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 |
11 #include "../private/SkTemplates.h" | 11 #include "../private/SkTemplates.h" |
12 #include "SkColor.h" | 12 #include "SkColor.h" |
13 #include "SkColorSpace.h" | |
14 #include "SkEncodedFormat.h" | 13 #include "SkEncodedFormat.h" |
15 #include "SkImageInfo.h" | 14 #include "SkImageInfo.h" |
16 #include "SkSize.h" | 15 #include "SkSize.h" |
17 #include "SkStream.h" | 16 #include "SkStream.h" |
18 #include "SkTypes.h" | 17 #include "SkTypes.h" |
19 | 18 |
| 19 class SkColorSpace; |
20 class SkData; | 20 class SkData; |
21 class SkPngChunkReader; | 21 class SkPngChunkReader; |
22 class SkSampler; | 22 class SkSampler; |
23 | 23 |
24 /** | 24 /** |
25 * Abstraction layer directly on top of an image codec. | 25 * Abstraction layer directly on top of an image codec. |
26 */ | 26 */ |
27 class SkCodec : SkNoncopyable { | 27 class SkCodec : SkNoncopyable { |
28 public: | 28 public: |
29 /** | 29 /** |
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97 /** | 97 /** |
98 * Return the ImageInfo associated with this codec. | 98 * Return the ImageInfo associated with this codec. |
99 */ | 99 */ |
100 const SkImageInfo& getInfo() const { return fSrcInfo; } | 100 const SkImageInfo& getInfo() const { return fSrcInfo; } |
101 | 101 |
102 /** | 102 /** |
103 * Returns the color space associated with the codec. | 103 * Returns the color space associated with the codec. |
104 * Does not affect ownership. | 104 * Does not affect ownership. |
105 * Might be NULL. | 105 * Might be NULL. |
106 */ | 106 */ |
107 SkColorSpace* getColorSpace() const { return fColorSpace; } | 107 SkColorSpace* getColorSpace() const { return fColorSpace.get(); } |
108 | 108 |
109 /** | 109 /** |
110 * Return a size that approximately supports the desired scale factor. | 110 * Return a size that approximately supports the desired scale factor. |
111 * The codec may not be able to scale efficiently to the exact scale | 111 * The codec may not be able to scale efficiently to the exact scale |
112 * factor requested, so return a size that approximates that scale. | 112 * factor requested, so return a size that approximates that scale. |
113 * The returned value is the codec's suggestion for the closest valid | 113 * The returned value is the codec's suggestion for the closest valid |
114 * scale that it can natively support | 114 * scale that it can natively support |
115 */ | 115 */ |
116 SkISize getScaledDimensions(float desiredScale) const { | 116 SkISize getScaledDimensions(float desiredScale) const { |
117 // Negative and zero scales are errors. | 117 // Negative and zero scales are errors. |
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507 * This will equal inputScanline, except in the case of strangely | 507 * This will equal inputScanline, except in the case of strangely |
508 * encoded image types (bottom-up bmps, interlaced gifs). | 508 * encoded image types (bottom-up bmps, interlaced gifs). |
509 */ | 509 */ |
510 int outputScanline(int inputScanline) const; | 510 int outputScanline(int inputScanline) const; |
511 | 511 |
512 protected: | 512 protected: |
513 /** | 513 /** |
514 * Takes ownership of SkStream* | 514 * Takes ownership of SkStream* |
515 * Does not affect ownership of SkColorSpace* | 515 * Does not affect ownership of SkColorSpace* |
516 */ | 516 */ |
517 SkCodec(const SkImageInfo&, SkStream*, SkColorSpace* = nullptr); | 517 SkCodec(const SkImageInfo&, SkStream*, sk_sp<SkColorSpace> = nullptr); |
518 | 518 |
519 virtual SkISize onGetScaledDimensions(float /*desiredScale*/) const { | 519 virtual SkISize onGetScaledDimensions(float /*desiredScale*/) const { |
520 // By default, scaling is not supported. | 520 // By default, scaling is not supported. |
521 return this->getInfo().dimensions(); | 521 return this->getInfo().dimensions(); |
522 } | 522 } |
523 | 523 |
524 // FIXME: What to do about subsets?? | 524 // FIXME: What to do about subsets?? |
525 /** | 525 /** |
526 * Subclasses should override if they support dimensions other than the | 526 * Subclasses should override if they support dimensions other than the |
527 * srcInfo's. | 527 * srcInfo's. |
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638 * Returns -1 if we have not started a scanline decode. | 638 * Returns -1 if we have not started a scanline decode. |
639 */ | 639 */ |
640 int currScanline() const { return fCurrScanline; } | 640 int currScanline() const { return fCurrScanline; } |
641 | 641 |
642 virtual int onOutputScanline(int inputScanline) const; | 642 virtual int onOutputScanline(int inputScanline) const; |
643 | 643 |
644 private: | 644 private: |
645 const SkImageInfo fSrcInfo; | 645 const SkImageInfo fSrcInfo; |
646 SkAutoTDelete<SkStream> fStream; | 646 SkAutoTDelete<SkStream> fStream; |
647 bool fNeedsRewind; | 647 bool fNeedsRewind; |
648 SkAutoTUnref<SkColorSpace> fColorSpace; | 648 sk_sp<SkColorSpace> fColorSpace; |
649 | 649 |
650 // These fields are only meaningful during scanline decodes. | 650 // These fields are only meaningful during scanline decodes. |
651 SkImageInfo fDstInfo; | 651 SkImageInfo fDstInfo; |
652 SkCodec::Options fOptions; | 652 SkCodec::Options fOptions; |
653 int fCurrScanline; | 653 int fCurrScanline; |
654 | 654 |
655 /** | 655 /** |
656 * Return whether these dimensions are supported as a scale. | 656 * Return whether these dimensions are supported as a scale. |
657 * | 657 * |
658 * The codec may choose to cache the information about scale and subset. | 658 * The codec may choose to cache the information about scale and subset. |
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699 * not affect ownership. | 699 * not affect ownership. |
700 * | 700 * |
701 * Only valid during scanline decoding. | 701 * Only valid during scanline decoding. |
702 */ | 702 */ |
703 virtual SkSampler* getSampler(bool /*createIfNecessary*/) { return nullptr;
} | 703 virtual SkSampler* getSampler(bool /*createIfNecessary*/) { return nullptr;
} |
704 | 704 |
705 friend class SkSampledCodec; | 705 friend class SkSampledCodec; |
706 friend class SkIcoCodec; | 706 friend class SkIcoCodec; |
707 }; | 707 }; |
708 #endif // SkCodec_DEFINED | 708 #endif // SkCodec_DEFINED |
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