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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.h" | 8 #include "SkCodec.h" |
9 #include "SkColorTable.h" | 9 #include "SkColorTable.h" |
10 #include "SkEncodedFormat.h" | 10 #include "SkEncodedFormat.h" |
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29 static SkCodec* NewFromStream(SkStream*); | 29 static SkCodec* NewFromStream(SkStream*); |
30 static SkScanlineDecoder* NewSDFromStream(SkStream*); | 30 static SkScanlineDecoder* NewSDFromStream(SkStream*); |
31 | 31 |
32 virtual ~SkPngCodec(); | 32 virtual ~SkPngCodec(); |
33 | 33 |
34 protected: | 34 protected: |
35 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*) | 35 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*) |
36 override; | 36 override; |
37 SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedF
ormat; } | 37 SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedF
ormat; } |
38 bool onRewind() override; | 38 bool onRewind() override; |
39 bool onReallyHasAlpha() const override { return fReallyHasAlpha; } | 39 bool onReallyHasAlpha() const final; |
| 40 |
| 41 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. |
| 42 Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&, |
| 43 SkPMColor*, int* ctableCount); |
| 44 |
| 45 SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop, int, int); |
| 46 |
| 47 png_structp png_ptr() { return fPng_ptr; } |
| 48 SkSwizzler* swizzler() { return fSwizzler; } |
| 49 SkSwizzler::SrcConfig srcConfig() const { return fSrcConfig; } |
| 50 int numberPasses() const { return fNumberPasses; } |
| 51 |
| 52 enum AlphaState { |
| 53 // This class has done no decoding, or threw away its knowledge (in |
| 54 // scanline decodes). |
| 55 kUnknown_AlphaState, |
| 56 // This class found the image (possibly partial, in the case of a |
| 57 // scanline decode) to be opaque. |
| 58 kOpaque_AlphaState, |
| 59 // Ths class found the image to have alpha. |
| 60 kHasAlpha_AlphaState, |
| 61 }; |
| 62 |
| 63 virtual AlphaState alphaInScanlineDecode() const = 0; |
40 | 64 |
41 private: | 65 private: |
42 png_structp fPng_ptr; | 66 png_structp fPng_ptr; |
43 png_infop fInfo_ptr; | 67 png_infop fInfo_ptr; |
44 | 68 |
45 // These are stored here so they can be used both by normal decoding and sca
nline decoding. | 69 // These are stored here so they can be used both by normal decoding and sca
nline decoding. |
46 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. | 70 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. |
47 SkAutoTDelete<SkSwizzler> fSwizzler; | 71 SkAutoTDelete<SkSwizzler> fSwizzler; |
48 | 72 |
49 SkSwizzler::SrcConfig fSrcConfig; | 73 SkSwizzler::SrcConfig fSrcConfig; |
50 int fNumberPasses; | 74 const int fNumberPasses; |
51 bool fReallyHasAlpha; | |
52 int fBitDepth; | 75 int fBitDepth; |
53 | 76 |
54 SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop, int); | 77 AlphaState fAlphaState; |
55 | |
56 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. | |
57 Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&, | |
58 SkPMColor*, int* ctableCount); | |
59 | 78 |
60 bool decodePalette(bool premultiply, int* ctableCount); | 79 bool decodePalette(bool premultiply, int* ctableCount); |
61 void destroyReadStruct(); | 80 void destroyReadStruct(); |
62 | 81 |
63 friend class SkPngScanlineDecoder; | |
64 friend class SkPngInterlacedScanlineDecoder; | |
65 | |
66 typedef SkCodec INHERITED; | 82 typedef SkCodec INHERITED; |
67 }; | 83 }; |
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