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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 "SkPngChunkReader.h" | 10 #include "SkPngChunkReader.h" |
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25 static SkCodec* NewFromStream(SkStream*, SkPngChunkReader* = NULL); | 25 static SkCodec* NewFromStream(SkStream*, SkPngChunkReader* = NULL); |
26 | 26 |
27 virtual ~SkPngCodec(); | 27 virtual ~SkPngCodec(); |
28 | 28 |
29 protected: | 29 protected: |
30 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*, int*) | 30 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*, int*) |
31 override; | 31 override; |
32 SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedF
ormat; } | 32 SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedF
ormat; } |
33 bool onRewind() override; | 33 bool onRewind() override; |
34 uint32_t onGetFillValue(SkColorType colorType, SkAlphaType alphaType) const
override; | 34 uint32_t onGetFillValue(SkColorType colorType, SkAlphaType alphaType) const
override; |
35 bool onReallyHasAlpha() const final; | |
36 | 35 |
37 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. | 36 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. |
38 Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&, | 37 Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&, |
39 SkPMColor*, int* ctableCount); | 38 SkPMColor*, int* ctableCount); |
40 SkSampler* getSampler(bool createIfNecessary) override { | 39 SkSampler* getSampler(bool createIfNecessary) override { |
41 SkASSERT(fSwizzler); | 40 SkASSERT(fSwizzler); |
42 return fSwizzler; | 41 return fSwizzler; |
43 } | 42 } |
44 | 43 |
45 SkPngCodec(const SkImageInfo&, SkStream*, SkPngChunkReader*, png_structp, pn
g_infop, int, int); | 44 SkPngCodec(const SkImageInfo&, SkStream*, SkPngChunkReader*, png_structp, pn
g_infop, int, int); |
46 | 45 |
47 png_structp png_ptr() { return fPng_ptr; } | 46 png_structp png_ptr() { return fPng_ptr; } |
48 SkSwizzler* swizzler() { return fSwizzler; } | 47 SkSwizzler* swizzler() { return fSwizzler; } |
49 SkSwizzler::SrcConfig srcConfig() const { return fSrcConfig; } | 48 SkSwizzler::SrcConfig srcConfig() const { return fSrcConfig; } |
50 int numberPasses() const { return fNumberPasses; } | 49 int numberPasses() const { return fNumberPasses; } |
51 | 50 |
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; | |
64 | |
65 private: | 51 private: |
66 SkAutoTUnref<SkPngChunkReader> fPngChunkReader; | 52 SkAutoTUnref<SkPngChunkReader> fPngChunkReader; |
67 png_structp fPng_ptr; | 53 png_structp fPng_ptr; |
68 png_infop fInfo_ptr; | 54 png_infop fInfo_ptr; |
69 | 55 |
70 // These are stored here so they can be used both by normal decoding and sca
nline decoding. | 56 // These are stored here so they can be used both by normal decoding and sca
nline decoding. |
71 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. | 57 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. |
72 SkAutoTDelete<SkSwizzler> fSwizzler; | 58 SkAutoTDelete<SkSwizzler> fSwizzler; |
73 | 59 |
74 SkSwizzler::SrcConfig fSrcConfig; | 60 SkSwizzler::SrcConfig fSrcConfig; |
75 const int fNumberPasses; | 61 const int fNumberPasses; |
76 int fBitDepth; | 62 int fBitDepth; |
77 AlphaState fAlphaState; | |
78 | 63 |
79 bool decodePalette(bool premultiply, int* ctableCount); | 64 bool decodePalette(bool premultiply, int* ctableCount); |
80 void destroyReadStruct(); | 65 void destroyReadStruct(); |
81 | 66 |
82 typedef SkCodec INHERITED; | 67 typedef SkCodec INHERITED; |
83 }; | 68 }; |
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