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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" |
11 #include "SkImageInfo.h" | 11 #include "SkImageInfo.h" |
12 #include "SkRefCnt.h" | 12 #include "SkRefCnt.h" |
13 #include "SkSwizzler.h" | 13 #include "SkSwizzler.h" |
14 | 14 |
15 #ifdef SKIA_PNG_PREFIXED | 15 #ifdef SKIA_PNG_PREFIXED |
16 // this must proceed png.h | 16 // this must proceed png.h |
17 #include "pngprefix.h" | 17 #include "pngprefix.h" |
18 #endif | 18 #endif |
19 #include "png.h" | 19 #include "png.h" |
20 | 20 |
21 class SkScanlineDecoder; | 21 class SkScanlineDecoder; |
22 class SkStream; | 22 class SkStream; |
23 | 23 |
24 class SkPngCodec : public SkCodec { | 24 class SkPngCodec : public SkCodec { |
25 public: | 25 public: |
26 // Assumes IsPng was called and returned true. | 26 // Assumes IsPng was called and returned true. |
27 static SkCodec* NewFromStream(SkStream*); | 27 static SkCodec* NewFromStream(SkStream*); |
28 static bool IsPng(SkStream*); | 28 static bool IsPng(SkStream*); |
| 29 |
| 30 virtual ~SkPngCodec(); |
| 31 |
29 protected: | 32 protected: |
30 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*) | 33 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*) |
31 override; | 34 override; |
32 SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedF
ormat; } | 35 SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedF
ormat; } |
33 SkScanlineDecoder* onGetScanlineDecoder(const SkImageInfo& dstInfo, const Op
tions& options, | 36 SkScanlineDecoder* onGetScanlineDecoder(const SkImageInfo& dstInfo, const Op
tions& options, |
34 SkPMColor ctable[], int* ctableCount
) override; | 37 SkPMColor ctable[], int* ctableCount
) override; |
35 bool onReallyHasAlpha() const override { return fReallyHasAlpha; } | 38 bool onReallyHasAlpha() const override { return fReallyHasAlpha; } |
36 private: | 39 private: |
37 png_structp fPng_ptr; | 40 png_structp fPng_ptr; |
38 png_infop fInfo_ptr; | 41 png_infop fInfo_ptr; |
39 | 42 |
40 // These are stored here so they can be used both by normal decoding and sca
nline decoding. | 43 // These are stored here so they can be used both by normal decoding and sca
nline decoding. |
41 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. | 44 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. |
42 SkAutoTDelete<SkSwizzler> fSwizzler; | 45 SkAutoTDelete<SkSwizzler> fSwizzler; |
43 | 46 |
44 SkSwizzler::SrcConfig fSrcConfig; | 47 SkSwizzler::SrcConfig fSrcConfig; |
45 int fNumberPasses; | 48 int fNumberPasses; |
46 bool fReallyHasAlpha; | 49 bool fReallyHasAlpha; |
47 int fBitDepth; | 50 int fBitDepth; |
48 | 51 |
49 SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop, int); | 52 SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop, int); |
50 ~SkPngCodec(); | |
51 | 53 |
52 | 54 |
53 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. | 55 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. |
54 Result initializeSwizzler(const SkImageInfo& requestedInfo, void* dst, | 56 Result initializeSwizzler(const SkImageInfo& requestedInfo, void* dst, |
55 size_t rowBytes, const Options&, SkPMColor*, int*
ctableCount); | 57 size_t rowBytes, const Options&, SkPMColor*, int*
ctableCount); |
56 | 58 |
57 // Calls rewindIfNeeded and returns true if the decoder can continue. | 59 // Calls rewindIfNeeded and returns true if the decoder can continue. |
58 bool handleRewind(); | 60 bool handleRewind(); |
59 bool decodePalette(bool premultiply, int bitDepth, int* ctableCount); | 61 bool decodePalette(bool premultiply, int* ctableCount); |
60 void finish(); | 62 void finish(); |
61 void destroyReadStruct(); | 63 void destroyReadStruct(); |
62 | 64 |
63 friend class SkPngScanlineDecoder; | 65 friend class SkPngScanlineDecoder; |
64 friend class SkPngInterlacedScanlineDecoder; | 66 friend class SkPngInterlacedScanlineDecoder; |
65 | 67 |
66 typedef SkCodec INHERITED; | 68 typedef SkCodec INHERITED; |
67 }; | 69 }; |
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