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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 "SkEncodedFormat.h" | 10 #include "SkEncodedFormat.h" |
10 #include "SkImageInfo.h" | 11 #include "SkImageInfo.h" |
| 12 #include "SkRefCnt.h" |
| 13 #include "SkSwizzler.h" |
11 | 14 |
12 extern "C" { | 15 extern "C" { |
13 // FIXME: I'd like to force all platforms to use the same decoder, but this | |
14 // means an extra dependency on Mac/Win. | |
15 #include "png.h" | 16 #include "png.h" |
16 } | 17 } |
17 | 18 |
| 19 class SkScanlineDecoder; |
18 class SkStream; | 20 class SkStream; |
19 | 21 |
20 class SkPngCodec : public SkCodec { | 22 class SkPngCodec : public SkCodec { |
21 public: | 23 public: |
22 // Assumes IsPng was called and returned true. | 24 // Assumes IsPng was called and returned true. |
23 static SkCodec* NewFromStream(SkStream*); | 25 static SkCodec* NewFromStream(SkStream*); |
24 static bool IsPng(SkStream*); | 26 static bool IsPng(SkStream*); |
25 protected: | 27 protected: |
26 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*) | 28 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMCo
lor*, int*) |
27 SK_OVERRIDE; | 29 SK_OVERRIDE; |
28 SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE { return kPNG_SkEncod
edFormat; } | 30 SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE { return kPNG_SkEncod
edFormat; } |
| 31 SkScanlineDecoder* onGetScanlineDecoder(const SkImageInfo& dstInfo) SK_OVERR
IDE; |
| 32 bool onReallyHasAlpha() const SK_OVERRIDE { return fReallyHasAlpha; } |
29 private: | 33 private: |
30 png_structp fPng_ptr; | 34 png_structp fPng_ptr; |
31 png_infop fInfo_ptr; | 35 png_infop fInfo_ptr; |
| 36 |
| 37 // These are stored here so they can be used both by normal decoding and sca
nline decoding. |
| 38 SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul. |
| 39 SkAutoTDelete<SkSwizzler> fSwizzler; |
| 40 |
| 41 SkSwizzler::SrcConfig fSrcConfig; |
| 42 int fNumberPasses; |
| 43 bool fReallyHasAlpha; |
32 | 44 |
33 SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop); | 45 SkPngCodec(const SkImageInfo&, SkStream*, png_structp, png_infop); |
34 ~SkPngCodec(); | 46 ~SkPngCodec(); |
35 | 47 |
| 48 // Helper to set up swizzler and color table. Also calls png_read_update_inf
o. |
| 49 Result initializeSwizzler(const SkImageInfo& requestedInfo, void* dst, |
| 50 size_t rowBytes, const Options&); |
| 51 bool decodePalette(bool premultiply); |
| 52 void finish(); |
| 53 |
| 54 friend class SkPngScanlineDecoder; |
| 55 |
36 typedef SkCodec INHERITED; | 56 typedef SkCodec INHERITED; |
37 }; | 57 }; |
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