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1 /* | 1 /* |
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. | 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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32 namespace blink { | 32 namespace blink { |
33 | 33 |
34 class PNGImageReader; | 34 class PNGImageReader; |
35 | 35 |
36 class PLATFORM_EXPORT PNGImageDecoder final : public ImageDecoder { | 36 class PLATFORM_EXPORT PNGImageDecoder final : public ImageDecoder { |
37 WTF_MAKE_NONCOPYABLE(PNGImageDecoder); | 37 WTF_MAKE_NONCOPYABLE(PNGImageDecoder); |
38 public: | 38 public: |
39 PNGImageDecoder(AlphaOption, GammaAndColorProfileOption, size_t maxDecodedBy
tes, size_t offset = 0); | 39 PNGImageDecoder(AlphaOption, GammaAndColorProfileOption, size_t maxDecodedBy
tes, size_t offset = 0); |
40 ~PNGImageDecoder() override; | 40 ~PNGImageDecoder() override; |
41 | 41 |
| 42 enum class PNGParseQuery { PNGSizeQuery, PNGMetaDataQuery }; |
| 43 |
42 // ImageDecoder: | 44 // ImageDecoder: |
43 String filenameExtension() const override { return "png"; } | 45 String filenameExtension() const override { return "png"; } |
| 46 int repetitionCount() const override; |
| 47 bool frameIsCompleteAtIndex(size_t) const override; |
| 48 float frameDurationAtIndex(size_t) const override; |
44 | 49 |
45 // Callbacks from libpng | 50 // Callbacks from libpng |
46 void headerAvailable(); | 51 void headerAvailable(); |
47 void rowAvailable(unsigned char* row, unsigned rowIndex, int); | 52 void rowAvailable(unsigned char* row, unsigned rowIndex, int); |
48 void complete(); | 53 void complete(); |
49 | 54 |
| 55 // Additional methods used for APNG |
| 56 void setRepetitionCount(size_t); |
| 57 // This is called by PNGImageReader when it encounters the IEND chunk |
| 58 // while parsing PNGMetaDataQuery. If m_metaDataDecoded is true, the decoder |
| 59 // does not need to query for meta data again. |
| 60 void setMetaDataDecoded() { m_metaDataDecoded = true; }; |
| 61 |
50 private: | 62 private: |
51 // ImageDecoder: | 63 // ImageDecoder: |
52 void decodeSize() override { decode(true); } | 64 void decodeSize() override { parse(PNGParseQuery::PNGSizeQuery); } |
53 void decode(size_t) override { decode(false); } | 65 void decode(size_t) override; |
| 66 size_t decodeFrameCount() override; |
| 67 void initializeNewFrame(size_t) override; |
54 | 68 |
55 // Decodes the image. If |onlySize| is true, stops decoding after | 69 void parse(PNGParseQuery); |
56 // calculating the image size. If decoding fails but there is no more | |
57 // data coming, sets the "decode failure" flag. | |
58 void decode(bool onlySize); | |
59 | 70 |
60 std::unique_ptr<PNGImageReader> m_reader; | 71 std::unique_ptr<PNGImageReader> m_reader; |
61 const unsigned m_offset; | 72 const unsigned m_offset; |
| 73 bool m_metaDataDecoded; |
| 74 size_t m_frameCount; |
| 75 size_t m_currentFrame; |
| 76 // m_repetitionCount is set to cAnimationLoopOnce by default, so the |
| 77 // DeferredImageDecoder takes into account that this may be an animated |
| 78 // image, but we don't know for sure yet. |
| 79 int m_repetitionCount; |
62 }; | 80 }; |
63 | 81 |
64 } // namespace blink | 82 } // namespace blink |
65 | 83 |
66 #endif | 84 #endif |
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