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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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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 | 38 |
39 public: | 39 public: |
40 PNGImageDecoder(AlphaOption, | 40 PNGImageDecoder(AlphaOption, |
41 ColorSpaceOption, | 41 ColorSpaceOption, |
42 size_t maxDecodedBytes, | 42 size_t maxDecodedBytes, |
43 size_t offset = 0); | 43 size_t offset = 0); |
44 ~PNGImageDecoder() override; | 44 ~PNGImageDecoder() override; |
45 | 45 |
| 46 enum class PNGParseQuery { PNGSizeQuery, PNGMetaDataQuery }; |
| 47 |
46 // ImageDecoder: | 48 // ImageDecoder: |
47 String filenameExtension() const override { return "png"; } | 49 String filenameExtension() const override { return "png"; } |
| 50 int repetitionCount() const override; |
| 51 bool frameIsCompleteAtIndex(size_t) const override; |
| 52 float frameDurationAtIndex(size_t) const override; |
| 53 size_t clearCacheExceptFrame(size_t) override; |
48 | 54 |
49 // Callbacks from libpng | 55 // Callbacks from libpng |
50 void headerAvailable(); | 56 void headerAvailable(); |
51 void rowAvailable(unsigned char* row, unsigned rowIndex, int); | 57 void rowAvailable(unsigned char* row, unsigned rowIndex, int); |
52 void complete(); | 58 void complete(); |
53 | 59 |
| 60 // Additional methods used for APNG |
| 61 void setRepetitionCount(size_t); |
| 62 |
54 private: | 63 private: |
55 // ImageDecoder: | 64 // ImageDecoder: |
56 void decodeSize() override { decode(true); } | 65 void decodeSize() override { parse(PNGParseQuery::PNGSizeQuery); } |
57 void decode(size_t) override { decode(false); } | 66 void decode(size_t) override; |
| 67 size_t decodeFrameCount() override; |
| 68 void initializeNewFrame(size_t) override; |
| 69 void clearFrameBuffer(size_t) override; |
58 | 70 |
59 // Decodes the image. If |onlySize| is true, stops decoding after | 71 bool initFrameBuffer(size_t); |
60 // calculating the image size. If decoding fails but there is no more | 72 void parse(PNGParseQuery); |
61 // data coming, sets the "decode failure" flag. | 73 // Used by clearCacheExceptFrame if two frames need to be kept in cache. |
62 void decode(bool onlySize); | 74 size_t clearCacheExceptTwoFrames(size_t, size_t); |
63 | 75 |
64 std::unique_ptr<PNGImageReader> m_reader; | 76 std::unique_ptr<PNGImageReader> m_reader; |
65 const unsigned m_offset; | 77 const unsigned m_offset; |
| 78 size_t m_frameCount; |
| 79 size_t m_currentFrame; |
| 80 // m_repetitionCount is set to cAnimationLoopOnce by default, so the |
| 81 // DeferredImageDecoder takes into account that this may be an animated |
| 82 // image, but we don't know for sure yet. |
| 83 int m_repetitionCount; |
66 }; | 84 }; |
67 | 85 |
68 } // namespace blink | 86 } // namespace blink |
69 | 87 |
70 #endif | 88 #endif |
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