third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoder.h - Issue 2930513004: [WIP] Move ImageDecoders to SkCodec

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Issue 2930513004: [WIP] Move ImageDecoders to SkCodec

Patch Set: Adding check for decoder creation Created 3 years, 6 months ago

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1 /*

2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.

3 *

4 * Redistribution and use in source and binary forms, with or without

5 * modification, are permitted provided that the following conditions

6 * are met:

7 * 1. Redistributions of source code must retain the above copyright

8 * notice, this list of conditions and the following disclaimer.

9 * 2. Redistributions in binary form must reproduce the above copyright

10 * notice, this list of conditions and the following disclaimer in the

11 * documentation and/or other materials provided with the distribution.

12 *

13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR

17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

24 */

25

26 #ifndef PNGImageDecoder_h

27 #define PNGImageDecoder_h

28

29 #include <memory>

30 #include "platform/image-decoders/ImageDecoder.h"

31 #include "platform/image-decoders/png/PNGImageReader.h"

32

33 namespace blink {

34

35 class PLATFORM_EXPORT PNGImageDecoder final : public ImageDecoder {

36 WTF_MAKE_NONCOPYABLE(PNGImageDecoder);

37

38 public:

39 PNGImageDecoder(AlphaOption,

40 const ColorBehavior&,

41 size_t max_decoded_bytes,

42 size_t offset = 0);

43 ~PNGImageDecoder() override;

44

45 // ImageDecoder:

46 String FilenameExtension() const override { return "png"; }

47 bool SetSize(unsigned, unsigned) override;

48 int RepetitionCount() const override;

49 bool FrameIsCompleteAtIndex(size_t) const override;

50 float FrameDurationAtIndex(size_t) const override;

51 bool SetFailed() override;

52

53 // Callbacks from libpng

54 void HeaderAvailable();

55 void RowAvailable(unsigned char* row, unsigned row_index, int);

56 void FrameComplete();

57

58 void SetColorSpace();

59 void SetRepetitionCount(int);

60

61 private:

62 using ParseQuery = PNGImageReader::ParseQuery;

63

64 // ImageDecoder:

65 void DecodeSize() override { Parse(ParseQuery::kSize); }

66 void Decode(size_t) override;

67 void Parse(ParseQuery);

68 size_t DecodeFrameCount() override;

69 void InitializeNewFrame(size_t) override;

70 void ClearFrameBuffer(size_t) override;

71 bool CanReusePreviousFrameBuffer(size_t) const override;

72

73 std::unique_ptr<PNGImageReader> reader_;

74 const unsigned offset_;

75 size_t current_frame_;

76 int repetition_count_;

77 bool has_alpha_channel_;

78 bool current_buffer_saw_alpha_;

79 };

80

81 } // namespace blink

82

83 #endif

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