Source/core/platform/image-decoders/gif/GIFImageDecoder.h - Issue 99103006: Moving GraphicsContext and dependencies from core to platform.

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Issue 99103006: Moving GraphicsContext and dependencies from core to platform. (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Final patch - fixes Android Created 7 years 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 GIFImageDecoder_h

27 #define GIFImageDecoder_h

28

29 #include "core/platform/image-decoders/ImageDecoder.h"

30 #include "wtf/OwnPtr.h"

31

32 class GIFImageReader;

33

34 typedef Vector<unsigned char> GIFRow;

35

36 namespace WebCore {

37

38 // This class decodes the GIF image format.

39 class GIFImageDecoder : public ImageDecoder {

40 public:

41 GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProf ileOption, size_t maxDecodedBytes);

42 virtual ~GIFImageDecoder();

43

44 enum GIFParseQuery { GIFSizeQuery, GIFFrameCountQuery };

45

46 // ImageDecoder

47 virtual String filenameExtension() const OVERRIDE { return "gif"; }

48 virtual void setData(SharedBuffer* data, bool allDataReceived) OVERRIDE;

49 virtual bool isSizeAvailable() OVERRIDE;

50 virtual size_t frameCount() OVERRIDE;

51 virtual int repetitionCount() const OVERRIDE;

52 virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE;

53 virtual bool frameIsCompleteAtIndex(size_t) const OVERRIDE;

54 virtual float frameDurationAtIndex(size_t) const OVERRIDE;

55 virtual size_t clearCacheExceptFrame(size_t) OVERRIDE;

56 // CAUTION: setFailed() deletes \|m_reader\|. Be careful to avoid

57 // accessing deleted memory, especially when calling this from inside

58 // GIFImageReader!

59 virtual bool setFailed() OVERRIDE;

60

61 // Callbacks from the GIF reader.

62 bool haveDecodedRow(size_t frameIndex, GIFRow::const_iterator rowBegin, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTransparentPixel s);

63 bool frameComplete(size_t frameIndex);

64

65 // For testing.

66 bool parseCompleted() const;

67

68 private:

69 virtual void clearFrameBuffer(size_t frameIndex) OVERRIDE;

70

71 // Parses as much as is needed to answer the query, ignoring bitmap

72 // data. If parsing fails, sets the "decode failure" flag.

73 void parse(GIFParseQuery);

74

75 // Decodes bitmap data of the frame. Depending on the disposal method

76 // of prior frames, also decodes all required prior frames. If decoding

77 // fails, sets the "decode failure" flag.

78 void decode(size_t frameIndex);

79

80 // Called to initialize the frame buffer with the given index, based on

81 // the previous frame's disposal method. Returns true on success. On

82 // failure, this will mark the image as failed.

83 bool initFrameBuffer(size_t frameIndex);

84

85 bool m_currentBufferSawAlpha;

86 mutable int m_repetitionCount;

87 OwnPtr<GIFImageReader> m_reader;

88 };

89

90 } // namespace WebCore

91

92 #endif

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