| | 1 | ///////////////////////////////////////////////////////////////////////////// |
| | 2 | // Name: wx/gifdecod.h |
| | 3 | // Purpose: wxGIFDecoder, GIF reader for wxImage and wxAnimation |
| | 4 | // Author: Guillermo Rodriguez Garcia <guille@iies.es> |
| | 5 | // Version: 3.02 |
| | 6 | // CVS-ID: $Id$ |
| | 7 | // Copyright: (c) 1999 Guillermo Rodriguez Garcia |
| | 8 | // Licence: wxWindows licence |
| | 9 | ///////////////////////////////////////////////////////////////////////////// |
| | 10 | |
| | 11 | #ifndef _WX_GIFDECOD_H_ |
| | 12 | #define _WX_GIFDECOD_H_ |
| | 13 | |
| | 14 | #include "wx/defs.h" |
| | 15 | |
| | 16 | #if wxUSE_STREAMS && wxUSE_GIF |
| | 17 | |
| | 18 | #include "wx/stream.h" |
| | 19 | #include "wx/image.h" |
| | 20 | #include "wx/animdecod.h" |
| | 21 | #include "wx/dynarray.h" |
| | 22 | |
| | 23 | // internal utility used to store a frame in 8bit-per-pixel format |
| | 24 | class GIFImage; |
| | 25 | |
| | 26 | |
| | 27 | // -------------------------------------------------------------------------- |
| | 28 | // Constants |
| | 29 | // -------------------------------------------------------------------------- |
| | 30 | |
| | 31 | // Error codes: |
| | 32 | // Note that the error code wxGIF_TRUNCATED means that the image itself |
| | 33 | // is most probably OK, but the decoder didn't reach the end of the data |
| | 34 | // stream; this means that if it was not reading directly from file, |
| | 35 | // the stream will not be correctly positioned. |
| | 36 | // |
| | 37 | enum wxGIFErrorCode |
| | 38 | { |
| | 39 | wxGIF_OK = 0, // everything was OK |
| | 40 | wxGIF_INVFORMAT, // error in GIF header |
| | 41 | wxGIF_MEMERR, // error allocating memory |
| | 42 | wxGIF_TRUNCATED // file appears to be truncated |
| | 43 | }; |
| | 44 | |
| | 45 | // -------------------------------------------------------------------------- |
| | 46 | // wxGIFDecoder class |
| | 47 | // -------------------------------------------------------------------------- |
| | 48 | |
| | 49 | class WXDLLEXPORT wxGIFDecoder : public wxAnimationDecoder |
| | 50 | { |
| | 51 | public: |
| | 52 | // constructor, destructor, etc. |
| | 53 | wxGIFDecoder(); |
| | 54 | ~wxGIFDecoder(); |
| | 55 | |
| | 56 | // get data of current frame |
| | 57 | unsigned char* GetData(unsigned int frame) const; |
| | 58 | unsigned char* GetPalette(unsigned int frame) const; |
| | 59 | unsigned int GetNcolours(unsigned int frame) const; |
| | 60 | int GetTransparentColourIndex(unsigned int frame) const; |
| | 61 | wxColour GetTransparentColour(unsigned int frame) const; |
| | 62 | |
| | 63 | virtual wxSize GetFrameSize(unsigned int frame) const; |
| | 64 | virtual wxPoint GetFramePosition(unsigned int frame) const; |
| | 65 | virtual wxAnimationDisposal GetDisposalMethod(unsigned int frame) const; |
| | 66 | virtual long GetDelay(unsigned int frame) const; |
| | 67 | |
| | 68 | // GIFs can contain both static images and animations |
| | 69 | bool IsAnimation() const |
| | 70 | { return m_nFrames > 1; } |
| | 71 | |
| | 72 | // load function which returns more info than just Load(): |
| | 73 | wxGIFErrorCode LoadGIF( wxInputStream& stream ); |
| | 74 | |
| | 75 | // free all internal frames |
| | 76 | void Destroy(); |
| | 77 | |
| | 78 | // implementation of wxAnimationDecoder's pure virtuals |
| | 79 | virtual bool CanRead( wxInputStream& stream ) const; |
| | 80 | virtual bool Load( wxInputStream& stream ) |
| | 81 | { return LoadGIF(stream) == wxGIF_OK; } |
| | 82 | |
| | 83 | bool ConvertToImage(unsigned int frame, wxImage *image) const; |
| | 84 | |
| | 85 | wxAnimationDecoder *Clone() const |
| | 86 | { return new wxGIFDecoder; } |
| | 87 | wxAnimationType GetType() const |
| | 88 | { return wxANIMATION_TYPE_GIF; } |
| | 89 | |
| | 90 | private: |
| | 91 | // array of all frames |
| | 92 | wxArrayPtrVoid m_frames; |
| | 93 | |
| | 94 | // decoder state vars |
| | 95 | int m_restbits; // remaining valid bits |
| | 96 | unsigned int m_restbyte; // remaining bytes in this block |
| | 97 | unsigned int m_lastbyte; // last byte read |
| | 98 | unsigned char m_buffer[256]; // buffer for reading |
| | 99 | unsigned char *m_bufp; // pointer to next byte in buffer |
| | 100 | |
| | 101 | int getcode(wxInputStream& stream, int bits, int abfin); |
| | 102 | wxGIFErrorCode dgif(wxInputStream& stream, |
| | 103 | GIFImage *img, int interl, int bits); |
| | 104 | |
| | 105 | DECLARE_NO_COPY_CLASS(wxGIFDecoder) |
| | 106 | }; |
| | 107 | |
| | 108 | #endif // wxUSE_STREAMS && wxUSE_GIF |
| | 109 | |
| | 110 | #endif // _WX_GIFDECOD_H_ |
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