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661dc384 1/////////////////////////////////////////////////////////////////////////////
ce7208d4 2// Name: wx/gifdecod.h
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3// Purpose: wxGIFDecoder, GIF reader for wxImage and wxAnimation
4// Author: Guillermo Rodriguez Garcia <guille@iies.es>
3c87527e 5// Version: 3.02
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6// CVS-ID: $Id$
7// Copyright: (c) 1999 Guillermo Rodriguez Garcia
65571936 8// Licence: wxWindows licence
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9/////////////////////////////////////////////////////////////////////////////
10
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11#ifndef _WX_GIFDECOD_H_
12#define _WX_GIFDECOD_H_
661dc384 13
2ecf902b 14#include "wx/defs.h"
661dc384 15
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16#if wxUSE_STREAMS && wxUSE_GIF
17
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18#include "wx/stream.h"
19#include "wx/image.h"
72045d57 20#include "wx/animdecod.h"
7e0bac9d 21#include "wx/dynarray.h"
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22
23// internal utility used to store a frame in 8bit-per-pixel format
870cf35c 24class GIFImage;
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25
26
e4b8154a 27// --------------------------------------------------------------------------
8141573c 28// Constants
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29// --------------------------------------------------------------------------
30
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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,
870cf35c 35// the stream will not be correctly positioned.
8141573c 36//
72045d57 37enum wxGIFErrorCode
8141573c 38{
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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
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43};
44
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45// --------------------------------------------------------------------------
46// wxGIFDecoder class
47// --------------------------------------------------------------------------
48
72045d57 49class WXDLLEXPORT wxGIFDecoder : public wxAnimationDecoder
661dc384 50{
809e8e44 51public:
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52 // constructor, destructor, etc.
53 wxGIFDecoder();
54 ~wxGIFDecoder();
55
661dc384 56 // get data of current frame
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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;
72045d57 62
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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;
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67
68 // GIFs can contain both static images and animations
69 bool IsAnimation() const
70 { return m_nFrames > 1; }
e4b8154a 71
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72 // load function which returns more info than just Load():
73 wxGIFErrorCode LoadGIF( wxInputStream& stream );
74
75 // free all internal frames
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76 void Destroy();
77
870cf35c 78 // implementation of wxAnimationDecoder's pure virtuals
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79 virtual bool CanRead( wxInputStream& stream ) const;
80 virtual bool Load( wxInputStream& stream )
81 { return LoadGIF(stream) == wxGIF_OK; }
82
870cf35c 83 bool ConvertToImage(unsigned int frame, wxImage *image) const;
22f3361e 84
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85 wxAnimationDecoder *Clone() const
86 { return new wxGIFDecoder; }
87 wxAnimationType GetType() const
88 { return wxANIMATION_TYPE_GIF; }
89
90private:
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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
22f3361e 105 DECLARE_NO_COPY_CLASS(wxGIFDecoder)
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106};
107
b0f76951 108#endif // wxUSE_STREAMS && wxUSE_GIF
661dc384 109
870cf35c 110#endif // _WX_GIFDECOD_H_