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1/////////////////////////////////////////////////////////////////////////////
2// Name: wx/imaggif.h
3// Purpose: wxImage GIF handler
4// Author: Vaclav Slavik, Guillermo Rodriguez Garcia, Gershon Elber, Troels K
5// RCS-ID: $Id$
6// Copyright: (c) 1999-2011 Vaclav Slavik, Guillermo Rodriguez Garcia, Gershon Elber, Troels K
7// Licence: wxWindows licence
8/////////////////////////////////////////////////////////////////////////////
9
10#ifndef _WX_IMAGGIF_H_
11#define _WX_IMAGGIF_H_
12
13#include "wx/image.h"
14
15
16//-----------------------------------------------------------------------------
17// wxGIFHandler
18//-----------------------------------------------------------------------------
19
20#if wxUSE_GIF
21
22#define wxIMAGE_OPTION_GIF_COMMENT wxT("GifComment")
23
24struct wxRGB;
25struct GifHashTableType;
26class WXDLLIMPEXP_FWD_CORE wxImageArray; // anidecod.h
27
28class WXDLLIMPEXP_CORE wxGIFHandler : public wxImageHandler
29{
30public:
31 inline wxGIFHandler()
32 {
33 m_name = wxT("GIF file");
34 m_extension = wxT("gif");
35 m_type = wxBITMAP_TYPE_GIF;
36 m_mime = wxT("image/gif");
37 m_hashTable = NULL;
38 }
39
40#if wxUSE_STREAMS
41 virtual bool LoadFile(wxImage *image, wxInputStream& stream,
42 bool verbose = true, int index = -1);
43 virtual bool SaveFile(wxImage *image, wxOutputStream& stream,
44 bool verbose=true);
45
46 // Save animated gif
47 bool SaveAnimation(const wxImageArray& images, wxOutputStream *stream,
48 bool verbose = true, int delayMilliSecs = 1000);
49
50protected:
51 virtual int DoGetImageCount(wxInputStream& stream);
52 virtual bool DoCanRead(wxInputStream& stream);
53
54 bool DoSaveFile(const wxImage&, wxOutputStream *, bool verbose,
55 bool first, int delayMilliSecs, bool loop,
56 const wxRGB *pal, int palCount,
57 int mask_index);
58#endif // wxUSE_STREAMS
59protected:
60
61 // Declarations for saving
62
63 unsigned long m_crntShiftDWord; /* For bytes decomposition into codes. */
64 int m_pixelCount;
65 struct GifHashTableType *m_hashTable;
66 wxInt16
67 m_EOFCode, /* The EOF LZ code. */
68 m_clearCode, /* The CLEAR LZ code. */
69 m_runningCode, /* The next code algorithm can generate. */
70 m_runningBits, /* The number of bits required to represent RunningCode. */
71 m_maxCode1, /* 1 bigger than max. possible code, in RunningBits bits. */
72 m_crntCode, /* Current algorithm code. */
73 m_crntShiftState; /* Number of bits in CrntShiftDWord. */
74 wxUint8 m_LZBuf[256]; /* Compressed input is buffered here. */
75
76 bool InitHashTable();
77 void ClearHashTable();
78 void InsertHashTable(unsigned long key, int code);
79 int ExistsHashTable(unsigned long key);
80
81#if wxUSE_STREAMS
82 bool CompressOutput(wxOutputStream *, int code);
83 bool SetupCompress(wxOutputStream *, int bpp);
84 bool CompressLine(wxOutputStream *, const wxUint8 *line, int lineLen);
85#endif
86
87private:
88 DECLARE_DYNAMIC_CLASS(wxGIFHandler)
89};
90
91#endif // wxUSE_GIF
92
93#endif // _WX_IMAGGIF_H_
94