projects / wxWidgets.git / blame
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| 661dc384 JS |
1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: gifdecod.h | |
| 3 | // Purpose: wxGIFDecoder, GIF reader for wxImage and wxAnimation | |
| 4 | // Author: Guillermo Rodriguez Garcia <guille@iies.es> | |
| 3c87527e GRG |
5 | // Version: 3.02 |
| 6 | // Last rev: 1999/08/18 | |
| 661dc384 JS |
7 | // Copyright: (c) Guillermo Rodriguez Garcia |
| 8 | // Licence: wxWindows licence | |
| 9 | ///////////////////////////////////////////////////////////////////////////// | |
| 10 | ||
| 11 | #ifndef _WX_GIFDECOD_H | |
| 12 | #define _WX_GIFDECOD_H | |
| 13 | ||
| 14 | #ifdef __GNUG__ | |
| 15 | #pragma interface "gifdecod.h" | |
| 16 | #endif | |
| 17 | ||
| 18 | #include "wx/setup.h" | |
| 19 | ||
| 20 | #if wxUSE_STREAMS | |
| 21 | #include "wx/stream.h" | |
| 22 | #include "wx/image.h" | |
| 23 | ||
| 24 | ||
| 25 | typedef struct _IMAGEN | |
| 26 | { | |
| 27 | unsigned int w; /* width */ | |
| 28 | unsigned int h; /* height */ | |
| 29 | unsigned int left; /* x coord (in logical screen) */ | |
| 30 | unsigned int top; /* y coord (in logical screen) */ | |
| 31 | int transparent; /* transparent color (-1 = none) */ | |
| 3c87527e | 32 | int disposal; /* disposal method (-1 = unspecified) */ |
| 661dc384 JS |
33 | long delay; /* delay in ms (-1 = unused) */ |
| 34 | unsigned char *p; /* bitmap */ | |
| 35 | unsigned char *pal; /* palette */ | |
| 36 | struct _IMAGEN *next; /* next image */ | |
| 37 | struct _IMAGEN *prev; /* prev image */ | |
| 38 | } IMAGEN; | |
| 39 | ||
| 40 | ||
| 41 | /* disposal method */ | |
| 42 | #define D_UNSPECIFIED -1 /* not specified */ | |
| 43 | #define D_DONOTDISPOSE 0 /* do not dispose */ | |
| 44 | #define D_TOBACKGROUND 1 /* restore to background colour */ | |
| 45 | #define D_TOPREVIOUS 2 /* restore to previous image */ | |
| 46 | ||
| 47 | /* error codes */ | |
| 48 | #define E_OK 0 /* everything was OK */ | |
| 49 | #define E_ARCHIVO -1 /* error opening file */ | |
| 50 | #define E_FORMATO -2 /* error in gif header */ | |
| 51 | #define E_MEMORIA -3 /* error allocating memory */ | |
| 52 | ||
| 53 | ||
| 54 | class wxGIFDecoder | |
| 55 | { | |
| 56 | private: | |
| 57 | /* logical screen */ | |
| 58 | unsigned int m_screenw; /* logical screen width */ | |
| 59 | unsigned int m_screenh; /* logical screen height */ | |
| 60 | int m_background; /* background color (-1 = none) */ | |
| 61 | ||
| 62 | /* image data */ | |
| 63 | bool m_anim; /* animated GIF */ | |
| 64 | int m_nimages; /* number of images */ | |
| 65 | int m_image; /* current image */ | |
| 66 | IMAGEN *m_pimage; /* pointer to current image */ | |
| 67 | IMAGEN *m_pfirst; /* pointer to first image */ | |
| 68 | IMAGEN *m_plast; /* pointer to last image */ | |
| 69 | ||
| 70 | /* decoder state vars */ | |
| 71 | int m_restbits; /* remaining valid bits */ | |
| 72 | unsigned int m_restbyte; /* remaining bytes in this block */ | |
| 73 | unsigned int m_lastbyte; /* last byte read */ | |
| 74 | ||
| 75 | wxInputStream *m_f; /* input file */ | |
| 76 | ||
| 77 | private: | |
| 78 | int getcode(int bits, int abfin); | |
| 79 | int dgif(IMAGEN *img, int interl, int bits); | |
| 80 | ||
| 81 | public: | |
| 82 | // constructor, destructor, etc. | |
| 83 | wxGIFDecoder(wxInputStream *s, bool anim = FALSE); | |
| 84 | ~wxGIFDecoder(); | |
| 3c87527e | 85 | bool CanRead(); |
| 661dc384 JS |
86 | int ReadGIF(); |
| 87 | void Destroy(); | |
| 88 | ||
| 89 | // convert current frame to wxImage | |
| 90 | bool ConvertToImage(wxImage *image) const; | |
| 91 | ||
| 92 | // get data of current frame | |
| 93 | int GetFrameIndex() const; | |
| 94 | unsigned char* GetData() const; | |
| 95 | unsigned char* GetPalette() const; | |
| 96 | unsigned int GetWidth() const; | |
| 97 | unsigned int GetHeight() const; | |
| 98 | unsigned int GetLeft() const; | |
| 99 | unsigned int GetTop() const; | |
| 100 | int GetDisposalMethod() const; | |
| 101 | int GetTransparentColour() const; | |
| 102 | long GetDelay() const; | |
| 103 | ||
| 104 | // get global data | |
| 105 | unsigned int GetLogicalScreenWidth() const; | |
| 106 | unsigned int GetLogicalScreenHeight() const; | |
| 107 | int GetBackgroundColour() const; | |
| 108 | int GetNumberOfFrames() const; | |
| 109 | bool IsAnimation() const; | |
| 110 | ||
| 111 | // move through the animation | |
| 112 | bool GoFirstFrame(); | |
| 113 | bool GoLastFrame(); | |
| 114 | bool GoNextFrame(bool cyclic = FALSE); | |
| 115 | bool GoPrevFrame(bool cyclic = FALSE); | |
| 116 | bool GoFrame(int which); | |
| 117 | }; | |
| 118 | ||
| 119 | ||
| 120 | #endif // wxUSE_STREAM | |
| 121 | #endif // _WX_GIFDECOD_H | |
| 122 |