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gif_lib.h
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/****************************************************************************** * In order to make life a little bit easier when using the GIF file format, * this library was written, and which does all the dirty work... * * Written by Gershon Elber, Jun. 1989 * Hacks by Eric S. Raymond, Sep. 1992 ****************************************************************************** * History: * 14 Jun 89 - Version 1.0 by Gershon Elber. * 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names) * 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to suoport GIF slurp) * 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support) * 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code) *****************************************************************************/ #ifndef _GIF_LIB_H_ #define _GIF_LIB_H_ 1 #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ #define GIF_LIB_VERSION " Version 4.1, " #define GIF_ERROR 0 #define GIF_OK 1 #ifndef TRUE #define TRUE 1 #endif /* TRUE */ #ifndef FALSE #define FALSE 0 #endif /* FALSE */ #ifndef NULL #define NULL 0 #endif /* NULL */ #define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */ #define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1 #define GIF_VERSION_POS 3 /* Version first character in stamp. */ #define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */ #define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */ #define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */ typedef int GifBooleanType; typedef unsigned char GifPixelType; typedef unsigned char *GifRowType; typedef unsigned char GifByteType; #ifdef _GBA_OPTMEM typedef unsigned short GifPrefixType; typedef short GifWord; #else typedef unsigned int GifPrefixType; typedef int GifWord; #endif #define GIF_MESSAGE(Msg) fprintf(stderr, "\n%s: %s\n", PROGRAM_NAME, Msg) #define GIF_EXIT(Msg) { GIF_MESSAGE(Msg); exit(-3); } #ifdef SYSV #define VoidPtr char * #else #define VoidPtr void * #endif /* SYSV */ typedef struct GifColorType { GifByteType Red, Green, Blue; } GifColorType; typedef struct ColorMapObject { int ColorCount; int BitsPerPixel; GifColorType *Colors; /* on malloc(3) heap */ } ColorMapObject; typedef struct GifImageDesc { GifWord Left, Top, Width, Height, /* Current image dimensions. */ Interlace; /* Sequential/Interlaced lines. */ ColorMapObject *ColorMap; /* The local color map */ } GifImageDesc; typedef struct GifFileType { GifWord SWidth, SHeight, /* Screen dimensions. */ SColorResolution, /* How many colors can we generate? */ SBackGroundColor; /* I hope you understand this one... */ ColorMapObject *SColorMap; /* NULL if not exists. */ int ImageCount; /* Number of current image */ GifImageDesc Image; /* Block describing current image */ struct SavedImage *SavedImages; /* Use this to accumulate file state */ VoidPtr UserData; /* hook to attach user data (TVT) */ VoidPtr Private; /* Don't mess with this! */ } GifFileType; typedef enum { UNDEFINED_RECORD_TYPE, SCREEN_DESC_RECORD_TYPE, IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */ EXTENSION_RECORD_TYPE, /* Begin with '!' */ TERMINATE_RECORD_TYPE /* Begin with ';' */ } GifRecordType; /* DumpScreen2Gif routine constants identify type of window/screen to dump. * Note all values below 1000 are reserved for the IBMPC different display * devices (it has many!) and are compatible with the numbering TC2.0 * (Turbo C 2.0 compiler for IBM PC) gives to these devices. */ typedef enum { GIF_DUMP_SGI_WINDOW = 1000, GIF_DUMP_X_WINDOW = 1001 } GifScreenDumpType; /* func type to read gif data from arbitrary sources (TVT) */ typedef int (*InputFunc) (GifFileType *, GifByteType *, int); /* func type to write gif data ro arbitrary targets. * Returns count of bytes written. (MRB) */ typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int); /****************************************************************************** * GIF89 extension function codes ******************************************************************************/ #define COMMENT_EXT_FUNC_CODE 0xfe /* comment */ #define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */ #define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */ #define APPLICATION_EXT_FUNC_CODE 0xff /* application block */ /****************************************************************************** * O.K., here are the routines one can access in order to encode GIF file: * (GIF_LIB file EGIF_LIB.C). ******************************************************************************/ GifFileType *EGifOpenFileName(const char *GifFileName, int GifTestExistance); GifFileType *EGifOpenFileHandle(int GifFileHandle); GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc); int EGifSpew(GifFileType * GifFile); void EGifSetGifVersion(const char *Version); int EGifPutScreenDesc(GifFileType * GifFile, int GifWidth, int GifHeight, int GifColorRes, int GifBackGround, const ColorMapObject * GifColorMap); int EGifPutImageDesc(GifFileType * GifFile, int GifLeft, int GifTop, int Width, int GifHeight, int GifInterlace, const ColorMapObject * GifColorMap); int EGifPutLine(GifFileType * GifFile, GifPixelType * GifLine, int GifLineLen); int EGifPutPixel(GifFileType * GifFile, GifPixelType GifPixel); int EGifPutComment(GifFileType * GifFile, const char *GifComment); int EGifPutExtensionFirst(GifFileType * GifFile, int GifExtCode, int GifExtLen, const VoidPtr GifExtension); int EGifPutExtensionNext(GifFileType * GifFile, int GifExtCode, int GifExtLen, const VoidPtr GifExtension); int EGifPutExtensionLast(GifFileType * GifFile, int GifExtCode, int GifExtLen, const VoidPtr GifExtension); int EGifPutExtension(GifFileType * GifFile, int GifExtCode, int GifExtLen, const VoidPtr GifExtension); int EGifPutCode(GifFileType * GifFile, int GifCodeSize, const GifByteType * GifCodeBlock); int EGifPutCodeNext(GifFileType * GifFile, const GifByteType * GifCodeBlock); int EGifCloseFile(GifFileType * GifFile); #define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */ #define E_GIF_ERR_WRITE_FAILED 2 #define E_GIF_ERR_HAS_SCRN_DSCR 3 #define E_GIF_ERR_HAS_IMAG_DSCR 4 #define E_GIF_ERR_NO_COLOR_MAP 5 #define E_GIF_ERR_DATA_TOO_BIG 6 #define E_GIF_ERR_NOT_ENOUGH_MEM 7 #define E_GIF_ERR_DISK_IS_FULL 8 #define E_GIF_ERR_CLOSE_FAILED 9 #define E_GIF_ERR_NOT_WRITEABLE 10 /****************************************************************************** * O.K., here are the routines one can access in order to decode GIF file: * (GIF_LIB file DGIF_LIB.C). *****************************************************************************/ #ifndef _GBA_NO_FILEIO GifFileType *DGifOpenFileName(const char *GifFileName); GifFileType *DGifOpenFileHandle(int GifFileHandle); int DGifSlurp(GifFileType * GifFile); #endif /* _GBA_NO_FILEIO */ GifFileType *DGifOpen(void *userPtr, InputFunc readFunc); /* new one * (TVT) */ int DGifGetScreenDesc(GifFileType * GifFile); int DGifGetRecordType(GifFileType * GifFile, GifRecordType * GifType); int DGifGetImageDesc(GifFileType * GifFile); int DGifGetLine(GifFileType * GifFile, GifPixelType * GifLine, int GifLineLen); int DGifGetPixel(GifFileType * GifFile, GifPixelType GifPixel); int DGifGetComment(GifFileType * GifFile, char *GifComment); int DGifGetExtension(GifFileType * GifFile, int *GifExtCode, GifByteType ** GifExtension); int DGifGetExtensionNext(GifFileType * GifFile, GifByteType ** GifExtension); int DGifGetCode(GifFileType * GifFile, int *GifCodeSize, GifByteType ** GifCodeBlock); int DGifGetCodeNext(GifFileType * GifFile, GifByteType ** GifCodeBlock); int DGifGetLZCodes(GifFileType * GifFile, int *GifCode); int DGifCloseFile(GifFileType * GifFile); #define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */ #define D_GIF_ERR_READ_FAILED 102 #define D_GIF_ERR_NOT_GIF_FILE 103 #define D_GIF_ERR_NO_SCRN_DSCR 104 #define D_GIF_ERR_NO_IMAG_DSCR 105 #define D_GIF_ERR_NO_COLOR_MAP 106 #define D_GIF_ERR_WRONG_RECORD 107 #define D_GIF_ERR_DATA_TOO_BIG 108 #define D_GIF_ERR_NOT_ENOUGH_MEM 109 #define D_GIF_ERR_CLOSE_FAILED 110 #define D_GIF_ERR_NOT_READABLE 111 #define D_GIF_ERR_IMAGE_DEFECT 112 #define D_GIF_ERR_EOF_TOO_SOON 113 /****************************************************************************** * O.K., here are the routines from GIF_LIB file QUANTIZE.C. ******************************************************************************/ int QuantizeBuffer(unsigned int Width, unsigned int Height, int *ColorMapSize, GifByteType * RedInput, GifByteType * GreenInput, GifByteType * BlueInput, GifByteType * OutputBuffer, GifColorType * OutputColorMap); /****************************************************************************** * O.K., here are the routines from GIF_LIB file QPRINTF.C. ******************************************************************************/ extern int GifQuietPrint; #ifdef HAVE_STDARG_H extern void GifQprintf(char *Format, ...); #elif defined (HAVE_VARARGS_H) extern void GifQprintf(); #endif /* HAVE_STDARG_H */ /****************************************************************************** * O.K., here are the routines from GIF_LIB file GIF_ERR.C. ******************************************************************************/ #ifndef _GBA_NO_FILEIO extern void PrintGifError(void); #endif /* _GBA_NO_FILEIO */ extern int GifLastError(void); /****************************************************************************** * O.K., here are the routines from GIF_LIB file DEV2GIF.C. ******************************************************************************/ extern int DumpScreen2Gif(const char *FileName, int ReqGraphDriver, long ReqGraphMode1, long ReqGraphMode2, long ReqGraphMode3); /***************************************************************************** * * Everything below this point is new after version 1.2, supporting `slurp * mode' for doing I/O in two big belts with all the image-bashing in core. * *****************************************************************************/ /****************************************************************************** * Color Map handling from ALLOCGIF.C *****************************************************************************/ extern ColorMapObject *MakeMapObject(int ColorCount, const GifColorType * ColorMap); extern void FreeMapObject(ColorMapObject * Object); extern ColorMapObject *UnionColorMap(const ColorMapObject * ColorIn1, const ColorMapObject * ColorIn2, GifPixelType ColorTransIn2[]); extern int BitSize(int n); /****************************************************************************** * Support for the in-core structures allocation (slurp mode). *****************************************************************************/ /* This is the in-core version of an extension record */ typedef struct { int ByteCount; char *Bytes; /* on malloc(3) heap */ int Function; /* Holds the type of the Extension block. */ } ExtensionBlock; /* This holds an image header, its unpacked raster bits, and extensions */ typedef struct SavedImage { GifImageDesc ImageDesc; unsigned char *RasterBits; /* on malloc(3) heap */ int Function; /* DEPRECATED: Use ExtensionBlocks[x].Function instead */ int ExtensionBlockCount; ExtensionBlock *ExtensionBlocks; /* on malloc(3) heap */ } SavedImage; extern void ApplyTranslation(SavedImage * Image, GifPixelType Translation[]); extern void MakeExtension(SavedImage * New, int Function); extern int AddExtensionBlock(SavedImage * New, int Len, unsigned char ExtData[]); extern void FreeExtension(SavedImage * Image); extern SavedImage *MakeSavedImage(GifFileType * GifFile, const SavedImage * CopyFrom); extern void FreeSavedImages(GifFileType * GifFile); /****************************************************************************** * The library's internal utility font *****************************************************************************/ #define GIF_FONT_WIDTH 8 #define GIF_FONT_HEIGHT 8 extern unsigned char AsciiTable[][GIF_FONT_WIDTH]; #ifdef _WIN32 extern void DrawGifText(SavedImage * Image, #else extern void DrawText(SavedImage * Image, #endif const int x, const int y, const char *legend, const int color); extern void DrawBox(SavedImage * Image, const int x, const int y, const int w, const int d, const int color); void DrawRectangle(SavedImage * Image, const int x, const int y, const int w, const int d, const int color); extern void DrawBoxedText(SavedImage * Image, const int x, const int y, const char *legend, const int border, const int bg, const int fg); #ifdef __cplusplus } #endif /* __cplusplus */ #endif /* _GIF_LIB_H */