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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)

#ifndef GIF_LIB_H
#define GIF_LIB_H

#define GIF_LIB_VERSION " Version 2.0, "

#define     GIF_ERROR   0
#define GIF_OK          1

#ifndef TRUE
#define TRUE            1
#define FALSE           0

#ifndef NULL
#define NULL            0
#endif /* NULL */

#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;

#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 *
#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 */

typedef struct GifImageDesc {
    int Left, Top, Width, Height,   /* Current image dimensions. */
      Interlace;              /* Sequential/Interlaced lines. */
    ColorMapObject *ColorMap;       /* The local color map */
} GifImageDesc;

typedef struct GifFileType {
    int 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 Private;                /* Don't mess with this! */
} GifFileType;

typedef enum {
    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_X_WINDOW = 1001
} GifScreenDumpType;

*  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(char *GifFileName, int GifTestExistance);
GifFileType *EGifOpenFileHandle(int GifFileHandle);
int EGifSpew(GifFileType *GifFile);
void EGifSetGifVersion(char *Version);
int EGifPutScreenDesc(GifFileType *GifFile,
      int GifWidth, int GifHeight, int GifColorRes, int GifBackGround,
      ColorMapObject *GifColorMap);
int EGifPutImageDesc(GifFileType *GifFile,
      int GifLeft, int GifTop, int Width, int GifHeight, int GifInterlace,
      ColorMapObject *GifColorMap);
int EGifPutLine(GifFileType *GifFile, GifPixelType *GifLine, int GifLineLen);
int EGifPutPixel(GifFileType *GifFile, GifPixelType GifPixel);
int EGifPutComment(GifFileType *GifFile, char *GifComment);
int EGifPutExtension(GifFileType *GifFile, int GifExtCode, int GifExtLen,
                                          VoidPtr GifExtension);
int EGifPutExtensionHeader(GifFileType *GifFile, int GifExtCode);
int EGifPutExtensionBlock(GifFileType *GifFile, int GifExtLen,
                                          VoidPtr GifExtension);
int EGifPutCode(GifFileType *GifFile, int GifCodeSize,
                                       GifByteType *GifCodeBlock);
int EGifPutCodeNext(GifFileType *GifFile, 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_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).                                      *

GifFileType *DGifOpenFileName(const char *GifFileName);
GifFileType *DGifOpenFileHandle(int GifFileHandle);
int DGifSlurp(GifFileType *GifFile);
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_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;

extern void GifQprintf();
extern void GifQprintf(char *Format, ...);
#endif /* USE_VARARGS */

* O.K., here are the routines from GIF_LIB file GIF_ERR.C.              *
extern void PrintGifError(void);
extern int GifLastError(void);

* O.K., here are the routines from GIF_LIB file DEV2GIF.C.              *
extern int DumpScreen2Gif(char *FileName,
                    int ReqGraphDriver,
                    int ReqGraphMode1,
                    int ReqGraphMode2,
                    int 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, GifColorType *ColorMap);
extern void FreeMapObject(ColorMapObject *Object);
extern ColorMapObject *UnionColorMap(ColorMapObject *ColorIn1,
                        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 */
} ExtensionBlock;

/* This holds an image header, its unpacked raster bits, and extensions */
typedef struct SavedImage {
    GifImageDesc  ImageDesc;

    char          *RasterBits;            /* on malloc(3) heap */

    int                 Function;
    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, char ExtData[]);
extern void FreeExtension(SavedImage *Image);

extern SavedImage *MakeSavedImage(GifFileType *GifFile, SavedImage *CopyFrom);
extern void FreeSavedImages(GifFileType *GifFile);

* The library's internal utility font                                   *

#define GIF_FONT_WIDTH  8
extern unsigned char AsciiTable[][GIF_FONT_WIDTH];

extern void DrawText(SavedImage *Image,
                 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);

#endif /* GIF_LIB_H */

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