/****
  giflib/giflib.h
  kirk johnson
  may 1990

  RCS $Id: giflib.h,v 1.2 1993/07/23 03:53:53 tuna Exp $

  external interface to gifin.c and gifout.c

  Copyright 1989, 1990 by Kirk L. Johnson (see the included
  file "kljcpyrt.h" for complete copyright information)
  ****/

#ifndef _GIFLIB_H_
#define _GIFLIB_H_

#include "kljcpyrt.h"

/*
 * giflib return codes
 */

#define GIFLIB_SUCCESS       0  /* success */
#define GIFLIB_DONE          1  /* no more images */

#define GIFLIB_ERR_BAD_SD   -1  /* bad screen descriptor */
#define GIFLIB_ERR_BAD_SEP  -2  /* bad image separator */
#define GIFLIB_ERR_BAD_SIG  -3  /* bad signature */
#define GIFLIB_ERR_EOD      -4  /* unexpected end of raster data */
#define GIFLIB_ERR_EOF      -5  /* unexpected end of input stream */
#define GIFLIB_ERR_OUT      -6  /* i/o output error */
#define GIFLIB_ERR_FAO      -7  /* file already open */
#define GIFLIB_ERR_IAO      -8  /* image already open */
#define GIFLIB_ERR_ISO      -9  /* image still open */
#define GIFLIB_ERR_NFO     -10  /* no file open */
#define GIFLIB_ERR_NIO     -11  /* no image open */

/*
 * colormap indices
 */

#define GIFLIB_RED  0
#define GIFLIB_GRN  1
#define GIFLIB_BLU  2

/*
 * typedef BYTE for convenience
 */

typedef unsigned char BYTE;

/*
 * procedures exported by gifin.c
 */

extern int gifin_open_file();
extern int gifin_open_image();
extern int gifin_get_pixel();
extern int gifin_get_row();
extern int gifin_close_image();
extern int gifin_close_file();

/*
 * variables exported by gifin.c
 */

extern int  gifin_rast_width;       /* raster width */
extern int  gifin_rast_height;      /* raster height */
extern BYTE gifin_g_cmap_flag;      /* global colormap flag */
extern int  gifin_g_pixel_bits;     /* bits per pixel, global colormap */
extern int  gifin_g_ncolors;        /* number of colors, global colormap */
extern BYTE gifin_g_cmap[3][256];   /* global colormap */
extern int  gifin_bg_color;         /* background color index */
extern int  gifin_color_bits;       /* bits of color resolution */

extern int  gifin_img_left;         /* image position on raster */
extern int  gifin_img_top;          /* image position on raster */
extern int  gifin_img_width;        /* image width */
extern int  gifin_img_height;       /* image height */
extern BYTE gifin_l_cmap_flag;      /* local colormap flag */
extern int  gifin_l_pixel_bits;     /* bits per pixel, local colormap */
extern int  gifin_l_ncolors;        /* number of colors, local colormap */
extern BYTE gifin_l_cmap[3][256];   /* local colormap */
extern BYTE gifin_interlace_flag;   /* interlace image format flag */

/*
 * procedures exported by gifout.c
 */

extern int  gifout_open_file();
extern int  gifout_open_image();
extern void gifout_put_pixel();
extern void gifout_put_row();
extern int  gifout_close_image();
extern int  gifout_close_file();

#endif