/**************************************************************************
 *{@C
 *      Copyright:      1988-2020 Paul Obermeier (obermeier@poSoft.de)
 *
 *      Module:         FileFormats
 *      Filename:       FF_ImageSgiLib.h
 *
 *      Author:         Paul Obermeier
 *
 *	Description: 	Original "image.h" file as supplied by SGI, slightly
 *			modified for usage in poSoft's library.
 *
 *      Additional documentation:
 *			None.
 *
 **************************************************************************/

#ifndef __FF_IMAGESGILIB_H__
#define __FF_IMAGESGILIB_H__

#ifndef	__GL_IMAGE_H__
#define	__GL_IMAGE_H__
#ifdef __cplusplus
extern "C" {
#endif


/*
 *	Defines for image files . . . .
 *
 *  			Paul Haeberli - 1984
 *      Look in /usr/people/4Dgifts/iristools/imgtools for example code!
 *
 */

#include <stdio.h>

#define IMAGIC 	0732

/* colormap of images */
#define CM_NORMAL		0	/* file contains rows of values which 
					 * are either RGB values (zsize == 3) 
					 * or greyramp values (zsize == 1) */
#define CM_DITHERED		1
#define CM_SCREEN		2	/* file contains data which is a screen
					 * image; getrow returns buffer which 
					 * can be displayed directly with 
					 * writepixels */
#define CM_COLORMAP		3	/* a colormap file */

#define TYPEMASK		0xff00
#define BPPMASK			0x00ff
#define ITYPE_VERBATIM		0x0000
#define ITYPE_RLE		0x0100
#define ISRLE(type)		(((type) & 0xff00) == ITYPE_RLE)
#define ISVERBATIM(type)	(((type) & 0xff00) == ITYPE_VERBATIM)
#define BPP(type)		((type) & BPPMASK)
#define RLE(bpp)		(ITYPE_RLE | (bpp))
#define VERBATIM(bpp)		(ITYPE_VERBATIM | (bpp))
#define	IBUFSIZE(pixels)	((pixels+(pixels>>6))<<2)
#define	RLE_NOP			0x00

#define	ierror(p)		(((p)->flags&_IOERR)!=0)
#define	ifileno(p)		((p)->file)
#define	getpix(p)		(--(p)->cnt>=0 ? *(p)->ptr++ : ifilbuf(p))
#define putpix(p,x)		(--(p)->cnt>=0 \
				    ? ((int)(*(p)->ptr++=(unsigned)(x))) \
				    : iflsbuf(p,(unsigned)(x)))

typedef struct {
    unsigned short	imagic;		/* stuff saved on disk . . */
    unsigned short 	type;
    unsigned short 	dim;
    unsigned short 	xsize;
    unsigned short 	ysize;
    unsigned short 	zsize;
    unsigned int 	min;
    unsigned int 	max;
    unsigned int	wastebytes;	
    char 		name[80];
    unsigned int	colormap;

    FILE * 		file;		/* stuff used in core only */
    unsigned short 	flags;
    short		dorev;
    short		x;
    short		y;
    short		z;
    short		cnt;
    unsigned short	*ptr;
    unsigned short	*base;
    unsigned short	*tmpbuf;
    unsigned int	offset;
    unsigned int	rleend;		/* for rle images */
    unsigned int	*rowstart;	/* for rle images */
    int 		*rowsize;	/* for rle images */
} IMAGE;

extern IMAGE *sgiOpen (const char *file, const char *mode, unsigned int type, unsigned int dim,
                       unsigned int xsize, unsigned int ysize, unsigned int zsize );
extern int sgiClose (IMAGE *image);
extern int sgiPutrow (IMAGE *image, unsigned short *buffer,
		   unsigned int y, unsigned int z);
extern int sgiGetrow (IMAGE *image, unsigned short *buffer,
		   unsigned int y, unsigned int z);

#define IMAGEDEF		/* for backwards compatibility */
#ifdef __cplusplus
}
#endif
#endif	/* !__GL_IMAGE_H__ */

#endif /* __FF_IMAGESGILIB_H__ */
