/*
  ESE 558 Digital Image Processing 

  rasio.h

  header file for sun rasterfile I/O routines

  sun raster io header file 
*/

#ifndef _rasio_h
#define _rasio_h

#define HIBYTE(w)   ((unsigned char) (((short int) (w) >> 8) & 0xFF))
#define LOBYTE(w)   ((unsigned char) (short int) w)
#define HIWORD(l)   ((short int) (( (int) (l) >> 16) & 0xFFFF))
#define LOWORD(l)   ((short int) (l))

#define	RAS_MAGIC	0x59a66a95

	/* Sun supported ras_type's */
#define RT_OLD		0	/* Raw pixrect image in 68000 byte order */
#define RT_STANDARD	1	/* Raw pixrect image in 68000 byte order */
#define RT_BYTE_ENCODED	2	/* Run-length compression of bytes */
#define RT_FORMAT_RGB	3	/* XRGB or RGB instead of XBGR or BGR */
#define RT_FORMAT_TIFF	4	/* tiff <-> standard rasterfile */
#define RT_FORMAT_IFF	5	/* iff (TAAC format) <-> standard rasterfile */
#define RT_EXPERIMENTAL 0xffff	/* Reserved for testing */

	/* Sun registered ras_maptype's */
#define RMT_RAW		2

	/* Sun supported ras_maptype's */
#define RMT_NONE	0	/* ras_maplength is expected to be 0 */
#define RMT_EQUAL_RGB	1	/* red[ras_maplength/3],green[],blue[] */


/*
 * NOTES:
 * 	Each line of the image is rounded out to a multiple of 16 bits.
 *   This corresponds to the rounding convention used by the memory pixrect
 *   package (/usr/include/pixrect/memvar.h) of the SunWindows system.
 *	The ras_encoding field (always set to 0 by Sun's supported software)
 *   was renamed to  length in release 2.0.  As a result, rasterfiles
 *   of type 0 generated by the old software claim to have 0 length; for
 *   compatibility, code reading rasterfiles must be prepared to compute the
 *   true length from the width, height, and depth fields.
 */



/*
 * Description of header for files containing raster images
 */


typedef struct {
	int	 magic;		/* magic number */
	int	 width;		/* width (pixels) of image */
	int	 height;		/* height (pixels) of image */
	int	 depth;		/* depth (1, 8, or 24 bits) of pixel */
	int	 length;		/* length (bytes) of image */
	int	 type;		/* type of file; see RT_* below */
	int	 maptype;		/* type of colormap; see RMT_* below */
	int	 maplength;		/* length (bytes) of following map */

	/* color map follows for  maplength bytes, followed by image */
} Raster_header;



/* defines the actual raster file */
typedef struct {

    Raster_header *header;
    unsigned char **image;

} Raster_file;

/* prototypes */
Raster_file *read_raster_file(char *infilename);
void write_raster_file(char *outfilename,unsigned char **image, int height, int width);
unsigned char **pic_alloc(int rows,int cols) ;
void swap_int(int *input);
void swap_header( Raster_header *header);
void free_pic( unsigned char **pic, int rows);
#endif