#ifndef lint
static	char sccsid[] = "@(#)pr_reverse.c 9.2 88/01/19 Copyr 1983 Sun Micro";
#endif

/*
 * Copyright (c) 1983 by Sun Microsystems, Inc.
 */

/*
 * Two operations on operations, reversesrc and reversedst, are provided
 * for adjusting the operation code to take into account video reversing
 * of either the source or the destination.  These are implemented by
 * table lookup.  This process can be iterated, as in
 *	pr_reversedst[pr_reversesrc[op]].
 *
 * Note that the "op" that these tables reverses is shifted down one bit
 * from the "op" described in the header file.  In other words, it's not
 * what you expect, so look again.  FIXME.
 */

#include <sys/types.h>
#ifdef REF
#include <ref/config.h>
#endif
#include <pixrect/pixrect.h>

char	pr_reversedst[16] = {	/* NB: reverses both input and output */
	15, 13, 14, 12,
	 7,  5,  6,  4,
	11,  9, 10,  8,
	 3,  1,  2,  0,
};

char	pr_reversesrc[16] = {	/* transpose of the 4x4 identity */
	0,  4,  8,  12,
	1,  5,  9,  13,
	2,  6, 10,  14,
	3,  7, 11,  15,

};

/*
 * NOTE THAT THE FOLLOWING FUNCTION IS ONLY INCLUDED HERE BECAUSE OF
 * CURRENT SUNWINDOWS DEPENDENCIES IN THE SUN CODE.  WHEN SUNWINDOWS
 * DEPENDENCIES ARE ELIMINATED, THIS FUNCTION SHOULD BE ALSO.
 */

pr_reversevideo( pr, min, max)
	struct pixrect *pr;
	int min, max;
{
	unsigned char bkgnd, frgnd;

	pr_getcolormap( pr, min, 1, &bkgnd,&bkgnd,&bkgnd);
	pr_getcolormap( pr, max, 1, &frgnd,&frgnd,&frgnd);
	pr_putcolormap( pr, max, 1, &bkgnd,&bkgnd,&bkgnd);
	pr_putcolormap( pr, min, 1, &frgnd,&frgnd,&frgnd);
}