#ifndef lint
static const char	RCSid[] = "$Id: resolu.c,v 2.3 2003/02/22 02:07:22 greg Exp $";
#endif
/*
 * Read and write image resolutions.
 *
 * Externals declared in resolu.h
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact radiance@radsite.lbl.gov.
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#include "resolu.h"


char  resolu_buf[RESOLU_BUFLEN];	/* resolution line buffer */


void
fputresolu(ord, sl, ns, fp)		/* put out picture dimensions */
int  ord;			/* scanline ordering */
int  sl, ns;			/* scanline length and number */
FILE  *fp;
{
	RESOLU  rs;

	if ((rs.rt = ord) & YMAJOR) {
		rs.xr = sl;
		rs.yr = ns;
	} else {
		rs.xr = ns;
		rs.yr = sl;
	}
	fputsresolu(&rs, fp);
}


int
fgetresolu(sl, ns, fp)			/* get picture dimensions */
int  *sl, *ns;			/* scanline length and number */
FILE  *fp;
{
	RESOLU  rs;

	if (!fgetsresolu(&rs, fp))
		return(-1);
	if (rs.rt & YMAJOR) {
		*sl = rs.xr;
		*ns = rs.yr;
	} else {
		*sl = rs.yr;
		*ns = rs.xr;
	}
	return(rs.rt);
}


char *
resolu2str(buf, rp)		/* convert resolution struct to line */
char  *buf;
register RESOLU  *rp;
{
	if (rp->rt&YMAJOR)
		sprintf(buf, "%cY %d %cX %d\n",
				rp->rt&YDECR ? '-' : '+', rp->yr,
				rp->rt&XDECR ? '-' : '+', rp->xr);
	else
		sprintf(buf, "%cX %d %cY %d\n",
				rp->rt&XDECR ? '-' : '+', rp->xr,
				rp->rt&YDECR ? '-' : '+', rp->yr);
	return(buf);
}


int
str2resolu(rp, buf)		/* convert resolution line to struct */
register RESOLU  *rp;
char  *buf;
{
	register char  *xndx, *yndx;
	register char  *cp;

	if (buf == NULL)
		return(0);
	xndx = yndx = NULL;
	for (cp = buf; *cp; cp++)
		if (*cp == 'X')
			xndx = cp;
		else if (*cp == 'Y')
			yndx = cp;
	if (xndx == NULL || yndx == NULL)
		return(0);
	rp->rt = 0;
	if (xndx > yndx) rp->rt |= YMAJOR;
	if (xndx[-1] == '-') rp->rt |= XDECR;
	if (yndx[-1] == '-') rp->rt |= YDECR;
	if ((rp->xr = atoi(xndx+1)) <= 0)
		return(0);
	if ((rp->yr = atoi(yndx+1)) <= 0)
		return(0);
	return(1);
}