src/common/image.c

#ifndef lint
static const char       RCSid[] = "$Id: image.c,v 2.51 2020/05/14 20:49:57 greg Exp $";
#endif
/*
 *  image.c - routines for image generation.
 *
 *  External symbols declared in view.h
 */

#include "copyright.h"

#include  <ctype.h>
#include  "rtio.h"
#include  "rtmath.h"
#include  "paths.h"
#include  "view.h"

VIEW  stdview = STDVIEW;                /* default view parameters */

static gethfunc gethview;


char *
setview(                /* set hvec and vvec, return message on error */
VIEW  *v
)
{
        static char  ill_horiz[] = "illegal horizontal view size";
        static char  ill_vert[] = "illegal vertical view size";
        
        if ((v->vfore < -FTINY) | (v->vaft < -FTINY) ||
                        (v->vaft > FTINY) & (v->vaft <= v->vfore))
                return("illegal fore/aft clipping plane");

        if (v->vdist <= FTINY)
                return("illegal view distance");
        v->vdist *= normalize(v->vdir);         /* normalize direction */
        if (v->vdist == 0.0)
                return("zero view direction");

        if (normalize(v->vup) == 0.0)           /* normalize view up */
                return("zero view up vector");

        fcross(v->hvec, v->vdir, v->vup);       /* compute horiz dir */

        if (normalize(v->hvec) == 0.0)
                return("view up parallel to view direction");

        fcross(v->vvec, v->hvec, v->vdir);      /* compute vert dir */

        if (v->horiz <= FTINY)
                return(ill_horiz);
        if (v->vert <= FTINY)
                return(ill_vert);

        switch (v->type) {
        case VT_PAR:                            /* parallel view */
                v->hn2 = v->horiz;
                v->vn2 = v->vert;
                break;
        case VT_PER:                            /* perspective view */
                if (v->horiz >= 180.0-FTINY)
                        return(ill_horiz);
                if (v->vert >= 180.0-FTINY)
                        return(ill_vert);
                v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
                v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
                break;
        case VT_CYL:                            /* cylindrical panorama */
                if (v->horiz > 360.0+FTINY)
                        return(ill_horiz);
                if (v->vert >= 180.0-FTINY)
                        return(ill_vert);
                v->hn2 = v->horiz * (PI/180.0);
                v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
                break;
        case VT_ANG:                            /* angular fisheye */
                if (v->horiz > 360.0+FTINY)
                        return(ill_horiz);
                if (v->vert > 360.0+FTINY)
                        return(ill_vert);
                v->hn2 = v->horiz * (PI/180.0);
                v->vn2 = v->vert * (PI/180.0);
                break;
        case VT_HEM:                            /* hemispherical fisheye */
                if (v->horiz > 180.0+FTINY)
                        return(ill_horiz);
                if (v->vert > 180.0+FTINY)
                        return(ill_vert);
                v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0));
                v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0));
                break;
        case VT_PLS:                            /* planispheric fisheye */
                if (v->horiz >= 360.0-FTINY)
                        return(ill_horiz);
                if (v->vert >= 360.0-FTINY)
                        return(ill_vert);
                v->hn2 = 2.*sin(v->horiz*(PI/180.0/2.0)) /
                                (1.0 + cos(v->horiz*(PI/180.0/2.0)));
                v->vn2 = 2.*sin(v->vert*(PI/180.0/2.0)) /
                                (1.0 + cos(v->vert*(PI/180.0/2.0)));
                break;
        default:
                return("unknown view type");
        }
        if (v->type != VT_ANG && v->type != VT_PLS) {
                if (v->type != VT_CYL) {
                        v->hvec[0] *= v->hn2;
                        v->hvec[1] *= v->hn2;
                        v->hvec[2] *= v->hn2;
                }
                v->vvec[0] *= v->vn2;
                v->vvec[1] *= v->vn2;
                v->vvec[2] *= v->vn2;
        }
        v->hn2 *= v->hn2;
        v->vn2 *= v->vn2;

        return(NULL);
}


void
normaspect(                             /* fix pixel aspect or resolution */
double  va,                     /* view aspect ratio */
double  *ap,                    /* pixel aspect in (or out if 0) */
int  *xp,
int  *yp                        /* x and y resolution in (or out if *ap!=0) */
)
{
        if (*ap <= FTINY)
                *ap = va * *xp / *yp;           /* compute pixel aspect */
        else if (va * *xp > *ap * *yp)
                *xp = *yp / va * *ap + .5;      /* reduce x resolution */
        else
                *yp = *xp * va / *ap + .5;      /* reduce y resolution */
}


double
viewray(                                /* compute ray origin and direction */
FVECT  orig,
FVECT  direc,
VIEW  *v,
double  x,
double  y
)
{
        double  d, z;
        
        x += v->hoff - 0.5;
        y += v->voff - 0.5;

        switch(v->type) {
        case VT_PAR:                    /* parallel view */
                orig[0] = v->vp[0] + v->vfore*v->vdir[0]
                                + x*v->hvec[0] + y*v->vvec[0];
                orig[1] = v->vp[1] + v->vfore*v->vdir[1]
                                + x*v->hvec[1] + y*v->vvec[1];
                orig[2] = v->vp[2] + v->vfore*v->vdir[2]
                                + x*v->hvec[2] + y*v->vvec[2];
                VCOPY(direc, v->vdir);
                return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
        case VT_PER:                    /* perspective view */
                direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                VSUM(orig, v->vp, direc, v->vfore);
                d = normalize(direc);
                return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
        case VT_HEM:                    /* hemispherical fisheye */
                z = 1.0 - x*x*v->hn2 - y*y*v->vn2;
                if (z < 0.0)
                        return(-1.0);
                z = sqrt(z);
                direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                VSUM(orig, v->vp, direc, v->vfore);
                return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
        case VT_CYL:                    /* cylindrical panorama */
                d = x * v->horiz * (PI/180.0);
                z = cos(d);
                x = sin(d);
                direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                VSUM(orig, v->vp, direc, v->vfore);
                d = normalize(direc);
                return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
        case VT_ANG:                    /* angular fisheye */
                x *= (1.0/180.0)*v->horiz;
                y *= (1.0/180.0)*v->vert;
                d = x*x + y*y;
                if (d > 1.0)
                        return(-1.0);
                d = sqrt(d);
                z = cos(PI*d);
                d = d <= FTINY ? PI : sqrt(1.0 - z*z)/d;
                x *= d;
                y *= d;
                direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                VSUM(orig, v->vp, direc, v->vfore);
                return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
        case VT_PLS:                    /* planispheric fisheye */
                x *= sqrt(v->hn2);
                y *= sqrt(v->vn2);
                d = x*x + y*y;
                z = (1. - d)/(1. + d);
                x *= (1. + z);
                y *= (1. + z);
                direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                VSUM(orig, v->vp, direc, v->vfore);
                return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
        }
        return(-1.0);
}


int
viewloc(                        /* find image location for point */
FVECT  ip,
VIEW  *v,
FVECT  p
)       /* Use VL_* flags to interpret return value */
{
        int     rflags = VL_GOOD;
        double  d, d2;
        FVECT  disp;

        VSUB(disp, p, v->vp);

        switch (v->type) {
        case VT_PAR:                    /* parallel view */
                ip[2] = DOT(disp,v->vdir) - v->vfore;
                break;
        case VT_PER:                    /* perspective view */
                d = DOT(disp,v->vdir);
                if ((v->vaft > FTINY) & (d >= v->vaft))
                        rflags |= VL_BEYOND;
                ip[2] = VLEN(disp);
                if (d < -FTINY) {       /* fold pyramid */
                        ip[2] = -ip[2];
                        d = -d;
                } else if (d <= FTINY)
                        return(VL_BAD); /* at infinite edge */
                d = 1.0/d;
                disp[0] *= d;
                disp[1] *= d;
                disp[2] *= d;
                if (ip[2] < 0.0) d = -d;
                ip[2] *= (1.0 - v->vfore*d);
                break;
        case VT_HEM:                    /* hemispherical fisheye */
                d = normalize(disp);
                if (DOT(disp,v->vdir) < 0.0)
                        ip[2] = -d;
                else
                        ip[2] = d;
                ip[2] -= v->vfore;
                break;
        case VT_CYL:                    /* cylindrical panorama */
                d = DOT(disp,v->hvec);
                d2 = DOT(disp,v->vdir);
                ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff;
                d2 = d*d + d2*d2;
                if (d2 <= FTINY*FTINY)
                        return(VL_BAD); /* at pole */
                if ((v->vaft > FTINY) & (d2 >= v->vaft*v->vaft))
                        rflags |= VL_BEYOND;
                d = 1.0/sqrt(d2);
                ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff;
                ip[2] = VLEN(disp);
                ip[2] *= (1.0 - v->vfore*d);
                goto gotall;
        case VT_ANG:                    /* angular fisheye */
                ip[0] = 0.5 - v->hoff;
                ip[1] = 0.5 - v->voff;
                ip[2] = normalize(disp) - v->vfore;
                d = DOT(disp,v->vdir);
                if (d >= 1.0-FTINY)
                        goto gotall;
                if (d <= -(1.0-FTINY)) {
                        ip[0] += 180.0/v->horiz;
                        goto gotall;
                }
                d = (180.0/PI)*acos(d) / sqrt(1.0 - d*d);
                ip[0] += DOT(disp,v->hvec)*d/v->horiz;
                ip[1] += DOT(disp,v->vvec)*d/v->vert;
                goto gotall;
        case VT_PLS:                    /* planispheric fisheye */
                ip[0] = 0.5 - v->hoff;
                ip[1] = 0.5 - v->voff;
                ip[2] = normalize(disp) - v->vfore;
                d = DOT(disp,v->vdir);
                if (d >= 1.0-FTINY)
                        goto gotall;
                if (d <= -(1.0-FTINY))
                        return(VL_BAD);
                ip[0] += DOT(disp,v->hvec)/((1. + d)*sqrt(v->hn2));
                ip[1] += DOT(disp,v->vvec)/((1. + d)*sqrt(v->vn2));
                goto gotall;
        default:
                return(VL_BAD);
        }
        ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
        ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
gotall:                                 /* add appropriate return flags */
        if (ip[2] <= 0.0)
                rflags |= VL_BEHIND;
        else if ((v->type != VT_PER) & (v->type != VT_CYL))
                rflags |= VL_BEYOND*((v->vaft > FTINY) &
                                        (ip[2] >= v->vaft - v->vfore));
        rflags |= VL_OUTSIDE*((0.0 >= ip[0]) | (ip[0] >= 1.0) |
                                (0.0 >= ip[1]) | (ip[1] >= 1.0));
        return(rflags);
}


void
pix2loc(                /* compute image location from pixel pos. */
RREAL  loc[2],
RESOLU  *rp,
int  px,
int  py
)
{
        int  x, y;

        if (rp->rt & YMAJOR) {
                x = px;
                y = py;
        } else {
                x = py;
                y = px;
        }
        if (rp->rt & XDECR)
                x = rp->xr-1 - x;
        if (rp->rt & YDECR)
                y = rp->yr-1 - y;
        loc[0] = (x+.5)/rp->xr;
        loc[1] = (y+.5)/rp->yr;
}


void
loc2pix(                        /* compute pixel pos. from image location */
int  pp[2],
RESOLU  *rp,
double  lx,
double  ly
)
{
        int  x, y;

        x = (int)(lx*rp->xr + .5 - (lx < 0.0));
        y = (int)(ly*rp->yr + .5 - (ly < 0.0));

        if (rp->rt & XDECR)
                x = rp->xr-1 - x;
        if (rp->rt & YDECR)
                y = rp->yr-1 - y;
        if (rp->rt & YMAJOR) {
                pp[0] = x;
                pp[1] = y;
        } else {
                pp[0] = y;
                pp[1] = x;
        }
}


int
getviewopt(                             /* process view argument */
VIEW  *v,
int  ac,
char  *av[]
)
{
#define check(c,l)      if ((av[0][c]&&!isspace(av[0][c])) || \
                        badarg(ac-1,av+1,l)) return(-1)

        if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v')
                return(-1);
        switch (av[0][2]) {
        case 't':                       /* type */
                if (!av[0][3] || isspace(av[0][3]))
                        return(-1);
                check(4,"");
                v->type = av[0][3];
                return(0);
        case 'p':                       /* point */
                check(3,"fff");
                v->vp[0] = atof(av[1]);
                v->vp[1] = atof(av[2]);
                v->vp[2] = atof(av[3]);
                return(3);
        case 'd':                       /* direction */
                check(3,"fff");
                v->vdir[0] = atof(av[1]);
                v->vdir[1] = atof(av[2]);
                v->vdir[2] = atof(av[3]);
                v->vdist = 1.;
                return(3);
        case 'u':                       /* up */
                check(3,"fff");
                v->vup[0] = atof(av[1]);
                v->vup[1] = atof(av[2]);
                v->vup[2] = atof(av[3]);
                return(3);
        case 'h':                       /* horizontal size */
                check(3,"f");
                v->horiz = atof(av[1]);
                return(1);
        case 'v':                       /* vertical size */
                check(3,"f");
                v->vert = atof(av[1]);
                return(1);
        case 'o':                       /* fore clipping plane */
                check(3,"f");
                v->vfore = atof(av[1]);
                return(1);
        case 'a':                       /* aft clipping plane */
                check(3,"f");
                v->vaft = atof(av[1]);
                return(1);
        case 's':                       /* shift */
                check(3,"f");
                v->hoff = atof(av[1]);
                return(1);
        case 'l':                       /* lift */
                check(3,"f");
                v->voff = atof(av[1]);
                return(1);
        default:
                return(-1);
        }
#undef check
}


int
sscanview(                              /* get view parameters from string */
VIEW  *vp,
char  *s
)
{
        int  ac;
        char  *av[4];
        int  na;
        int  nvopts = 0;

        while (isspace(*s))
                if (!*s++)
                        return(0);
        while (*s) {
                ac = 0;
                do {
                        if (ac || *s == '-')
                                av[ac++] = s;
                        while (*s && !isspace(*s))
                                s++;
                        while (isspace(*s))
                                s++;
                } while (*s && ac < 4);
                if ((na = getviewopt(vp, ac, av)) >= 0) {
                        if (na+1 < ac)
                                s = av[na+1];
                        nvopts++;
                } else if (ac > 1)
                        s = av[1];
        }
        return(nvopts);
}


void
fprintview(                             /* write out view parameters */
VIEW  *vp,
FILE  *fp
)
{
        fprintf(fp, " -vt%c", vp->type);
        fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
        fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist,
                                                vp->vdir[1]*vp->vdist,
                                                vp->vdir[2]*vp->vdist);
        fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
        fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
        fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft);
        fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
}


char *
viewopt(                                /* translate to minimal view string */
VIEW  *vp
)
{
        static char  vwstr[128];
        char  *cp = vwstr;

        *cp = '\0';
        if (vp->type != stdview.type) {
                sprintf(cp, " -vt%c", vp->type);
                cp += strlen(cp);
        }
        if (!VABSEQ(vp->vp,stdview.vp)) {
                sprintf(cp, " -vp %.6g %.6g %.6g",
                                vp->vp[0], vp->vp[1], vp->vp[2]);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->vdist,stdview.vdist) || !VABSEQ(vp->vdir,stdview.vdir)) {
                sprintf(cp, " -vd %.6g %.6g %.6g",
                                vp->vdir[0]*vp->vdist,
                                vp->vdir[1]*vp->vdist,
                                vp->vdir[2]*vp->vdist);
                cp += strlen(cp);
        }
        if (!VABSEQ(vp->vup,stdview.vup)) {
                sprintf(cp, " -vu %.6g %.6g %.6g",
                                vp->vup[0], vp->vup[1], vp->vup[2]);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->horiz,stdview.horiz)) {
                sprintf(cp, " -vh %.6g", vp->horiz);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->vert,stdview.vert)) {
                sprintf(cp, " -vv %.6g", vp->vert);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->vfore,stdview.vfore)) {
                sprintf(cp, " -vo %.6g", vp->vfore);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->vaft,stdview.vaft)) {
                sprintf(cp, " -va %.6g", vp->vaft);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->hoff,stdview.hoff)) {
                sprintf(cp, " -vs %.6g", vp->hoff);
                cp += strlen(cp);
        }
        if (!FABSEQ(vp->voff,stdview.voff)) {
                sprintf(cp, " -vl %.6g", vp->voff);
                cp += strlen(cp);
        }
        return(vwstr);
}


int
isview(                                 /* is this a view string? */
char  *s
)
{
        static char  *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL};
        extern char  *progname;
        char  *cp;
        char  **an;
                                        /* add program name to list */
        if (altname[0] == NULL) {
                for (cp = progname; *cp; cp++)
                        ;
                while (cp > progname && !ISDIRSEP(cp[-1]))
                        cp--;
                altname[0] = cp;
        }
                                        /* skip leading path */
        cp = s;
        while (*cp && !isspace(*cp))
                cp++;
        while (cp > s && !ISDIRSEP(cp[-1]))
                cp--;
        for (an = altname; *an != NULL; an++)
                if (!strncmp(*an, cp, strlen(*an)))
                        return(1);
        return(0);
}


struct myview {
        VIEW    *hv;
        int     ok;
};


static int
gethview(                               /* get view from header */
        char  *s,
        void  *v
)
{
        if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0)
                ((struct myview*)v)->ok++;
        return(0);
}


int
viewfile(                               /* get view from file */
char  *fname,
VIEW  *vp,
RESOLU  *rp
)
{
        struct myview   mvs;
        FILE  *fp;

        if (fname == NULL || !strcmp(fname, "-"))
                fp = stdin;
        else if ((fp = fopen(fname, "r")) == NULL)
                return(-1);

        mvs.hv = vp;
        mvs.ok = 0;

        getheader(fp, gethview, &mvs);

        if (rp != NULL && !fgetsresolu(rp, fp))
                mvs.ok = 0;

        if (fp != stdin)
                fclose(fp);

        return(mvs.ok);
}
Revision:	2.52
Committed:	Fri Feb 12 00:47:08 2021 UTC (3 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.51:	+10 -15 lines
Log Message:	refactor: added macros for RREAL comparisons
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.52	static const char RCSid[] = "$Id: image.c,v 2.51 2020/05/14 20:49:57 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* image.c - routines for image generation.
6	greg	2.16	*
7			* External symbols declared in view.h
8			*/
9
10	greg	2.17	#include "copyright.h"
11	greg	1.1
12	greg	2.32	#include <ctype.h>
13	schorsch	2.22	#include "rtio.h"
14	greg	2.28	#include "rtmath.h"
15	greg	2.27	#include "paths.h"
16	greg	1.1	#include "view.h"
17
18	greg	1.5	VIEW stdview = STDVIEW; /* default view parameters */
19	greg	1.1
20	schorsch	2.26	static gethfunc gethview;
21
22	greg	1.1
23			char *
24	greg	2.35	setview( /* set hvec and vvec, return message on error */
25			VIEW *v
26			)
27	greg	1.3	{
28	greg	1.12	static char ill_horiz[] = "illegal horizontal view size";
29			static char ill_vert[] = "illegal vertical view size";
30
31	greg	2.39	if ((v->vfore < -FTINY) \| (v->vaft < -FTINY) \|\|
32			(v->vaft > FTINY) & (v->vaft <= v->vfore))
33	greg	2.7	return("illegal fore/aft clipping plane");
34
35	greg	2.31	if (v->vdist <= FTINY)
36			return("illegal view distance");
37	greg	2.29	v->vdist = normalize(v->vdir); / normalize direction */
38			if (v->vdist == 0.0)
39	greg	1.1	return("zero view direction");
40
41	greg	1.14	if (normalize(v->vup) == 0.0) /* normalize view up */
42			return("zero view up vector");
43
44	greg	1.5	fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */
45
46			if (normalize(v->hvec) == 0.0)
47	greg	1.14	return("view up parallel to view direction");
48	greg	1.1
49	greg	1.5	fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */
50
51	greg	1.12	if (v->horiz <= FTINY)
52			return(ill_horiz);
53			if (v->vert <= FTINY)
54			return(ill_vert);
55
56			switch (v->type) {
57			case VT_PAR: /* parallel view */
58	greg	1.5	v->hn2 = v->horiz;
59	greg	1.12	v->vn2 = v->vert;
60			break;
61			case VT_PER: /* perspective view */
62			if (v->horiz >= 180.0-FTINY)
63			return(ill_horiz);
64			if (v->vert >= 180.0-FTINY)
65			return(ill_vert);
66	greg	1.5	v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
67	greg	1.12	v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
68			break;
69	greg	2.9	case VT_CYL: /* cylindrical panorama */
70			if (v->horiz > 360.0+FTINY)
71			return(ill_horiz);
72			if (v->vert >= 180.0-FTINY)
73			return(ill_vert);
74			v->hn2 = v->horiz * (PI/180.0);
75			v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
76			break;
77	greg	1.12	case VT_ANG: /* angular fisheye */
78			if (v->horiz > 360.0+FTINY)
79			return(ill_horiz);
80			if (v->vert > 360.0+FTINY)
81			return(ill_vert);
82	greg	2.9	v->hn2 = v->horiz * (PI/180.0);
83			v->vn2 = v->vert * (PI/180.0);
84	greg	1.12	break;
85			case VT_HEM: /* hemispherical fisheye */
86			if (v->horiz > 180.0+FTINY)
87			return(ill_horiz);
88			if (v->vert > 180.0+FTINY)
89			return(ill_vert);
90			v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0));
91			v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0));
92			break;
93	greg	2.34	case VT_PLS: /* planispheric fisheye */
94			if (v->horiz >= 360.0-FTINY)
95			return(ill_horiz);
96			if (v->vert >= 360.0-FTINY)
97			return(ill_vert);
98			v->hn2 = 2.sin(v->horiz(PI/180.0/2.0)) /
99			(1.0 + cos(v->horiz*(PI/180.0/2.0)));
100			v->vn2 = 2.sin(v->vert(PI/180.0/2.0)) /
101			(1.0 + cos(v->vert*(PI/180.0/2.0)));
102			break;
103	greg	1.12	default:
104	greg	1.1	return("unknown view type");
105	greg	1.12	}
106	greg	2.34	if (v->type != VT_ANG && v->type != VT_PLS) {
107	greg	2.9	if (v->type != VT_CYL) {
108			v->hvec[0] *= v->hn2;
109			v->hvec[1] *= v->hn2;
110			v->hvec[2] *= v->hn2;
111			}
112	greg	1.12	v->vvec[0] *= v->vn2;
113			v->vvec[1] *= v->vn2;
114			v->vvec[2] *= v->vn2;
115			}
116	greg	1.5	v->hn2 *= v->hn2;
117			v->vn2 *= v->vn2;
118	greg	1.1
119			return(NULL);
120			}
121
122
123	greg	2.16	void
124	greg	2.35	normaspect( /* fix pixel aspect or resolution */
125			double va, /* view aspect ratio */
126			double ap, / pixel aspect in (or out if 0) */
127			int *xp,
128			int yp / x and y resolution in (or out if ap!=0) /
129			)
130	greg	1.6	{
131			if (*ap <= FTINY)
132	greg	1.7	ap = va xp / yp; /* compute pixel aspect */
133	greg	1.6	else if (va * xp > ap * *yp)
134	greg	1.10	xp = yp / va * ap + .5; / reduce x resolution */
135	greg	1.6	else
136	greg	1.10	yp = xp * va / ap + .5; / reduce y resolution */
137	greg	1.6	}
138
139
140	greg	2.7	double
141	greg	2.35	viewray( /* compute ray origin and direction */
142			FVECT orig,
143			FVECT direc,
144			VIEW *v,
145			double x,
146			double y
147			)
148	greg	1.1	{
149	greg	1.12	double d, z;
150
151	greg	1.5	x += v->hoff - 0.5;
152			y += v->voff - 0.5;
153	greg	1.1
154	greg	1.12	switch(v->type) {
155			case VT_PAR: /* parallel view */
156	greg	2.7	orig[0] = v->vp[0] + v->vfore*v->vdir[0]
157			+ xv->hvec[0] + yv->vvec[0];
158			orig[1] = v->vp[1] + v->vfore*v->vdir[1]
159			+ xv->hvec[1] + yv->vvec[1];
160			orig[2] = v->vp[2] + v->vfore*v->vdir[2]
161			+ xv->hvec[2] + yv->vvec[2];
162	greg	1.1	VCOPY(direc, v->vdir);
163	greg	2.8	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
164	greg	1.12	case VT_PER: /* perspective view */
165	greg	1.5	direc[0] = v->vdir[0] + xv->hvec[0] + yv->vvec[0];
166			direc[1] = v->vdir[1] + xv->hvec[1] + yv->vvec[1];
167			direc[2] = v->vdir[2] + xv->hvec[2] + yv->vvec[2];
168	greg	2.40	VSUM(orig, v->vp, direc, v->vfore);
169	greg	2.7	d = normalize(direc);
170	greg	2.8	return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
171	greg	1.12	case VT_HEM: /* hemispherical fisheye */
172	greg	1.13	z = 1.0 - xxv->hn2 - yyv->vn2;
173	greg	1.12	if (z < 0.0)
174	greg	2.7	return(-1.0);
175	greg	1.12	z = sqrt(z);
176			direc[0] = zv->vdir[0] + xv->hvec[0] + y*v->vvec[0];
177			direc[1] = zv->vdir[1] + xv->hvec[1] + y*v->vvec[1];
178			direc[2] = zv->vdir[2] + xv->hvec[2] + y*v->vvec[2];
179	greg	2.40	VSUM(orig, v->vp, direc, v->vfore);
180	greg	2.8	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
181	greg	2.9	case VT_CYL: /* cylindrical panorama */
182			d = x * v->horiz * (PI/180.0);
183			z = cos(d);
184			x = sin(d);
185			direc[0] = zv->vdir[0] + xv->hvec[0] + y*v->vvec[0];
186			direc[1] = zv->vdir[1] + xv->hvec[1] + y*v->vvec[1];
187			direc[2] = zv->vdir[2] + xv->hvec[2] + y*v->vvec[2];
188	greg	2.40	VSUM(orig, v->vp, direc, v->vfore);
189	greg	2.9	d = normalize(direc);
190			return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
191	greg	1.12	case VT_ANG: /* angular fisheye */
192	greg	2.34	x = (1.0/180.0)v->horiz;
193			y = (1.0/180.0)v->vert;
194	greg	1.12	d = xx + yy;
195			if (d > 1.0)
196	greg	2.7	return(-1.0);
197	greg	1.12	d = sqrt(d);
198			z = cos(PI*d);
199	greg	2.34	d = d <= FTINY ? PI : sqrt(1.0 - z*z)/d;
200			x *= d;
201			y *= d;
202			direc[0] = zv->vdir[0] + xv->hvec[0] + y*v->vvec[0];
203			direc[1] = zv->vdir[1] + xv->hvec[1] + y*v->vvec[1];
204			direc[2] = zv->vdir[2] + xv->hvec[2] + y*v->vvec[2];
205	greg	2.40	VSUM(orig, v->vp, direc, v->vfore);
206	greg	2.34	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
207			case VT_PLS: /* planispheric fisheye */
208			x *= sqrt(v->hn2);
209			y *= sqrt(v->vn2);
210			d = xx + yy;
211			z = (1. - d)/(1. + d);
212	greg	2.38	x *= (1. + z);
213			y *= (1. + z);
214	greg	1.12	direc[0] = zv->vdir[0] + xv->hvec[0] + y*v->vvec[0];
215			direc[1] = zv->vdir[1] + xv->hvec[1] + y*v->vvec[1];
216			direc[2] = zv->vdir[2] + xv->hvec[2] + y*v->vvec[2];
217	greg	2.40	VSUM(orig, v->vp, direc, v->vfore);
218	greg	2.8	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
219	greg	1.1	}
220	greg	2.7	return(-1.0);
221	greg	1.1	}
222
223
224	greg	2.41	int
225	greg	2.35	viewloc( /* find image location for point */
226			FVECT ip,
227			VIEW *v,
228			FVECT p
229	greg	2.46	) /* Use VL_* flags to interpret return value */
230	greg	1.3	{
231	greg	2.46	int rflags = VL_GOOD;
232	gregl	2.13	double d, d2;
233	greg	1.3	FVECT disp;
234	greg	1.5
235	greg	2.34	VSUB(disp, p, v->vp);
236	greg	1.3
237	greg	1.12	switch (v->type) {
238			case VT_PAR: /* parallel view */
239	greg	2.7	ip[2] = DOT(disp,v->vdir) - v->vfore;
240	greg	1.13	break;
241	greg	1.12	case VT_PER: /* perspective view */
242	greg	1.11	d = DOT(disp,v->vdir);
243	greg	2.47	if ((v->vaft > FTINY) & (d >= v->vaft))
244	greg	2.46	rflags \|= VL_BEYOND;
245	gregl	2.13	ip[2] = VLEN(disp);
246	greg	2.42	if (d < -FTINY) { /* fold pyramid */
247	greg	1.17	ip[2] = -ip[2];
248	greg	1.11	d = -d;
249	greg	2.42	} else if (d <= FTINY)
250	greg	2.46	return(VL_BAD); /* at infinite edge */
251	greg	2.41	d = 1.0/d;
252			disp[0] *= d;
253			disp[1] *= d;
254			disp[2] *= d;
255	greg	2.42	if (ip[2] < 0.0) d = -d;
256	greg	2.7	ip[2] = (1.0 - v->vfored);
257	greg	1.13	break;
258	greg	1.12	case VT_HEM: /* hemispherical fisheye */
259			d = normalize(disp);
260	greg	1.17	if (DOT(disp,v->vdir) < 0.0)
261			ip[2] = -d;
262			else
263			ip[2] = d;
264	greg	2.7	ip[2] -= v->vfore;
265	greg	1.13	break;
266	greg	2.9	case VT_CYL: /* cylindrical panorama */
267			d = DOT(disp,v->hvec);
268	gregl	2.13	d2 = DOT(disp,v->vdir);
269			ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff;
270	greg	2.51	d2 = dd + d2d2;
271			if (d2 <= FTINY*FTINY)
272	greg	2.46	return(VL_BAD); /* at pole */
273	greg	2.51	if ((v->vaft > FTINY) & (d2 >= v->vaft*v->vaft))
274	greg	2.46	rflags \|= VL_BEYOND;
275	greg	2.51	d = 1.0/sqrt(d2);
276	gregl	2.13	ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff;
277			ip[2] = VLEN(disp);
278	gwlarson	2.15	ip[2] = (1.0 - v->vfored);
279	greg	2.42	goto gotall;
280	greg	1.12	case VT_ANG: /* angular fisheye */
281	greg	1.17	ip[0] = 0.5 - v->hoff;
282			ip[1] = 0.5 - v->voff;
283	greg	2.7	ip[2] = normalize(disp) - v->vfore;
284	greg	1.12	d = DOT(disp,v->vdir);
285			if (d >= 1.0-FTINY)
286	greg	2.42	goto gotall;
287	greg	1.12	if (d <= -(1.0-FTINY)) {
288	greg	2.7	ip[0] += 180.0/v->horiz;
289	greg	2.42	goto gotall;
290	greg	1.12	}
291	greg	2.34	d = (180.0/PI)acos(d) / sqrt(1.0 - dd);
292			ip[0] += DOT(disp,v->hvec)*d/v->horiz;
293			ip[1] += DOT(disp,v->vvec)*d/v->vert;
294	greg	2.42	goto gotall;
295	greg	2.34	case VT_PLS: /* planispheric fisheye */
296			ip[0] = 0.5 - v->hoff;
297			ip[1] = 0.5 - v->voff;
298			ip[2] = normalize(disp) - v->vfore;
299			d = DOT(disp,v->vdir);
300			if (d >= 1.0-FTINY)
301	greg	2.42	goto gotall;
302	greg	2.34	if (d <= -(1.0-FTINY))
303	greg	2.46	return(VL_BAD);
304	greg	2.38	ip[0] += DOT(disp,v->hvec)/((1. + d)*sqrt(v->hn2));
305			ip[1] += DOT(disp,v->vvec)/((1. + d)*sqrt(v->vn2));
306	greg	2.42	goto gotall;
307	greg	2.45	default:
308	greg	2.46	return(VL_BAD);
309	greg	1.3	}
310	greg	1.17	ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
311			ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
312	greg	2.46	gotall: /* add appropriate return flags */
313	greg	2.48	if (ip[2] <= 0.0)
314			rflags \|= VL_BEHIND;
315			else if ((v->type != VT_PER) & (v->type != VT_CYL))
316			rflags \|= VL_BEYOND*((v->vaft > FTINY) &
317			(ip[2] >= v->vaft - v->vfore));
318	greg	2.46	rflags \|= VL_OUTSIDE*((0.0 >= ip[0]) \| (ip[0] >= 1.0) \|
319			(0.0 >= ip[1]) \| (ip[1] >= 1.0));
320			return(rflags);
321	greg	1.3	}
322
323
324	greg	2.16	void
325	greg	2.35	pix2loc( /* compute image location from pixel pos. */
326			RREAL loc[2],
327			RESOLU *rp,
328			int px,
329			int py
330			)
331	greg	1.17	{
332	greg	2.36	int x, y;
333	greg	1.17
334	greg	2.16	if (rp->rt & YMAJOR) {
335	greg	1.17	x = px;
336			y = py;
337			} else {
338			x = py;
339			y = px;
340			}
341	greg	2.16	if (rp->rt & XDECR)
342	greg	1.17	x = rp->xr-1 - x;
343	greg	2.16	if (rp->rt & YDECR)
344	greg	1.17	y = rp->yr-1 - y;
345			loc[0] = (x+.5)/rp->xr;
346			loc[1] = (y+.5)/rp->yr;
347			}
348
349
350	greg	2.16	void
351	greg	2.35	loc2pix( /* compute pixel pos. from image location */
352			int pp[2],
353			RESOLU *rp,
354			double lx,
355			double ly
356			)
357	greg	1.17	{
358	greg	2.36	int x, y;
359	greg	1.17
360	greg	2.37	x = (int)(lx*rp->xr + .5 - (lx < 0.0));
361			y = (int)(ly*rp->yr + .5 - (ly < 0.0));
362
363	greg	2.16	if (rp->rt & XDECR)
364	greg	1.17	x = rp->xr-1 - x;
365	greg	2.16	if (rp->rt & YDECR)
366	greg	1.17	y = rp->yr-1 - y;
367	greg	2.16	if (rp->rt & YMAJOR) {
368	greg	1.17	pp[0] = x;
369			pp[1] = y;
370			} else {
371			pp[0] = y;
372			pp[1] = x;
373			}
374			}
375
376
377	greg	1.5	int
378	greg	2.35	getviewopt( /* process view argument */
379			VIEW *v,
380			int ac,
381			char *av[]
382			)
383	greg	1.5	{
384	greg	2.49	#define check(c,l) if ((av[0][c]&&!isspace(av[0][c])) \|\| \
385	greg	1.16	badarg(ac-1,av+1,l)) return(-1)
386	greg	1.5
387	greg	1.9	if (ac <= 0 \|\| av[0][0] != '-' \|\| av[0][1] != 'v')
388	greg	1.5	return(-1);
389			switch (av[0][2]) {
390			case 't': /* type */
391	greg	2.49	if (!av[0][3] \|\| isspace(av[0][3]))
392	greg	1.5	return(-1);
393	greg	1.16	check(4,"");
394	greg	1.5	v->type = av[0][3];
395			return(0);
396			case 'p': /* point */
397	greg	1.16	check(3,"fff");
398	greg	1.5	v->vp[0] = atof(av[1]);
399			v->vp[1] = atof(av[2]);
400			v->vp[2] = atof(av[3]);
401			return(3);
402			case 'd': /* direction */
403	greg	1.16	check(3,"fff");
404	greg	1.5	v->vdir[0] = atof(av[1]);
405			v->vdir[1] = atof(av[2]);
406			v->vdir[2] = atof(av[3]);
407	greg	2.30	v->vdist = 1.;
408	greg	1.5	return(3);
409			case 'u': /* up */
410	greg	1.16	check(3,"fff");
411	greg	1.5	v->vup[0] = atof(av[1]);
412			v->vup[1] = atof(av[2]);
413			v->vup[2] = atof(av[3]);
414			return(3);
415			case 'h': /* horizontal size */
416	greg	1.16	check(3,"f");
417	greg	1.5	v->horiz = atof(av[1]);
418			return(1);
419			case 'v': /* vertical size */
420	greg	1.16	check(3,"f");
421	greg	1.5	v->vert = atof(av[1]);
422			return(1);
423	greg	2.7	case 'o': /* fore clipping plane */
424			check(3,"f");
425			v->vfore = atof(av[1]);
426			return(1);
427			case 'a': /* aft clipping plane */
428			check(3,"f");
429			v->vaft = atof(av[1]);
430			return(1);
431	greg	1.5	case 's': /* shift */
432	greg	1.16	check(3,"f");
433	greg	1.5	v->hoff = atof(av[1]);
434			return(1);
435			case 'l': /* lift */
436	greg	1.16	check(3,"f");
437	greg	1.5	v->voff = atof(av[1]);
438			return(1);
439			default:
440			return(-1);
441			}
442			#undef check
443			}
444
445
446			int
447	greg	2.35	sscanview( /* get view parameters from string */
448			VIEW *vp,
449			char *s
450			)
451	greg	1.1	{
452	greg	1.5	int ac;
453			char *av[4];
454			int na;
455			int nvopts = 0;
456
457	greg	2.32	while (isspace(*s))
458			if (!*s++)
459			return(0);
460	greg	1.9	while (*s) {
461	greg	1.5	ac = 0;
462			do {
463	greg	2.21	if (ac \|\| *s == '-')
464			av[ac++] = s;
465	greg	2.32	while (s && !isspace(s))
466	greg	1.5	s++;
467	greg	2.32	while (isspace(*s))
468	greg	1.5	s++;
469			} while (*s && ac < 4);
470			if ((na = getviewopt(vp, ac, av)) >= 0) {
471			if (na+1 < ac)
472			s = av[na+1];
473			nvopts++;
474	greg	1.9	} else if (ac > 1)
475			s = av[1];
476			}
477	greg	1.5	return(nvopts);
478	greg	1.1	}
479
480
481	greg	2.16	void
482	greg	2.35	fprintview( /* write out view parameters */
483			VIEW *vp,
484			FILE *fp
485			)
486	greg	1.1	{
487			fprintf(fp, " -vt%c", vp->type);
488			fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
489	greg	2.29	fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist,
490			vp->vdir[1]*vp->vdist,
491			vp->vdir[2]*vp->vdist);
492	greg	1.1	fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
493			fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
494	greg	2.7	fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft);
495	greg	1.9	fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
496	greg	2.11	}
497
498
499			char *
500	greg	2.35	viewopt( /* translate to minimal view string */
501			VIEW *vp
502			)
503	greg	2.11	{
504			static char vwstr[128];
505	greg	2.36	char *cp = vwstr;
506	greg	2.11
507	greg	2.33	*cp = '\0';
508	greg	2.11	if (vp->type != stdview.type) {
509			sprintf(cp, " -vt%c", vp->type);
510			cp += strlen(cp);
511			}
512	greg	2.52	if (!VABSEQ(vp->vp,stdview.vp)) {
513	greg	2.11	sprintf(cp, " -vp %.6g %.6g %.6g",
514			vp->vp[0], vp->vp[1], vp->vp[2]);
515			cp += strlen(cp);
516			}
517	greg	2.52	if (!FABSEQ(vp->vdist,stdview.vdist) \|\| !VABSEQ(vp->vdir,stdview.vdir)) {
518	greg	2.11	sprintf(cp, " -vd %.6g %.6g %.6g",
519	greg	2.29	vp->vdir[0]*vp->vdist,
520			vp->vdir[1]*vp->vdist,
521			vp->vdir[2]*vp->vdist);
522	greg	2.11	cp += strlen(cp);
523			}
524	greg	2.52	if (!VABSEQ(vp->vup,stdview.vup)) {
525	greg	2.11	sprintf(cp, " -vu %.6g %.6g %.6g",
526			vp->vup[0], vp->vup[1], vp->vup[2]);
527			cp += strlen(cp);
528			}
529	greg	2.52	if (!FABSEQ(vp->horiz,stdview.horiz)) {
530	greg	2.11	sprintf(cp, " -vh %.6g", vp->horiz);
531			cp += strlen(cp);
532			}
533	greg	2.52	if (!FABSEQ(vp->vert,stdview.vert)) {
534	greg	2.11	sprintf(cp, " -vv %.6g", vp->vert);
535			cp += strlen(cp);
536			}
537	greg	2.52	if (!FABSEQ(vp->vfore,stdview.vfore)) {
538	greg	2.11	sprintf(cp, " -vo %.6g", vp->vfore);
539			cp += strlen(cp);
540			}
541	greg	2.52	if (!FABSEQ(vp->vaft,stdview.vaft)) {
542	greg	2.11	sprintf(cp, " -va %.6g", vp->vaft);
543			cp += strlen(cp);
544			}
545	greg	2.52	if (!FABSEQ(vp->hoff,stdview.hoff)) {
546	greg	2.11	sprintf(cp, " -vs %.6g", vp->hoff);
547			cp += strlen(cp);
548			}
549	greg	2.52	if (!FABSEQ(vp->voff,stdview.voff)) {
550	greg	2.11	sprintf(cp, " -vl %.6g", vp->voff);
551			cp += strlen(cp);
552			}
553			return(vwstr);
554	greg	1.1	}
555
556
557	greg	2.3	int
558	greg	2.35	isview( /* is this a view string? */
559			char *s
560			)
561	greg	2.3	{
562	greg	2.25	static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL};
563	greg	2.5	extern char *progname;
564	greg	2.36	char *cp;
565			char **an;
566	greg	2.3	/* add program name to list */
567	greg	2.5	if (altname[0] == NULL) {
568			for (cp = progname; *cp; cp++)
569			;
570			while (cp > progname && !ISDIRSEP(cp[-1]))
571			cp--;
572			altname[0] = cp;
573			}
574	greg	2.3	/* skip leading path */
575			cp = s;
576	greg	2.49	while (cp && !isspace(cp))
577	greg	2.3	cp++;
578	greg	2.5	while (cp > s && !ISDIRSEP(cp[-1]))
579	greg	2.3	cp--;
580			for (an = altname; *an != NULL; an++)
581			if (!strncmp(an, cp, strlen(an)))
582			return(1);
583			return(0);
584			}
585	greg	1.1
586	greg	2.3
587	greg	1.15	struct myview {
588			VIEW *hv;
589			int ok;
590			};
591	greg	1.1
592	greg	1.15
593	gwlarson	2.14	static int
594	schorsch	2.26	gethview( /* get view from header */
595			char *s,
596			void *v
597			)
598	greg	1.1	{
599	schorsch	2.26	if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0)
600			((struct myview*)v)->ok++;
601	gwlarson	2.14	return(0);
602	greg	1.1	}
603
604
605			int
606	greg	2.35	viewfile( /* get view from file */
607			char *fname,
608			VIEW *vp,
609			RESOLU *rp
610			)
611	greg	1.1	{
612	greg	1.15	struct myview mvs;
613	greg	1.1	FILE *fp;
614
615	greg	2.16	if (fname == NULL \|\| !strcmp(fname, "-"))
616			fp = stdin;
617			else if ((fp = fopen(fname, "r")) == NULL)
618	greg	1.1	return(-1);
619
620	greg	1.15	mvs.hv = vp;
621			mvs.ok = 0;
622	greg	1.1
623	schorsch	2.26	getheader(fp, gethview, &mvs);
624	greg	1.8
625	greg	1.17	if (rp != NULL && !fgetsresolu(rp, fp))
626	greg	1.15	mvs.ok = 0;
627	greg	1.1
628	greg	2.50	if (fp != stdin)
629			fclose(fp);
630	greg	1.1
631	greg	1.15	return(mvs.ok);
632	greg	1.1	}