src/px/pcomb.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  Combine picture files according to calcomp functions.
 *
 *      1/4/89
 */

#include "standard.h"

#include "color.h"

#include "resolu.h"

#include "calcomp.h"

#include "view.h"

#define MAXINP          32              /* maximum number of input files */
#define WINSIZ          17              /* scanline window size */
#define MIDSCN          ((WINSIZ-1)/2+1)

struct {
        char    *name;          /* file or command name */
        FILE    *fp;            /* stream pointer */
        VIEW    vw;             /* view for picture */
        RESOLU  rs;             /* image resolution and orientation */
        float   pa;             /* pixel aspect ratio */
        COLOR   *scan[WINSIZ];  /* input scanline window */
        COLOR   coef;           /* coefficient */
        COLOR   expos;          /* recorded exposure */
}       input[MAXINP];                  /* input pictures */

int     nfiles;                         /* number of input files */

char    ourfmt[LPICFMT+1] = PICFMT;     /* input picture format */

char    Command[] = "<Command>";
char    vcolin[3][4] = {"ri", "gi", "bi"};
char    vcolout[3][4] = {"ro", "go", "bo"};
char    vbrtin[] = "li";
char    vbrtout[] = "lo";
char    vcolexp[3][4] = {"re", "ge", "be"};
char    vbrtexp[] = "le";
char    vpixaspect[] = "pa";

char    vray[7][4] = {"Ox", "Oy", "Oz", "Dx", "Dy", "Dz", "T"};

char    vpsize[] = "S";

char    vnfiles[] = "nfiles";
char    vwhteff[] = "WE";
char    vxmax[] = "xmax";
char    vymax[] = "ymax";
char    vxres[] = "xres";
char    vyres[] = "yres";
char    vxpos[] = "x";
char    vypos[] = "y";

int     nowarn = 0;                     /* no warning messages? */

int     xmax = 0, ymax = 0;             /* input resolution */

int     xscan, yscan;                   /* input position */

int     xres, yres;                     /* output resolution */

int     xpos, ypos;                     /* output position */

char    *progname;                      /* global argv[0] */

int     wrongformat = 0;
int     gotview;

FILE    *popen();

extern char     *emalloc();


main(argc, argv)
int     argc;
char    *argv[];
{
        int     original;
        double  f;
        int     a, i;
#ifdef MSDOS
        extern int  _fmode;
        _fmode = O_BINARY;
        setmode(fileno(stdin), O_BINARY);
        setmode(fileno(stdout), O_BINARY);
#endif
        progname = argv[0];
                                                /* scan options */
        for (a = 1; a < argc; a++) {
                if (argv[a][0] == '-')
                        switch (argv[a][1]) {
                        case 'x':
                        case 'y':
                                a++;
                                continue;
                        case 'w':
                                nowarn = !nowarn;
                                continue;
                        case 'f':
                        case 'e':
                                a++;
                                continue;
                        }
                break;
        }
        newheader("RADIANCE", stdout);  /* start header */
                                        /* process files */
        for (nfiles = 0; nfiles < MAXINP; nfiles++) {
                setcolor(input[nfiles].coef, 1.0, 1.0, 1.0);
                setcolor(input[nfiles].expos, 1.0, 1.0, 1.0);
                copystruct(&input[nfiles].vw, &stdview);
                input[nfiles].pa = 1.0;
        }
        nfiles = 0;
        original = 0;
        for ( ; a < argc; a++) {
                if (nfiles >= MAXINP) {
                        eputs(argv[0]);
                        eputs(": too many picture files\n");
                        quit(1);
                }
                if (argv[a][0] == '-')
                        switch (argv[a][1]) {
                        case '\0':
                                input[nfiles].name = "<stdin>";
                                input[nfiles].fp = stdin;
                                break;
                        case 'o':
                                original++;
                                continue;
                        case 's':
                                f = atof(argv[++a]);
                                scalecolor(input[nfiles].coef, f);
                                continue;
                        case 'c':
                                colval(input[nfiles].coef,RED)*=atof(argv[++a]);
                                colval(input[nfiles].coef,GRN)*=atof(argv[++a]);
                                colval(input[nfiles].coef,BLU)*=atof(argv[++a]);
                                continue;
                        default:
                                goto usage;
                        }
                else {
                        if (argv[a][0] == '!') {
                                input[nfiles].name = Command;
                                input[nfiles].fp = popen(argv[a]+1, "r");
                        } else {
                                input[nfiles].name = argv[a];
                                input[nfiles].fp = fopen(argv[a], "r");
                        }
                        if (input[nfiles].fp == NULL) {
                                perror(argv[a]);
                                quit(1);
                        }
                }
                checkfile();
                if (original) {
                        colval(input[nfiles].coef,RED) /=
                                        colval(input[nfiles].expos,RED);
                        colval(input[nfiles].coef,GRN) /=
                                        colval(input[nfiles].expos,GRN);
                        colval(input[nfiles].coef,BLU) /=
                                        colval(input[nfiles].expos,BLU);
                }
                nfiles++;
                original = 0;
        }
        init();                         /* set constants */
                                        /* go back and get expressions */
        for (a = 1; a < argc; a++) {
                if (argv[a][0] == '-')
                        switch (argv[a][1]) {
                        case 'x':
                                varset(vxres, ':', eval(argv[++a]));
                                continue;
                        case 'y':
                                varset(vyres, ':', eval(argv[++a]));
                                continue;
                        case 'w':
                                continue;
                        case 'f':
                                fcompile(argv[++a]);
                                continue;
                        case 'e':
                                scompile(argv[++a], NULL, 0);
                                continue;
                        }
                break;
        }
                                                /* set/get output resolution */
        if (!vardefined(vxres))
                varset(vxres, ':', (double)xmax);
        if (!vardefined(vyres))
                varset(vyres, ':', (double)ymax);
        xres = varvalue(vxres) + .5;
        yres = varvalue(vyres) + .5;
        if (xres <= 0 || yres <= 0) {
                eputs(argv[0]);
                eputs(": illegal output resolution\n");
                quit(1);
        }
                                                /* complete header */
        printargs(argc, argv, stdout);
        if (strcmp(ourfmt, PICFMT))
                fputformat(ourfmt, stdout);     /* print format if known */
        putchar('\n');
        fprtresolu(xres, yres, stdout);
                                                /* combine pictures */
        combine();
        quit(0);
usage:
        eputs("Usage: ");
        eputs(argv[0]);
        eputs(
" [-w][-x xr][-y yr][-e expr][-f file] [ [-o][-s f][-c r g b] pic ..]\n");
        quit(1);
}


tputs(s)                        /* put out string preceded by a tab */
char    *s;
{
        char    fmt[32];
        double  d;
        COLOR   ctmp;

        if (isheadid(s))                        /* header id */
                return;         /* don't echo */
        if (formatval(fmt, s)) {                /* check format */
                if (globmatch(ourfmt, fmt)) {
                        wrongformat = 0;
                        strcpy(ourfmt, fmt);
                } else
                        wrongformat = 1;
                return;         /* don't echo */
        }
        if (isexpos(s)) {                       /* exposure */
                d = exposval(s);
                scalecolor(input[nfiles].expos, d);
        } else if (iscolcor(s)) {               /* color correction */
                colcorval(ctmp, s);
                multcolor(input[nfiles].expos, ctmp);
        } else if (isaspect(s))
                input[nfiles].pa *= aspectval(s);
        else if (isview(s) && sscanview(&input[nfiles].vw, s) > 0)
                gotview++;
                                                /* echo line */
        putchar('\t');
        fputs(s, stdout);
}


checkfile()                     /* ready a file */
{
        register int    i;
                                        /* process header */
        gotview = 0;
        fputs(input[nfiles].name, stdout);
        fputs(":\n", stdout);
        getheader(input[nfiles].fp, tputs, NULL);
        if (wrongformat) {
                eputs(input[nfiles].name);
                eputs(": not in Radiance picture format\n");
                quit(1);
        }
        if (!gotview || setview(&input[nfiles].vw) != NULL)
                input[nfiles].vw.type = 0;
        if (!fgetsresolu(&input[nfiles].rs, input[nfiles].fp)) {
                eputs(input[nfiles].name);
                eputs(": bad picture size\n");
                quit(1);
        }
        if (xmax == 0 && ymax == 0) {
                xmax = scanlen(&input[nfiles].rs);
                ymax = numscans(&input[nfiles].rs);
        } else if (scanlen(&input[nfiles].rs) != xmax ||
                        numscans(&input[nfiles].rs) != ymax) {
                eputs(input[nfiles].name);
                eputs(": resolution mismatch\n");
                quit(1);
        }
                                        /* allocate scanlines */
        for (i = 0; i < WINSIZ; i++)
                input[nfiles].scan[i] = (COLOR *)emalloc(xmax*sizeof(COLOR));
}


double
rgb_bright(clr)
COLOR  clr;
{
        return(bright(clr));
}


double
xyz_bright(clr)
COLOR  clr;
{
        return(clr[CIEY]);
}


double  (*ourbright)() = rgb_bright;


init()                                  /* perform final setup */
{
        double  l_colin(), l_expos(), l_pixaspect(), l_ray(), l_psize();
        register int    i;
                                                /* define constants */
        varset("PI", ':', PI);
        varset(vnfiles, ':', (double)nfiles);
        varset(vxmax, ':', (double)xmax);
        varset(vymax, ':', (double)ymax);
                                                /* set functions */
        for (i = 0; i < 3; i++) {
                funset(vcolexp[i], 1, ':', l_expos);
                funset(vcolin[i], 1, '=', l_colin);
        }
        funset(vbrtexp, 1, ':', l_expos);
        funset(vbrtin, 1, '=', l_colin);
        funset(vpixaspect, 1, ':', l_pixaspect);
        for (i = 0; i < 7; i++)
                funset(vray[i], 1, '=', l_ray);
        funset(vpsize, 1, '=', l_psize);
                                                /* set brightness function */
        if (!strcmp(ourfmt, CIEFMT)) {
                varset(vwhteff, ':', 1.0);
                ourbright = xyz_bright;
        } else
                varset(vwhteff, ':', WHTEFFICACY);
}


combine()                       /* combine pictures */
{
        EPNODE  *coldef[3], *brtdef;
        COLOR   *scanout;
        double  d;
        register int    i, j;
                                                /* check defined variables */
        for (j = 0; j < 3; j++) {
                if (vardefined(vcolout[j]))
                        coldef[j] = eparse(vcolout[j]);
                else
                        coldef[j] = NULL;
        }
        if (vardefined(vbrtout))
                brtdef = eparse(vbrtout);
        else
                brtdef = NULL;
                                                /* allocate scanline */
        scanout = (COLOR *)emalloc(xres*sizeof(COLOR));
                                                /* set input position */
        yscan = ymax+MIDSCN;
                                                /* combine files */
        for (ypos = yres-1; ypos >= 0; ypos--) {
            advance();
            varset(vypos, '=', (double)ypos);
            for (xpos = 0; xpos < xres; xpos++) {
                xscan = (long)xpos*xmax/xres;
                varset(vxpos, '=', (double)xpos);
                eclock++;
                if (brtdef != NULL) {
                    d = evalue(brtdef);
                    if (d < 0.0)
                        d = 0.0;
                    setcolor(scanout[xpos], d, d, d);
                } else {
                    for (j = 0; j < 3; j++) {
                        if (coldef[j] != NULL) {
                                d = evalue(coldef[j]);
                        } else {
                            d = 0.0;
                            for (i = 0; i < nfiles; i++)
                                d += colval(input[i].scan[MIDSCN][xscan],j);
                        }
                        if (d < 0.0)
                            d = 0.0;
                        colval(scanout[xpos],j) = d;
                    }
                }
            }
            if (fwritescan(scanout, xres, stdout) < 0) {
                    perror("write error");
                    quit(1);
            }
        }
        efree(scanout);
}


advance()                       /* read in data for next scanline */
{
        int     ytarget;
        register COLOR  *st;
        register int    i, j;

        for (ytarget = (long)ypos*ymax/yres; yscan > ytarget; yscan--)
                for (i = 0; i < nfiles; i++) {
                        st = input[i].scan[WINSIZ-1];
                        for (j = WINSIZ-1; j > 0; j--)  /* rotate window */
                                input[i].scan[j] = input[i].scan[j-1];
                        input[i].scan[0] = st;
                        if (yscan <= MIDSCN)            /* hit bottom? */
                                continue;
                        if (freadscan(st, xmax, input[i].fp) < 0) {  /* read */
                                eputs(input[i].name);
                                eputs(": read error\n");
                                quit(1);
                        }
                        if (fabs(colval(input[i].coef,RED)-1.0) > 1e-3 ||
                                fabs(colval(input[i].coef,GRN)-1.0) > 1e-3 ||
                                fabs(colval(input[i].coef,BLU)-1.0) > 1e-3)
                                for (j = 0; j < xmax; j++)  /* adjust color */
                                        multcolor(st[j], input[i].coef);
                }
}


double
l_expos(nam)                    /* return picture exposure */
register char   *nam;
{
        register int    fn, n;

        fn = argument(1) - .5;
        if (fn < 0 || fn >= nfiles)
                return(1.0);
        if (nam == vbrtexp)
                return((*ourbright)(input[fn].expos));
        n = 3;
        while (n--)
                if (nam == vcolexp[n])
                        return(colval(input[fn].expos,n));
        eputs("Bad call to l_expos()!\n");
        quit(1);
}


double
l_pixaspect()                   /* return pixel aspect ratio */
{
        register int    fn;

        fn = argument(1) - .5;
        if (fn < 0 || fn >= nfiles)
                return(1.0);
        return(input[fn].pa);
}


double
l_colin(nam)                    /* return color value for picture */
register char   *nam;
{
        int     fn;
        register int    n, xoff, yoff;
        double  d;

        fn = argument(1) - .5;
        if (fn < 0 || fn >= nfiles) {
                errno = EDOM;
                return(0.0);
        }
        xoff = yoff = 0;
        n = nargum();
        if (n >= 2) {
                d = argument(2);
                if (d < 0.0) {
                        xoff = d-.5;
                        if (xscan+xoff < 0)
                                xoff = -xscan;
                } else {
                        xoff = d+.5;
                        if (xscan+xoff >= xmax)
                                xoff = xmax-1-xscan;
                }
        }
        if (n >= 3) {
                d = argument(3);
                if (d < 0.0) {
                        yoff = d-.5;
                        if (yoff+MIDSCN < 0)
                                yoff = -MIDSCN;
                        if (yscan+yoff < 0)
                                yoff = -yscan;
                } else {
                        yoff = d+.5;
                        if (yoff+MIDSCN >= WINSIZ)
                                yoff = WINSIZ-1-MIDSCN;
                        if (yscan+yoff >= ymax)
                                yoff = ymax-1-yscan;
                }
        }
        if (nam == vbrtin)
                return((*ourbright)(input[fn].scan[MIDSCN+yoff][xscan+xoff]));
        n = 3;
        while (n--)
            if (nam == vcolin[n])
                return(colval(input[fn].scan[MIDSCN+yoff][xscan+xoff],n));
        eputs("Bad call to l_colin()!\n");
        quit(1);
}


double
l_ray(nam)              /* return ray origin or direction */
register char   *nam;
{
        static unsigned long    ltick[MAXINP];
        static FVECT    lorg[MAXINP], ldir[MAXINP];
        static double   ldist[MAXINP];
        FLOAT   loc[2];
        int     fn;
        register int    i;

        fn = argument(1) - .5;
        if (fn < 0 || fn >= nfiles) {
                errno = EDOM;
                return(0.0);
        }
        if (ltick[fn] < eclock) {               /* need to compute? */
                lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0;
                ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0;
                if (input[fn].vw.type == 0)
                        errno = EDOM;
                else {
                        pix2loc(loc, &input[fn].rs, xscan, ymax-1-yscan);
                        ldist[fn] = viewray(lorg[fn], ldir[fn],
                                        &input[fn].vw, loc[0], loc[1]);
                }
                ltick[fn] = eclock;
        }
        if (nam == vray[i=6])
                return(ldist[fn]);
        while (i--)
                if (nam == vray[i])
                        return(i < 3 ? lorg[fn][i] : ldir[fn][i-3]);
        eputs("Bad call to l_ray()!\n");
        quit(1);
}


double
l_psize()                       /* compute pixel size in steradians */
{
        static unsigned long    ltick[MAXINP];
        static double   psize[MAXINP];
        FVECT   dir0, org, dirx, diry;
        FLOAT   locx[2], locy[2];
        double  d;
        int     fn;
        register int    i;

        d = argument(1);
        if (d < .5 || d >= nfiles+.5) {
                errno = EDOM;
                return(0.0);
        }
        fn = d - .5;
        if (ltick[fn] < eclock) {               /* need to compute? */
                psize[fn] = 0.0;
                if (input[fn].vw.type == 0)
                        errno = EDOM;
                else if (input[fn].vw.type != VT_PAR &&
                                funvalue(vray[6], 1, &d) >= 0) {
                        for (i = 0; i < 3; i++)
                                dir0[i] = funvalue(vray[3+i], 1, &d);
                        pix2loc(locx, &input[fn].rs, xscan+1, ymax-1-yscan);
                        pix2loc(locy, &input[fn].rs, xscan, ymax-yscan);
                        if (viewray(org, dirx, &input[fn].vw,
                                        locx[0], locx[1]) >= 0 &&
                                        viewray(org, diry, &input[fn].vw,
                                        locy[0], locy[1]) >= 0) {
                                                /* approximate solid angle */
                                for (i = 0; i < 3; i++) {
                                        dirx[i] -= dir0[i];
                                        diry[i] -= dir0[i];
                                }
                                fcross(dir0, dirx, diry);
                                psize[fn] = 0.5 * sqrt(DOT(dir0,dir0));
                        }
                }
                ltick[fn] = eclock;
        }
        return(psize[fn]);
}


wputs(msg)
char    *msg;
{
        if (!nowarn)
                eputs(msg);
}


eputs(msg)
char    *msg;
{
        fputs(msg, stderr);
}


quit(code)              /* exit gracefully */
int  code;
{
        register int  i;
                                /* close input files */
        for (i = 0; i < nfiles; i++)
                if (input[i].name == Command)
                        pclose(input[i].fp);
                else
                        fclose(input[i].fp);
        exit(code);
}
Revision:	2.19
Committed:	Thu Sep 5 10:38:53 1996 UTC (29 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.18:	+1 -0 lines
Log Message:	added definition of constant PI
#	User	Rev	Content
1	greg	2.6	/* Copyright (c) 1992 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Combine picture files according to calcomp functions.
9			*
10			* 1/4/89
11			*/
12
13	greg	2.10	#include "standard.h"
14	greg	1.1
15			#include "color.h"
16
17	greg	2.8	#include "resolu.h"
18	greg	1.23
19	greg	1.1	#include "calcomp.h"
20
21	greg	2.10	#include "view.h"
22
23	greg	1.6	#define MAXINP 32 /* maximum number of input files */
24	greg	2.13	#define WINSIZ 17 /* scanline window size */
25			#define MIDSCN ((WINSIZ-1)/2+1)
26	greg	1.1
27			struct {
28	greg	1.19	char name; / file or command name */
29	greg	1.1	FILE fp; / stream pointer */
30	greg	2.10	VIEW vw; /* view for picture */
31			RESOLU rs; /* image resolution and orientation */
32	greg	2.17	float pa; /* pixel aspect ratio */
33	greg	1.14	COLOR scan[WINSIZ]; / input scanline window */
34	greg	1.3	COLOR coef; /* coefficient */
35	greg	1.17	COLOR expos; /* recorded exposure */
36	greg	1.1	} input[MAXINP]; /* input pictures */
37
38			int nfiles; /* number of input files */
39
40	greg	2.16	char ourfmt[LPICFMT+1] = PICFMT; /* input picture format */
41
42	greg	2.6	char Command[] = "<Command>";
43	greg	1.21	char vcolin[3][4] = {"ri", "gi", "bi"};
44			char vcolout[3][4] = {"ro", "go", "bo"};
45	greg	1.15	char vbrtin[] = "li";
46			char vbrtout[] = "lo";
47	greg	1.21	char vcolexp[3][4] = {"re", "ge", "be"};
48	greg	1.17	char vbrtexp[] = "le";
49	greg	2.18	char vpixaspect[] = "pa";
50	greg	1.1
51	greg	2.18	char vray[7][4] = {"Ox", "Oy", "Oz", "Dx", "Dy", "Dz", "T"};
52	greg	2.10
53	greg	2.17	char vpsize[] = "S";
54
55	greg	1.18	char vnfiles[] = "nfiles";
56	greg	2.18	char vwhteff[] = "WE";
57	greg	1.18	char vxmax[] = "xmax";
58			char vymax[] = "ymax";
59			char vxres[] = "xres";
60			char vyres[] = "yres";
61			char vxpos[] = "x";
62			char vypos[] = "y";
63	greg	1.1
64			int nowarn = 0; /* no warning messages? */
65
66	greg	1.18	int xmax = 0, ymax = 0; /* input resolution */
67	greg	1.9
68	greg	1.18	int xscan, yscan; /* input position */
69	greg	1.1
70	greg	1.18	int xres, yres; /* output resolution */
71	greg	1.1
72	greg	1.18	int xpos, ypos; /* output position */
73
74	greg	2.10	char progname; / global argv[0] */
75
76	greg	1.10	int wrongformat = 0;
77	greg	2.10	int gotview;
78	greg	1.1
79	greg	1.19	FILE *popen();
80	greg	1.10
81	greg	2.7	extern char *emalloc();
82	greg	1.19
83	greg	2.7
84	greg	1.1	main(argc, argv)
85			int argc;
86			char *argv[];
87			{
88	greg	1.18	int original;
89	greg	1.3	double f;
90	greg	1.14	int a, i;
91	greg	2.7	#ifdef MSDOS
92			extern int _fmode;
93			_fmode = O_BINARY;
94			setmode(fileno(stdin), O_BINARY);
95			setmode(fileno(stdout), O_BINARY);
96			#endif
97	greg	2.10	progname = argv[0];
98	greg	1.15	/* scan options */
99			for (a = 1; a < argc; a++) {
100	greg	1.1	if (argv[a][0] == '-')
101			switch (argv[a][1]) {
102			case 'x':
103			case 'y':
104	greg	1.18	a++;
105	greg	1.15	continue;
106	greg	1.1	case 'w':
107			nowarn = !nowarn;
108	greg	1.15	continue;
109	greg	1.1	case 'f':
110			case 'e':
111	greg	1.16	a++;
112	greg	1.15	continue;
113	greg	1.1	}
114	greg	1.15	break;
115			}
116	greg	2.14	newheader("RADIANCE", stdout); /* start header */
117	greg	1.15	/* process files */
118	greg	1.17	for (nfiles = 0; nfiles < MAXINP; nfiles++) {
119	greg	1.3	setcolor(input[nfiles].coef, 1.0, 1.0, 1.0);
120	greg	1.17	setcolor(input[nfiles].expos, 1.0, 1.0, 1.0);
121	greg	2.10	copystruct(&input[nfiles].vw, &stdview);
122	greg	2.17	input[nfiles].pa = 1.0;
123	greg	1.17	}
124	greg	1.1	nfiles = 0;
125	greg	1.18	original = 0;
126	greg	1.1	for ( ; a < argc; a++) {
127			if (nfiles >= MAXINP) {
128			eputs(argv[0]);
129			eputs(": too many picture files\n");
130			quit(1);
131			}
132	greg	1.3	if (argv[a][0] == '-')
133			switch (argv[a][1]) {
134			case '\0':
135			input[nfiles].name = "<stdin>";
136			input[nfiles].fp = stdin;
137			break;
138	greg	1.17	case 'o':
139			original++;
140	greg	1.22	continue;
141	greg	1.3	case 's':
142			f = atof(argv[++a]);
143			scalecolor(input[nfiles].coef, f);
144			continue;
145			case 'c':
146			colval(input[nfiles].coef,RED)*=atof(argv[++a]);
147			colval(input[nfiles].coef,GRN)*=atof(argv[++a]);
148			colval(input[nfiles].coef,BLU)*=atof(argv[++a]);
149			continue;
150			default:
151			goto usage;
152			}
153			else {
154	greg	2.2	if (argv[a][0] == '!') {
155	greg	2.6	input[nfiles].name = Command;
156	greg	2.2	input[nfiles].fp = popen(argv[a]+1, "r");
157			} else {
158			input[nfiles].name = argv[a];
159			input[nfiles].fp = fopen(argv[a], "r");
160			}
161	greg	1.1	if (input[nfiles].fp == NULL) {
162	greg	1.6	perror(argv[a]);
163	greg	1.1	quit(1);
164			}
165			}
166	greg	1.16	checkfile();
167	greg	1.18	if (original) {
168			colval(input[nfiles].coef,RED) /=
169			colval(input[nfiles].expos,RED);
170			colval(input[nfiles].coef,GRN) /=
171			colval(input[nfiles].expos,GRN);
172			colval(input[nfiles].coef,BLU) /=
173			colval(input[nfiles].expos,BLU);
174			}
175			nfiles++;
176	greg	1.17	original = 0;
177	greg	1.15	}
178	greg	1.18	init(); /* set constants */
179	greg	1.15	/* go back and get expressions */
180			for (a = 1; a < argc; a++) {
181			if (argv[a][0] == '-')
182			switch (argv[a][1]) {
183			case 'x':
184	greg	1.21	varset(vxres, ':', eval(argv[++a]));
185	greg	1.18	continue;
186	greg	1.15	case 'y':
187	greg	1.21	varset(vyres, ':', eval(argv[++a]));
188	greg	1.16	continue;
189	greg	1.15	case 'w':
190			continue;
191			case 'f':
192			fcompile(argv[++a]);
193			continue;
194			case 'e':
195			scompile(argv[++a], NULL, 0);
196			continue;
197			}
198			break;
199			}
200	greg	1.18	/* set/get output resolution */
201			if (!vardefined(vxres))
202			varset(vxres, ':', (double)xmax);
203			if (!vardefined(vyres))
204			varset(vyres, ':', (double)ymax);
205			xres = varvalue(vxres) + .5;
206			yres = varvalue(vyres) + .5;
207			if (xres <= 0 \|\| yres <= 0) {
208			eputs(argv[0]);
209			eputs(": illegal output resolution\n");
210			quit(1);
211			}
212	greg	1.15	/* complete header */
213			printargs(argc, argv, stdout);
214	greg	2.16	if (strcmp(ourfmt, PICFMT))
215			fputformat(ourfmt, stdout); /* print format if known */
216	greg	1.15	putchar('\n');
217	greg	1.23	fprtresolu(xres, yres, stdout);
218	greg	1.15	/* combine pictures */
219			combine();
220			quit(0);
221			usage:
222			eputs("Usage: ");
223			eputs(argv[0]);
224			eputs(
225	greg	2.9	" [-w][-x xr][-y yr][-e expr][-f file] [ [-o][-s f][-c r g b] pic ..]\n");
226	greg	1.15	quit(1);
227			}
228
229
230			tputs(s) /* put out string preceded by a tab */
231			char *s;
232			{
233			char fmt[32];
234			double d;
235			COLOR ctmp;
236
237	greg	2.14	if (isheadid(s)) /* header id */
238			return; /* don't echo */
239			if (formatval(fmt, s)) { /* check format */
240	greg	2.16	if (globmatch(ourfmt, fmt)) {
241			wrongformat = 0;
242			strcpy(ourfmt, fmt);
243			} else
244			wrongformat = 1;
245	greg	1.17	return; /* don't echo */
246			}
247			if (isexpos(s)) { /* exposure */
248			d = exposval(s);
249			scalecolor(input[nfiles].expos, d);
250			} else if (iscolcor(s)) { /* color correction */
251	greg	1.15	colcorval(ctmp, s);
252	greg	1.17	multcolor(input[nfiles].expos, ctmp);
253	greg	2.18	} else if (isaspect(s))
254	greg	2.17	input[nfiles].pa *= aspectval(s);
255	greg	2.18	else if (isview(s) && sscanview(&input[nfiles].vw, s) > 0)
256	greg	2.10	gotview++;
257	greg	1.17	/* echo line */
258			putchar('\t');
259			fputs(s, stdout);
260	greg	1.16	}
261	greg	1.15
262	greg	1.16
263			checkfile() /* ready a file */
264			{
265			register int i;
266			/* process header */
267	greg	2.10	gotview = 0;
268	greg	1.16	fputs(input[nfiles].name, stdout);
269			fputs(":\n", stdout);
270			getheader(input[nfiles].fp, tputs, NULL);
271			if (wrongformat) {
272			eputs(input[nfiles].name);
273			eputs(": not in Radiance picture format\n");
274			quit(1);
275			}
276	greg	2.10	if (!gotview \|\| setview(&input[nfiles].vw) != NULL)
277			input[nfiles].vw.type = 0;
278			if (!fgetsresolu(&input[nfiles].rs, input[nfiles].fp)) {
279	greg	1.16	eputs(input[nfiles].name);
280			eputs(": bad picture size\n");
281			quit(1);
282			}
283	greg	1.18	if (xmax == 0 && ymax == 0) {
284	greg	2.10	xmax = scanlen(&input[nfiles].rs);
285			ymax = numscans(&input[nfiles].rs);
286			} else if (scanlen(&input[nfiles].rs) != xmax \|\|
287			numscans(&input[nfiles].rs) != ymax) {
288	greg	1.16	eputs(input[nfiles].name);
289			eputs(": resolution mismatch\n");
290			quit(1);
291			}
292			/* allocate scanlines */
293			for (i = 0; i < WINSIZ; i++)
294	greg	1.18	input[nfiles].scan[i] = (COLOR )emalloc(xmaxsizeof(COLOR));
295	greg	1.15	}
296
297
298	greg	2.16	double
299			rgb_bright(clr)
300			COLOR clr;
301			{
302			return(bright(clr));
303			}
304
305
306			double
307			xyz_bright(clr)
308			COLOR clr;
309			{
310			return(clr[CIEY]);
311			}
312
313
314			double (*ourbright)() = rgb_bright;
315
316
317	greg	1.18	init() /* perform final setup */
318	greg	1.15	{
319	greg	2.18	double l_colin(), l_expos(), l_pixaspect(), l_ray(), l_psize();
320	greg	1.16	register int i;
321	greg	1.15	/* define constants */
322	greg	2.19	varset("PI", ':', PI);
323	greg	1.15	varset(vnfiles, ':', (double)nfiles);
324	greg	1.18	varset(vxmax, ':', (double)xmax);
325			varset(vymax, ':', (double)ymax);
326	greg	1.15	/* set functions */
327			for (i = 0; i < 3; i++) {
328	greg	1.17	funset(vcolexp[i], 1, ':', l_expos);
329	greg	1.15	funset(vcolin[i], 1, '=', l_colin);
330			}
331	greg	1.17	funset(vbrtexp, 1, ':', l_expos);
332	greg	1.15	funset(vbrtin, 1, '=', l_colin);
333	greg	2.18	funset(vpixaspect, 1, ':', l_pixaspect);
334			for (i = 0; i < 7; i++)
335	greg	2.10	funset(vray[i], 1, '=', l_ray);
336	greg	2.17	funset(vpsize, 1, '=', l_psize);
337	greg	2.16	/* set brightness function */
338	greg	2.18	if (!strcmp(ourfmt, CIEFMT)) {
339			varset(vwhteff, ':', 1.0);
340	greg	2.16	ourbright = xyz_bright;
341	greg	2.18	} else
342			varset(vwhteff, ':', WHTEFFICACY);
343	greg	1.1	}
344
345
346			combine() /* combine pictures */
347			{
348	greg	1.8	EPNODE coldef[3], brtdef;
349	greg	1.1	COLOR *scanout;
350	greg	1.8	double d;
351	greg	1.1	register int i, j;
352			/* check defined variables */
353	greg	1.4	for (j = 0; j < 3; j++) {
354			if (vardefined(vcolout[j]))
355			coldef[j] = eparse(vcolout[j]);
356			else
357			coldef[j] = NULL;
358			}
359	greg	1.8	if (vardefined(vbrtout))
360			brtdef = eparse(vbrtout);
361			else
362			brtdef = NULL;
363	greg	1.1	/* allocate scanline */
364			scanout = (COLOR )emalloc(xressizeof(COLOR));
365	greg	1.18	/* set input position */
366			yscan = ymax+MIDSCN;
367	greg	1.1	/* combine files */
368			for (ypos = yres-1; ypos >= 0; ypos--) {
369	greg	1.14	advance();
370	greg	1.11	varset(vypos, '=', (double)ypos);
371	greg	1.8	for (xpos = 0; xpos < xres; xpos++) {
372	greg	1.18	xscan = (long)xpos*xmax/xres;
373	greg	1.11	varset(vxpos, '=', (double)xpos);
374	greg	1.8	eclock++;
375			if (brtdef != NULL) {
376			d = evalue(brtdef);
377			if (d < 0.0)
378			d = 0.0;
379			setcolor(scanout[xpos], d, d, d);
380			} else {
381			for (j = 0; j < 3; j++) {
382			if (coldef[j] != NULL) {
383	greg	1.13	d = evalue(coldef[j]);
384	greg	1.8	} else {
385	greg	1.13	d = 0.0;
386	greg	1.8	for (i = 0; i < nfiles; i++)
387	greg	1.18	d += colval(input[i].scan[MIDSCN][xscan],j);
388	greg	1.1	}
389	greg	1.13	if (d < 0.0)
390			d = 0.0;
391			colval(scanout[xpos],j) = d;
392	greg	1.8	}
393	greg	1.1	}
394	greg	1.8	}
395			if (fwritescan(scanout, xres, stdout) < 0) {
396			perror("write error");
397			quit(1);
398			}
399	greg	1.1	}
400			efree(scanout);
401			}
402
403
404	greg	1.18	advance() /* read in data for next scanline */
405	greg	1.14	{
406	greg	1.18	int ytarget;
407	greg	1.14	register COLOR *st;
408			register int i, j;
409
410	greg	1.18	for (ytarget = (long)ypos*ymax/yres; yscan > ytarget; yscan--)
411			for (i = 0; i < nfiles; i++) {
412			st = input[i].scan[WINSIZ-1];
413			for (j = WINSIZ-1; j > 0; j--) /* rotate window */
414			input[i].scan[j] = input[i].scan[j-1];
415			input[i].scan[0] = st;
416			if (yscan <= MIDSCN) /* hit bottom? */
417			continue;
418	greg	2.4	if (freadscan(st, xmax, input[i].fp) < 0) { /* read */
419	greg	1.18	eputs(input[i].name);
420			eputs(": read error\n");
421			quit(1);
422			}
423	greg	2.4	if (fabs(colval(input[i].coef,RED)-1.0) > 1e-3 \|\|
424			fabs(colval(input[i].coef,GRN)-1.0) > 1e-3 \|\|
425			fabs(colval(input[i].coef,BLU)-1.0) > 1e-3)
426			for (j = 0; j < xmax; j++) /* adjust color */
427			multcolor(st[j], input[i].coef);
428	greg	1.14	}
429			}
430
431
432	greg	1.1	double
433	greg	1.17	l_expos(nam) /* return picture exposure */
434	greg	1.15	register char *nam;
435	greg	1.1	{
436	greg	1.15	register int fn, n;
437	greg	1.14
438	greg	1.18	fn = argument(1) - .5;
439			if (fn < 0 \|\| fn >= nfiles)
440			return(1.0);
441	greg	1.17	if (nam == vbrtexp)
442	greg	2.16	return((*ourbright)(input[fn].expos));
443	greg	1.15	n = 3;
444			while (n--)
445	greg	1.17	if (nam == vcolexp[n])
446			return(colval(input[fn].expos,n));
447			eputs("Bad call to l_expos()!\n");
448	greg	1.15	quit(1);
449			}
450
451
452			double
453	greg	2.18	l_pixaspect() /* return pixel aspect ratio */
454			{
455			register int fn;
456
457			fn = argument(1) - .5;
458			if (fn < 0 \|\| fn >= nfiles)
459			return(1.0);
460			return(input[fn].pa);
461			}
462
463
464			double
465	greg	1.15	l_colin(nam) /* return color value for picture */
466			register char *nam;
467			{
468			int fn;
469			register int n, xoff, yoff;
470			double d;
471
472	greg	2.18	fn = argument(1) - .5;
473	greg	1.16	if (fn < 0 \|\| fn >= nfiles) {
474	greg	1.15	errno = EDOM;
475			return(0.0);
476			}
477	greg	1.14	xoff = yoff = 0;
478			n = nargum();
479			if (n >= 2) {
480			d = argument(2);
481			if (d < 0.0) {
482			xoff = d-.5;
483	greg	1.18	if (xscan+xoff < 0)
484			xoff = -xscan;
485	greg	1.14	} else {
486			xoff = d+.5;
487	greg	1.18	if (xscan+xoff >= xmax)
488			xoff = xmax-1-xscan;
489	greg	1.14	}
490			}
491			if (n >= 3) {
492			d = argument(3);
493			if (d < 0.0) {
494			yoff = d-.5;
495			if (yoff+MIDSCN < 0)
496			yoff = -MIDSCN;
497	greg	1.18	if (yscan+yoff < 0)
498			yoff = -yscan;
499	greg	1.14	} else {
500			yoff = d+.5;
501			if (yoff+MIDSCN >= WINSIZ)
502			yoff = WINSIZ-1-MIDSCN;
503	greg	1.18	if (yscan+yoff >= ymax)
504			yoff = ymax-1-yscan;
505	greg	1.14	}
506			}
507	greg	1.15	if (nam == vbrtin)
508	greg	2.16	return((*ourbright)(input[fn].scan[MIDSCN+yoff][xscan+xoff]));
509	greg	1.15	n = 3;
510			while (n--)
511			if (nam == vcolin[n])
512	greg	1.18	return(colval(input[fn].scan[MIDSCN+yoff][xscan+xoff],n));
513	greg	1.15	eputs("Bad call to l_colin()!\n");
514	greg	2.10	quit(1);
515			}
516
517
518			double
519			l_ray(nam) /* return ray origin or direction */
520			register char *nam;
521			{
522	greg	2.15	static unsigned long ltick[MAXINP];
523	greg	2.10	static FVECT lorg[MAXINP], ldir[MAXINP];
524	greg	2.18	static double ldist[MAXINP];
525	greg	2.10	FLOAT loc[2];
526			int fn;
527			register int i;
528
529	greg	2.18	fn = argument(1) - .5;
530	greg	2.10	if (fn < 0 \|\| fn >= nfiles) {
531			errno = EDOM;
532			return(0.0);
533			}
534			if (ltick[fn] < eclock) { /* need to compute? */
535			lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0;
536			ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0;
537			if (input[fn].vw.type == 0)
538	greg	2.12	errno = EDOM;
539	greg	2.10	else {
540	greg	2.11	pix2loc(loc, &input[fn].rs, xscan, ymax-1-yscan);
541	greg	2.18	ldist[fn] = viewray(lorg[fn], ldir[fn],
542			&input[fn].vw, loc[0], loc[1]);
543	greg	2.10	}
544	greg	2.18	ltick[fn] = eclock;
545	greg	2.10	}
546	greg	2.18	if (nam == vray[i=6])
547			return(ldist[fn]);
548	greg	2.10	while (i--)
549			if (nam == vray[i])
550			return(i < 3 ? lorg[fn][i] : ldir[fn][i-3]);
551			eputs("Bad call to l_ray()!\n");
552	greg	1.15	quit(1);
553	greg	2.17	}
554
555
556			double
557			l_psize() /* compute pixel size in steradians */
558			{
559			static unsigned long ltick[MAXINP];
560			static double psize[MAXINP];
561	greg	2.18	FVECT dir0, org, dirx, diry;
562			FLOAT locx[2], locy[2];
563	greg	2.17	double d;
564			int fn;
565	greg	2.18	register int i;
566	greg	2.17
567			d = argument(1);
568	greg	2.18	if (d < .5 \|\| d >= nfiles+.5) {
569	greg	2.17	errno = EDOM;
570			return(0.0);
571			}
572	greg	2.18	fn = d - .5;
573			if (ltick[fn] < eclock) { /* need to compute? */
574			psize[fn] = 0.0;
575			if (input[fn].vw.type == 0)
576	greg	2.17	errno = EDOM;
577	greg	2.18	else if (input[fn].vw.type != VT_PAR &&
578			funvalue(vray[6], 1, &d) >= 0) {
579			for (i = 0; i < 3; i++)
580			dir0[i] = funvalue(vray[3+i], 1, &d);
581			pix2loc(locx, &input[fn].rs, xscan+1, ymax-1-yscan);
582			pix2loc(locy, &input[fn].rs, xscan, ymax-yscan);
583			if (viewray(org, dirx, &input[fn].vw,
584			locx[0], locx[1]) >= 0 &&
585			viewray(org, diry, &input[fn].vw,
586			locy[0], locy[1]) >= 0) {
587	greg	2.17	/* approximate solid angle */
588	greg	2.18	for (i = 0; i < 3; i++) {
589			dirx[i] -= dir0[i];
590			diry[i] -= dir0[i];
591			}
592			fcross(dir0, dirx, diry);
593			psize[fn] = 0.5 * sqrt(DOT(dir0,dir0));
594	greg	2.17	}
595			}
596	greg	2.18	ltick[fn] = eclock;
597			}
598	greg	2.17	return(psize[fn]);
599	greg	1.1	}
600
601
602			wputs(msg)
603			char *msg;
604			{
605			if (!nowarn)
606			eputs(msg);
607			}
608
609
610			eputs(msg)
611			char *msg;
612			{
613			fputs(msg, stderr);
614			}
615
616
617	greg	2.4	quit(code) /* exit gracefully */
618			int code;
619			{
620	greg	2.5	register int i;
621			/* close input files */
622			for (i = 0; i < nfiles; i++)
623	greg	2.6	if (input[i].name == Command)
624			pclose(input[i].fp);
625			else
626			fclose(input[i].fp);
627	greg	1.1	exit(code);
628			}