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    vray[6][4] = {"Ox", "Oy", "Oz", "Dx", "Dy", "Dz"};

char    vpsize[] = "S";

char    vnfiles[] = "nfiles";
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_ray(), l_psize();
        register int    i;
                                                /* define constants */
        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);
        for (i = 0; i < 6; i++)
                funset(vray[i], 1, '=', l_ray);
        funset(vpsize, 1, '=', l_psize);
                                                /* set brightness function */
        if (!strcmp(ourfmt, CIEFMT))
                ourbright = xyz_bright;
}


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

        d = argument(1);
        if (d > -.5 && d < .5)
                return((double)nfiles);
        fn = d - .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];
        FLOAT   loc[2];
        double  d;
        int     fn;
        register int    i;

        d = argument(1);
        if (d > -.5 && d < .5)
                return((double)nfiles);
        fn = d - .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);
                        if (viewray(lorg[fn], ldir[fn],
                                        &input[fn].vw, loc[0], loc[1]) < 0)
                                errno = ERANGE;
                        ltick[fn] = eclock;
                }
        }
        i = 6;
        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, org1, dir1;
        FLOAT   loc[2];
        double  d;
        int     fn;

        d = argument(1);
        if (d > -.5 && d < .5)
                return((double)nfiles);
        fn = d - .5;
        if (fn < 0 || fn >= nfiles) {
                errno = EDOM;
                return(0.0);
        }
        if (ltick[fn] < eclock)                 /* need to compute? */
                if (input[fn].vw.type == 0 || input[fn].vw.type == VT_PAR)
                        errno = EDOM;
                else {
                        errno = 0;
                        dir0[0] = funvalue(vray[3], 1, &d);
                        if (errno)
                                return(0.0);
                        dir0[1] = funvalue(vray[4], 1, &d);
                        if (errno)
                                return(0.0);
                        dir0[2] = funvalue(vray[5], 1, &d);
                        if (errno)
                                return(0.0);
                        pix2loc(loc, &input[fn].rs, xscan+1, ymax-yscan);
                        psize[fn] = 0.0;
                        if (viewray(org1, dir1,
                                        &input[fn].vw, loc[0], loc[1]) < 0)
                                errno = ERANGE;
                        else {
                                                /* approximate solid angle */
                                psize[fn] = dist2(dir0, dir1) * input[fn].pa /
                                        (1.0 + input[fn].pa*input[fn].pa);
                                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:	2.17
Committed:	Fri Aug 30 17:39:39 1996 UTC (27 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.16:	+57 -2 lines
Log Message:	added computation of pixel solid angle ("S" variable)
#	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	1.1
50	greg	2.10	char vray[6][4] = {"Ox", "Oy", "Oz", "Dx", "Dy", "Dz"};
51
52	greg	2.17	char vpsize[] = "S";
53
54	greg	1.18	char vnfiles[] = "nfiles";
55			char vxmax[] = "xmax";
56			char vymax[] = "ymax";
57			char vxres[] = "xres";
58			char vyres[] = "yres";
59			char vxpos[] = "x";
60			char vypos[] = "y";
61	greg	1.1
62			int nowarn = 0; /* no warning messages? */
63
64	greg	1.18	int xmax = 0, ymax = 0; /* input resolution */
65	greg	1.9
66	greg	1.18	int xscan, yscan; /* input position */
67	greg	1.1
68	greg	1.18	int xres, yres; /* output resolution */
69	greg	1.1
70	greg	1.18	int xpos, ypos; /* output position */
71
72	greg	2.10	char progname; / global argv[0] */
73
74	greg	1.10	int wrongformat = 0;
75	greg	2.10	int gotview;
76	greg	1.1
77	greg	1.19	FILE *popen();
78	greg	1.10
79	greg	2.7	extern char *emalloc();
80	greg	1.19
81	greg	2.7
82	greg	1.1	main(argc, argv)
83			int argc;
84			char *argv[];
85			{
86	greg	1.18	int original;
87	greg	1.3	double f;
88	greg	1.14	int a, i;
89	greg	2.7	#ifdef MSDOS
90			extern int _fmode;
91			_fmode = O_BINARY;
92			setmode(fileno(stdin), O_BINARY);
93			setmode(fileno(stdout), O_BINARY);
94			#endif
95	greg	2.10	progname = argv[0];
96	greg	1.15	/* scan options */
97			for (a = 1; a < argc; a++) {
98	greg	1.1	if (argv[a][0] == '-')
99			switch (argv[a][1]) {
100			case 'x':
101			case 'y':
102	greg	1.18	a++;
103	greg	1.15	continue;
104	greg	1.1	case 'w':
105			nowarn = !nowarn;
106	greg	1.15	continue;
107	greg	1.1	case 'f':
108			case 'e':
109	greg	1.16	a++;
110	greg	1.15	continue;
111	greg	1.1	}
112	greg	1.15	break;
113			}
114	greg	2.14	newheader("RADIANCE", stdout); /* start header */
115	greg	1.15	/* process files */
116	greg	1.17	for (nfiles = 0; nfiles < MAXINP; nfiles++) {
117	greg	1.3	setcolor(input[nfiles].coef, 1.0, 1.0, 1.0);
118	greg	1.17	setcolor(input[nfiles].expos, 1.0, 1.0, 1.0);
119	greg	2.10	copystruct(&input[nfiles].vw, &stdview);
120	greg	2.17	input[nfiles].pa = 1.0;
121	greg	1.17	}
122	greg	1.1	nfiles = 0;
123	greg	1.18	original = 0;
124	greg	1.1	for ( ; a < argc; a++) {
125			if (nfiles >= MAXINP) {
126			eputs(argv[0]);
127			eputs(": too many picture files\n");
128			quit(1);
129			}
130	greg	1.3	if (argv[a][0] == '-')
131			switch (argv[a][1]) {
132			case '\0':
133			input[nfiles].name = "<stdin>";
134			input[nfiles].fp = stdin;
135			break;
136	greg	1.17	case 'o':
137			original++;
138	greg	1.22	continue;
139	greg	1.3	case 's':
140			f = atof(argv[++a]);
141			scalecolor(input[nfiles].coef, f);
142			continue;
143			case 'c':
144			colval(input[nfiles].coef,RED)*=atof(argv[++a]);
145			colval(input[nfiles].coef,GRN)*=atof(argv[++a]);
146			colval(input[nfiles].coef,BLU)*=atof(argv[++a]);
147			continue;
148			default:
149			goto usage;
150			}
151			else {
152	greg	2.2	if (argv[a][0] == '!') {
153	greg	2.6	input[nfiles].name = Command;
154	greg	2.2	input[nfiles].fp = popen(argv[a]+1, "r");
155			} else {
156			input[nfiles].name = argv[a];
157			input[nfiles].fp = fopen(argv[a], "r");
158			}
159	greg	1.1	if (input[nfiles].fp == NULL) {
160	greg	1.6	perror(argv[a]);
161	greg	1.1	quit(1);
162			}
163			}
164	greg	1.16	checkfile();
165	greg	1.18	if (original) {
166			colval(input[nfiles].coef,RED) /=
167			colval(input[nfiles].expos,RED);
168			colval(input[nfiles].coef,GRN) /=
169			colval(input[nfiles].expos,GRN);
170			colval(input[nfiles].coef,BLU) /=
171			colval(input[nfiles].expos,BLU);
172			}
173			nfiles++;
174	greg	1.17	original = 0;
175	greg	1.15	}
176	greg	1.18	init(); /* set constants */
177	greg	1.15	/* go back and get expressions */
178			for (a = 1; a < argc; a++) {
179			if (argv[a][0] == '-')
180			switch (argv[a][1]) {
181			case 'x':
182	greg	1.21	varset(vxres, ':', eval(argv[++a]));
183	greg	1.18	continue;
184	greg	1.15	case 'y':
185	greg	1.21	varset(vyres, ':', eval(argv[++a]));
186	greg	1.16	continue;
187	greg	1.15	case 'w':
188			continue;
189			case 'f':
190			fcompile(argv[++a]);
191			continue;
192			case 'e':
193			scompile(argv[++a], NULL, 0);
194			continue;
195			}
196			break;
197			}
198	greg	1.18	/* set/get output resolution */
199			if (!vardefined(vxres))
200			varset(vxres, ':', (double)xmax);
201			if (!vardefined(vyres))
202			varset(vyres, ':', (double)ymax);
203			xres = varvalue(vxres) + .5;
204			yres = varvalue(vyres) + .5;
205			if (xres <= 0 \|\| yres <= 0) {
206			eputs(argv[0]);
207			eputs(": illegal output resolution\n");
208			quit(1);
209			}
210	greg	1.15	/* complete header */
211			printargs(argc, argv, stdout);
212	greg	2.16	if (strcmp(ourfmt, PICFMT))
213			fputformat(ourfmt, stdout); /* print format if known */
214	greg	1.15	putchar('\n');
215	greg	1.23	fprtresolu(xres, yres, stdout);
216	greg	1.15	/* combine pictures */
217			combine();
218			quit(0);
219			usage:
220			eputs("Usage: ");
221			eputs(argv[0]);
222			eputs(
223	greg	2.9	" [-w][-x xr][-y yr][-e expr][-f file] [ [-o][-s f][-c r g b] pic ..]\n");
224	greg	1.15	quit(1);
225			}
226
227
228			tputs(s) /* put out string preceded by a tab */
229			char *s;
230			{
231			char fmt[32];
232			double d;
233			COLOR ctmp;
234
235	greg	2.14	if (isheadid(s)) /* header id */
236			return; /* don't echo */
237			if (formatval(fmt, s)) { /* check format */
238	greg	2.16	if (globmatch(ourfmt, fmt)) {
239			wrongformat = 0;
240			strcpy(ourfmt, fmt);
241			} else
242			wrongformat = 1;
243	greg	1.17	return; /* don't echo */
244			}
245			if (isexpos(s)) { /* exposure */
246			d = exposval(s);
247			scalecolor(input[nfiles].expos, d);
248			} else if (iscolcor(s)) { /* color correction */
249	greg	1.15	colcorval(ctmp, s);
250	greg	1.17	multcolor(input[nfiles].expos, ctmp);
251	greg	2.17	} else if (isaspect(s)) {
252			input[nfiles].pa *= aspectval(s);
253	greg	2.10	} else if (isview(s) && sscanview(&input[nfiles].vw, s) > 0)
254			gotview++;
255	greg	1.17	/* echo line */
256			putchar('\t');
257			fputs(s, stdout);
258	greg	1.16	}
259	greg	1.15
260	greg	1.16
261			checkfile() /* ready a file */
262			{
263			register int i;
264			/* process header */
265	greg	2.10	gotview = 0;
266	greg	1.16	fputs(input[nfiles].name, stdout);
267			fputs(":\n", stdout);
268			getheader(input[nfiles].fp, tputs, NULL);
269			if (wrongformat) {
270			eputs(input[nfiles].name);
271			eputs(": not in Radiance picture format\n");
272			quit(1);
273			}
274	greg	2.10	if (!gotview \|\| setview(&input[nfiles].vw) != NULL)
275			input[nfiles].vw.type = 0;
276			if (!fgetsresolu(&input[nfiles].rs, input[nfiles].fp)) {
277	greg	1.16	eputs(input[nfiles].name);
278			eputs(": bad picture size\n");
279			quit(1);
280			}
281	greg	1.18	if (xmax == 0 && ymax == 0) {
282	greg	2.10	xmax = scanlen(&input[nfiles].rs);
283			ymax = numscans(&input[nfiles].rs);
284			} else if (scanlen(&input[nfiles].rs) != xmax \|\|
285			numscans(&input[nfiles].rs) != ymax) {
286	greg	1.16	eputs(input[nfiles].name);
287			eputs(": resolution mismatch\n");
288			quit(1);
289			}
290			/* allocate scanlines */
291			for (i = 0; i < WINSIZ; i++)
292	greg	1.18	input[nfiles].scan[i] = (COLOR )emalloc(xmaxsizeof(COLOR));
293	greg	1.15	}
294
295
296	greg	2.16	double
297			rgb_bright(clr)
298			COLOR clr;
299			{
300			return(bright(clr));
301			}
302
303
304			double
305			xyz_bright(clr)
306			COLOR clr;
307			{
308			return(clr[CIEY]);
309			}
310
311
312			double (*ourbright)() = rgb_bright;
313
314
315	greg	1.18	init() /* perform final setup */
316	greg	1.15	{
317	greg	2.17	double l_colin(), l_expos(), l_ray(), l_psize();
318	greg	1.16	register int i;
319	greg	1.15	/* define constants */
320			varset(vnfiles, ':', (double)nfiles);
321	greg	1.18	varset(vxmax, ':', (double)xmax);
322			varset(vymax, ':', (double)ymax);
323	greg	1.15	/* set functions */
324			for (i = 0; i < 3; i++) {
325	greg	1.17	funset(vcolexp[i], 1, ':', l_expos);
326	greg	1.15	funset(vcolin[i], 1, '=', l_colin);
327			}
328	greg	1.17	funset(vbrtexp, 1, ':', l_expos);
329	greg	1.15	funset(vbrtin, 1, '=', l_colin);
330	greg	2.10	for (i = 0; i < 6; i++)
331			funset(vray[i], 1, '=', l_ray);
332	greg	2.17	funset(vpsize, 1, '=', l_psize);
333	greg	2.16	/* set brightness function */
334			if (!strcmp(ourfmt, CIEFMT))
335			ourbright = xyz_bright;
336	greg	1.1	}
337
338
339			combine() /* combine pictures */
340			{
341	greg	1.8	EPNODE coldef[3], brtdef;
342	greg	1.1	COLOR *scanout;
343	greg	1.8	double d;
344	greg	1.1	register int i, j;
345			/* check defined variables */
346	greg	1.4	for (j = 0; j < 3; j++) {
347			if (vardefined(vcolout[j]))
348			coldef[j] = eparse(vcolout[j]);
349			else
350			coldef[j] = NULL;
351			}
352	greg	1.8	if (vardefined(vbrtout))
353			brtdef = eparse(vbrtout);
354			else
355			brtdef = NULL;
356	greg	1.1	/* allocate scanline */
357			scanout = (COLOR )emalloc(xressizeof(COLOR));
358	greg	1.18	/* set input position */
359			yscan = ymax+MIDSCN;
360	greg	1.1	/* combine files */
361			for (ypos = yres-1; ypos >= 0; ypos--) {
362	greg	1.14	advance();
363	greg	1.11	varset(vypos, '=', (double)ypos);
364	greg	1.8	for (xpos = 0; xpos < xres; xpos++) {
365	greg	1.18	xscan = (long)xpos*xmax/xres;
366	greg	1.11	varset(vxpos, '=', (double)xpos);
367	greg	1.8	eclock++;
368			if (brtdef != NULL) {
369			d = evalue(brtdef);
370			if (d < 0.0)
371			d = 0.0;
372			setcolor(scanout[xpos], d, d, d);
373			} else {
374			for (j = 0; j < 3; j++) {
375			if (coldef[j] != NULL) {
376	greg	1.13	d = evalue(coldef[j]);
377	greg	1.8	} else {
378	greg	1.13	d = 0.0;
379	greg	1.8	for (i = 0; i < nfiles; i++)
380	greg	1.18	d += colval(input[i].scan[MIDSCN][xscan],j);
381	greg	1.1	}
382	greg	1.13	if (d < 0.0)
383			d = 0.0;
384			colval(scanout[xpos],j) = d;
385	greg	1.8	}
386	greg	1.1	}
387	greg	1.8	}
388			if (fwritescan(scanout, xres, stdout) < 0) {
389			perror("write error");
390			quit(1);
391			}
392	greg	1.1	}
393			efree(scanout);
394			}
395
396
397	greg	1.18	advance() /* read in data for next scanline */
398	greg	1.14	{
399	greg	1.18	int ytarget;
400	greg	1.14	register COLOR *st;
401			register int i, j;
402
403	greg	1.18	for (ytarget = (long)ypos*ymax/yres; yscan > ytarget; yscan--)
404			for (i = 0; i < nfiles; i++) {
405			st = input[i].scan[WINSIZ-1];
406			for (j = WINSIZ-1; j > 0; j--) /* rotate window */
407			input[i].scan[j] = input[i].scan[j-1];
408			input[i].scan[0] = st;
409			if (yscan <= MIDSCN) /* hit bottom? */
410			continue;
411	greg	2.4	if (freadscan(st, xmax, input[i].fp) < 0) { /* read */
412	greg	1.18	eputs(input[i].name);
413			eputs(": read error\n");
414			quit(1);
415			}
416	greg	2.4	if (fabs(colval(input[i].coef,RED)-1.0) > 1e-3 \|\|
417			fabs(colval(input[i].coef,GRN)-1.0) > 1e-3 \|\|
418			fabs(colval(input[i].coef,BLU)-1.0) > 1e-3)
419			for (j = 0; j < xmax; j++) /* adjust color */
420			multcolor(st[j], input[i].coef);
421	greg	1.14	}
422			}
423
424
425	greg	1.1	double
426	greg	1.17	l_expos(nam) /* return picture exposure */
427	greg	1.15	register char *nam;
428	greg	1.1	{
429	greg	1.15	register int fn, n;
430	greg	1.14
431	greg	1.18	fn = argument(1) - .5;
432			if (fn < 0 \|\| fn >= nfiles)
433			return(1.0);
434	greg	1.17	if (nam == vbrtexp)
435	greg	2.16	return((*ourbright)(input[fn].expos));
436	greg	1.15	n = 3;
437			while (n--)
438	greg	1.17	if (nam == vcolexp[n])
439			return(colval(input[fn].expos,n));
440			eputs("Bad call to l_expos()!\n");
441	greg	1.15	quit(1);
442			}
443
444
445			double
446			l_colin(nam) /* return color value for picture */
447			register char *nam;
448			{
449			int fn;
450			register int n, xoff, yoff;
451			double d;
452
453	greg	1.16	d = argument(1);
454			if (d > -.5 && d < .5)
455			return((double)nfiles);
456			fn = d - .5;
457			if (fn < 0 \|\| fn >= nfiles) {
458	greg	1.15	errno = EDOM;
459			return(0.0);
460			}
461	greg	1.14	xoff = yoff = 0;
462			n = nargum();
463			if (n >= 2) {
464			d = argument(2);
465			if (d < 0.0) {
466			xoff = d-.5;
467	greg	1.18	if (xscan+xoff < 0)
468			xoff = -xscan;
469	greg	1.14	} else {
470			xoff = d+.5;
471	greg	1.18	if (xscan+xoff >= xmax)
472			xoff = xmax-1-xscan;
473	greg	1.14	}
474			}
475			if (n >= 3) {
476			d = argument(3);
477			if (d < 0.0) {
478			yoff = d-.5;
479			if (yoff+MIDSCN < 0)
480			yoff = -MIDSCN;
481	greg	1.18	if (yscan+yoff < 0)
482			yoff = -yscan;
483	greg	1.14	} else {
484			yoff = d+.5;
485			if (yoff+MIDSCN >= WINSIZ)
486			yoff = WINSIZ-1-MIDSCN;
487	greg	1.18	if (yscan+yoff >= ymax)
488			yoff = ymax-1-yscan;
489	greg	1.14	}
490			}
491	greg	1.15	if (nam == vbrtin)
492	greg	2.16	return((*ourbright)(input[fn].scan[MIDSCN+yoff][xscan+xoff]));
493	greg	1.15	n = 3;
494			while (n--)
495			if (nam == vcolin[n])
496	greg	1.18	return(colval(input[fn].scan[MIDSCN+yoff][xscan+xoff],n));
497	greg	1.15	eputs("Bad call to l_colin()!\n");
498	greg	2.10	quit(1);
499			}
500
501
502			double
503			l_ray(nam) /* return ray origin or direction */
504			register char *nam;
505			{
506	greg	2.15	static unsigned long ltick[MAXINP];
507	greg	2.10	static FVECT lorg[MAXINP], ldir[MAXINP];
508			FLOAT loc[2];
509			double d;
510			int fn;
511			register int i;
512
513			d = argument(1);
514			if (d > -.5 && d < .5)
515			return((double)nfiles);
516			fn = d - .5;
517			if (fn < 0 \|\| fn >= nfiles) {
518			errno = EDOM;
519			return(0.0);
520			}
521			if (ltick[fn] < eclock) { /* need to compute? */
522			lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0;
523			ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0;
524			if (input[fn].vw.type == 0)
525	greg	2.12	errno = EDOM;
526	greg	2.10	else {
527	greg	2.11	pix2loc(loc, &input[fn].rs, xscan, ymax-1-yscan);
528	greg	2.10	if (viewray(lorg[fn], ldir[fn],
529			&input[fn].vw, loc[0], loc[1]) < 0)
530			errno = ERANGE;
531	greg	2.17	ltick[fn] = eclock;
532	greg	2.10	}
533			}
534			i = 6;
535			while (i--)
536			if (nam == vray[i])
537			return(i < 3 ? lorg[fn][i] : ldir[fn][i-3]);
538			eputs("Bad call to l_ray()!\n");
539	greg	1.15	quit(1);
540	greg	2.17	}
541
542
543			double
544			l_psize() /* compute pixel size in steradians */
545			{
546			static unsigned long ltick[MAXINP];
547			static double psize[MAXINP];
548			FVECT dir0, org1, dir1;
549			FLOAT loc[2];
550			double d;
551			int fn;
552
553			d = argument(1);
554			if (d > -.5 && d < .5)
555			return((double)nfiles);
556			fn = d - .5;
557			if (fn < 0 \|\| fn >= nfiles) {
558			errno = EDOM;
559			return(0.0);
560			}
561			if (ltick[fn] < eclock) /* need to compute? */
562			if (input[fn].vw.type == 0 \|\| input[fn].vw.type == VT_PAR)
563			errno = EDOM;
564			else {
565			errno = 0;
566			dir0[0] = funvalue(vray[3], 1, &d);
567			if (errno)
568			return(0.0);
569			dir0[1] = funvalue(vray[4], 1, &d);
570			if (errno)
571			return(0.0);
572			dir0[2] = funvalue(vray[5], 1, &d);
573			if (errno)
574			return(0.0);
575			pix2loc(loc, &input[fn].rs, xscan+1, ymax-yscan);
576			psize[fn] = 0.0;
577			if (viewray(org1, dir1,
578			&input[fn].vw, loc[0], loc[1]) < 0)
579			errno = ERANGE;
580			else {
581			/* approximate solid angle */
582			psize[fn] = dist2(dir0, dir1) * input[fn].pa /
583			(1.0 + input[fn].pa*input[fn].pa);
584			ltick[fn] = eclock;
585			}
586			}
587			return(psize[fn]);
588	greg	1.1	}
589
590
591			wputs(msg)
592			char *msg;
593			{
594			if (!nowarn)
595			eputs(msg);
596			}
597
598
599			eputs(msg)
600			char *msg;
601			{
602			fputs(msg, stderr);
603			}
604
605
606	greg	2.4	quit(code) /* exit gracefully */
607			int code;
608			{
609	greg	2.5	register int i;
610			/* close input files */
611			for (i = 0; i < nfiles; i++)
612	greg	2.6	if (input[i].name == Command)
613			pclose(input[i].fp);
614			else
615			fclose(input[i].fp);
616	greg	1.1	exit(code);
617			}