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 */
        COLOR   *scan[WINSIZ];  /* input scanline window */
        COLOR   coef;           /* coefficient */
        COLOR   expos;          /* recorded exposure */
}       input[MAXINP];                  /* input pictures */

int     nfiles;                         /* number of input files */

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    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);
        }
        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);
        fputformat(COLRFMT, stdout);
        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 */
                wrongformat = strcmp(fmt, COLRFMT);
                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 (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));
}


init()                                  /* perform final setup */
{
        double  l_colin(), l_expos(), l_ray();
        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);
}


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(bright(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(bright(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 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);
}


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:	2.14
Committed:	Sun Feb 27 10:16:52 1994 UTC (30 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.13:	+4 -2 lines
Log Message:	Added new ID to first line of header and changed use of formatval
#	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	1.14	COLOR scan[WINSIZ]; / input scanline window */
33	greg	1.3	COLOR coef; /* coefficient */
34	greg	1.17	COLOR expos; /* recorded exposure */
35	greg	1.1	} input[MAXINP]; /* input pictures */
36
37			int nfiles; /* number of input files */
38
39	greg	2.6	char Command[] = "<Command>";
40	greg	1.21	char vcolin[3][4] = {"ri", "gi", "bi"};
41			char vcolout[3][4] = {"ro", "go", "bo"};
42	greg	1.15	char vbrtin[] = "li";
43			char vbrtout[] = "lo";
44	greg	1.21	char vcolexp[3][4] = {"re", "ge", "be"};
45	greg	1.17	char vbrtexp[] = "le";
46	greg	1.1
47	greg	2.10	char vray[6][4] = {"Ox", "Oy", "Oz", "Dx", "Dy", "Dz"};
48
49	greg	1.18	char vnfiles[] = "nfiles";
50			char vxmax[] = "xmax";
51			char vymax[] = "ymax";
52			char vxres[] = "xres";
53			char vyres[] = "yres";
54			char vxpos[] = "x";
55			char vypos[] = "y";
56	greg	1.1
57			int nowarn = 0; /* no warning messages? */
58
59	greg	1.18	int xmax = 0, ymax = 0; /* input resolution */
60	greg	1.9
61	greg	1.18	int xscan, yscan; /* input position */
62	greg	1.1
63	greg	1.18	int xres, yres; /* output resolution */
64	greg	1.1
65	greg	1.18	int xpos, ypos; /* output position */
66
67	greg	2.10	char progname; / global argv[0] */
68
69	greg	1.10	int wrongformat = 0;
70	greg	2.10	int gotview;
71	greg	1.1
72	greg	1.19	FILE *popen();
73	greg	1.10
74	greg	2.7	extern char *emalloc();
75	greg	1.19
76	greg	2.7
77	greg	1.1	main(argc, argv)
78			int argc;
79			char *argv[];
80			{
81	greg	1.18	int original;
82	greg	1.3	double f;
83	greg	1.14	int a, i;
84	greg	2.7	#ifdef MSDOS
85			extern int _fmode;
86			_fmode = O_BINARY;
87			setmode(fileno(stdin), O_BINARY);
88			setmode(fileno(stdout), O_BINARY);
89			#endif
90	greg	2.10	progname = argv[0];
91	greg	1.15	/* scan options */
92			for (a = 1; a < argc; a++) {
93	greg	1.1	if (argv[a][0] == '-')
94			switch (argv[a][1]) {
95			case 'x':
96			case 'y':
97	greg	1.18	a++;
98	greg	1.15	continue;
99	greg	1.1	case 'w':
100			nowarn = !nowarn;
101	greg	1.15	continue;
102	greg	1.1	case 'f':
103			case 'e':
104	greg	1.16	a++;
105	greg	1.15	continue;
106	greg	1.1	}
107	greg	1.15	break;
108			}
109	greg	2.14	newheader("RADIANCE", stdout); /* start header */
110	greg	1.15	/* process files */
111	greg	1.17	for (nfiles = 0; nfiles < MAXINP; nfiles++) {
112	greg	1.3	setcolor(input[nfiles].coef, 1.0, 1.0, 1.0);
113	greg	1.17	setcolor(input[nfiles].expos, 1.0, 1.0, 1.0);
114	greg	2.10	copystruct(&input[nfiles].vw, &stdview);
115	greg	1.17	}
116	greg	1.1	nfiles = 0;
117	greg	1.18	original = 0;
118	greg	1.1	for ( ; a < argc; a++) {
119			if (nfiles >= MAXINP) {
120			eputs(argv[0]);
121			eputs(": too many picture files\n");
122			quit(1);
123			}
124	greg	1.3	if (argv[a][0] == '-')
125			switch (argv[a][1]) {
126			case '\0':
127			input[nfiles].name = "<stdin>";
128			input[nfiles].fp = stdin;
129			break;
130	greg	1.17	case 'o':
131			original++;
132	greg	1.22	continue;
133	greg	1.3	case 's':
134			f = atof(argv[++a]);
135			scalecolor(input[nfiles].coef, f);
136			continue;
137			case 'c':
138			colval(input[nfiles].coef,RED)*=atof(argv[++a]);
139			colval(input[nfiles].coef,GRN)*=atof(argv[++a]);
140			colval(input[nfiles].coef,BLU)*=atof(argv[++a]);
141			continue;
142			default:
143			goto usage;
144			}
145			else {
146	greg	2.2	if (argv[a][0] == '!') {
147	greg	2.6	input[nfiles].name = Command;
148	greg	2.2	input[nfiles].fp = popen(argv[a]+1, "r");
149			} else {
150			input[nfiles].name = argv[a];
151			input[nfiles].fp = fopen(argv[a], "r");
152			}
153	greg	1.1	if (input[nfiles].fp == NULL) {
154	greg	1.6	perror(argv[a]);
155	greg	1.1	quit(1);
156			}
157			}
158	greg	1.16	checkfile();
159	greg	1.18	if (original) {
160			colval(input[nfiles].coef,RED) /=
161			colval(input[nfiles].expos,RED);
162			colval(input[nfiles].coef,GRN) /=
163			colval(input[nfiles].expos,GRN);
164			colval(input[nfiles].coef,BLU) /=
165			colval(input[nfiles].expos,BLU);
166			}
167			nfiles++;
168	greg	1.17	original = 0;
169	greg	1.15	}
170	greg	1.18	init(); /* set constants */
171	greg	1.15	/* go back and get expressions */
172			for (a = 1; a < argc; a++) {
173			if (argv[a][0] == '-')
174			switch (argv[a][1]) {
175			case 'x':
176	greg	1.21	varset(vxres, ':', eval(argv[++a]));
177	greg	1.18	continue;
178	greg	1.15	case 'y':
179	greg	1.21	varset(vyres, ':', eval(argv[++a]));
180	greg	1.16	continue;
181	greg	1.15	case 'w':
182			continue;
183			case 'f':
184			fcompile(argv[++a]);
185			continue;
186			case 'e':
187			scompile(argv[++a], NULL, 0);
188			continue;
189			}
190			break;
191			}
192	greg	1.18	/* set/get output resolution */
193			if (!vardefined(vxres))
194			varset(vxres, ':', (double)xmax);
195			if (!vardefined(vyres))
196			varset(vyres, ':', (double)ymax);
197			xres = varvalue(vxres) + .5;
198			yres = varvalue(vyres) + .5;
199			if (xres <= 0 \|\| yres <= 0) {
200			eputs(argv[0]);
201			eputs(": illegal output resolution\n");
202			quit(1);
203			}
204	greg	1.15	/* complete header */
205			printargs(argc, argv, stdout);
206			fputformat(COLRFMT, stdout);
207			putchar('\n');
208	greg	1.23	fprtresolu(xres, yres, stdout);
209	greg	1.15	/* combine pictures */
210			combine();
211			quit(0);
212			usage:
213			eputs("Usage: ");
214			eputs(argv[0]);
215			eputs(
216	greg	2.9	" [-w][-x xr][-y yr][-e expr][-f file] [ [-o][-s f][-c r g b] pic ..]\n");
217	greg	1.15	quit(1);
218			}
219
220
221			tputs(s) /* put out string preceded by a tab */
222			char *s;
223			{
224			char fmt[32];
225			double d;
226			COLOR ctmp;
227
228	greg	2.14	if (isheadid(s)) /* header id */
229			return; /* don't echo */
230			if (formatval(fmt, s)) { /* check format */
231	greg	1.15	wrongformat = strcmp(fmt, COLRFMT);
232	greg	1.17	return; /* don't echo */
233			}
234			if (isexpos(s)) { /* exposure */
235			d = exposval(s);
236			scalecolor(input[nfiles].expos, d);
237			} else if (iscolcor(s)) { /* color correction */
238	greg	1.15	colcorval(ctmp, s);
239	greg	1.17	multcolor(input[nfiles].expos, ctmp);
240	greg	2.10	} else if (isview(s) && sscanview(&input[nfiles].vw, s) > 0)
241			gotview++;
242	greg	1.17	/* echo line */
243			putchar('\t');
244			fputs(s, stdout);
245	greg	1.16	}
246	greg	1.15
247	greg	1.16
248			checkfile() /* ready a file */
249			{
250			register int i;
251			/* process header */
252	greg	2.10	gotview = 0;
253	greg	1.16	fputs(input[nfiles].name, stdout);
254			fputs(":\n", stdout);
255			getheader(input[nfiles].fp, tputs, NULL);
256			if (wrongformat) {
257			eputs(input[nfiles].name);
258			eputs(": not in Radiance picture format\n");
259			quit(1);
260			}
261	greg	2.10	if (!gotview \|\| setview(&input[nfiles].vw) != NULL)
262			input[nfiles].vw.type = 0;
263			if (!fgetsresolu(&input[nfiles].rs, input[nfiles].fp)) {
264	greg	1.16	eputs(input[nfiles].name);
265			eputs(": bad picture size\n");
266			quit(1);
267			}
268	greg	1.18	if (xmax == 0 && ymax == 0) {
269	greg	2.10	xmax = scanlen(&input[nfiles].rs);
270			ymax = numscans(&input[nfiles].rs);
271			} else if (scanlen(&input[nfiles].rs) != xmax \|\|
272			numscans(&input[nfiles].rs) != ymax) {
273	greg	1.16	eputs(input[nfiles].name);
274			eputs(": resolution mismatch\n");
275			quit(1);
276			}
277			/* allocate scanlines */
278			for (i = 0; i < WINSIZ; i++)
279	greg	1.18	input[nfiles].scan[i] = (COLOR )emalloc(xmaxsizeof(COLOR));
280	greg	1.15	}
281
282
283	greg	1.18	init() /* perform final setup */
284	greg	1.15	{
285	greg	2.10	double l_colin(), l_expos(), l_ray();
286	greg	1.16	register int i;
287	greg	1.15	/* define constants */
288			varset(vnfiles, ':', (double)nfiles);
289	greg	1.18	varset(vxmax, ':', (double)xmax);
290			varset(vymax, ':', (double)ymax);
291	greg	1.15	/* set functions */
292			for (i = 0; i < 3; i++) {
293	greg	1.17	funset(vcolexp[i], 1, ':', l_expos);
294	greg	1.15	funset(vcolin[i], 1, '=', l_colin);
295			}
296	greg	1.17	funset(vbrtexp, 1, ':', l_expos);
297	greg	1.15	funset(vbrtin, 1, '=', l_colin);
298	greg	2.10	for (i = 0; i < 6; i++)
299			funset(vray[i], 1, '=', l_ray);
300	greg	1.1	}
301
302
303			combine() /* combine pictures */
304			{
305	greg	1.8	EPNODE coldef[3], brtdef;
306	greg	1.1	COLOR *scanout;
307	greg	1.8	double d;
308	greg	1.1	register int i, j;
309			/* check defined variables */
310	greg	1.4	for (j = 0; j < 3; j++) {
311			if (vardefined(vcolout[j]))
312			coldef[j] = eparse(vcolout[j]);
313			else
314			coldef[j] = NULL;
315			}
316	greg	1.8	if (vardefined(vbrtout))
317			brtdef = eparse(vbrtout);
318			else
319			brtdef = NULL;
320	greg	1.1	/* allocate scanline */
321			scanout = (COLOR )emalloc(xressizeof(COLOR));
322	greg	1.18	/* set input position */
323			yscan = ymax+MIDSCN;
324	greg	1.1	/* combine files */
325			for (ypos = yres-1; ypos >= 0; ypos--) {
326	greg	1.14	advance();
327	greg	1.11	varset(vypos, '=', (double)ypos);
328	greg	1.8	for (xpos = 0; xpos < xres; xpos++) {
329	greg	1.18	xscan = (long)xpos*xmax/xres;
330	greg	1.11	varset(vxpos, '=', (double)xpos);
331	greg	1.8	eclock++;
332			if (brtdef != NULL) {
333			d = evalue(brtdef);
334			if (d < 0.0)
335			d = 0.0;
336			setcolor(scanout[xpos], d, d, d);
337			} else {
338			for (j = 0; j < 3; j++) {
339			if (coldef[j] != NULL) {
340	greg	1.13	d = evalue(coldef[j]);
341	greg	1.8	} else {
342	greg	1.13	d = 0.0;
343	greg	1.8	for (i = 0; i < nfiles; i++)
344	greg	1.18	d += colval(input[i].scan[MIDSCN][xscan],j);
345	greg	1.1	}
346	greg	1.13	if (d < 0.0)
347			d = 0.0;
348			colval(scanout[xpos],j) = d;
349	greg	1.8	}
350	greg	1.1	}
351	greg	1.8	}
352			if (fwritescan(scanout, xres, stdout) < 0) {
353			perror("write error");
354			quit(1);
355			}
356	greg	1.1	}
357			efree(scanout);
358			}
359
360
361	greg	1.18	advance() /* read in data for next scanline */
362	greg	1.14	{
363	greg	1.18	int ytarget;
364	greg	1.14	register COLOR *st;
365			register int i, j;
366
367	greg	1.18	for (ytarget = (long)ypos*ymax/yres; yscan > ytarget; yscan--)
368			for (i = 0; i < nfiles; i++) {
369			st = input[i].scan[WINSIZ-1];
370			for (j = WINSIZ-1; j > 0; j--) /* rotate window */
371			input[i].scan[j] = input[i].scan[j-1];
372			input[i].scan[0] = st;
373			if (yscan <= MIDSCN) /* hit bottom? */
374			continue;
375	greg	2.4	if (freadscan(st, xmax, input[i].fp) < 0) { /* read */
376	greg	1.18	eputs(input[i].name);
377			eputs(": read error\n");
378			quit(1);
379			}
380	greg	2.4	if (fabs(colval(input[i].coef,RED)-1.0) > 1e-3 \|\|
381			fabs(colval(input[i].coef,GRN)-1.0) > 1e-3 \|\|
382			fabs(colval(input[i].coef,BLU)-1.0) > 1e-3)
383			for (j = 0; j < xmax; j++) /* adjust color */
384			multcolor(st[j], input[i].coef);
385	greg	1.14	}
386			}
387
388
389	greg	1.1	double
390	greg	1.17	l_expos(nam) /* return picture exposure */
391	greg	1.15	register char *nam;
392	greg	1.1	{
393	greg	1.15	register int fn, n;
394	greg	1.14
395	greg	1.18	fn = argument(1) - .5;
396			if (fn < 0 \|\| fn >= nfiles)
397			return(1.0);
398	greg	1.17	if (nam == vbrtexp)
399			return(bright(input[fn].expos));
400	greg	1.15	n = 3;
401			while (n--)
402	greg	1.17	if (nam == vcolexp[n])
403			return(colval(input[fn].expos,n));
404			eputs("Bad call to l_expos()!\n");
405	greg	1.15	quit(1);
406			}
407
408
409			double
410			l_colin(nam) /* return color value for picture */
411			register char *nam;
412			{
413			int fn;
414			register int n, xoff, yoff;
415			double d;
416
417	greg	1.16	d = argument(1);
418			if (d > -.5 && d < .5)
419			return((double)nfiles);
420			fn = d - .5;
421			if (fn < 0 \|\| fn >= nfiles) {
422	greg	1.15	errno = EDOM;
423			return(0.0);
424			}
425	greg	1.14	xoff = yoff = 0;
426			n = nargum();
427			if (n >= 2) {
428			d = argument(2);
429			if (d < 0.0) {
430			xoff = d-.5;
431	greg	1.18	if (xscan+xoff < 0)
432			xoff = -xscan;
433	greg	1.14	} else {
434			xoff = d+.5;
435	greg	1.18	if (xscan+xoff >= xmax)
436			xoff = xmax-1-xscan;
437	greg	1.14	}
438			}
439			if (n >= 3) {
440			d = argument(3);
441			if (d < 0.0) {
442			yoff = d-.5;
443			if (yoff+MIDSCN < 0)
444			yoff = -MIDSCN;
445	greg	1.18	if (yscan+yoff < 0)
446			yoff = -yscan;
447	greg	1.14	} else {
448			yoff = d+.5;
449			if (yoff+MIDSCN >= WINSIZ)
450			yoff = WINSIZ-1-MIDSCN;
451	greg	1.18	if (yscan+yoff >= ymax)
452			yoff = ymax-1-yscan;
453	greg	1.14	}
454			}
455	greg	1.15	if (nam == vbrtin)
456	greg	1.18	return(bright(input[fn].scan[MIDSCN+yoff][xscan+xoff]));
457	greg	1.15	n = 3;
458			while (n--)
459			if (nam == vcolin[n])
460	greg	1.18	return(colval(input[fn].scan[MIDSCN+yoff][xscan+xoff],n));
461	greg	1.15	eputs("Bad call to l_colin()!\n");
462	greg	2.10	quit(1);
463			}
464
465
466			double
467			l_ray(nam) /* return ray origin or direction */
468			register char *nam;
469			{
470			static long ltick[MAXINP];
471			static FVECT lorg[MAXINP], ldir[MAXINP];
472			FLOAT loc[2];
473			double d;
474			int fn;
475			register int i;
476
477			d = argument(1);
478			if (d > -.5 && d < .5)
479			return((double)nfiles);
480			fn = d - .5;
481			if (fn < 0 \|\| fn >= nfiles) {
482			errno = EDOM;
483			return(0.0);
484			}
485			if (ltick[fn] < eclock) { /* need to compute? */
486			lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0;
487			ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0;
488			if (input[fn].vw.type == 0)
489	greg	2.12	errno = EDOM;
490	greg	2.10	else {
491	greg	2.11	pix2loc(loc, &input[fn].rs, xscan, ymax-1-yscan);
492	greg	2.10	if (viewray(lorg[fn], ldir[fn],
493			&input[fn].vw, loc[0], loc[1]) < 0)
494			errno = ERANGE;
495			}
496			ltick[fn] = eclock;
497			}
498			i = 6;
499			while (i--)
500			if (nam == vray[i])
501			return(i < 3 ? lorg[fn][i] : ldir[fn][i-3]);
502			eputs("Bad call to l_ray()!\n");
503	greg	1.15	quit(1);
504	greg	1.1	}
505
506
507			wputs(msg)
508			char *msg;
509			{
510			if (!nowarn)
511			eputs(msg);
512			}
513
514
515			eputs(msg)
516			char *msg;
517			{
518			fputs(msg, stderr);
519			}
520
521
522	greg	2.4	quit(code) /* exit gracefully */
523			int code;
524			{
525	greg	2.5	register int i;
526			/* close input files */
527			for (i = 0; i < nfiles; i++)
528	greg	2.6	if (input[i].name == Command)
529			pclose(input[i].fp);
530			else
531			fclose(input[i].fp);
532	greg	1.1	exit(code);
533			}