src/util/dctimestep.c

#ifndef lint
static const char RCSid[] = "$Id: dctimestep.c,v 2.37 2016/03/06 01:13:18 schorsch Exp $";
#endif
/*
 * Compute time-step result using Daylight Coefficient method.
 *
 *      G. Ward
 */

#include <ctype.h>
#include "platform.h"
#include "standard.h"
#include "cmatrix.h"
#include "platform.h"
#include "resolu.h"

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

/* Sum together a set of images and write result to fout */
static int
sum_images(const char *fspec, const CMATRIX *cv, FILE *fout)
{
        int     myDT = DTfromHeader;
        COLR    *scanline = NULL;
        CMATRIX *pmat = NULL;
        int     myXR=0, myYR=0;
        int     i, y;

        if (cv->ncols != 1)
                error(INTERNAL, "expected vector in sum_images()");
        for (i = 0; i < cv->nrows; i++) {
                const COLORV    *scv = cv_lval(cv,i);
                char            fname[1024];
                FILE            *fp;
                int             dt, xr, yr;
                COLORV          *psp;
                char            *err;
                                                        /* check for zero */
                if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0) &&
                                (myDT != DTfromHeader) | (i < cv->nrows-1))
                        continue;
                                                        /* open next picture */
                sprintf(fname, fspec, i);
                if ((fp = fopen(fname, "rb")) == NULL) {
                        sprintf(errmsg, "cannot open picture '%s'", fname);
                        error(SYSTEM, errmsg);
                }
                dt = DTfromHeader;
                if ((err = cm_getheader(&dt, NULL, NULL, fp)) != NULL)
                        error(USER, err);
                if ((dt != DTrgbe) & (dt != DTxyze) ||
                                !fscnresolu(&xr, &yr, fp)) {
                        sprintf(errmsg, "file '%s' not a picture", fname);
                        error(USER, errmsg);
                }
                if (myDT == DTfromHeader) {             /* on first one */
                        myDT = dt;
                        myXR = xr; myYR = yr;
                        scanline = (COLR *)malloc(sizeof(COLR)*myXR);
                        if (scanline == NULL)
                                error(SYSTEM, "out of memory in sum_images()");
                        pmat = cm_alloc(myYR, myXR);
                        memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
                                                        /* finish header */
                        fputformat((char *)cm_fmt_id[myDT], fout);
                        fputc('\n', fout);
                        fflush(fout);
                } else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
                        sprintf(errmsg, "picture '%s' format/size mismatch",
                                        fname);
                        error(USER, errmsg);
                }
                psp = pmat->cmem;
                for (y = 0; y < yr; y++) {              /* read it in */
                        COLOR   col;
                        int     x;
                        if (freadcolrs(scanline, xr, fp) < 0) {
                                sprintf(errmsg, "error reading picture '%s'",
                                                fname);
                                error(SYSTEM, errmsg);
                        }
                                                        /* sum in scanline */
                        for (x = 0; x < xr; x++, psp += 3) {
                                if (!scanline[x][EXP])
                                        continue;       /* skip zeroes */
                                colr_color(col, scanline[x]);
                                multcolor(col, scv);
                                addcolor(psp, col);
                        }
                }
                fclose(fp);                             /* done this picture */
        }
        free(scanline);
        i = cm_write(pmat, myDT, fout);                 /* write picture */
        cm_free(pmat);                                  /* free data */
        return(i);
}

/* check to see if a string contains a %d or %o specification */
static int
hasNumberFormat(const char *s)
{
        if (s == NULL)
                return(0);

        while (*s) {
                while (*s != '%')
                        if (!*s++)
                                return(0);
                if (*++s == '%') {              /* ignore "%%" */
                        ++s;
                        continue;
                }
                while (isdigit(*s))             /* field length */
                        ++s;
                                                /* field we'll use? */
                if ((*s == 'd') | (*s == 'i') | (*s == 'o') |
                                        (*s == 'x') | (*s == 'X'))
                        return(1);
        }
        return(0);                              /* didn't find one */
}

int
main(int argc, char *argv[])
{
        int             skyfmt = DTfromHeader;
        int             outfmt = DTascii;
        int             headout = 1;
        int             nsteps = 0;
        char            *ofspec = NULL;
        FILE            *ofp = stdout;
        CMATRIX         *cmtx;          /* component vector/matrix result */
        char            fnbuf[256];
        int             a, i;

        progname = argv[0];
                                        /* get options */
        for (a = 1; a < argc && argv[a][0] == '-'; a++)
                switch (argv[a][1]) {
                case 'n':
                        nsteps = atoi(argv[++a]);
                        if (nsteps < 0)
                                goto userr;
                        skyfmt = nsteps ? DTascii : DTfromHeader;
                        break;
                case 'h':
                        headout = !headout;
                        break;
                case 'i':
                        switch (argv[a][2]) {
                        case 'f':
                                skyfmt = DTfloat;
                                break;
                        case 'd':
                                skyfmt = DTdouble;
                                break;
                        case 'a':
                                skyfmt = DTascii;
                                break;
                        default:
                                goto userr;
                        }
                        break;
                case 'o':
                        switch (argv[a][2]) {
                        case '\0':      /* output specification (not format) */
                                ofspec = argv[++a];
                                break;
                        case 'f':
                                outfmt = DTfloat;
                                break;
                        case 'd':
                                outfmt = DTdouble;
                                break;
                        case 'a':
                                outfmt = DTascii;
                                break;
                        default:
                                goto userr;
                        }
                        break;
                default:
                        goto userr;
                }
        if ((argc-a < 1) | (argc-a > 4))
                goto userr;

        if (argc-a > 2) {                       /* VTDs expression */
                CMATRIX         *smtx, *Dmat, *Tmat, *imtx;
                const char      *ccp;
                                                /* get sky vector/matrix */
                smtx = cm_load(argv[a+3], 0, nsteps, skyfmt);
                nsteps = smtx->ncols;
                                                /* load BSDF */
                if (argv[a+1][0] != '!' &&
                                (ccp = strrchr(argv[a+1], '.')) != NULL &&
                                !strcasecmp(ccp+1, "XML"))
                        Tmat = cm_loadBTDF(argv[a+1]);
                else
                        Tmat = cm_load(argv[a+1], 0, 0, DTfromHeader);
                                                /* load Daylight matrix */
                Dmat = cm_load(argv[a+2], Tmat->ncols,
                                        smtx->nrows, DTfromHeader);
                                                /* multiply vector through */
                imtx = cm_multiply(Dmat, smtx);
                cm_free(Dmat); cm_free(smtx);
                cmtx = cm_multiply(Tmat, imtx);
                cm_free(Tmat); 
                cm_free(imtx);
        } else {                                /* sky vector/matrix only */
                cmtx = cm_load(argv[a+1], 0, nsteps, skyfmt);
                nsteps = cmtx->ncols;
        }
                                                /* prepare output stream */
        if ((ofspec != NULL) & (nsteps == 1) && hasNumberFormat(ofspec)) {
                sprintf(fnbuf, ofspec, 1);
                ofspec = fnbuf;
        }
        if (ofspec != NULL && !hasNumberFormat(ofspec)) {
                if ((ofp = fopen(ofspec, "w")) == NULL) {
                        fprintf(stderr, "%s: cannot open '%s' for output\n",
                                        progname, ofspec);
                        return(1);
                }
                ofspec = NULL;                  /* only need to open once */
        }
        if (hasNumberFormat(argv[a])) {         /* generating image(s) */
                if (ofspec == NULL) {
                        SET_FILE_BINARY(ofp);
                        newheader("RADIANCE", ofp);
                        printargs(argc, argv, ofp);
                        fputnow(ofp);
                }
                if (nsteps > 1)                 /* multiple output frames? */
                        for (i = 0; i < nsteps; i++) {
                                CMATRIX *cvec = cm_column(cmtx, i);
                                if (ofspec != NULL) {
                                        sprintf(fnbuf, ofspec, i+1);
                                        if ((ofp = fopen(fnbuf, "wb")) == NULL) {
                                                fprintf(stderr,
                                        "%s: cannot open '%s' for output\n",
                                                        progname, fnbuf);
                                                return(1);
                                        }
                                        newheader("RADIANCE", ofp);
                                        printargs(argc, argv, ofp);
                                        fputnow(ofp);
                                }
                                fprintf(ofp, "FRAME=%d\n", i+1);
                                if (!sum_images(argv[a], cvec, ofp))
                                        return(1);
                                if (ofspec != NULL) {
                                        if (fclose(ofp) == EOF) {
                                                fprintf(stderr,
                                                "%s: error writing to '%s'\n",
                                                        progname, fnbuf);
                                                return(1);
                                        }
                                        ofp = stdout;
                                }
                                cm_free(cvec);
                        }
                else if (!sum_images(argv[a], cmtx, ofp))
                        return(1);
        } else {                                /* generating vector/matrix */
                CMATRIX *Vmat = cm_load(argv[a], 0, cmtx->nrows, DTfromHeader);
                CMATRIX *rmtx = cm_multiply(Vmat, cmtx);
                cm_free(Vmat);
                if (ofspec != NULL) {           /* multiple vector files? */
                        const char      *wtype = (outfmt==DTascii) ? "w" : "wb";
                        for (i = 0; i < nsteps; i++) {
                                CMATRIX *rvec = cm_column(rmtx, i);
                                sprintf(fnbuf, ofspec, i+1);
                                if ((ofp = fopen(fnbuf, wtype)) == NULL) {
                                        fprintf(stderr,
                                        "%s: cannot open '%s' for output\n",
                                                        progname, fnbuf);
                                        return(1);
                                }
#ifdef getc_unlocked
                                flockfile(ofp);
#endif
                                if (headout) {  /* header output */
                                        newheader("RADIANCE", ofp);
                                        printargs(argc, argv, ofp);
                                        fputnow(ofp);
                                        fprintf(ofp, "FRAME=%d\n", i+1);
                                        fprintf(ofp, "NROWS=%d\n", rvec->nrows);
                                        fputs("NCOLS=1\nNCOMP=3\n", ofp);
                                        fputformat((char *)cm_fmt_id[outfmt], ofp);
                                        fputc('\n', ofp);
                                }
                                cm_write(rvec, outfmt, ofp);
                                if (fclose(ofp) == EOF) {
                                        fprintf(stderr,
                                                "%s: error writing to '%s'\n",
                                                        progname, fnbuf);
                                        return(1);
                                }
                                ofp = stdout;
                                cm_free(rvec);
                        }
                } else {
#ifdef getc_unlocked
                        flockfile(ofp);
#endif
                        if (outfmt != DTascii)
                                SET_FILE_BINARY(ofp);
                        if (headout) {          /* header output */
                                newheader("RADIANCE", ofp);
                                printargs(argc, argv, ofp);
                                fputnow(ofp);
                                fprintf(ofp, "NROWS=%d\n", rmtx->nrows);
                                fprintf(ofp, "NCOLS=%d\n", rmtx->ncols);
                                fputs("NCOMP=3\n", ofp);
                                fputformat((char *)cm_fmt_id[outfmt], ofp);
                                fputc('\n', ofp);
                        }
                        cm_write(rmtx, outfmt, ofp);
                }
                cm_free(rmtx);
        }
        if (fflush(ofp) == EOF) {               /* final clean-up */
                fprintf(stderr, "%s: write error on output\n", progname);
                return(1);
        }
        cm_free(cmtx);
        return(0);
userr:
        fprintf(stderr, "Usage: %s [-n nsteps][-o ospec][-i{f|d|h}][-o{f|d}] DCspec [skyf]\n",
                                progname);
        fprintf(stderr, "   or: %s [-n nsteps][-o ospec][-i{f|d|h}][-o{f|d}] Vspec Tbsdf Dmat.dat [skyf]\n",
                                progname);
        return(1);
}
Revision:	2.38
Committed:	Tue Apr 10 23:22:42 2018 UTC (6 years ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R2
Changes since 2.37:	+10 -6 lines
Log Message:	Improved speed on zero-valued pixels in summation
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.38	static const char RCSid[] = "$Id: dctimestep.c,v 2.37 2016/03/06 01:13:18 schorsch Exp $";
3	greg	2.1	#endif
4			/*
5			* Compute time-step result using Daylight Coefficient method.
6			*
7			* G. Ward
8			*/
9
10			#include <ctype.h>
11	schorsch	2.37	#include "platform.h"
12	greg	2.1	#include "standard.h"
13	greg	2.28	#include "cmatrix.h"
14	greg	2.1	#include "platform.h"
15			#include "resolu.h"
16
17			char progname; / global argv[0] */
18
19	greg	2.24	/* Sum together a set of images and write result to fout */
20	greg	2.1	static int
21	greg	2.13	sum_images(const char fspec, const CMATRIX cv, FILE *fout)
22	greg	2.1	{
23			int myDT = DTfromHeader;
24	greg	2.38	COLR *scanline = NULL;
25	greg	2.24	CMATRIX *pmat = NULL;
26			int myXR=0, myYR=0;
27	greg	2.1	int i, y;
28
29			if (cv->ncols != 1)
30	greg	2.35	error(INTERNAL, "expected vector in sum_images()");
31	greg	2.1	for (i = 0; i < cv->nrows; i++) {
32			const COLORV *scv = cv_lval(cv,i);
33			char fname[1024];
34			FILE *fp;
35			int dt, xr, yr;
36			COLORV *psp;
37	greg	2.31	char *err;
38	greg	2.14	/* check for zero */
39	greg	2.19	if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0) &&
40			(myDT != DTfromHeader) \| (i < cv->nrows-1))
41	greg	2.14	continue;
42	greg	2.1	/* open next picture */
43			sprintf(fname, fspec, i);
44	greg	2.31	if ((fp = fopen(fname, "rb")) == NULL) {
45	greg	2.1	sprintf(errmsg, "cannot open picture '%s'", fname);
46			error(SYSTEM, errmsg);
47			}
48	greg	2.31	dt = DTfromHeader;
49			if ((err = cm_getheader(&dt, NULL, NULL, fp)) != NULL)
50			error(USER, err);
51	greg	2.1	if ((dt != DTrgbe) & (dt != DTxyze) \|\|
52			!fscnresolu(&xr, &yr, fp)) {
53			sprintf(errmsg, "file '%s' not a picture", fname);
54			error(USER, errmsg);
55			}
56			if (myDT == DTfromHeader) { /* on first one */
57			myDT = dt;
58			myXR = xr; myYR = yr;
59	greg	2.38	scanline = (COLR )malloc(sizeof(COLR)myXR);
60	greg	2.1	if (scanline == NULL)
61			error(SYSTEM, "out of memory in sum_images()");
62			pmat = cm_alloc(myYR, myXR);
63			memset(pmat->cmem, 0, sizeof(COLOR)myXRmyYR);
64	greg	2.2	/* finish header */
65	greg	2.30	fputformat((char *)cm_fmt_id[myDT], fout);
66	greg	2.13	fputc('\n', fout);
67			fflush(fout);
68	greg	2.1	} else if ((dt != myDT) \| (xr != myXR) \| (yr != myYR)) {
69			sprintf(errmsg, "picture '%s' format/size mismatch",
70			fname);
71			error(USER, errmsg);
72			}
73			psp = pmat->cmem;
74			for (y = 0; y < yr; y++) { /* read it in */
75	greg	2.38	COLOR col;
76	greg	2.1	int x;
77	greg	2.38	if (freadcolrs(scanline, xr, fp) < 0) {
78	greg	2.1	sprintf(errmsg, "error reading picture '%s'",
79			fname);
80			error(SYSTEM, errmsg);
81			}
82			/* sum in scanline */
83			for (x = 0; x < xr; x++, psp += 3) {
84	greg	2.38	if (!scanline[x][EXP])
85			continue; /* skip zeroes */
86			colr_color(col, scanline[x]);
87			multcolor(col, scv);
88			addcolor(psp, col);
89	greg	2.1	}
90			}
91			fclose(fp); /* done this picture */
92			}
93			free(scanline);
94	greg	2.30	i = cm_write(pmat, myDT, fout); /* write picture */
95			cm_free(pmat); /* free data */
96			return(i);
97	greg	2.1	}
98
99	greg	2.11	/* check to see if a string contains a %d or %o specification */
100			static int
101			hasNumberFormat(const char *s)
102	greg	2.1	{
103	greg	2.24	if (s == NULL)
104			return(0);
105
106	greg	2.18	while (*s) {
107			while (*s != '%')
108			if (!*s++)
109			return(0);
110			if (++s == '%') { / ignore "%%" */
111			++s;
112			continue;
113			}
114			while (isdigit(s)) / field length */
115			++s;
116			/* field we'll use? */
117			if ((s == 'd') \| (s == 'i') \| (*s == 'o') \|
118			(s == 'x') \| (s == 'X'))
119			return(1);
120			}
121			return(0); /* didn't find one */
122	greg	2.1	}
123
124			int
125			main(int argc, char *argv[])
126			{
127	greg	2.34	int skyfmt = DTfromHeader;
128	greg	2.30	int outfmt = DTascii;
129	greg	2.34	int headout = 1;
130			int nsteps = 0;
131	greg	2.24	char *ofspec = NULL;
132			FILE *ofp = stdout;
133			CMATRIX cmtx; / component vector/matrix result */
134			char fnbuf[256];
135			int a, i;
136	greg	2.1
137			progname = argv[0];
138	greg	2.24	/* get options */
139	greg	2.25	for (a = 1; a < argc && argv[a][0] == '-'; a++)
140			switch (argv[a][1]) {
141	greg	2.24	case 'n':
142			nsteps = atoi(argv[++a]);
143	greg	2.31	if (nsteps < 0)
144	greg	2.24	goto userr;
145	greg	2.34	skyfmt = nsteps ? DTascii : DTfromHeader;
146			break;
147			case 'h':
148			headout = !headout;
149	greg	2.24	break;
150	greg	2.25	case 'i':
151			switch (argv[a][2]) {
152			case 'f':
153			skyfmt = DTfloat;
154			break;
155			case 'd':
156			skyfmt = DTdouble;
157			break;
158			case 'a':
159			skyfmt = DTascii;
160			break;
161			default:
162			goto userr;
163			}
164			break;
165	greg	2.30	case 'o':
166			switch (argv[a][2]) {
167			case '\0': /* output specification (not format) */
168			ofspec = argv[++a];
169			break;
170			case 'f':
171			outfmt = DTfloat;
172			break;
173			case 'd':
174			outfmt = DTdouble;
175			break;
176			case 'a':
177			outfmt = DTascii;
178			break;
179			default:
180			goto userr;
181			}
182			break;
183	greg	2.24	default:
184			goto userr;
185			}
186			if ((argc-a < 1) \| (argc-a > 4))
187			goto userr;
188	greg	2.1
189	greg	2.24	if (argc-a > 2) { /* VTDs expression */
190	greg	2.36	CMATRIX smtx, Dmat, Tmat, imtx;
191			const char *ccp;
192	greg	2.24	/* get sky vector/matrix */
193	greg	2.25	smtx = cm_load(argv[a+3], 0, nsteps, skyfmt);
194	greg	2.35	nsteps = smtx->ncols;
195	greg	2.12	/* load BSDF */
196	greg	2.36	if (argv[a+1][0] != '!' &&
197			(ccp = strrchr(argv[a+1], '.')) != NULL &&
198			!strcasecmp(ccp+1, "XML"))
199			Tmat = cm_loadBTDF(argv[a+1]);
200			else
201			Tmat = cm_load(argv[a+1], 0, 0, DTfromHeader);
202	greg	2.5	/* load Daylight matrix */
203	greg	2.36	Dmat = cm_load(argv[a+2], Tmat->ncols,
204	greg	2.24	smtx->nrows, DTfromHeader);
205	greg	2.1	/* multiply vector through */
206	greg	2.24	imtx = cm_multiply(Dmat, smtx);
207			cm_free(Dmat); cm_free(smtx);
208	greg	2.29	cmtx = cm_multiply(Tmat, imtx);
209			cm_free(Tmat);
210	greg	2.24	cm_free(imtx);
211			} else { /* sky vector/matrix only */
212	greg	2.25	cmtx = cm_load(argv[a+1], 0, nsteps, skyfmt);
213	greg	2.35	nsteps = cmtx->ncols;
214	greg	2.24	}
215			/* prepare output stream */
216			if ((ofspec != NULL) & (nsteps == 1) && hasNumberFormat(ofspec)) {
217			sprintf(fnbuf, ofspec, 1);
218			ofspec = fnbuf;
219			}
220			if (ofspec != NULL && !hasNumberFormat(ofspec)) {
221			if ((ofp = fopen(ofspec, "w")) == NULL) {
222			fprintf(stderr, "%s: cannot open '%s' for output\n",
223			progname, ofspec);
224			return(1);
225			}
226			ofspec = NULL; /* only need to open once */
227	greg	2.12	}
228	greg	2.24	if (hasNumberFormat(argv[a])) { /* generating image(s) */
229			if (ofspec == NULL) {
230			SET_FILE_BINARY(ofp);
231			newheader("RADIANCE", ofp);
232			printargs(argc, argv, ofp);
233			fputnow(ofp);
234			}
235			if (nsteps > 1) /* multiple output frames? */
236			for (i = 0; i < nsteps; i++) {
237			CMATRIX *cvec = cm_column(cmtx, i);
238			if (ofspec != NULL) {
239			sprintf(fnbuf, ofspec, i+1);
240			if ((ofp = fopen(fnbuf, "wb")) == NULL) {
241			fprintf(stderr,
242			"%s: cannot open '%s' for output\n",
243			progname, fnbuf);
244			return(1);
245			}
246			newheader("RADIANCE", ofp);
247			printargs(argc, argv, ofp);
248			fputnow(ofp);
249			}
250			fprintf(ofp, "FRAME=%d\n", i+1);
251			if (!sum_images(argv[a], cvec, ofp))
252			return(1);
253			if (ofspec != NULL) {
254			if (fclose(ofp) == EOF) {
255			fprintf(stderr,
256			"%s: error writing to '%s'\n",
257			progname, fnbuf);
258			return(1);
259			}
260			ofp = stdout;
261			}
262			cm_free(cvec);
263			}
264			else if (!sum_images(argv[a], cmtx, ofp))
265	greg	2.1	return(1);
266	greg	2.24	} else { /* generating vector/matrix */
267			CMATRIX *Vmat = cm_load(argv[a], 0, cmtx->nrows, DTfromHeader);
268			CMATRIX *rmtx = cm_multiply(Vmat, cmtx);
269	greg	2.1	cm_free(Vmat);
270	greg	2.30	if (ofspec != NULL) { /* multiple vector files? */
271			const char *wtype = (outfmt==DTascii) ? "w" : "wb";
272	greg	2.24	for (i = 0; i < nsteps; i++) {
273			CMATRIX *rvec = cm_column(rmtx, i);
274			sprintf(fnbuf, ofspec, i+1);
275	greg	2.30	if ((ofp = fopen(fnbuf, wtype)) == NULL) {
276	greg	2.24	fprintf(stderr,
277			"%s: cannot open '%s' for output\n",
278			progname, fnbuf);
279			return(1);
280			}
281	greg	2.31	#ifdef getc_unlocked
282			flockfile(ofp);
283			#endif
284	greg	2.34	if (headout) { /* header output */
285			newheader("RADIANCE", ofp);
286			printargs(argc, argv, ofp);
287			fputnow(ofp);
288			fprintf(ofp, "FRAME=%d\n", i+1);
289			fprintf(ofp, "NROWS=%d\n", rvec->nrows);
290			fputs("NCOLS=1\nNCOMP=3\n", ofp);
291			fputformat((char *)cm_fmt_id[outfmt], ofp);
292			fputc('\n', ofp);
293			}
294	greg	2.30	cm_write(rvec, outfmt, ofp);
295	greg	2.24	if (fclose(ofp) == EOF) {
296			fprintf(stderr,
297			"%s: error writing to '%s'\n",
298			progname, fnbuf);
299			return(1);
300			}
301			ofp = stdout;
302			cm_free(rvec);
303			}
304	greg	2.30	} else {
305	greg	2.31	#ifdef getc_unlocked
306			flockfile(ofp);
307			#endif
308	greg	2.30	if (outfmt != DTascii)
309			SET_FILE_BINARY(ofp);
310	greg	2.34	if (headout) { /* header output */
311	greg	2.30	newheader("RADIANCE", ofp);
312			printargs(argc, argv, ofp);
313			fputnow(ofp);
314	greg	2.33	fprintf(ofp, "NROWS=%d\n", rmtx->nrows);
315	greg	2.31	fprintf(ofp, "NCOLS=%d\n", rmtx->ncols);
316			fputs("NCOMP=3\n", ofp);
317	greg	2.30	fputformat((char *)cm_fmt_id[outfmt], ofp);
318			fputc('\n', ofp);
319			}
320			cm_write(rmtx, outfmt, ofp);
321			}
322	greg	2.24	cm_free(rmtx);
323			}
324			if (fflush(ofp) == EOF) { /* final clean-up */
325			fprintf(stderr, "%s: write error on output\n", progname);
326			return(1);
327	greg	2.1	}
328	greg	2.24	cm_free(cmtx);
329	greg	2.1	return(0);
330	greg	2.24	userr:
331	greg	2.32	fprintf(stderr, "Usage: %s [-n nsteps][-o ospec][-i{f\|d\|h}][-o{f\|d}] DCspec [skyf]\n",
332	greg	2.24	progname);
333	greg	2.36	fprintf(stderr, " or: %s [-n nsteps][-o ospec][-i{f\|d\|h}][-o{f\|d}] Vspec Tbsdf Dmat.dat [skyf]\n",
334	greg	2.24	progname);
335			return(1);
336	greg	2.1	}