--- ray/src/util/dctimestep.c	2018/04/10 23:22:42	2.38
+++ ray/src/util/dctimestep.c	2020/03/25 01:51:09	2.45
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: dctimestep.c,v 2.38 2018/04/10 23:22:42 greg Exp $";
+static const char RCSid[] = "$Id: dctimestep.c,v 2.45 2020/03/25 01:51:09 greg Exp $";
 #endif
 /*
  * Compute time-step result using Daylight Coefficient method.
@@ -30,8 +30,10 @@ sum_images(const char *fspec, const CMATRIX *cv, FILE 
 		error(INTERNAL, "expected vector in sum_images()");
 	for (i = 0; i < cv->nrows; i++) {
 		const COLORV	*scv = cv_lval(cv,i);
+		int		flat_file = 0;
 		char		fname[1024];
 		FILE		*fp;
+		long		data_start;
 		int		dt, xr, yr;
 		COLORV		*psp;
 		char		*err;
@@ -46,7 +48,7 @@ sum_images(const char *fspec, const CMATRIX *cv, FILE 
 			error(SYSTEM, errmsg);
 		}
 		dt = DTfromHeader;
-		if ((err = cm_getheader(&dt, NULL, NULL, fp)) != NULL)
+		if ((err = cm_getheader(&dt, NULL, NULL, NULL, NULL, fp)) != NULL)
 			error(USER, err);
 		if ((dt != DTrgbe) & (dt != DTxyze) ||
 				!fscnresolu(&xr, &yr, fp)) {
@@ -70,11 +72,20 @@ sum_images(const char *fspec, const CMATRIX *cv, FILE 
 					fname);
 			error(USER, errmsg);
 		}
+							/* flat file check */
+		if ((data_start = ftell(fp)) > 0 && fseek(fp, 0L, SEEK_END) == 0) {
+			flat_file = (ftell(fp) == data_start + sizeof(COLR)*xr*yr);
+			if (fseek(fp, data_start, SEEK_SET) < 0) {
+				sprintf(errmsg, "cannot seek on picture '%s'", fname);
+				error(SYSTEM, errmsg);
+			}
+		}
 		psp = pmat->cmem;
 		for (y = 0; y < yr; y++) {		/* read it in */
 			COLOR	col;
 			int	x;
-			if (freadcolrs(scanline, xr, fp) < 0) {
+			if (flat_file ? getbinary(scanline, sizeof(COLR), xr, fp) != xr :
+					freadcolrs(scanline, xr, fp) < 0) {
 				sprintf(errmsg, "error reading picture '%s'",
 						fname);
 				error(SYSTEM, errmsg);
@@ -176,6 +187,9 @@ main(int argc, char *argv[])
 			case 'a':
 				outfmt = DTascii;
 				break;
+			case 'c':
+				outfmt = DTrgbe;
+				break;
 			default:
 				goto userr;
 			}
@@ -226,6 +240,10 @@ main(int argc, char *argv[])
 		ofspec = NULL;			/* only need to open once */
 	}
 	if (hasNumberFormat(argv[a])) {		/* generating image(s) */
+		if (outfmt != DTrgbe) {
+			error(WARNING, "changing output type to -oc");
+			outfmt = DTrgbe;
+		}
 		if (ofspec == NULL) {
 			SET_FILE_BINARY(ofp);
 			newheader("RADIANCE", ofp);
@@ -236,7 +254,7 @@ main(int argc, char *argv[])
 			for (i = 0; i < nsteps; i++) {
 				CMATRIX	*cvec = cm_column(cmtx, i);
 				if (ofspec != NULL) {
-					sprintf(fnbuf, ofspec, i+1);
+					sprintf(fnbuf, ofspec, i);
 					if ((ofp = fopen(fnbuf, "wb")) == NULL) {
 						fprintf(stderr,
 					"%s: cannot open '%s' for output\n",
@@ -247,7 +265,7 @@ main(int argc, char *argv[])
 					printargs(argc, argv, ofp);
 					fputnow(ofp);
 				}
-				fprintf(ofp, "FRAME=%d\n", i+1);
+				fprintf(ofp, "FRAME=%d\n", i);
 				if (!sum_images(argv[a], cvec, ofp))
 					return(1);
 				if (ofspec != NULL) {
@@ -271,7 +289,7 @@ main(int argc, char *argv[])
 			const char	*wtype = (outfmt==DTascii) ? "w" : "wb";
 			for (i = 0; i < nsteps; i++) {
 				CMATRIX	*rvec = cm_column(rmtx, i);
-				sprintf(fnbuf, ofspec, i+1);
+				sprintf(fnbuf, ofspec, i);
 				if ((ofp = fopen(fnbuf, wtype)) == NULL) {
 					fprintf(stderr,
 					"%s: cannot open '%s' for output\n",
@@ -285,9 +303,11 @@ main(int argc, char *argv[])
 					newheader("RADIANCE", ofp);
 					printargs(argc, argv, ofp);
 					fputnow(ofp);
-					fprintf(ofp, "FRAME=%d\n", i+1);
+					fprintf(ofp, "FRAME=%d\n", i);
 					fprintf(ofp, "NROWS=%d\n", rvec->nrows);
 					fputs("NCOLS=1\nNCOMP=3\n", ofp);
+					if ((outfmt == 'f') | (outfmt == 'd'))
+						fputendian(ofp);
 					fputformat((char *)cm_fmt_id[outfmt], ofp);
 					fputc('\n', ofp);
 				}
@@ -314,6 +334,8 @@ main(int argc, char *argv[])
 				fprintf(ofp, "NROWS=%d\n", rmtx->nrows);
 				fprintf(ofp, "NCOLS=%d\n", rmtx->ncols);
 				fputs("NCOMP=3\n", ofp);
+				if ((outfmt == 'f') | (outfmt == 'd'))
+					fputendian(ofp);
 				fputformat((char *)cm_fmt_id[outfmt], ofp);
 				fputc('\n', ofp);
 			}
@@ -328,9 +350,9 @@ main(int argc, char *argv[])
 	cm_free(cmtx);
 	return(0);
 userr:
-	fprintf(stderr, "Usage: %s [-n nsteps][-o ospec][-i{f|d|h}][-o{f|d}] DCspec [skyf]\n",
+	fprintf(stderr, "Usage: %s [-n nsteps][-o ospec][-i{f|d|h}][-o{f|d|c}] 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",
+	fprintf(stderr, "   or: %s [-n nsteps][-o ospec][-i{f|d|h}][-o{f|d|c}] Vspec Tbsdf Dmat.dat [skyf]\n",
 				progname);
 	return(1);
 }