be negative ans reverse the sort

Fonderie/interpolator.c

@@ -33,9 +33,14 @@ typedef struct {
 	float		value;		/* from metric analyse     */
 	} IdxValue;
 
+static int	negative = 0;
+
 static int cmp_idxvalues(const void *pa, const void *pb)
 {
-return ( ((IdxValue *)pa)->value > ((IdxValue *)pb)->value);
+if (negative)
+	return ( ((IdxValue *)pa)->value < ((IdxValue *)pb)->value);
+else
+	return ( ((IdxValue *)pa)->value > ((IdxValue *)pb)->value);
 }
 
 int tentative_triage(glob_t *ptr_glob, IdxValue **ptr_idxval,
@@ -123,6 +128,8 @@ IdxValue	*idx_values;			/* gni? */
 fprintf(stderr, "  interpolate from '%s' to '%s' with %d steps.\n",
 			pattern, outdir, Nsteps);
 
+if (negative) fprintf(stderr, "%s: negative on\n", __func__);
+
 memset(&globbuf, 0, sizeof(glob_t));
 foo = glob(pattern, 0, NULL, &globbuf);
 fprintf(stderr, "globbing '%s' -> %d, %d files found\n",
@@ -146,13 +153,6 @@ if (FIMG_TYPE_RGB != iarray[2]) {
 	exit(1);	/* BLAM! */
 	}
 
-#if 0
-if (infx)		fprintf(stderr, "\tin  fx  #%d\n", infx);
-else			fprintf(stderr, "\tno in fx\n");
-if (outfx)		fprintf(stderr, "\tout fx  #%d\n", outfx);
-else			fprintf(stderr, "\tno out fx\n");
-#endif
-
 w = iarray[0], h = iarray[1];
 fprintf(stderr, "first image size : %dx%d\n", w, h);
 
@@ -232,12 +232,11 @@ puts("usage:\n\tinterpolator [options] <inglob> <outdir> <nbsteep>");
  *	the options of 'fonderie' software ?
  */
 puts("options:");
-puts("\t-S nn\t\tmysterious sort");
 puts("\t-E i:bla:k\tinput  filter chain");
 puts("\t-F name:j\toutput filter chain");
+puts("\t-n\t\tmake negative");
+puts("\t-S nn\t\tmysterious sort");
 puts("\t-L\t\tlist available filters");
-// OBSOLETE puts("\t-w nn\t\tinput effect");
-// OBSOLETE puts("\t-x nn\t\toutput effect");
 puts("\t-v\t\tincrease verbosity");
 
 if (verbosity) {
@@ -268,7 +267,7 @@ for (foo=0; foo<argc; foo++)
 	fprintf(stderr, "%5d     %s\n", foo, argv[foo]);
 #endif
 
-while ((opt = getopt(argc, argv, "E:F:hLS:vw:x:")) != -1) {
+while ((opt = getopt(argc, argv, "E:F:hLnS:v")) != -1) {
 	switch(opt) {
 		case 'E':	InFchain = optarg;	break;
 		case 'F':	OutFchain = optarg;	break;
@@ -278,8 +277,7 @@ while ((opt = getopt(argc, argv, "E:F:hLS:vw:x:")) != -1) {
 			exit(0);
 		case 'S':	sort = atoi(optarg);	break;
 		case 'v':	verbosity++;		break;
-// OBSOLETE 	case 'w':	inFx = atoi(optarg);	break;
-// OBSOLETE 	case 'x':	outFx = atoi(optarg);	break;
+		case 'n':	negative = 1;		break;
 		}
 	}