+ diagonal filter

Fonderie/crapulator.c

@@ -97,9 +97,19 @@ FimgFilter3x3	hipass = {
 	1.0,	0.0
 	};
 
+FimgFilter3x3	diagonal = {
+		{
+		2.0,	1.0,	0.0,
+		1.0,	0.0,	-1.0,
+		0.0,	-1.0,	-2.0,
+		},
+	1.0,	0.0
+	};
+
 switch (typef) {
 	case 0:		pfiltre = &lowpass;		break;
 	case 1:		pfiltre = &hipass;		break;
+	case 2:		pfiltre = &diagonal;		break;
 	default:
 		fprintf(stderr, "%s: bad filter number %d\n",
 				__func__, typef);
@@ -114,7 +124,9 @@ if (retval) {
 	fprintf(stderr, "%s error %d on filter\n", __func__, retval);
 	exit(1);
 	}
-fimg_killborders(&img);		/* XXX WTF OMG */
+/*
+ *	may be, here, we can check for negative values ? */
+fimg_killborders(&img);
 fimg_copy_data(&img, pimg);
 fimg_destroy(&img);
 
@@ -220,6 +232,9 @@ switch (idFx) {
 				/* hipass filter */
 		retval = insitu_filtre3x3(image, 1);
 		break;
+	case CR_diagonal:
+		retval = insitu_filtre3x3(image, 2);
+		break;
 	case CR_octotree:
 		retval = octotree_classif(image, 0.500, 0);
 		break;