big commit for 2 new funcs

funcs/t.c

@@ -10,8 +10,37 @@
 
 int		verbosity;
 
-int fimg_killcolors_a(FloatImg *fimg, float fval);
+/* --------------------------------------------------------------------- */
+int essai_geometrie(char *infile)
+{
+FloatImg	fimg, result;
+int		foo;
 
+if (NULL != infile) {
+	fprintf(stderr, "loading %s\n", infile);
+	fimg_create_from_dump(infile, &fimg);
+	}
+else	{
+	fimg_create(&fimg, 512, 512, FIMG_TYPE_RGB);
+	fimg_draw_something(&fimg);
+	}
+
+foo = fimg_save_as_pnm(&fimg, "source.pnm", 0);
+
+memset(&result, 0, sizeof(FloatImg));
+
+foo = fimg_halfsize_0(&fimg, &result, 0);
+fprintf(stderr, "retour halfsize -> %d\n", foo);
+if (foo) {
+	return -2;
+	}
+
+fimg_describe(&result, "result after halfsize");
+
+foo = fimg_save_as_pnm(&result, "something.pnm", 0);
+
+return 0;
+}
 /* --------------------------------------------------------------------- */
 int essai_sfx0(char *infile)
 {
@@ -134,7 +163,7 @@ int		foo;
 
 puts("++++++++++++++++++++++++++++++++");
 
-foo = essai_sfx0("03384.fimg");
+foo = essai_geometrie("foo.fimg");
 
 return 0;
 }