big commit for 2 new funcs

funcs/geometry.c

@@ -0,0 +1,56 @@
+/*
+ *		FLOATIMG
+ *	distorsions géométriques - coredumping ?
+ */
+
+#include  <stdio.h>
+
+#include  "../floatimg.h"
+
+/* --------------------------------------------------------------------- */
+/*
+ *	really crude function, need more work...
+ */
+int fimg_halfsize_0(FloatImg *src, FloatImg *dst, int notused)
+{
+int		wd, hd;
+int		foo, x, y;
+float		pixel[3];
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__,
+			src, dst, notused);
+#endif
+
+			/* no magic check here ? */
+if (dst->width || dst->height) {
+	fprintf(stderr, "*** %s: image at %p not empty\n", __func__, dst);
+	fimg_describe(dst, "destination halfsize");
+	return -2;
+	}
+
+wd = src->width / 2;	hd = src->height / 2;
+foo = fimg_create(dst, wd, hd, FIMG_TYPE_RGB);
+if (foo) {
+	fprintf(stderr, "%s: err create %d\n", __func__, foo);
+	return -3;
+	}
+
+for (y=0; y<hd; y++) {
+	for (x=0; x<wd; x++) {
+		foo = fimg_get_rgb(src, x*2, y*2, pixel);
+		if (foo) {
+			fprintf(stderr, "%s: err get %d\n", foo);
+			abort();
+			}
+		foo = fimg_plot_rgb(dst, x, y, pixel[0], pixel[1], pixel[2]);
+		if (foo) {
+			fprintf(stderr, "%s: err plot %d\n", foo);
+			abort();
+			}
+		}
+
+	}
+return 0;
+}
+/* --------------------------------------------------------------------- */