+ {
+ /* if start and end point are almost identical, the flatness tests
+ * don't work properly, so fall back on testing whether both of
+ * the other two control points are the same as the start point,
+ * too.
+ */
+ if (hypot(x1 - x0, y1 - y0) < 0.001
+ && hypot(x2 - x0, y2 - y0) < 0.001)
+ goto nosubdivide;
+ else
+ goto subdivide;
+ }