+ scm_to_double (blot)).smobbed_copy ();
+}
+
+LY_DEFINE (ly_round_filled_polygon, "ly:round-filled-polygon",
+ 2, 0, 0,
+ (SCM points, SCM blot),
+ "Make a @code{Stencil} object that prints a black polygon with"
+ " corners at the points defined by @var{points} (list of coordinate"
+ " pairs) and roundness @var{blot}.")
+{
+ SCM_ASSERT_TYPE (scm_ilength (points) > 0, points, SCM_ARG1, __FUNCTION__, "list of coordinate pairs");
+ LY_ASSERT_TYPE (scm_is_number, blot, 2);
+ vector<Offset> pts;
+ for (SCM p = points; scm_is_pair (p); p = scm_cdr (p))
+ {
+ SCM scm_pt = scm_car (p);
+ if (scm_is_pair (scm_pt))
+ {
+ pts.push_back (ly_scm2offset (scm_pt));
+ }
+ else
+ {
+ // TODO: Print out warning
+ }
+ }
+ return Lookup::round_filled_polygon (pts, scm_to_double (blot)).smobbed_copy ();
+}
+
+LY_DEFINE (ly_register_stencil_expression, "ly:register-stencil-expression",
+ 1, 0, 0,
+ (SCM symbol),
+ "Add @var{symbol} as head of a stencil expression.")
+{
+ LY_ASSERT_TYPE (ly_is_symbol, symbol, 1);
+ register_stencil_head (symbol);
+ return SCM_UNSPECIFIED;