X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Frest.cc;h=22420f54f4def9528dbccb739288d5ca8ade0727;hb=c423fa1e62d3060b592ea9e56c841649b8504d8b;hp=1abb770d7b307a7150e22ed90be2f746e5124400;hpb=ac6c83f047635535d0481a15654c13e776334dc6;p=lilypond.git

diff --git a/lily/rest.cc b/lily/rest.cc
index 1abb770d7b..22420f54f4 100644
--- a/lily/rest.cc
+++ b/lily/rest.cc
@@ -46,6 +46,22 @@ Rest::y_offset_callback (SCM smob)
   return scm_from_double (amount);
 }
 
+/* A rest might lie under a beam, in which case it should be cross-staff if
+   the beam is cross-staff because the rest's position depends on the
+   formatting of the beam. */
+MAKE_SCHEME_CALLBACK (Rest, calc_cross_staff, 1);
+SCM
+Rest::calc_cross_staff (SCM smob)
+{
+  Grob *me = unsmob_grob (smob);
+  Grob *stem = unsmob_grob (me->get_object ("stem"));
+
+  if (!stem)
+    return SCM_BOOL_F;
+
+  return stem->get_property ("cross-staff");
+}
+
 /*
   make this function easily usable in C++
 */