Gets vertical skylines from grob stencils

lily/include/grob.hh

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 1996--2012 Han-Wen Nienhuys
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
@@ skipping 54 matching lines @@
   friend SCM ly_grob_basic_properties (SCM);
 
   /* standard callbacks */
   DECLARE_SCHEME_CALLBACK (x_parent_positioning, (SCM));
   DECLARE_SCHEME_CALLBACK (y_parent_positioning, (SCM));
   DECLARE_SCHEME_CALLBACK (stencil_height, (SCM smob));
   DECLARE_SCHEME_CALLBACK (stencil_width, (SCM smob));
   DECLARE_SCHEME_CALLBACK (simple_vertical_skylines_from_stencil, (SCM smob));
   DECLARE_SCHEME_CALLBACK (vertical_skylines_from_stencil, (SCM smob));
   DECLARE_SCHEME_CALLBACK (vertical_skylines_from_element_stencils, (SCM smob));
+  DECLARE_SCHEME_CALLBACK (simple_horizontal_skylines_from_stencil, (SCM smob));
+  DECLARE_SCHEME_CALLBACK (horizontal_skylines_from_stencil, (SCM smob));
+  DECLARE_SCHEME_CALLBACK (horizontal_skylines_from_element_stencils, (SCM smob));
 
   /* R/O access */
   Output_def *layout () const { return layout_; }
   Grob *original () const { return original_; }
   SCM interfaces () const { return interfaces_; }
 
   /* life & death */
   Grob (SCM basic_props);
   Grob (Grob const &);
   virtual Grob *clone () const;
@@ skipping 59 matching lines @@
   void fixup_refpoint ();
 
   /* vertical ordering */
   static bool internal_vertical_less (Grob *g1, Grob *g2, bool pure);
   static Grob *get_root_vertical_alignment (Grob *g);
   static Grob *get_vertical_axis_group (Grob *g);
   static bool vertical_less (Grob *g1, Grob *g2);
   static bool pure_vertical_less (Grob *g1, Grob *g2);
   static int get_vertical_axis_group_index (Grob *g);
 
-  /* vertical skylines */
+  /* skylines */
   virtual Interval_t<int> spanned_rank_interval () const;
   virtual bool pure_is_visible (int start, int end) const;
   bool check_cross_staff (Grob *common);
   static bool less (Grob *g1, Grob *g2);
+  static SCM internal_simple_skylines_from_stencil (SCM, Axis);
+  static SCM internal_skylines_from_element_stencils (SCM, Axis);
 };
 
 /* smob utilities */
 DECLARE_UNSMOB (Grob, grob);
 Spanner *unsmob_spanner (SCM);
 Item *unsmob_item (SCM);
 
 /* refpoints */
 Grob *common_refpoint_of_list (SCM elt_list, Grob *, Axis a);
 Grob *common_refpoint_of_array (vector<Grob *> const &, Grob *, Axis a);
 System *get_root_system (Grob *me);
 
 /* extents */
 Interval robust_relative_extent (Grob *, Grob *, Axis);
 
 /* offset/extent callbacks. */
 void add_offset_callback (Grob *g, SCM proc, Axis a);
 void chain_offset_callback (Grob *g, SCM proc, Axis a);
 void chain_callback (Grob *g, SCM proc, SCM sym);
 SCM axis_offset_symbol (Axis a);
 SCM axis_parent_positioning (Axis a);
 
 SCM call_pure_function (SCM unpure, SCM args, int start, int end);
 
 void set_nested_property (Grob *, SCM property_path, SCM value);
 
 #endif /* GROB_HH */