- Grob *g = (*elements)[i];
- Skyline_pair skylines;
-
- if (!pure)
- {
- Skyline_pair *skys = Skyline_pair::unsmob (g->get_property (a == Y_AXIS
- ? "vertical-skylines"
- : "horizontal-skylines"));
- if (skys)
- skylines = *skys;
-
- /* This skyline was calculated relative to the grob g. In order to compare it to
- skylines belonging to other grobs, we need to shift it so that it is relative
- to the common reference. */
- Real offset = g->relative_coordinate (other_common, other_axis (a));
- skylines.shift (offset);
- }
- else
- {
- assert (a == Y_AXIS);
- Interval extent = g->pure_height (g, start, end);
-
- // This is a hack to get better accuracy on the pure-height of VerticalAlignment.
- // It's quite common for a treble clef to be the highest element of one system
- // and for a low note (or lyrics) to be the lowest note on another. The two will
- // never collide, but the pure-height stuff only works with bounding boxes, so it
- // doesn't know that. The result is a significant over-estimation of the pure-height,
- // especially on systems with many staves. To correct for this, we build a skyline
- // in two parts: the part we did above contains most of the grobs (note-heads, etc.)
- // while the bit we're about to do only contains the breakable grobs at the beginning
- // of the system. This way, the tall treble clefs are only compared with the treble
- // clefs of the other staff and they will be ignored if the staff above is, for example,
- // lyrics.
- if (Axis_group_interface::has_interface (g)
- && !Hara_kiri_group_spanner::request_suicide (g, start, end))
- {
- extent = Axis_group_interface::rest_of_line_pure_height (g, start, end);
- Interval begin_of_line_extent = Axis_group_interface::begin_of_line_pure_height (g, start);
- if (!begin_of_line_extent.is_empty ())
- {
- Box b;
- b[a] = begin_of_line_extent;
- b[other_axis (a)] = Interval (-infinity_f, -1);
- skylines.insert (b, 0, other_axis (a));
- }
- }
-
- if (!extent.is_empty ())
- {
- Box b;
- b[a] = extent;
- b[other_axis (a)] = Interval (0, infinity_f);
- skylines.insert (b, 0, other_axis (a));
- }
- }
-
- if (skylines.is_empty ())
- elements->erase (elements->begin () + i);
- else
- ret->push_back (skylines);
+ Skyline_pair *skys = Skyline_pair::unsmob (g->get_property (a == Y_AXIS
+ ? "vertical-skylines"
+ : "horizontal-skylines"));
+ if (skys)
+ skylines = *skys;
+
+ /* This skyline was calculated relative to the grob g. In order to compare it to
+ skylines belonging to other grobs, we need to shift it so that it is relative
+ to the common reference. */
+ Real offset = g->relative_coordinate (other_common, other_axis (a));
+ skylines.shift (offset);