-Interval
-Axis_group_interface::cached_pure_height (Grob *me,
- vector<Grob*> const &elts,
- Grob *common,
- int start, int end)
-{
- Paper_score *ps = get_root_system (me)->paper_score ();
- vector<vsize> breaks = ps->get_break_indices ();
- vector<Grob*> cols = ps->get_columns ();
- vsize start_index = VPOS;
- vsize end_index = VPOS;
-
- for (vsize i = 0; i < breaks.size (); i++)
- {
- int r = Paper_column::get_rank (cols[breaks[i]]);
- if (start == r)
- start_index = i;
- if (end == r)
- end_index = i;
- }
-
- if (start_index == VPOS || end_index == VPOS)
- {
- programming_error (_ ("tried to calculate pure-height at a non-breakpoint"));
- return Interval (0, 0);
- }
-
- SCM extents = me->get_property ("cached-pure-extents");
- if (!scm_is_vector (extents))
- {
- extents = scm_c_make_vector (breaks.size () - 1, SCM_EOL);
- for (vsize i = 0; i < breaks.size () - 1; i++)
- {
- int st = Paper_column::get_rank (cols[breaks[i]]);
- int ed = Paper_column::get_rank (cols[breaks[i+1]]);
- Interval iv = relative_pure_height (me, elts, common, st, ed, false);
- scm_vector_set_x (extents, scm_from_int (i), ly_interval2scm (iv));
- }
- me->set_property ("cached-pure-extents", extents);
- }
-
- Interval ext (0, 0);
- for (vsize i = start_index; i < end_index; i++)
- ext.unite (ly_scm2interval (scm_c_vector_ref (extents, i)));
- return ext;
-}
-
-Interval
-Axis_group_interface::relative_pure_height (Grob *me,
- vector<Grob*> const &elts,
- Grob *common,
- int start, int end,
- bool use_cache)
-{
- /* It saves a _lot_ of time if we assume a VerticalAxisGroup is additive
- (ie. height (i, k) = height (i, j) + height (j, k) for all i <= j <= k).
- Unfortunately, it isn't always true, particularly if there is a
- VerticalAlignment somewhere in the descendants.
-
- Apart from PianoStaff, which has a fixed VerticalAlignment so it doesn't
- count, the only VerticalAlignment comes from Score. This makes it
- reasonably safe to assume that if our parent is a VerticalAlignment,
- we can assume additivity and cache things nicely. */
- Grob *p = me->get_parent (Y_AXIS);
- if (use_cache && p && Align_interface::has_interface (p))
- return Axis_group_interface::cached_pure_height (me, elts, common, start, end);
-
- Interval r;
-
- for (vsize i = 0; i < elts.size (); i++)
- {
- Interval_t<int> rank_span = elts[i]->spanned_rank_iv ();
- Item *it = dynamic_cast<Item*> (elts[i]);
- if (rank_span[LEFT] <= end && rank_span[RIGHT] >= start && (!it || it->pure_is_visible (start, end)))
- {
- Interval dims = elts[i]->pure_height (common, start, end);
- if (!dims.is_empty ())
- r.unite (dims);
- }
- }
- return r;
-}
-