(c) 2006--2007 Joe Neeman <joeneeman@gmail.com>
*/
+#include "international.hh"
#include "optimal-page-breaking.hh"
#include "output-def.hh"
#include "page-spacing.hh"
Optimal_page_breaking::solve ()
{
vsize end = breaks_.size () - 1;
- vsize min_sys_count = min_system_count (0, end);
+ vsize min_sys_count = 0;
+ vsize ideal_sys_count = 0;
vsize max_sys_count = max_system_count (0, end);
- vsize max_page_count = INT_MAX;
- vsize cur_page_count = 0;
- Spacing_result best;
+ vsize page_count = 0;
+ Line_division ideal_line_division;
Line_division best_division;
- Line_division lower_bound;
+ Line_division bound;
vsize first_page_num = robust_scm2int (book_->paper_->c_variable ("first-page-number"), 1);
- for (vsize sys_count = min_sys_count;
- cur_page_count <= max_page_count && sys_count <= max_sys_count;
- sys_count++)
+ /* find out the ideal number of pages */
+ message (_ ("Finding the ideal number of pages..."));
+ set_to_ideal_line_configuration (0, end);
+ ideal_line_division = current_configuration (0);
+
+ Spacing_result best = space_systems_on_best_pages (0, first_page_num);
+ page_count = best.systems_per_page_.size ();
+ best_division = ideal_line_division;
+
+ for (vsize i = 0; i < page_count; i++)
+ ideal_sys_count += best.systems_per_page_[i];
+
+ min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
+ if (page_count > 1)
+ min_sys_count -= best.systems_per_page_[page_count - 2];
+
+ message (_f ("Fitting music on %d (or one fewer) pages...", (int)page_count));
+ /* try a smaller number of systems than the ideal number for line breaking */
+ bound = ideal_line_division;
+ for (vsize sys_count = ideal_sys_count; --sys_count >= min_sys_count;)
+ {
+ Spacing_result best_for_this_sys_count;
+ set_current_breakpoints (0, end, sys_count, Line_division (), bound);
+
+ for (vsize i = 0; i < current_configuration_count (); i++)
+ {
+ vsize min_p_count = min_page_count (i, first_page_num);
+ Spacing_result cur;
+
+ if (min_p_count > page_count)
+ continue;
+ else if (min_p_count == page_count)
+ cur = space_systems_on_n_pages (i, page_count, first_page_num);
+ else
+ cur = space_systems_on_n_or_one_more_pages (i, page_count-1, first_page_num);
+
+ if (cur.demerits_ < best_for_this_sys_count.demerits_ || isinf (best_for_this_sys_count.demerits_))
+ {
+ best_for_this_sys_count = cur;
+ bound = current_configuration (i);
+ }
+ }
+
+ if (best_for_this_sys_count.demerits_ < best.demerits_ || isinf (best.demerits_))
+ {
+ best = best_for_this_sys_count;
+ best_division = bound;
+ }
+
+ if (best_for_this_sys_count.systems_per_page_.size () < page_count)
+ {
+ /* if the pages are stretched on average, stop trying to reduce sys_count */
+ Real avg_f = 0;
+ for (vsize i = 0; i < best_for_this_sys_count.systems_per_page_.size (); i++)
+ avg_f += best_for_this_sys_count.systems_per_page_[i];
+ if (avg_f > 0)
+ break;
+ }
+
+ if (isinf (best_for_this_sys_count.demerits_))
+ break;
+ }
+
+ /* try a larger number of systems than the ideal line breaking number. This
+ is more or less C&P, but the loop bounds make it difficult to try something
+ like do {...} while (flip(&d) != UP). */
+ bound = ideal_line_division;
+ for (vsize sys_count = ideal_sys_count+1; sys_count <= max_sys_count; sys_count++)
{
Real best_demerits_for_this_sys_count = infinity_f;
- set_current_breakpoints (0, end, sys_count, lower_bound);
+ set_current_breakpoints (0, end, sys_count, bound);
for (vsize i = 0; i < current_configuration_count (); i++)
{
- Spacing_result cur = space_systems_on_best_pages (i, first_page_num);
- cur_page_count = cur.systems_per_page_.size ();
+ vsize min_p_count = min_page_count (i, first_page_num);
+ Spacing_result cur;
+
+ if (min_p_count > page_count)
+ continue;
+ else
+ cur = space_systems_on_n_pages (i, page_count, first_page_num);
+
if (cur.demerits_ < best.demerits_ || isinf (best.demerits_))
{
best = cur;
best_division = current_configuration (i);
}
- if (cur.demerits_ < best_demerits_for_this_sys_count || isinf (best.demerits_))
+ if (cur.demerits_ < best_demerits_for_this_sys_count || isinf (best_demerits_for_this_sys_count))
{
best_demerits_for_this_sys_count = cur.demerits_;
- lower_bound = current_configuration (i);
+ bound = current_configuration (i);
}
-
- if (all_lines_stretched (i))
- max_page_count = min (max_page_count, cur_page_count + 1);
}
+ if (isinf (best_demerits_for_this_sys_count))
+ break;
}
+ message ("Drawing systems...");
break_into_pieces (0, end, best_division);
SCM lines = systems ();
return make_pages (best.systems_per_page_, lines);
lower_bound,
upper_bound,
&work_in_progress);
+
+ /* we only consider a constant number of configurations. Otherwise,
+ this becomes slow when there are many small scores. The constant
+ 5 is somewhat arbitrary. */
+ if (current_configurations_.size () > 5)
+ {
+ vector<pair<Real,vsize> > dems_and_indices;
+
+ for (vsize i = 0; i < current_configurations_.size (); i++)
+ {
+ cache_line_details (i);
+ Real dem = 0;
+ for (vsize j = 0; j < cached_line_details_.size (); j++)
+ dem += cached_line_details_[j].force_ * cached_line_details_[j].force_
+ + cached_line_details_[j].break_penalty_;
+
+ dems_and_indices.push_back (pair<Real,vsize> (dem, i));
+ }
+ vector_sort (dems_and_indices, less<pair<Real,vsize> > ());
+
+ vector<Line_division> best_5_configurations;
+ for (vsize i = 0; i < 5; i++)
+ best_5_configurations.push_back (current_configurations_[dems_and_indices[i].second]);
+
+ clear_line_details_cache ();
+ current_configurations_ = best_5_configurations;
+ }
+}
+
+void
+Page_breaking::set_to_ideal_line_configuration (vsize start, vsize end)
+{
+ current_chunks_ = chunk_list (start, end);
+ current_start_breakpoint_ = start;
+ current_end_breakpoint_ = end;
+ clear_line_details_cache ();
+
+ Line_division div;
+ for (vsize i = 0; i+1 < current_chunks_.size (); i++)
+ {
+ vsize sys = next_system (current_chunks_[i]);
+ if (all_[sys].pscore_)
+ {
+ line_breaker_args (sys, current_chunks_[i], current_chunks_[i+1], &start, &end);
+ div.push_back (line_breaking_[sys].best_solution (start, end).size ());
+ }
+ else
+ div.push_back (1);
+ }
+ current_configurations_.clear ();
+ current_configurations_.push_back (div);
}
vsize
Spacing_result
Page_breaking::space_systems_on_n_or_one_more_pages (vsize configuration, vsize n, vsize first_page_num)
{
- Spacing_result n_res = space_systems_on_n_pages (configuration, n, first_page_num);
- Spacing_result m_res = space_systems_on_n_pages (configuration, n+1, first_page_num);
+ Spacing_result n_res;
+ Spacing_result m_res;
+
+ if (n <= 2)
+ {
+ n_res = space_systems_on_n_pages (configuration, n, first_page_num);
+ m_res = space_systems_on_n_pages (configuration, n+1, first_page_num);
+ }
+ else
+ {
+ cache_line_details (configuration);
+ Page_spacer ps (cached_line_details_, first_page_num, this);
+ n_res = ps.solve (n);
+ m_res = ps.solve (n+1);
+ }
+
Real penalty = blank_page_penalty ();
n_res.demerits_ += penalty;
n_res.force_.back () += penalty;
projects / lilypond.git / commitdiff