source file of the GNU LilyPond music typesetter
- (c) 2006--2007 Joe Neeman <joeneeman@gmail.com>
+ (c) 2006--2008 Joe Neeman <joeneeman@gmail.com>
*/
+#include "international.hh"
#include "optimal-page-breaking.hh"
#include "output-def.hh"
#include "page-spacing.hh"
SCM
Optimal_page_breaking::solve ()
{
- vsize end = breaks_.size () - 1;
- vsize min_sys_count = min_system_count (0, end);
+ vsize end = last_break_position ();
vsize max_sys_count = max_system_count (0, end);
- vsize max_page_count = INT_MAX;
- vsize cur_page_count = 0;
- Spacing_result best;
- Line_division best_division;
- Line_division lower_bound;
vsize first_page_num = robust_scm2int (book_->paper_->c_variable ("first-page-number"), 1);
+ SCM forced_page_count = book_->paper_->c_variable ("page-count");
- for (vsize sys_count = min_sys_count;
- cur_page_count <= max_page_count && sys_count <= max_sys_count;
- sys_count++)
+ set_to_ideal_line_configuration (0, end);
+
+ Page_spacing_result best;
+ vsize page_count = robust_scm2int (forced_page_count, 1);
+ Line_division ideal_line_division = current_configuration (0);
+ Line_division best_division = ideal_line_division;
+ vsize min_sys_count = 1;
+ vsize ideal_sys_count = system_count ();
+
+ if (!scm_is_integer (forced_page_count))
+ {
+ /* find out the ideal number of pages */
+ message (_ ("Finding the ideal number of pages..."));
+
+ best = space_systems_on_best_pages (0, first_page_num);
+ page_count = best.systems_per_page_.size ();
+
+ ideal_sys_count = best.system_count ();
+ min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
+
+ if (page_count > 1 && best.systems_per_page_[page_count - 2] > 1)
+ min_sys_count -= best.systems_per_page_[page_count - 2];
+
+ min_sys_count = max (min_sys_count, (vsize)1);
+ }
+ else
+ {
+ /* todo: the following line will spit out programming errors if the
+ ideal line spacing doesn't fit on PAGE_COUNT pages */
+ best = space_systems_on_n_pages (0, page_count, first_page_num);
+ min_sys_count = page_count;
+ }
+
+ if (page_count == 1)
+ message (_ ("Fitting music on 1 page..."));
+ else if (scm_is_integer (forced_page_count))
+ message (_f ("Fitting music on %d pages...", (int)page_count));
+ else
+ message (_f ("Fitting music on %d or %d pages...", (int)page_count-1, (int)page_count));
+
+ /* try a smaller number of systems than the ideal number for line breaking */
+ Line_division bound = ideal_line_division;
+ for (vsize sys_count = ideal_sys_count; --sys_count >= min_sys_count;)
+ {
+ Page_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);
+ Page_spacing_result cur;
+
+ if (min_p_count == page_count || scm_is_integer (forced_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 the pages are stretched on average, stop trying to reduce sys_count */
+ if (best_for_this_sys_count.page_count () < page_count
+ && best_for_this_sys_count.average_force () > 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);
+ Page_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);
projects / lilypond.git / blobdiff