/*
- optimal-page-breaking.cc -- implement a page-breaker that
- will break pages in such a way that both horizontal and
- vertical spacing will be acceptable
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2006--2011 Joe Neeman <joeneeman@gmail.com>
- (c) 2006--2009 Joe Neeman <joeneeman@gmail.com>
+ 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.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "international.hh"
#include "prob.hh"
#include "system.hh"
-static bool
-is_break (Grob *)
-{
- return false;
-}
-
Optimal_page_breaking::Optimal_page_breaking (Paper_book *pb)
- : Page_breaking (pb, is_break)
+ : Page_breaking (pb, 0, 0)
{
}
{
}
+extern bool debug_page_breaking_scoring;
+
SCM
Optimal_page_breaking::solve ()
{
vsize end = last_break_position ();
vsize max_sys_count = max_system_count (0, end);
vsize first_page_num = robust_scm2int (book_->paper_->c_variable ("first-page-number"), 1);
- SCM forced_page_count = book_->paper_->c_variable ("page-count");
set_to_ideal_line_configuration (0, end);
Page_spacing_result best;
+ SCM forced_page_count = book_->paper_->c_variable ("page-count");
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;
+
+ // Note that system_count () only counts non-title systems.
vsize ideal_sys_count = system_count ();
if (!scm_is_integer (forced_page_count))
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 ();
+ page_count = best.systems_per_page_.size ();
min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
if (page_count > 1 && best.systems_per_page_[page_count - 2] > 1)
}
else
{
- /* todo: the following line will spit out programming errors if the
+ /* If systems-per-page and page-count are both specified, we know exactly
+ how many systems should be present. */
+ if (systems_per_page () > 0)
+ {
+ ideal_sys_count = systems_per_page () * page_count;
+
+ if (ideal_sys_count > max_system_count (0, end)
+ || ideal_sys_count < min_system_count (0, end))
+ {
+ warning (_ ("could not satisfy systems-per-page and page-count at the same time, ignoring systems-per-page"));
+ ideal_sys_count = system_count ();
+ min_sys_count = page_count;
+ }
+ else
+ {
+ set_current_breakpoints (0, end, ideal_sys_count);
+ min_sys_count = max_sys_count = ideal_sys_count;
+ ideal_line_division = best_division = current_configuration (0);
+ }
+ }
+ else
+ min_sys_count = page_count;
+
+ /* 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)
/* 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;)
+ for (vsize sys_count = ideal_sys_count + 1; --sys_count >= min_sys_count;)
{
Page_spacing_result best_for_this_sys_count;
set_current_breakpoints (0, end, sys_count, Line_division (), bound);
+ if (debug_page_breaking_scoring)
+ message (_f ("trying %d systems", (int)sys_count));
+
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))
+ if (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);
+ cur = space_systems_on_best_pages (i, first_page_num);
- if (cur.demerits_ < best_for_this_sys_count.demerits_ || isinf (best_for_this_sys_count.demerits_))
+ if (cur.demerits_ < 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_))
+ if (debug_page_breaking_scoring)
+ message (_f ("best score for this sys-count: %f", best_for_this_sys_count.demerits_));
+
+ if (best_for_this_sys_count.demerits_ < 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;
-
+ /* Check to see if we already have too few systems. There are two ways
+ we check this: if we are trying one less than the ideal number of pages
+ and the pages are stretched on average then we have too
+ few systems. If the spacing is worse than BAD_SPACING_PENALTY, then we
+ have too few systems. In either case, though, we need to continue reducing
+ the number of systems if max-systems-per-page requires it. */
+ if (!(best.system_count_status_ & SYSTEM_COUNT_TOO_MANY))
+ {
+ 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;
+ if (best_for_this_sys_count.demerits_ >= BAD_SPACING_PENALTY)
+ break;
+ }
}
/* try a larger number of systems than the ideal line breaking number. This
Real best_demerits_for_this_sys_count = infinity_f;
set_current_breakpoints (0, end, sys_count, bound);
+ if (debug_page_breaking_scoring)
+ message (_f ("trying %d systems", (int)sys_count));
+
for (vsize i = 0; i < current_configuration_count (); i++)
{
vsize min_p_count = min_page_count (i, first_page_num);
if (min_p_count > page_count)
continue;
- else
+ else if (scm_is_integer (forced_page_count))
cur = space_systems_on_n_pages (i, page_count, first_page_num);
+ else
+ cur = space_systems_on_best_pages (i, first_page_num);
- if (cur.demerits_ < best.demerits_ || isinf (best.demerits_))
+ if (cur.demerits_ < best.demerits_)
{
best = cur;
best_division = current_configuration (i);
}
- if (cur.demerits_ < best_demerits_for_this_sys_count || isinf (best_demerits_for_this_sys_count))
+ if (cur.demerits_ < best_demerits_for_this_sys_count)
{
best_demerits_for_this_sys_count = cur.demerits_;
bound = current_configuration (i);
}
}
- if (isinf (best_demerits_for_this_sys_count))
+
+ if (debug_page_breaking_scoring)
+ message (_f ("best score for this sys-count: %f", best_demerits_for_this_sys_count));
+
+ if (best_demerits_for_this_sys_count >= BAD_SPACING_PENALTY
+ && !(best.system_count_status_ & SYSTEM_COUNT_TOO_FEW))
break;
}
projects / lilypond.git / blobdiff