/*
- optimal-page-breaking.hh -- implement a page-breaker that
+ 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
#include "prob.hh"
#include "system.hh"
+static bool
+is_break (Grob *g)
+{
+ (void) g; /* shutup warning */
+ return false;
+}
+
Optimal_page_breaking::Optimal_page_breaking (Paper_book *pb)
- : Page_breaking (pb, false)
+ : Page_breaking (pb, is_break)
{
}
}
Spacing_result
-Optimal_page_breaking::try_page_spacing (vector<vsize> line_count)
+Optimal_page_breaking::try_page_spacing (Line_division const &line_count)
{
- vector<Line_details> lines = get_line_details (0, breaks_.size () - 1, line_count);
+ vector<Line_details> lines = line_details (0, breaks_.size () - 1, line_count);
Real page_h = page_height (1, false); // FIXME
SCM force_sym = ly_symbol2scm ("blank-last-page-force");
Real blank_force = robust_scm2double (book_->paper_->lookup_variable (force_sym), 0);
- Spacing_result ret = space_systems_on_best_pages (lines, page_h, blank_force);
-
bool ragged_all = to_boolean (book_->paper_->c_variable ("ragged-bottom"));
bool ragged_last = to_boolean (book_->paper_->c_variable ("ragged-last-bottom"));
+ Spacing_result ret = space_systems_on_best_pages (lines,
+ page_h,
+ blank_force,
+ ragged_all,
+ ragged_last);
/* add in the line penalties */
Real line_force = 0;
line_penalty += lines[i].break_penalty_;
}
- if (ragged_all)
- for (vsize i = 0; i < ret.force_.size () - 1; i++)
- ret.force_[i] = min (0.0, ret.force_[i]);
- if (ragged_all || ragged_last)
- ret.force_.back () = min (0.0, ret.force_.back ());
-
ret.demerits_ = ret.force_[0] * ret.force_[0] * page_weighting;
for (vsize i = 1; i < ret.force_.size (); i++)
{
return ret;
}
-/* The algorithm is as follows:
- 1) break everything into its preferred number of lines
- 2) decrease the number of lines until we've decreased
- the number of pages
- 3) increase the number of lines until we've increased
- the number of pages
- Take the best score we've found
-*/
SCM
Optimal_page_breaking::solve ()
{
- vector<vsize> ideal_line_count;
- vector<vsize> max_line_count;
- vector<vsize> min_line_count;
- vector<vsize> last_best_line_count;
- vector<vsize> best_line_count;
- vsize last_line_total = 0;
-
- calc_system_count_bounds (0, breaks_.size () - 1, &min_line_count, &max_line_count);
- ideal_line_count.resize (all_.size (), 1);
- for (vsize i = 0; i < all_.size (); i++)
+ vsize end = breaks_.size () - 1;
+ vsize min_sys_count = min_system_count (0, end);
+ 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;
+
+ for (vsize sys_count = min_sys_count;
+ cur_page_count <= max_page_count && sys_count <= max_sys_count;
+ sys_count++)
{
- if (all_[i].pscore_)
- ideal_line_count[i] = line_breaking_[i].get_best_solution (0, VPOS).size ();
- last_line_total += ideal_line_count[i];
- }
-
- Spacing_result best_result = try_page_spacing (ideal_line_count);
- vsize original_page_count = best_result.systems_per_page_.size ();
- best_line_count = ideal_line_count;
- last_best_line_count = ideal_line_count;
-
- Direction d = original_page_count > 1 ? DOWN : UP;
- vector<vector<vsize> > div;
- Spacing_result this_best_result;
- do {
- do {
- vector<vsize> blank;
-
- vector<vsize> this_best_line_count;
- this_best_result.demerits_ = infinity_f;
-
- last_line_total += d;
- div.clear ();
- divide_systems (last_line_total,
- d == DOWN ? min_line_count : last_best_line_count,
- d == DOWN ? last_best_line_count : max_line_count,
- &div, &blank);
-
- for (vsize i = 0; i < div.size (); i++)
+ Real this_best_demerits = infinity_f;
+ vector<Line_division> div = line_divisions (0, end, sys_count, lower_bound);
+ for (vsize d = 0; d < div.size (); d++)
{
- Spacing_result cur = try_page_spacing (div[i]);
- if (cur.demerits_ < this_best_result.demerits_)
+ Spacing_result cur = try_page_spacing (div[d]);
+ cur_page_count = cur.systems_per_page_.size ();
+ if (cur.demerits_ < best.demerits_ || isinf (best.demerits_))
{
- this_best_result = cur;
- this_best_line_count = div[i];
+ best = cur;
+ best_division = div[d];
}
- }
- last_best_line_count = this_best_line_count;
-
- if (this_best_result.demerits_ < best_result.demerits_)
- {
- best_line_count = this_best_line_count;
- best_result = this_best_result;
- }
- } while (div.size () && this_best_result.systems_per_page_.size () == original_page_count);
-
- /* we're finished decreasing system count, let's try raising it */
- last_best_line_count = ideal_line_count;
- last_line_total = 0;
- for (vsize i = 0; i < ideal_line_count.size (); i++)
- last_line_total += ideal_line_count[i];
-
- } while (flip (&d) != DOWN);
- SCM lines = make_lines (best_line_count);
- SCM pages = make_pages (best_result.systems_per_page_, lines);
- return pages;
-}
+ if (cur.demerits_ < this_best_demerits || isinf (best.demerits_))
+ {
+ this_best_demerits = cur.demerits_;
+ lower_bound = div[d];
+ }
-SCM
-Optimal_page_breaking::make_lines (vector<vsize> line_count)
-{
- assert (line_count.size () == all_.size ());
+ vector<Line_details> det = line_details (0, end, div[d]);
+ bool all_lines_stretched = true;
+ for (vsize i = 0; i < det.size (); i++)
+ if (det[i].force_ < 0)
+ all_lines_stretched = false;
- SCM ret = SCM_EOL;
- for (vsize i = 0; i < all_.size (); i++)
- {
- if (all_[i].pscore_)
- {
- vector<Column_x_positions> line_brk = line_breaking_[i].get_solution (0, VPOS, line_count[i]);
- System *sys = all_[i].pscore_->root_system ();
-
- sys->break_into_pieces (line_brk);
- ret = scm_append (scm_list_2 (ret, scm_vector_to_list (sys->get_paper_systems ())));
- }
- else
- {
- SCM l = scm_cons (all_[i].prob_->self_scm (), SCM_EOL);
- ret = scm_append (scm_list_2 (ret, l));
- all_[i].prob_->unprotect ();
+ if (all_lines_stretched)
+ max_page_count = min (max_page_count, cur_page_count + 1);
}
}
- return ret;
+
+ break_into_pieces (0, end, best_division);
+ SCM lines = systems ();
+ return make_pages (best.systems_per_page_, lines);
}
+
projects / lilypond.git / blobdiff