#include "system.hh"
static bool
-is_break (Grob *)
+is_break (Grob *g)
{
- return false;
+ return g->get_property ("page-break-permission") == ly_symbol2scm ("force");
}
Optimal_page_breaking::Optimal_page_breaking (Paper_book *pb)
{
}
-SCM
-Optimal_page_breaking::solve ()
+// Solves the subproblem betwen the (END-1)th \pageBreak and the
+// ENDth \pageBreak.
+// Returns a vector of systems per page for the pages within this chunk.
+vector<vsize>
+Optimal_page_breaking::solve_chunk (vsize end)
{
- vsize end = last_break_position ();
- vsize max_sys_count = max_system_count (0, end);
+ vsize max_sys_count = max_system_count (end-1, 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);
+ set_to_ideal_line_configuration (end-1, end);
Page_spacing_result best;
vsize page_count = robust_scm2int (forced_page_count, 1);
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 ();
+ if (systems_per_page () > 0)
+ best = space_systems_with_fixed_number_per_page (0, first_page_num);
+ else
+ 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 ();
}
else
{
- /* todo: the following line will spit out programming errors if the
+ /* TODO: the following line will spit out programming errors if the
ideal line spacing doesn't fit on PAGE_COUNT pages */
+ /* TODO: the interaction between systems_per_page and page_count needs to
+ be considered. */
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));
+ if (page_count == 1 || scm_is_integer (forced_page_count))
+ progress_indication (_f ("[%d: %d pages]", (int) end, (int) page_count));
else
- message (_f ("Fitting music on %d or %d pages...", (int)page_count-1, (int)page_count));
+ progress_indication (_f ("[%d: %d or %d pages]", (int) end, (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);
+ set_current_breakpoints (end-1, end, sys_count, Line_division (), bound);
for (vsize i = 0; i < current_configuration_count (); i++)
{
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_))
+ 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 (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
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, bound);
+ set_current_breakpoints (end-1, end, sys_count, bound);
for (vsize i = 0; i < current_configuration_count (); i++)
{
else
cur = space_systems_on_n_pages (i, page_count, 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 (best_demerits_for_this_sys_count >= BAD_SPACING_PENALTY
+ && !(best.system_count_status_ & SYSTEM_COUNT_TOO_FEW))
break;
}
+ break_into_pieces (end-1, end, best_division);
+
+ return best.systems_per_page_;
+}
+
+SCM
+Optimal_page_breaking::solve ()
+{
+ vector<vsize> systems_per_page;
+
+ message (_f ("Solving %d page-breaking chunks...", last_break_position ()));
+ for (vsize end = 1; end <= last_break_position (); ++end)
+ {
+ vector<vsize> chunk_systems = solve_chunk (end);
+ systems_per_page.insert (systems_per_page.end (), chunk_systems.begin (), chunk_systems.end ());
+ }
message (_ ("Drawing systems..."));
- break_into_pieces (0, end, best_division);
SCM lines = systems ();
- return make_pages (best.systems_per_page_, lines);
+ return make_pages (systems_per_page, lines);
}
projects / lilypond.git / blobdiff