X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Foptimal-page-breaking.cc;h=f495ab7fa6b6b23d84b21955dfd19598fad3e7ea;hb=5b4b0d6e9a197e8f9eb085b7c2ad78b8be3e5cfc;hp=d18ad2837e92ffe2104f0a4ae326bea06b0cc38e;hpb=474c8729dc274a30558102a015a01fa5882673db;p=lilypond.git diff --git a/lily/optimal-page-breaking.cc b/lily/optimal-page-breaking.cc index d18ad2837e..f495ab7fa6 100644 --- a/lily/optimal-page-breaking.cc +++ b/lily/optimal-page-breaking.cc @@ -5,9 +5,10 @@ source file of the GNU LilyPond music typesetter - (c) 2006--2007 Joe Neeman + (c) 2006--2008 Joe Neeman */ +#include "international.hh" #include "optimal-page-breaking.hh" #include "output-def.hh" #include "page-spacing.hh" @@ -32,90 +33,130 @@ Optimal_page_breaking::~Optimal_page_breaking () { } -Spacing_result -Optimal_page_breaking::try_page_spacing (Line_division const &line_count) +SCM +Optimal_page_breaking::solve () { - vector 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); - 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; - Real line_penalty = 0; - Real page_weighting = robust_scm2double (book_->paper_->c_variable ("page-spacing-weight"), 10); - - for (vsize i = 0; i < lines.size (); i++) + 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; + 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 { - line_force += lines[i].force_ * lines[i].force_; - line_penalty += lines[i].break_penalty_; + /* 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; } - ret.demerits_ = ret.force_[0] * ret.force_[0] * page_weighting; - for (vsize i = 1; i < ret.force_.size (); i++) - ret.demerits_ += ret.force_[i] * ret.force_[i] * page_weighting; - - /* for a while we tried averaging page and line forces instead of summing - them, but it caused the following problem. If there is a single page - with a very bad page force (for example because of a forced page break), - the page breaker will put in a _lot_ of pages so that the bad force - becomes averaged out over many pages. */ - ret.demerits_ += line_force + line_penalty; - return ret; -} + 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)); -SCM -Optimal_page_breaking::solve () -{ - 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++) + /* 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 this_best_demerits = infinity_f; - vector div = line_divisions (0, end, sys_count, lower_bound); - for (vsize d = 0; d < div.size (); d++) + Real best_demerits_for_this_sys_count = infinity_f; + set_current_breakpoints (0, end, sys_count, bound); + + for (vsize i = 0; i < current_configuration_count (); i++) { - Spacing_result cur = try_page_spacing (div[d]); - 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 = div[d]; + best_division = current_configuration (i); } - if (cur.demerits_ < this_best_demerits || isinf (best.demerits_)) + if (cur.demerits_ < best_demerits_for_this_sys_count || isinf (best_demerits_for_this_sys_count)) { - this_best_demerits = cur.demerits_; - lower_bound = div[d]; + best_demerits_for_this_sys_count = cur.demerits_; + bound = current_configuration (i); } - - vector 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; - - if (all_lines_stretched) - 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);