X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Foptimal-page-breaking.cc;h=31771e70e244a9e563b22f082bd02a99a3d3713b;hb=436440663fe93a8bb94776a3363376ee5c7c57af;hp=34ff7f1b184cb519b418c2b44f53417599a31b4d;hpb=02dfebc14562bc49b61bbf525c0a845d247a885f;p=lilypond.git diff --git a/lily/optimal-page-breaking.cc b/lily/optimal-page-breaking.cc index 34ff7f1b18..31771e70e2 100644 --- a/lily/optimal-page-breaking.cc +++ b/lily/optimal-page-breaking.cc @@ -1,11 +1,20 @@ /* - 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--2010 Joe Neeman - (c) 2006--2007 Joe Neeman + 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 . */ #include "international.hh" @@ -20,8 +29,7 @@ static bool is_break (Grob *g) { - (void) g; /* shutup warning */ - return false; + return g->get_property ("page-break-permission") == ly_symbol2scm ("force"); } Optimal_page_breaking::Optimal_page_breaking (Paper_book *pb) @@ -33,73 +41,108 @@ Optimal_page_breaking::~Optimal_page_breaking () { } -SCM -Optimal_page_breaking::solve () +extern bool debug_page_breaking_scoring; + +// 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 +Optimal_page_breaking::solve_chunk (vsize end, SCM forced_page_count) { - 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); - /* find out the ideal number of pages */ - message (_ ("Finding the ideal number of pages...")); - set_to_ideal_line_configuration (0, end); - - Page_spacing_result best = space_systems_on_best_pages (0, first_page_num); - vsize page_count = best.systems_per_page_.size (); + set_to_ideal_line_configuration (end-1, 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 ideal_sys_count = best.system_count (); - vsize min_sys_count = ideal_sys_count - best.systems_per_page_.back (); + vsize min_sys_count = 1; + vsize ideal_sys_count = system_count (); - if (page_count > 1 && best.systems_per_page_[page_count - 2] > 1) - min_sys_count -= best.systems_per_page_[page_count - 2]; + if (!scm_is_integer (forced_page_count)) + { + 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 (); + + 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 */ + /* 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...")); + 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); + + 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) - continue; - else if (min_p_count == page_count) + 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); + cur = space_systems_on_n_or_one_more_pages (i, page_count-1, first_page_num, 0); - 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 @@ -109,7 +152,10 @@ Optimal_page_breaking::solve () 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); + + if (debug_page_breaking_scoring) + message (_f ("trying %d systems", (int)sys_count)); for (vsize i = 0; i < current_configuration_count (); i++) { @@ -121,25 +167,71 @@ Optimal_page_breaking::solve () 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 (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; } + break_into_pieces (end-1, end, best_division); + + return best.systems_per_page_; +} + +SCM +Optimal_page_breaking::solve () +{ + vector systems_per_page; + + SCM forced_page_counts = book_->paper_->c_variable ("page-count"); + if (scm_is_integer (forced_page_counts)) + forced_page_counts = scm_list_1 (forced_page_counts); + + bool is_forced_page_counts = false; + if (scm_to_bool (scm_list_p (forced_page_counts))) + { + int len = scm_to_int (scm_length (forced_page_counts)); + if (len != (int)last_break_position ()) + { + warning (_f ("page-count has length %d, but it should have length %d " + "(one more than the number of forced page breaks)", + len, (int)last_break_position ())); + } + else + is_forced_page_counts = true; + } + + + message (_f ("Solving %d page-breaking chunks...", last_break_position ())); + for (vsize end = 1; end <= last_break_position (); ++end) + { + SCM page_count = SCM_EOL; + if (is_forced_page_counts) + { + page_count = scm_car (forced_page_counts); + forced_page_counts = scm_cdr (forced_page_counts); + } + + vector chunk_systems = solve_chunk (end, page_count); + systems_per_page.insert (systems_per_page.end (), chunk_systems.begin (), chunk_systems.end ()); + } - message ("Drawing systems..."); - break_into_pieces (0, end, best_division); + message (_ ("Drawing systems...")); SCM lines = systems (); - return make_pages (best.systems_per_page_, lines); + return make_pages (systems_per_page, lines); }