X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Foptimal-page-breaking.cc;h=e9010aec09345ef715d247a20a0a854d34bc5956;hb=fb2da83dbad533dae077e96d314b69a103df6ab3;hp=3c26c9abe08c5d15ac932cd4f2ed7f025f6a19f2;hpb=024e51d1cb0e21d211baf91ad0774bc766dff687;p=lilypond.git diff --git a/lily/optimal-page-breaking.cc b/lily/optimal-page-breaking.cc index 3c26c9abe0..e9010aec09 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" @@ -17,15 +26,8 @@ #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, is_break) + : Page_breaking (pb, 0, 0) { } @@ -33,17 +35,19 @@ Optimal_page_breaking::~Optimal_page_breaking () { } +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; @@ -55,19 +59,26 @@ Optimal_page_breaking::solve () /* 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 (); 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 + /* 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; } @@ -86,37 +97,49 @@ Optimal_page_breaking::solve () 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 @@ -128,6 +151,9 @@ Optimal_page_breaking::solve () 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); @@ -135,22 +161,29 @@ Optimal_page_breaking::solve () 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; }