lily/minimal-page-breaking.cc

   1 /*
   2   minimal-page-breaking.cc -- implement a page-breaker that stacks as
   3   many systems on a page before moving to the next one. Specialized
   4   for books with many pages, or a lot of text.
   5
   6   source file of the GNU LilyPond music typesetter
   7
   8   (c) 2007--2009 Nicolas Sceaux <nicolas.sceaux@free.fr>
   9 */
  10
  11 #include "international.hh"
  12 #include "minimal-page-breaking.hh"
  13 #include "output-def.hh"
  14 #include "page-spacing.hh"
  15 #include "paper-book.hh"
  16
  17 static bool
  18 is_break (Grob *)
  19 {
  20   return false;
  21 }
  22
  23 Minimal_page_breaking::Minimal_page_breaking (Paper_book *pb)
  24   : Page_breaking (pb, is_break)
  25 {
  26 }
  27
  28 Minimal_page_breaking::~Minimal_page_breaking ()
  29 {
  30 }
  31
  32 SCM
  33 Minimal_page_breaking::solve ()
  34 {
  35   vsize end = last_break_position ();
  36
  37   message (_ ("Calculating line breaks..."));
  38   set_to_ideal_line_configuration (0, end);
  39   break_into_pieces (0, end, current_configuration (0));
  40
  41   message (_ ("Calculating page breaks..."));
  42   vsize first_page_num = robust_scm2int (book_->paper_->c_variable ("first-page-number"), 1);
  43   Page_spacing_result res = pack_systems_on_least_pages (0, first_page_num);
  44   SCM lines = systems ();
  45   return make_pages (res.systems_per_page_, lines);
  46 }