Imported Upstream version 2.16.0

[lilypond.git] / lily / one-line-page-breaking.cc

diff --git a/lily/one-line-page-breaking.cc b/lily/one-line-page-breaking.cc
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+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2012 Joe Neeman <joeneeman@gmail.com>
+
+  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 <http://www.gnu.org/licenses/>.
+*/
+
+#include "one-line-page-breaking.hh"
+
+#include <limits>
+
+#include "column-x-positions.hh"
+#include "international.hh"
+#include "output-def.hh"
+#include "page-spacing.hh"
+#include "paper-book.hh"
+#include "paper-score.hh"
+#include "simple-spacer.hh"
+#include "system.hh"
+
+One_line_page_breaking::One_line_page_breaking (Paper_book *pb)
+  : Page_breaking (pb, 0, 0)
+{
+}
+
+One_line_page_breaking::~One_line_page_breaking ()
+{
+}
+
+/*
+  This is a somewhat unconventional page-breaking algorithm.  Every
+  score will be put on a single page, whose width is enough
+  to fit the entire score one one line.  Line breaks and page breaks
+  are ignored, and the paper-width setting in the paper block
+  will be modified to fit the music.
+*/
+SCM
+One_line_page_breaking::solve ()
+{
+  SCM all_pages = SCM_EOL;
+  Real max_width = 0;
+  for (vsize i = 0; i < system_specs_.size (); ++i)
+    {
+      if (Paper_score *ps = system_specs_[i].pscore_)
+        {
+          vector<Grob *> cols = ps->root_system ()->used_columns ();
+
+          // No indent, "infinite" line width, ragged.
+          Column_x_positions pos = get_line_configuration (cols, numeric_limits<Real>::max (), 0, true);
+          vector<Column_x_positions> positions;
+          positions.push_back (pos);
+
+          ps->root_system ()->break_into_pieces (positions);
+          ps->root_system ()->do_break_substitution_and_fixup_refpoints ();
+          Grob *system = ps->root_system ()->broken_intos_[0];
+
+          vector<vsize> lines_per_page;
+          lines_per_page.push_back (1);
+          SCM systems = scm_list_1 (system->self_scm ());
+          SCM pages = make_pages (lines_per_page, systems);
+
+          max_width = max (max_width, system->extent (system, X_AXIS).length ());
+          all_pages = scm_cons (scm_car (pages), all_pages);
+        }
+      else if (Prob *pb = system_specs_[i].prob_)
+        // Because we don't call Page_breaking::systems in this algorithm,
+        // we need to manually unprotect the titles.
+        pb->unprotect ();
+    }
+
+  // Alter paper-width so that it is large enough to fit every system.
+  // TODO: it might be nice to allow different pages to have different widths.
+  // This would need support in the backends (eg. framework-ps.scm).
+  Real right_margin = robust_scm2double (book_->paper_->c_variable ("right-margin"), 0.0);
+  Real left_margin = robust_scm2double (book_->paper_->c_variable ("left-margin"), 0.0);
+  Real width = max_width + right_margin + left_margin;
+  book_->paper_->set_variable (ly_symbol2scm ("paper-width"), scm_from_double (width));
+
+  return scm_reverse_x (all_pages, SCM_EOL);
+}