X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fpaper-def.cc;h=4c6dc86ebeb8d645477920e9e4aa35c4b45cdd5a;hb=a1936b89236c17f1fa2abcb8f2f747d586073129;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hpb=664070d837cc4855091455892cb942cdcedeef0c;p=lilypond.git

diff --git a/lily/paper-def.cc b/lily/paper-def.cc
index e69de29bb2..4c6dc86ebe 100644
--- a/lily/paper-def.cc
+++ b/lily/paper-def.cc
@@ -0,0 +1,124 @@
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2004--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+  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 "dimensions.hh"
+#include "libc-extension.hh"
+#include "output-def.hh"
+#include "modified-font-metric.hh"
+#include "pango-font.hh"
+#include "all-font-metrics.hh"
+
+Real
+output_scale (Output_def *od)
+{
+  return scm_to_double (od->lookup_variable (ly_symbol2scm ("output-scale")));
+}
+
+SCM
+get_font_table (Output_def *def)
+{
+  SCM font_table = def->lookup_variable (ly_symbol2scm ("scaled-fonts"));
+  if (scm_hash_table_p (font_table) != SCM_BOOL_T)
+    {
+      font_table = scm_c_make_hash_table (11);
+      def->set_variable (ly_symbol2scm ("scaled-fonts"), font_table);
+    }
+  return font_table;
+}
+
+SCM
+get_pango_font_table (Output_def *def)
+{
+  SCM font_table = def->lookup_variable (ly_symbol2scm ("pango-fonts"));
+  if (scm_hash_table_p (font_table) != SCM_BOOL_T)
+    {
+      font_table = scm_c_make_hash_table (11);
+      def->set_variable (ly_symbol2scm ("pango-fonts"), font_table);
+    }
+  return font_table;
+}
+
+/* TODO: should add nesting for Output_def here too. */
+Font_metric *
+find_scaled_font (Output_def *mod, Font_metric *f, Real m)
+{
+  if (mod->parent_)
+    return find_scaled_font (mod->parent_, f, m);
+
+  Real lookup_mag = m / output_scale (mod);
+
+  SCM font_table = get_font_table (mod);
+  SCM sizes = scm_hashq_ref (font_table, f->self_scm (), SCM_EOL);
+  SCM handle = scm_assoc (scm_from_double (lookup_mag), sizes);
+  if (scm_is_pair (handle))
+    return unsmob_metrics (scm_cdr (handle));
+
+  SCM val = Modified_font_metric::make_scaled_font_metric (f, lookup_mag);
+
+  sizes = scm_acons (scm_from_double (lookup_mag), val, sizes);
+  unsmob_metrics (val)->unprotect ();
+  scm_hashq_set_x (font_table, f->self_scm (), sizes);
+  return unsmob_metrics (val);
+}
+
+Font_metric *
+find_pango_font (Output_def *layout, SCM descr, Real factor)
+{
+  if (layout->parent_)
+    return find_pango_font (layout->parent_, descr, factor);
+
+  SCM table = get_pango_font_table (layout);
+  SCM sizes = scm_hash_ref (table, descr, SCM_EOL);
+  SCM size_key = scm_from_double (factor);
+  SCM handle = scm_assoc (size_key, sizes);
+  if (scm_is_pair (handle))
+    return unsmob_metrics (scm_cdr (handle));
+
+  PangoFontDescription *description
+    = pango_font_description_from_string (scm_i_string_chars (descr));
+
+  pango_font_description_set_size
+    (description,
+     gint (my_round (factor * pango_font_description_get_size (description))));
+
+  Font_metric *fm = all_fonts_global->find_pango_font (description,
+                                                       output_scale (layout));
+
+  pango_font_description_free (description);
+
+  sizes = scm_acons (size_key, fm->self_scm (), sizes);
+  scm_hash_set_x (table, descr, sizes);
+
+  return fm;
+}
+
+/* TODO: this is a nasty interface. During formatting,
+   the Output_def should be scaled to the output_scale_
+   specified in the toplevel Output_def.  */
+Output_def *
+scale_output_def (Output_def *o, Real amount)
+{
+  SCM proc = ly_lily_module_constant ("scale-layout");
+  SCM new_pap = scm_call_2 (proc, o->self_scm (), scm_from_double (amount));
+
+  o = unsmob_output_def (new_pap);
+  o->protect ();
+  return o;
+}
+