/*
  font-interface.cc --  implement Font_interface
  
  source file of the GNU LilyPond music typesetter

  (c) 2000--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/

#include "all-font-metrics.hh"
#include "font-metric.hh"
#include "font-interface.hh"
#include "grob.hh"
#include "output-def.hh"
#include "warn.hh"


/* todo: split up this func, reuse in text_item?  */
Font_metric *
Font_interface::get_default_font (Grob *me)
{
  Font_metric *fm = unsmob_metrics (me->get_property ("font"));
  if (!fm)
    {
      SCM chain = music_font_alist_chain (me);
      
      fm = select_font (me->get_layout (), chain);
      me->set_property ("font", fm->self_scm ());
    }
  
  return fm;
}

LY_DEFINE (ly_font_interface_get_default_font, "ly:get-default-font",
	  1 , 0, 0, (SCM grob),
	  "Return the default font for grob @var{gr}.")
{
  Grob *gr = unsmob_grob (grob);
  SCM_ASSERT_TYPE (gr, grob, SCM_ARG1, __FUNCTION__, "grob");

  return Font_interface::get_default_font (gr)->self_scm ();
}


SCM
Font_interface::music_font_alist_chain (Grob *g)
{
  SCM defaults
    = g->get_layout ()->lookup_variable (ly_symbol2scm ("font-defaults"));
  return g->get_property_alist_chain (defaults);
}

SCM
Font_interface::text_font_alist_chain (Grob *g)
{
  SCM defaults
    = g->get_layout ()->lookup_variable (ly_symbol2scm ("text-font-defaults"));
  return g->get_property_alist_chain (defaults);
}

ADD_INTERFACE (Font_interface, "font-interface",
	       "Any symbol that is typeset through fixed sets of glyphs, "
	       " (ie. fonts)",
	       "font-magnification font font-series font-shape "
	       "font-family font-encoding font-name font-size");
