/*
  tfm.cc -- implement Tex_font_metric

  source file of the GNU LilyPond music typesetter

  (c) 1999--2006 Jan Nieuwenhuizen <janneke@gnu.org>

  some code shamelessly copied from GNU fontutils-0.6/tfm/tfm_input.c
*/

#include "tfm.hh"

#include "dimensions.hh"
#include "file-name.hh"
#include "international.hh"
#include "string-convert.hh"
#include "tfm-reader.hh"
#include "warn.hh"

static Tex_font_char_metric dummy_static_char_metric;

Tex_font_char_metric::Tex_font_char_metric ()
{
  exists_ = false;
  code_ = 0;;
  width_ = 0;
  height_ = 0;
  depth_ = 0;
  italic_correction_ = 0;
  width_fix_ = 0;
  height_fix_ = 0;
  depth_fix_ = 0;
  italic_correction_fix_ = 0;
}

Box
Tex_font_char_metric::dimensions () const
{
  if (!exists_)
    {
      Box b;
      b.set_empty ();
      return b;
    }

  Real d = -depth_;
  Real point_constant = 1 PT;

  return Box (Interval (0, width_ * point_constant),
	      Interval (min (d, height_) * point_constant,
			max (d, height_) * point_constant));
}

Tex_font_metric::Tex_font_metric ()
{
  encoding_table_ = SCM_EOL;
}

void
Tex_font_metric::derived_mark () const
{
  scm_gc_mark (encoding_table_);
}

Tex_font_char_metric const *
Tex_font_metric::find_ascii (vsize ascii, bool warn) const
{
  if (ascii != VPOS && ascii < ascii_to_metric_idx_.size ()
      && ascii_to_metric_idx_[ascii] != VPOS)
    return &char_metrics_[ascii_to_metric_idx_ [ascii]];
  else if (warn)
    warning (_f ("can't find ascii character: %d", ascii));
  return &dummy_static_char_metric;
}

/* UGH: glyphs need not be consecutive in TFM. */
vsize
Tex_font_metric::count () const
{
  for (vsize i = ascii_to_metric_idx_.size (); i--;)
    if (ascii_to_metric_idx_[i] != VPOS)
      return i + 1;
  return 0;
}

Box
Tex_font_metric::get_ascii_char (vsize a) const
{
  Box b = find_ascii (a)->dimensions ();
  return b;
}

SCM
Tex_font_metric::make_tfm (string file_name)
{
  Tex_font_metric *tfm = new Tex_font_metric;
  Tex_font_metric_reader reader (file_name);

  tfm->info_ = reader.info_;
  tfm->header_ = reader.header_;
  tfm->char_metrics_ = reader.char_metrics_;
  tfm->ascii_to_metric_idx_ = reader.ascii_to_metric_idx_;

  File_name fn (file_name);
  tfm->font_name_ = fn.base_;
  return tfm->self_scm ();
}

Tfm_info const &
Tex_font_metric::info () const
{
  return info_;
}

Real
Tex_font_metric::design_size () const
{
  return info_.design_size * point_constant;
}

string
Tex_font_metric::font_name () const
{
  return font_name_;
}

vsize
Tex_font_metric::name_to_index (string) const
{
  assert (false);
  return 0;
}
