lily/tfm.cc

   1 /*
   2   tfm.cc -- implement Tex_font_metric
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2006 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   some code shamelessly copied from GNU fontutils-0.6/tfm/tfm_input.c
   9 */
  10
  11 #include "file-name.hh"
  12 #include "tfm.hh"
  13 #include "tfm-reader.hh"
  14 #include "string-convert.hh"
  15 #include "warn.hh"
  16 #include "dimensions.hh"
  17
  18 static Tex_font_char_metric dummy_static_char_metric;
  19
  20 Tex_font_char_metric::Tex_font_char_metric ()
  21 {
  22   exists_ = false;
  23   code_ = 0;;
  24   width_ = 0;
  25   height_ = 0;
  26   depth_ = 0;
  27   italic_correction_ = 0;
  28   width_fix_ = 0;
  29   height_fix_ = 0;
  30   depth_fix_ = 0;
  31   italic_correction_fix_ = 0;
  32 }
  33
  34 Box
  35 Tex_font_char_metric::dimensions () const
  36 {
  37   if (!exists_)
  38     {
  39       Box b;
  40       b.set_empty ();
  41       return b;
  42     }
  43
  44   Real d = -depth_;
  45   Real point_constant = 1 PT;
  46
  47   return Box (Interval (0, width_ * point_constant),
  48               Interval (min (d, height_) * point_constant,
  49                         max (d, height_) * point_constant));
  50 }
  51
  52 Tex_font_metric::Tex_font_metric ()
  53 {
  54   encoding_table_ = SCM_EOL;
  55 }
  56
  57 void
  58 Tex_font_metric::derived_mark () const
  59 {
  60   scm_gc_mark (encoding_table_);
  61 }
  62
  63 Tex_font_char_metric const *
  64 Tex_font_metric::find_ascii (int ascii, bool warn) const
  65 {
  66   if (ascii >= 0 && ascii < ascii_to_metric_idx_.size ()
  67       && ascii_to_metric_idx_[ascii] >= 0)
  68     return &char_metrics_[ascii_to_metric_idx_ [ascii]];
  69   else if (warn)
  70     warning (_f ("can't find ascii character: %d", ascii));
  71   return &dummy_static_char_metric;
  72 }
  73
  74 /* UGH: glyphs need not be consecutive in TFM. */
  75 int
  76 Tex_font_metric::count () const
  77 {
  78   for (int i = ascii_to_metric_idx_.size (); i--;)
  79     if (ascii_to_metric_idx_[i] != -1)
  80       return i + 1;
  81   return 0;
  82 }
  83
  84 Box
  85 Tex_font_metric::get_ascii_char (int a) const
  86 {
  87   Box b = find_ascii (a)->dimensions ();
  88   return b;
  89 }
  90
  91 SCM
  92 Tex_font_metric::make_tfm (String file_name)
  93 {
  94   Tex_font_metric *tfm = new Tex_font_metric;
  95   Tex_font_metric_reader reader (file_name);
  96
  97   tfm->info_ = reader.info_;
  98   tfm->header_ = reader.header_;
  99   tfm->char_metrics_ = reader.char_metrics_;
 100   tfm->ascii_to_metric_idx_ = reader.ascii_to_metric_idx_;
 101
 102   File_name fn (file_name);
 103   tfm->font_name_ = fn.base_;
 104   return tfm->self_scm ();
 105 }
 106
 107 Tfm_info const &
 108 Tex_font_metric::info () const
 109 {
 110   return info_;
 111 }
 112
 113 Real
 114 Tex_font_metric::design_size () const
 115 {
 116   return info_.design_size * point_constant;
 117 }
 118
 119 String
 120 Tex_font_metric::font_name () const
 121 {
 122   return font_name_;
 123 }
 124
 125 int
 126 Tex_font_metric::name_to_index (String) const
 127 {
 128   assert (false);
 129   return 0;
 130 }