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 "tfm.hh"
  12
  13 #include "dimensions.hh"
  14 #include "file-name.hh"
  15 #include "international.hh"
  16 #include "string-convert.hh"
  17 #include "tfm-reader.hh"
  18 #include "warn.hh"
  19
  20 static Tex_font_char_metric dummy_static_char_metric;
  21
  22 Tex_font_char_metric::Tex_font_char_metric ()
  23 {
  24   exists_ = false;
  25   code_ = 0;;
  26   width_ = 0;
  27   height_ = 0;
  28   depth_ = 0;
  29   italic_correction_ = 0;
  30   width_fix_ = 0;
  31   height_fix_ = 0;
  32   depth_fix_ = 0;
  33   italic_correction_fix_ = 0;
  34 }
  35
  36 Box
  37 Tex_font_char_metric::dimensions () const
  38 {
  39   if (!exists_)
  40     {
  41       Box b;
  42       b.set_empty ();
  43       return b;
  44     }
  45
  46   Real d = -depth_;
  47   Real point_constant = 1 PT;
  48
  49   return Box (Interval (0, width_ * point_constant),
  50               Interval (min (d, height_) * point_constant,
  51                         max (d, height_) * point_constant));
  52 }
  53
  54 Tex_font_metric::Tex_font_metric ()
  55 {
  56   encoding_table_ = SCM_EOL;
  57 }
  58
  59 void
  60 Tex_font_metric::derived_mark () const
  61 {
  62   scm_gc_mark (encoding_table_);
  63 }
  64
  65 Tex_font_char_metric const *
  66 Tex_font_metric::find_ascii (vsize ascii, bool warn) const
  67 {
  68   if (ascii != VPOS && ascii < ascii_to_metric_idx_.size ()
  69       && ascii_to_metric_idx_[ascii] != VPOS)
  70     return &char_metrics_[ascii_to_metric_idx_ [ascii]];
  71   else if (warn)
  72     warning (_f ("can't find ascii character: %d", ascii));
  73   return &dummy_static_char_metric;
  74 }
  75
  76 /* UGH: glyphs need not be consecutive in TFM. */
  77 vsize
  78 Tex_font_metric::count () const
  79 {
  80   for (vsize i = ascii_to_metric_idx_.size (); i--;)
  81     if (ascii_to_metric_idx_[i] != VPOS)
  82       return i + 1;
  83   return 0;
  84 }
  85
  86 Box
  87 Tex_font_metric::get_ascii_char (vsize a) const
  88 {
  89   Box b = find_ascii (a)->dimensions ();
  90   return b;
  91 }
  92
  93 SCM
  94 Tex_font_metric::make_tfm (std::string file_name)
  95 {
  96   Tex_font_metric *tfm = new Tex_font_metric;
  97   Tex_font_metric_reader reader (file_name);
  98
  99   tfm->info_ = reader.info_;
 100   tfm->header_ = reader.header_;
 101   tfm->char_metrics_ = reader.char_metrics_;
 102   tfm->ascii_to_metric_idx_ = reader.ascii_to_metric_idx_;
 103
 104   File_name fn (file_name);
 105   tfm->font_name_ = fn.base_;
 106   return tfm->self_scm ();
 107 }
 108
 109 Tfm_info const &
 110 Tex_font_metric::info () const
 111 {
 112   return info_;
 113 }
 114
 115 Real
 116 Tex_font_metric::design_size () const
 117 {
 118   return info_.design_size * point_constant;
 119 }
 120
 121 std::string
 122 Tex_font_metric::font_name () const
 123 {
 124   return font_name_;
 125 }
 126
 127 vsize
 128 Tex_font_metric::name_to_index (std::string) const
 129 {
 130   assert (false);
 131   return 0;
 132 }