lily/afm.cc

   1 /*
   2   afm.cc --  implement Adobe_font_metric
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include <string.h>
  11
  12 #include "warn.hh"
  13 #include "libc-extension.hh"
  14 #include "afm.hh"
  15 #include "dimensions.hh"
  16
  17 Adobe_font_metric::Adobe_font_metric (AFM_Font_info *fi)
  18 {
  19   checksum_ = 0;
  20   font_info_ = fi;
  21   design_size_ = 1.0;
  22
  23   for (int i = 256 >? fi->numOfChars; i--;)
  24     ascii_to_metric_idx_.push (-1);
  25
  26   for (int i=0; i < fi->numOfChars; i++)
  27     {
  28       AFM_CharMetricInfo * c = fi->cmi + i;
  29
  30       /* Some TeX afm files contain code = -1.  We don't know why,
  31         let's ignore it.  */
  32       if (c->code >= 0)
  33         ascii_to_metric_idx_[c->code] = i;
  34       name_to_metric_dict_[c->name] = i;
  35     }
  36 }
  37
  38 Adobe_font_metric::~Adobe_font_metric ()
  39 {
  40   AFM_free (font_info_);
  41 }
  42
  43 SCM
  44 Adobe_font_metric::make_afm (AFM_Font_info *fi,
  45                              unsigned int checksum,
  46                              Real design_size)
  47 {
  48   Adobe_font_metric *fm = new Adobe_font_metric (fi);
  49   fm->checksum_ = checksum;
  50   fm->design_size_ = design_size;
  51   return fm->self_scm ();
  52 }
  53
  54 AFM_CharMetricInfo const*
  55 Adobe_font_metric::find_ascii_metric (int a) const
  56 {
  57   if (ascii_to_metric_idx_[a] >=0)
  58     {
  59       int code = ascii_to_metric_idx_[a];
  60       if (code >= 0)
  61         return font_info_->cmi + code;
  62     }
  63   return 0;
  64 }
  65
  66 AFM_CharMetricInfo const*
  67 Adobe_font_metric::find_char_metric (String nm) const
  68 {
  69   int idx = name_to_index (nm);
  70   if (idx >= 0)
  71     return font_info_->cmi + idx;
  72   return 0;
  73 }
  74
  75 int
  76 Adobe_font_metric::name_to_index (String name) const
  77 {
  78   std::map<String,int>::const_iterator ai = name_to_metric_dict_.find (name);
  79   if (ai == name_to_metric_dict_.end ())
  80     return -1;
  81   return (*ai).second;
  82 }
  83
  84 int
  85 Adobe_font_metric::count () const
  86 {
  87   return font_info_->numOfChars;
  88 }
  89
  90 Box
  91 Adobe_font_metric::get_ascii_char (int code) const
  92 {
  93   AFM_CharMetricInfo const *c = find_ascii_metric (code);
  94   Box b (Interval (0, 0), Interval (0, 0));
  95   if (c)
  96     b = afm_bbox_to_box (c->charBBox);
  97   return b;
  98 }
  99
 100 int
 101 Adobe_font_metric::index_to_ascii (int code) const
 102 {
 103   return font_info_->cmi[code].code;
 104 }
 105
 106 Box
 107 Adobe_font_metric::get_indexed_char (int code) const
 108 {
 109   if (code >= 0)
 110     return afm_bbox_to_box (font_info_->cmi[code].charBBox);
 111   else
 112     return Box (Interval (0, 0), Interval (0, 0));
 113 }
 114
 115 SCM
 116 read_afm_file (String nm)
 117 {
 118   FILE *f = fopen (nm.to_str0 () , "r");
 119   char s[2048] = "";
 120   char *check_key = "Comment TfmCheckSum";
 121   char *size_key = "Comment DesignSize";
 122
 123   unsigned int cs = 0;
 124   Real ds = 1.0;
 125
 126   /* Assume check_key in first 10 lines */
 127   for (int i = 0; i < 10; i++)
 128     {
 129       fgets (s, sizeof (s), f);
 130       if (strncmp (s, check_key, strlen (check_key)) == 0)
 131         sscanf (s + strlen (check_key), "%ud", &cs);
 132       else if (strncmp (s, size_key, strlen (size_key)) == 0)
 133         sscanf (s + strlen (size_key), "%lf", &ds);
 134     }
 135
 136   rewind (f);
 137
 138   AFM_Font_info *fi;
 139   int ok = AFM_parseFile (f, &fi, ~0);
 140
 141   if (ok)
 142     {
 143       error (_f ("Error parsing AFM file: `%s'", nm.to_str0 ()));
 144       exit (2);
 145     }
 146   fclose (f);
 147
 148   return Adobe_font_metric::make_afm (fi, cs, ds);
 149 }
 150
 151
 152 /* Actually, AFMs will be printers point, usually, but our .py script dumps
 153   real points.  */
 154 Box
 155 afm_bbox_to_box (AFM_BBox bb)
 156 {
 157   return Box (Interval (bb.llx, bb.urx)* (1/1000.0) PT,
 158               Interval (bb.lly, bb.ury)* (1/1000.0) PT);
 159
 160 }
 161
 162 Offset
 163 Adobe_font_metric::get_indexed_wxwy (int k) const
 164 {
 165   AFM_CharMetricInfo const *mi = font_info_->cmi+ k;
 166   return 1/1000.0 PT * Offset (mi->wx, mi->wy);
 167 }
 168
 169 Real
 170 Adobe_font_metric::design_size () const
 171 {
 172   return design_size_;
 173 }
 174
 175 String
 176 Adobe_font_metric::coding_scheme () const
 177 {
 178   return font_info_->gfi->encodingScheme;
 179 }