lily/font-metric.cc

   1 /*
   2   font-metric.cc -- implement Font_metric
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8     Mats Bengtsson <matsb@s3.kth.se> (the ugly TeX parsing in text_dimension)
   9  */
  10
  11 #include <math.h>
  12 #include <ctype.h>
  13
  14 #include "scaled-font-metric.hh"
  15 #include "virtual-methods.hh"
  16 #include "warn.hh"
  17 #include "stencil.hh"
  18 #include "ly-smobs.icc"
  19 #include "font-metric.hh"
  20 #include "string.hh"
  21
  22 Real
  23 Font_metric::design_size () const
  24 {
  25   return 1.0;
  26 }
  27
  28 String
  29 Font_metric::coding_scheme () const
  30 {
  31   return "FontSpecific";
  32 }
  33
  34 Stencil
  35 Font_metric::find_by_name (String s) const
  36 {
  37   int idx = name_to_index (s);
  38   Box b;
  39
  40   SCM expr = SCM_EOL;
  41   if (idx >= 0)
  42     {
  43       expr = scm_list_3 (ly_symbol2scm ("char"),
  44                          self_scm (),
  45                          gh_int2scm (index_to_ascii (idx)));
  46       b = get_indexed_char (idx);
  47     }
  48
  49   Stencil q (b, expr);
  50   return q;
  51 }
  52
  53 Font_metric::Font_metric ()
  54 {
  55   description_ = SCM_EOL;
  56   self_scm_ = SCM_EOL;
  57   smobify_self ();
  58 }
  59
  60 Font_metric::Font_metric (Font_metric const &)
  61 {
  62 }
  63
  64
  65 Font_metric::~Font_metric ()
  66 {
  67 }
  68
  69 int
  70 Font_metric::count () const
  71 {
  72   return 0;
  73 }
  74
  75 Box
  76 Font_metric::get_ascii_char (int) const
  77 {
  78   return Box (Interval (0, 0), Interval (0, 0));
  79 }
  80
  81 Box
  82 Font_metric::get_indexed_char (int k) const
  83 {
  84   return get_ascii_char (k);
  85 }
  86
  87 int
  88 Font_metric::name_to_index (String) const
  89 {
  90   return -1;
  91 }
  92
  93 Offset
  94 Font_metric::get_indexed_wxwy (int )const
  95 {
  96   return Offset (0, 0);
  97 }
  98
  99 void
 100 Font_metric::derived_mark ()const
 101 {
 102 }
 103
 104 SCM
 105 Font_metric::mark_smob (SCM s)
 106 {
 107   Font_metric *m = (Font_metric*) SCM_CELL_WORD_1 (s);
 108   m->derived_mark ();
 109   return m->description_;
 110 }
 111
 112 int
 113 Font_metric::print_smob (SCM s, SCM port, scm_print_state *)
 114 {
 115   Font_metric *m = unsmob_metrics (s);
 116   scm_puts ("#<", port);
 117   scm_puts (classname (m), port);
 118   scm_puts (" ", port);
 119   scm_write (m->description_, port);
 120   scm_puts (">", port);
 121   return 1;
 122 }
 123
 124
 125
 126 IMPLEMENT_SMOBS (Font_metric);
 127 IMPLEMENT_DEFAULT_EQUAL_P (Font_metric);
 128 IMPLEMENT_TYPE_P (Font_metric, "ly:font-metric?");
 129
 130
 131 LY_DEFINE (ly_find_glyph_by_name, "ly:find-glyph-by-name",
 132            2, 0, 0,
 133           (SCM font, SCM name),
 134           "This function retrieves a Stencil for the glyph named @var{name} "
 135            "in "
 136            "@var{font}.  "
 137            "The font must be available as an AFM file. If the glyph "
 138            "is not found, @code{#f} is returned. ")
 139 {
 140   Font_metric *fm = unsmob_metrics (font);
 141   SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
 142   SCM_ASSERT_TYPE (gh_string_p (name), name, SCM_ARG2, __FUNCTION__, "string");
 143
 144   Stencil m = fm->find_by_name (ly_scm2string (name));
 145
 146   /* TODO: make optional argument for default if not found.  */
 147   return m.smobbed_copy ();
 148 }
 149
 150 LY_DEFINE (ly_get_glyph, "ly:get-glyph",
 151            2, 0, 0,
 152           (SCM font, SCM index),
 153            "Retrieve a Stencil for the glyph numbered @var{index} "
 154            "in @var{font}.")
 155 {
 156   Font_metric *fm = unsmob_metrics (font);
 157   SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
 158   SCM_ASSERT_TYPE (gh_number_p (index), index, SCM_ARG2, __FUNCTION__, "number");
 159
 160   return fm->get_ascii_char_stencil (gh_scm2int (index)).smobbed_copy ();
 161 }
 162
 163 LY_DEFINE (ly_text_dimension,"ly:text-dimension",
 164            2, 0, 0,
 165           (SCM font, SCM text),
 166           "Given the font metric in @var{font} and the string @var{text}, "
 167            "compute the extents of that text in that font.  "
 168            "The return value is a pair of number-pairs.")
 169 {
 170   Box b;
 171   Modified_font_metric*fm = dynamic_cast<Modified_font_metric*>
 172     (unsmob_metrics (font));
 173   SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "modified font metric");
 174   SCM_ASSERT_TYPE (gh_string_p (text), text, SCM_ARG2, __FUNCTION__, "string");
 175
 176   b = fm->text_dimension (ly_scm2string (text));
 177
 178   return gh_cons (ly_interval2scm (b[X_AXIS]), ly_interval2scm (b[Y_AXIS]));
 179 }
 180
 181 LY_DEFINE (ly_font_name,"ly:font-name",
 182            1, 0, 0,
 183            (SCM font),
 184            "Given the font metric @var{font}, "
 185            "return the corresponding file name.")
 186 {
 187   Font_metric *fm = unsmob_metrics (font);
 188   SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
 189   return gh_car (fm->description_);
 190 }
 191
 192 LY_DEFINE (ly_font_magnification,"ly:font-magnification", 1 , 0, 0,
 193           (SCM font),
 194            "Given the font metric @var{font}, return the "
 195            "magnification, relative to the current outputscale.")
 196 {
 197   Font_metric *fm = unsmob_metrics (font);
 198   SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
 199   return gh_cdr (fm->description_);
 200 }
 201
 202 LY_DEFINE (ly_font_design_size,"ly:font-design-size", 1 , 0, 0,
 203           (SCM font),
 204            "Given the font metric @var{font}, return the "
 205            "design size, relative to the current outputscale.")
 206 {
 207   Font_metric *fm = unsmob_metrics (font);
 208   SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
 209   return gh_double2scm (fm->design_size ());
 210 }
 211
 212
 213
 214 int
 215 Font_metric::index_to_ascii (int i) const
 216 {
 217   return i;
 218 }
 219
 220 Stencil
 221 Font_metric::get_ascii_char_stencil (int code) const
 222 {
 223   SCM at = scm_list_2 (ly_symbol2scm ("char"), gh_int2scm (code));
 224   at = fontify_atom (this, at);
 225   Box b = get_ascii_char (code);
 226   return Stencil (b, at);
 227 }
 228
 229 Stencil
 230 Font_metric::get_indexed_char_stencil (int code) const
 231 {
 232   SCM at = scm_list_2 (ly_symbol2scm ("char"), gh_int2scm (code));
 233   at = fontify_atom (this, at);
 234   Box b = get_indexed_char (code);
 235   return Stencil (b, at);
 236 }
 237
 238 int
 239 /*Font_metric::*/
 240 get_encoded_index (Font_metric *m, String input_coding, int code)
 241 {
 242   String font_coding = m->coding_scheme ();
 243   if (font_coding == input_coding)
 244     return code;
 245   SCM s = scm_call_3 (ly_scheme_function ("encoded-index"),
 246                       scm_makfrom0str (input_coding.to_str0 ()),
 247                       scm_makfrom0str (font_coding.to_str0 ()),
 248                       scm_int2num (code));
 249   return gh_scm2int (s);
 250 }