lily/font-metric-scheme.cc

   1 /*
   2   font-metric-scheme.cc -- implement Font_metric scheme bindings
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "font-metric.hh"
  10
  11 #include "warn.hh"
  12 #include "stencil.hh"
  13 #include "modified-font-metric.hh"
  14
  15 LY_DEFINE (ly_font_get_glyph, "ly:font-get-glyph",
  16            2, 0, 0,
  17            (SCM font, SCM name),
  18            "Return a stencil from @var{font} for the glyph named @var{name}."
  19            "  If the glyph is not available, return an empty stencil.\n"
  20            "\n"
  21            "Note that this command can only be used to access glyphs from"
  22            " fonts loaded with @code{ly:system-font-load}; currently, this"
  23            " means either the Emmentaler or Aybabtu fonts, corresponding"
  24            " to the font encodings @code{fetaMusic} and @code{fetaBraces},"
  25            " respectively.")
  26 {
  27   Font_metric *fm = unsmob_metrics (font);
  28   LY_ASSERT_SMOB (Font_metric, font, 1);
  29   LY_ASSERT_TYPE (scm_is_string, name, 2);
  30
  31   Stencil m = fm->find_by_name (ly_scm2string (name));
  32
  33   /* TODO: make optional argument for default if not found.  */
  34   return m.smobbed_copy ();
  35 }
  36
  37 LY_DEFINE (ly_get_glyph, "ly:get-glyph",
  38            2, 0, 0,
  39            (SCM font, SCM index),
  40            "Retrieve a stencil for the glyph numbered @var{index}"
  41            " in @var{font}.\n"
  42            "\n"
  43            "Note that this command can only be used to access glyphs from"
  44            " fonts loaded with @code{ly:system-font-load}; currently, this"
  45            " means either the Emmentaler or Aybabtu fonts, corresponding"
  46            " to the font encodings @code{fetaMusic} and @code{fetaBraces},"
  47            " respectively.")
  48 {
  49   Font_metric *fm = unsmob_metrics (font);
  50   LY_ASSERT_SMOB (Font_metric, font, 1);
  51   LY_ASSERT_TYPE (scm_is_number, index,2);
  52
  53   return fm->get_ascii_char_stencil (scm_to_int (index)).smobbed_copy ();
  54 }
  55
  56 LY_DEFINE (ly_font_glyph_name_to_index, "ly:font-glyph-name-to-index",
  57            2, 0, 0,
  58            (SCM font, SCM name),
  59            "Return the index for @var{name} in @var{font}.\n"
  60            "\n"
  61            "Note that this command can only be used to access glyphs from"
  62            " fonts loaded with @code{ly:system-font-load}; currently, this"
  63            " means either the Emmentaler or Aybabtu fonts, corresponding"
  64            " to the font encodings @code{fetaMusic} and @code{fetaBraces},"
  65            " respectively.")
  66 {
  67   Font_metric *fm = unsmob_metrics (font);
  68   LY_ASSERT_SMOB (Font_metric, font, 1);
  69   LY_ASSERT_TYPE (scm_is_string, name, 2);
  70
  71   return scm_from_int (fm->name_to_index (ly_scm2string (name)));
  72 }
  73
  74 LY_DEFINE (ly_font_index_to_charcode, "ly:font-index-to-charcode",
  75            2, 0, 0,
  76            (SCM font, SCM index),
  77            "Return the character code for @var{index} in @var{font}.\n"
  78            "\n"
  79            "Note that this command can only be used to access glyphs from"
  80            " fonts loaded with @code{ly:system-font-load}; currently, this"
  81            " means either the Emmentaler or Aybabtu fonts, corresponding"
  82            " to the font encodings @code{fetaMusic} and @code{fetaBraces},"
  83            " respectively.")
  84 {
  85   Font_metric *fm = unsmob_metrics (font);
  86   LY_ASSERT_SMOB (Font_metric, font, 1);
  87   LY_ASSERT_TYPE (scm_is_integer, index, 2);
  88
  89   return scm_from_unsigned_integer (fm->index_to_charcode (scm_to_int (index)));
  90 }
  91
  92 LY_DEFINE (ly_font_glyph_name_to_charcode, "ly:font-glyph-name-to-charcode",
  93            2, 0, 0,
  94            (SCM font, SCM name),
  95            "Return the character code for glyph @var{name} in @var{font}.\n"
  96            "\n"
  97            "Note that this command can only be used to access glyphs from"
  98            " fonts loaded with @code{ly:system-font-load}; currently, this"
  99            " means either the Emmentaler or Aybabtu fonts, corresponding"
 100            " to the font encodings @code{fetaMusic} and @code{fetaBraces},"
 101            " respectively.")
 102 {
 103   Font_metric *fm = unsmob_metrics (font);
 104   LY_ASSERT_SMOB (Font_metric, font, 1);
 105   LY_ASSERT_TYPE (scm_is_string, name, 2);
 106
 107   return scm_from_unsigned_integer (fm->index_to_charcode (fm->name_to_index (ly_scm2string (name))));
 108 }
 109
 110 LY_DEFINE (ly_text_dimension, "ly:text-dimension",
 111            2, 0, 0,
 112            (SCM font, SCM text),
 113            "Given the font metric in @var{font} and the string @var{text},"
 114            " compute the extents of that text in that font.  The return"
 115            " value is a pair of number-pairs.")
 116 {
 117   Box b;
 118   Modified_font_metric *fm = dynamic_cast<Modified_font_metric *>
 119     (unsmob_metrics (font));
 120
 121   LY_ASSERT_SMOB (Font_metric, font, 1);
 122   LY_ASSERT_TYPE (scm_is_string, text, 2);
 123   Stencil stc (fm->text_stencil (ly_scm2string (text), false));
 124   return scm_cons (ly_interval2scm (stc.extent (X_AXIS)),
 125                    ly_interval2scm (stc.extent (Y_AXIS)));
 126 }
 127
 128
 129 /*
 130   TODO: when are non string retvals allowed?
 131  */
 132 LY_DEFINE (ly_font_file_name, "ly:font-file-name",
 133            1, 0, 0,
 134            (SCM font),
 135            "Given the font metric @var{font},"
 136            " return the corresponding file name.")
 137 {
 138   LY_ASSERT_SMOB (Font_metric, font, 1);
 139
 140   Font_metric *fm = unsmob_metrics (font);
 141   SCM name = fm->font_file_name ();
 142
 143   return name;
 144 }
 145
 146 LY_DEFINE (ly_font_name, "ly:font-name",
 147            1, 0, 0,
 148            (SCM font),
 149            "Given the font metric @var{font},"
 150            " return the corresponding name.")
 151 {
 152   LY_ASSERT_SMOB (Font_metric, font, 1);
 153   Font_metric *fm = unsmob_metrics (font);
 154
 155   return ly_string2scm (fm->font_name ());
 156 }
 157
 158 LY_DEFINE (ly_font_magnification, "ly:font-magnification", 1, 0, 0,
 159            (SCM font),
 160            "Given the font metric @var{font}, return the"
 161            " magnification, relative to the current output-scale.")
 162 {
 163   LY_ASSERT_SMOB (Font_metric, font, 1);
 164
 165   Font_metric *fm = unsmob_metrics (font);
 166   return scm_cdr (fm->description_);
 167 }
 168
 169 LY_DEFINE (ly_font_design_size, "ly:font-design-size", 1, 0, 0,
 170            (SCM font),
 171            "Given the font metric @var{font}, return the"
 172            " design size, relative to the current output-scale.")
 173 {
 174   LY_ASSERT_SMOB (Font_metric, font, 1);
 175
 176   Font_metric *fm = unsmob_metrics (font);
 177   return scm_from_double (fm->design_size ());
 178 }
 179