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--2007 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            "@var{font} must be available as an AFM file.  If the glyph "
  20            "is not available, return @code{#f}.")
  21 {
  22   Font_metric *fm = unsmob_metrics (font);
  23   LY_ASSERT_SMOB (Font_metric, font, 1);
  24   LY_ASSERT_TYPE (scm_is_string, name, 2);
  25
  26   Stencil m = fm->find_by_name (ly_scm2string (name));
  27
  28   /* TODO: make optional argument for default if not found.  */
  29   return m.smobbed_copy ();
  30 }
  31
  32 LY_DEFINE (ly_get_glyph, "ly:get-glyph",
  33            2, 0, 0,
  34            (SCM font, SCM index),
  35            "Retrieve a Stencil for the glyph numbered @var{index} "
  36            "in @var{font}.")
  37 {
  38   Font_metric *fm = unsmob_metrics (font);
  39   LY_ASSERT_SMOB (Font_metric, font, 1);
  40   LY_ASSERT_TYPE (scm_is_number, index,2);
  41
  42   return fm->get_ascii_char_stencil (scm_to_int (index)).smobbed_copy ();
  43 }
  44
  45 LY_DEFINE (ly_font_glyph_name_to_index, "ly:font-glyph-name-to-index",
  46            2, 0, 0,
  47            (SCM font, SCM name),
  48            "Return the index for @var{name} in @var{font}.")
  49 {
  50   Font_metric *fm = unsmob_metrics (font);
  51   LY_ASSERT_SMOB (Font_metric, font, 1);
  52   LY_ASSERT_TYPE (scm_is_string, name, 2);
  53
  54   return scm_from_int (fm->name_to_index (ly_scm2string (name)));
  55 }
  56
  57 LY_DEFINE (ly_font_index_to_charcode, "ly:font-index-to-charcode",
  58            2, 0, 0,
  59            (SCM font, SCM index),
  60            "Return the character code for @var{index} @var{font}.")
  61 {
  62   Font_metric *fm = unsmob_metrics (font);
  63   LY_ASSERT_SMOB (Font_metric, font, 1);
  64   LY_ASSERT_TYPE (scm_is_integer, index, 2);
  65
  66   return scm_from_unsigned_integer (fm->index_to_charcode (scm_to_int (index)));
  67 }
  68
  69 LY_DEFINE (ly_font_glyph_name_to_charcode, "ly:font-glyph-name-to-charcode",
  70            2, 0, 0,
  71            (SCM font, SCM name),
  72            "Return the character code for glyph @var{name} in @var{font}.")
  73 {
  74   Font_metric *fm = unsmob_metrics (font);
  75   LY_ASSERT_SMOB (Font_metric, font, 1);
  76   LY_ASSERT_TYPE (scm_is_string, name, 2);
  77
  78   return scm_from_unsigned_integer (fm->index_to_charcode (fm->name_to_index (ly_scm2string (name))));
  79 }
  80
  81 LY_DEFINE (ly_text_dimension, "ly:text-dimension",
  82            2, 0, 0,
  83            (SCM font, SCM text),
  84            "Given the font metric in @var{font} and the string @var{text}, "
  85            "compute the extents of that text in that font.  "
  86            "The return value is a pair of number-pairs.")
  87 {
  88   Box b;
  89   Modified_font_metric *fm = dynamic_cast<Modified_font_metric *>
  90     (unsmob_metrics (font));
  91
  92   LY_ASSERT_SMOB (Font_metric, font, 1);
  93   LY_ASSERT_TYPE (scm_is_string, text, 2);
  94   Stencil stc (fm->text_stencil (ly_scm2string (text)));
  95   return scm_cons (ly_interval2scm (stc.extent (X_AXIS)),
  96                    ly_interval2scm (stc.extent (Y_AXIS)));
  97 }
  98
  99
 100 /*
 101   TODO: when are non string retvals allowed?
 102  */
 103 LY_DEFINE (ly_font_file_name, "ly:font-file-name",
 104            1, 0, 0,
 105            (SCM font),
 106            "Given the font metric @var{font}, "
 107            "return the corresponding file name.")
 108 {
 109   LY_ASSERT_SMOB (Font_metric, font, 1);
 110
 111   Font_metric *fm = unsmob_metrics (font);
 112   SCM name = fm->font_file_name ();
 113
 114   return name;
 115 }
 116
 117 LY_DEFINE (ly_font_name, "ly:font-name",
 118            1, 0, 0,
 119            (SCM font),
 120            "Given the font metric @var{font}, "
 121            "return the corresponding name.")
 122 {
 123   LY_ASSERT_SMOB (Font_metric, font, 1);
 124   Font_metric *fm = unsmob_metrics (font);
 125
 126   return ly_string2scm (fm->font_name ());
 127 }
 128
 129 LY_DEFINE (ly_font_magnification, "ly:font-magnification", 1, 0, 0,
 130            (SCM font),
 131            "Given the font metric @var{font}, return the "
 132            "magnification, relative to the current output-scale.")
 133 {
 134   LY_ASSERT_SMOB (Font_metric, font, 1);
 135
 136   Font_metric *fm = unsmob_metrics (font);
 137   return scm_cdr (fm->description_);
 138 }
 139
 140 LY_DEFINE (ly_font_design_size, "ly:font-design-size", 1, 0, 0,
 141            (SCM font),
 142            "Given the font metric @var{font}, return the "
 143            "design size, relative to the current output-scale.")
 144 {
 145   LY_ASSERT_SMOB (Font_metric, font, 1);
 146
 147   Font_metric *fm = unsmob_metrics (font);
 148   return scm_from_double (fm->design_size ());
 149 }
 150