2 font-metric.cc -- implement Font_metric
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 Mats Bengtsson <matsb@s3.kth.se> (the ugly TeX parsing in text_dimension)
15 #include "molecule.hh"
16 #include "ly-smobs.icc"
17 #include "font-metric.hh"
21 Font_metric::text_dimension (String text) const
26 for (int i = 0; i < text.length (); i++)
32 // accent marks use width of base letter
33 if (i +1 < text.length ())
35 if (text[i+1]=='\'' || text[i+1]=='`' || text[i+1]=='"' ||
41 // for string width \\ is a \ and \_ is a _.
42 if (text[i+1]=='\\' || text[i+1]=='_')
48 for (i++; (i < text.length ()) && !isspace (text[i])
49 && text[i]!='{' && text[i]!='}'; i++)
52 i--; // Compensate for the increment in the outer loop!
54 case '{': // Skip '{' and '}'
59 Box b = get_char ((unsigned char)text[i]);
61 // Ugh, use the width of 'x' for unknown characters
62 if (b[X_AXIS].length () == 0)
63 b = get_char ((unsigned char)'x');
65 w += b[X_AXIS].length ();
66 ydims.unite (b[Y_AXIS]);
71 ydims = Interval (0,0);
73 return Box (Interval (0, w), ydims);
78 Font_metric::~Font_metric ()
82 Font_metric::Font_metric ()
84 description_ = SCM_EOL;
89 Font_metric::Font_metric (Font_metric const &)
94 Font_metric::count () const
100 Font_metric::get_char (int)const
102 return Box (Interval (0,0),Interval (0,0));
107 Font_metric::derived_mark ()const
115 Font_metric::mark_smob (SCM s)
117 Font_metric * m = (Font_metric*) SCM_CELL_WORD_1 (s);
120 return m->description_;
124 Font_metric::print_smob (SCM s, SCM port, scm_print_state *)
126 Font_metric *m = unsmob_metrics (s);
127 scm_puts ("#<Font_metric ", port);
128 scm_write (m->description_, port);
129 scm_puts (">", port);
135 IMPLEMENT_SMOBS (Font_metric);
136 IMPLEMENT_DEFAULT_EQUAL_P (Font_metric);
137 IMPLEMENT_TYPE_P (Font_metric, "ly:font-metric?");
140 Font_metric::find_by_name (String) const
146 LY_DEFINE(ly_find_glyph_by_name, "ly:find-glyph-by-name", 2 , 0, 0,
147 (SCM font, SCM name),
148 "This function retrieves a Molecule for the glyph named @var{name} in "
149 "@var{font}. The font must be available as an AFM file. If the glyph "
150 "is not found, #f is returned. ")
152 Font_metric *fm = unsmob_metrics (font);
153 SCM_ASSERT_TYPE(fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
154 SCM_ASSERT_TYPE(gh_string_p (name), name, SCM_ARG2, __FUNCTION__, "string");
156 Molecule m = fm->find_by_name (ly_scm2string (name));
159 TODO: make optional argument for default if not found.
162 return m.smobbed_copy ();
165 LY_DEFINE(ly_get_glyph, "ly:get-glyph", 2 , 0, 0,
166 (SCM font, SCM index),
167 "This function retrieves a Molecule for the glyph numbered @var{index} in "
170 Font_metric *fm = unsmob_metrics (font);
171 SCM_ASSERT_TYPE(fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
172 SCM_ASSERT_TYPE(gh_number_p (index), index, SCM_ARG2, __FUNCTION__, "number");
174 return fm->get_char_molecule (gh_scm2int (index)).smobbed_copy ();
177 LY_DEFINE(ly_text_dimension,"ly:text-dimension", 2 , 0, 0,
178 (SCM font, SCM text),
179 "Given the font metric in @var{font} and the string @var{text}, compute "
180 "the extents of that text in that font. The return value is a pair of "
184 Font_metric *fm = unsmob_metrics (font);
185 SCM_ASSERT_TYPE(fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
186 SCM_ASSERT_TYPE(gh_string_p (text), text, SCM_ARG2, __FUNCTION__, "string");
188 b = fm->text_dimension (ly_scm2string (text));
190 return gh_cons (ly_interval2scm (b[X_AXIS]), ly_interval2scm(b[Y_AXIS]));
194 Font_metric::get_char_molecule (int code) const
196 SCM at = scm_list_n (ly_symbol2scm ("char"), gh_int2scm (code),
198 at = fontify_atom (this, at);
199 Box b = get_char (code);
200 return Molecule (b, at);