2 font-select.cc -- implement property -> font_metric routines.
4 source file of the GNU LilyPond music typesetter
6 (c) 2003--2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
11 #include "dimensions.hh"
12 #include "all-font-metrics.hh"
13 #include "output-def.hh"
14 #include "font-interface.hh"
16 #include "pango-font.hh"
20 wild_compare (SCM field_val, SCM val)
22 return (val == SCM_BOOL_F
23 || field_val == ly_symbol2scm ("*")
28 get_font_by_design_size (Output_def *layout, Real requested,
31 int n = SCM_VECTOR_LENGTH (font_vector);
33 Real last_size = -1e6;
36 String pango_description_string;
39 SCM entry = SCM_VECTOR_REF (font_vector, i);
41 if (scm_promise_p (entry) == SCM_BOOL_T)
43 Font_metric *fm = unsmob_metrics (scm_force (entry));
44 size = fm->design_size ();
47 else if (scm_is_pair (entry)
48 && scm_is_number (scm_car (entry))
49 && scm_is_string (scm_cdr (entry)))
51 size = scm_to_double (scm_car (entry));
52 pango_description_string
53 = ly_scm2string (scm_cdr (entry));
66 if ((requested / last_size) < (size / requested))
74 if (pango_description_string != "")
77 PangoFontDescription *description
78 = pango_font_description_from_string (pango_description_string.to_str0 ());
79 fm = all_fonts_global->find_pango_font (description);
81 error ("Trying to retrieve pango font without HAVE_PANGO_FT2.");
86 fm = unsmob_metrics (scm_force (SCM_VECTOR_REF (font_vector, i)));
89 return find_scaled_font (layout, fm, requested / size);
93 get_font_by_mag_step (Output_def *layout, Real requested_step,
94 SCM font_vector, Real default_size)
96 return get_font_by_design_size (layout, default_size
97 * pow (2.0, requested_step / 6.0),
102 properties_to_font_size_family (SCM fonts, SCM alist_chain)
104 return scm_call_2 (ly_lily_module_constant ("lookup-font"), fonts, alist_chain);
108 select_encoded_font (Output_def *layout, SCM chain)
110 SCM name = ly_chain_assoc (ly_symbol2scm ("font-name"), chain);
112 if (!scm_is_pair (name) || !scm_is_string (scm_cdr (name)))
114 SCM fonts = layout->lookup_variable (ly_symbol2scm ("fonts"));
115 name = properties_to_font_size_family (fonts, chain);
118 name = scm_cdr (name);
120 if (scm_is_string (name))
122 SCM mag = ly_chain_assoc (ly_symbol2scm ("font-magnification"), chain);
123 Real rmag = (scm_is_pair (mag)
124 ? robust_scm2double (scm_cdr (mag), 1.0)
126 Font_metric *fm = all_fonts_global->find_font (ly_scm2string (name));
128 return find_scaled_font (layout, fm, rmag);
130 else if (scm_instance_p (name))
132 SCM base_size = scm_slot_ref (name, ly_symbol2scm ("default-size"));
133 SCM vec = scm_slot_ref (name, ly_symbol2scm ("size-vector"));
135 SCM font_size = ly_chain_assoc (ly_symbol2scm ("font-size"), chain);
137 if (scm_is_pair (font_size))
138 req = scm_to_double (scm_cdr (font_size));
140 return get_font_by_mag_step (layout, req, vec,
141 scm_to_double (base_size));
149 select_font (Output_def *layout, SCM chain)
151 return select_encoded_font (layout, chain);