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>
12 #include "paper-def.hh"
13 #include "font-interface.hh"
16 LY_DEFINE (ly_paper_get_font, "ly:paper-get-font", 2, 0, 0,
17 (SCM paper, SCM chain),
19 "Return a font metric satisfying the font-qualifiers "
20 "in the alist chain @var{chain}.\n"
21 "(An alist chain is a list of alists, containing grob properties).\n")
23 Paper_def *pap = unsmob_paper (paper);
24 SCM_ASSERT_TYPE (pap, paper, SCM_ARG1, __FUNCTION__, "paper definition");
26 Font_metric *fm = select_font (pap, chain);
27 return fm->self_scm ();
30 LY_DEFINE (ly_paper_get_number, "ly:paper-get-number", 2, 0, 0,
31 (SCM paper, SCM name),
32 "Return the paper variable @var{name}.")
34 Paper_def *pap = unsmob_paper (paper);
35 SCM_ASSERT_TYPE (pap, paper, SCM_ARG1, __FUNCTION__, "paper definition");
36 return gh_double2scm (pap->get_realvar (name));
40 wild_compare (SCM field_val, SCM val)
42 return (val == SCM_BOOL_F || field_val == ly_symbol2scm ("*") || field_val == val);
45 get_font_by_design_size (Paper_def* paper, Real requested,
48 int n = SCM_VECTOR_LENGTH (font_vector);
50 Real last_size = -1e6;
55 size = gh_scm2double (gh_car (SCM_VECTOR_REF (font_vector, i)));
67 if ((requested / last_size) < (size / requested))
74 return paper->find_font (gh_cdr (SCM_VECTOR_REF (font_vector, i)),
80 get_font_by_mag_step (Paper_def* paper, Real requested_step,
81 SCM font_vector, Real default_size)
83 return get_font_by_design_size (paper,
84 default_size * pow (2.0, requested_step / 6.0),
91 We can probably get more efficiency points if we preprocess FONTS
92 to make lookup easier.
95 properties_to_font_size_family (SCM fonts, SCM alist_chain)
97 SCM shape = SCM_BOOL_F;
98 SCM family = SCM_BOOL_F;
99 SCM series = SCM_BOOL_F;
101 shape = ly_assoc_chain (ly_symbol2scm ("font-shape"), alist_chain);
102 family = ly_assoc_chain (ly_symbol2scm ("font-family"), alist_chain);
103 series = ly_assoc_chain (ly_symbol2scm ("font-series"), alist_chain);
105 if (gh_pair_p (shape))
106 shape = ly_cdr (shape);
107 if (gh_pair_p (family))
108 family = ly_cdr (family);
109 if (gh_pair_p (series))
110 series = ly_cdr (series);
113 for (SCM s = fonts ; gh_pair_p (s); s = ly_cdr (s))
115 SCM qlist = ly_caar (s);
117 if (!wild_compare (SCM_VECTOR_REF (qlist, 0), series))
119 if (!wild_compare (SCM_VECTOR_REF (qlist, 1), shape))
121 if (!wild_compare (SCM_VECTOR_REF (qlist, 2), family))
124 SCM qname = ly_cdar (s);
128 warning (_f ("cannot find font for: (%s %s %s)",
129 ly_symbol2string (series).to_str0 (),
130 ly_symbol2string (shape).to_str0 (),
131 ly_symbol2string (family).to_str0 ()));
133 scm_write (scm_list_n (shape, series , family,
134 SCM_UNDEFINED), scm_current_error_port ());
135 scm_flush (scm_current_error_port ());
137 return scm_makfrom0str ("cmr10");
142 select_font (Paper_def *paper, SCM chain)
144 SCM name = ly_assoc_chain (ly_symbol2scm ("font-name"), chain);
146 if (!gh_pair_p (name) || !gh_string_p (gh_cdr (name)))
148 SCM fonts = paper->lookup_variable (ly_symbol2scm ("fonts"));
149 name = properties_to_font_size_family (fonts, chain);
152 name = gh_cdr (name);
155 if (gh_string_p (name))
157 SCM mag = ly_assoc_chain (ly_symbol2scm ("font-magnification"), chain);
159 Real rmag = gh_pair_p (mag) ? robust_scm2double (gh_cdr (mag), 1.0) : 1;
161 return paper->find_font (name, rmag);
163 else if (gh_pair_p (name)) // (DEFAULT . FONT-VEC) pair
165 SCM vec = gh_cdr (name);
166 SCM base_size = gh_car (name);
168 SCM font_size = ly_assoc_chain (ly_symbol2scm ("font-size"), chain);
170 if (gh_pair_p (font_size))
171 req = gh_scm2double (ly_cdr (font_size));
173 return get_font_by_mag_step (paper, req,
174 vec, gh_scm2double (base_size));