Use scalar instead of embedded_scm for context mod overrides.
[lilypond/mpolesky.git] / lily / pango-select.cc
blob29686d44ddce44a8799fa59365870bd34723e3bd
1 /*
2 pango-select.cc -- implement lily font selection for Pango_fonts.
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
7 */
9 #include "dimensions.hh"
10 #include "all-font-metrics.hh"
11 #include "output-def.hh"
12 #include "pango-font.hh"
14 PangoFontDescription *
15 properties_to_pango_description (SCM chain, Real text_size)
17 SCM name = ly_chain_assoc_get (ly_symbol2scm ("font-name"), chain, SCM_BOOL_F);
19 PangoFontDescription *description = 0;
20 if (scm_is_string (name))
22 string name_str = ly_scm2string (name);
23 description = pango_font_description_from_string (name_str.c_str ());
25 else
27 SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
28 SCM_BOOL_F);
29 SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
30 SCM_BOOL_F);
32 SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
33 SCM_BOOL_F);
34 SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
35 SCM_BOOL_F);
37 description
38 = symbols_to_pango_font_description (family, style, variant, weight,
39 SCM_BOOL_F);
42 Real step = robust_scm2double (ly_chain_assoc_get (ly_symbol2scm ("font-size"), chain, SCM_BOOL_F),
43 0.0);
44 Real size = text_size * pow (2.0, step / 6.0);
46 pango_font_description_set_size (description, gint (size * PANGO_SCALE));
47 return description;
50 Font_metric *
51 select_pango_font (Output_def *layout, SCM chain)
53 PangoFontDescription *pfd
54 = properties_to_pango_description (chain,
55 point_constant
56 * layout->get_dimension (ly_symbol2scm ("text-font-size")));
58 char *str = pango_font_description_to_string (pfd);
59 SCM scm_str = scm_from_locale_string (str);
60 g_free (str);
61 pango_font_description_free (pfd);
63 return find_pango_font (layout, scm_str, 1.0);
66 PangoStyle
67 symbol_to_pango_style (SCM style)
69 PangoStyle pstyle = PANGO_STYLE_NORMAL;
70 if (style == ly_symbol2scm ("italic"))
71 pstyle = PANGO_STYLE_ITALIC;
72 else if (style == ly_symbol2scm ("oblique")
73 || style == ly_symbol2scm ("slanted"))
74 pstyle = PANGO_STYLE_OBLIQUE;
76 return pstyle;
79 PangoVariant
80 symbol_to_pango_variant (SCM variant)
82 PangoVariant pvariant = PANGO_VARIANT_NORMAL;
83 if (variant == ly_symbol2scm ("caps"))
84 pvariant = PANGO_VARIANT_SMALL_CAPS;
85 return pvariant;
88 PangoWeight
89 symbol_to_pango_weight (SCM weight)
91 PangoWeight pw = PANGO_WEIGHT_NORMAL;
92 if (weight == ly_symbol2scm ("bold"))
93 pw = PANGO_WEIGHT_BOLD;
94 if (weight == ly_symbol2scm ("heavy"))
95 pw = PANGO_WEIGHT_HEAVY;
96 if (weight == ly_symbol2scm ("ultrabold"))
97 pw = PANGO_WEIGHT_ULTRABOLD;
98 if (weight == ly_symbol2scm ("light"))
99 pw = PANGO_WEIGHT_LIGHT;
100 if (weight == ly_symbol2scm ("ultralight"))
101 pw = PANGO_WEIGHT_ULTRALIGHT;
103 return pw;
106 PangoStretch
107 symbol_to_pango_stretch (SCM) // stretch)
109 PangoStretch ps = PANGO_STRETCH_NORMAL;
112 // TODO
114 PANGO_STRETCH_ULTRA_CONDENSED,
115 PANGO_STRETCH_EXTRA_CONDENSED,
116 PANGO_STRETCH_CONDENSED,
117 PANGO_STRETCH_SEMI_CONDENSED,
119 PANGO_STRETCH_SEMI_EXPANDED,
120 PANGO_STRETCH_EXPANDED,
121 PANGO_STRETCH_EXTRA_EXPANDED,
122 PANGO_STRETCH_ULTRA_EXPANDED
124 return ps;
127 PangoFontDescription *
128 symbols_to_pango_font_description (SCM family,
129 SCM style,
130 SCM variant,
131 SCM weight,
132 SCM stretch)
134 PangoFontDescription *description = pango_font_description_new ();
136 string family_str = "roman";
137 if (scm_is_symbol (family))
138 family_str = ly_symbol2string (family);
139 else if (scm_is_string (family))
140 family_str = ly_scm2string (family);
142 pango_font_description_set_family (description,
143 family_str.c_str ());
144 pango_font_description_set_style (description,
145 symbol_to_pango_style (style));
146 pango_font_description_set_variant (description,
147 symbol_to_pango_variant (variant));
148 pango_font_description_set_weight (description,
149 symbol_to_pango_weight (weight));
150 pango_font_description_set_stretch (description,
151 symbol_to_pango_stretch (stretch));
153 return description;