lily/pango-select.cc

   1 /*
   2   pango-select.cc --  implement lily font selection for Pango_fonts.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9 #include <math.h>
  10
  11 #include "dimensions.hh"
  12 #include "all-font-metrics.hh"
  13 #include "output-def.hh"
  14 #include "pango-font.hh"
  15
  16 Font_metric *
  17 select_pango_font (Output_def *layout, SCM chain)
  18 {
  19   SCM name = ly_chain_assoc (ly_symbol2scm ("font-name"), chain);
  20
  21   PangoFontDescription *description = 0;
  22   if (scm_is_pair (name) && scm_is_string (scm_cdr (name)))
  23     {
  24       String name_str = ly_scm2string (scm_cdr (name));
  25       description = pango_font_description_from_string (name_str.to_str0 ());
  26     }
  27   else
  28     {
  29       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  30                                        SCM_BOOL_F);
  31       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  32                                         SCM_BOOL_F);
  33
  34       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  35                                       SCM_BOOL_F);
  36       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  37                                        SCM_BOOL_F);
  38
  39       description
  40         = symbols_to_pango_font_description (family, style, variant, weight,
  41                                              SCM_BOOL_F);
  42     }
  43
  44   Real step = robust_scm2double (ly_symbol2scm ("font-size"), 0.0);
  45   Real size = layout->get_dimension (ly_symbol2scm ("text-font-size"))
  46     * pow (2.0, step / 6.0) * point_constant;
  47   pango_font_description_set_size (description,
  48                                    gint (size * PANGO_SCALE));
  49
  50   Font_metric * fm = all_fonts_global->find_pango_font (description);
  51
  52   return find_scaled_font (layout, fm, 1.0,
  53                            ly_symbol2scm ("latin1"),
  54                            ly_symbol2scm ("latin1"));
  55 }
  56
  57
  58 PangoStyle
  59 symbol_to_pango_style (SCM style)
  60 {
  61   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  62   if (style == ly_symbol2scm ("italic"))
  63     {
  64       pstyle = PANGO_STYLE_NORMAL;
  65     }
  66   else if (style == ly_symbol2scm ("oblique")
  67            || style == ly_symbol2scm ("slanted")
  68            )
  69     {
  70       pstyle = PANGO_STYLE_OBLIQUE;
  71     }
  72
  73   return pstyle;
  74 }
  75
  76 PangoVariant
  77 symbol_to_pango_variant (SCM variant)
  78 {
  79   PangoVariant pvariant;
  80   if (variant == ly_symbol2scm ("caps"))
  81     {
  82       pvariant = PANGO_VARIANT_SMALL_CAPS;
  83     }
  84   return pvariant;
  85 }
  86
  87
  88 PangoWeight
  89 symbol_to_pango_weight (SCM weight)
  90 {
  91   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  92   if (weight == ly_symbol2scm ("bold"))
  93     {
  94       pw = PANGO_WEIGHT_BOLD;
  95     }
  96   if (weight == ly_symbol2scm ("heavy"))
  97     {
  98       pw = PANGO_WEIGHT_HEAVY;
  99     }
 100   if (weight == ly_symbol2scm ("ultrabold"))
 101     {
 102       pw = PANGO_WEIGHT_ULTRABOLD;
 103     }
 104   if (weight == ly_symbol2scm ("light"))
 105     {
 106       pw = PANGO_WEIGHT_LIGHT;
 107     }
 108   if (weight == ly_symbol2scm ("ultralight"))
 109     {
 110       pw = PANGO_WEIGHT_ULTRALIGHT;
 111     }
 112
 113   return pw;
 114 }
 115
 116 PangoStretch
 117 symbol_to_pango_stretch (SCM) //  stretch)
 118 {
 119   PangoStretch ps = PANGO_STRETCH_NORMAL;
 120
 121   /*
 122     // TODO
 123
 124   PANGO_STRETCH_ULTRA_CONDENSED,
 125   PANGO_STRETCH_EXTRA_CONDENSED,
 126   PANGO_STRETCH_CONDENSED,
 127   PANGO_STRETCH_SEMI_CONDENSED,
 128
 129   PANGO_STRETCH_SEMI_EXPANDED,
 130   PANGO_STRETCH_EXPANDED,
 131   PANGO_STRETCH_EXTRA_EXPANDED,
 132   PANGO_STRETCH_ULTRA_EXPANDED
 133   */
 134   return ps;
 135 }
 136
 137
 138
 139 PangoFontDescription*
 140 symbols_to_pango_font_description(SCM family,
 141                                   SCM style,
 142                                   SCM variant,
 143                                   SCM weight,
 144                                   SCM stretch)
 145 {
 146   PangoFontDescription * description = pango_font_description_new ();
 147
 148   String family_str = scm_is_symbol (family)
 149     ? ly_symbol2string (family)
 150     : String("roman");
 151   pango_font_description_set_family (description,
 152                                      family_str.to_str0 ());
 153   pango_font_description_set_style (description,
 154                                     symbol_to_pango_style (style));
 155   pango_font_description_set_variant (description,
 156                                       symbol_to_pango_variant (variant));
 157   pango_font_description_set_weight (description,
 158                                      symbol_to_pango_weight (weight));
 159   pango_font_description_set_stretch (description,
 160                                       symbol_to_pango_stretch (stretch));
 161
 162   return description;
 163 }