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 }
  54
  55
  56 PangoStyle
  57 symbol_to_pango_style (SCM style)
  58 {
  59   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  60   if (style == ly_symbol2scm ("italic"))
  61     {
  62       pstyle = PANGO_STYLE_NORMAL;
  63     }
  64   else if (style == ly_symbol2scm ("oblique")
  65            || style == ly_symbol2scm ("slanted")
  66            )
  67     {
  68       pstyle = PANGO_STYLE_OBLIQUE;
  69     }
  70
  71   return pstyle;
  72 }
  73
  74 PangoVariant
  75 symbol_to_pango_variant (SCM variant)
  76 {
  77   PangoVariant pvariant;
  78   if (variant == ly_symbol2scm ("caps"))
  79     {
  80       pvariant = PANGO_VARIANT_SMALL_CAPS;
  81     }
  82   return pvariant;
  83 }
  84
  85
  86 PangoWeight
  87 symbol_to_pango_weight (SCM weight)
  88 {
  89   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  90   if (weight == ly_symbol2scm ("bold"))
  91     {
  92       pw = PANGO_WEIGHT_BOLD;
  93     }
  94   if (weight == ly_symbol2scm ("heavy"))
  95     {
  96       pw = PANGO_WEIGHT_HEAVY;
  97     }
  98   if (weight == ly_symbol2scm ("ultrabold"))
  99     {
 100       pw = PANGO_WEIGHT_ULTRABOLD;
 101     }
 102   if (weight == ly_symbol2scm ("light"))
 103     {
 104       pw = PANGO_WEIGHT_LIGHT;
 105     }
 106   if (weight == ly_symbol2scm ("ultralight"))
 107     {
 108       pw = PANGO_WEIGHT_ULTRALIGHT;
 109     }
 110
 111   return pw;
 112 }
 113
 114 PangoStretch
 115 symbol_to_pango_stretch (SCM) //  stretch)
 116 {
 117   PangoStretch ps = PANGO_STRETCH_NORMAL;
 118
 119   /*
 120     // TODO
 121
 122   PANGO_STRETCH_ULTRA_CONDENSED,
 123   PANGO_STRETCH_EXTRA_CONDENSED,
 124   PANGO_STRETCH_CONDENSED,
 125   PANGO_STRETCH_SEMI_CONDENSED,
 126
 127   PANGO_STRETCH_SEMI_EXPANDED,
 128   PANGO_STRETCH_EXPANDED,
 129   PANGO_STRETCH_EXTRA_EXPANDED,
 130   PANGO_STRETCH_ULTRA_EXPANDED
 131   */
 132   return ps;
 133 }
 134
 135
 136
 137 PangoFontDescription*
 138 symbols_to_pango_font_description(SCM family,
 139                                   SCM style,
 140                                   SCM variant,
 141                                   SCM weight,
 142                                   SCM stretch)
 143 {
 144   PangoFontDescription * description = pango_font_description_new ();
 145
 146   String family_str = scm_is_symbol (family)
 147     ? ly_symbol2string (family)
 148     : String("roman");
 149   pango_font_description_set_family (description,
 150                                      family_str.to_str0 ());
 151   pango_font_description_set_style (description,
 152                                     symbol_to_pango_style (style));
 153   pango_font_description_set_variant (description,
 154                                       symbol_to_pango_variant (variant));
 155   pango_font_description_set_weight (description,
 156                                      symbol_to_pango_weight (weight));
 157   pango_font_description_set_stretch (description,
 158                                       symbol_to_pango_stretch (stretch));
 159
 160   return description;
 161 }