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--2005 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
  17 PangoFontDescription *
  18 properties_to_pango_description (SCM chain, Real text_size)
  19 {
  20   SCM name = ly_chain_assoc (ly_symbol2scm ("font-name"), chain);
  21
  22   PangoFontDescription *description = 0;
  23   if (scm_is_pair (name) && scm_is_string (scm_cdr (name)))
  24     {
  25       String name_str = ly_scm2string (scm_cdr (name));
  26       description = pango_font_description_from_string (name_str.to_str0 ());
  27     }
  28   else
  29     {
  30       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  31                                        SCM_BOOL_F);
  32       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  33                                         SCM_BOOL_F);
  34
  35       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  36                                       SCM_BOOL_F);
  37       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  38                                        SCM_BOOL_F);
  39
  40       description
  41         = symbols_to_pango_font_description (family, style, variant, weight,
  42                                              SCM_BOOL_F);
  43     }
  44
  45   Real step = robust_scm2double (ly_symbol2scm ("font-size"), 0.0);
  46   Real size = text_size * pow (2.0, step / 6.0);
  47
  48   pango_font_description_set_size (description,
  49                                    gint (size * PANGO_SCALE));
  50   return description;
  51 }
  52
  53 Font_metric *
  54 select_pango_font (Output_def *layout, SCM chain)
  55 {
  56   PangoFontDescription *pfd = properties_to_pango_description (chain,
  57                                                                point_constant * layout->get_dimension (ly_symbol2scm ("text-font-size")));
  58
  59   return all_fonts_global->find_pango_font (pfd, 1.0, output_scale (layout));
  60 }
  61
  62 PangoStyle
  63 symbol_to_pango_style (SCM style)
  64 {
  65   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  66   if (style == ly_symbol2scm ("italic"))
  67     {
  68       pstyle = PANGO_STYLE_ITALIC;
  69     }
  70   else if (style == ly_symbol2scm ("oblique")
  71            || style == ly_symbol2scm ("slanted")
  72            )
  73     {
  74       pstyle = PANGO_STYLE_OBLIQUE;
  75     }
  76
  77   return pstyle;
  78 }
  79
  80 PangoVariant
  81 symbol_to_pango_variant (SCM variant)
  82 {
  83   PangoVariant pvariant = PANGO_VARIANT_NORMAL;
  84   if (variant == ly_symbol2scm ("caps"))
  85     {
  86       pvariant = PANGO_VARIANT_SMALL_CAPS;
  87     }
  88   return pvariant;
  89 }
  90
  91
  92 PangoWeight
  93 symbol_to_pango_weight (SCM weight)
  94 {
  95   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  96   if (weight == ly_symbol2scm ("bold"))
  97     {
  98       pw = PANGO_WEIGHT_BOLD;
  99     }
 100   if (weight == ly_symbol2scm ("heavy"))
 101     {
 102       pw = PANGO_WEIGHT_HEAVY;
 103     }
 104   if (weight == ly_symbol2scm ("ultrabold"))
 105     {
 106       pw = PANGO_WEIGHT_ULTRABOLD;
 107     }
 108   if (weight == ly_symbol2scm ("light"))
 109     {
 110       pw = PANGO_WEIGHT_LIGHT;
 111     }
 112   if (weight == ly_symbol2scm ("ultralight"))
 113     {
 114       pw = PANGO_WEIGHT_ULTRALIGHT;
 115     }
 116
 117   return pw;
 118 }
 119
 120 PangoStretch
 121 symbol_to_pango_stretch (SCM) //  stretch)
 122 {
 123   PangoStretch ps = PANGO_STRETCH_NORMAL;
 124
 125   /*
 126     // TODO
 127
 128   PANGO_STRETCH_ULTRA_CONDENSED,
 129   PANGO_STRETCH_EXTRA_CONDENSED,
 130   PANGO_STRETCH_CONDENSED,
 131   PANGO_STRETCH_SEMI_CONDENSED,
 132
 133   PANGO_STRETCH_SEMI_EXPANDED,
 134   PANGO_STRETCH_EXPANDED,
 135   PANGO_STRETCH_EXTRA_EXPANDED,
 136   PANGO_STRETCH_ULTRA_EXPANDED
 137   */
 138   return ps;
 139 }
 140
 141
 142
 143 PangoFontDescription*
 144 symbols_to_pango_font_description(SCM family,
 145                                   SCM style,
 146                                   SCM variant,
 147                                   SCM weight,
 148                                   SCM stretch)
 149 {
 150   PangoFontDescription * description = pango_font_description_new ();
 151
 152   String family_str = "roman";
 153   if (scm_is_symbol (family))
 154     family_str = ly_symbol2string (family);
 155   else if (scm_is_string (family))
 156     family_str = ly_scm2string (family);
 157
 158   pango_font_description_set_family (description,
 159                                      family_str.to_str0 ());
 160   pango_font_description_set_style (description,
 161                                     symbol_to_pango_style (style));
 162   pango_font_description_set_variant (description,
 163                                       symbol_to_pango_variant (variant));
 164   pango_font_description_set_weight (description,
 165                                      symbol_to_pango_weight (weight));
 166   pango_font_description_set_stretch (description,
 167                                       symbol_to_pango_stretch (stretch));
 168
 169   return description;
 170 }