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 "all-font-metrics.hh"
  12 #include "output-def.hh"
  13 #include "pango-font.hh"
  14
  15 Font_metric *
  16 select_pango_font (Output_def *layout, SCM chain)
  17 {
  18   SCM name = ly_chain_assoc (ly_symbol2scm ("font-name"), chain);
  19
  20   PangoFontDescription *description = 0;
  21   if (scm_is_pair (name) && scm_is_string (scm_cdr (name)))
  22     {
  23       String name_str = ly_scm2string (scm_cdr (name));
  24       description = pango_font_description_from_string (name_str.to_str0 ());
  25     }
  26   else
  27     {
  28       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  29                                        SCM_BOOL_F);
  30       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  31                                         SCM_BOOL_F);
  32
  33       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  34                                       SCM_BOOL_F);
  35       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  36                                        SCM_BOOL_F);
  37
  38       Real step = robust_scm2double (ly_symbol2scm ("font-size"), 0.0);
  39       Real size = layout->get_dimension (ly_symbol2scm ("text-font-size"))
  40         * pow (2.0, step / 6.0);
  41
  42       description
  43         = symbols_to_pango_font_description (family, style, variant, weight,
  44                                              SCM_BOOL_F,
  45                                              size);
  46     }
  47
  48   Font_metric * fm = all_fonts_global->find_pango_font (description);
  49
  50   /*
  51     Klutz the pango font into font table, otherwise it doesn't show up
  52     in the output.
  53    */
  54   SCM font_table = get_font_table (layout);
  55   SCM sizes = scm_hashq_ref (font_table, fm->self_scm (), SCM_BOOL_F);
  56   if (sizes != SCM_BOOL_F)
  57     {
  58       SCM met = scm_assoc (scm_make_real (1.0), sizes);
  59       if (scm_is_pair (met))
  60         return unsmob_metrics (scm_cdr (met));
  61     }
  62   else
  63     sizes = SCM_EOL;
  64
  65   sizes = scm_acons (scm_make_real (1.0), fm->self_scm(), sizes);
  66   scm_hashq_set_x (font_table, fm->self_scm (), sizes);
  67
  68   return fm;
  69 }
  70
  71
  72 PangoStyle
  73 symbol_to_pango_style (SCM style)
  74 {
  75   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  76   if (style == ly_symbol2scm ("italic"))
  77     {
  78       pstyle = PANGO_STYLE_NORMAL;
  79     }
  80   else if (style == ly_symbol2scm ("oblique")
  81            || style == ly_symbol2scm ("slanted")
  82            )
  83     {
  84       pstyle = PANGO_STYLE_OBLIQUE;
  85     }
  86
  87   return pstyle;
  88 }
  89
  90 PangoVariant
  91 symbol_to_pango_variant (SCM variant)
  92 {
  93   PangoVariant pvariant;
  94   if (variant == ly_symbol2scm ("caps"))
  95     {
  96       pvariant = PANGO_VARIANT_SMALL_CAPS;
  97     }
  98   return pvariant;
  99 }
 100
 101
 102 PangoWeight
 103 symbol_to_pango_weight (SCM weight)
 104 {
 105   PangoWeight pw = PANGO_WEIGHT_NORMAL;
 106   if (weight == ly_symbol2scm ("bold"))
 107     {
 108       pw = PANGO_WEIGHT_BOLD;
 109     }
 110   if (weight == ly_symbol2scm ("heavy"))
 111     {
 112       pw = PANGO_WEIGHT_HEAVY;
 113     }
 114   if (weight == ly_symbol2scm ("ultrabold"))
 115     {
 116       pw = PANGO_WEIGHT_ULTRABOLD;
 117     }
 118   if (weight == ly_symbol2scm ("light"))
 119     {
 120       pw = PANGO_WEIGHT_LIGHT;
 121     }
 122   if (weight == ly_symbol2scm ("ultralight"))
 123     {
 124       pw = PANGO_WEIGHT_ULTRALIGHT;
 125     }
 126
 127   return pw;
 128 }
 129
 130 PangoStretch
 131 symbol_to_pango_stretch (SCM) //  stretch)
 132 {
 133   PangoStretch ps = PANGO_STRETCH_NORMAL;
 134
 135   /*
 136     // TODO
 137
 138   PANGO_STRETCH_ULTRA_CONDENSED,
 139   PANGO_STRETCH_EXTRA_CONDENSED,
 140   PANGO_STRETCH_CONDENSED,
 141   PANGO_STRETCH_SEMI_CONDENSED,
 142
 143   PANGO_STRETCH_SEMI_EXPANDED,
 144   PANGO_STRETCH_EXPANDED,
 145   PANGO_STRETCH_EXTRA_EXPANDED,
 146   PANGO_STRETCH_ULTRA_EXPANDED
 147   */
 148   return ps;
 149 }
 150
 151
 152
 153 PangoFontDescription*
 154 symbols_to_pango_font_description(SCM family,
 155                                   SCM style,
 156                                   SCM variant,
 157                                   SCM weight,
 158                                   SCM stretch,
 159                                   Real size)
 160 {
 161   PangoFontDescription * description = pango_font_description_new ();
 162
 163   String family_str = scm_is_symbol (family)
 164     ? ly_symbol2string (family)
 165     : String("roman");
 166   pango_font_description_set_family (description,
 167                                      family_str.to_str0 ());
 168   pango_font_description_set_style (description,
 169                                     symbol_to_pango_style (style));
 170   pango_font_description_set_variant (description,
 171                                       symbol_to_pango_variant (variant));
 172   pango_font_description_set_weight (description,
 173                                      symbol_to_pango_weight (weight));
 174   pango_font_description_set_stretch (description,
 175                                       symbol_to_pango_stretch (stretch));
 176   pango_font_description_set_size (description,
 177                                    gint (size * PANGO_SCALE));
 178
 179   return description;
 180 }