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--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "dimensions.hh"
  10 #include "all-font-metrics.hh"
  11 #include "output-def.hh"
  12 #include "pango-font.hh"
  13
  14 PangoFontDescription *
  15 properties_to_pango_description (SCM chain, Real text_size)
  16 {
  17   SCM name = ly_chain_assoc_get (ly_symbol2scm ("font-name"), chain, SCM_BOOL_F);
  18
  19   PangoFontDescription *description = 0;
  20   if (scm_is_string (name))
  21     {
  22       string name_str = ly_scm2string (name);
  23       description = pango_font_description_from_string (name_str.c_str ());
  24     }
  25   else
  26     {
  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);
  31
  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);
  36
  37       description
  38         = symbols_to_pango_font_description (family, style, variant, weight,
  39                                              SCM_BOOL_F);
  40     }
  41
  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);
  45
  46   pango_font_description_set_size (description, gint (size * PANGO_SCALE));
  47   return description;
  48 }
  49
  50 Font_metric *
  51 select_pango_font (Output_def *layout, SCM chain)
  52 {
  53   PangoFontDescription *pfd
  54     = properties_to_pango_description (chain,
  55                                        point_constant
  56                                        * layout->get_dimension (ly_symbol2scm ("text-font-size")));
  57
  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);
  62
  63   return find_pango_font (layout, scm_str, 1.0);
  64 }
  65
  66 PangoStyle
  67 symbol_to_pango_style (SCM style)
  68 {
  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;
  75
  76   return pstyle;
  77 }
  78
  79 PangoVariant
  80 symbol_to_pango_variant (SCM variant)
  81 {
  82   PangoVariant pvariant = PANGO_VARIANT_NORMAL;
  83   if (variant == ly_symbol2scm ("caps"))
  84     pvariant = PANGO_VARIANT_SMALL_CAPS;
  85   return pvariant;
  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     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;
 102
 103   return pw;
 104 }
 105
 106 PangoStretch
 107 symbol_to_pango_stretch (SCM) //  stretch)
 108 {
 109   PangoStretch ps = PANGO_STRETCH_NORMAL;
 110
 111   /*
 112   // TODO
 113
 114   PANGO_STRETCH_ULTRA_CONDENSED,
 115   PANGO_STRETCH_EXTRA_CONDENSED,
 116   PANGO_STRETCH_CONDENSED,
 117   PANGO_STRETCH_SEMI_CONDENSED,
 118
 119   PANGO_STRETCH_SEMI_EXPANDED,
 120   PANGO_STRETCH_EXPANDED,
 121   PANGO_STRETCH_EXTRA_EXPANDED,
 122   PANGO_STRETCH_ULTRA_EXPANDED
 123   */
 124   return ps;
 125 }
 126
 127 PangoFontDescription *
 128 symbols_to_pango_font_description (SCM family,
 129                                    SCM style,
 130                                    SCM variant,
 131                                    SCM weight,
 132                                    SCM stretch)
 133 {
 134   PangoFontDescription *description = pango_font_description_new ();
 135
 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);
 141
 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));
 152
 153   return description;
 154 }