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
  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
  47     * pow (2.0, step / 6.0) * point_constant;
  48
  49   pango_font_description_set_size (description,
  50                                    gint (size * PANGO_SCALE));
  51   return description;
  52 }
  53
  54 Font_metric *
  55 select_pango_font (Output_def *layout, SCM chain)
  56 {
  57   PangoFontDescription *pfd =properties_to_pango_description (chain,
  58                                    layout->get_dimension (ly_symbol2scm ("text-font-size")));
  59
  60   Font_metric * fm = all_fonts_global->find_pango_font (pfd);
  61
  62   return find_scaled_font (layout, fm, 1.0);
  63 }
  64
  65 PangoStyle
  66 symbol_to_pango_style (SCM style)
  67 {
  68   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  69   if (style == ly_symbol2scm ("italic"))
  70     {
  71       pstyle = PANGO_STYLE_NORMAL;
  72     }
  73   else if (style == ly_symbol2scm ("oblique")
  74            || style == ly_symbol2scm ("slanted")
  75            )
  76     {
  77       pstyle = PANGO_STYLE_OBLIQUE;
  78     }
  79
  80   return pstyle;
  81 }
  82
  83 PangoVariant
  84 symbol_to_pango_variant (SCM variant)
  85 {
  86   PangoVariant pvariant;
  87   if (variant == ly_symbol2scm ("caps"))
  88     {
  89       pvariant = PANGO_VARIANT_SMALL_CAPS;
  90     }
  91   return pvariant;
  92 }
  93
  94
  95 PangoWeight
  96 symbol_to_pango_weight (SCM weight)
  97 {
  98   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  99   if (weight == ly_symbol2scm ("bold"))
 100     {
 101       pw = PANGO_WEIGHT_BOLD;
 102     }
 103   if (weight == ly_symbol2scm ("heavy"))
 104     {
 105       pw = PANGO_WEIGHT_HEAVY;
 106     }
 107   if (weight == ly_symbol2scm ("ultrabold"))
 108     {
 109       pw = PANGO_WEIGHT_ULTRABOLD;
 110     }
 111   if (weight == ly_symbol2scm ("light"))
 112     {
 113       pw = PANGO_WEIGHT_LIGHT;
 114     }
 115   if (weight == ly_symbol2scm ("ultralight"))
 116     {
 117       pw = PANGO_WEIGHT_ULTRALIGHT;
 118     }
 119
 120   return pw;
 121 }
 122
 123 PangoStretch
 124 symbol_to_pango_stretch (SCM) //  stretch)
 125 {
 126   PangoStretch ps = PANGO_STRETCH_NORMAL;
 127
 128   /*
 129     // TODO
 130
 131   PANGO_STRETCH_ULTRA_CONDENSED,
 132   PANGO_STRETCH_EXTRA_CONDENSED,
 133   PANGO_STRETCH_CONDENSED,
 134   PANGO_STRETCH_SEMI_CONDENSED,
 135
 136   PANGO_STRETCH_SEMI_EXPANDED,
 137   PANGO_STRETCH_EXPANDED,
 138   PANGO_STRETCH_EXTRA_EXPANDED,
 139   PANGO_STRETCH_ULTRA_EXPANDED
 140   */
 141   return ps;
 142 }
 143
 144
 145
 146 PangoFontDescription*
 147 symbols_to_pango_font_description(SCM family,
 148                                   SCM style,
 149                                   SCM variant,
 150                                   SCM weight,
 151                                   SCM stretch)
 152 {
 153   PangoFontDescription * description = pango_font_description_new ();
 154
 155   String family_str = scm_is_symbol (family)
 156     ? ly_symbol2string (family)
 157     : String("roman");
 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 }