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
  27       Real step = robust_scm2double (ly_symbol2scm ("font-size"), 0.0);
  28       Real size = layout->get_dimension (ly_symbol2scm ("text-font-size"))
  29         * pow (2.0, step / 6.0);
  30       pango_font_description_set_size (description,
  31                                        gint (size * PANGO_SCALE));
  32     }
  33   else
  34     {
  35       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  36                                        SCM_BOOL_F);
  37       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  38                                         SCM_BOOL_F);
  39
  40       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  41                                       SCM_BOOL_F);
  42       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  43                                        SCM_BOOL_F);
  44
  45       Real step = robust_scm2double (ly_symbol2scm ("font-size"), 0.0);
  46       Real size = layout->get_dimension (ly_symbol2scm ("text-font-size"))
  47         * pow (2.0, step / 6.0);
  48
  49       description
  50         = symbols_to_pango_font_description (family, style, variant, weight,
  51                                              SCM_BOOL_F,
  52                                              size);
  53     }
  54
  55   Font_metric * fm = all_fonts_global->find_pango_font (description);
  56
  57   return find_scaled_font (layout, fm, 1.0,
  58                            ly_symbol2scm ("latin1"),
  59                            ly_symbol2scm ("latin1"));
  60 }
  61
  62
  63 PangoStyle
  64 symbol_to_pango_style (SCM style)
  65 {
  66   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  67   if (style == ly_symbol2scm ("italic"))
  68     {
  69       pstyle = PANGO_STYLE_NORMAL;
  70     }
  71   else if (style == ly_symbol2scm ("oblique")
  72            || style == ly_symbol2scm ("slanted")
  73            )
  74     {
  75       pstyle = PANGO_STYLE_OBLIQUE;
  76     }
  77
  78   return pstyle;
  79 }
  80
  81 PangoVariant
  82 symbol_to_pango_variant (SCM variant)
  83 {
  84   PangoVariant pvariant;
  85   if (variant == ly_symbol2scm ("caps"))
  86     {
  87       pvariant = PANGO_VARIANT_SMALL_CAPS;
  88     }
  89   return pvariant;
  90 }
  91
  92
  93 PangoWeight
  94 symbol_to_pango_weight (SCM weight)
  95 {
  96   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  97   if (weight == ly_symbol2scm ("bold"))
  98     {
  99       pw = PANGO_WEIGHT_BOLD;
 100     }
 101   if (weight == ly_symbol2scm ("heavy"))
 102     {
 103       pw = PANGO_WEIGHT_HEAVY;
 104     }
 105   if (weight == ly_symbol2scm ("ultrabold"))
 106     {
 107       pw = PANGO_WEIGHT_ULTRABOLD;
 108     }
 109   if (weight == ly_symbol2scm ("light"))
 110     {
 111       pw = PANGO_WEIGHT_LIGHT;
 112     }
 113   if (weight == ly_symbol2scm ("ultralight"))
 114     {
 115       pw = PANGO_WEIGHT_ULTRALIGHT;
 116     }
 117
 118   return pw;
 119 }
 120
 121 PangoStretch
 122 symbol_to_pango_stretch (SCM) //  stretch)
 123 {
 124   PangoStretch ps = PANGO_STRETCH_NORMAL;
 125
 126   /*
 127     // TODO
 128
 129   PANGO_STRETCH_ULTRA_CONDENSED,
 130   PANGO_STRETCH_EXTRA_CONDENSED,
 131   PANGO_STRETCH_CONDENSED,
 132   PANGO_STRETCH_SEMI_CONDENSED,
 133
 134   PANGO_STRETCH_SEMI_EXPANDED,
 135   PANGO_STRETCH_EXPANDED,
 136   PANGO_STRETCH_EXTRA_EXPANDED,
 137   PANGO_STRETCH_ULTRA_EXPANDED
 138   */
 139   return ps;
 140 }
 141
 142
 143
 144 PangoFontDescription*
 145 symbols_to_pango_font_description(SCM family,
 146                                   SCM style,
 147                                   SCM variant,
 148                                   SCM weight,
 149                                   SCM stretch,
 150                                   Real size)
 151 {
 152   PangoFontDescription * description = pango_font_description_new ();
 153
 154   String family_str = scm_is_symbol (family)
 155     ? ly_symbol2string (family)
 156     : String("roman");
 157   pango_font_description_set_family (description,
 158                                      family_str.to_str0 ());
 159   pango_font_description_set_style (description,
 160                                     symbol_to_pango_style (style));
 161   pango_font_description_set_variant (description,
 162                                       symbol_to_pango_variant (variant));
 163   pango_font_description_set_weight (description,
 164                                      symbol_to_pango_weight (weight));
 165   pango_font_description_set_stretch (description,
 166                                       symbol_to_pango_stretch (stretch));
 167   pango_font_description_set_size (description,
 168                                    gint (size * PANGO_SCALE));
 169
 170   return description;
 171 }