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 * 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   Font_metric * fm = all_fonts_global->find_pango_font (pfd);
  60
  61   return find_scaled_font (layout, fm, 1.0);
  62 }
  63
  64 PangoStyle
  65 symbol_to_pango_style (SCM style)
  66 {
  67   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  68   if (style == ly_symbol2scm ("italic"))
  69     {
  70       pstyle = PANGO_STYLE_NORMAL;
  71     }
  72   else if (style == ly_symbol2scm ("oblique")
  73            || style == ly_symbol2scm ("slanted")
  74            )
  75     {
  76       pstyle = PANGO_STYLE_OBLIQUE;
  77     }
  78
  79   return pstyle;
  80 }
  81
  82 PangoVariant
  83 symbol_to_pango_variant (SCM variant)
  84 {
  85   PangoVariant pvariant;
  86   if (variant == ly_symbol2scm ("caps"))
  87     {
  88       pvariant = PANGO_VARIANT_SMALL_CAPS;
  89     }
  90   return pvariant;
  91 }
  92
  93
  94 PangoWeight
  95 symbol_to_pango_weight (SCM weight)
  96 {
  97   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  98   if (weight == ly_symbol2scm ("bold"))
  99     {
 100       pw = PANGO_WEIGHT_BOLD;
 101     }
 102   if (weight == ly_symbol2scm ("heavy"))
 103     {
 104       pw = PANGO_WEIGHT_HEAVY;
 105     }
 106   if (weight == ly_symbol2scm ("ultrabold"))
 107     {
 108       pw = PANGO_WEIGHT_ULTRABOLD;
 109     }
 110   if (weight == ly_symbol2scm ("light"))
 111     {
 112       pw = PANGO_WEIGHT_LIGHT;
 113     }
 114   if (weight == ly_symbol2scm ("ultralight"))
 115     {
 116       pw = PANGO_WEIGHT_ULTRALIGHT;
 117     }
 118
 119   return pw;
 120 }
 121
 122 PangoStretch
 123 symbol_to_pango_stretch (SCM) //  stretch)
 124 {
 125   PangoStretch ps = PANGO_STRETCH_NORMAL;
 126
 127   /*
 128     // TODO
 129
 130   PANGO_STRETCH_ULTRA_CONDENSED,
 131   PANGO_STRETCH_EXTRA_CONDENSED,
 132   PANGO_STRETCH_CONDENSED,
 133   PANGO_STRETCH_SEMI_CONDENSED,
 134
 135   PANGO_STRETCH_SEMI_EXPANDED,
 136   PANGO_STRETCH_EXPANDED,
 137   PANGO_STRETCH_EXTRA_EXPANDED,
 138   PANGO_STRETCH_ULTRA_EXPANDED
 139   */
 140   return ps;
 141 }
 142
 143
 144
 145 PangoFontDescription*
 146 symbols_to_pango_font_description(SCM family,
 147                                   SCM style,
 148                                   SCM variant,
 149                                   SCM weight,
 150                                   SCM stretch)
 151 {
 152   PangoFontDescription * description = pango_font_description_new ();
 153
 154   String family_str = "roman";
 155   if (scm_is_symbol (family))
 156     family_str = ly_symbol2string (family);
 157   else if (scm_is_string (family))
 158     family_str = ly_scm2string (family);
 159
 160   pango_font_description_set_family (description,
 161                                      family_str.to_str0 ());
 162   pango_font_description_set_style (description,
 163                                     symbol_to_pango_style (style));
 164   pango_font_description_set_variant (description,
 165                                       symbol_to_pango_variant (variant));
 166   pango_font_description_set_weight (description,
 167                                      symbol_to_pango_weight (weight));
 168   pango_font_description_set_stretch (description,
 169                                       symbol_to_pango_stretch (stretch));
 170
 171   return description;
 172 }