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--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8 #include <cmath>
   9 using namespace std;
  10
  11 #include "dimensions.hh"
  12 #include "all-font-metrics.hh"
  13 #include "output-def.hh"
  14 #include "pango-font.hh"
  15
  16 PangoFontDescription *
  17 properties_to_pango_description (SCM chain, Real text_size)
  18 {
  19   SCM name = ly_chain_assoc_get (ly_symbol2scm ("font-name"), chain, SCM_BOOL_F);
  20
  21   PangoFontDescription *description = 0;
  22   if (scm_is_string (name))
  23     {
  24       String name_str = ly_scm2string (name);
  25       description = pango_font_description_from_string (name_str.to_str0 ());
  26     }
  27   else
  28     {
  29       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  30                                        SCM_BOOL_F);
  31       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  32                                         SCM_BOOL_F);
  33
  34       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  35                                       SCM_BOOL_F);
  36       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  37                                        SCM_BOOL_F);
  38
  39       description
  40         = symbols_to_pango_font_description (family, style, variant, weight,
  41                                              SCM_BOOL_F);
  42     }
  43
  44   Real step = robust_scm2double (ly_chain_assoc_get (ly_symbol2scm ("font-size"), chain, SCM_BOOL_F),
  45                                  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
  57     = properties_to_pango_description (chain,
  58                                        point_constant
  59                                        * layout->get_dimension (ly_symbol2scm ("text-font-size")));
  60
  61   char *str = pango_font_description_to_string (pfd);
  62   SCM scm_str = scm_makfrom0str (str);
  63   g_free (str);
  64
  65   return find_pango_font (layout, scm_str, 1.0);
  66 }
  67
  68 PangoStyle
  69 symbol_to_pango_style (SCM style)
  70 {
  71   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  72   if (style == ly_symbol2scm ("italic"))
  73     pstyle = PANGO_STYLE_ITALIC;
  74   else if (style == ly_symbol2scm ("oblique")
  75            || style == ly_symbol2scm ("slanted"))
  76     pstyle = PANGO_STYLE_OBLIQUE;
  77
  78   return pstyle;
  79 }
  80
  81 PangoVariant
  82 symbol_to_pango_variant (SCM variant)
  83 {
  84   PangoVariant pvariant = PANGO_VARIANT_NORMAL;
  85   if (variant == ly_symbol2scm ("caps"))
  86     pvariant = PANGO_VARIANT_SMALL_CAPS;
  87   return pvariant;
  88 }
  89
  90 PangoWeight
  91 symbol_to_pango_weight (SCM weight)
  92 {
  93   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  94   if (weight == ly_symbol2scm ("bold"))
  95     pw = PANGO_WEIGHT_BOLD;
  96   if (weight == ly_symbol2scm ("heavy"))
  97     pw = PANGO_WEIGHT_HEAVY;
  98   if (weight == ly_symbol2scm ("ultrabold"))
  99     pw = PANGO_WEIGHT_ULTRABOLD;
 100   if (weight == ly_symbol2scm ("light"))
 101     pw = PANGO_WEIGHT_LIGHT;
 102   if (weight == ly_symbol2scm ("ultralight"))
 103     pw = PANGO_WEIGHT_ULTRALIGHT;
 104
 105   return pw;
 106 }
 107
 108 PangoStretch
 109 symbol_to_pango_stretch (SCM) //  stretch)
 110 {
 111   PangoStretch ps = PANGO_STRETCH_NORMAL;
 112
 113   /*
 114   // TODO
 115
 116   PANGO_STRETCH_ULTRA_CONDENSED,
 117   PANGO_STRETCH_EXTRA_CONDENSED,
 118   PANGO_STRETCH_CONDENSED,
 119   PANGO_STRETCH_SEMI_CONDENSED,
 120
 121   PANGO_STRETCH_SEMI_EXPANDED,
 122   PANGO_STRETCH_EXPANDED,
 123   PANGO_STRETCH_EXTRA_EXPANDED,
 124   PANGO_STRETCH_ULTRA_EXPANDED
 125   */
 126   return ps;
 127 }
 128
 129 PangoFontDescription *
 130 symbols_to_pango_font_description (SCM family,
 131                                    SCM style,
 132                                    SCM variant,
 133                                    SCM weight,
 134                                    SCM stretch)
 135 {
 136   PangoFontDescription *description = pango_font_description_new ();
 137
 138   String family_str = "roman";
 139   if (scm_is_symbol (family))
 140     family_str = ly_symbol2string (family);
 141   else if (scm_is_string (family))
 142     family_str = ly_scm2string (family);
 143
 144   pango_font_description_set_family (description,
 145                                      family_str.to_str0 ());
 146   pango_font_description_set_style (description,
 147                                     symbol_to_pango_style (style));
 148   pango_font_description_set_variant (description,
 149                                       symbol_to_pango_variant (variant));
 150   pango_font_description_set_weight (description,
 151                                      symbol_to_pango_weight (weight));
 152   pango_font_description_set_stretch (description,
 153                                       symbol_to_pango_stretch (stretch));
 154
 155   return description;
 156 }