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 <math.h>
   9
  10 #include "dimensions.hh"
  11 #include "all-font-metrics.hh"
  12 #include "output-def.hh"
  13 #include "pango-font.hh"
  14
  15 PangoFontDescription *
  16 properties_to_pango_description (SCM chain, Real text_size)
  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   else
  27     {
  28       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  29                                        SCM_BOOL_F);
  30       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  31                                         SCM_BOOL_F);
  32
  33       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  34                                       SCM_BOOL_F);
  35       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  36                                        SCM_BOOL_F);
  37
  38       description
  39         = symbols_to_pango_font_description (family, style, variant, weight,
  40                                              SCM_BOOL_F);
  41     }
  42
  43   Real step = robust_scm2double (ly_symbol2scm ("font-size"), 0.0);
  44   Real size = text_size * pow (2.0, step / 6.0);
  45
  46   pango_font_description_set_size (description,
  47                                    gint (size * PANGO_SCALE));
  48   return description;
  49 }
  50
  51 Font_metric *
  52 select_pango_font (Output_def *layout, SCM chain)
  53 {
  54   PangoFontDescription *pfd = properties_to_pango_description (chain,
  55                                                                point_constant * layout->get_dimension (ly_symbol2scm ("text-font-size")));
  56
  57   char *str = pango_font_description_to_string (pfd);
  58   SCM scm_str = scm_makfrom0str (str);
  59   g_free (str);
  60
  61   return find_pango_font (layout, scm_str, 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_ITALIC;
  71     }
  72   else if (style == ly_symbol2scm ("oblique")
  73            || style == ly_symbol2scm ("slanted"))
  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 = PANGO_VARIANT_NORMAL;
  85   if (variant == ly_symbol2scm ("caps"))
  86     {
  87       pvariant = PANGO_VARIANT_SMALL_CAPS;
  88     }
  89   return pvariant;
  90 }
  91
  92 PangoWeight
  93 symbol_to_pango_weight (SCM weight)
  94 {
  95   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  96   if (weight == ly_symbol2scm ("bold"))
  97     {
  98       pw = PANGO_WEIGHT_BOLD;
  99     }
 100   if (weight == ly_symbol2scm ("heavy"))
 101     {
 102       pw = PANGO_WEIGHT_HEAVY;
 103     }
 104   if (weight == ly_symbol2scm ("ultrabold"))
 105     {
 106       pw = PANGO_WEIGHT_ULTRABOLD;
 107     }
 108   if (weight == ly_symbol2scm ("light"))
 109     {
 110       pw = PANGO_WEIGHT_LIGHT;
 111     }
 112   if (weight == ly_symbol2scm ("ultralight"))
 113     {
 114       pw = PANGO_WEIGHT_ULTRALIGHT;
 115     }
 116
 117   return pw;
 118 }
 119
 120 PangoStretch
 121 symbol_to_pango_stretch (SCM) //  stretch)
 122 {
 123   PangoStretch ps = PANGO_STRETCH_NORMAL;
 124
 125   /*
 126   // TODO
 127
 128   PANGO_STRETCH_ULTRA_CONDENSED,
 129   PANGO_STRETCH_EXTRA_CONDENSED,
 130   PANGO_STRETCH_CONDENSED,
 131   PANGO_STRETCH_SEMI_CONDENSED,
 132
 133   PANGO_STRETCH_SEMI_EXPANDED,
 134   PANGO_STRETCH_EXPANDED,
 135   PANGO_STRETCH_EXTRA_EXPANDED,
 136   PANGO_STRETCH_ULTRA_EXPANDED
 137   */
 138   return ps;
 139 }
 140
 141 PangoFontDescription *
 142 symbols_to_pango_font_description (SCM family,
 143                                    SCM style,
 144                                    SCM variant,
 145                                    SCM weight,
 146                                    SCM stretch)
 147 {
 148   PangoFontDescription *description = pango_font_description_new ();
 149
 150   String family_str = "roman";
 151   if (scm_is_symbol (family))
 152     family_str = ly_symbol2string (family);
 153   else if (scm_is_string (family))
 154     family_str = ly_scm2string (family);
 155
 156   pango_font_description_set_family (description,
 157                                      family_str.to_str0 ());
 158   pango_font_description_set_style (description,
 159                                     symbol_to_pango_style (style));
 160   pango_font_description_set_variant (description,
 161                                       symbol_to_pango_variant (variant));
 162   pango_font_description_set_weight (description,
 163                                      symbol_to_pango_weight (weight));
 164   pango_font_description_set_stretch (description,
 165                                       symbol_to_pango_stretch (stretch));
 166
 167   return description;
 168 }