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_chain_assoc_get (ly_symbol2scm ("font-size"), chain, SCM_BOOL_F),
  44                                  0.0);
  45   Real size = text_size * pow (2.0, step / 6.0);
  46
  47   pango_font_description_set_size (description,
  48                                    gint (size * PANGO_SCALE));
  49   return description;
  50 }
  51
  52 Font_metric *
  53 select_pango_font (Output_def *layout, SCM chain)
  54 {
  55   PangoFontDescription *pfd
  56     = properties_to_pango_description (chain,
  57                                        point_constant
  58                                        * layout->get_dimension (ly_symbol2scm ("text-font-size")));
  59
  60   char *str = pango_font_description_to_string (pfd);
  61   SCM scm_str = scm_makfrom0str (str);
  62   g_free (str);
  63
  64   return find_pango_font (layout, scm_str, 1.0);
  65 }
  66
  67 PangoStyle
  68 symbol_to_pango_style (SCM style)
  69 {
  70   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  71   if (style == ly_symbol2scm ("italic"))
  72     {
  73       pstyle = PANGO_STYLE_ITALIC;
  74     }
  75   else if (style == ly_symbol2scm ("oblique")
  76            || style == ly_symbol2scm ("slanted"))
  77     {
  78       pstyle = PANGO_STYLE_OBLIQUE;
  79     }
  80
  81   return pstyle;
  82 }
  83
  84 PangoVariant
  85 symbol_to_pango_variant (SCM variant)
  86 {
  87   PangoVariant pvariant = PANGO_VARIANT_NORMAL;
  88   if (variant == ly_symbol2scm ("caps"))
  89     {
  90       pvariant = PANGO_VARIANT_SMALL_CAPS;
  91     }
  92   return pvariant;
  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 PangoFontDescription *
 145 symbols_to_pango_font_description (SCM family,
 146                                    SCM style,
 147                                    SCM variant,
 148                                    SCM weight,
 149                                    SCM stretch)
 150 {
 151   PangoFontDescription *description = pango_font_description_new ();
 152
 153   String family_str = "roman";
 154   if (scm_is_symbol (family))
 155     family_str = ly_symbol2string (family);
 156   else if (scm_is_string (family))
 157     family_str = ly_scm2string (family);
 158
 159   pango_font_description_set_family (description,
 160                                      family_str.to_str0 ());
 161   pango_font_description_set_style (description,
 162                                     symbol_to_pango_style (style));
 163   pango_font_description_set_variant (description,
 164                                       symbol_to_pango_variant (variant));
 165   pango_font_description_set_weight (description,
 166                                      symbol_to_pango_weight (weight));
 167   pango_font_description_set_stretch (description,
 168                                       symbol_to_pango_stretch (stretch));
 169
 170   return description;
 171 }