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_get (ly_symbol2scm ("font-name"), chain, SCM_BOOL_F);
  19
  20   PangoFontDescription *description = 0;
  21   if (scm_is_string (name))
  22     {
  23       String name_str = ly_scm2string (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     pstyle = PANGO_STYLE_ITALIC;
  73   else if (style == ly_symbol2scm ("oblique")
  74            || style == ly_symbol2scm ("slanted"))
  75     pstyle = PANGO_STYLE_OBLIQUE;
  76
  77   return pstyle;
  78 }
  79
  80 PangoVariant
  81 symbol_to_pango_variant (SCM variant)
  82 {
  83   PangoVariant pvariant = PANGO_VARIANT_NORMAL;
  84   if (variant == ly_symbol2scm ("caps"))
  85     pvariant = PANGO_VARIANT_SMALL_CAPS;
  86   return pvariant;
  87 }
  88
  89 PangoWeight
  90 symbol_to_pango_weight (SCM weight)
  91 {
  92   PangoWeight pw = PANGO_WEIGHT_NORMAL;
  93   if (weight == ly_symbol2scm ("bold"))
  94     pw = PANGO_WEIGHT_BOLD;
  95   if (weight == ly_symbol2scm ("heavy"))
  96     pw = PANGO_WEIGHT_HEAVY;
  97   if (weight == ly_symbol2scm ("ultrabold"))
  98     pw = PANGO_WEIGHT_ULTRABOLD;
  99   if (weight == ly_symbol2scm ("light"))
 100     pw = PANGO_WEIGHT_LIGHT;
 101   if (weight == ly_symbol2scm ("ultralight"))
 102     pw = PANGO_WEIGHT_ULTRALIGHT;
 103
 104   return pw;
 105 }
 106
 107 PangoStretch
 108 symbol_to_pango_stretch (SCM) //  stretch)
 109 {
 110   PangoStretch ps = PANGO_STRETCH_NORMAL;
 111
 112   /*
 113   // TODO
 114
 115   PANGO_STRETCH_ULTRA_CONDENSED,
 116   PANGO_STRETCH_EXTRA_CONDENSED,
 117   PANGO_STRETCH_CONDENSED,
 118   PANGO_STRETCH_SEMI_CONDENSED,
 119
 120   PANGO_STRETCH_SEMI_EXPANDED,
 121   PANGO_STRETCH_EXPANDED,
 122   PANGO_STRETCH_EXTRA_EXPANDED,
 123   PANGO_STRETCH_ULTRA_EXPANDED
 124   */
 125   return ps;
 126 }
 127
 128 PangoFontDescription *
 129 symbols_to_pango_font_description (SCM family,
 130                                    SCM style,
 131                                    SCM variant,
 132                                    SCM weight,
 133                                    SCM stretch)
 134 {
 135   PangoFontDescription *description = pango_font_description_new ();
 136
 137   String family_str = "roman";
 138   if (scm_is_symbol (family))
 139     family_str = ly_symbol2string (family);
 140   else if (scm_is_string (family))
 141     family_str = ly_scm2string (family);
 142
 143   pango_font_description_set_family (description,
 144                                      family_str.to_str0 ());
 145   pango_font_description_set_style (description,
 146                                     symbol_to_pango_style (style));
 147   pango_font_description_set_variant (description,
 148                                       symbol_to_pango_variant (variant));
 149   pango_font_description_set_weight (description,
 150                                      symbol_to_pango_weight (weight));
 151   pango_font_description_set_stretch (description,
 152                                       symbol_to_pango_stretch (stretch));
 153
 154   return description;
 155 }