lily/pango-select.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "dimensions.hh"
  21 #include "all-font-metrics.hh"
  22 #include "libc-extension.hh"
  23 #include "output-def.hh"
  24 #include "pango-font.hh"
  25
  26 using std::string;
  27
  28 PangoFontDescription *
  29 properties_to_pango_description (SCM chain, Real text_size)
  30 {
  31   SCM name = ly_chain_assoc_get (ly_symbol2scm ("font-name"), chain, SCM_BOOL_F);
  32
  33   PangoFontDescription *description = 0;
  34   if (scm_is_string (name))
  35     {
  36       string name_str = ly_scm2string (name);
  37       description = pango_font_description_from_string (name_str.c_str ());
  38     }
  39   else
  40     {
  41       SCM family = ly_chain_assoc_get (ly_symbol2scm ("font-family"), chain,
  42                                        SCM_BOOL_F);
  43       SCM variant = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  44                                         SCM_BOOL_F);
  45
  46       SCM style = ly_chain_assoc_get (ly_symbol2scm ("font-shape"), chain,
  47                                       SCM_BOOL_F);
  48       SCM weight = ly_chain_assoc_get (ly_symbol2scm ("font-series"), chain,
  49                                        SCM_BOOL_F);
  50
  51       description
  52         = symbols_to_pango_font_description (family, style, variant, weight,
  53                                              SCM_BOOL_F);
  54     }
  55
  56   Real step = robust_scm2double (ly_chain_assoc_get (ly_symbol2scm ("font-size"), chain, SCM_BOOL_F),
  57                                  0.0);
  58   Real size = text_size * pow (2.0, step / 6.0);
  59
  60   pango_font_description_set_size (description,
  61                                    gint (my_round (size * PANGO_SCALE)));
  62   return description;
  63 }
  64
  65 Font_metric *
  66 select_pango_font (Output_def *layout, SCM chain)
  67 {
  68   PangoFontDescription *pfd
  69     = properties_to_pango_description (chain,
  70                                        point_constant
  71                                        * layout->get_dimension (ly_symbol2scm ("text-font-size")));
  72
  73   char *str = pango_font_description_to_string (pfd);
  74   SCM scm_str = scm_from_locale_string (str);
  75   g_free (str);
  76   pango_font_description_free (pfd);
  77
  78   return find_pango_font (layout, scm_str, 1.0);
  79 }
  80
  81 PangoStyle
  82 symbol_to_pango_style (SCM style)
  83 {
  84   PangoStyle pstyle = PANGO_STYLE_NORMAL;
  85   if (scm_is_eq (style, ly_symbol2scm ("italic")))
  86     pstyle = PANGO_STYLE_ITALIC;
  87   else if (scm_is_eq (style, ly_symbol2scm ("oblique"))
  88            || scm_is_eq (style, ly_symbol2scm ("slanted")))
  89     pstyle = PANGO_STYLE_OBLIQUE;
  90
  91   return pstyle;
  92 }
  93
  94 PangoVariant
  95 symbol_to_pango_variant (SCM variant)
  96 {
  97   PangoVariant pvariant = PANGO_VARIANT_NORMAL;
  98   if (scm_is_eq (variant, ly_symbol2scm ("caps")))
  99     pvariant = PANGO_VARIANT_SMALL_CAPS;
 100   return pvariant;
 101 }
 102
 103 PangoWeight
 104 symbol_to_pango_weight (SCM weight)
 105 {
 106   PangoWeight pw = PANGO_WEIGHT_NORMAL;
 107   if (scm_is_eq (weight, ly_symbol2scm ("bold")))
 108     pw = PANGO_WEIGHT_BOLD;
 109   if (scm_is_eq (weight, ly_symbol2scm ("heavy")))
 110     pw = PANGO_WEIGHT_HEAVY;
 111   if (scm_is_eq (weight, ly_symbol2scm ("ultrabold")))
 112     pw = PANGO_WEIGHT_ULTRABOLD;
 113   if (scm_is_eq (weight, ly_symbol2scm ("light")))
 114     pw = PANGO_WEIGHT_LIGHT;
 115   if (scm_is_eq (weight, ly_symbol2scm ("ultralight")))
 116     pw = PANGO_WEIGHT_ULTRALIGHT;
 117
 118   return pw;
 119 }
 120
 121 PangoStretch
 122 symbol_to_pango_stretch (SCM) //  stretch)
 123 {
 124   PangoStretch ps = PANGO_STRETCH_NORMAL;
 125
 126   /*
 127   // TODO
 128
 129   PANGO_STRETCH_ULTRA_CONDENSED,
 130   PANGO_STRETCH_EXTRA_CONDENSED,
 131   PANGO_STRETCH_CONDENSED,
 132   PANGO_STRETCH_SEMI_CONDENSED,
 133
 134   PANGO_STRETCH_SEMI_EXPANDED,
 135   PANGO_STRETCH_EXPANDED,
 136   PANGO_STRETCH_EXTRA_EXPANDED,
 137   PANGO_STRETCH_ULTRA_EXPANDED
 138   */
 139   return ps;
 140 }
 141
 142 PangoFontDescription *
 143 symbols_to_pango_font_description (SCM family,
 144                                    SCM style,
 145                                    SCM variant,
 146                                    SCM weight,
 147                                    SCM stretch)
 148 {
 149   PangoFontDescription *description = pango_font_description_new ();
 150
 151   string family_str = "roman";
 152   if (scm_is_symbol (family))
 153     family_str = ly_symbol2string (family);
 154   else if (scm_is_string (family))
 155     family_str = ly_scm2string (family);
 156
 157   pango_font_description_set_family (description,
 158                                      family_str.c_str ());
 159   pango_font_description_set_style (description,
 160                                     symbol_to_pango_style (style));
 161   pango_font_description_set_variant (description,
 162                                       symbol_to_pango_variant (variant));
 163   pango_font_description_set_weight (description,
 164                                      symbol_to_pango_weight (weight));
 165   pango_font_description_set_stretch (description,
 166                                       symbol_to_pango_stretch (stretch));
 167
 168   return description;
 169 }