src/adg/adg-pango-style.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007,2008,2009,2010,2011  Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20
  21 /**
  22  * SECTION:adg-pango-style
  23  * @short_description: A font style with pango support
  24  *
  25  * Adds pango support to the #AdgFontStyle class.
  26  */
  27
  28 /**
  29  * AdgPangoStyle:
  30  *
  31  * All fields are private and should not be used directly.
  32  * Use its public methods instead.
  33  **/
  34
  35
  36 #include "adg-internal.h"
  37 #include "adg-style.h"
  38 #include "adg-dress.h"
  39 #include "adg-dress-builtins.h"
  40 #include "adg-font-style.h"
  41
  42 #include "adg-pango-style.h"
  43 #include "adg-pango-style-private.h"
  44
  45
  46 #define _ADG_OLD_STYLE_CLASS  ((AdgStyleClass *) adg_pango_style_parent_class)
  47
  48
  49 G_DEFINE_TYPE(AdgPangoStyle, adg_pango_style, ADG_TYPE_FONT_STYLE)
  50
  51
  52 static void             _adg_invalidate         (AdgStyle       *style);
  53 static void             _adg_apply              (AdgStyle       *style,
  54                                                  AdgEntity      *entity,
  55                                                  cairo_t        *cr);
  56
  57
  58 static void
  59 adg_pango_style_class_init(AdgPangoStyleClass *klass)
  60 {
  61     AdgStyleClass *style_class;
  62
  63     style_class = (AdgStyleClass *) klass;
  64
  65     g_type_class_add_private(klass, sizeof(AdgPangoStylePrivate));
  66
  67     style_class->invalidate = _adg_invalidate;
  68     style_class->apply = _adg_apply;
  69 }
  70
  71 static void
  72 adg_pango_style_init(AdgPangoStyle *pango_style)
  73 {
  74     AdgPangoStylePrivate *data = G_TYPE_INSTANCE_GET_PRIVATE(pango_style,
  75                                                              ADG_TYPE_PANGO_STYLE,
  76                                                              AdgPangoStylePrivate);
  77
  78     data->font_description = NULL;
  79
  80     pango_style->data = data;
  81 }
  82
  83
  84 /**
  85  * adg_pango_style_new:
  86  *
  87  * Constructs a new pango style initialized with default params.
  88  *
  89  * Returns: a newly created pango style
  90  **/
  91 AdgPangoStyle *
  92 adg_pango_style_new(void)
  93 {
  94     return g_object_new(ADG_TYPE_PANGO_STYLE, NULL);
  95 }
  96
  97 /**
  98  * adg_pango_style_get_description:
  99  * @pango_style: an #AdgPangoStyle object
 100  *
 101  * Gets the #PangoFontDescription of @pango_style. The returned font is
 102  * owned by @pango_style and must not be destroyed by the caller.
 103  *
 104  * Returns: the font description
 105  **/
 106 PangoFontDescription *
 107 adg_pango_style_get_description(AdgPangoStyle *pango_style)
 108 {
 109     AdgPangoStylePrivate *data;
 110
 111     g_return_val_if_fail(ADG_IS_PANGO_STYLE(pango_style), NULL);
 112
 113     data = pango_style->data;
 114
 115     if (data->font_description == NULL) {
 116         AdgFontStyle *font_style;
 117         const gchar *family;
 118         cairo_font_slant_t slant;
 119         cairo_font_weight_t weight;
 120         gdouble size;
 121
 122         font_style = (AdgFontStyle *) pango_style;
 123         family = adg_font_style_get_family(font_style);
 124         slant = adg_font_style_get_slant(font_style);
 125         weight = adg_font_style_get_weight(font_style);
 126         size = adg_font_style_get_size(font_style);
 127
 128         data->font_description = pango_font_description_new();
 129
 130         pango_font_description_set_family(data->font_description, family);
 131
 132         switch (slant) {
 133         case CAIRO_FONT_SLANT_NORMAL:
 134             pango_font_description_set_style(data->font_description,
 135                                              PANGO_STYLE_NORMAL);
 136             break;
 137         case CAIRO_FONT_SLANT_ITALIC:
 138             pango_font_description_set_style(data->font_description,
 139                                              PANGO_STYLE_ITALIC);
 140             break;
 141         case CAIRO_FONT_SLANT_OBLIQUE:
 142             pango_font_description_set_style(data->font_description,
 143                                              PANGO_STYLE_OBLIQUE);
 144             break;
 145         default:
 146             g_warning(_("Unhandled slant value (%d)"), slant);
 147         }
 148
 149         switch (weight) {
 150         case CAIRO_FONT_WEIGHT_NORMAL:
 151             pango_font_description_set_weight(data->font_description,
 152                                               PANGO_WEIGHT_NORMAL);
 153             break;
 154         case CAIRO_FONT_WEIGHT_BOLD:
 155             pango_font_description_set_weight(data->font_description,
 156                                               PANGO_WEIGHT_BOLD);
 157             break;
 158         default:
 159             g_warning(_("Unhandled weight value (%d)"), weight);
 160         }
 161
 162         pango_font_description_set_size(data->font_description,
 163                                         size * PANGO_SCALE);
 164     }
 165
 166     return data->font_description;
 167 }
 168
 169
 170 static void
 171 _adg_invalidate(AdgStyle *style)
 172 {
 173     AdgPangoStyle *pango_style;
 174     AdgPangoStylePrivate *data;
 175
 176     pango_style = (AdgPangoStyle *) style;
 177     data = pango_style->data;
 178
 179     if (data->font_description != NULL) {
 180         pango_font_description_free(data->font_description);
 181         data->font_description = NULL;
 182     }
 183
 184     if (_ADG_OLD_STYLE_CLASS->invalidate != NULL)
 185         _ADG_OLD_STYLE_CLASS->invalidate(style);
 186 }
 187
 188 static void
 189 _adg_apply(AdgStyle *style, AdgEntity *entity, cairo_t *cr)
 190 {
 191     AdgFontStyle *font_style;
 192     AdgDress color_dress;
 193
 194     font_style = (AdgFontStyle *) style;
 195     color_dress = adg_font_style_get_color_dress(font_style);
 196
 197     adg_entity_apply_dress(entity, color_dress, cr);
 198 }