src/adg/adg-pango-style.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007,2008,2009,2010,2011,2012,2013  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  * Since: 1.0
  28  */
  29
  30 /**
  31  * AdgPangoStyle:
  32  *
  33  * All fields are private and should not be used directly.
  34  * Use its public methods instead.
  35  *
  36  * Since: 1.0
  37  **/
  38
  39
  40 #include "adg-internal.h"
  41 #include <pango/pango.h>
  42
  43 #include "adg-style.h"
  44 #include "adg-dress.h"
  45 #include "adg-font-style.h"
  46
  47 #include "adg-pango-style.h"
  48 #include "adg-pango-style-private.h"
  49
  50
  51 #define _ADG_OLD_STYLE_CLASS  ((AdgStyleClass *) adg_pango_style_parent_class)
  52
  53
  54 G_DEFINE_TYPE(AdgPangoStyle, adg_pango_style, ADG_TYPE_FONT_STYLE)
  55
  56
  57 static void             _adg_invalidate         (AdgStyle       *style);
  58 static void             _adg_apply              (AdgStyle       *style,
  59                                                  AdgEntity      *entity,
  60                                                  cairo_t        *cr);
  61
  62
  63 static void
  64 adg_pango_style_class_init(AdgPangoStyleClass *klass)
  65 {
  66     AdgStyleClass *style_class;
  67
  68     style_class = (AdgStyleClass *) klass;
  69
  70     g_type_class_add_private(klass, sizeof(AdgPangoStylePrivate));
  71
  72     style_class->invalidate = _adg_invalidate;
  73     style_class->apply = _adg_apply;
  74 }
  75
  76 static void
  77 adg_pango_style_init(AdgPangoStyle *pango_style)
  78 {
  79     AdgPangoStylePrivate *data = G_TYPE_INSTANCE_GET_PRIVATE(pango_style,
  80                                                              ADG_TYPE_PANGO_STYLE,
  81                                                              AdgPangoStylePrivate);
  82
  83     data->font_description = NULL;
  84
  85     pango_style->data = data;
  86 }
  87
  88
  89 /**
  90  * adg_pango_style_new:
  91  *
  92  * Constructs a new pango style initialized with default params.
  93  *
  94  * Returns: a newly created pango style
  95  *
  96  * Since: 1.0
  97  **/
  98 AdgPangoStyle *
  99 adg_pango_style_new(void)
 100 {
 101     return g_object_new(ADG_TYPE_PANGO_STYLE, NULL);
 102 }
 103
 104 /**
 105  * adg_pango_style_get_description:
 106  * @pango_style: an #AdgPangoStyle object
 107  *
 108  * Gets the #PangoFontDescription of @pango_style. The returned font is
 109  * owned by @pango_style and must not be destroyed by the caller.
 110  *
 111  * Returns: the font description
 112  *
 113  * Since: 1.0
 114  **/
 115 PangoFontDescription *
 116 adg_pango_style_get_description(AdgPangoStyle *pango_style)
 117 {
 118     AdgPangoStylePrivate *data;
 119
 120     g_return_val_if_fail(ADG_IS_PANGO_STYLE(pango_style), NULL);
 121
 122     data = pango_style->data;
 123
 124     if (data->font_description == NULL) {
 125         AdgFontStyle *font_style;
 126         const gchar *family;
 127         cairo_font_slant_t slant;
 128         cairo_font_weight_t weight;
 129         gdouble size;
 130
 131         font_style = (AdgFontStyle *) pango_style;
 132         family = adg_font_style_get_family(font_style);
 133         slant = adg_font_style_get_slant(font_style);
 134         weight = adg_font_style_get_weight(font_style);
 135         size = adg_font_style_get_size(font_style);
 136
 137         data->font_description = pango_font_description_new();
 138
 139         pango_font_description_set_family(data->font_description, family);
 140
 141         switch (slant) {
 142         case CAIRO_FONT_SLANT_NORMAL:
 143             pango_font_description_set_style(data->font_description,
 144                                              PANGO_STYLE_NORMAL);
 145             break;
 146         case CAIRO_FONT_SLANT_ITALIC:
 147             pango_font_description_set_style(data->font_description,
 148                                              PANGO_STYLE_ITALIC);
 149             break;
 150         case CAIRO_FONT_SLANT_OBLIQUE:
 151             pango_font_description_set_style(data->font_description,
 152                                              PANGO_STYLE_OBLIQUE);
 153             break;
 154         default:
 155             g_warning(_("Unhandled slant value (%d)"), slant);
 156         }
 157
 158         switch (weight) {
 159         case CAIRO_FONT_WEIGHT_NORMAL:
 160             pango_font_description_set_weight(data->font_description,
 161                                               PANGO_WEIGHT_NORMAL);
 162             break;
 163         case CAIRO_FONT_WEIGHT_BOLD:
 164             pango_font_description_set_weight(data->font_description,
 165                                               PANGO_WEIGHT_BOLD);
 166             break;
 167         default:
 168             g_warning(_("Unhandled weight value (%d)"), weight);
 169         }
 170
 171         pango_font_description_set_size(data->font_description,
 172                                         size * PANGO_SCALE);
 173     }
 174
 175     return data->font_description;
 176 }
 177
 178
 179 static void
 180 _adg_invalidate(AdgStyle *style)
 181 {
 182     AdgPangoStyle *pango_style;
 183     AdgPangoStylePrivate *data;
 184
 185     pango_style = (AdgPangoStyle *) style;
 186     data = pango_style->data;
 187
 188     if (data->font_description != NULL) {
 189         pango_font_description_free(data->font_description);
 190         data->font_description = NULL;
 191     }
 192
 193     if (_ADG_OLD_STYLE_CLASS->invalidate != NULL)
 194         _ADG_OLD_STYLE_CLASS->invalidate(style);
 195 }
 196
 197 static void
 198 _adg_apply(AdgStyle *style, AdgEntity *entity, cairo_t *cr)
 199 {
 200     AdgFontStyle *font_style;
 201     AdgDress color_dress;
 202
 203     font_style = (AdgFontStyle *) style;
 204     color_dress = adg_font_style_get_color_dress(font_style);
 205
 206     adg_entity_apply_dress(entity, color_dress, cr);
 207 }