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-dress-builtins.h"
  46 #include "adg-font-style.h"
  47
  48 #include "adg-pango-style.h"
  49 #include "adg-pango-style-private.h"
  50
  51
  52 #define _ADG_OLD_STYLE_CLASS  ((AdgStyleClass *) adg_pango_style_parent_class)
  53
  54
  55 G_DEFINE_TYPE(AdgPangoStyle, adg_pango_style, ADG_TYPE_FONT_STYLE)
  56
  57
  58 static void             _adg_invalidate         (AdgStyle       *style);
  59 static void             _adg_apply              (AdgStyle       *style,
  60                                                  AdgEntity      *entity,
  61                                                  cairo_t        *cr);
  62
  63
  64 static void
  65 adg_pango_style_class_init(AdgPangoStyleClass *klass)
  66 {
  67     AdgStyleClass *style_class;
  68
  69     style_class = (AdgStyleClass *) klass;
  70
  71     g_type_class_add_private(klass, sizeof(AdgPangoStylePrivate));
  72
  73     style_class->invalidate = _adg_invalidate;
  74     style_class->apply = _adg_apply;
  75 }
  76
  77 static void
  78 adg_pango_style_init(AdgPangoStyle *pango_style)
  79 {
  80     AdgPangoStylePrivate *data = G_TYPE_INSTANCE_GET_PRIVATE(pango_style,
  81                                                              ADG_TYPE_PANGO_STYLE,
  82                                                              AdgPangoStylePrivate);
  83
  84     data->font_description = NULL;
  85
  86     pango_style->data = data;
  87 }
  88
  89
  90 /**
  91  * adg_pango_style_new:
  92  *
  93  * Constructs a new pango style initialized with default params.
  94  *
  95  * Returns: a newly created pango style
  96  *
  97  * Since: 1.0
  98  **/
  99 AdgPangoStyle *
 100 adg_pango_style_new(void)
 101 {
 102     return g_object_new(ADG_TYPE_PANGO_STYLE, NULL);
 103 }
 104
 105 /**
 106  * adg_pango_style_get_description:
 107  * @pango_style: an #AdgPangoStyle object
 108  *
 109  * Gets the #PangoFontDescription of @pango_style. The returned font is
 110  * owned by @pango_style and must not be destroyed by the caller.
 111  *
 112  * Returns: the font description
 113  *
 114  * Since: 1.0
 115  **/
 116 PangoFontDescription *
 117 adg_pango_style_get_description(AdgPangoStyle *pango_style)
 118 {
 119     AdgPangoStylePrivate *data;
 120
 121     g_return_val_if_fail(ADG_IS_PANGO_STYLE(pango_style), NULL);
 122
 123     data = pango_style->data;
 124
 125     if (data->font_description == NULL) {
 126         AdgFontStyle *font_style;
 127         const gchar *family;
 128         cairo_font_slant_t slant;
 129         cairo_font_weight_t weight;
 130         gdouble size;
 131
 132         font_style = (AdgFontStyle *) pango_style;
 133         family = adg_font_style_get_family(font_style);
 134         slant = adg_font_style_get_slant(font_style);
 135         weight = adg_font_style_get_weight(font_style);
 136         size = adg_font_style_get_size(font_style);
 137
 138         data->font_description = pango_font_description_new();
 139
 140         pango_font_description_set_family(data->font_description, family);
 141
 142         switch (slant) {
 143         case CAIRO_FONT_SLANT_NORMAL:
 144             pango_font_description_set_style(data->font_description,
 145                                              PANGO_STYLE_NORMAL);
 146             break;
 147         case CAIRO_FONT_SLANT_ITALIC:
 148             pango_font_description_set_style(data->font_description,
 149                                              PANGO_STYLE_ITALIC);
 150             break;
 151         case CAIRO_FONT_SLANT_OBLIQUE:
 152             pango_font_description_set_style(data->font_description,
 153                                              PANGO_STYLE_OBLIQUE);
 154             break;
 155         default:
 156             g_warning(_("Unhandled slant value (%d)"), slant);
 157         }
 158
 159         switch (weight) {
 160         case CAIRO_FONT_WEIGHT_NORMAL:
 161             pango_font_description_set_weight(data->font_description,
 162                                               PANGO_WEIGHT_NORMAL);
 163             break;
 164         case CAIRO_FONT_WEIGHT_BOLD:
 165             pango_font_description_set_weight(data->font_description,
 166                                               PANGO_WEIGHT_BOLD);
 167             break;
 168         default:
 169             g_warning(_("Unhandled weight value (%d)"), weight);
 170         }
 171
 172         pango_font_description_set_size(data->font_description,
 173                                         size * PANGO_SCALE);
 174     }
 175
 176     return data->font_description;
 177 }
 178
 179
 180 static void
 181 _adg_invalidate(AdgStyle *style)
 182 {
 183     AdgPangoStyle *pango_style;
 184     AdgPangoStylePrivate *data;
 185
 186     pango_style = (AdgPangoStyle *) style;
 187     data = pango_style->data;
 188
 189     if (data->font_description != NULL) {
 190         pango_font_description_free(data->font_description);
 191         data->font_description = NULL;
 192     }
 193
 194     if (_ADG_OLD_STYLE_CLASS->invalidate != NULL)
 195         _ADG_OLD_STYLE_CLASS->invalidate(style);
 196 }
 197
 198 static void
 199 _adg_apply(AdgStyle *style, AdgEntity *entity, cairo_t *cr)
 200 {
 201     AdgFontStyle *font_style;
 202     AdgDress color_dress;
 203
 204     font_style = (AdgFontStyle *) style;
 205     color_dress = adg_font_style_get_color_dress(font_style);
 206
 207     adg_entity_apply_dress(entity, color_dress, cr);
 208 }