Pileus Git - ~andy/gtk/blob - gtk/gtkcssimageurl.c

   1 /*
   2  * Copyright © 2011 Red Hat Inc.
   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 2.1 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, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Authors: Benjamin Otte <otte@gnome.org>
  18  */
  19
  20 #include "config.h"
  21
  22 #include <string.h>
  23
  24 #include "gtkcssimageurlprivate.h"
  25 #include "gtkcssimagesurfaceprivate.h"
  26
  27 G_DEFINE_TYPE (GtkCssImageUrl, _gtk_css_image_url, GTK_TYPE_CSS_IMAGE)
  28
  29 static GtkCssImage *
  30 gtk_css_image_url_load_image (GtkCssImageUrl *url)
  31 {
  32   GdkPixbuf *pixbuf;
  33   GError *error = NULL;
  34   GFileInputStream *input;
  35
  36   if (url->loaded_image)
  37     return url->loaded_image;
  38
  39   /* We special case resources here so we can use
  40      gdk_pixbuf_new_from_resource, which in turn has some special casing
  41      for GdkPixdata files to avoid duplicating the memory for the pixbufs */
  42   if (g_file_has_uri_scheme (url->file, "resource"))
  43     {
  44       char *uri = g_file_get_uri (url->file);
  45       char *resource_path = g_uri_unescape_string (uri + strlen ("resource://"), NULL);
  46
  47       pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
  48       g_free (resource_path);
  49       g_free (uri);
  50     }
  51   else
  52     {
  53       input = g_file_read (url->file, NULL, &error);
  54       if (input != NULL)
  55         {
  56           pixbuf = gdk_pixbuf_new_from_stream (G_INPUT_STREAM (input), NULL, &error);
  57           g_object_unref (input);
  58         }
  59       else
  60         {
  61           pixbuf = NULL;
  62         }
  63     }
  64
  65   if (pixbuf == NULL)
  66     {
  67       cairo_surface_t *empty = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 0, 0);
  68
  69       /* XXX: Can we get the error somehow sent to the CssProvider?
  70        * I don't like just dumping it to stderr or losing it completely. */
  71       g_warning ("Error loading image: %s", error->message);
  72       g_error_free (error);
  73       url->loaded_image = _gtk_css_image_surface_new (empty);
  74       cairo_surface_destroy (empty);
  75       return url->loaded_image;
  76     }
  77
  78   url->loaded_image = _gtk_css_image_surface_new_for_pixbuf (pixbuf);
  79   g_object_unref (pixbuf);
  80
  81   return url->loaded_image;
  82 }
  83
  84 static int
  85 gtk_css_image_url_get_width (GtkCssImage *image)
  86 {
  87   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  88
  89   return _gtk_css_image_get_width (gtk_css_image_url_load_image (url));
  90 }
  91
  92 static int
  93 gtk_css_image_url_get_height (GtkCssImage *image)
  94 {
  95   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  96
  97   return _gtk_css_image_get_height (gtk_css_image_url_load_image (url));
  98 }
  99
 100 static double
 101 gtk_css_image_url_get_aspect_ratio (GtkCssImage *image)
 102 {
 103   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 104
 105   return _gtk_css_image_get_aspect_ratio (gtk_css_image_url_load_image (url));
 106 }
 107
 108 static void
 109 gtk_css_image_url_draw (GtkCssImage        *image,
 110                         cairo_t            *cr,
 111                         double              width,
 112                         double              height)
 113 {
 114   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 115
 116   _gtk_css_image_draw (gtk_css_image_url_load_image (url), cr, width, height);
 117 }
 118
 119 static GtkCssImage *
 120 gtk_css_image_url_compute (GtkCssImage             *image,
 121                            guint                    property_id,
 122                            GtkStyleProviderPrivate *provider,
 123                            GtkCssComputedValues    *values,
 124                            GtkCssComputedValues    *parent_values,
 125                            GtkCssDependencies      *dependencies)
 126 {
 127   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 128
 129   return g_object_ref (gtk_css_image_url_load_image (url));
 130 }
 131
 132 static gboolean
 133 gtk_css_image_url_parse (GtkCssImage  *image,
 134                          GtkCssParser *parser)
 135 {
 136   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 137
 138   url->file = _gtk_css_parser_read_url (parser);
 139   if (url->file == NULL)
 140     return FALSE;
 141
 142   return TRUE;
 143 }
 144
 145 static void
 146 gtk_css_image_url_print (GtkCssImage *image,
 147                          GString     *string)
 148 {
 149   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 150
 151   _gtk_css_image_print (gtk_css_image_url_load_image (url), string);
 152 }
 153
 154 static void
 155 gtk_css_image_url_dispose (GObject *object)
 156 {
 157   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (object);
 158
 159   g_clear_object (&url->file);
 160   g_clear_object (&url->loaded_image);
 161
 162   G_OBJECT_CLASS (_gtk_css_image_url_parent_class)->dispose (object);
 163 }
 164
 165 static void
 166 _gtk_css_image_url_class_init (GtkCssImageUrlClass *klass)
 167 {
 168   GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
 169   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 170
 171   image_class->get_width = gtk_css_image_url_get_width;
 172   image_class->get_height = gtk_css_image_url_get_height;
 173   image_class->get_aspect_ratio = gtk_css_image_url_get_aspect_ratio;
 174   image_class->compute = gtk_css_image_url_compute;
 175   image_class->draw = gtk_css_image_url_draw;
 176   image_class->parse = gtk_css_image_url_parse;
 177   image_class->print = gtk_css_image_url_print;
 178
 179   object_class->dispose = gtk_css_image_url_dispose;
 180 }
 181
 182 static void
 183 _gtk_css_image_url_init (GtkCssImageUrl *image_url)
 184 {
 185 }
 186