cssvalue: Add a cssvalue for images

gtk/gtkcssimagevalue.c

@@ -0,0 +1,81 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2011 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gtkcssimagevalueprivate.h"
+
+#include "gtkstylepropertyprivate.h"
+
+struct _GtkCssValue {
+  GTK_CSS_VALUE_BASE
+  GtkCssImage *image;
+};
+
+static void
+gtk_css_value_image_free (GtkCssValue *value)
+{
+  g_object_unref (value->image);
+  g_slice_free (GtkCssValue, value);
+}
+
+static gboolean
+gtk_css_value_image_equal (const GtkCssValue *value1,
+                           const GtkCssValue *value2)
+{
+  return value1->image == value2->image;
+}
+
+static void
+gtk_css_value_image_print (const GtkCssValue *value,
+                           GString           *string)
+{
+  if (value->image)
+    _gtk_css_image_print (value->image, string);
+  else
+    g_string_append (string, "none");
+}
+
+static const GtkCssValueClass GTK_CSS_VALUE_IMAGE = {
+  gtk_css_value_image_free,
+  gtk_css_value_image_equal,
+  gtk_css_value_image_print
+};
+
+GtkCssValue *
+_gtk_css_image_value_new (GtkCssImage *image)
+{
+  static GtkCssValue none_singleton = { &GTK_CSS_VALUE_IMAGE, 1, NULL };
+  GtkCssValue *value;
+
+  if (image == NULL)
+    return _gtk_css_value_ref (&none_singleton);
+
+  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_IMAGE);
+  value->image = image;
+
+  return value;
+}
+
+GtkCssImage *
+_gtk_css_image_value_get_image (const GtkCssValue *value)
+{
+  g_return_val_if_fail (value->class == &GTK_CSS_VALUE_IMAGE, NULL);
+
+  return value->image;
+}
+