4 files changed, 89 insertions, 1 deletions
diff --git a/e-util/e-binding.c b/e-util/e-binding.c
index 26e62c6a23..26e23ee792 100644
--- a/e-util/e-binding.c
+++ b/e-util/e-binding.c
@@ -480,3 +480,55 @@ e_mutual_binding_unbind (EMutualBinding *binding)
 	g_signal_handler_disconnect (
 		binding->reverse.dst_object, binding->direct.handler);
 }
+
+/**
+ * e_binding_transform_color_to_string:
+ * @src_value: a #GValue of type #GDK_TYPE_COLOR
+ * @dst_value: a #GValue of type #G_TYPE_STRING
+ * @user_data: not used
+ *
+ * Transforms a #GdkColor value to a color string specification.
+ *
+ * Returns: %TRUE always
+ **/
+gboolean
+e_binding_transform_color_to_string (const GValue *src_value,
+                                     GValue *dst_value,
+                                     gpointer user_data)
+{
+	const GdkColor *color;
+	gchar *string;
+
+	color = g_value_get_boxed (src_value);
+	string = gdk_color_to_string (color);
+	g_value_set_string (dst_value, string);
+	g_free (string);
+
+	return TRUE;
+}
+
+/**
+ * e_binding_transform_string_to_color:
+ * @src_value: a #GValue of type #G_TYPE_STRING
+ * @dst_value: a #GValue of type #GDK_TYPE_COLOR
+ * @user_data: not used
+ *
+ * Transforms a color string specification to a #GdkColor.
+ *
+ * Returns: %TRUE if color string specification was valid
+ **/
+gboolean
+e_binding_transform_string_to_color (const GValue *src_value,
+                                     GValue *dst_value,
+                                     gpointer user_data)
+{
+	GdkColor color;
+	const gchar *string;
+	gboolean success;
+
+	string = g_value_get_string (src_value);
+	if (gdk_color_parse (string, &color))
+		g_value_set_boxed (dst_value, &color);
+
+	return success;
+}
diff --git a/e-util/e-binding.h b/e-util/e-binding.h
index 2cced75920..676093bfad 100644
--- a/e-util/e-binding.h
+++ b/e-util/e-binding.h
@@ -26,7 +26,7 @@
 #ifndef E_BINDING_H
 #define E_BINDING_H
 
-#include <glib-object.h>
+#include <gdk/gdk.h>
 
 G_BEGIN_DECLS
 
@@ -102,6 +102,17 @@ EMutualBinding *e_mutual_binding_new_with_negation
 						 const gchar *property2);
 void		e_mutual_binding_unbind		(EMutualBinding *binding);
 
+
+/* Useful transformation functions */
+gboolean	e_binding_transform_color_to_string
+						(const GValue *src_value,
+						 GValue *dst_value,
+						 gpointer user_data);
+gboolean	e_binding_transform_string_to_color
+						(const GValue *src_value,
+						 GValue *dst_value,
+						 gpointer user_data);
+
 G_END_DECLS
 
 #endif /* E_BINDING_H */
diff --git a/e-util/e-util.c b/e-util/e-util.c
index a5e6c6b548..c65fcbceaf 100644
--- a/e-util/e-util.c
+++ b/e-util/e-util.c
@@ -432,6 +432,30 @@ e_write_file_uri (const gchar *filename, const gchar *data)
 	return res;
 }
 
+/**
+ * e_color_to_value:
+ * color: a #GdkColor
+ *
+ * Converts a #GdkColor to a 24-bit RGB color value.
+ *
+ * Returns: a 24-bit color value
+ **/
+guint32
+e_color_to_value (GdkColor *color)
+{
+	guint16 red;
+	guint16 green;
+	guint16 blue;
+
+	g_return_val_if_fail (color != NULL, 0);
+
+	red = color->red >> 8;
+	green = color->green >> 8;
+	blue = color->blue >> 8;
+
+	return (guint32) (((red << 16) | (green << 8) | blue) & 0xffffff);
+}
+
 static gint
 epow10 (gint number)
 {
diff --git a/e-util/e-util.h b/e-util/e-util.h
index 28d7a50a39..65e492850f 100644
--- a/e-util/e-util.h
+++ b/e-util/e-util.h
@@ -64,6 +64,7 @@ gint		e_int_compare                   (gconstpointer x,
 						 gconstpointer y);
 gboolean	e_write_file_uri		(const gchar *filename,
 						 const gchar *data);
+guint32		e_color_to_value		(GdkColor *color);
 
 /* This only makes a filename safe for usage as a filename.
  * It still may have shell meta-characters in it. */