libgimpwidgets: add gimp_screen_get_color_profile()

and use it in gimp_widget_get_color_profile(). Will soon be used in
screenshot too.

libgimpwidgets/gimpwidgets.def

@@ -357,6 +357,7 @@ EXPORTS
 	gimp_scale_entry_new
 	gimp_scale_entry_set_logarithmic
 	gimp_scale_entry_set_sensitive
+	gimp_screen_get_color_profile
 	gimp_scrolled_preview_freeze
 	gimp_scrolled_preview_get_type
 	gimp_scrolled_preview_set_policy

libgimpwidgets/gimpwidgetsutils.c

@@ -470,25 +470,27 @@ gimp_widget_track_monitor (GtkWidget *widget,
     track_monitor_hierarchy_changed (widget, NULL, track_data);
 }
 
+/**
+ * gimp_screen_get_color_profile:
+ * @screen:  a #GdkScreen
+ * @monitor: the monitor number
+ *
+ * This function returns the #GimpColorProfile of monitor number @monitor
+ * of @screen, or %NULL if there is no profile configured.
+ *
+ * Since: 2.10
+ *
+ * Return value: the monitor's #GimpColorProfile, or %NULL.
+ **/
 GimpColorProfile *
-gimp_widget_get_color_profile (GtkWidget *widget)
+gimp_screen_get_color_profile (GdkScreen *screen,
+                               gint       monitor)
 {
   GimpColorProfile *profile = NULL;
-  GdkScreen        *screen;
-  gint              monitor;
 
-  g_return_val_if_fail (widget == NULL || GTK_IS_WIDGET (widget), NULL);
-
-  if (widget)
-    {
-      screen  = gtk_widget_get_screen (widget);
-      monitor = gimp_widget_get_monitor (widget);
-    }
-  else
-    {
-      screen  = gdk_screen_get_default ();
-      monitor = 0;
-    }
+  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
+  g_return_val_if_fail (monitor >= 0, NULL);
+  g_return_val_if_fail (monitor < gdk_screen_get_n_monitors (screen), NULL);
 
 #if defined GDK_WINDOWING_X11
   {
@@ -579,6 +581,28 @@ gimp_widget_get_color_profile (GtkWidget *widget)
   return profile;
 }
 
+GimpColorProfile *
+gimp_widget_get_color_profile (GtkWidget *widget)
+{
+  GdkScreen *screen;
+  gint       monitor;
+
+  g_return_val_if_fail (widget == NULL || GTK_IS_WIDGET (widget), NULL);
+
+  if (widget)
+    {
+      screen  = gtk_widget_get_screen (widget);
+      monitor = gimp_widget_get_monitor (widget);
+    }
+  else
+    {
+      screen  = gdk_screen_get_default ();
+      monitor = 0;
+    }
+
+  return gimp_screen_get_color_profile (screen, monitor);
+}
+
 static GimpColorProfile *
 get_display_profile (GtkWidget       *widget,
                      GimpColorConfig *config)

libgimpwidgets/gimpwidgetsutils.h

@@ -50,6 +50,8 @@ void                 gimp_widget_track_monitor       (GtkWidget         *widget,
                                                       GCallback          monitor_changed_callback,
                                                       gpointer           user_data);
 
+GimpColorProfile   * gimp_screen_get_color_profile   (GdkScreen         *screen,
+                                                      gint               monitor);
 GimpColorProfile   * gimp_widget_get_color_profile   (GtkWidget         *widget);
 
 GimpColorTransform * gimp_widget_get_color_transform (GtkWidget         *widget,