[gimp] app: add gimp_item_is_visible()

[Michael Natterer <mitch src gnome org>]

commit d995fefb7c729fd0c3eb995f665b16825e13bf8a
Author: Michael Natterer <mitch gimp org>
Date:   Fri Sep 23 23:43:42 2011 +0200

    app: add gimp_item_is_visible()
    
    which returns TRUE if an item is effectively visible (it is visible
    and all its parents are visible).

 app/core/gimpitem.c |   18 ++++++++++++++++++
 app/core/gimpitem.h |    1 +
 2 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/app/core/gimpitem.c b/app/core/gimpitem.c
index 92e5dbe..a7a142d 100644
--- a/app/core/gimpitem.c
+++ b/app/core/gimpitem.c
@@ -1963,6 +1963,24 @@ gimp_item_get_visible (const GimpItem *item)
   return GET_PRIVATE (item)->visible;
 }
 
+gboolean
+gimp_item_is_visible (const GimpItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
+
+  if (gimp_item_get_visible (item))
+    {
+      GimpItem *parent = gimp_item_get_parent (item);
+
+      if (parent)
+        return gimp_item_is_visible (parent);
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
 void
 gimp_item_set_linked (GimpItem *item,
                       gboolean  linked,
diff --git a/app/core/gimpitem.h b/app/core/gimpitem.h
index 7764b57..cc6f01b 100644
--- a/app/core/gimpitem.h
+++ b/app/core/gimpitem.h
@@ -291,6 +291,7 @@ void            gimp_item_set_visible        (GimpItem           *item,
                                               gboolean            visible,
                                               gboolean            push_undo);
 gboolean        gimp_item_get_visible        (const GimpItem     *item);
+gboolean        gimp_item_is_visible         (const GimpItem     *item);
 
 void            gimp_item_set_linked         (GimpItem           *item,
                                               gboolean            linked,