[gegl] process: Call prepare for meta-ops

[Debarshi Ray <debarshir src gnome org>]

commit 21f3b8c8d11152369b01c6c7c04de073244cb0ad
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Jan 14 16:24:15 2016 +0100

    process: Call prepare for meta-ops
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760628

 gegl/process/gegl-graph-traversal.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gegl/process/gegl-graph-traversal.c b/gegl/process/gegl-graph-traversal.c
index bd481d1..7af3071 100644
--- a/gegl/process/gegl-graph-traversal.c
+++ b/gegl/process/gegl-graph-traversal.c
@@ -167,6 +167,7 @@ gegl_graph_prepare (GeglGraphTraversal *path)
   for (list_iter = path->dfs_path; list_iter; list_iter = list_iter->next)
   {
     GeglNode *node = GEGL_NODE (list_iter->data);
+    GeglNode *parent;
     GeglOperation *operation = node->operation;
 
     g_mutex_lock (&node->mutex);
@@ -183,6 +184,13 @@ gegl_graph_prepare (GeglGraphTraversal *path)
 
     g_mutex_unlock (&node->mutex);
 
+    parent = gegl_node_get_parent (node);
+    while (parent != NULL && parent->operation != NULL)
+      {
+        gegl_operation_prepare (parent->operation);
+        parent = gegl_node_get_parent (parent);
+      }
+
     if (!g_hash_table_contains (path->contexts, node))
       {
         GeglOperationContext *context = gegl_operation_context_new (node->operation);