[gegl] Fix bliting from a cached node (bug 722963)

[Daniel Sabo <daniels src gnome org>]

commit 55e2d90313284ecd6ac8e17d2b6ac7cb4d846a84
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Sat Jan 25 11:51:08 2014 -0800

    Fix bliting from a cached node (bug 722963)
    
    When processing a cached node the result was moved to
    operation_result but not the context's "output" pad.
    Allow the operation_result object to leak out of the
    loop so the final output can use it directly instead
    of querying the context again.

 gegl/process/gegl-graph-traversal.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/gegl/process/gegl-graph-traversal.c b/gegl/process/gegl-graph-traversal.c
index 3c281cd..458bf76 100644
--- a/gegl/process/gegl-graph-traversal.c
+++ b/gegl/process/gegl-graph-traversal.c
@@ -375,17 +375,19 @@ gegl_graph_process (GeglGraphTraversal *path)
   GeglBuffer *result = NULL;
   GeglOperationContext *context = NULL;
   GeglOperationContext *last_context = NULL;
+  GeglBuffer *operation_result = NULL;
 
   for (list_iter = path->dfs_path; list_iter; list_iter = list_iter->next)
     {
       GeglNode *node = GEGL_NODE (list_iter->data);
       GeglOperation *operation = node->operation;
-      GeglBuffer *operation_result = NULL;
       g_return_val_if_fail (node, NULL);
       g_return_val_if_fail (operation, NULL);
       
       GEGL_INSTRUMENT_START();
 
+      operation_result = NULL;
+
       if (last_context)
         gegl_operation_context_purge (last_context);
       
@@ -458,9 +460,8 @@ gegl_graph_process (GeglGraphTraversal *path)
   
   if (last_context)
     {
-      GValue *value = gegl_operation_context_get_value (context, "output");
-      if (value)
-        result = g_value_dup_object (value);
+      if (operation_result)
+        result = g_object_ref (operation_result);
       else if (gegl_node_has_pad (last_context->operation->node, "output"))
         result = g_object_ref (gegl_graph_get_shared_empty (path));
       gegl_operation_context_purge (last_context);