[gegl/gsoc2011-opencl-2: 15/22] GeglOperator and OpenCL

[Victor Matheus de Araujo Oliveira <vmaolive src gnome org>]

commit 68ff9a249aab6f6e90f95dd355d4ead278573b4f
Author: Victor Oliveira <victormatheus gmail com>
Date:   Fri Nov 18 17:05:57 2011 -0200

    GeglOperator and OpenCL
    
    GeglOperator doesn't cut up ROIs if a processing node is detected to
    have an dependent node which supports OpenCL.
    
    This is because tiling has too much overhead in the GPU.

 gegl/process/gegl-processor.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/gegl/process/gegl-processor.c b/gegl/process/gegl-processor.c
index 6f377ef..e36e8cd 100644
--- a/gegl/process/gegl-processor.c
+++ b/gegl/process/gegl-processor.c
@@ -32,6 +32,8 @@
 #include "gegl-types-internal.h"
 #include "gegl-utils.h"
 
+#include "graph/gegl-visitor.h"
+#include "graph/gegl-visitable.h"
 
 enum
 {
@@ -737,6 +739,23 @@ gegl_processor_work (GeglProcessor *processor,
   gboolean   more_work = FALSE;
   GeglCache *cache     = gegl_node_get_cache (processor->input);
 
+  /* OpenCL params */
+  GeglVisitor *visitor = g_object_new (GEGL_TYPE_VISITOR, NULL);
+  GSList *iterator = NULL;
+  GSList *visits_list = NULL;
+  gegl_visitor_reset (visitor);
+  gegl_visitor_dfs_traverse (visitor, GEGL_VISITABLE (processor->node));
+  visits_list = gegl_visitor_get_visits_list (visitor);
+
+  for (iterator = visits_list; iterator; iterator = iterator->next)
+    {
+      GeglNode *node = (GeglNode*) iterator->data;
+      if (GEGL_OPERATION_GET_CLASS(node->operation)->opencl_support)
+        {
+          processor->chunk_size = INT_MAX;
+        }
+    }
+
   more_work = gegl_processor_render (processor, &processor->rectangle, progress);
   if (more_work)
     {