[gegl] process: get rid of warning about 0px processing

[Ãyvind KolÃs <ok src gnome org>]

commit 93960755c271ccb7ff04971e56b6fa5a466e9b28
Author: Ãyvind KolÃs <pippin gimp org>
Date:   Fri Mar 16 15:34:41 2012 +0000

    process: get rid of warning about 0px processing

 gegl/operation/gegl-operation.c  |    2 +-
 gegl/process/gegl-eval-visitor.c |   30 +++++++++++++++++++-----------
 2 files changed, 20 insertions(+), 12 deletions(-)
---
diff --git a/gegl/operation/gegl-operation.c b/gegl/operation/gegl-operation.c
index 65eb2b8..eb690ba 100644
--- a/gegl/operation/gegl-operation.c
+++ b/gegl/operation/gegl-operation.c
@@ -119,7 +119,7 @@ gegl_operation_process (GeglOperation       *operation,
       (result->width == 0 || result->height == 0))
     {
       GeglBuffer *output = gegl_buffer_new (NULL, NULL);
-      g_warning ("processing 0px rectangle");
+      g_warning ("%s Eeek: processing 0px rectangle", G_STRLOC);
       /* when this case is hit.. we've done something bad.. */
       gegl_operation_context_take_object (context, "output", G_OBJECT (output));
       return TRUE;
diff --git a/gegl/process/gegl-eval-visitor.c b/gegl/process/gegl-eval-visitor.c
index e328c6e..6ae6e45 100644
--- a/gegl/process/gegl-eval-visitor.c
+++ b/gegl/process/gegl-eval-visitor.c
@@ -81,17 +81,25 @@ gegl_eval_visitor_visit_pad (GeglVisitor *self,
         }
       else
         {
-          glong time      = gegl_ticks ();
+          if ((context->result_rect.width == 0 || context->result_rect.height == 0))
+            {
+              /* 0px processing, bail */
+              gegl_operation_context_take_object (context, "output", G_OBJECT (gegl_buffer_new (NULL, NULL)));
+            }
+          else
+            {
+              /* Make the operation do it's actual processing */
+              glong time      = gegl_ticks ();
 
-          /* Make the operation do it's actual processing */
-          GEGL_NOTE (GEGL_DEBUG_PROCESS, "For \"%s\" processing pad '%s' result_rect = %d, %d %dÃ%d",
-                     gegl_pad_get_name (pad), gegl_node_get_debug_name (node),
-                     context->result_rect.x, context->result_rect.y, context->result_rect.width, context->result_rect.height);
-          gegl_operation_process (operation, context, gegl_pad_get_name (pad),
-                                  &context->result_rect);
-          time      = gegl_ticks () - time;
+              GEGL_NOTE (GEGL_DEBUG_PROCESS, "For \"%s\" processing pad '%s' result_rect = %d, %d %dÃ%d",
+                         gegl_pad_get_name (pad), gegl_node_get_debug_name (node),
+                         context->result_rect.x, context->result_rect.y, context->result_rect.width, context->result_rect.height);
+              gegl_operation_process (operation, context, gegl_pad_get_name (pad),
+                                      &context->result_rect);
+              time      = gegl_ticks () - time;
 
-          gegl_instrument ("process", gegl_node_get_operation (node), time);
+              gegl_instrument ("process", gegl_node_get_operation (node), time);
+            }
 
           if (gegl_pad_get_num_connections (pad) > 1)
             {