[gegl] operations: don't process an infinite plane in stretch-contrast

[Téo Mazars <teom src gnome org>]

commit 7c6acab59bf622c4f7ca4bfcde9a9f708f55946e
Author: Téo Mazars <teomazars gmail com>
Date:   Sun Dec 22 12:06:56 2013 +0100

    operations: don't process an infinite plane in stretch-contrast

 operations/common/stretch-contrast.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/stretch-contrast.c b/operations/common/stretch-contrast.c
index de6bc2f..96cce28 100644
--- a/operations/common/stretch-contrast.c
+++ b/operations/common/stretch-contrast.c
@@ -99,6 +99,11 @@ get_required_for_output (GeglOperation       *operation,
                          const GeglRectangle *roi)
 {
   GeglRectangle result = *gegl_operation_source_get_bounding_box (operation, "input");
+
+  /* Don't request an infinite plane */
+  if (gegl_rectangle_is_infinite_plane (&result))
+    return *GEGL_RECTANGLE (0, 0, 0, 0);
+
   return result;
 }
 
@@ -450,6 +455,10 @@ process (GeglOperation       *operation,
   GeglChantO         *o;
   gint                c;
 
+  /* Don't process an infinite plane */
+  if (gegl_rectangle_is_infinite_plane (result))
+    return FALSE;
+
   if (gegl_cl_is_accelerated ())
     if (cl_process (operation, input, output, result))
       return TRUE;