[gegl] stretch-contrast: implement get_cached_region

[Michael Henning <mhenning src gnome org>]

commit e72e6c03aa3be296affb80e95dd5fc16cb5d50ca
Author: Michael Henning <drawoc darkrefraction com>
Date:   Sat Dec 22 12:55:23 2012 -0500

    stretch-contrast: implement get_cached_region

 operations/common/stretch-contrast.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/stretch-contrast.c b/operations/common/stretch-contrast.c
index de769f8..e442424 100644
--- a/operations/common/stretch-contrast.c
+++ b/operations/common/stretch-contrast.c
@@ -70,7 +70,7 @@ static void prepare (GeglOperation *operation)
 }
 
 static GeglRectangle
-get_required_for_output (GeglOperation        *operation,
+get_required_for_output (GeglOperation       *operation,
                          const gchar         *input_pad,
                          const GeglRectangle *roi)
 {
@@ -78,6 +78,14 @@ get_required_for_output (GeglOperation        *operation,
   return result;
 }
 
+static GeglRectangle
+get_cached_region (GeglOperation       *operation,
+                   const GeglRectangle *roi)
+{
+  GeglRectangle result = *gegl_operation_source_get_bounding_box (operation, "input");
+  return result;
+}
+
 static gboolean
 process (GeglOperation       *operation,
          GeglBuffer          *input,
@@ -141,6 +149,7 @@ gegl_chant_class_init (GeglChantClass *klass)
   filter_class->process = process;
   operation_class->prepare = prepare;
   operation_class->get_required_for_output = get_required_for_output;
+  operation_class->get_cached_region = get_cached_region;
 
   gegl_operation_class_set_keys (operation_class,
     "name"       , "gegl:stretch-contrast",