[gegl] operations: softglow is clipping the output to the input extent

[Téo Mazars <teom src gnome org>]

commit 2d2dbf9b35edc292ad99cbd77ac2f34a797cd3fe
Author: Téo Mazars <teomazars gmail com>
Date:   Sun Nov 17 13:53:08 2013 +0100

    operations: softglow is clipping the output to the input extent
    
    since it's almost a point op, pixels outside the extent are not defined.

 operations/common/softglow.c    |   18 ++++++++++++++++--
 tests/compositions/softglow.xml |    8 --------
 2 files changed, 16 insertions(+), 10 deletions(-)
---
diff --git a/operations/common/softglow.c b/operations/common/softglow.c
index f2860bf..4f2f8aa 100644
--- a/operations/common/softglow.c
+++ b/operations/common/softglow.c
@@ -107,6 +107,19 @@ prepare (GeglOperation *operation)
                              babl_format ("RGBA float"));
 }
 
+static GeglRectangle
+get_bounding_box (GeglOperation *operation)
+{
+  GeglRectangle *region;
+
+  region = gegl_operation_source_get_bounding_box (operation, "input");
+
+  if (region != NULL)
+    return *region;
+  else
+    return *GEGL_RECTANGLE (0, 0, 0, 0);
+}
+
 static gboolean
 process (GeglOperation       *operation,
          GeglBuffer          *input,
@@ -241,8 +254,9 @@ gegl_chant_class_init (GeglChantClass *klass)
   operation_class = GEGL_OPERATION_CLASS (klass);
   filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
 
-  operation_class->prepare = prepare;
-  filter_class->process    = process;
+  operation_class->prepare          = prepare;
+  operation_class->get_bounding_box = get_bounding_box;
+  filter_class->process             = process;
 
   gegl_operation_class_set_keys (operation_class,
     "name",        "gegl:softglow",
diff --git a/tests/compositions/softglow.xml b/tests/compositions/softglow.xml
index 15333de..a65d6de 100644
--- a/tests/compositions/softglow.xml
+++ b/tests/compositions/softglow.xml
@@ -1,13 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <gegl>
-  <node operation='gegl:crop'>
-    <params>
-      <param name='x'>0</param>
-      <param name='y'>0</param>
-      <param name='width'>512</param>
-      <param name='height'>384</param>
-    </params>
-  </node>
   <node operation='gegl:softglow'>
     <params>
       <param name='glow-radius'>10.0</param>