[gegl] threshold: propagate BablSpace

[Øyvind "pippin" Kolås <ok src gnome org>]

commit c82aa06e8d864f098a07fcd1c2d47af6fc23dab4
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Jul 5 22:01:49 2018 +0200

    threshold: propagate BablSpace

 operations/common/threshold.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/operations/common/threshold.c b/operations/common/threshold.c
index c23fe25eb..b1810facd 100644
--- a/operations/common/threshold.c
+++ b/operations/common/threshold.c
@@ -37,9 +37,10 @@ property_double (value, _("Threshold"), 0.5)
 
 static void prepare (GeglOperation *operation)
 {
-  gegl_operation_set_format (operation, "input",  babl_format ("Y'A float"));
-  gegl_operation_set_format (operation, "aux",    babl_format ("Y' float"));
-  gegl_operation_set_format (operation, "output", babl_format ("Y'A float"));
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("Y'A float", space));
+  gegl_operation_set_format (operation, "aux",    babl_format_with_space ("Y' float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("Y'A float", space));
 }
 
 static gboolean