[gegl] color-rotate: propagate BablSpace

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

commit e1db59326c23c29f1f834c6210eaeb40ab9892f0
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Jul 5 15:04:56 2018 +0200

    color-rotate: propagate BablSpace

 operations/common/color-rotate.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/operations/common/color-rotate.c b/operations/common/color-rotate.c
index 9ae3a03a6..3bf0e980d 100644
--- a/operations/common/color-rotate.c
+++ b/operations/common/color-rotate.c
@@ -99,13 +99,14 @@ property_double (saturation, _("Saturation"), 0.0)
 static void
 prepare (GeglOperation *operation)
 {
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
   /* gamma-corrected RGB because that's what the HSV conversion
    * functions expect
    */
   gegl_operation_set_format (operation, "input",
-                             babl_format ("R'G'B'A float"));
+                             babl_format_with_space ("R~G~B~A float", space));
   gegl_operation_set_format (operation, "output",
-                             babl_format ("R'G'B'A float"));
+                             babl_format_with_space ("R~G~B~A float", space));
 }
 
 static void