[gimp] app: gimp:grow propagate babl space

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

commit 045328c88908cc84657d0b7b057ea0dd1c024ffb
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Jul 6 14:53:16 2018 +0200

    app: gimp:grow propagate babl space

 app/operations/gimpoperationgrow.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/app/operations/gimpoperationgrow.c b/app/operations/gimpoperationgrow.c
index 1e3b79d8a6..5ec2d2ccaf 100644
--- a/app/operations/gimpoperationgrow.c
+++ b/app/operations/gimpoperationgrow.c
@@ -167,8 +167,9 @@ gimp_operation_grow_set_property (GObject      *object,
 static void
 gimp_operation_grow_prepare (GeglOperation *operation)
 {
-  gegl_operation_set_format (operation, "input",  babl_format ("Y float"));
-  gegl_operation_set_format (operation, "output", babl_format ("Y float"));
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("Y float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
 }
 
 static GeglRectangle
@@ -235,8 +236,8 @@ gimp_operation_grow_process (GeglOperation       *operation,
    * Blame all bugs in this function on jaycox gimp org
    */
   GimpOperationGrow *self          = GIMP_OPERATION_GROW (operation);
-  const Babl        *input_format  = babl_format ("Y float");
-  const Babl        *output_format = babl_format ("Y float");
+  const Babl        *input_format  = gegl_operation_get_format (operation, "input");
+  const Babl        *output_format = gegl_operation_get_format (operation, "output");
   gint32             i, j, x, y;
   gfloat           **buf;  /* caches the region's pixel data */
   gfloat            *out;  /* holds the new scan line we are computing */