[gegl] gegl-op: add GEGL_OP_BASE op-type to gegl-op.h

[Ell <ell src gnome org>]

commit dbc506a043178a0668f243cd0b736eec509f9cc6
Author: Ell <ell_se yahoo com>
Date:   Thu May 14 21:47:12 2020 +0300

    gegl-op: add GEGL_OP_BASE op-type to gegl-op.h
    
    When an op file defines GEGL_OP_BASE as the op type, gegl-op.h
    derives the op directly from GeglOperation.

 gegl/gegl-op.h | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/gegl/gegl-op.h b/gegl/gegl-op.h
index 387e39e17..5aff9f913 100644
--- a/gegl/gegl-op.h
+++ b/gegl/gegl-op.h
@@ -130,6 +130,11 @@ type_name##_register_type (GTypeModule *type_module)                    \
 #define MKCLASS(a)  MKCLASS2(a)
 #define MKCLASS2(a) a##Class
 
+#ifdef GEGL_OP_BASE
+#define GEGL_OP_Parent GeglOperation
+#define GEGL_OP_PARENT GEGL_TYPE_OPERATION
+#endif
+
 #ifdef GEGL_OP_POINT_FILTER
 #define GEGL_OP_Parent GeglOperationPointFilter
 #define GEGL_OP_PARENT GEGL_TYPE_OPERATION_POINT_FILTER