# ../gegl/operation/gegl-operation-meta.h

    /* This file is part of GEGL
     *
     * GEGL is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Lesser General Public
     * License as published by the Free Software Foundation; either
     * version 3 of the License, or (at your option) any later version.
     *
     * GEGL is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * Lesser General Public License for more details.
     *
     * You should have received a copy of the GNU Lesser General Public
     * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
     *
     * Copyright 2006 Øyvind Kolås
     */

    /* GeglOperationMeta
     * Used for GEGL operations that are implemented as a sub-graph, at the moment
     * these are defined as C files but should in the future be possible to declare
     * as XML instead.
     */

    #ifndef __GEGL_OPERATION_META_H__
    #define __GEGL_OPERATION_META_H__

    #include "gegl-operation.h"

    G_BEGIN_DECLS

    #define GEGL_TYPE_OPERATION_META            (gegl_operation_meta_get_type ())
    #define GEGL_OPERATION_META(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GEGL_TYPE_OPERATION_META, GeglOperationMeta))
    #define GEGL_OPERATION_META_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GEGL_TYPE_OPERATION_META, GeglOperationMetaClass))
    #define GEGL_IS_OPERATION_META(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GEGL_TYPE_OPERATION_META))
    #define GEGL_IS_OPERATION_META_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GEGL_TYPE_OPERATION_META))
    #define GEGL_OPERATION_META_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GEGL_TYPE_OPERATION_META, GeglOperationMetaClass))

    typedef struct _GeglOperationMeta  GeglOperationMeta;
    struct _GeglOperationMeta
    {
      GeglOperation parent_instance;

      GSList       *redirects;
    };

    typedef struct _GeglOperationMetaClass GeglOperationMetaClass;
    struct _GeglOperationMetaClass
    {
      GeglOperationClass parent_class;
      gpointer           pad[4];
    };

    GType gegl_operation_meta_get_type         (void) G_GNUC_CONST;

    void  gegl_operation_meta_redirect         (GeglOperation     *operation,
                                                const gchar       *name,
                                                GeglNode          *internal,
                                                const gchar       *internal_name);

    void  gegl_operation_meta_property_changed (GeglOperationMeta *self,
                                                GParamSpec        *arg1,
                                                gpointer           user_data);

    G_END_DECLS

    #endif