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diff --git a/app/core/gimpundo.h b/app/core/gimpundo.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_UNDO_H__
+#define __GIMP_UNDO_H__
+
+
+#include "gimpviewable.h"
+
+
+struct _GimpUndoAccumulator
+{
+ gboolean mode_changed;
+ gboolean precision_changed;
+
+ gboolean size_changed;
+ gint previous_origin_x;
+ gint previous_origin_y;
+ gint previous_width;
+ gint previous_height;
+
+ gboolean resolution_changed;
+
+ gboolean unit_changed;
+};
+
+
+#define GIMP_TYPE_UNDO (gimp_undo_get_type ())
+#define GIMP_UNDO(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_UNDO, GimpUndo))
+#define GIMP_UNDO_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_UNDO, GimpUndoClass))
+#define GIMP_IS_UNDO(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_UNDO))
+#define GIMP_IS_UNDO_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_UNDO))
+#define GIMP_UNDO_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_UNDO, GimpUndoClass))
+
+
+typedef struct _GimpUndoClass GimpUndoClass;
+
+struct _GimpUndo
+{
+ GimpViewable parent_instance;
+
+ GimpImage *image; /* the image this undo is part of */
+ guint time; /* time of undo step construction */
+
+ GimpUndoType undo_type; /* undo type */
+ GimpDirtyMask dirty_mask; /* affected parts of the image */
+
+ GimpTempBuf *preview;
+ guint preview_idle_id;
+};
+
+struct _GimpUndoClass
+{
+ GimpViewableClass parent_class;
+
+ void (* pop) (GimpUndo *undo,
+ GimpUndoMode undo_mode,
+ GimpUndoAccumulator *accum);
+ void (* free) (GimpUndo *undo,
+ GimpUndoMode undo_mode);
+};
+
+
+GType gimp_undo_get_type (void) G_GNUC_CONST;
+
+void gimp_undo_pop (GimpUndo *undo,
+ GimpUndoMode undo_mode,
+ GimpUndoAccumulator *accum);
+void gimp_undo_free (GimpUndo *undo,
+ GimpUndoMode undo_mode);
+
+void gimp_undo_create_preview (GimpUndo *undo,
+ GimpContext *context,
+ gboolean create_now);
+void gimp_undo_refresh_preview (GimpUndo *undo,
+ GimpContext *context);
+
+const gchar * gimp_undo_type_to_name (GimpUndoType type);
+
+gboolean gimp_undo_is_weak (GimpUndo *undo);
+gint gimp_undo_get_age (GimpUndo *undo);
+void gimp_undo_reset_age (GimpUndo *undo);
+
+
+#endif /* __GIMP_UNDO_H__ */