Fix T37599: Crash making linked objects local and undo

Root of the issues comes to the fact that it's possible to produce
a situation when library object data uses local object. This is
actually forbidden and not supported by .blend IO.

Made it so Make Local wouldn't produce such an unsupported states.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D372

1 files changed, 57 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_library_query.h b/source/blender/blenkernel/BKE_library_query.h
new file mode 100644
index 00000000000..50958f8ee80
--- /dev/null
+++ b/source/blender/blenkernel/BKE_library_query.h
@@ -0,0 +1,57 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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 2
+ * 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, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2014 by Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Sergey SHarybin.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+#ifndef __BKE_LIBRARY_QUERY_H__
+#define __BKE_LIBRARY_QUERY_H__
+
+/** \file BKE_library_query.h
+ *  \ingroup bke
+ *  \since March 2014
+ *  \author sergey
+ */
+
+struct ID;
+
+/* Tips for the callback for cases it's gonna to modify the pointer. */
+enum {
+	IDWALK_NOP = 0,
+	IDWALK_NEVER_NULL = (1 << 0),
+	IDWALK_NEVER_SELF = (1 << 1),
+};
+
+/* Call a callback for each ID link which the given ID uses.
+ *
+ * Return 'false' if you want to stop iteration.
+ */
+typedef bool (*LibraryIDLinkCallback) (void *user_data, struct ID **id_pointer, int cd_flag);
+
+/* Flags for the foreach function itself. */
+enum {
+	IDWALK_READONLY = (1 << 0),
+};
+
+/* Loop over all of the ID's this datablock links to. */
+void BKE_library_foreach_ID_link(struct ID *id, LibraryIDLinkCallback callback, void *user_data, int flag);
+
+#endif  /* __BKE_LIBRARY_QUERY_H__ */