1 files changed, 131 insertions, 0 deletions
diff --git a/source/blender/editors/metaball/editmball_undo.c b/source/blender/editors/metaball/editmball_undo.c
new file mode 100644
index 00000000000..974bfb237d3
--- /dev/null
+++ b/source/blender/editors/metaball/editmball_undo.c
@@ -0,0 +1,131 @@
+/*
+ * ***** 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.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/metaball/editmball_undo.c
+ *  \ingroup edmeta
+ */
+
+#include <math.h>
+#include <string.h>
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_utildefines.h"
+#include "BLI_listbase.h"
+
+#include "DNA_defs.h"
+#include "DNA_meta_types.h"
+#include "DNA_object_types.h"
+
+#include "BKE_context.h"
+
+#include "ED_mball.h"
+#include "ED_util.h"
+
+typedef struct UndoMBall {
+	ListBase editelems;
+	int lastelem_index;
+} UndoMBall;
+
+/* free all MetaElems from ListBase */
+static void freeMetaElemlist(ListBase *lb)
+{
+	MetaElem *ml;
+
+	if (lb == NULL) {
+		return;
+	}
+
+	while ((ml = BLI_pophead(lb))) {
+		MEM_freeN(ml);
+	}
+}
+
+static void undoMball_to_editMball(void *umb_v, void *mb_v, void *UNUSED(obdata))
+{
+	MetaBall *mb = mb_v;
+	UndoMBall *umb = umb_v;
+
+	freeMetaElemlist(mb->editelems);
+	mb->lastelem = NULL;
+
+	/* copy 'undo' MetaElems to 'edit' MetaElems */
+	int index = 0;
+	for (MetaElem *ml_undo = umb->editelems.first; ml_undo; ml_undo = ml_undo->next, index += 1) {
+		MetaElem *ml_edit = MEM_dupallocN(ml_undo);
+		BLI_addtail(mb->editelems, ml_edit);
+		if (index == umb->lastelem_index) {
+			mb->lastelem = ml_edit;
+		}
+	}
+	
+}
+
+static void *editMball_to_undoMball(void *mb_v, void *UNUSED(obdata))
+{
+	MetaBall *mb = mb_v;
+	UndoMBall *umb;
+
+	/* allocate memory for undo ListBase */
+	umb = MEM_callocN(sizeof(UndoMBall), __func__);
+	umb->lastelem_index = -1;
+	
+	/* copy contents of current ListBase to the undo ListBase */
+	int index = 0;
+	for (MetaElem *ml_edit = mb->editelems->first; ml_edit; ml_edit = ml_edit->next, index += 1) {
+		MetaElem *ml_undo = MEM_dupallocN(ml_edit);
+		BLI_addtail(&umb->editelems, ml_undo);
+		if (ml_edit == mb->lastelem) {
+			umb->lastelem_index = index;
+		}
+	}
+	
+	return umb;
+}
+
+/* free undo ListBase of MetaElems */
+static void free_undoMball(void *umb_v)
+{
+	UndoMBall *umb = umb_v;
+	
+	freeMetaElemlist(&umb->editelems);
+	MEM_freeN(umb);
+}
+
+static MetaBall *metaball_get_obdata(Object *ob)
+{
+	if (ob && ob->type == OB_MBALL) {
+		return ob->data;
+	}
+	return NULL;
+}
+
+
+static void *get_data(bContext *C)
+{
+	Object *obedit = CTX_data_edit_object(C);
+	return metaball_get_obdata(obedit);
+}
+
+/* this is undo system for MetaBalls */
+void undo_push_mball(bContext *C, const char *name)
+{
+	undo_editmode_push(C, name, get_data, free_undoMball, undoMball_to_editMball, editMball_to_undoMball, NULL);
+}