The Quake III Arena sources as originally released under the GPL license on August 20, 2005.

q3radiant/Undo.h

@@ -0,0 +1,64 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code 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.
+
+Quake III Arena source code 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 Foobar; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+//
+//
+// QERadiant Multilevel Undo/Redo
+//
+// 
+
+//start operation
+void Undo_Start(char *operation);
+//end operation
+void Undo_End(void);
+//add brush to the undo
+void Undo_AddBrush(brush_t *pBrush);
+//add a list with brushes to the undo
+void Undo_AddBrushList(brush_t *brushlist);
+//end a brush after the operation is performed
+void Undo_EndBrush(brush_t *pBrush);
+//end a list with brushes after the operation is performed
+void Undo_EndBrushList(brush_t *brushlist);
+//add entity to undo
+void Undo_AddEntity(entity_t *entity);
+//end an entity after the operation is performed
+void Undo_EndEntity(entity_t *entity);
+//undo last operation
+void Undo_Undo(void);
+//redo last undone operation
+void Undo_Redo(void);
+//returns true if there is something to be undone available
+int  Undo_UndoAvailable(void);
+//returns true if there is something to redo available
+int  Undo_RedoAvailable(void);
+//clear the undo buffer
+void Undo_Clear(void);
+//set maximum undo size (default 64)
+void Undo_SetMaxSize(int size);
+//get maximum undo size
+int  Undo_GetMaxSize(void);
+//set maximum undo memory in bytes (default 2 MB)
+void Undo_SetMaxMemorySize(int size);
+//get maximum undo memory in bytes
+int  Undo_GetMaxMemorySize(void);
+//returns the amount of memory used by undo
+int  Undo_MemorySize(void);
+