Second itteration of global undo system. Now based on:

- file-to-memory save
- incremental difference steps (compression)

everthing has been tightly coded to use minimum of memcpy or allocs. In
fact this system works with a single full buffer (=file) in memory, and undosteps as differences from it.
Speed gain is factor 4-8 faster. I've added it in CTRL+ALT+T timer menu for
a test. Please note the gain is especially in the undo-storing, not in
retrieving undo.

Also new: file read option to skip UI read (file menu). This now also is
default for the undo system.

1 files changed, 58 insertions, 0 deletions

diff --git a/source/blender/blenloader/BLO_undofile.h b/source/blender/blenloader/BLO_undofile.h
new file mode 100644
index 00000000000..225b6bc15f5
--- /dev/null
+++ b/source/blender/blenloader/BLO_undofile.h
@@ -0,0 +1,58 @@
+/*
+ * $Id:
+ *
+ * ***** BEGIN GPL/BL DUAL 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. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2004 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ * external writefile function prototypes
+ */
+
+#ifndef BLO_UNDOFILE_H
+#define BLO_UNDOFILE_H
+
+typedef struct {
+	void *next, *prev;
+	
+	char *buf;
+	unsigned int ident, size;
+	
+} MemFileChunk;
+
+typedef struct MemFile {
+	ListBase chunks;
+	unsigned int size;
+} MemFile;
+
+/* actually only used writefile.c */
+extern void add_memfilechunk(MemFile *compare, MemFile *current, char *buf, unsigned int size);
+
+/* exports */
+extern void BLO_free_memfile(MemFile *memfile);
+extern void BLO_merge_memfile(MemFile *first, MemFile *second);
+
+#endif
+