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, 5 insertions, 2 deletions

diff --git a/source/blender/blenloader/BLO_writefile.h b/source/blender/blenloader/BLO_writefile.h
index 1bbbf7ea4c9..cfa2fd7b0f6 100644
--- a/source/blender/blenloader/BLO_writefile.h
+++ b/source/blender/blenloader/BLO_writefile.h
@@ -34,8 +34,11 @@
 #ifndef BLO_WRITEFILE_H
 #define BLO_WRITEFILE_H
 
-int BLO_write_file(char *dir, int write_flags, char **error_r);
-void BLO_write_runtime(char *file, char *exename);
+struct MemFile;
+
+extern int BLO_write_file(char *dir, int write_flags, char **error_r);
+extern int BLO_write_file_mem(struct MemFile *compare, struct MemFile *current, int write_flags, char **error_r);
+extern void BLO_write_runtime(char *file, char *exename);
 
 #endif