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, 10 insertions, 6 deletions

diff --git a/source/blender/src/editscreen.c b/source/blender/src/editscreen.c
index b8f26bddbef..b9aed992686 100644
--- a/source/blender/src/editscreen.c
+++ b/source/blender/src/editscreen.c
@@ -554,11 +554,14 @@ void markdirty_all()
 	ScrArea *sa;
 
 	for (sa= G.curscreen->areabase.first; sa; sa= sa->next) {
-		scrarea_queue_winredraw(sa);
-		sa->win_swap &= ~WIN_FRONT_OK;
-		
-		scrarea_queue_headredraw(sa);
-		sa->head_swap &= ~WIN_FRONT_OK;
+		if(sa->win) {
+			scrarea_queue_winredraw(sa);
+			sa->win_swap &= ~WIN_FRONT_OK;
+		}
+		if(sa->headwin) {
+			scrarea_queue_headredraw(sa);
+			sa->head_swap &= ~WIN_FRONT_OK;
+		}
 	}
 }
 
@@ -1870,6 +1873,7 @@ void setscreen(bScreen *sc)
 			sa= sa->next;
 		}		
 	}
+	else if(G.curscreen) markdirty_all();	/* at least redraw */
 
 	if (G.curscreen != sc) {
 		mywinset(sc->mainwin);
@@ -1916,7 +1920,7 @@ void setscreen(bScreen *sc)
 		
 		sa->cursor= CURSOR_STD;
 	}
-
+	
 	G.scene= sc->scene;
 	countall();