More compositing goodies.

- Texture Node
Allows to use any Blender Texture block as input for masks or color
blending. The texture node doesn't generate a real image, but adjusts to
the size as mapped with during an operation. So it won't work to use it
as Image input for Blur or Filter nodes.

Note; the Vector inputs for this node only work with manual input now!

- Translation Node
Give any image an offset in X or Y direction

For the Texture node to work, I needed to move the central 'pixel
processor' up one level... to allow differently sized images to merge
and allow 'procedural images' without size.

Temporal image of the day: http://www.blender.org/bf/rt.jpg

source/blender/src/space.c

@@ -147,6 +147,7 @@
 
 #include "BPY_extern.h"
 
+#include "butspace.h"
 #include "mydevice.h"
 #include "blendef.h"
 #include "datatoc.h"
@@ -5075,6 +5076,11 @@ void allqueue(unsigned short event, short val)
 					scrarea_queue_winredraw(sa);
 				}
 				break;
+			case RECALC_COMPOSITE:
+				if(sa->spacetype==SPACE_NODE) {
+					addqueue(sa->win, UI_BUT_EVENT, B_NODE_TREE_EXEC);
+				}
+				break;
 			case REDRAWANIM:
 				if ELEM6(sa->spacetype, SPACE_IPO, SPACE_SOUND, SPACE_TIME, SPACE_NLA, SPACE_ACTION, SPACE_SEQ) {
 					scrarea_queue_winredraw(sa);