Index: trunk/src/draw.c
===================================================================
--- trunk/src/draw.c	(revision 4616)
+++ trunk/src/draw.c	(revision 4617)
@@ -59,7 +59,6 @@
  * some local identifiers
  */
 
-/* the minimum box that needs to be redrawn */
 BoxType pcb_draw_invalidated = { MAXINT, MAXINT, -MAXINT, -MAXINT };
 
 static int doing_pinout = 0;
@@ -145,19 +144,6 @@
 	gui->set_color(Output.fgGC, color);
 }
 
-/*---------------------------------------------------------------------------
- *  Adds the update rect to the update region
- */
-static void pcb_draw_invalidate(void *b)
-{
-	BoxType *box = (BoxType *) b;
-
-	pcb_draw_invalidated.X1 = MIN(pcb_draw_invalidated.X1, box->X1);
-	pcb_draw_invalidated.X2 = MAX(pcb_draw_invalidated.X2, box->X2);
-	pcb_draw_invalidated.Y1 = MIN(pcb_draw_invalidated.Y1, box->Y1);
-	pcb_draw_invalidated.Y2 = MAX(pcb_draw_invalidated.Y2, box->Y2);
-}
-
 /*
  * initiate the actual redrawing of the updated area
  */
Index: trunk/src/draw.h
===================================================================
--- trunk/src/draw.h	(revision 4616)
+++ trunk/src/draw.h	(revision 4617)
@@ -56,6 +56,20 @@
 		pcb_draw_inhibit--; \
 } while(0) \
 
+/* the minimum box that needs to be redrawn */
+extern BoxType pcb_draw_invalidated;
+
+/* Adds the update rect to the invalidated region. This schedules the object
+   for redraw (by Draw()). obj is anything that can be casted to BoxType */
+#define pcb_draw_invalidate(obj) \
+do { \
+	BoxType *box = (BoxType *)obj; \
+	pcb_draw_invalidated.X1 = MIN(pcb_draw_invalidated.X1, box->X1); \
+	pcb_draw_invalidated.X2 = MAX(pcb_draw_invalidated.X2, box->X2); \
+	pcb_draw_invalidated.Y1 = MIN(pcb_draw_invalidated.Y1, box->Y1); \
+	pcb_draw_invalidated.Y2 = MAX(pcb_draw_invalidated.Y2, box->Y2); \
+} while(0)
+
 void Draw(void);
 void Redraw(void);
 void DrawVia(PinTypePtr);