--- a/src/viewport.cpp	Wed Jun 13 12:05:56 2007 +0000
+++ b/src/viewport.cpp	Tue Jun 19 07:21:01 2007 +0000
@@ -24,6 +24,7 @@
 #include "variables.h"
 #include "train.h"
 #include "roadveh.h"
+#include "blitter/factory.hpp"
 
 #define VIEWPORT_DRAW_MEM (65536 * 2)
 
@@ -1269,7 +1270,7 @@
 	x = UnScaleByZoom(vd.dpi.left - (vp->virtual_left & mask), vp->zoom) + vp->left;
 	y = UnScaleByZoom(vd.dpi.top - (vp->virtual_top & mask), vp->zoom) + vp->top;
 
-	vd.dpi.dst_ptr = old_dpi->dst_ptr + x - old_dpi->left + (y - old_dpi->top) * old_dpi->pitch;
+	vd.dpi.dst_ptr = BlitterFactoryBase::GetCurrentBlitter()->MoveTo(old_dpi->dst_ptr, x - old_dpi->left, y - old_dpi->top);
 
 	vd.parent_list = parent_list;
 	vd.eof_parent_list = endof(parent_list);