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diff --git a/qemu/ui/sdl_zoom.h b/qemu/ui/sdl_zoom.h
new file mode 100644
index 000000000..74955bc94
--- /dev/null
+++ b/qemu/ui/sdl_zoom.h
@@ -0,0 +1,25 @@
+/*
+ * SDL_zoom - surface scaling
+ * 
+ * Copyright (c) 2009 Citrix Systems, Inc.
+ *
+ * Derived from: SDL_rotozoom,  LGPL (c) A. Schiffler from the SDL_gfx library.
+ * Modifications by Stefano Stabellini.
+ *
+ * This work is licensed under the terms of the GNU GPL version 2.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef SDL_zoom_h
+#define SDL_zoom_h
+
+#include <SDL.h>
+
+#define SMOOTHING_OFF		0
+#define SMOOTHING_ON		1
+
+int sdl_zoom_blit(SDL_Surface *src_sfc, SDL_Surface *dst_sfc,
+                  int smooth, SDL_Rect *src_rect);
+
+#endif /* SDL_zoom_h */