new file mode 100644
--- /dev/null
+++ b/window/SDL_rotozoom.h
@@ -0,0 +1,99 @@
+
+/*
+
+ SDL_rotozoom - rotozoomer
+
+ LGPL (c) A. Schiffler
+
+*/
+
+#ifndef _SDL_rotozoom_h
+#define _SDL_rotozoom_h
+
+#include <math.h>
+
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef M_PI
+#define M_PI	3.141592654
+#endif
+
+#include <SDL.h>
+
+/* ---- Defines */
+
+#define SMOOTHING_OFF		0
+#define SMOOTHING_ON		1
+
+/* ---- Structures */
+
+    typedef struct tColorRGBA {
+	Uint8 r;
+	Uint8 g;
+	Uint8 b;
+	Uint8 a;
+    } tColorRGBA;
+
+    typedef struct tColorY {
+	Uint8 y;
+    } tColorY;
+
+
+/* ---- Prototypes */
+
+#ifdef WIN32
+#ifdef BUILD_DLL
+#define DLLINTERFACE __declspec(dllexport)
+#else
+#define DLLINTERFACE __declspec(dllimport)
+#endif
+#else
+#define DLLINTERFACE
+#endif
+
+/* 
+ 
+ rotozoomSurface()
+
+ Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
+ 'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
+ then the destination 32bit surface is anti-aliased. If the surface is not 8bit
+ or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
+
+*/
+
+    DLLINTERFACE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
+
+
+/* Returns the size of the target surface for a rotozoomSurface() call */
+
+    DLLINTERFACE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
+					  int *dstheight);
+
+/* 
+ 
+ zoomSurface()
+
+ Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
+ 'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
+ then the destination 32bit surface is anti-aliased. If the surface is not 8bit
+ or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
+
+*/
+
+    DLLINTERFACE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
+
+/* Returns the size of the target surface for a zoomSurface() call */
+
+    DLLINTERFACE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
+
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+};
+#endif
+
+#endif				/* _SDL_rotozoom_h */