--- a/pytouhou/ui/window.pyx
+++ b/pytouhou/ui/window.pyx
@@ -12,8 +12,6 @@
 ## GNU General Public License for more details.
 ##
 
-cimport cython
-
 from pytouhou.lib.opengl cimport \
          (glEnable, glHint, glEnableClientState, GL_TEXTURE_2D, GL_BLEND,
           GL_PERSPECTIVE_CORRECTION_HINT, GL_FOG_HINT, GL_NICEST,
@@ -88,7 +86,7 @@ cdef class Runner:
 
 
 cdef class Window:
-    def __init__(self, tuple size=None, bint double_buffer=True, long fps_limit=-1,
+    def __init__(self, bint double_buffer=True, long fps_limit=-1,
                  bint fixed_pipeline=False, bint sound=True):
         self.fps_limit = fps_limit
         self.use_fixed_pipeline = fixed_pipeline
@@ -99,15 +97,13 @@ cdef class Window:
         sdl.gl_set_attribute(sdl.GL_DOUBLEBUFFER, int(double_buffer))
         sdl.gl_set_attribute(sdl.GL_DEPTH_SIZE, 24)
 
-        self.width, self.height = size if size is not None else (640, 480)
-
         flags = sdl.WINDOW_OPENGL | sdl.WINDOW_SHOWN
         if not self.use_fixed_pipeline:
             flags |= sdl.WINDOW_RESIZABLE
 
         self.win = sdl.Window('PyTouhou',
                               sdl.WINDOWPOS_CENTERED, sdl.WINDOWPOS_CENTERED,
-                              self.width, self.height,
+                              640, 480, #XXX
                               flags)
         self.win.gl_create_context()
 
@@ -128,22 +124,9 @@ cdef class Window:
         self.clock = Clock(self.fps_limit)
 
 
-    @cython.cdivision(True)
     cdef void set_size(self, int width, int height) nogil:
         self.win.set_window_size(width, height)
 
-        runner_width = float(self.runner.width)
-        runner_height = float(self.runner.height)
-
-        scale = min(width / runner_width,
-                    height / runner_height)
-
-        self.width = int(runner_width * scale)
-        self.height = int(runner_height * scale)
-
-        self.x = (width - self.width) // 2
-        self.y = (height - self.height) // 2
-
 
     cpdef set_runner(self, Runner runner=None):
         self.runner = runner