title: Python game on android image does not fill screen size
body: <p>I am using pygames for android to write a small game. 
  Therefore I request a screen of the size 960x540: </p>
  
  <pre><code>screen = pygame.display.set_mode((WIDTH, HEIGHT))
  background = pygame.image.load("floor.png").convert()
  backgroundrect = background.get_rect()
  </code></pre>
  
  <p>and in the main loop I draw a background image of the same size:</p>
  
  <pre><code>screen.blit(background, backgroundrect)
  </code></pre>
  
  <p>On my development machine everything is correct since the created window matches the requested size.
  What I get when I run on android is my background image centered in a window with different aspect ratio. This would not be so bad but in the space where no image should be drawn I see random garbage drawn. I can even fill the background with black beforehand and still see garbage.</p>
  
  <p>Somehow the draw of the background image also draws in the space outside of the aspect ratio?</p>
  
  <p>The bug is also described here: <a href="http://pygame.renpy.org/forum/viewtopic.php?f=4&amp;t=624&amp;p=4915#p4915" rel="nofollow">http://pygame.renpy.org/forum/viewtopic.php?f=4&amp;t=624&amp;p=4915#p4915</a> which contains a video showing the effect.</p>