title: Blit transparent images with Allegro
body: <p>I'm wondering if there is any possibility to draw png with transparent colors, so I can make something half-transparent. I've read <a href="http://www.allegro.cc/manual/4/api/transparency-and-patterned-drawing/" rel="nofollow noreferrer">this</a> but I can't get anything to work. I also heard about alpng library but I don't know if it's able to load transparency too.
  I'm using <code>allegro 4.2.1</code> with the newest <code>Dev-C++</code>.</p>