With this class you can load a picture and blit it on the screen
in a variety of modes. The shape can be masked to allow for transparency
effects. There is also a buffered blit, that is to say the background will
be automatically stored, and you can restore it with a simple call to the
unbuffer() method. Last but not least, you can also instruct the blitter
to scale your shape while drawing it on the scene.
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