Draw a rotating face
=====================================

This demo shows a couple of uses of bitmap images as masks. You can use them either as textures for images or as the mask for another texture (the face on the left is used as a mask for a blue and yellow grating).

To work the demo needs a square image called face.jpg (e.g. :download:`../images/face.jpg`) 

.. image:: ../images/demo_face.jpg
   :target: documentation.html
   :alt: draw a drifting plaid

.. literalinclude:: face.py
