[cairo] unable to make PIL work with cairo

[wecing]

Currently i'm writing a video player which uses cairo to draw subtitle on
each frame.
I successfully extracted all the frames as PIL Image objects, but I failed
to create cairo surfaces with that.
I refered to http://cairographics.org/pythoncairopil/ , but it seems that
maybe there're some problems in the document.

Here is the traceback:

  File "main.py", line 96, in video_observer
    img.get_data(), 'raw', 'RGBA', 0, 1)
  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 512, in
__getattr__
    raise AttributeError(name)
AttributeError: get_data
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