[cairo] pycairo and PIL

[James Evans]

I've been using pycairo to do some simple graphics for a project that I
need to access the image in PIL. Rather than using surface.write_to_png()
and then reading the image file into PIL I added a get_data() method to
the surface object that returns the data in Image.frombuffer() compatible
format.

I think this is an important piece of functionality to make cairo useful
to other python toolkits. I think this could be used as the basis for a
wxCairoDC to provide the power of cairo to wxPython based apps.

With this patch you can create a PIL image from a cairo surface with:
import Image
newimage = Image.frombuffer("RGBA", (surface.get_width(),
surface.get_height()), surface.get_data(), "raw", "RGBA", 0,1)

(I don't know why I need the 1 for the orientation, it's supposed to be
the default, but the image is upside down without it.)

This is a quick-and-dirty patch to add the functionality. Suggestions and
changes are welcome!

Thanks,

james evans


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