Rotation and transparency

["G&B" <gbour nomade fr>]

I want to load and rotate an image. I proceed as follow:
        1. loading the picture into a GdkPixbuf
        2. setting affine transforme (with libart)
        3. performing transform an putting it in a rgb buffer
(with libart too)
        4. rendering the rgb buffer onto the screen

But I lost transparency!

Does anybody knows how to keep it?

        Regards. Guillaume
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