how to fade in - fade out a surface?

Davide Calaminici <[email protected]>
Newsgroups gmane.comp.lib.cairo
Message-ID <CAEjMnserqUH_gjris-cbSdGSjb4y7O6iEJ7X8zCLSXkY=EDFFA@mail.gmail.com>
As above. What is the best way to fade in/out a surface?

Thank you very much.

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