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Date: Wed,  4 Mar 2009 16:05:27 -0700
Message-ID: <14ec7b180903041505w1f85c741qa00715bc33bda891@mail.gmail.com>
From: andrey mirtchovski <mirtchovski@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] Porter-Duff alpha blending
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> however it won't fix the program that you originally
> sent.

the "fix" (if you can call sidestepping the problem :a fix") for the
original program is to use RGB24 as the channel for black's
allocimage():

       black = allocimage(display, Rect(0, 0, Dx(screen->r),
Dy(screen->r)), RGB24, 0, DBlack);