From mboxrd@z Thu Jan  1 00:00:00 1970
From: Damien Lespiau <damien.lespiau@intel.com>
Subject: Re: [PATCH 0/4] Adding support for plane alpha/color
 blending through drm property
Date: Thu, 20 Mar 2014 14:45:17 +0000
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On Thu, Mar 20, 2014 at 02:11:40PM +0000, Damien Lespiau wrote:
> (source is premultiplied)
> 
> RGBA = ADD(SRC_COLOR*SRC_ALPHA, DST_COLOR*ONE_MINUS_SRC_ALPHA)

Grr, copy/paste error. If the source is already premultiplied:

RGBA = ADD(SRC_COLOR, DST_COLOR*ONE_MINUS_SRC_ALPHA)

-- 
Damien