From: Eric Anholt <eric@anholt.net>
To: "Kristian H. Kristensen" <hoegsberg@gmail.com>,
dri-devel@lists.freedesktop.org
Cc: "Kristian H. Kristensen" <hoegsberg@chromium.org>
Subject: Re: [PATCH] drm/rockchip: Filter out alpha formats for primary plane
Date: Mon, 16 Apr 2018 14:59:22 -0700 [thread overview]
Message-ID: <87r2nelsn9.fsf@anholt.net> (raw)
In-Reply-To: <20180416190103.83171-1-hoegsberg@chromium.org>
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"Kristian H. Kristensen" <hoegsberg@gmail.com> writes:
> Rockchip doesn't support per-pixel alpha blending for the lowest
> window in the stack. While the hw supports restacking the windows, we
> don't expose that in KMS, so just filter out alpha formats for the
> primary plane.
In discussing this for VC4, we noted that an alternative is to just set
up the lowest plane as an RGBX format, since alpha is premultiplied and
the background is black.
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next prev parent reply other threads:[~2018-04-16 21:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-16 19:01 [PATCH] drm/rockchip: Filter out alpha formats for primary plane Kristian H. Kristensen
2018-04-16 20:38 ` Sean Paul
2018-04-16 21:59 ` Eric Anholt [this message]
2018-04-16 22:04 ` Kristian Høgsberg
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