From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Stefan Schake <stschake@gmail.com>,
dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [RFC PATCH hwc] drm_hwcomposer: set CRTC background color when available
Date: Fri, 29 Jun 2018 12:05:48 +0200 [thread overview]
Message-ID: <fb7302d2-e48f-62da-1719-65c3a4764848@linux.intel.com> (raw)
In-Reply-To: <1519271648-33102-1-git-send-email-stschake@gmail.com>
Op 22-02-18 om 04:54 schreef Stefan Schake:
> Android assumes an implicit black background layer is always present
> behind all layers it specifies for composition. drm_hwcomposer currently
> punts responsibility for this to the kernel/DRM platform and puts layers
> with per-pixel alpha content on the primary plane when requested.
>
> On some platforms (e.g. VC4) a background color fill has a cycle cost for
> the hardware composer and is not enabled by default. Instead, userland can
> request a background color through a CRTC property. Use this property to
> specify the implicit black background Android expects.
>
> Signed-off-by: Stefan Schake <stschake@gmail.com>
> ---
> Kernel changes for this (background_color) are available here:
>
> https://github.com/stschake/linux/commits/background-upstream
>
> Sending as RFC because I'm not entirely clear on whose responsibility
> this should be, on most DRM drivers it seems to be implicit. I think
> a case could also be made that VC4 should not accept alpha formats on
> the lowest layer or enable background color fill when given one anyway.
> On the other hand, userland control over background color seems desirable
> regardless and is a feature of multiple hardware composers (i915, vc4, omap).
Ping? Would be nice if we were moving forward. :)
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next prev parent reply other threads:[~2018-06-29 10:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-22 3:54 [RFC PATCH hwc] drm_hwcomposer: set CRTC background color when available Stefan Schake
2018-02-22 10:04 ` Robert Foss
2018-02-22 12:23 ` Stefan Schake
2018-02-22 20:47 ` Eric Anholt
2018-02-23 14:34 ` Stefan Schake
2018-02-28 10:53 ` Robert Foss
2018-03-02 0:41 ` Stefan Schake
2018-03-02 14:34 ` Robert Foss
2018-03-06 7:46 ` Daniel Vetter
2018-06-29 10:05 ` Maarten Lankhorst [this message]
2018-06-29 10:27 ` Stefan Schake
2018-07-02 12:22 ` Maarten Lankhorst
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