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From:   Daniel Vetter <daniel@ffwll.ch>
Date:   Thu, 4 Apr 2019 10:52:15 +0200
Message-ID: <CAKMK7uHiWu-kOa6SP0ZRstnrwdYR0MHgtHdHZPLWLXxWaQVPrQ@mail.gmail.com>
Subject: Re: [PATCH] drm/cirrus: rewrite and modernize driver.
To:     Gerd Hoffmann <kraxel@redhat.com>
Cc:     David Airlie <airlied@redhat.com>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        David Airlie <airlied@linux.ie>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@lists.linux-foundation.org>
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On Thu, Apr 4, 2019 at 10:30 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
>   Hi,
>
> > > Speaking of wayland:  Seems at least gnome-shell insists on using XR24.
> >
> > Yeah XR24 is pretty much mandatory. Noralf added a few helpers to
> > convert XR24 to other formats, for display not supporting anything
> > else. Because userspace.
>
> Have a pointer to these helpers?  grepping around in drm didn't turn up
> anything so far ...

tinydrm_xrgb8888_to_*

imo these could be put into some drm_format_helpers.c to be shared.
From a quick look the xrgb8888_to_rgb888 is missing, but for a quick
hack you can just use rgb565 to get going.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch