linux-kernel - Re: [PATCH v18 1/8] drm/vkms: Document pixel_argb

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Message-ID: <20250417113827.7c69631a@eldfell>
Date: Thu, 17 Apr 2025 11:38:27 +0300
From: Pekka Paalanen <pekka.paalanen@...oniitty.fi>
To: Louis Chauvet <louis.chauvet@...tlin.com>
Cc: Melissa Wen <melissa.srw@...il.com>, Maíra Canal
 <mairacanal@...eup.net>, Haneen Mohammed <hamohammed.sa@...il.com>, Maarten
 Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
 <airlied@...il.com>, rdunlap@...radead.org, arthurgrillo@...eup.net,
 Jonathan Corbet <corbet@....net>, Simona Vetter <simona@...ll.ch>, Rodrigo
 Siqueira <siqueira@...lia.com>, Simona Vetter <simona.vetter@...ll.ch>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com,
 thomas.petazzoni@...tlin.com, seanpaul@...gle.com, marcheu@...gle.com,
 nicolejadeyee@...gle.com, linux-doc@...r.kernel.org
Subject: Re: [PATCH v18 1/8] drm/vkms: Document pixel_argb_u16

On Tue, 15 Apr 2025 15:55:32 +0200
Louis Chauvet <louis.chauvet@...tlin.com> wrote:

> The meaning of each member of the structure was not specified. To clarify
> the format used and the reason behind those choices, add some
> documentation.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
>  drivers/gpu/drm/vkms/vkms_drv.h | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index a74a7fc3a056..3b7b46dd026f 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -45,6 +45,23 @@ struct vkms_frame_info {
>  	unsigned int rotation;
>  };
>  
> +/**
> + * struct pixel_argb_u16 - Internal representation of a pixel color.
> + * @a: Alpha component value, stored in 16 bits, without padding, using
> + *     machine endianness
> + * @r: Red component value, stored in 16 bits, without padding, using
> + *     machine endianness
> + * @g: Green component value, stored in 16 bits, without padding, using
> + *     machine endianness
> + * @b: Blue component value, stored in 16 bits, without padding, using
> + *     machine endianness
> + *
> + * The goal of this structure is to keep enough precision to ensure
> + * correct composition results in VKMS and simplifying color
> + * manipulation by splitting each component into its own field.
> + * Caution: the byte ordering of this structure is machine-dependent,
> + * you can't cast it directly to AR48 or xR48.
> + */
>  struct pixel_argb_u16 {
>  	u16 a, r, g, b;
>  };
> 

Reviewed-by: Pekka Paalanen <pekka.paalanen@...labora.com>


Thanks,
pq

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