linux-kernel - Re: [PATCH 19/20] lib: image-formats: Add more functions

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Date:   Wed, 17 Apr 2019 14:39:36 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH 19/20] lib: image-formats: Add more functions

Hi,

On Wed, 2019-04-17 at 09:54 +0200, Maxime Ripard wrote:
> V4L2 drivers typically need a few more helpers compared to DRM drivers, so
> let's add them.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> ---
>  include/linux/image-formats.h | 42 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 42 insertions(+)
> 
> diff --git a/include/linux/image-formats.h b/include/linux/image-formats.h
> index b78b8e861fc9..a2cf3528bd31 100644
> --- a/include/linux/image-formats.h
> +++ b/include/linux/image-formats.h
> @@ -388,6 +388,48 @@ uint64_t image_format_info_min_pitch(const struct image_format_info *info,
>  			    image_format_info_block_height(info, plane));
>  }
>  
> +/**
> + * image_format_info_plane_stride - determine the stride value
> + * @format: pointer to the image_format_info
> + * @width: plane width
> + * @plane: plane index
> + *
> + * Returns:
> + * The bytes per pixel value for the specified plane.

Looks like this needs to be updated to "bytes per line" ;)

Cheers,

Paul

> + */
> +static inline
> +unsigned int image_format_info_plane_stride(const struct image_format_info *format,
> +					    unsigned int width, int plane)
> +{
> +	if (!format || plane >= format->num_planes)
> +		return 0;
> +
> +	return image_format_info_plane_width(format, width, plane) *
> +		image_format_info_plane_cpp(format, plane);
> +}
> +
> +/**
> + * image_format_info_plane_size - determine the size value
> + * @format: pointer to the image_format_info
> + * @width: plane width
> + * @height: plane width
> + * @plane: plane index
> + *
> + * Returns:
> + * The size of the plane buffer.
> + */
> +static inline
> +unsigned int image_format_info_plane_size(const struct image_format_info *format,
> +					  unsigned int width, unsigned int height,
> +					  int plane)
> +{
> +	if (!format || plane >= format->num_planes)
> +		return 0;
> +
> +	return image_format_info_plane_stride(format, width, plane) *
> +		image_format_info_plane_height(format, height, plane);
> +}
> +
>  const struct image_format_info *__image_format_drm_lookup(u32 drm);
>  const struct image_format_info *__image_format_v4l2_lookup(u32 v4l2);
>  const struct image_format_info *image_format_drm_lookup(u32 drm);
-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com