linux-kernel - Re: [PATCH v2 06/10] media: Add ABGR32

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Message-ID: <fb0cbea01cdb9dc526b458f234eec656300983fb.camel@ndufresne.ca>
Date:   Fri, 10 Feb 2023 11:30:48 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        mirela.rabulea@....nxp.com, hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, xiahong.bao@....com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 06/10] media: Add ABGR32_12 video format

Le mercredi 01 février 2023 à 14:02 +0800, Ming Qian a écrit :
> ABGR32_12 is a reversed RGB format with alpha channel last,
> 12 bits per component like ABGR32,
> expanded to 16bits.
> Data in the 12 high bits, zeros in the 4 low bits,
> arranged in little endian order.

I would like to suggest ABGR64_12

Nicolas

> 
> Signed-off-by: Ming Qian <ming.qian@....com>
> ---
>  Documentation/userspace-api/media/v4l/pixfmt-rgb.rst | 9 +++++++++
>  drivers/media/v4l2-core/v4l2-common.c                | 1 +
>  drivers/media/v4l2-core/v4l2-ioctl.c                 | 1 +
>  include/uapi/linux/videodev2.h                       | 1 +
>  4 files changed, 12 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst b/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst
> index da29ba69c2d9..cb60ffe8f860 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst
> @@ -793,6 +793,15 @@ arranged in little endian order.
>        - G\ :sub:`15-4`
>        - R\ :sub:`15-4`
>        -
> +    * .. _V4L2-PIX-FMT-ABGR32-12:
> +
> +      - ``V4L2_PIX_FMT_ABGR32_12``
> +      - 'B412'
> +
> +      - B\ :sub:`15-4`
> +      - G\ :sub:`15-4`
> +      - R\ :sub:`15-4`
> +      - A\ :sub:`15-4`
>  
>  .. raw:: latex
>  
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index 024190f82cf1..4b3302a07f83 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -253,6 +253,7 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
>  		{ .format = V4L2_PIX_FMT_RGB555,  .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
>  		{ .format = V4L2_PIX_FMT_BGR666,  .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
>  		{ .format = V4L2_PIX_FMT_BGR24_12, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> +		{ .format = V4L2_PIX_FMT_ABGR32_12, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 8, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
>  
>  		/* YUV packed formats */
>  		{ .format = V4L2_PIX_FMT_YUYV,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 329515786abb..0f772e19890b 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1299,6 +1299,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_PIX_FMT_RGBA32:	descr = "32-bit RGBA 8-8-8-8"; break;
>  	case V4L2_PIX_FMT_RGBX32:	descr = "32-bit RGBX 8-8-8-8"; break;
>  	case V4L2_PIX_FMT_BGR24_12:	descr = "12-bit Depth BGR"; break;
> +	case V4L2_PIX_FMT_ABGR32_12:	descr = "12-bit Depth BGRA"; break;
>  	case V4L2_PIX_FMT_GREY:		descr = "8-bit Greyscale"; break;
>  	case V4L2_PIX_FMT_Y4:		descr = "4-bit Greyscale"; break;
>  	case V4L2_PIX_FMT_Y6:		descr = "6-bit Greyscale"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index ab52a605e6c0..757ab14e7a6e 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -579,6 +579,7 @@ struct v4l2_pix_format {
>  
>  /* RGB formats (6 or 8 bytes per pixel) */
>  #define V4L2_PIX_FMT_BGR24_12    v4l2_fourcc('B', '3', '1', '2') /* 48  BGR 12-bit per component */
> +#define V4L2_PIX_FMT_ABGR32_12   v4l2_fourcc('B', '4', '1', '2') /* 64  BGRA 12-bit per component */
>  
>  /* Grey formats */
>  #define V4L2_PIX_FMT_GREY    v4l2_fourcc('G', 'R', 'E', 'Y') /*  8  Greyscale     */