Hi Laurent,

On Thu, Mar 28, 2019 at 09:07:15AM +0200, Laurent Pinchart wrote:
> The V4L2 API is missing the 32-bit RGB formats for the ABGR, XBGR, RGBA
> and RGBX component orders. Add them, using the same 4CCs as DRM.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>  .../media/uapi/v4l/pixfmt-packed-rgb.rst      | 160 ++++++++++++++++++
>  include/uapi/linux/videodev2.h                |   4 +
>  2 files changed, 164 insertions(+)
>
> diff --git a/Documentation/media/uapi/v4l/pixfmt-packed-rgb.rst b/Documentation/media/uapi/v4l/pixfmt-packed-rgb.rst
> index 6b3781c04dd5..055f9c89e787 100644
> --- a/Documentation/media/uapi/v4l/pixfmt-packed-rgb.rst
> +++ b/Documentation/media/uapi/v4l/pixfmt-packed-rgb.rst
> @@ -453,6 +453,166 @@ next to each other in memory.
>        - r\ :sub:`1`
>        - r\ :sub:`0`
>
> +      -
> +      -
> +      -
> +      -
> +      -
> +      -
> +      -
> +      -
> +    * .. _V4L2-PIX-FMT-BGRA32:
> +
> +      - ``V4L2_PIX_FMT_BGRA32``
> +      - 'RA24'
> +
> +      - a\ :sub:`7`
> +      - a\ :sub:`6`
> +      - a\ :sub:`5`
> +      - a\ :sub:`4`
> +      - a\ :sub:`3`
> +      - a\ :sub:`2`
> +      - a\ :sub:`1`
> +      - a\ :sub:`0`
> +
> +      - b\ :sub:`7`
> +      - b\ :sub:`6`
> +      - b\ :sub:`5`
> +      - b\ :sub:`4`
> +      - b\ :sub:`3`
> +      - b\ :sub:`2`
> +      - b\ :sub:`1`
> +      - b\ :sub:`0`
> +
> +      - g\ :sub:`7`
> +      - g\ :sub:`6`
> +      - g\ :sub:`5`
> +      - g\ :sub:`4`
> +      - g\ :sub:`3`
> +      - g\ :sub:`2`
> +      - g\ :sub:`1`
> +      - g\ :sub:`0`
> +
> +      - r\ :sub:`7`
> +      - r\ :sub:`6`
> +      - r\ :sub:`5`
> +      - r\ :sub:`4`
> +      - r\ :sub:`3`
> +      - r\ :sub:`2`
> +      - r\ :sub:`1`
> +      - r\ :sub:`0`
> +    * .. _V4L2-PIX-FMT-BGRX32:
> +
> +      - ``V4L2_PIX_FMT_BGRX32``
> +      - 'RX24'
> +
> +      -
> +      -
> +      -
> +      -
> +      -
> +      -
> +      -
> +      -
> +
> +      - b\ :sub:`7`
> +      - b\ :sub:`6`
> +      - b\ :sub:`5`
> +      - b\ :sub:`4`
> +      - b\ :sub:`3`
> +      - b\ :sub:`2`
> +      - b\ :sub:`1`
> +      - b\ :sub:`0`
> +
> +      - g\ :sub:`7`
> +      - g\ :sub:`6`
> +      - g\ :sub:`5`
> +      - g\ :sub:`4`
> +      - g\ :sub:`3`
> +      - g\ :sub:`2`
> +      - g\ :sub:`1`
> +      - g\ :sub:`0`
> +
> +      - r\ :sub:`7`
> +      - r\ :sub:`6`
> +      - r\ :sub:`5`
> +      - r\ :sub:`4`
> +      - r\ :sub:`3`
> +      - r\ :sub:`2`
> +      - r\ :sub:`1`
> +      - r\ :sub:`0`
> +    * .. _V4L2-PIX-FMT-RGBA32:
> +
> +      - ``V4L2_PIX_FMT_RGBA32``
> +      - 'AB24'
> +
> +      - r\ :sub:`7`
> +      - r\ :sub:`6`
> +      - r\ :sub:`5`
> +      - r\ :sub:`4`
> +      - r\ :sub:`3`
> +      - r\ :sub:`2`
> +      - r\ :sub:`1`
> +      - r\ :sub:`0`
> +
> +      - g\ :sub:`7`
> +      - g\ :sub:`6`
> +      - g\ :sub:`5`
> +      - g\ :sub:`4`
> +      - g\ :sub:`3`
> +      - g\ :sub:`2`
> +      - g\ :sub:`1`
> +      - g\ :sub:`0`
> +
> +      - b\ :sub:`7`
> +      - b\ :sub:`6`
> +      - b\ :sub:`5`
> +      - b\ :sub:`4`
> +      - b\ :sub:`3`
> +      - b\ :sub:`2`
> +      - b\ :sub:`1`
> +      - b\ :sub:`0`
> +
> +      - a\ :sub:`7`
> +      - a\ :sub:`6`
> +      - a\ :sub:`5`
> +      - a\ :sub:`4`
> +      - a\ :sub:`3`
> +      - a\ :sub:`2`
> +      - a\ :sub:`1`
> +      - a\ :sub:`0`
> +    * .. _V4L2-PIX-FMT-RGBX32:
> +
> +      - ``V4L2_PIX_FMT_RGBX32``
> +      - 'XB24'
> +
> +      - r\ :sub:`7`
> +      - r\ :sub:`6`
> +      - r\ :sub:`5`
> +      - r\ :sub:`4`
> +      - r\ :sub:`3`
> +      - r\ :sub:`2`
> +      - r\ :sub:`1`
> +      - r\ :sub:`0`
> +
> +      - g\ :sub:`7`
> +      - g\ :sub:`6`
> +      - g\ :sub:`5`
> +      - g\ :sub:`4`
> +      - g\ :sub:`3`
> +      - g\ :sub:`2`
> +      - g\ :sub:`1`
> +      - g\ :sub:`0`
> +
> +      - b\ :sub:`7`
> +      - b\ :sub:`6`
> +      - b\ :sub:`5`
> +      - b\ :sub:`4`
> +      - b\ :sub:`3`
> +      - b\ :sub:`2`
> +      - b\ :sub:`1`
> +      - b\ :sub:`0`
> +
I'm trying to compare these with the existing 32-bit RGB formats in
pixfmt-packed-rgb.rst and I can't get how the orderig of components is
defined.

Ie your definitions here:

        bytes:  B0      B1      B2      B3
BGRA32          A       B       G       R
BGRX32          x       B       G       R
RGBA32          R       G       B       A
RGBX32          R       G       B       x

In the existing documentation:
ABGR32          B       G       R       A
XBGR32          B       G       R       x
ARGB32          A       R       G       B
XRGB32          x       R       G       B

So you're adding two BGR/RGB variations with 'X' or 'A' moved from the
first (for RGB) or last (for BGR) bytes to the last (for RGB) or first
(for BGR) bytes.

I cannot see a clear pattern (it seems RGB is ordered as you read the
components, while BGR is inverted?) so I assume the definition of the
component ordering scheme comes from a standard, does it? A reference
would help checking for errors :)

Thanks
   j

>        -
>        -
>        -
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 1db220da3bcc..4e5222726719 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -528,7 +528,11 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_BGR32   v4l2_fourcc('B', 'G', 'R', '4') /* 32  BGR-8-8-8-8   */
>  #define V4L2_PIX_FMT_ABGR32  v4l2_fourcc('A', 'R', '2', '4') /* 32  BGRA-8-8-8-8  */
>  #define V4L2_PIX_FMT_XBGR32  v4l2_fourcc('X', 'R', '2', '4') /* 32  BGRX-8-8-8-8  */
> +#define V4L2_PIX_FMT_BGRA32  v4l2_fourcc('R', 'A', '2', '4') /* 32  ABGR-8-8-8-8  */
> +#define V4L2_PIX_FMT_BGRX32  v4l2_fourcc('R', 'X', '2', '4') /* 32  XBGR-8-8-8-8  */
>  #define V4L2_PIX_FMT_RGB32   v4l2_fourcc('R', 'G', 'B', '4') /* 32  RGB-8-8-8-8   */
> +#define V4L2_PIX_FMT_RGBA32  v4l2_fourcc('A', 'B', '2', '4') /* 32  RGBA-8-8-8-8  */
> +#define V4L2_PIX_FMT_RGBX32  v4l2_fourcc('X', 'B', '2', '4') /* 32  RGBX-8-8-8-8  */
>  #define V4L2_PIX_FMT_ARGB32  v4l2_fourcc('B', 'A', '2', '4') /* 32  ARGB-8-8-8-8  */
>  #define V4L2_PIX_FMT_XRGB32  v4l2_fourcc('B', 'X', '2', '4') /* 32  XRGB-8-8-8-8  */
>
> --
> Regards,
>
> Laurent Pinchart
>