linux-kernel - Re: [PATCH v4 2/6] [media] extended-controls.rst: add PorterDuff mode control

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Date:   Mon, 31 Jul 2017 18:07:17 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Jacob Chen <jacob-chen@...wrt.com>,
        linux-rockchip@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, heiko@...ech.de, robh+dt@...nel.org,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        laurent.pinchart+renesas@...asonboard.com, hans.verkuil@...co.com,
        tfiga@...omium.org, nicolas@...fresne.ca
Subject: Re: [PATCH v4 2/6] [media] extended-controls.rst: add PorterDuff mode
 control

On 07/31/2017 05:32 PM, Jacob Chen wrote:
> PorterDuff mode control are used to determine
> how two images are combined.
> 
> Signed-off-by: Jacob Chen <jacob-chen@...wrt.com>
> ---
>  Documentation/media/uapi/v4l/extended-controls.rst | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
> index abb1057..f9c93bb 100644
> --- a/Documentation/media/uapi/v4l/extended-controls.rst
> +++ b/Documentation/media/uapi/v4l/extended-controls.rst
> @@ -3021,6 +3021,10 @@ Image Process Control IDs
>      The video deinterlacing mode (such as Bob, Weave, ...). The menu items are
>      driver specific and are documented in :ref:`v4l-drivers`.
>  
> +``V4L2_CID_PORTER_DUFF_MODE (menu)``
> +    The PorterDuff blend modes. PorterDuff is way to overlay, combine and
> +    trim images as if they were pieces of cardboard, device could use to
> +    determine how two images are combined.

A little rewrite:

    The PorterDuff blend modes. PorterDuff is a method to overlay, combine and
    trim images as if they were pieces of cardboard. The device uses this to
    determine how two images are combined.

Also add a link to the same android article that you pointed to in the header.

Regards,

	Hans

>  
>  .. _dv-controls:
>  
>