diff options
| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2014-05-21 19:16:01 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-07-17 12:44:46 -0300 |
| commit | b04ef7c075e8806fa18bc849e32d6a3163150cec (patch) | |
| tree | dc9d14cb94fd01db372066b0259b894a263fad6c /Documentation/DocBook | |
| parent | 977ff0e4fb3460df9f3dd27de92d60786be28645 (diff) | |
[media] DocBook: media: Document ALPHA_COMPONENT control usage on output devices
Extend the V4L2_CID_ALPHA_COMPONENT control for use on output devices,
to set the alpha component value when the output format doesn't have an
alpha channel.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/controls.xml | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index cc0087efc8d2..74f575560f1b 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -408,14 +408,17 @@ to work.</entry> <row id="v4l2-alpha-component"> <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry> <entry>integer</entry> - <entry> Sets the alpha color component on the capture device or on - the capture buffer queue of a mem-to-mem device. When a mem-to-mem - device produces frame format that includes an alpha component + <entry>Sets the alpha color component. When a capture device (or + capture queue of a mem-to-mem device) produces a frame format that + includes an alpha component (e.g. <link linkend="rgb-formats">packed RGB image formats</link>) - and the alpha value is not defined by the mem-to-mem input data - this control lets you select the alpha component value of all - pixels. It is applicable to any pixel format that contains an alpha - component. + and the alpha value is not defined by the device or the mem-to-mem + input data this control lets you select the alpha component value of + all pixels. When an output device (or output queue of a mem-to-mem + device) consumes a frame format that doesn't include an alpha + component and the device supports alpha channel processing this + control lets you set the alpha component value of all pixels for + further processing in the device. </entry> </row> <row> |