openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[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>
This commit is contained in:
Laurent Pinchart 2014-05-21 19:16:01 -03:00 committed by Mauro Carvalho Chehab
parent 977ff0e4fb
commit b04ef7c075
1 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/DocBook/media/v4l/controls.xml
View File

@ -408,14 +408,17 @@ to work.</entry>
<row id="v4l2-alpha-component"> <row id="v4l2-alpha-component">
<entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry> <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry>
<entry>integer</entry> <entry>integer</entry>
<entry> Sets the alpha color component on the capture device or on <entry>Sets the alpha color component. When a capture device (or
the capture buffer queue of a mem-to-mem device. When a mem-to-mem capture queue of a mem-to-mem device) produces a frame format that
device produces frame format that includes an alpha component includes an alpha component
(e.g. <link linkend="rgb-formats">packed RGB image formats</link>) (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 and the alpha value is not defined by the device or the mem-to-mem
this control lets you select the alpha component value of all input data this control lets you select the alpha component value of
pixels. It is applicable to any pixel format that contains an alpha all pixels. When an output device (or output queue of a mem-to-mem
component. 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> </entry>
</row> </row>
<row> <row>