[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:
parent
977ff0e4fb
commit
b04ef7c075
|
@ -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>
|
||||
|
|
Loading…
Reference in a new issue