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Commit b04ef7c0 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Mauro Carvalho Chehab
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[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: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 977ff0e4

Documentation/DocBook/media/v4l/controls.xml

+10 −7
Original line number Diff line number Diff line
@@ -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>