| From dbd016c0b6e5342227acb9425ef0ef00199b5ba0 Mon Sep 17 00:00:00 2001 |
| From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> |
| Date: Thu, 22 May 2014 00:16:01 +0200 |
| Subject: 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> |
| (cherry picked from commit e632d2f4e25c574a29b269f9f4b0cef2995e402d) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| Documentation/DocBook/media/v4l/controls.xml | 17 ++++++++++------- |
| 1 file changed, 10 insertions(+), 7 deletions(-) |
| |
| diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml |
| index a5a3188e5af7..066800dcb123 100644 |
| --- a/Documentation/DocBook/media/v4l/controls.xml |
| +++ b/Documentation/DocBook/media/v4l/controls.xml |
| @@ -398,14 +398,17 @@ 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> |
| -- |
| 2.1.2 |
| |
