diff options
| author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2011-11-14 08:48:18 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-12-30 14:05:08 -0200 |
| commit | cc1d327232759647ea56725eab1c6b16c92d52fa (patch) | |
| tree | c929516390d3aade90f4a87f29ceaa05be47aa6a /Documentation/DocBook/media | |
| parent | b4d48c942c17ce3d3a330ad91e109e522bc97378 (diff) | |
| download | lwn-cc1d327232759647ea56725eab1c6b16c92d52fa.tar.gz lwn-cc1d327232759647ea56725eab1c6b16c92d52fa.zip | |
[media] v4l: Add new alpha component control
The V4L2_CID_ALPHA_COMPONENT control is intended for the video capture
or memory-to-memory devices that are capable of setting up the per-pixel
alpha component to some arbitrary value. It allows to set the alpha
component for all pixels to an arbitrary value.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/media')
| -rw-r--r-- | Documentation/DocBook/media/v4l/compat.xml | 11 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/controls.xml | 25 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml | 7 |
3 files changed, 35 insertions, 8 deletions
diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml index 8b44a43f4542..12ba26262d32 100644 --- a/Documentation/DocBook/media/v4l/compat.xml +++ b/Documentation/DocBook/media/v4l/compat.xml @@ -2379,6 +2379,17 @@ that used it. It was originally scheduled for removal in 2.6.35. </orderedlist> </section> + <section> + <title>V4L2 in Linux 3.3</title> + <orderedlist> + <listitem> + <para>Added <constant>V4L2_CID_ALPHA_COMPONENT</constant> control + to the <link linkend="control">User controls class</link>. + </para> + </listitem> + </orderedlist> + </section> + <section id="other"> <title>Relation of V4L2 to other Linux multimedia APIs</title> diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index c0422c622337..a1be37897ad7 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -324,12 +324,6 @@ minimum value disables backlight compensation.</entry> (usually a microscope).</entry> </row> <row> - <entry><constant>V4L2_CID_LASTP1</constant></entry> - <entry></entry> - <entry>End of the predefined control IDs (currently -<constant>V4L2_CID_ILLUMINATORS_2</constant> + 1).</entry> - </row> - <row> <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry> <entry>integer</entry> <entry>This is a read-only control that can be read by the application @@ -345,6 +339,25 @@ and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS. The value is the minimum number of OUTPUT buffers that is necessary for hardware to work.</entry> </row> + <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 + (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. + </entry> + </row> + <row> + <entry><constant>V4L2_CID_LASTP1</constant></entry> + <entry></entry> + <entry>End of the predefined control IDs (currently + <constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry> + </row> <row> <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry> <entry></entry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml index ba56536622f2..166c8d65e4f7 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml @@ -428,8 +428,11 @@ colorspace <constant>V4L2_COLORSPACE_SRGB</constant>.</para> <para>Bit 7 is the most significant bit. The value of a = alpha bits is undefined when reading from the driver, ignored when writing to the driver, except when alpha blending has been negotiated for a -<link linkend="overlay">Video Overlay</link> or <link -linkend="osd">Video Output Overlay</link>.</para> +<link linkend="overlay">Video Overlay</link> or <link linkend="osd"> +Video Output Overlay</link> or when alpha component has been configured +for a <link linkend="capture">Video Capture</link> by means of <link +linkend="v4l2-alpha-component"> <constant>V4L2_CID_ALPHA_COMPONENT +</constant> </link> control.</para> <example> <title><constant>V4L2_PIX_FMT_BGR24</constant> 4 × 4 pixel |