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V4L/DVB (13471): v4l2 doc: Added FBUF_CAP_SRC_CHROMAKEY/FLAG_SRC_CHROMAKEY

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Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Vaibhav Hiremath 2009-11-10 13:14:51 -03:00 committed by Mauro Carvalho Chehab
parent d800856237
commit a4834cef18
1 changed files with 17 additions and 0 deletions
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17
Documentation/DocBook/v4l/vidioc-g-fbuf.xml
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@ -336,6 +336,13 @@ alpha value. Alpha blending makes no sense for destructive overlays.</entry>
inverted alpha channel of the framebuffer or VGA signal. Alpha
blending makes no sense for destructive overlays.</entry>
</row>
<row>
<entry><constant>V4L2_FBUF_CAP_SRC_CHROMAKEY</constant></entry>
<entry>0x0080</entry>
<entry>The device supports Source Chroma-keying. Framebuffer pixels
with the chroma-key colors are replaced by video pixels, which is exactly opposite of
<constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry>
</row>
</tbody>
</tgroup>
</table>
@ -411,6 +418,16 @@ images, but with an inverted alpha value. The blend function is:
output = framebuffer pixel * (1 - alpha) + video pixel * alpha. The
actual alpha depth depends on the framebuffer pixel format.</entry>
</row>
<row>
<entry><constant>V4L2_FBUF_FLAG_SRC_CHROMAKEY</constant></entry>
<entry>0x0040</entry>
<entry>Use source chroma-keying. The source chroma-key color is
determined by the <structfield>chromakey</structfield> field of
&v4l2-window; and negotiated with the &VIDIOC-S-FMT; ioctl, see <xref
linkend="overlay" /> and <xref linkend="osd" />.
Both chroma-keying are mutual exclusive to each other, so same
<structfield>chromakey</structfield> field of &v4l2-window; is being used.</entry>
</row>
</tbody>
</tgroup>
</table>