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Commit a4834cef authored by Vaibhav Hiremath's avatar Vaibhav Hiremath Committed by Mauro Carvalho Chehab
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V4L/DVB (13471): v4l2 doc: Added FBUF_CAP_SRC_CHROMAKEY/FLAG_SRC_CHROMAKEY 



Signed-off-by: default avatarVaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent d8008562

Documentation/DocBook/v4l/vidioc-g-fbuf.xml

+17 −0
Original line number Diff line number Diff line
@@ -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>