Commit a4834cef authored by Vaibhav Hiremath's avatar Vaibhav Hiremath Committed by Mauro Carvalho Chehab
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Signed-off-by: default avatarVaibhav Hiremath <>
Signed-off-by: default avatarHans Verkuil <>
Signed-off-by: default avatarMauro Carvalho Chehab <>
parent d8008562
......@@ -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>
<entry>The device supports Source Chroma-keying. Framebuffer pixels
with the chroma-key colors are replaced by video pixels, which is exactly opposite of
......@@ -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>
<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>
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