Seungha Yang bdc0f177f0 d3d11screencapturesrc: Fix mouse cursor blending
Ignore alpha component of source (mouse cursor texture)
when blending alpha channel, otherwise the background area of source
(which has zeros) will be written to render target. Then it will result
in black rectangle if output texture is converted to premultiplied alpha
texture

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5566>
2023-10-27 16:33:04 +00:00
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