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manpage: document background transparency

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--alpha=yes doesn't affect only transparent videos and images, but also
the background. I spent time researching how to implement transparent
backgrounds and had no idea that they already worked at least on
Wayland.

Background transparency will work on X11 when
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2376 is
merged. It doesn't work on Windows. No idea about macOS. Either way,
this paragraph already says that it only works on certain environments
twice.

References #6590
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Guido Cella 2020-12-05 09:39:10 +01:00 committed by Dudemanguy
parent d4bf179e78
commit 6aa7dbdb84
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14
DOCS/man/options.rst
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@ -6376,13 +6376,13 @@ The following video options are currently all specific to ``--vo=gpu`` and
black).
yes
Try to create a framebuffer with alpha component. This only makes sense
if the video contains alpha information (which is extremely rare). May
not be supported on all platforms. If alpha framebuffers are
unavailable, it silently falls back on a normal framebuffer. Note that
if you set the ``--fbo-format`` option to a non-default value, a
format with alpha must be specified, or this won't work.
Whether this really works depends on the windowing system and desktop
environment.
if the video contains alpha information (which is extremely rare) or if
you make the background color transparent. May not be supported on all
platforms. If alpha framebuffers are unavailable, it silently falls
back on a normal framebuffer. Note that if you set the ``--fbo-format``
option to a non-default value, a format with alpha must be specified,
or this won't work. Whether this really works depends on the windowing
system and desktop environment.
no
Ignore alpha component.