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GStreamer multimedia framework
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Thibault Saunier effb593a93 compositor: Add support for crossfade blending 
Crossfading is a bit more complex than just having two pads with the
right keyframes as the blending is not exactly the same.

The difference is in the way we compute the alpha channel, in the case
of crossfading, we have to compute an additive operation between
the destination and the source (factored by the alpha property of both
the input pad alpha property and the crossfading ratio) basically so
that the crossfade result of 2 opaque frames is also fully opaque at any
time in the crossfading process, avoid bleeding through the layer
blending.

Some rationnal can be found in https://phabricator.freedesktop.org/T7773.

https://bugzilla.gnome.org/show_bug.cgi?id=784827
2017-08-03 12:59:43 -04:00
ext/gl glbasemixer: Remove unused negotiated member 2017-05-21 18:31:59 +02:00
gst/compositor compositor: Add support for crossfade blending 2017-08-03 12:59:43 -04:00
gst-libs/gst/video compositor: Add support for crossfade blending 2017-08-03 12:59:43 -04:00
tests/check/elements tests: Test caps using query 2017-05-20 16:21:16 +02:00