4 commits

Author	SHA1	Message	Date
Sebastian Dröge	e87fa73e60	compositor: Implement different operators via per-pad property ... This removes the crossfade-ratio property and replaces it with an operator property. Currently this implements the following operators: - SOURCE: Copy over the source and don't look at the destination - OVER: Default blending of the source over the destination - ADD: Like OVER but simply adding the alpha instead See the example for how to implement crossfading with this. https://bugzilla.gnome.org/show_bug.cgi?id=797169	2018-10-28 17:13:26 +00:00
Sebastian Dröge	c41439d16f	compositor: Remove extra header for the pad declaration ... There's no reason for having this separate apart from making things less discoverable.	2018-10-27 13:59:57 +01:00
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
Mathieu Duponchelle	75c71741a2	compositor: Add a new compositor based on the new GstVideoAggregator base class ... It is a replacement for videomixer with a similare API Co-Authored by: Thibault Saunier <tsaunier@gnome.org> https://bugzilla.gnome.org/show_bug.cgi?id=731919	2014-06-20 19:53:33 +02:00