Nirbheek Chauhan 8f1edb69f4 compositor: Skip pads that are completely obscured by a higher zorder pad ... For each frame, compare the frame boundaries, check if the format contains an alpha channel, check opacity, and skip the frame if it's going to be completely overwritten by a higher zorder frame. The check is O(n^2), but that doesn't matter here because the number of sinkpads is small. More can be done to avoid needless drawing, but this covers the majority of cases. See TODOs. Ideally, a reverse painter's algorithm should be used for optimal drawing, but memcpy during compositing is small compared to the CPU used for frame conversion on each pad. https://bugzilla.gnome.org/show_bug.cgi?id=746147		2015-05-01 10:56:32 +01:00
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compositor	compositor: Skip pads that are completely obscured by a higher zorder pad	2015-05-01 10:56:32 +01:00