Georges Basile Stavracas Neto f411834d42 Introduce ClutterPickStack
ClutterPickStack is a new boxed type that stores the vertices
and clip rectangles. It is meant to be a byproduct of picking,
and takes over most of what ClutterStage currently does.

It introduces a 'seal' system, inspired by MetaKmsUpdate. After
the pick operation is done, and the rectangles are collected,
the pick stack is sealed, and is not allowed to be externally
modified anymore. Internally, it still can invalidate pick
records when an actor is destroyed.

For now, it handles both the clip rectangles, and the matrix
stack, separatedly. Future commits will rearrange this.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1509
2020-10-26 09:56:42 -03:00
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2020-10-26 09:56:42 -03:00