Georges Basile Stavracas Neto 5794871977 clutter/offscreen-effect: Add new create_pipeline() vfunc
The most annoying aspect of ClutterOffscreenEffect right now, and
the reason for all its subclasses to override pre-paint, is that
the pipeline creation isn't under subclasses' control. That means
all subclasses must ask ClutterOffscreenEffect to run pre-paint
and create the pipeline, then they all create their own pipelines
to paint.

To reduce this complexity, add a new create_pipeline() vfunc to
ClutterOffscreenEffect. Next commits will port effects to use this
new vfunc.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1355>
2020-12-15 10:36:34 -03:00
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