Emmanuele Bassi 94ce747f83 actor: Allow querying the paint volume
An actor has an implicit "paint volume", that is the volume in 3D space
occupied when painting itself.

The paint volume is defined as a cuboid with the origin placed at the
top-left corner of the actor; the size of the cuboid is given by three
vectors: width, height and depth.

ClutterActor provides API to convert the paint volume into a 2D box in
screen coordinates, to compute the on-screen area that an actor will
occupy when painted.

Actors can override the default implementation of the get_paint_volume()
virtual function to provide a different volume.
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