with-clipping-box

Arguments: (stream box) &body body

Sets the clipping box for stream to box for the evaluation of body, and then restores the clipping box to its original value. unwind-protect is used to ensure that the clipping box is restored. See clipping-box.

box should either be a box (see make-box) to establish clipping, or else nil to remove all clipping. stream should be a cg-stream.

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Created 2012.5.30.