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13.5.3 Control over combining of drawn graphics

The new graphics state parameter compositing-mode controls the way that new drawings are combined with the existing value in the target of the drawing to generate the result.

Two values for compositing-mode are supported on Microsoft Windows, Cocoa and GTK+.

A number of other compositing-mode values are supported on later versions of Cocoa and GTK+.

compositing-mode is only supported in with drawing-mode :quality .

For further details and examples see the manual page for gp:graphics-state .

LispWorks Release Notes and Installation Guide - 23 Dec 2011