Tests whether a port does quality drawing.
A graphics port.
The generic function
returns true if the graphics port
does quality drawing.
A port does quality drawing if both
1. it was not made with
2. the underlying library supports quality drawing.
Microsoft Windows and Cocoa always support quality drawing, GTK+ supports it from version 2.8 and greater, but Motif never supports it.
Section "Drawing mode and anti-aliasing" in the
CAPI User Guide
CAPI Reference Manual - 15 Dec 2011