sk(), GrSetLineMaskSys(), GrSetLineMaskCustom(), GrGetLineMask(), GrSetTextMaskSys(), GrSetTextMaskCustom(), GrGetTextMask()</PRE>
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Masks are the pixellated equivalent of hatch patterns. Instead of specifying a set of dashed lines, the program uses an 8x8 bitmap array which will be tiled. The graphics system provides a number of standard mask patterns, including 65 percentage masks (for achieving, e.g., a 50% fill) and several shape patterns. It's simple to ask that the inverse of a system pattern be use