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setwritemode
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The setwritemode function sets the current logical write mode,
which is used when drawing lines with the lineto, polygon, and
rectangle functions.
The <action> argument defines the write mode. The possible values
are $GAND, $GOR, $GPRESET, $GPSET, and $GXOR.
Return Value
The function returns the previous write mode if successful, or -1
if it fails.
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