FT_INVCLR()
 Get the inverse of a color
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 Syntax

      FT_INVCLR( [ <cDsrdColor> ] ) -> cColor

 Arguments

     <cDsrdColor> is the color to get the inverse of.  Defaults to
     current color.

 Returns

     The inverse of the passed color.

 Description

     This function inverts a passed color (in the Clipper format: ??/??),
     e.g., "W/N" is converted to "N/W".

 Examples

     cInverse := FT_INVCLR()            // Get Inverse of Current Color
     cInvErr  := FT_INVCLR( cErrColor ) // Get Inverse of cErrorColor

 Source: INVCLR.PRG

 Author: David Husnian