NAME
	ScalerDiv -- Get the scaling result that BitMapScale would. (V36)

   SYNOPSIS
	result = ScalerDiv(factor, numerator, denominator)
	D0                 D0      D1         D2

	UWORD ScalerDiv(UWORD, UWORD, UWORD);

   FUNCTION
	Calculate the expression (factor*numerator/denominator) such
	that the result is the same as the width of the destination
	result of BitMapScale when the factor here is the width of
	the source, and the numerator and denominator are the
	XDestFactor and XSrcFactor for BitMapScale.

   INPUTS
	factor                 - a number in the range 0..16383
	numerator, denominator - numbers in the range 1..16383

   RESULT
	this returns factor*numerator/denominator