The sRGB gamut expressed in CIE xyY:

	Chromaticity	Red       Green	    Blue      White point
	x 		0.6400    0.3000    0.1500    0.31271
	y 		0.3300    0.6000    0.0600    0.32902
	Y 		0.212656  0.715158  0.072186  1.0000

A function is needed that given the values (sans Y) of a
monitor's gamut, converts from sRGB to the monitor's RGB.
An inverse function of this is also needed.