src/images/smaa/utils/SMAASearchImageData.js
function bilinear(e) {

	const a = lerp(e[0], e[1], 1.0 - 0.25);
	const b = lerp(e[2], e[3], 1.0 - 0.25);

	return lerp(a, b, 1.0 - 0.125);

}
function bilinear(e) {

	const a = lerp(e[0], e[1], 1.0 - 0.25);
	const b = lerp(e[2], e[3], 1.0 - 0.25);

	return lerp(a, b, 1.0 - 0.125);

}
Calculates the bilinear fetch for a certain edge combination.

e[0]       e[1]

x <-------- Sample Position: (-0.25, -0.125)
e[2]       e[3] <--- Current Pixel [3]: (0.0, 0.0)

@private
@param {Number[]} e - The edge combination.
@return {Number} The interpolated value.