const Color = require('../Color');
Color.prototype.premultiply = function(mutate=false) {
const rgb = this._rgb;
const a = rgb[3];
if (mutate) {
this._rgb = [rgb[0]*a, rgb[1]*a, rgb[2]*a, a];
return this;
} else {
return new Color([rgb[0]*a, rgb[1]*a, rgb[2]*a, a], 'rgb');
}
}