@macrostrat/column-components/dist/chroma-js/src/ops/premultiply.js

React rendering primitives for stratigraphic columns

import Color from "../Color.js";
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");
  }
};
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