@macrostrat/column-components/dist/chroma-js/src/generator/blend.js

React rendering primitives for stratigraphic columns

import "../io/rgb/index.js";
import chroma from "../chroma.js";
const blend = (bottom, top, mode) => {
  if (!blend[mode]) {
    throw new Error("unknown blend mode " + mode);
  }
  return blend[mode](bottom, top);
};
const blend_f = (f) => (bottom, top) => {
  const c0 = chroma(top).rgb();
  const c1 = chroma(bottom).rgb();
  return chroma.rgb(f(c0, c1));
};
const each = (f) => (c0, c1) => {
  const out = [];
  out[0] = f(c0[0], c1[0]);
  out[1] = f(c0[1], c1[1]);
  out[2] = f(c0[2], c1[2]);
  return out;
};
const normal = (a) => a;
const multiply = (a, b) => a * b / 255;
const darken = (a, b) => a > b ? b : a;
const lighten = (a, b) => a > b ? a : b;
const screen = (a, b) => 255 * (1 - (1 - a / 255) * (1 - b / 255));
const overlay = (a, b) => b < 128 ? 2 * a * b / 255 : 255 * (1 - 2 * (1 - a / 255) * (1 - b / 255));
const burn = (a, b) => 255 * (1 - (1 - b / 255) / (a / 255));
const dodge = (a, b) => {
  if (a === 255) return 255;
  a = 255 * (b / 255) / (1 - a / 255);
  return a > 255 ? 255 : a;
};
blend.normal = blend_f(each(normal));
blend.multiply = blend_f(each(multiply));
blend.screen = blend_f(each(screen));
blend.overlay = blend_f(each(overlay));
blend.darken = blend_f(each(darken));
blend.lighten = blend_f(each(lighten));
blend.dodge = blend_f(each(dodge));
blend.burn = blend_f(each(burn));
export {
  blend as default
};
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