react-color/es/helpers/checkboard.js

A Collection of Color Pickers from Sketch, Photoshop, Chrome & more

var checkboardCache = {};

export var render = function render(c1, c2, size, serverCanvas) {
  if (typeof document === 'undefined' && !serverCanvas) {
    return null;
  }
  var canvas = serverCanvas ? new serverCanvas() : document.createElement('canvas');
  canvas.width = size * 2;
  canvas.height = size * 2;
  var ctx = canvas.getContext('2d');
  if (!ctx) {
    return null;
  } // If no context can be found, return early.
  ctx.fillStyle = c1;
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  ctx.fillStyle = c2;
  ctx.fillRect(0, 0, size, size);
  ctx.translate(size, size);
  ctx.fillRect(0, 0, size, size);
  return canvas.toDataURL();
};

export var get = function get(c1, c2, size, serverCanvas) {
  var key = c1 + '-' + c2 + '-' + size + (serverCanvas ? '-server' : '');

  if (checkboardCache[key]) {
    return checkboardCache[key];
  }

  var checkboard = render(c1, c2, size, serverCanvas);
  checkboardCache[key] = checkboard;
  return checkboard;
};