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Filename : index.js

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export function isNodePattern(cb) {
  if (typeof cb === "undefined") {
    return false;
  }

  if (typeof cb !== "function") {
    throw new TypeError("Callback must be a function");
  }

  return true;
}

export function throwError(error, cb) {
  if (typeof error === "string") {
    error = new Error(error);
  }

  if (typeof cb === "function") {
    return cb.call(this, error);
  }

  throw error;
}

export function scan(image, x, y, w, h, f) {
  // round input
  x = Math.round(x);
  y = Math.round(y);
  w = Math.round(w);
  h = Math.round(h);

  for (let _y = y; _y < y + h; _y++) {
    for (let _x = x; _x < x + w; _x++) {
      const idx = (image.bitmap.width * _y + _x) << 2;
      f.call(image, _x, _y, idx);
    }
  }

  return image;
}

export function* scanIterator(image, x, y, w, h) {
  // round input
  x = Math.round(x);
  y = Math.round(y);
  w = Math.round(w);
  h = Math.round(h);

  for (let _y = y; _y < y + h; _y++) {
    for (let _x = x; _x < x + w; _x++) {
      const idx = (image.bitmap.width * _y + _x) << 2;
      yield { x: _x, y: _y, idx, image };
    }
  }
}