Function scan

packages/utils/src/index.ts:29–81

(
  image: I,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  xArg: number | ((x: number, y: number, idx: number) => any),
  yArg?: number,
  wArg?: number,
  hArg?: number,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  cbArg?: (x: number, y: number, idx: number) => any
)

  cb: (x: number, y: number, idx: number) => any
): I;
export function scan<I extends { bitmap: Bitmap }>(
  image: I,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  xArg: number | ((x: number, y: number, idx: number) => any),
  yArg?: number,
  wArg?: number,
  hArg?: number,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  cbArg?: (x: number, y: number, idx: number) => any
): I {
  let x: number;
  let y: number;
  let w: number;
  let h: number;
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  let cb: (x: number, y: number, idx: number) => any;

  if (typeof xArg === "function") {
    cb = xArg;
    x = 0;
    y = 0;
    w = image.bitmap.width;
    h = image.bitmap.height;
  } else {
    x = xArg;
    if (typeof yArg !== "number") throw new Error("y must be a number");
    y = yArg;
    if (typeof wArg !== "number") throw new Error("w must be a number");
    w = wArg;
    if (typeof hArg !== "number") throw new Error("h must be a number");
    h = hArg;
    if (typeof cbArg !== "function") throw new Error("cb must be a function");
    cb = cbArg;
  }

  // round input
  x = Math.round(x);
  y = Math.round(y);
  w = Math.round(w);
  h = Math.round(h);

  const bound = cb.bind(image);

  for (let _y = y; _y < y + h; _y++) {
    for (let _x = x; _x < x + w; _x++) {
      const idx = (image.bitmap.width * _y + _x) << 2;
      // Bind the images so this.bitmap works
      bound(_x, _y, idx);
    }
  }

  return image;
}

export function* scanIterator<I extends JimpClass>(
  image: I,