server/node_modules/@jimp/utils/README.md

<div align="center">
  <img width="200" height="200"
    src="https://s3.amazonaws.com/pix.iemoji.com/images/emoji/apple/ios-11/256/crayon.png">
  <h1>@jimp/utils</h1>
  <p>Utils for jimp extensions.</p>
</div>

## Available Methods

### isNodePattern

Determines if function was passed an node callback.

```js
if (isNodePattern(cb)) {
  cb.call(this, null, this);
}
```

### throwError

Either throws the error or calls the callback with the error.

```js
if (/* check for error */) {
  return throwError.call(this, 'someError', cb);
}
```

### scan

Scans through a region of the bitmap, calling a function for each pixel.

```js
function removeRed(image) {
  return scan(
    image,
    0,
    0,
    image.bitmap.width,
    image.bitmap.height,
    function (x, y, index) {
      const red = this.bitmap.data[index + 0];
      const green = this.bitmap.data[index + 1];
      const blue = this.bitmap.data[index + 2];
      const alpha = this.bitmap.data[index + 3];

      this.bitmap.data[index + 0] = 0;
      this.bitmap.data[index + 1] = green;
      this.bitmap.data[index + 2] = blue;
      this.bitmap.data[index + 3] = alpha;
    }
  );
}
```

### scanIterator

It's possible to make an iterator scan with a `for ... of`, if you want to `break` the scan before it reaches the end, but note, that this iterator has a huge performance implication:

```js
for (const { x, y, idx, image } of scanIterator(
  image,
  0,
  0,
  image.bitmap.width,
  image.bitmap.height
)) {
}
```