Function crop

plugins/plugin-crop/src/index.ts:54–85

* Crops the image at a given point to a give size. * * @example * ```ts * import { Jimp } from "jimp"; * * const image = await Jimp.read("test/image.png"); * const cropped = image.crop(150, 100); * ```

(image: I, options: CropOptions)

   * ```
   */
  crop<I extends JimpClass>(image: I, options: CropOptions) {
    let { x, y, w, h } = CropOptionsSchema.parse(options);
    // round input
    x = Math.round(x);
    y = Math.round(y);
    w = Math.round(w);
    h = Math.round(h);

    if (x === 0 && w === image.bitmap.width) {
      // shortcut
      const start = (w * y + x) << 2;
      const end = start + ((h * w) << 2);

      image.bitmap.data = image.bitmap.data.slice(start, end);
    } else {
      const bitmap = Buffer.allocUnsafe(w * h * 4);
      let offset = 0;

      scan(image, x, y, w, h, function (_, __, idx) {
        const data = image.bitmap.data.readUInt32BE(idx);
        bitmap.writeUInt32BE(data, offset);
        offset += 4;
      });

      image.bitmap.data = bitmap;
    }

    image.bitmap.width = w;
    image.bitmap.height = h;

    return image;
  },

  /**
   * Autocrop same color borders from this image.