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Viewing file:     index.js (1.81 KB)      -rw-r--r--

import { isNodePattern } from "@jimp/utils";

/**
 * Creates a circle out of an image.
 * @param {function(Error, Jimp)} options (optional)
 * opacity - opacity of the shadow between 0 and 1
 * size,- of the shadow
 * blur - how blurry the shadow is
 * x- x position of shadow
 * y - y position of shadow
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
export default (() => ({
  shadow() {
    let options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
    let cb = arguments.length > 1 ? arguments[1] : undefined;
    if (typeof options === "function") {
      cb = options;
      options = {};
    }
    const {
      opacity = 0.7,
      size = 1.1,
      x = -25,
      y = 25,
      blur = 5
    } = options;

    // clone the image
    const orig = this.clone();
    const shadow = this.clone();

    // turn all it's pixels black
    shadow.scan(0, 0, shadow.bitmap.width, shadow.bitmap.height, (x, y, idx) => {
      shadow.bitmap.data[idx] = 0x00;
      shadow.bitmap.data[idx + 1] = 0x00;
      shadow.bitmap.data[idx + 2] = 0x00;
      // up the opacity a little,
      shadow.bitmap.data[idx + 3] = shadow.constructor.limit255(shadow.bitmap.data[idx + 3] * opacity);
      this.bitmap.data[idx] = 0x00;
      this.bitmap.data[idx + 1] = 0x00;
      this.bitmap.data[idx + 2] = 0x00;
      this.bitmap.data[idx + 3] = 0x00;
    });

    // enlarge it. This creates a "shadow".
    shadow.resize(shadow.bitmap.width * size, shadow.bitmap.height * size).blur(blur);

    // Then blit the "shadow" onto the background and the image on top of that.
    this.composite(shadow, x, y);
    this.composite(orig, 0, 0);
    if (isNodePattern(cb)) {
      cb.call(this, null, this);
    }
    return this;
  }
}));
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