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Viewing file:     index.js (1.11 KB)      -rw-r--r--

import JPEG from "jpeg-js";
import { throwError, isNodePattern } from "@jimp/utils";

const MIME_TYPE = "image/jpeg";

export default () => ({
  mime: { [MIME_TYPE]: ["jpeg", "jpg", "jpe"] },

  constants: {
    MIME_JPEG: MIME_TYPE,
  },

  decoders: {
    [MIME_TYPE]: JPEG.decode,
  },

  encoders: {
    [MIME_TYPE]: (image) => JPEG.encode(image.bitmap, image._quality).data,
  },

  class: {
    // The quality to be used when saving JPEG images
    _quality: 100,
    /**
     * Sets the quality of the image when saving as JPEG format (default is 100)
     * @param {number} n The quality to use 0-100
     * @param {function(Error, Jimp)} cb (optional) a callback for when complete
     * @returns {Jimp} this for chaining of methods
     */
    quality(n, cb) {
      if (typeof n !== "number") {
        return throwError.call(this, "n must be a number", cb);
      }

      if (n < 0 || n > 100) {
        return throwError.call(this, "n must be a number 0 - 100", cb);
      }

      this._quality = Math.round(n);

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

      return this;
    },
  },
});