YueWen/node_modules/@jimp/jpeg/test/jpeg.test.js

import { Jimp, getTestDir } from '@jimp/test-utils';
import configure from '@jimp/custom';

import jpeg from '../src';

const jimp = configure({ types: [jpeg] }, Jimp);

describe('JPEG', () => {
  const imagesDir = getTestDir(__dirname) + '/images';

  it('load JPG', async () => {
    const image = await jimp.read(imagesDir + '/cops.jpg');

    image.getPixelColor(10, 10).should.be.equal(0x3f4a02ff);
    image.getPixelColor(220, 190).should.be.equal(0x5d94b6ff);
    image.getPixelColor(350, 130).should.be.equal(0xdf7944ff);
  });

  it('load JPG with fill bytes', async () => {
    const image = await jimp.read(imagesDir + '/fillbytes.jpg');

    image.getPixelColor(10, 10).should.be.equal(0xaeb8c3ff);
    image.getPixelColor(220, 190).should.be.equal(0x262b21ff);
    image.getPixelColor(350, 130).should.be.equal(0x4e5d30ff);
  });

  it('export JPG', async () => {
    const image = await jimp.read({
      width: 3,
      height: 3,
      data: [
        0xff0000ff,
        0xff0080ff,
        0xff00ffff,
        0xff0080ff,
        0xff00ffff,
        0x8000ffff,
        0xff00ffff,
        0x8000ffff,
        0x0000ffff
      ]
    });
    image.quality(50);
    const buffer = await image.getBufferAsync('image/jpeg');

    buffer.toString().should.match(/^.{3,9}JFIF\u0000/);
  });
});