YueWen/node_modules/@jimp/plugin-blit/test/blit.test.js

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

import blit from '../src';

const jimp = configure({ types: [jpeg], plugins: [blit] }, Jimp);
const testDir = getTestDir(__dirname);

describe('Blit over image', function() {
  this.timeout(15000);
  const targetJGD = mkJGD(
    '▴▴▴▴▸▸▸▸',
    '▴▴▴▴▸▸▸▸',
    '▴▴▴▴▸▸▸▸',
    '▴▴▴▴▸▸▸▸',
    '▾▾▾▾◆◆◆◆',
    '▾▾▾▾◆◆◆◆',
    '▾▾▾▾◆◆◆◆',
    '▾▾▾▾◆◆◆◆'
  );
  const srcJGD = mkJGD(
    '□□□□□□',
    '□▥▥▥▥□',
    '□▥■■▥□',
    '□▥■■▥□',
    '□▥▥▥▥□',
    '□□□□□□'
  );

  let targetImg;
  let srcImg; // stores the Jimp instances of the JGD images above.

  before(done => {
    const img1 = jimp.read(targetJGD);
    const img2 = jimp.read(srcJGD);
    Promise.all([img1, img2])
      .then(images => {
        targetImg = images[0];
        srcImg = images[1];
        done();
      })
      .catch(done);
  });

  it('blit on top, with no crop', () => {
    targetImg
      .clone()
      .blit(srcImg, 0, 0)
      .getJGDSync()
      .should.be.sameJGD(
        mkJGD(
          '□□□□□□▸▸',
          '□▥▥▥▥□▸▸',
          '□▥■■▥□▸▸',
          '□▥■■▥□▸▸',
          '□▥▥▥▥□◆◆',
          '□□□□□□◆◆',
          '▾▾▾▾◆◆◆◆',
          '▾▾▾▾◆◆◆◆'
        )
      );
  });

  it('blit on middle, with no crop', () => {
    targetImg
      .clone()
      .blit(srcImg, 1, 1)
      .getJGDSync()
      .should.be.sameJGD(
        mkJGD(
          '▴▴▴▴▸▸▸▸',
          '▴□□□□□□▸',
          '▴□▥▥▥▥□▸',
          '▴□▥■■▥□▸',
          '▾□▥■■▥□◆',
          '▾□▥▥▥▥□◆',
          '▾□□□□□□◆',
          '▾▾▾▾◆◆◆◆'
        )
      );
  });

  it('blit on middle, with x,y crop', () => {
    targetImg
      .clone()
      .blit(srcImg, 2, 2, 1, 1, 5, 5)
      .getJGDSync()
      .should.be.sameJGD(
        mkJGD(
          '▴▴▴▴▸▸▸▸',
          '▴▴▴▴▸▸▸▸',
          '▴▴▥▥▥▥□▸',
          '▴▴▥■■▥□▸',
          '▾▾▥■■▥□◆',
          '▾▾▥▥▥▥□◆',
          '▾▾□□□□□◆',
          '▾▾▾▾◆◆◆◆'
        )
      );
  });

  it('blit on middle, with x,y,w,h crop', () => {
    targetImg
      .clone()
      .blit(srcImg, 2, 2, 1, 1, 4, 4)
      .getJGDSync()
      .should.be.sameJGD(
        mkJGD(
          '▴▴▴▴▸▸▸▸',
          '▴▴▴▴▸▸▸▸',
          '▴▴▥▥▥▥▸▸',
          '▴▴▥■■▥▸▸',
          '▾▾▥■■▥◆◆',
          '▾▾▥▥▥▥◆◆',
          '▾▾▾▾◆◆◆◆',
          '▾▾▾▾◆◆◆◆'
        )
      );
  });

  it('blit partially out, on top-left', () => {
    targetImg
      .clone()
      .blit(srcImg, -1, -1)
      .getJGDSync()
      .should.be.sameJGD(
        mkJGD(
          '▥▥▥▥□▸▸▸',
          '▥■■▥□▸▸▸',
          '▥■■▥□▸▸▸',
          '▥▥▥▥□▸▸▸',
          '□□□□□◆◆◆',
          '▾▾▾▾◆◆◆◆',
          '▾▾▾▾◆◆◆◆',
          '▾▾▾▾◆◆◆◆'
        )
      );
  });

  it('blit partially out, on bottom-right', () => {
    targetImg
      .clone()
      .blit(srcImg, 3, 3)
      .getJGDSync()
      .should.be.sameJGD(
        mkJGD(
          '▴▴▴▴▸▸▸▸',
          '▴▴▴▴▸▸▸▸',
          '▴▴▴▴▸▸▸▸',
          '▴▴▴□□□□□',
          '▾▾▾□▥▥▥▥',
          '▾▾▾□▥■■▥',
          '▾▾▾□▥■■▥',
          '▾▾▾□▥▥▥▥'
        )
      );
  });

  it('blit alpha', async () => {
    const expectedImg = await Jimp.read(testDir + '/images/blit-alpha.png');
    const dice = await Jimp.read(testDir + '/images/dice.png');
    const image = await Jimp.read(testDir + '/images/cops.jpg');

    image
      .blit(dice, 0, 0)
      .bitmap.data.should.be.deepEqual(expectedImg.bitmap.data);
  });

  async function createCat(catNum, len) {
    let imgHeight = 60;

    const butt = await Jimp.read(testDir + '/images/cat_butt.png');
    const head = await Jimp.read(testDir + '/images/cat_head.png');
    const fuzz = await Jimp.read(testDir + '/images/cat_fuzz.png');

    let longCat = len;
    longCat = longCat > 20 ? 20 : longCat;
    longCat = longCat <= 1 ? 1 : longCat;

    const cat =
      Math.floor(catNum * (head.bitmap.height / imgHeight)) * imgHeight;

    const newImage = await Jimp.create(
      butt.bitmap.width + head.bitmap.width + fuzz.bitmap.width * longCat,
      imgHeight,
      0x00000000
    );

    newImage.blit(butt, 0, 0, 0, cat, butt.bitmap.width, imgHeight);
    for (let i = 0; i < longCat; i++) {
      newImage.blit(
        fuzz,
        butt.bitmap.width + fuzz.bitmap.width * i,
        0,
        0,
        cat,
        fuzz.bitmap.width,
        imgHeight
      );
    }

    newImage.blit(
      head,
      butt.bitmap.width + fuzz.bitmap.width * longCat,
      0,
      0,
      cat,
      head.bitmap.width,
      imgHeight
    );

    return newImage;
  }

  it('uses src params correctly', async () => {
    const expectedSmall = await Jimp.read(
      testDir + '/images/cat-results/small-cat.png'
    );
    const small = await createCat(0.3, 1);
    small.bitmap.data.should.be.deepEqual(expectedSmall.bitmap.data);

    const expectedMedium = await Jimp.read(
      testDir + '/images/cat-results/medium-cat.png'
    );
    const medium = await createCat(0.6, 7);
    medium.bitmap.data.should.be.deepEqual(expectedMedium.bitmap.data);

    const expectedLarge = await Jimp.read(
      testDir + '/images/cat-results/large-cat.png'
    );
    const large = await createCat(0.9, 20);
    large.bitmap.data.should.be.deepEqual(expectedLarge.bitmap.data);
  });
});