benchmark for pixelmatch

benchmark.js

const fs = require('fs');
const path = require('path');
const Benchmark = require('benchmark');
const suite = new Benchmark.Suite;
const PNG = require('pngjs').PNG,
    matchAfter = require('./'),
    matchBefore = require('./index.1.js');

const img1 = readImage(process.argv[2]);
const img2 = readImage(process.argv[3]);
const diff = new PNG({width: img1.width, height: img1.height});

const array1 = randomizeArray(150*150*4);
const array2 = randomizeArray(150*150*4);

suite
  .add('before # Buffer(includeDiffOnDataEquality=true)', function() {
    const mismatch = matchBefore(img1.data, img2.data, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: true
    });
  })
  .add('after # Buffer(includeDiffOnDataEquality=true)', function() {
    const mismatch = matchAfter(img1.data, img2.data, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: true
    });
  })
  .add('before # Buffer(includeDiffOnDataEquality=false)', function() {
    const mismatch = matchBefore(img1.data, img2.data, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: false
    });
  })
  .add('after # Buffer(includeDiffOnDataEquality=false)', function() {
    const mismatch = matchAfter(img1.data, img2.data, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: false
    });
  })
  .add('before # identical Arrays (includeDiffOnDataEquality=false)', function() {
    const mismatch = matchBefore(array1, array1, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: false
    });
  })
  .add('after # identical Arrays (includeDiffOnDataEquality=false)', function() {
    const mismatch = matchAfter(array1, array1, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: false
    });
  })
  .add('before # identical Arrays (includeDiffOnDataEquality=true)', function() {
    const mismatch = matchBefore(array1, array1, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: true
    });
  })
  .add('after # identical Arrays (includeDiffOnDataEquality=true)', function() {
    const mismatch = matchAfter(array1, array1, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: true
    });
  })
  .add('before # different Arrays', function() {
    const mismatch = matchBefore(array1, array2, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: false
    });
  })
  .add('after # different Arrays', function() {
    const mismatch = matchAfter(array1, array2, diff.data, diff.width, diff.height, {
        includeDiffOnDataEquality: false
    });
  })

  .on('cycle', function(event) {
    console.log(String(event.target));
  }).
  on('complete', function() {
    console.log('Fastest is ' + this.filter('fastest').map('name'));
  }).
  run();



function readImage(name) {
    const data = fs.readFileSync(path.join(__dirname, 'test/fixtures/' + name + '.png'));
    return PNG.sync.read(data);
}

function randomizeArray(length) {
    const data = [];
    for (let i = 0; i < length; i++) {
        const randomNumber = Math.floor(Math.random()*256);
        data.push(randomNumber);
    }
    return data;
}