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Filename : pixelmatch
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#!/usr/bin/env node
/* eslint-disable no-process-exit */

'use strict';

const PNG = require('pngjs').PNG;
const fs = require('fs');
const match = require('../.');

if (process.argv.length < 4) {
    console.log('Usage: pixelmatch image1.png image2.png [diff.png] [threshold] [includeAA]');
    process.exit(64);
}

const [,, img1Path, img2Path, diffPath, threshold, includeAA] = process.argv;
const options = {};
if (threshold !== undefined) options.threshold = +threshold;
if (includeAA !== undefined) options.includeAA = includeAA !== 'false';

const img1 = PNG.sync.read(fs.readFileSync(img1Path));
const img2 = PNG.sync.read(fs.readFileSync(img2Path));

const {width, height} = img1;

if (img2.width !== width || img2.height !== height) {
    console.log(`Image dimensions do not match: ${width}x${height} vs ${img2.width}x${img2.height}`);
    process.exit(65);
}

const diff = diffPath ? new PNG({width, height}) : null;

console.time('matched in');
const diffs = match(img1.data, img2.data, diff ? diff.data : null, width, height, options);
console.timeEnd('matched in');

console.log(`different pixels: ${diffs}`);
console.log(`error: ${Math.round(100 * 100 * diffs / (width * height)) / 100}%`);

if (diff) {
    fs.writeFileSync(diffPath, PNG.sync.write(diff));
}
process.exit(diffs ? 66 : 0);