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Viewing file:     test.js (1.75 KB)      -rw-r--r--

'use strict';

var PNG = require('pngjs').PNG,
    fs = require('fs'),
    test = require('tap').test,
    path = require('path'),
    match = require('../.');

diffTest('1a', '1b', '1diff', 0.05, false, 143);
diffTest('2a', '2b', '2diff', 0.05, false, 12439);
diffTest('3a', '3b', '3diff', 0.05, false, 212);
diffTest('4a', '4b', '4diff', 0.05, false, 36089);

function diffTest(imgPath1, imgPath2, diffPath, threshold, includeAA, expectedMismatch) {
    var name = 'comparing ' + imgPath1 + ' to ' + imgPath2 +
            ', threshold: ' + threshold + ', includeAA: ' + includeAA;

    test(name, function (t) {
        var img1 = readImage(imgPath1, function () {
            var img2 = readImage(imgPath2, function () {
                var expectedDiff = readImage(diffPath, function () {
                    var diff = new PNG({width: img1.width, height: img1.height});

                    var mismatch = match(img1.data, img2.data, diff.data, diff.width, diff.height, {
                        threshold: threshold,
                        includeAA: includeAA
                    });

                    var mismatch2 = match(img1.data, img2.data, null, diff.width, diff.height, {
                        threshold: threshold,
                        includeAA: includeAA
                    });

                    t.same(diff.data, expectedDiff.data, 'diff image');
                    t.same(mismatch, expectedMismatch, 'number of mismatched pixels');
                    t.same(mismatch, mismatch2, 'number of mismatched pixels');

                    t.end();
                });
            });
        });
    });
}

function readImage(name, done) {
    return fs.createReadStream(path.join(__dirname, '/fixtures/' + name + '.png')).pipe(new PNG()).on('parsed', done);
}