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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.getComparator = getComparator;
var _utilsBundle = require("../utilsBundle");
var _compare = require("../image_tools/compare");
/**
* Copyright 2017 Google Inc. All rights reserved.
* Modifications copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const pixelmatch = require('../third_party/pixelmatch');
const {
diff_match_patch,
DIFF_INSERT,
DIFF_DELETE,
DIFF_EQUAL
} = require('../third_party/diff_match_patch');
function getComparator(mimeType) {
if (mimeType === 'image/png') return compareImages.bind(null, 'image/png');
if (mimeType === 'image/jpeg') return compareImages.bind(null, 'image/jpeg');
if (mimeType === 'text/plain') return compareText;
return compareBuffersOrStrings;
}
const JPEG_JS_MAX_BUFFER_SIZE_IN_MB = 5 * 1024; // ~5 GB
function compareBuffersOrStrings(actualBuffer, expectedBuffer) {
if (typeof actualBuffer === 'string') return compareText(actualBuffer, expectedBuffer);
if (!actualBuffer || !(actualBuffer instanceof Buffer)) return {
errorMessage: 'Actual result should be a Buffer or a string.'
};
if (Buffer.compare(actualBuffer, expectedBuffer)) return {
errorMessage: 'Buffers differ'
};
return null;
}
function compareImages(mimeType, actualBuffer, expectedBuffer, options = {}) {
var _options$_comparator, _ref;
if (!actualBuffer || !(actualBuffer instanceof Buffer)) return {
errorMessage: 'Actual result should be a Buffer.'
};
let actual = mimeType === 'image/png' ? _utilsBundle.PNG.sync.read(actualBuffer) : _utilsBundle.jpegjs.decode(actualBuffer, {
maxMemoryUsageInMB: JPEG_JS_MAX_BUFFER_SIZE_IN_MB
});
let expected = mimeType === 'image/png' ? _utilsBundle.PNG.sync.read(expectedBuffer) : _utilsBundle.jpegjs.decode(expectedBuffer, {
maxMemoryUsageInMB: JPEG_JS_MAX_BUFFER_SIZE_IN_MB
});
const size = {
width: Math.max(expected.width, actual.width),
height: Math.max(expected.height, actual.height)
};
let sizesMismatchError = '';
if (expected.width !== actual.width || expected.height !== actual.height) {
sizesMismatchError = `Expected an image ${expected.width}px by ${expected.height}px, received ${actual.width}px by ${actual.height}px. `;
actual = resizeImage(actual, size);
expected = resizeImage(expected, size);
}
const diff = new _utilsBundle.PNG({
width: size.width,
height: size.height
});
let count;
if (options._comparator === 'ssim-cie94') {
count = (0, _compare.compare)(expected.data, actual.data, diff.data, size.width, size.height, {
// All ΔE* formulae are originally designed to have the difference of 1.0 stand for a "just noticeable difference" (JND).
// See https://en.wikipedia.org/wiki/Color_difference#CIELAB_%CE%94E*
maxColorDeltaE94: 1.0
});
} else if (((_options$_comparator = options._comparator) !== null && _options$_comparator !== void 0 ? _options$_comparator : 'pixelmatch') === 'pixelmatch') {
var _options$threshold;
count = pixelmatch(expected.data, actual.data, diff.data, size.width, size.height, {
threshold: (_options$threshold = options.threshold) !== null && _options$threshold !== void 0 ? _options$threshold : 0.2
});
} else {
throw new Error(`Configuration specifies unknown comparator "${options._comparator}"`);
}
const maxDiffPixels1 = options.maxDiffPixels;
const maxDiffPixels2 = options.maxDiffPixelRatio !== undefined ? expected.width * expected.height * options.maxDiffPixelRatio : undefined;
let maxDiffPixels;
if (maxDiffPixels1 !== undefined && maxDiffPixels2 !== undefined) maxDiffPixels = Math.min(maxDiffPixels1, maxDiffPixels2);else maxDiffPixels = (_ref = maxDiffPixels1 !== null && maxDiffPixels1 !== void 0 ? maxDiffPixels1 : maxDiffPixels2) !== null && _ref !== void 0 ? _ref : 0;
const ratio = Math.ceil(count / (expected.width * expected.height) * 100) / 100;
const pixelsMismatchError = count > maxDiffPixels ? `${count} pixels (ratio ${ratio.toFixed(2)} of all image pixels) are different.` : '';
if (pixelsMismatchError || sizesMismatchError) return {
errorMessage: sizesMismatchError + pixelsMismatchError,
diff: _utilsBundle.PNG.sync.write(diff)
};
return null;
}
function compareText(actual, expectedBuffer) {
if (typeof actual !== 'string') return {
errorMessage: 'Actual result should be a string'
};
const expected = expectedBuffer.toString('utf-8');
if (expected === actual) return null;
const dmp = new diff_match_patch();
const d = dmp.diff_main(expected, actual);
dmp.diff_cleanupSemantic(d);
return {
errorMessage: diff_prettyTerminal(d)
};
}
function diff_prettyTerminal(diffs) {
const html = [];
for (let x = 0; x < diffs.length; x++) {
const op = diffs[x][0]; // Operation (insert, delete, equal)
const data = diffs[x][1]; // Text of change.
const text = data;
switch (op) {
case DIFF_INSERT:
html[x] = _utilsBundle.colors.green(text);
break;
case DIFF_DELETE:
html[x] = _utilsBundle.colors.reset(_utilsBundle.colors.strikethrough(_utilsBundle.colors.red(text)));
break;
case DIFF_EQUAL:
html[x] = text;
break;
}
}
return html.join('');
}
function resizeImage(image, size) {
if (image.width === size.width && image.height === size.height) return image;
const buffer = new Uint8Array(size.width * size.height * 4);
for (let y = 0; y < size.height; y++) {
for (let x = 0; x < size.width; x++) {
const to = (y * size.width + x) * 4;
if (y < image.height && x < image.width) {
const from = (y * image.width + x) * 4;
buffer[to] = image.data[from];
buffer[to + 1] = image.data[from + 1];
buffer[to + 2] = image.data[from + 2];
buffer[to + 3] = image.data[from + 3];
} else {
buffer[to] = 0;
buffer[to + 1] = 0;
buffer[to + 2] = 0;
buffer[to + 3] = 0;
}
}
}
return {
data: Buffer.from(buffer),
width: size.width,
height: size.height
};
}