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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.compare = compare;
var _colorUtils = require("./colorUtils");
var _imageChannel = require("./imageChannel");
var _stats = require("./stats");
/**
* 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 SSIM_WINDOW_RADIUS = 15;
const VARIANCE_WINDOW_RADIUS = 1;
function drawPixel(width, data, x, y, r, g, b) {
const idx = (y * width + x) * 4;
data[idx + 0] = r;
data[idx + 1] = g;
data[idx + 2] = b;
data[idx + 3] = 255;
}
function compare(actual, expected, diff, width, height, options = {}) {
const {
maxColorDeltaE94 = 1.0
} = options;
const paddingSize = Math.max(VARIANCE_WINDOW_RADIUS, SSIM_WINDOW_RADIUS);
const paddingColorEven = [255, 0, 255];
const paddingColorOdd = [0, 255, 0];
const [r1, g1, b1] = _imageChannel.ImageChannel.intoRGB(width, height, expected, {
paddingSize,
paddingColorEven,
paddingColorOdd
});
const [r2, g2, b2] = _imageChannel.ImageChannel.intoRGB(width, height, actual, {
paddingSize,
paddingColorEven,
paddingColorOdd
});
const noop = (x, y) => {};
const drawRedPixel = diff ? (x, y) => drawPixel(width, diff, x - paddingSize, y - paddingSize, 255, 0, 0) : noop;
const drawYellowPixel = diff ? (x, y) => drawPixel(width, diff, x - paddingSize, y - paddingSize, 255, 255, 0) : noop;
const drawGrayPixel = diff ? (x, y) => {
const gray = (0, _colorUtils.rgb2gray)(r1.get(x, y), g1.get(x, y), b1.get(x, y));
const value = (0, _colorUtils.blendWithWhite)(gray, 0.1);
drawPixel(width, diff, x - paddingSize, y - paddingSize, value, value, value);
} : noop;
let fastR, fastG, fastB;
let diffCount = 0;
for (let y = paddingSize; y < r1.height - paddingSize; ++y) {
for (let x = paddingSize; x < r1.width - paddingSize; ++x) {
// Fast-path: equal pixels.
if (r1.get(x, y) === r2.get(x, y) && g1.get(x, y) === g2.get(x, y) && b1.get(x, y) === b2.get(x, y)) {
drawGrayPixel(x, y);
continue;
}
// Compare pixel colors using the dE94 color difference formulae.
// The dE94 is normalized so that the value of 1.0 is the "just-noticeable-difference".
// Color difference below 1.0 is not noticeable to a human eye, so we can disregard it.
// See https://en.wikipedia.org/wiki/Color_difference
const delta = (0, _colorUtils.colorDeltaE94)([r1.get(x, y), g1.get(x, y), b1.get(x, y)], [r2.get(x, y), g2.get(x, y), b2.get(x, y)]);
if (delta <= maxColorDeltaE94) {
drawGrayPixel(x, y);
continue;
}
// if this pixel is a part of a flood fill of a 3x3 square then it cannot be
// anti-aliasing pixel so it must be a pixel difference.
if (!fastR || !fastG || !fastB) {
fastR = new _stats.FastStats(r1, r2);
fastG = new _stats.FastStats(g1, g2);
fastB = new _stats.FastStats(b1, b2);
}
const [varX1, varY1] = r1.boundXY(x - VARIANCE_WINDOW_RADIUS, y - VARIANCE_WINDOW_RADIUS);
const [varX2, varY2] = r1.boundXY(x + VARIANCE_WINDOW_RADIUS, y + VARIANCE_WINDOW_RADIUS);
const var1 = fastR.varianceC1(varX1, varY1, varX2, varY2) + fastG.varianceC1(varX1, varY1, varX2, varY2) + fastB.varianceC1(varX1, varY1, varX2, varY2);
const var2 = fastR.varianceC2(varX1, varY1, varX2, varY2) + fastG.varianceC2(varX1, varY1, varX2, varY2) + fastB.varianceC2(varX1, varY1, varX2, varY2);
if (var1 === 0 && var2 === 0) {
drawRedPixel(x, y);
++diffCount;
continue;
}
const [ssimX1, ssimY1] = r1.boundXY(x - SSIM_WINDOW_RADIUS, y - SSIM_WINDOW_RADIUS);
const [ssimX2, ssimY2] = r1.boundXY(x + SSIM_WINDOW_RADIUS, y + SSIM_WINDOW_RADIUS);
const ssimRGB = ((0, _stats.ssim)(fastR, ssimX1, ssimY1, ssimX2, ssimY2) + (0, _stats.ssim)(fastG, ssimX1, ssimY1, ssimX2, ssimY2) + (0, _stats.ssim)(fastB, ssimX1, ssimY1, ssimX2, ssimY2)) / 3.0;
const isAntialiassed = ssimRGB >= 0.99;
if (isAntialiassed) {
drawYellowPixel(x, y);
} else {
drawRedPixel(x, y);
++diffCount;
}
}
}
return diffCount;
}