Repository navigation
Expand file tree
/
Copy pathindex.js
More file actions
278 lines (214 loc) · 8.3 KB
/
Copy pathindex.js
File metadata and controls
278 lines (214 loc) · 8.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
'use strict';
const colorDiff = require('color-diff');
const img = require('./lib/image');
const areColorsSame = require('./lib/same-colors');
const AntialiasingComparator = require('./lib/antialiasing-comparator');
const IgnoreCaretComparator = require('./lib/ignore-caret-comparator');
const DiffArea = require('./lib/diff-area');
const utils = require('./lib/utils');
const {JND, PNG: {RGBA_CHANNELS}} = require('./lib/constants');
const makeAntialiasingComparator = (comparator, img1, img2, opts) => {
const antialiasingComparator = new AntialiasingComparator(comparator, img1, img2, opts);
return (data) => antialiasingComparator.compare(data);
};
const makeNoCaretColorComparator = (comparator, pixelRatio) => {
const caretComparator = new IgnoreCaretComparator(comparator, pixelRatio);
return (data) => caretComparator.compare(data);
};
function makeCIEDE2000Comparator(tolerance) {
const upperBound = tolerance * 6.2; // cie76 <= 6.2 * ciede2000
const lowerBound = tolerance * 0.695; // cie76 >= 0.695 * ciede2000
let rgbColor1 = {};
let rgbColor2 = {};
let labColor1 = {};
let labColor2 = {};
return function doColorsLookSame(data) {
if (areColorsSame(data)) {
return true;
}
let lab1, lab2;
/*jshint camelcase:false*/
if (areColorsSame({color1: data.color1, color2: rgbColor1})) {
lab1 = labColor1;
} else if (areColorsSame({color1: data.color1, color2: rgbColor2})) {
lab1 = labColor2;
}
if (areColorsSame({color1: data.color2, color2: rgbColor1})) {
lab2 = labColor1;
} else if (areColorsSame({color1: data.color2, color2: rgbColor2})) {
lab2 = labColor2;
}
if (!lab1) {
lab1 = colorDiff.rgb_to_lab(data.color1);
rgbColor1 = data.color1;
labColor1 = lab1;
}
if (!lab2) {
lab2 = colorDiff.rgb_to_lab(data.color2);
rgbColor2 = data.color2;
labColor2 = lab2;
}
const cie76 = Math.sqrt(
(lab1.L - lab2.L) * (lab1.L - lab2.L) +
(lab1.a - lab2.a) * (lab1.a - lab2.a) +
(lab1.b - lab2.b) * (lab1.b - lab2.b)
);
if (cie76 >= upperBound) {
return false;
}
if (cie76 <= lowerBound) {
return true;
}
return colorDiff.diff(lab1, lab2) < tolerance;
};
}
const createComparator = (img1, img2, opts) => {
let comparator = opts.strict ? areColorsSame : makeCIEDE2000Comparator(opts.tolerance);
if (opts.ignoreAntialiasing) {
comparator = makeAntialiasingComparator(comparator, img1, img2, opts);
}
if (opts.ignoreCaret) {
comparator = makeNoCaretColorComparator(comparator, opts.pixelRatio);
}
return comparator;
};
const iterateRect = async (width, height, callback) => {
return new Promise((resolve) => {
const processRow = (y) => {
setImmediate(() => {
for (let x = 0; x < width; x++) {
callback(x, y);
}
y++;
if (y < height) {
processRow(y);
} else {
resolve();
}
});
};
processRow(0);
});
};
const buildDiffImage = async (img1, img2, options) => {
const width = Math.max(img1.width, img2.width);
const height = Math.max(img1.height, img2.height);
const minWidth = Math.min(img1.width, img2.width);
const minHeight = Math.min(img1.height, img2.height);
const highlightColor = options.highlightColor;
const resultBuffer = Buffer.allocUnsafe(width * height * RGBA_CHANNELS);
const setPixel = (buf, x, y, {R, G, B}) => {
const pixelInd = (y * width + x) * RGBA_CHANNELS;
buf[pixelInd] = R;
buf[pixelInd + 1] = G;
buf[pixelInd + 2] = B;
buf[pixelInd + 3] = 0xff;
};
await iterateRect(width, height, (x, y) => {
if (x >= minWidth || y >= minHeight) {
setPixel(resultBuffer, x, y, highlightColor);
return;
}
const color1 = img1.getPixel(x, y);
const color2 = img2.getPixel(x, y);
if (!options.comparator({color1, color2, img1, img2, x, y, width, height, minWidth, minHeight})) {
setPixel(resultBuffer, x, y, highlightColor);
} else {
setPixel(resultBuffer, x, y, color1);
}
});
return img.fromBuffer(resultBuffer, {rgb: {width, height}});
};
const getToleranceFromOpts = (opts) => {
if (!Object.hasOwn(opts, 'tolerance')) {
return JND;
}
if (opts.strict) {
throw new TypeError('Unable to use "strict" and "tolerance" options together');
}
return opts.tolerance;
};
const prepareOpts = (opts) => {
opts = opts || {};
opts.tolerance = getToleranceFromOpts(opts);
const defaults = {
ignoreCaret: true,
ignoreAntialiasing: true,
antialiasingTolerance: 0
};
return Object.assign(defaults, opts);
};
const getMaxDiffBounds = (first, second) => {
const {x: left, y: top} = first.getActualCoord(0, 0);
return {
left,
top,
right: left + Math.max(first.width, second.width) - 1,
bottom: top + Math.max(first.height, second.height) - 1
};
};
module.exports = exports = async function looksSame(image1, image2, opts = {}) {
opts = prepareOpts(opts);
[image1, image2] = utils.formatImages(image1, image2);
const {first, second} = await utils.readPair(image1, image2, utils.readBufferCb);
const areBuffersEqual = utils.areBuffersEqual(first, second);
const refImg = {size: {width: first.width, height: first.height}};
const metaInfo = {refImg};
if (areBuffersEqual) {
const diffBounds = (new DiffArea()).area;
return {equal: true, metaInfo, diffBounds, diffClusters: [diffBounds], diffImage: null};
}
if (!opts.createDiffImage && (first.width !== second.width || first.height !== second.height)) {
const diffBounds = getMaxDiffBounds(first, second);
return {equal: false, metaInfo, diffBounds, diffClusters: [diffBounds]};
}
const {first: img1, second: img2} = await utils.readPair(
{...image1, source: first.buffer},
{...image2, source: second.buffer},
utils.readImgCb
);
const comparator = createComparator(img1, img2, opts);
const {stopOnFirstFail, shouldCluster, clustersSize, createDiffImage, highlightColor} = opts;
if (createDiffImage) {
return utils.calcDiffImage(img1, img2, comparator, {highlightColor, shouldCluster, clustersSize});
}
const {diffArea, diffClusters} = await utils.getDiffPixelsCoords(img1, img2, comparator, {stopOnFirstFail, shouldCluster, clustersSize});
const diffBounds = diffArea.area;
const equal = diffArea.isEmpty();
return {equal, metaInfo, diffBounds, diffClusters};
};
exports.getDiffArea = async function(image1, image2, opts = {}) {
opts = prepareOpts(opts);
[image1, image2] = utils.formatImages(image1, image2);
const {first, second} = await utils.readPair(image1, image2);
if (first.width !== second.width || first.height !== second.height) {
return getMaxDiffBounds(first, second);
}
const comparator = createComparator(first, second, opts);
const {diffArea} = await utils.getDiffPixelsCoords(first, second, comparator, opts);
if (diffArea.isEmpty()) {
return null;
}
return diffArea.area;
};
exports.createDiff = async function saveDiff(opts) {
opts = prepareOpts(opts);
opts.extension = opts.extension || 'png';
const [image1, image2] = utils.formatImages(opts.reference, opts.current);
const {first, second} = await utils.readPair(image1, image2);
const diffImage = await buildDiffImage(first, second, {
highlightColor: utils.parseColorString(opts.highlightColor),
comparator: createCompar
3F17
ator(first, second, opts)
});
return opts.diff === undefined
? diffImage.createBuffer(opts.extension)
: diffImage.save(opts.diff);
};
exports.colors = (color1, color2, opts) => {
opts = opts || {};
if (opts.tolerance === undefined) {
opts.tolerance = JND;
}
const comparator = makeCIEDE2000Comparator(opts.tolerance);
return comparator({color1, color2});
};