toad.city
That fuck shit the fascists are using
1/**
2 * Source: https://github.com/hsch/blurhash-java
3 *
4 * Copyright (c) 2019 Hendrik Schnepel
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
7 * associated documentation files (the "Software"), to deal in the Software without restriction,
8 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
9 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in all copies or
13 * substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
16 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 */
21package org.tm.archive.blurhash;
22
23final class BlurHashUtil {
24
25 static double sRGBToLinear(long value) {
26 double v = value / 255.0;
27 if (v <= 0.04045) {
28 return v / 12.92;
29 } else {
30 return Math.pow((v + 0.055) / 1.055, 2.4);
31 }
32 }
33
34 static long linearTosRGB(double value) {
35 double v = Math.max(0, Math.min(1, value));
36 if (v <= 0.0031308) {
37 return (long)(v * 12.92 * 255 + 0.5);
38 } else {
39 return (long)((1.055 * Math.pow(v, 1 / 2.4) - 0.055) * 255 + 0.5);
40 }
41 }
42
43 static double signPow(double val, double exp) {
44 return Math.copySign(Math.pow(Math.abs(val), exp), val);
45 }
46
47 static double max(double[][] values, int from, int endExclusive) {
48 double result = Double.NEGATIVE_INFINITY;
49 for (int i = from; i < endExclusive; i++) {
50 for (int j = 0; j < values[i].length; j++) {
51 double value = values[i][j];
52 if (value > result) {
53 result = value;
54 }
55 }
56 }
57 return result;
58 }
59
60 private BlurHashUtil() {
61 }
62}