toolkit/components/places/ColorConversion.js@129ffea94266
toolkit/components/places/ColorConversion.js
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 /**
6 * Given a color in the Lab space, return its chroma (colorfulness,
7 * saturation).
8 *
9 * @param lab
10 * The lab color to get the chroma from
11 *
12 * @return A number greater than zero that measures chroma in the image
13 */
14 function labChroma(lab) {
15 return Math.sqrt(Math.pow(lab.a, 2) + Math.pow(lab.b, 2));
16 }
18 /**
19 * Given the RGB components of a color as integers from 0-255, return the
20 * color in the XYZ color space.
21 *
22 * @return An object with x, y, z properties holding those components of the
23 * color in the XYZ color space.
24 */
25 function rgb2xyz(r, g, b) {
26 r /= 255;
27 g /= 255;
28 b /= 255;
30 // assume sRGB
31 r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
32 g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
33 b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);
35 return {
36 x: ((r * 0.4124) + (g * 0.3576) + (b * 0.1805)) * 100,
37 y: ((r * 0.2126) + (g * 0.7152) + (b * 0.0722)) * 100,
38 z: ((r * 0.0193) + (g * 0.1192) + (b * 0.9505)) * 100
39 };
40 }
42 /**
43 * Given the RGB components of a color as integers from 0-255, return the
44 * color in the Lab color space.
45 *
46 * @return An object with lightness, a, b properties holding those components
47 * of the color in the Lab color space.
48 */
49 function rgb2lab(r, g, b) {
50 let xyz = rgb2xyz(r, g, b),
51 x = xyz.x / 95.047,
52 y = xyz.y / 100,
53 z = xyz.z / 108.883;
55 x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116);
56 y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116);
57 z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116);
59 return {
60 lightness: (116 * y) - 16,
61 a: 500 * (x - y),
62 b: 200 * (y - z)
63 };
64 }
