toolkit/components/places/ColorConversion.js@129ffea94266 (annotated)
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.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | /** |
| michael@0 | 6 | * Given a color in the Lab space, return its chroma (colorfulness, |
| michael@0 | 7 | * saturation). |
| michael@0 | 8 | * |
| michael@0 | 9 | * @param lab |
| michael@0 | 10 | * The lab color to get the chroma from |
| michael@0 | 11 | * |
| michael@0 | 12 | * @return A number greater than zero that measures chroma in the image |
| michael@0 | 13 | */ |
| michael@0 | 14 | function labChroma(lab) { |
| michael@0 | 15 | return Math.sqrt(Math.pow(lab.a, 2) + Math.pow(lab.b, 2)); |
| michael@0 | 16 | } |
| michael@0 | 17 | |
| michael@0 | 18 | /** |
| michael@0 | 19 | * Given the RGB components of a color as integers from 0-255, return the |
| michael@0 | 20 | * color in the XYZ color space. |
| michael@0 | 21 | * |
| michael@0 | 22 | * @return An object with x, y, z properties holding those components of the |
| michael@0 | 23 | * color in the XYZ color space. |
| michael@0 | 24 | */ |
| michael@0 | 25 | function rgb2xyz(r, g, b) { |
| michael@0 | 26 | r /= 255; |
| michael@0 | 27 | g /= 255; |
| michael@0 | 28 | b /= 255; |
| michael@0 | 29 | |
| michael@0 | 30 | // assume sRGB |
| michael@0 | 31 | r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92); |
| michael@0 | 32 | g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92); |
| michael@0 | 33 | b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92); |
| michael@0 | 34 | |
| michael@0 | 35 | return { |
| michael@0 | 36 | x: ((r * 0.4124) + (g * 0.3576) + (b * 0.1805)) * 100, |
| michael@0 | 37 | y: ((r * 0.2126) + (g * 0.7152) + (b * 0.0722)) * 100, |
| michael@0 | 38 | z: ((r * 0.0193) + (g * 0.1192) + (b * 0.9505)) * 100 |
| michael@0 | 39 | }; |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | /** |
| michael@0 | 43 | * Given the RGB components of a color as integers from 0-255, return the |
| michael@0 | 44 | * color in the Lab color space. |
| michael@0 | 45 | * |
| michael@0 | 46 | * @return An object with lightness, a, b properties holding those components |
| michael@0 | 47 | * of the color in the Lab color space. |
| michael@0 | 48 | */ |
| michael@0 | 49 | function rgb2lab(r, g, b) { |
| michael@0 | 50 | let xyz = rgb2xyz(r, g, b), |
| michael@0 | 51 | x = xyz.x / 95.047, |
| michael@0 | 52 | y = xyz.y / 100, |
| michael@0 | 53 | z = xyz.z / 108.883; |
| michael@0 | 54 | |
| michael@0 | 55 | x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116); |
| michael@0 | 56 | y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116); |
| michael@0 | 57 | z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116); |
| michael@0 | 58 | |
| michael@0 | 59 | return { |
| michael@0 | 60 | lightness: (116 * y) - 16, |
| michael@0 | 61 | a: 500 * (x - y), |
| michael@0 | 62 | b: 200 * (y - z) |
| michael@0 | 63 | }; |
| michael@0 | 64 | } |
