The Tor Browser / file comparison
comparison: toolkit/components/places/ColorConversion.js
toolkit/components/places/ColorConversion.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:4006303d1ce2 |
|---|---|
| 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/. */ | |
| 4 | |
| 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 } | |
| 17 | |
| 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; | |
| 29 | |
| 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); | |
| 34 | |
| 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 } | |
| 41 | |
| 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; | |
| 54 | |
| 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); | |
| 58 | |
| 59 return { | |
| 60 lightness: (116 * y) - 16, | |
| 61 a: 500 * (x - y), | |
| 62 b: 200 * (y - z) | |
| 63 }; | |
| 64 } |
