File indexing completed on 2024-04-28 05:31:20
0001 /* 0002 SPDX-FileCopyrightText: 2018 Michail Vourlakos <mvourlakos@gmail.com> 0003 SPDX-License-Identifier: GPL-2.0-or-later 0004 */ 0005 0006 0007 function colorBrightness(color) { 0008 return colorBrightnessFromRGB(color.r * 255, color.g * 255, color.b * 255) 0009 } 0010 0011 // formula for brightness according to: 0012 // https://www.w3.org/TR/AERT/#color-contrast 0013 function colorBrightnessFromRGB(r, g, b) { 0014 return (r * 299 + g * 587 + b * 114) / 1000 0015 } 0016 0017 function colorLuminas(color) { 0018 return colorLuminasFromRGB(color.r, color.g, color.b) 0019 } 0020 0021 // formula for luminance according to: 0022 // https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef 0023 function colorLuminasFromRGB(r, g, b) { 0024 var rS = (r <= 0.03928) ? ( r / 12.92) : Math.pow( ((r + 0.055) / 1.055), 2.4 ); 0025 var gS = (g <= 0.03928) ? ( g / 12.92) : Math.pow( ((g + 0.055) / 1.055), 2.4 ); 0026 var bS = (b <= 0.03928) ? ( b / 12.92) : Math.pow( ((b + 0.055) / 1.055), 2.4 ); 0027 0028 return 0.2126*rS + 0.7152*gS + 0.0722*bS; 0029 } 0030 0031 0032 function normalize(min, max, per) { 0033 return min + ((max-min) * per); 0034 }