66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
/*
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* @copyright Copyright (c) 2016 Julius Härtl <jus@bitgrid.net>
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*
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* @author Julius Härtl <jus@bitgrid.net>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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app.filter('iconWhiteFilter', function() {
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return function (hex) {
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// RGB2HLS by Garry Tan
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// http://axonflux.com/handy-rgb-to-hsl-and-rgb-to-hsv-color-model-c
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var result = /^([A-Fa-f\d]{2})([A-Fa-f\d]{2})([A-Fa-f\d]{2})$/i.exec(hex);
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var color = result ? {
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r: parseInt(result[1], 16),
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g: parseInt(result[2], 16),
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b: parseInt(result[3], 16)
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} : null;
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if(result !== null) {
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r = color.r/255;
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g = color.g/255;
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b = color.b/255;
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var max = Math.max(r, g, b), min = Math.min(r, g, b);
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var h, s, l = (max + min) / 2;
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if(max == min){
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h = s = 0; // achromatic
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}else{
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var d = max - min;
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s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
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switch(max){
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case r: h = (g - b) / d + (g < b ? 6 : 0); break;
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case g: h = (b - r) / d + 2; break;
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case b: h = (r - g) / d + 4; break;
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}
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h /= 6;
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}
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// TODO: Maybe just darken/lighten the color
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if(l<0.5) {
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return "-white";
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} else {
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return "";
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}
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//var rgba = "rgba(" + color.r + "," + color.g + "," + color.b + ",0.7)";
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//return rgba;
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} else {
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return "";
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}
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}
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});
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