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/*
* Copyright (C) 2014 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
.pragma library
/*! \brief Calculate average luminance of the passed colors
\note If not fully opaque, luminance is dependant on blending.
*/
function luminance() {
var sum = 0;
// TODO this was originally
// for (var k in arguments) {
// but for some unkown reason was causing crashes in testDash/testDashContent
// investigate when we have some time
for (var k = 0; k < arguments.length; ++k) {
// only way to convert string to color
var c = Qt.lighter(arguments[k], 1.0);
sum += 0.2126 * c.r + 0.7152 * c.g + 0.0722 * c.b;
}
return sum / arguments.length;
}
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