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56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
/*
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* Copyright 2018 Michail Vourlakos <mvourlakos@gmail.com>
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*
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* This file is part of Latte-Dock
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*
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* Latte-Dock is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* Latte-Dock 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 General Public License for more details.
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*
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* You should have received a copy of the GNU 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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#include "commontools.h"
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#include <QtMath>
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namespace Latte {
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float colorLumina(QRgb rgb)
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{
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float r = (float)(qRed(rgb)) / 255;
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float g = (float)(qGreen(rgb)) / 255;
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float b = (float)(qBlue(rgb)) / 255;
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return colorLumina(r, g, b);
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}
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float colorLumina(QColor color)
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{
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return colorLumina(color.redF(), color.greenF(), color.blueF());
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}
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float colorLumina(float r, float g, float b)
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{
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// formula for luminance according to:
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// https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef
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float rS = (r <= 0.03928 ? r / 12.92 : qPow(((r + 0.055) / 1.055), 2.4));
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float gS = (g <= 0.03928 ? g / 12.92 : qPow(((g + 0.055) / 1.055), 2.4));
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float bS = (b <= 0.03928 ? b / 12.92 : qPow(((b + 0.055) / 1.055), 2.4));
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float luminosity = 0.2126 * rS + 0.7152 * gS + 0.0722 * bS;
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return luminosity;
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}
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}
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