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64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
/*
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SPDX-FileCopyrightText: 2020 Michail Vourlakos <mvourlakos@gmail.com>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "tools.h"
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// Qt
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#include <QtMath>
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namespace Latte{
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Tools::Tools(QObject *parent)
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: QObject(parent)
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{
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}
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float Tools::colorBrightness(QColor color)
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{
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return colorBrightness(color.red(), color.green(), color.blue());
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}
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float Tools::colorBrightness(QRgb rgb)
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{
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return colorBrightness(qRed(rgb), qGreen(rgb), qBlue(rgb));
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}
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float Tools::colorBrightness(float r, float g, float b)
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{
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float brightness = (r * 299 + g * 587 + b * 114) / 1000;
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return brightness;
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}
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float Tools::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 Tools::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 Tools::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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