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39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
// Copyright(c) 2017-2019 Alejandro Sirgo Rica & Contributors
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//
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// This file is part of Flameshot.
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//
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// Flameshot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Flameshot 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 Flameshot. If not, see <http://www.gnu.org/licenses/>.
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#include "colorutils.h"
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inline qreal getColorLuma(const QColor& c)
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{
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return 0.30 * c.redF() + 0.59 * c.greenF() + 0.11 * c.blueF();
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}
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bool ColorUtils::colorIsDark(const QColor& c)
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{
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// when luma <= 0.5, we considor it as a dark color
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return getColorLuma(c) <= 0.5;
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}
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QColor ColorUtils::contrastColor(const QColor& c)
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{
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int change = colorIsDark(c) ? 30 : -45;
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return QColor(qBound(0, c.red() + change, 255),
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qBound(0, c.green() + change, 255),
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qBound(0, c.blue() + change, 255));
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}
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