70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2008 Louai Al-Khanji <louai.khanji@gmail.com>
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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 General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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 General Public License for more details.
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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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// This contains code shared by the shadow effect and shadow effect configurator
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// Mark all functions static so the symbols are not exported!
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#ifndef KWIN_SHADOW_HELPER_H
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#define KWIN_SHADOW_HELPER_H
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#include <KColorScheme>
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#include <KColorUtils>
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static const int MAX_ITERS = 10; // should be enough
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static const qreal LUMA_THRESHOLD = 0.05;
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static const qreal MINIMUM_CONTRAST = 3.0;
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static bool contrastTooLow(const QColor& one, const QColor& two)
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{
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return KColorUtils::contrastRatio(one, two) < MINIMUM_CONTRAST;
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}
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static QColor schemeShadowColor()
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{
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QPalette palette;
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QColor shadowColor;
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QPalette::ColorRole shadowRole;
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QColor windowColor;
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windowColor = palette.color(QPalette::Window);
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if (KColorUtils::luma(windowColor) >= LUMA_THRESHOLD)
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shadowRole = QPalette::Shadow;
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else
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shadowRole = QPalette::Light;
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shadowColor = palette.color(shadowRole);
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// Some styles might set a weird shadow or light color. Make sure we
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// dont't end up looping forever or we might lock up the desktop!!
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int iters = 0;
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while (contrastTooLow(shadowColor, windowColor) && iters < MAX_ITERS)
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{
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iters++;
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if (shadowRole == QPalette::Shadow)
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shadowColor = KColorUtils::darken(shadowColor);
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else
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shadowColor = KColorUtils::lighten(shadowColor);
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}
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return shadowColor;
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}
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#endif // KWIN_SHADOW_HELPER_H
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