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70 lines
2.3 KiB
70 lines
2.3 KiB
/******************************************************************** |
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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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// do not 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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