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Diffstat (limited to 'src/plugins/platforms/windows/qwindowsscaling.cpp')
-rw-r--r-- | src/plugins/platforms/windows/qwindowsscaling.cpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/qwindowsscaling.cpp b/src/plugins/platforms/windows/qwindowsscaling.cpp new file mode 100644 index 0000000000..fcc3440b42 --- /dev/null +++ b/src/plugins/platforms/windows/qwindowsscaling.cpp @@ -0,0 +1,79 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the plugins of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qwindowsscaling.h" +#include "qwindowsscreen.h" + +#include <QtCore/QDebug> +#include <QtCore/QCoreApplication> + +QT_BEGIN_NAMESPACE + +/*! + \class QWindowsScaling + \brief Windows scaling utilities + + \internal + \ingroup qt-lighthouse-win +*/ + +int QWindowsScaling::m_factor = 1; + +static const char devicePixelRatioEnvVar[] = "QT_DEVICE_PIXEL_RATIO"; + +// Suggest a scale factor by checking monitor sizes. +int QWindowsScaling::determineUiScaleFactor() +{ + if (!qEnvironmentVariableIsSet(devicePixelRatioEnvVar)) + return 1; + const QByteArray envDevicePixelRatioEnv = qgetenv(devicePixelRatioEnvVar); + // Auto: Suggest a scale factor by checking monitor resolution. + if (envDevicePixelRatioEnv == QByteArrayLiteral("auto")) { + const int maxResolution = QWindowsScreen::maxMonitorHorizResolution(); + return maxResolution > 180 ? maxResolution / 96 : 1; + } + // Get factor from environment + bool ok = false; + const int envFactor = envDevicePixelRatioEnv.toInt(&ok); + return ok && envFactor > 0 ? envFactor : 1; +} + +QT_END_NAMESPACE |