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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: http://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QWINDOWSSCALING_H
#define QWINDOWSSCALING_H
#include <QtGui/QRegion>
#include <QtCore/QVector>
#include <QtCore/QRect>
QT_BEGIN_NAMESPACE
enum
#if defined(Q_COMPILER_CLASS_ENUM) || defined(Q_CC_MSVC)
: int
#endif
{ QWINDOWSIZE_MAX = 16777215 };
class QWindowsScaling {
public:
static bool isActive() { return m_factor > 1; }
static int factor() { return m_factor; }
static void setFactor(int factor) { m_factor = factor; }
static int determineUiScaleFactor();
// Scaling helpers for size constraints.
static int mapToNativeConstrained(int qt)
{ return m_factor != 1 && qt > 0 && qt < QWINDOWSIZE_MAX ? qt * m_factor : qt; }
static int mapFromNativeConstrained(int dp)
{ return m_factor != 1 && dp > 0 && dp < QWINDOWSIZE_MAX ? dp / m_factor : dp; }
static QSize mapToNativeConstrained(const QSize &qt)
{ return QSize(mapToNativeConstrained(qt.width()), mapToNativeConstrained(qt.height())); }
static QRect mapToNative(const QRect &qRect)
{
return QRect(qRect.x() * m_factor, qRect.y() * m_factor, qRect.width() * m_factor, qRect.height() * m_factor);
}
static QRect mapFromNative(const QRect &dp)
{
return isActive() ?
QRect(dp.x() / m_factor, dp.y() / m_factor, (dp.width() + 1) / m_factor, (dp.height() + 1) / m_factor) :
dp;
}
static QRegion mapToNative(const QRegion ®ionQt)
{
if (!QWindowsScaling::isActive() || regionQt.isEmpty())
return regionQt;
QRegion result;
foreach (const QRect &rectQt, regionQt.rects())
result += QWindowsScaling::mapToNative(rectQt);
return result;
}
static QRegion mapFromNative(const QRegion ®ionDp)
{
if (!QWindowsScaling::isActive() || regionDp.isEmpty())
return regionDp;
QRegion result;
foreach (const QRect &rectDp, regionDp.rects())
result += QWindowsScaling::mapFromNative(rectDp);
return result;
}
private:
static int m_factor;
};
QT_END_NAMESPACE
#endif // QWINDOWSSCALING_H
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