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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module 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 "qhighdpiscaling_p.h"
#include "qwindow_p.h" // for QWINDOWSIZE_MAX
#include "qguiapplication.h"
#include "qscreen.h"
#include "private/qscreen_p.h"
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
Q_LOGGING_CATEGORY(lcScaling, "qt.scaling");
static inline qreal initialScaleFactor()
{
static const char envVar[] = "QT_SCALE_FACTOR";
qreal result = 1;
if (qEnvironmentVariableIsSet(envVar)) {
bool ok;
const qreal f = qgetenv(envVar).toDouble(&ok);
if (ok && f > 0) {
qCDebug(lcScaling) << "Apply QT_SCALE_FACTOR" << f;
result = f;
}
}
return result;
}
/*!
\class QHighDpiScaling
\since 5.4
\internal
\preliminary
\ingroup qpa
\brief Collection of utility functions for UI scaling.
*/
qreal QHighDpiScaling::m_factor = initialScaleFactor();
bool QHighDpiScaling::m_active = !qFuzzyCompare(QHighDpiScaling::m_factor, qreal(1));
bool QHighDpiScaling::m_perWindowActive = false;
void QHighDpiScaling::setFactor(qreal factor)
{
if (qFuzzyCompare(factor, QHighDpiScaling::m_factor))
return;
if (!QGuiApplication::allWindows().isEmpty()) {
qWarning() << Q_FUNC_INFO << "QHighDpiScaling::setFactor: Should only be called when no windows exist.";
}
QHighDpiScaling::m_active = !qFuzzyCompare(factor, qreal(1));
QHighDpiScaling::m_factor = QHighDpiScaling::m_active ? factor : qreal(1);
Q_FOREACH (QScreen *screen, QGuiApplication::screens())
screen->d_func()->updateHighDpi();
}
static const char *scaleFactorProperty = "_q_scaleFactor";
void QHighDpiScaling::setWindowFactor(QWindow *window, qreal factor)
{
m_perWindowActive = true;
window->setProperty(scaleFactorProperty, QVariant(factor));
}
qreal QHighDpiScaling::factor(const QWindow *window)
{
if (m_perWindowActive || window == 0)
return m_factor;
QVariant windowFactor = window->property(scaleFactorProperty);
return m_factor * (windowFactor.isValid() ? windowFactor.toReal() : 1);
}
Q_GUI_EXPORT QSize qHighDpiToDevicePixelsConstrained(const QSize &size, const QWindow *window)
{
const int width = size.width();
const int height = size.height();
return QSize(width > 0 && width < QWINDOWSIZE_MAX ?
qHighDpiToDevicePixels(width, window) : width,
height > 0 && height < QWINDOWSIZE_MAX ?
qHighDpiToDevicePixels(height, window) : height);
}
QT_END_NAMESPACE
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