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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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QHIGHDPISCALING_P_H
+#define QHIGHDPISCALING_P_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qmargins.h>
+#include <QtCore/qrect.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qloggingcategory.h>
+#include <QtGui/qregion.h>
+#include <QtGui/qscreen.h>
+#include <QtGui/qwindow.h>
+
+// This file implmements utility functions for high-dpi scaling on operating
+// systems that do not provide native scaling support.
+//
+// The functions support creating a logical device-independent
+// coordinate system which is related to the device pixel coordinate
+// through a scaling factor.
+//
+// Several scaling factors can be set:
+//   - A process-global scale factor
+//       - the QT_SCALE_FACTOR environment variable.
+//       - QHighDpiScaling::setFactor(factor);
+//   - A per-window scale factor
+//       - QHighDpiScaling::setWindowFactor(window, factor);
+//
+// With these functions in use  most of the Qt API will then operate in
+// the device-independent coordinate system. For example, setting
+// the scale factor to 2.0 will make Qt see half of the "device"
+// window geometry. Desktop and event geometry will be scaled
+// to match.
+//
+// Integer scaling factors work best. Glitch-free graphics at non-integer
+// scaling factors can not be guaranteed.
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcScaling);
+
+class QScreen;
+class QPlatformScreen;
+
+class Q_GUI_EXPORT QHighDpiScaling {
+public:
+    static void initHighDPiScaling();
+    static void setGlobalFactor(qreal factor);
+    static void setScreenFactor(QScreen *window, qreal factor);
+
+    static bool isActive() { return m_active; }
+    static qreal factor(const QWindow *window);
+    static qreal factor(const QScreen *screen);
+    static qreal factor(const QPlatformScreen *platformScreen);
+    static QPoint origin(const QScreen *screen);
+    static QPoint origin(const QPlatformScreen *platformScreen);
+    static QPoint mapPositionFromNative(const QPoint &pos, const QPlatformScreen *platformScreen);
+    static QPoint mapPositionToNative(const QPoint &pos, const QPlatformScreen *platformScreen);
+private:
+    static qreal screenSubfactor(const QPlatformScreen *screen);
+
+    static qreal m_factor;
+    static bool m_active;
+    static bool m_perScreenActive;
+    static bool m_usePixelDensity;
+};
+
+// Coordinate system conversion functions:
+// QHighDpi::fromNativePixels   : from physical(screen/backing) to logical pixels
+// QHighDpi::toNativePixels              : from logical to physical pixels
+
+namespace QHighDpi {
+
+// inline QRect fromNativeGeometry(const QRect &pixelRect, const QPlatformScreen *platformScreen)
+// {
+//     return QRect(pixelRect.topLeft(), pixelRect.size() / QHighDpiScaling::factor(platformScreen));
+// }
+
+// inline QRect toNativeGeometry(const QRect &pointRect, const QPlatformScreen *platformScreen)
+// {
+//     return QRect(pointRect.topLeft(), pointRect.size() * QHighDpiScaling::factor(platformScreen));
+// }
+
+inline QPoint fromNative(const QPoint &pos, qreal scaleFactor, const QPoint &origin)
+{
+     return (pos - origin) / scaleFactor + origin;
+}
+
+inline QPoint toNative(const QPoint &pos, qreal scaleFactor, const QPoint &origin)
+{
+     return (pos - origin) * scaleFactor + origin;
+}
+
+inline QPoint fromNative(const QPoint &pos, qreal scaleFactor)
+{
+     return pos / scaleFactor;
+}
+
+inline QPoint toNative(const QPoint &pos, qreal scaleFactor)
+{
+    return pos * scaleFactor;
+}
+
+inline QSize fromNative(const QSize &size, qreal scaleFactor)
+{
+    return size / scaleFactor; // TODO: ### round up ###
+}
+
+inline QSize toNative(const QSize &size, qreal scaleFactor)
+{
+    return size * scaleFactor;
+}
+
+inline QRect fromNative(const QRect &rect, qreal scaleFactor, const QPoint &origin)
+{
+    return QRect(fromNative(rect.topLeft(), scaleFactor, origin), fromNative(rect.size(), scaleFactor));
+}
+
+inline QRect toNative(const QRect &rect, qreal scaleFactor, const QPoint &origin)
+{
+    return QRect(toNative(rect.topLeft(), scaleFactor, origin), toNative(rect.size(), scaleFactor));
+
+}
+
+inline QRect fromNative(const QRect &rect, const QScreen *screen, const QPoint &screenOrigin)
+{
+    return toNative(rect, QHighDpiScaling::factor(screen), screenOrigin);
+}
+
+inline QRect fromNativeScreenGeometry(const QRect &nativeScreenGeometry, const QScreen *screen)
+{
+    return QRect(nativeScreenGeometry.topLeft(), fromNative(nativeScreenGeometry.size(), QHighDpiScaling::factor(screen)));
+}
+
+inline QPoint fromNativeLocalPosition(const QPoint &pos, const QWindow *window)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(window);
+    return pos / scaleFactor;
+}
+
+inline QPoint toNativeLocalPosition(const QPoint &pos, const QWindow *window)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(window);
+    return pos * scaleFactor;
+}
+
+inline QPointF fromNativeLocalPosition(const QPointF &pos, const QWindow *window)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(window);
+    return pos / scaleFactor;
+}
+
+inline QPointF toNativeLocalPosition(const QPointF &pos, const QWindow *window)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(window);
+    return pos * scaleFactor;
+}
+
+inline QRect fromNativePixels(const QRect &pixelRect, const QPlatformScreen *platformScreen)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(platformScreen);
+    const QPoint origin = QHighDpiScaling::origin(platformScreen);
+    return QRect(fromNative(pixelRect.topLeft(), scaleFactor, origin),
+                 fromNative(pixelRect.size(), scaleFactor));
+}
+
+inline QRect toNativePixels(const QRect &pointRect, const QPlatformScreen *platformScreen)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(platformScreen);
+    const QPoint origin = QHighDpiScaling::origin(platformScreen);
+    return QRect(toNative(pointRect.topLeft(), scaleFactor, origin),
+                 toNative(pointRect.size(), scaleFactor));
+}
+
+inline QRect fromNativePixels(const QRect &pixelRect, const QScreen *screen)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(screen);
+    const QPoint origin = QHighDpiScaling::origin(screen);
+    return QRect(fromNative(pixelRect.topLeft(), scaleFactor, origin),
+                 fromNative(pixelRect.size(), scaleFactor));
+}
+
+inline QRect toNativePixels(const QRect &pointRect, const QScreen *screen)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(screen);
+    const QPoint origin = QHighDpiScaling::origin(screen);
+    return QRect(toNative(pointRect.topLeft(), scaleFactor, origin),
+                 toNative(pointRect.size(), scaleFactor));
+}
+
+inline QRect fromNativePixels(const QRect &pixelRect, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen()) {
+        return fromNativePixels(pixelRect, window->screen());
+    } else {
+        const qreal scaleFactor = QHighDpiScaling::factor(window);
+        return QRect(pixelRect.topLeft() / scaleFactor, fromNative(pixelRect.size(), scaleFactor));
+    }
+}
+
+inline QRectF toNativePixels(const QRectF &pointRect, const QScreen *screen)
+{
+    //########
+    return toNativePixels(pointRect.toRect(), screen);
+}
+
+inline QRect toNativePixels(const QRect &pointRect, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen()) {
+        return toNativePixels(pointRect, window->screen());
+    } else {
+        const qreal scaleFactor = QHighDpiScaling::factor(window);
+        return QRect(pointRect.topLeft() * scaleFactor, toNative(pointRect.size(), scaleFactor));
+    }
+}
+
+inline QRectF fromNativePixels(const QRectF &pixelRect, const QScreen *screen)
+{
+    //########
+    return fromNativePixels(pixelRect.toRect(), screen);
+}
+
+inline QRectF fromNativePixels(const QRectF &pixelRect, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen()) {
+        return fromNativePixels(pixelRect, window->screen());
+    } else {
+        const qreal scaleFactor = QHighDpiScaling::factor(window);
+        return QRectF(pixelRect.topLeft() / scaleFactor, pixelRect.size() / scaleFactor);
+    }
+}
+
+inline QRectF toNativePixels(const QRectF &pointRect, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen()) {
+        return toNativePixels(pointRect, window->screen());
+    } else {
+        const qreal scaleFactor = QHighDpiScaling::factor(window);
+        return QRectF(pointRect.topLeft() * scaleFactor, pointRect.size() * scaleFactor);
+    }
+}
+
+inline QSize fromNativePixels(const QSize &pixelSize, const QWindow *window)
+{
+    return pixelSize / QHighDpiScaling::factor(window);
+}
+
+inline QSize toNativePixels(const QSize &pointSize, const QWindow *window)
+{
+    return pointSize * QHighDpiScaling::factor(window);
+}
+
+inline QSizeF fromNativePixels(const QSizeF &pixelSize, const QWindow *window)
+{
+    return pixelSize / QHighDpiScaling::factor(window);
+}
+
+inline QSizeF toNativePixels(const QSizeF &pointSize, const QWindow *window)
+{
+    return pointSize * QHighDpiScaling::factor(window);
+}
+
+inline QPoint fromNativePixels(const QPoint &pixelPoint, const QScreen *screen)
+{
+    return fromNative(pixelPoint, QHighDpiScaling::factor(screen), QHighDpiScaling::origin(screen));
+}
+
+inline QPoint fromNativePixels(const QPoint &pixelPoint, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen())
+        return fromNativePixels(pixelPoint, window->screen());
+    else
+        return pixelPoint / QHighDpiScaling::factor(window);
+}
+
+inline QPoint toNativePixels(const QPoint &pointPoint, const QScreen *screen)
+{
+    return toNative(pointPoint, QHighDpiScaling::factor(screen), QHighDpiScaling::origin(screen));
+}
+
+inline QPoint toNativePixels(const QPoint &pointPoint, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen())
+        return toNativePixels(pointPoint, window->screen());
+    else
+        return pointPoint * QHighDpiScaling::factor(window);
+}
+
+inline QPointF fromNativePixels(const QPointF &pixelPoint, const QScreen *screen)
+{
+    return fromNativePixels(pixelPoint.toPoint(), screen); //###############
+}
+
+inline QPointF fromNativePixels(const QPointF &pixelPoint, const QWindow *window)
+{
+    if (window && window->isTopLevel() && window->screen())
+        return fromNativePixels(pixelPoint, window->screen());
+    else
+        return pixelPoint / QHighDpiScaling::factor(window);
+}
+
+inline QPointF toNativePixels(const QPointF &pointPoint, const QScreen *screen)
+{
+    return toNativePixels(pointPoint.toPoint(), screen); //###########
+}
+
+inline QPointF toNativePixels(const QPointF &pointPoint, const QWindow *window)
+{
+     if (window && window->isTopLevel() && window->screen())
+        return toNativePixels(pointPoint, window->screen());
+    else
+        return pointPoint * QHighDpiScaling::factor(window);
+}
+
+inline QMargins fromNativePixels(const QMargins &pixelMargins, const QWindow *window)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(window);
+    return QMargins(pixelMargins.left() / scaleFactor, pixelMargins.top() / scaleFactor,
+                    pixelMargins.right() / scaleFactor, pixelMargins.bottom() / scaleFactor);
+}
+
+inline QMargins toNativePixels(const QMargins &pointMargins, const QWindow *window)
+{
+    const qreal scaleFactor = QHighDpiScaling::factor(window);
+    return QMargins(pointMargins.left() * scaleFactor, pointMargins.top() * scaleFactor,
+                    pointMargins.right() * scaleFactor, pointMargins.bottom() * scaleFactor);
+}
+#if 1
+    //############## expose regions need special handling
+inline QRegion fromNativeLocalRegion(const QRegion &pixelRegion, const QWindow *window)
+{
+    if (!QHighDpiScaling::isActive())
+        return pixelRegion;
+
+    qreal scaleFactor = QHighDpiScaling::factor(window);
+    QRegion pointRegion;
+    foreach (const QRect &rect, pixelRegion.rects())
+        pointRegion += QRect(fromNative(rect.topLeft(), scaleFactor),
+                             fromNative(rect.size(), scaleFactor));
+    return pointRegion;
+}
+
+inline QRegion toNativeLocalRegion(const QRegion &pointRegion, const QWindow *window)
+{
+    if (!QHighDpiScaling::isActive())
+        return pointRegion;
+
+    qreal scaleFactor = QHighDpiScaling::factor(window);
+    QRegion pixelRegon;
+    foreach (const QRect &rect, pointRegion.rects())
+        pixelRegon += QRect(toNative(rect.topLeft(), scaleFactor),
+                             toNative(rect.size(), scaleFactor));
+    return pixelRegon;
+}
+#endif
+// Any T that has operator/()
+template <typename T>
+T fromNativePixels(const T &pixelValue, const QWindow *window)
+{
+    if (!QHighDpiScaling::isActive())
+        return pixelValue;
+
+    return pixelValue / QHighDpiScaling::factor(window);
+
+}
+
+    //##### ?????
+template <typename T>
+T fromNativePixels(const T &pixelValue, const QScreen *screen)
+{
+    if (!QHighDpiScaling::isActive())
+        return pixelValue;
+
+    return pixelValue / QHighDpiScaling::factor(screen);
+
+}
+
+// Any T that has operator*()
+template <typename T>
+T toNativePixels(const T &pointValue, const QWindow *window)
+{
+    if (!QHighDpiScaling::isActive())
+        return pointValue;
+
+    return pointValue * QHighDpiScaling::factor(window);
+}
+
+template <typename T>
+T toNativePixels(const T &pointValue, const QScreen *screen)
+{
+    if (!QHighDpiScaling::isActive())
+        return pointValue;
+
+    return pointValue * QHighDpiScaling::factor(screen);
+}
+
+
+// Any QVector<T> where T has operator/()
+template <typename T>
+QVector<T> fromNativePixels(const QVector<T> &pixelValues, const QWindow *window)
+{
+    if (!QHighDpiScaling::isActive())
+        return pixelValues;
+
+    QVector<T> pointValues;
+    foreach (const T& pixelValue, pixelValues)
+        pointValues.append(pixelValue / QHighDpiScaling::factor(window));
+    return pointValues;
+}
+
+// Any QVector<T> where T has operator*()
+template <typename T>
+QVector<T> toNativePixels(const QVector<T> &pointValues, const QWindow *window)
+{
+    if (!QHighDpiScaling::isActive())
+        return pointValues;
+
+    QVector<T> pixelValues;
+    foreach (const T& pointValue, pointValues)
+        pixelValues.append(pointValue * QHighDpiScaling::factor(window));
+    return pixelValues;
+}
+
+#if 0
+// Any QPair<T, U> where T and U has operator/()
+template <typename T, typename U>
+QPair<T, U> fromNativePixels(const QPair<T, U> &pixelPair, const QWindow *window)
+{
+    return qMakePair(fromNativePixels(pixelPair.first, window),
+                     fromNativePixels(pixelPair.second, window));
+}
+
+// Any QPair<T, U> where T and U has operator*()
+template <typename T, typename U>
+QPair<T, U> toNativePixels(const QPair<T, U> &pointPair, const QWindow *window)
+{
+    return qMakePair(QHighDpi::toNativePixels(pointPair.first, window),
+                     QHighDpi::toNativePixels(pointPair.second, window));
+}
+#endif
+}
+
+QT_END_NAMESPACE
+
+#endif