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diff --git a/tests/auto/shared/highdpi.h b/tests/auto/shared/highdpi.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef HIGHDPI_H
+#define HIGHDPI_H
+
+#include <QtCore/qbytearray.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qrect.h>
+#include <QtCore/qsize.h>
+
+// Helpers for comparing geometries a that may go through scaling in the
+// platform plugin with fuzz (pass rounded-down device pixel ratios or
+// scaling factors). Error message for use with QVERIFY2() are also provided.
+
+class HighDpi
+{
+public:
+    HighDpi() = delete;
+    HighDpi(const HighDpi &) = delete;
+    HighDpi &operator=(const HighDpi &) = delete;
+    HighDpi(HighDpi &&) = delete;
+    HighDpi &operator=(HighDpi &&) = delete;
+    ~HighDpi() = delete;
+
+    static int manhattanDelta(const QPoint &p1, const QPoint p2)
+    {
+        return (p1 - p2).manhattanLength();
+    }
+
+    static bool fuzzyCompare(const QPoint &p1, const QPoint p2, int fuzz)
+    {
+        return manhattanDelta(p1, p2) <= fuzz;
+    }
+
+    static QByteArray msgPointMismatch(const QPoint &p1, const QPoint p2)
+    {
+        return QByteArray::number(p1.x()) + ',' + QByteArray::number(p1.y())
+                + " != " + QByteArray::number(p2.x()) + ',' + QByteArray::number(p2.y())
+                + ", manhattanLength=" + QByteArray::number(manhattanDelta(p1, p2));
+    }
+
+    // Compare a size that may go through scaling in the platform plugin with fuzz.
+
+    static inline int manhattanDelta(const QSize &s1, const QSize &s2)
+    {
+        return qAbs(s1.width() - s2.width()) + qAbs(s1.height() - s2.height());
+    }
+
+    static inline bool fuzzyCompare(const QSize &s1, const QSize &s2, int fuzz)
+    {
+        return manhattanDelta(s1, s2) <= fuzz;
+    }
+
+    static QByteArray msgSizeMismatch(const QSize &s1, const QSize &s2)
+    {
+        return QByteArray::number(s1.width()) + 'x' + QByteArray::number(s1.height())
+                + " != " + QByteArray::number(s2.width()) + 'x' + QByteArray::number(s2.height())
+                + ", manhattanLength=" + QByteArray::number(manhattanDelta(s1, s2));
+    }
+
+    // Compare a geometry that may go through scaling in the platform plugin with fuzz.
+
+    static inline bool fuzzyCompare(const QRect &r1, const QRect &r2, int fuzz)
+    {
+        return manhattanDelta(r1.topLeft(), r2.topLeft()) <= fuzz
+                && manhattanDelta(r1.size(), r2.size()) <= fuzz;
+    }
+
+    static QByteArray msgRectMismatch(const QRect &r1, const QRect &r2)
+    {
+        return formatRect(r1) + " != " + formatRect(r2);
+    }
+
+private:
+    static QByteArray formatRect(const QRect &r)
+    {
+        return QByteArray::number(r.width()) + 'x' + QByteArray::number(r.height())
+                + (r.left() < 0 ? '-' : '+') + QByteArray::number(r.left())
+                + (r.top() < 0 ? '-' : '+') + QByteArray::number(r.top());
+    }
+};
+
+#endif // HIGHDPI_H