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diff --git a/src/plugins/platforms/xcb/nativepainting/qtessellator_p.h b/src/plugins/platforms/xcb/nativepainting/qtessellator_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTESSELATOR_P_H
+#define QTESSELATOR_P_H
+
+#include <QPoint>
+#include <QRect>
+
+QT_BEGIN_NAMESPACE
+
+class QTessellatorPrivate;
+
+typedef int Q27Dot5;
+#define Q27Dot5ToDouble(i) ((i)/32.)
+#define FloatToQ27Dot5(i) (int)((i) * 32)
+#define IntToQ27Dot5(i) ((i) << 5)
+#define Q27Dot5ToXFixed(i) ((i) << 11)
+#define Q27Dot5Factor 32
+
+class QTessellator {
+public:
+    QTessellator();
+    virtual ~QTessellator();
+
+    QRectF tessellate(const QPointF *points, int nPoints);
+    void tessellateConvex(const QPointF *points, int nPoints);
+    void tessellateRect(const QPointF &a, const QPointF &b, qreal width);
+
+    void setWinding(bool w);
+
+    struct Vertex {
+        Q27Dot5 x;
+        Q27Dot5 y;
+    };
+    struct Trapezoid {
+        Q27Dot5 top;
+        Q27Dot5 bottom;
+        const Vertex *topLeft;
+        const Vertex *bottomLeft;
+        const Vertex *topRight;
+        const Vertex *bottomRight;
+    };
+    virtual void addTrap(const Trapezoid &trap) = 0;
+
+private:
+    friend class QTessellatorPrivate;
+    QTessellatorPrivate *d;
+};
+
+QT_END_NAMESPACE
+
+#endif