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diff --git a/src/libpcp_qwt/src/qwt_raster_data.h b/src/libpcp_qwt/src/qwt_raster_data.h
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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_RASTER_DATA_H
+#define QWT_RASTER_DATA_H 1
+
+#include "qwt_global.h"
+#include "qwt_interval.h"
+#include <qmap.h>
+#include <qlist.h>
+#include <qpolygon.h>
+
+class QwtScaleMap;
+
+/*!
+  \brief QwtRasterData defines an interface to any type of raster data.
+
+  QwtRasterData is an abstract interface, that is used by
+  QwtPlotRasterItem to find the values at the pixels of its raster.
+
+  Often a raster item is used to display values from a matrix. Then the
+  derived raster data class needs to implement some sort of resampling,
+  that maps the raster of the matrix into the requested raster of
+  the raster item ( depending on resolution and scales of the canvas ).
+*/
+class QWT_EXPORT QwtRasterData
+{
+public:
+    //! Contour lines
+    typedef QMap<double, QPolygonF> ContourLines;
+
+    //! Flags to modify the contour algorithm
+    enum ConrecFlag
+    {
+        //! Ignore all verices on the same level
+        IgnoreAllVerticesOnLevel = 0x01,
+
+        //! Ignore all values, that are out of range
+        IgnoreOutOfRange = 0x02
+    };
+
+    //! Flags to modify the contour algorithm
+    typedef QFlags<ConrecFlag> ConrecFlags;
+
+    QwtRasterData();
+    virtual ~QwtRasterData();
+
+    virtual void setInterval( Qt::Axis, const QwtInterval & );
+    const QwtInterval &interval(Qt::Axis) const;
+
+    virtual QRectF pixelHint( const QRectF & ) const;
+
+    virtual void initRaster( const QRectF &, const QSize& raster );
+    virtual void discardRaster();
+
+    /*!
+       \return the value at a raster position
+       \param x X value in plot coordinates
+       \param y Y value in plot coordinates
+    */
+    virtual double value( double x, double y ) const = 0;
+
+    virtual ContourLines contourLines( const QRectF &rect,
+        const QSize &raster, const QList<double> &levels,
+        ConrecFlags ) const;
+
+    class Contour3DPoint;
+    class ContourPlane;
+
+private:
+    // Disabled copy constructor and operator=
+    QwtRasterData( const QwtRasterData & );
+    QwtRasterData &operator=( const QwtRasterData & );
+
+    QwtInterval d_intervals[3];
+};
+
+/*!
+   \return Bounding interval for a axis
+   \sa setInterval
+*/
+inline const QwtInterval &QwtRasterData::interval( Qt::Axis axis) const
+{
+    return d_intervals[axis];
+}
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::ConrecFlags )
+
+#endif