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diff --git a/kbarcode/barkodeengine.h b/kbarcode/barkodeengine.h
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+/***************************************************************************
+                          barkodeengine.h  -  description
+                             -------------------
+    begin                : Fri Nov 05 2004
+    copyright            : (C) 2002 by Dominik Seichter
+    email                : domseichter@web.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef BARKODEENGINE_H
+#define BARKODEENGINE_H
+
+/**
+ * The different generator backends / engines
+ */
+typedef enum { GNU_BARCODE, PDF417, TBARCODE, TBARCODE2, PIXMAP, PURE_POSTSCRIPT, NONE } EEngine;
+
+class Barkode;
+class QDomElement;
+class QPainter;
+
+/** An interface for additional special options
+ *  supported by a BarkodeEngine
+ */
+class BarkodeEngineOptions {
+ public:
+    BarkodeEngineOptions() {};
+    virtual ~BarkodeEngineOptions() {};
+
+    virtual void defaults() = 0;
+
+    virtual void load( const QDomElement* tag ) = 0;
+    virtual void save( QDomElement* tag ) = 0;
+};
+
+#include <qsize.h>
+
+/**
+  * Inherit from this class if you want to create a
+  * (barkode engine) for use with KBarcode.
+  * @author Dominik Seichter
+  */
+class BarkodeEngine{
+    public:
+        BarkodeEngine();
+        virtual ~BarkodeEngine();
+
+        virtual const BarkodeEngine & operator=( const BarkodeEngine & rhs ) = 0;
+
+        virtual EEngine engine() const = 0;
+        virtual void update( const QPaintDevice* device ) = 0;
+        virtual const QSize size() const = 0;
+
+        void setBarkode( Barkode* b ) { barkode = b; }
+        virtual void drawBarcode(  QPainter & painter, int x, int y ) = 0;
+
+        /** @returns a pointer to a BarkodeEngineOptions object
+         *  if this BarkodeEngine has one. Otherwise null is returned.
+         *  The returned object has to be casted down to the concrete object
+         *  you want to use, before setting any of the options.
+         */
+        virtual BarkodeEngineOptions* options();
+
+    protected:
+        Barkode* barkode;
+        QSize m_size;
+        
+        bool m_valid;
+};
+
+/** A barcode engine with implemented empty and does
+  * nothing
+  */
+class EmptyEngine : public BarkodeEngine {
+    public:
+        EmptyEngine();
+
+        virtual inline const BarkodeEngine & operator=( const BarkodeEngine & rhs );
+        virtual inline EEngine engine() const;
+        virtual void update( const QPaintDevice* device );
+        virtual const QSize size() const;
+        virtual void drawBarcode(  QPainter & painter, int x, int y );
+};
+
+const BarkodeEngine & EmptyEngine::operator=( const BarkodeEngine & )
+{
+    return *this;
+}
+
+EEngine EmptyEngine::engine() const
+{
+    return NONE;
+}
+
+#endif