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diff --git a/src/graphics/HistoryPreProcessor.h b/src/graphics/HistoryPreProcessor.h
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+++ b/src/graphics/HistoryPreProcessor.h
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+//
+//  libavg - Media Playback Engine. 
+//  Copyright (C) 2003-2014 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+//  Original author of this file is igor@c-base.org.
+//
+
+#ifndef _HistoryPreProcessor_H_
+#define _HistoryPreProcessor_H_
+
+#include "../api.h"
+#include "Filter.h"
+#include "Bitmap.h"
+
+#include <boost/shared_ptr.hpp>
+
+namespace avg {
+
+class AVG_API HistoryPreProcessor: public Filter
+{
+    public:
+        HistoryPreProcessor(IntPoint dimensions, unsigned int updateInterval, 
+                bool bBrighter);
+        virtual ~HistoryPreProcessor();
+        virtual void applyInPlace(BitmapPtr pBmp);
+        void setInterval(unsigned int updateInterval);
+        unsigned int getInterval(); 
+        void reset();
+
+    private:
+        HistoryPreProcessor(const HistoryPreProcessor&) {};
+        void updateHistory(BitmapPtr pNewBmp);
+        void normalizeHistogram(BitmapPtr pBmp, unsigned char Max);
+        template<int SPEED> void calcAvg(BitmapPtr pNewBmp); 
+
+        BitmapPtr m_pHistoryBmp;
+        unsigned int m_FrameCounter;
+        unsigned int m_UpdateInterval;
+        typedef enum {NO_IMAGE, INITIALIZING, NORMAL} State;
+        State m_State;
+        int m_NumInitImages;
+        bool m_bBrighter;
+};
+
+template<int SPEED>
+void HistoryPreProcessor::calcAvg(BitmapPtr pNewBmp)
+{
+    const int SRC_NUMERATOR = SPEED-1;
+    const int SRC_DENOMINATOR = SPEED;
+    const int DEST_FACTOR = 256/SPEED;
+    const unsigned char * pSrc = pNewBmp->getPixels();
+    unsigned short * pDest = (unsigned short*)(m_pHistoryBmp->getPixels());
+    int destStride = m_pHistoryBmp->getStride()/m_pHistoryBmp->getBytesPerPixel();
+    IntPoint size = m_pHistoryBmp->getSize();
+    for (int y = 0; y < size.y; y++) {
+        const unsigned char * pSrcPixel = pSrc;
+        unsigned short * pDestPixel = pDest;
+        for (int x = 0; x < size.x; x++) {
+            int t = SRC_NUMERATOR*int(*pDestPixel)/SRC_DENOMINATOR;
+            *pDestPixel = (t) + int(*pSrcPixel)*DEST_FACTOR;
+            pDestPixel++;
+            pSrcPixel++;
+        }
+        pDest += destStride;
+        pSrc += pNewBmp->getStride();
+    }
+
+}
+
+typedef boost::shared_ptr<HistoryPreProcessor> HistoryPreProcessorPtr;
+
+}
+#endif