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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
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