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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
//
#ifndef _Filter3x3_H
#define _Filter3x3_H
#include "../api.h"
#include "Filter.h"
#include "Pixel8.h"
#include "Pixel24.h"
#include "Pixel32.h"
#include <iostream>
namespace avg {
// Filter that applies a 3x3 kernel to the bitmap.
class AVG_API Filter3x3 : public Filter
{
public:
Filter3x3(float Mat[3][3]);
virtual ~Filter3x3();
virtual BitmapPtr apply(BitmapPtr pBmpSource);
private:
template<class PIXEL>
void convolveLine(const unsigned char * pSrc, unsigned char * pDest,
int lineLen, int stride) const;
float m_Mat[3][3];
};
template<class PIXEL>
void Filter3x3::convolveLine(const unsigned char * pSrc, unsigned char * pDest,
int lineLen, int stride) const
{
PIXEL * pSrcPixel = (PIXEL *)pSrc;
PIXEL * pDestPixel = (PIXEL *)pDest;
for (int x = 0; x < lineLen; ++x) {
float newR = 0;
float newG = 0;
float newB = 0;
for (int i = 0; i < 3; i++) {
unsigned char * pLineStart = (unsigned char *)pSrcPixel+i*stride;
for (int j = 0; j < 3; j++) {
PIXEL SrcPixel = *((PIXEL *)pLineStart+j);
newR += SrcPixel.getR()*m_Mat[i][j];
newG += SrcPixel.getG()*m_Mat[i][j];
newB += SrcPixel.getB()*m_Mat[i][j];
}
}
*pDestPixel = PIXEL((unsigned char)newR, (unsigned char)newG,
(unsigned char)newB);
pSrcPixel++;
pDestPixel++;
}
}
}
#endif
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