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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 _FilterConvol_H
#define _FilterConvol_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.
template<class Pixel>
class AVG_API FilterConvol : public Filter
{
public:
FilterConvol(float *Mat,int n,int m, int offset=0);
virtual ~FilterConvol();
virtual BitmapPtr apply(BitmapPtr pBmpSource);
private:
void convolveLine(const unsigned char* pSrc, unsigned char* pDest,
int lineLen, int stride, int offset = 0) const;
int m_N;
int m_M;
int m_Offset;
float *m_Mat;
};
template <class Pixel>
void FilterConvol<Pixel>::convolveLine(const unsigned char* pSrc, unsigned char* pDest,
int lineLen, int stride, int offset) 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<m_N; i++) {
for (int j=0; j<m_N; j++) {
unsigned char * pLineStart = (unsigned char *)pSrcPixel+i*stride;
Pixel SrcPixel = *((Pixel *)pLineStart+j);
NewR += SrcPixel.getR()*m_Mat[m_N*i+j];
NewG += SrcPixel.getG()*m_Mat[m_N*i+j];
NewB += SrcPixel.getB()*m_Mat[m_N*i+j];
}
}
*pDestPixel = Pixel((unsigned char)(NewR+offset), (unsigned char)(NewG+offset),
(unsigned char)(NewB+offset));
pSrcPixel++;
pDestPixel++;
}
}
template <>
void FilterConvol<Pixel8>::convolveLine(const unsigned char* pSrc, unsigned char* pDest,
int lineLen, int stride, int offset) const
{
Pixel8 * pSrcPixel = (Pixel8 *)pSrc;
Pixel8 * pDestPixel = (Pixel8 *)pDest;
for (int x=0; x<lineLen; ++x) {
float New = 0;
for (int i=0; i<m_N; i++) {
for (int j=0; j<m_N; j++) {
unsigned char * pLineStart = (unsigned char *)pSrcPixel+i*stride;
Pixel8 SrcPixel = *((Pixel8 *)pLineStart+j);
New += SrcPixel.get()*m_Mat[m_N*i+j];
}
}
*pDestPixel = Pixel8((unsigned char)(New+offset));
pSrcPixel++;
pDestPixel++;
}
}
template <class Pixel>
FilterConvol<Pixel>::FilterConvol(float *Mat, int n, int m, int offset)
: Filter(),
m_N(n),
m_M(m),
m_Offset(offset)
{
m_Mat = new float[n*m];
for (int y=0; y<n; y++) {
for (int x=0; x<m; x++) {
m_Mat[m_N*y+x] = Mat[m_N*y+x];
}
}
}
template <class Pixel>
FilterConvol<Pixel>::~FilterConvol()
{
delete[] m_Mat;
}
template <class Pixel>
BitmapPtr FilterConvol<Pixel>::apply(BitmapPtr pBmpSource)
{
IntPoint NewSize(pBmpSource->getSize().x-m_N+1, pBmpSource->getSize().y-m_M+1);
BitmapPtr pNewBmp(new Bitmap(NewSize, pBmpSource->getPixelFormat(),
pBmpSource->getName()+"_filtered"));
for (int y = 0; y < NewSize.y; y++) {
const unsigned char * pSrc = pBmpSource->getPixels()+y*pBmpSource->getStride();
unsigned char * pDest = pNewBmp->getPixels()+y*pNewBmp->getStride();
convolveLine(pSrc, pDest, NewSize.x, pBmpSource->getStride(), m_Offset);
}
return pNewBmp;
}
}
#endif
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