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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
//
#include "FilterFastBandpass.h"
#include "FilterBlur.h"
#include "Filterfill.h"
#include "Pixel8.h"
#include "Bitmap.h"
#include "../base/Exception.h"
#include <cstring>
#include <iostream>
#include <sstream>
using namespace std;
namespace avg {
FilterFastBandpass::FilterFastBandpass()
{
}
FilterFastBandpass::~FilterFastBandpass()
{
}
BitmapPtr FilterFastBandpass::apply(BitmapPtr pBmpSrc)
{
AVG_ASSERT(pBmpSrc->getPixelFormat() == I8);
BitmapPtr pBmpDest = BitmapPtr(new Bitmap(pBmpSrc->getSize(), I8,
pBmpSrc->getName()));
int srcStride = pBmpSrc->getStride();
int destStride = pBmpDest->getStride();
unsigned char * pSrcLine = pBmpSrc->getPixels()+3*srcStride;
unsigned char * pDestLine = pBmpDest->getPixels()+3*destStride;
IntPoint size = pBmpDest->getSize();
for (int y = 3; y < size.y-3; ++y) {
unsigned char * pSrcPixel = pSrcLine+3;
unsigned char * pDstPixel = pDestLine;
*pDstPixel++ = 128;
*pDstPixel++ = 128;
*pDstPixel++ = 128;
for (int x = 3; x < size.x-3; ++x) {
// Convolution Matrix is
// 0 0 0 0 0 0 0
// 0 -2 0 0 0 -2 0
// 0 0 1 0 1 0 0
// 0 0 0 4 0 0 0
// 0 0 1 0 1 0 0
// 0 -2 0 0 0 -2 0
// 0 0 0 0 0 0 0
*pDstPixel = 128
- int(*(pSrcPixel-2*srcStride-2)*2 + *(pSrcPixel-2*srcStride+2)*2 -
*(pSrcPixel-srcStride-1) - *(pSrcPixel-1*srcStride+1) -
*(pSrcPixel+srcStride-1) - *(pSrcPixel+1*srcStride+1) +
*(pSrcPixel+2*srcStride-2)*2 + *(pSrcPixel+2*srcStride+2)*2+2)/4
+ *pSrcPixel;
++pSrcPixel;
++pDstPixel;
}
*pDstPixel++ = 128;
*pDstPixel++ = 128;
*pDstPixel++ = 128;
pSrcLine += srcStride;
pDestLine += destStride;
}
// Set top and bottom borders.
memset(pBmpDest->getPixels(), 128, destStride*3);
memset(pBmpDest->getPixels()+destStride*(size.y-3), 128, destStride*3);
return pBmpDest;
}
}
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