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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 "FilterDilation.h"
#include "../base/Exception.h"
#include <algorithm>
using namespace std;
namespace avg {
FilterDilation::FilterDilation()
: Filter()
{
}
FilterDilation::~FilterDilation()
{
}
BitmapPtr FilterDilation::apply(BitmapPtr pSrcBmp)
{
AVG_ASSERT(pSrcBmp->getPixelFormat() == I8);
IntPoint size = pSrcBmp->getSize();
BitmapPtr pDestBmp = BitmapPtr(new Bitmap(size, I8, pSrcBmp->getName()));
unsigned char * pSrcLine = pSrcBmp->getPixels();
unsigned char * pNextSrcLine;
unsigned char * pDestLine = pDestBmp->getPixels();
for (int y = 0; y < size.y; y++) {
pDestLine = pDestBmp->getPixels()+y*pDestBmp->getStride();
unsigned char * pLastSrcLine = pSrcLine;
pSrcLine = pSrcBmp->getPixels()+y*pSrcBmp->getStride();
if (y < size.y-1) {
pNextSrcLine = pSrcBmp->getPixels()+(y+1)*pSrcBmp->getStride();
} else {
pNextSrcLine = pSrcBmp->getPixels()+y*pSrcBmp->getStride();
}
pDestLine[0] = max(pSrcLine[0], max(pSrcLine[1],
max(pLastSrcLine[0], pNextSrcLine[0])));
for (int x = 1; x < size.x-1; x++) {
pDestLine[x] = max(pSrcLine[x], max(pSrcLine[x-1], max(pSrcLine[x+1],
max(pLastSrcLine[x], pNextSrcLine[x]))));
}
pDestLine[size.x-1] = max(pSrcLine[size.x-2], max(pSrcLine[size.x-1],
max(pLastSrcLine[size.x-1], pNextSrcLine[size.x-1])));
}
return pDestBmp;
}
} // namespace
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