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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 "FilterMask.h"
#include "Pixeldefs.h"
#include "../base/Exception.h"
#include <stdio.h>
namespace avg {
using namespace std;
FilterMask::FilterMask(BitmapPtr pMaskBmp)
: Filter(),
m_pMaskBmp(pMaskBmp)
{
AVG_ASSERT(m_pMaskBmp->getPixelFormat() == I8);
}
FilterMask::~FilterMask()
{
}
void FilterMask::applyInPlace(BitmapPtr pBmp)
{
IntPoint size = pBmp->getSize();
AVG_ASSERT(size == m_pMaskBmp->getSize());
for (int y = 0; y < size.y; y++) {
unsigned char * pMaskLine = m_pMaskBmp->getPixels()+y*m_pMaskBmp->getStride();
unsigned char * pLine = pBmp->getPixels()+y*pBmp->getStride();
switch (pBmp->getBytesPerPixel()) {
case 4:
for (int x = 0; x < size.x; x++) {
unsigned char src = *(pMaskLine+x);
unsigned char * pPixel = pLine + x*4;
*pPixel = (*pPixel*src)/255;
*(pPixel+1) = (*(pPixel+1)*src)/255;
*(pPixel+2) = (*(pPixel+2)*src)/255;
}
break;
case 3:
for (int x = 0; x < size.x; x++) {
unsigned char src = *(pMaskLine+x);
unsigned char * pPixel = pLine + x*3;
*pPixel = (*pPixel*src)/255;
*(pPixel+1) = (*(pPixel+1)*src)/255;
*(pPixel+2) = (*(pPixel+2)*src)/255;
}
break;
case 1:
for (int x = 0; x < size.x; x++) {
unsigned char src = *(pMaskLine+x);
unsigned char * pPixel = pLine + x;
*pPixel = (*pPixel*src)/255;
}
break;
default:
AVG_ASSERT(false);
}
}
}
}
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