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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 "FilterGetAlpha.h"
#include "Pixeldefs.h"
#include "../base/Exception.h"
#include <iostream>
namespace avg {
using namespace std;
FilterGetAlpha::FilterGetAlpha()
: Filter()
{
}
FilterGetAlpha::~FilterGetAlpha()
{
}
BitmapPtr FilterGetAlpha::apply(BitmapPtr pBmpSrc)
{
PixelFormat pf = pBmpSrc->getPixelFormat();
AVG_ASSERT(pf == R8G8B8A8 || pf == B8G8R8A8);
BitmapPtr pBmpDest = BitmapPtr(new Bitmap(pBmpSrc->getSize(), I8,
pBmpSrc->getName()+"alpha"));
unsigned char * pSrcLine = pBmpSrc->getPixels();
unsigned char * pDestLine = pBmpDest->getPixels();
IntPoint size = pBmpDest->getSize();
for (int y = 0; y < size.y; ++y) {
unsigned char * pSrcPixel = pSrcLine;
unsigned char * pDstPixel = pDestLine;
for (int x = 0; x < size.x; ++x) {
*pDstPixel = pSrcPixel[ALPHAPOS];
pSrcPixel += 4;
++pDstPixel;
}
pSrcLine = pSrcLine + pBmpSrc->getStride();
pDestLine = pDestLine + pBmpDest->getStride();
}
return pBmpDest;
}
}
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