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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
//
// Original author of this file is igor@c-base.org.
//
#include "FilterDistortion.h"
#include <iostream>
#include <math.h>
using namespace std;
namespace avg {
FilterDistortion::FilterDistortion(const IntPoint& srcSize,
CoordTransformerPtr pTransformer)
: m_SrcSize(srcSize),
m_pTransformer(pTransformer)
{
// We use the same dimensions for both of src and dest and just crop.
// for each pixel at (x,y) in the dest, m_pMap[x][y] contains an IntPoint that gives
// the coords in the src Bitmap.
m_pMap = new IntPoint[m_SrcSize.y*m_SrcSize.x];
for (int y = 0; y < m_SrcSize.y; ++y) {
for (int x = 0; x < m_SrcSize.x; ++x) {
glm::dvec2 tmp = m_pTransformer->inverse_transform_point(glm::dvec2(x,y));
IntPoint tmp2(int(tmp.x+0.5),int(tmp.y+0.5));
if (tmp2.x < m_SrcSize.x && tmp2.y < m_SrcSize.y &&
tmp2.x >= 0 && tmp2.y >= 0)
{
m_pMap[y*m_SrcSize.x+x] = tmp2;
} else {
m_pMap[y*m_SrcSize.x+x] = IntPoint(0,0);
}
}
}
}
FilterDistortion::~FilterDistortion()
{
delete[] m_pMap;
}
BitmapPtr FilterDistortion::apply(BitmapPtr pBmpSource)
{
BitmapPtr pDestBmp = BitmapPtr(new Bitmap(m_SrcSize, I8));
unsigned char* pDestLine = pDestBmp->getPixels();
unsigned char* pSrcPixels = pBmpSource->getPixels();
unsigned char* pDestPixel = pDestLine;
int destStride = pDestBmp->getStride();
int srcStride = pBmpSource->getStride();
IntPoint * pMapPos = m_pMap;
for (int y = 0; y < m_SrcSize.y; ++y) {
for(int x = 0; x < m_SrcSize.x; ++x) {
*pDestPixel = pSrcPixels[pMapPos->x + srcStride*pMapPos->y];
pDestPixel++;
pMapPos++;
}
pDestLine+=destStride;
pDestPixel = pDestLine;
}
return pDestBmp;
}
}
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