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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-05-25
* Description : lens distortion algorithm.
*
* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
* Copyright (C) 2001-2003 by David Hodson <hodsond@acm.org>
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation;
* either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* ============================================================ */
// C++ includes.
#include <cmath>
#include <cstdlib>
// Local includes.
#include "dimg.h"
#include "ddebug.h"
#include "pixelaccess.h"
#include "lensdistortion.h"
namespace DigikamLensDistortionImagesPlugin
{
LensDistortion::LensDistortion(Digikam::DImg *orgImage, QObject *parent, double main,
double edge, double rescale, double brighten,
int center_x, int center_y)
: Digikam::DImgThreadedFilter(orgImage, parent, "LensDistortion")
{
m_main = main;
m_edge = edge;
m_rescale = rescale;
m_brighten = brighten;
m_centre_x = center_x;
m_centre_y = center_y;
initFilter();
}
void LensDistortion::filterImage(void)
{
int Width = m_orgImage.width();
int Height = m_orgImage.height();
int bytesDepth = m_orgImage.bytesDepth();
uchar *data = m_destImage.bits();
// initial copy
m_destImage.bitBltImage(&m_orgImage, 0, 0);
// initialize coefficients
double normallise_radius_sq = 4.0 / (Width * Width + Height * Height);
double center_x = Width * (100.0 + m_centre_x) / 200.0;
double center_y = Height * (100.0 + m_centre_y) / 200.0;
double mult_sq = m_main / 200.0;
double mult_qd = m_edge / 200.0;
double rescale = pow(2.0, - m_rescale / 100.0);
double brighten = - m_brighten / 10.0;
PixelAccess *pa = new PixelAccess(&m_orgImage);
/*
* start at image (i, j), increment by (step, step)
* output goes to dst, which is w x h x d in size
* NB: d <= image.bpp
*/
// We are working on the full image.
int dstWidth = Width;
int dstHeight = Height;
uchar* dst = (uchar*)data;
int step = 1, progress;
int iLimit, jLimit;
double srcX, srcY, mag;
iLimit = dstWidth * step;
jLimit = dstHeight * step;
for (int dstJ = 0 ; !m_cancel && (dstJ < jLimit) ; dstJ += step)
{
for (int dstI = 0 ; !m_cancel && (dstI < iLimit) ; dstI += step)
{
// Get source Coordinates.
double radius_sq;
double off_x;
double off_y;
double radius_mult;
off_x = dstI - center_x;
off_y = dstJ - center_y;
radius_sq = (off_x * off_x) + (off_y * off_y);
radius_sq *= normallise_radius_sq;
radius_mult = radius_sq * mult_sq + radius_sq * radius_sq * mult_qd;
mag = radius_mult;
radius_mult = rescale * (1.0 + radius_mult);
srcX = center_x + radius_mult * off_x;
srcY = center_y + radius_mult * off_y;
brighten = 1.0 + mag * brighten;
pa->pixelAccessGetCubic(srcX, srcY, brighten, dst);
dst += bytesDepth;
}
// Update progress bar in dialog.
progress = (int) (((double)dstJ * 100.0) / jLimit);
if (m_parent && progress%5 == 0)
postProgress(progress);
}
delete pa;
}
} // NameSpace DigikamLensDistortionImagesPlugin
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