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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-07-18
* Description : Shear threaded image filter.
*
* Copyright (C) 2005-2008 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* Original Shear algorithms copyrighted 2005 by
* Pieter Z. Voloshyn <pieter dot voloshyn at gmail dot com>.
*
* 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.
*
* ============================================================ */
// Degrees to radian convertion coeff (PI/180). To optimize computation.
#define DEG2RAD 0.017453292519943
// C++ includes.
#include <cmath>
#include <cstdlib>
// Local includes.
#include "dimg.h"
#include "dimgimagefilters.h"
#include "shear.h"
namespace DigikamShearToolImagesPlugin
{
Shear::Shear(Digikam::DImg *orgImage, TQObject *parent, float hAngle, float vAngle,
bool antialiasing, TQColor backgroundColor, int orgW, int orgH)
: Digikam::DImgThreadedFilter(orgImage, parent, "sheartool")
{
m_hAngle = hAngle;
m_vAngle = vAngle;
m_orgW = orgW;
m_orgH = orgH;
m_antiAlias = antialiasing;
m_backgroundColor = backgroundColor;
initFilter();
}
void Shear::filterImage(void)
{
int progress;
int x, y, p = 0, pt;
int new_width, new_height;
double nx, ny, dx, dy;
double horz_factor, vert_factor;
double horz_add, vert_add;
double horz_beta_angle, vert_beta_angle;
int nWidth = m_orgImage.width();
int nHeight = m_orgImage.height();
uchar *pBits = m_orgImage.bits();
unsigned short *pBits16 = (unsigned short*)m_orgImage.bits();
// get beta ( complementary ) angle for horizontal and vertical angles
horz_beta_angle = ( ( ( m_hAngle < 0.0 ) ? 180.0 : 90.0 ) - m_hAngle ) * DEG2RAD;
vert_beta_angle = ( ( ( m_vAngle < 0.0 ) ? 180.0 : 90.0 ) - m_vAngle ) * DEG2RAD;
// get new distance for width and height values
horz_add = nHeight * ( ( m_hAngle < 0.0 ) ? sin( horz_beta_angle ) : cos( horz_beta_angle ) );
vert_add = nWidth * ( ( m_vAngle < 0.0 ) ? sin( vert_beta_angle ) : cos( vert_beta_angle ) );
// get absolute values for the distances
horz_add = fabs( horz_add );
vert_add = fabs( vert_add );
// get new image size ( original size + distance )
new_width = (int)horz_add + nWidth;
new_height = (int)vert_add + nHeight;
// get scale factor for width and height
horz_factor = horz_add / new_height;
vert_factor = vert_add / new_width;
// if horizontal angle is greater than zero...
// else, initial distance is equal to maximum distance ( in negative form )
if( m_hAngle > 0.0 )
{
// initial distance is zero and scale is negative ( to decrease )
dx = 0;
horz_factor *= -1.0;
}
else
{
dx = -horz_add;
}
// if vertical angle is greater than zero...
// else, initial distance is equal to maximum distance ( in negative form )
if( m_vAngle > 0.0 )
{
// initial distance is zero and scale is negative ( to decrease )
dy = 0;
vert_factor *= -1.0;
}
else
{
dy = -vert_add;
}
// allocates a new image with the new size
bool sixteenBit = m_orgImage.sixteenBit();
m_destImage = Digikam::DImg(new_width, new_height, sixteenBit, m_orgImage.hasAlpha());
m_destImage.fill( Digikam::DColor(m_backgroundColor.rgb(), sixteenBit) );
uchar *pResBits = m_destImage.bits();
unsigned short *pResBits16 = (unsigned short *)m_destImage.bits();
Digikam::DImgImageFilters filters;
for( y = 0; y < new_height; y++)
{
for( x = 0; x < new_width; x++, p += 4 )
{
// get new positions
nx = x + dx + y * horz_factor;
ny = y + dy + x * vert_factor;
// if is inside the source image
if (isInside (nWidth, nHeight, ROUND( nx ), ROUND( ny )))
{
if( m_antiAlias )
{
if (!sixteenBit)
filters.pixelAntiAliasing(pBits, nWidth, nHeight, nx, ny,
&pResBits[p+3], &pResBits[p+2],
&pResBits[p+1], &pResBits[p]);
else
filters.pixelAntiAliasing16(pBits16, nWidth, nHeight, nx, ny,
&pResBits16[p+3], &pResBits16[p+2],
&pResBits16[p+1], &pResBits16[p]);
}
else
{
pt = setPosition (nWidth, ROUND( nx ), ROUND( ny ));
for (int z = 0 ; z < 4 ; z++)
{
if (!sixteenBit)
pResBits[p+z] = pBits[pt+z];
else
pResBits16[p+z] = pBits16[pt+z];
}
}
}
}
// Update the progress bar in dialog.
progress = (int)(((double)y * 100.0) / new_height);
if (progress%5 == 0)
postProgress( progress );
}
// To compute the rotated destination image size using original image dimensions.
int W = (int)(fabs(m_orgH * ( ( m_hAngle < 0.0 ) ? sin( horz_beta_angle ) : cos( horz_beta_angle ))))+
m_orgW;
int H = (int)(fabs(m_orgW * ( ( m_vAngle < 0.0 ) ? sin( vert_beta_angle ) : cos( vert_beta_angle ))))+
m_orgH;
m_newSize.setWidth(W);
m_newSize.setHeight(H);
}
} // NameSpace DigikamShearToolImagesPlugin
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