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/** ===========================================================
* @file
*
* This file is a part of digiKam project
* <a href="http://www.digikam.org">http://www.digikam.org</a>
*
* @date 2012-06-01
* @brief Transitions, AspectRatioCorrection and otherImageEffects
*
* @author Copyright (C) 2012 by A Janardhan Reddy <annapareddyjanardhanreddy at gmail dot com>
* Copyright (C) 2012 by Gilles Caulier <caulier dot gilles 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.
*
* ============================================================ */
#include "processimage.moc"
// C++ includes
#include <cmath>
// Local includes
#include "magickiface.h"
#define INC(v) incValue(v, step, steps)
#define DEC(v) decValue(v, step, steps)
namespace KIPIPlugins
{
ProcessImage::ProcessImage(MagickApi* const api)
{
m_api = api;
}
MagickImage* ProcessImage::aspectRatioCorrection(MagickImage& img, double aspectratio, ASPECTCORRECTION_TYPE aspectcorrection)
{
MagickImage* newimg = 0;
double img_aspectratio = (double) img.getWidth() / (double) img.getHeight();
// tolerate some error in double value
if(abs(img_aspectratio - aspectratio) <= 0.001)
return &img;
if (aspectcorrection == ASPECTCORRECTION_TYPE_AUTO)
{
// find out whether we should use fitin, fillin or none
if (img_aspectratio > 1.0)
aspectcorrection = ASPECTCORRECTION_TYPE_FILLIN;
else
aspectcorrection = ASPECTCORRECTION_TYPE_FITIN;
}
switch (aspectcorrection)
{
case ASPECTCORRECTION_TYPE_FITIN:
//fit in with black bars
if (img_aspectratio < aspectratio)
{
// resulting image will have black bars on right and left side
if (!(newimg = m_api->createImage("black", img.getHeight() * aspectratio,img.getHeight())))
Q_EMIT signalProcessError("couldn't create image\n");
m_api->overlayImage(*newimg, (newimg->getWidth() - img.getWidth()) / 2,0, img);
}
else
{
// resulting image will have black bars on top and bottom
if (!(newimg = m_api->createImage("black", img.getHeight() * aspectratio, img.getHeight())))
Q_EMIT signalProcessError("couldn't create image\n");
m_api->overlayImage(*newimg, 0, (newimg->getHeight() - img.getHeight()) / 2, img);
}
break;
case ASPECTCORRECTION_TYPE_FILLIN:
// part of image is cut off
if (img_aspectratio < aspectratio)
{
// cut on top and bottom side
if (!(newimg = m_api->createImage("black", img.getHeight() * aspectratio, img.getHeight())))
Q_EMIT signalProcessError("couldn't create image\n");
m_api->bitblitImage(*newimg, 0, 0, img, 0, (img.getHeight() - newimg->getHeight()) / 2, newimg->getWidth(), newimg->getHeight());
}
else
{
// cut on right and left side
if (!(newimg = m_api->createImage("black", img.getHeight() * aspectratio, img.getHeight())))
Q_EMIT signalProcessError("couldn't create image\n");
m_api->bitblitImage(*newimg, 0, 0, img,(img.getWidth() - newimg->getWidth()) / 2,0, newimg->getWidth(), newimg->getHeight());
}
break;
case ASPECTCORRECTION_TYPE_NONE:
default:
// no correction needed
break;
}
if (newimg)
{
// swap the images if we got a new one
m_api->freeImage(img);
img = *newimg;
}
return &img;
}
int ProcessImage::incValue(int v, int step, int steps) const
{
return (v) * (step + 1) / steps;
}
int ProcessImage::decValue(int v, int step, int steps) const
{
return (v) * (steps - step - 1) / steps;
}
MagickImage* ProcessImage::transition(const MagickImage& from, const MagickImage& to, int type, int step, int steps)
{
int w, h;
if (step < 0 || step >= steps)
Q_EMIT signalProcessError(QString("step: %1 is out of range (%2)").arg(step).arg(steps));
// create a new target image and copy the from image onto
MagickImage* const dst = m_api->createImage("black", w = from.getWidth(), h = from.getHeight());
switch (type)
{
// sliding
case TRANSITION_TYPE_SLIDE_L2R:
m_api->overlayImage(*dst, 0, 0, from);
m_api->overlayImage(*dst, DEC(-w), 0, to);
break;
case TRANSITION_TYPE_SLIDE_R2L:
m_api->overlayImage(*dst, 0, 0, from);
m_api->overlayImage(*dst, DEC(w), 0, to);
break;
case TRANSITION_TYPE_SLIDE_T2B:
m_api->overlayImage(*dst, 0, 0, from);
m_api->overlayImage(*dst, 0, DEC(-h), to);
break;
case TRANSITION_TYPE_SLIDE_B2T:
m_api->overlayImage(*dst, 0, 0, from);
m_api->overlayImage(*dst, 0, DEC(h), to);
break;
// pushing
case TRANSITION_TYPE_PUSH_L2R:
m_api->overlayImage(*dst, INC(w), 0, from);
m_api->overlayImage(*dst, DEC(-w), 0, to);
break;
case TRANSITION_TYPE_PUSH_R2L:
m_api->overlayImage(*dst, INC(-w), 0, from);
m_api->overlayImage(*dst, DEC(w), 0, to);
break;
case TRANSITION_TYPE_PUSH_T2B:
m_api->overlayImage(*dst, 0, INC(h), from);
m_api->overlayImage(*dst, 0, DEC(-h), to);
break;
case TRANSITION_TYPE_PUSH_B2T:
m_api->overlayImage(*dst, 0, INC(-h), from);
m_api->overlayImage(*dst, 0, DEC(h), to);
break;
// swapping
case TRANSITION_TYPE_SWAP_L2R:
if (step < steps / 2)
{
m_api->overlayImage(*dst, INC(w), 0, to);
m_api->overlayImage(*dst, INC(-w), 0, from);
}
else
{
m_api->overlayImage(*dst, DEC(-w), 0, from);
m_api->overlayImage(*dst, DEC(w), 0, to);
}
break;
case TRANSITION_TYPE_SWAP_R2L:
if (step < steps / 2)
{
m_api->overlayImage(*dst, INC(-w), 0, to);
m_api->overlayImage(*dst, INC(w), 0, from);
}
else
{
m_api->overlayImage(*dst, DEC(w), 0, from);
m_api->overlayImage(*dst, DEC(-w), 0, to);
}
break;
case TRANSITION_TYPE_SWAP_T2B:
if (step < steps / 2)
{
m_api->overlayImage(*dst, 0, INC(h), to);
m_api->overlayImage(*dst, 0, INC(-h), from);
}
else
{
m_api->overlayImage(*dst, 0, DEC(-h), from);
m_api->overlayImage(*dst, 0, DEC(h), to);
}
break;
case TRANSITION_TYPE_SWAP_B2T:
if (step < steps / 2)
{
m_api->overlayImage(*dst, 0, INC(-h), to);
m_api->overlayImage(*dst, 0, INC(h), from);
}
else
{
m_api->overlayImage(*dst, 0, DEC(h), from);
m_api->overlayImage(*dst, 0, DEC(-h), to);
}
break;
// rolling
case TRANSITION_TYPE_ROLL_L2R:
if (INC(w))
m_api->scaleblitImage(*dst, 0, 0, INC(w), h, to, 0, 0, w, h);
if (DEC(w))
m_api->scaleblitImage(*dst, INC(w), 0, DEC(w), h, from, 0, 0, w, h);
break;
case TRANSITION_TYPE_ROLL_R2L:
if (DEC(w))
m_api->scaleblitImage(*dst, 0, 0, DEC(w), h, from, 0, 0, w, h);
if (INC(w))
m_api->scaleblitImage(*dst, DEC(w), 0, INC(w), h, to, 0, 0, w, h);
break;
case TRANSITION_TYPE_ROLL_T2B:
if (INC(h))
m_api->scaleblitImage(*dst, 0, 0, w, INC(h), to, 0, 0, w, h);
if (DEC(h))
m_api->scaleblitImage(*dst, 0, INC(h), w, DEC(h), from, 0, 0, w, h);
break;
case TRANSITION_TYPE_ROLL_B2T:
if (DEC(h))
m_api->scaleblitImage(*dst, 0, 0, w, DEC(h), from, 0, 0, w, h);
if (INC(h))
m_api->scaleblitImage(*dst, 0, DEC(h), w, INC(h), to, 0, 0, w, h);
break;
// fade
case TRANSITION_TYPE_FADE:
default:
m_api->blendImage(*dst, from, to, 1.0 / steps * step);
break;
}
return dst;
}
GeoImage* ProcessImage::getGeometry(const GeoImage& from, const GeoImage& to, int image_width, int image_height,
int step, int steps) const
{
GeoImage* const geometry = new GeoImage();
// compute the dimesions in current step
steps--;
if (step <= 0)
{
geometry->x = lround(from.x);
geometry->y = lround(from.y);
geometry->w = lround(from.w);
geometry->h = lround(from.h);
}
else if (step >= steps)
{
geometry->x = lround(to.x);
geometry->y = lround(to.y);
geometry->w = lround(to.w);
geometry->h = lround(to.h);
}
else
{
geometry->x = lround(from.x + (to.x - from.x) * (double) step / (double) steps);
geometry->y = lround(from.y + (to.y - from.y) * (double) step / (double) steps);
geometry->w = lround(from.w + (to.w - from.w) * (double) step / (double) steps);
geometry->h = lround(from.h + (to.h - from.h) * (double) step / (double) steps);
}
geometry->x = qMin(qMax(geometry->x, 0), image_width - 1);
geometry->y = qMin(qMax(geometry->y, 0), image_height - 1);
geometry->w = qMin(qMax(geometry->w, 0), image_width - 1 - geometry->x);
geometry->h = qMin(qMax(geometry->h, 0), image_height - 1 - geometry->y);
return geometry;
}
} // namespace KIPIPlugins
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