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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2007-08-02
* Description : save JPEG image options.
*
* Copyright (C) 2007 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.
*
* ============================================================ */
// TQt includes.
#include <tqstring.h>
#include <tqlabel.h>
#include <tqlayout.h>
#include <tqwhatsthis.h>
#include <tqcombobox.h>
// KDE includes.
#include <klocale.h>
#include <kdialog.h>
#include <knuminput.h>
#include <kactivelabel.h>
// Local includes.
#include "jpegsettings.h"
#include "jpegsettings.moc"
namespace Digikam
{
class JPEGSettingsPriv
{
public:
JPEGSettingsPriv()
{
JPEGGrid = 0;
labelJPEGcompression = 0;
JPEGcompression = 0;
labelWarning = 0;
labelSubSampling = 0;
subSamplingCB = 0;
}
TQGridLayout *JPEGGrid;
TQLabel *labelJPEGcompression;
TQLabel *labelSubSampling;
TQComboBox *subSamplingCB;
KActiveLabel *labelWarning;
KIntNumInput *JPEGcompression;
};
JPEGSettings::JPEGSettings(TQWidget *parent)
: TQWidget(parent, 0, TQt::WDestructiveClose)
{
d = new JPEGSettingsPriv;
d->JPEGGrid = new TQGridLayout(this, 1, 2, KDialog::spacingHint());
d->JPEGcompression = new KIntNumInput(75, this);
d->JPEGcompression->setRange(1, 100, 1, true );
d->labelJPEGcompression = new TQLabel(i18n("JPEG quality:"), this);
TQWhatsThis::add(d->JPEGcompression, i18n("<p>The JPEG image quality:<p>"
"<b>1</b>: low quality (high compression and small "
"file size)<p>"
"<b>50</b>: medium quality<p>"
"<b>75</b>: good quality (default)<p>"
"<b>100</b>: high quality (no compression and "
"large file size)<p>"
"<b>Note: JPEG always uses lossy compression.</b>"));
d->labelWarning = new KActiveLabel(i18n("<qt><font size=-1 color=\"red\"><i>"
"Warning: <a href='http://en.wikipedia.org/wiki/JPEG'>JPEG</a> is a<br>"
"lossy compression<br>"
"image format!</p>"
"</i></qt>"), this);
d->labelWarning->setFrameStyle(TQFrame::Box | TQFrame::Plain);
d->labelWarning->setLineWidth(1);
d->labelWarning->setFrameShape(TQFrame::Box);
d->labelSubSampling = new TQLabel(i18n("Chroma subsampling:"), this);
d->subSamplingCB = new TQComboBox(false, this);
d->subSamplingCB->insertItem(i18n("None")); // 1x1, 1x1, 1x1 (4:4:4)
d->subSamplingCB->insertItem(i18n("Medium")); // 2x1, 1x1, 1x1 (4:2:2)
d->subSamplingCB->insertItem(i18n("High")); // 2x2, 1x1, 1x1 (4:1:1)
TQWhatsThis::add(d->subSamplingCB, i18n("<p>JPEG Chroma subsampling level \n(color is saved with less resolution " "than luminance):<p>"
"<b>None</b>=best: uses 4:4:4 ratio. Does not employ chroma "
"subsampling at all. This preserves edges and contrasting "
"colors, whilst adding no additional compression<p>"
"<b>Medium</b>: uses 4:2:2 ratio. Medium compression: reduces "
"the color resolution by one-third with little to "
"no visual difference<p>"
"<b>High</b>: use 4:1:1 ratio. High compression: suits "
"images with soft edges but tends to alter colors<p>"
"<b>Note: JPEG always uses lossy compression.</b>"));
d->JPEGGrid->addMultiCellWidget(d->labelJPEGcompression, 0, 0, 0, 0);
d->JPEGGrid->addMultiCellWidget(d->JPEGcompression, 0, 0, 1, 1);
d->JPEGGrid->addMultiCellWidget(d->labelSubSampling, 1, 1, 0, 0);
d->JPEGGrid->addMultiCellWidget(d->subSamplingCB, 1, 1, 1, 1);
d->JPEGGrid->addMultiCellWidget(d->labelWarning, 0, 1, 2, 2);
d->JPEGGrid->setColStretch(1, 10);
d->JPEGGrid->setRowStretch(2, 10);
}
JPEGSettings::~JPEGSettings()
{
delete d;
}
void JPEGSettings::setCompressionValue(int val)
{
d->JPEGcompression->setValue(val);
}
int JPEGSettings::getCompressionValue()
{
return d->JPEGcompression->value();
}
void JPEGSettings::setSubSamplingValue(int val)
{
d->subSamplingCB->setCurrentItem(val);
}
int JPEGSettings::getSubSamplingValue()
{
return d->subSamplingCB->currentItem();
}
} // namespace Digikam
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