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203 | /* ============================================================
*
* This file is a part of digiKam project
* https://www.digikam.org
*
* Date : 2019-09-21
* Description : JPEG DImg plugin.
*
* SPDX-FileCopyrightText: 2020-2025 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* ============================================================ */
#include "dimgjpegplugin.h"
// Qt includes
#include <QFile>
// KDE includes
#include <klocalizedstring.h>
// Local includes
#include "digikam_debug.h"
#include "digikam_config.h"
#include "digikam_globals.h"
#include "dimgjpegloader.h"
#include "dimgjpegexportsettings.h"
namespace DigikamJPEGDImgPlugin
{
DImgJPEGPlugin::DImgJPEGPlugin(QObject* const parent)
: DPluginDImg(parent)
{
}
QString DImgJPEGPlugin::name() const
{
return i18nc("@title", "JPEG loader");
}
QString DImgJPEGPlugin::iid() const
{
return QLatin1String(DPLUGIN_IID);
}
QIcon DImgJPEGPlugin::icon() const
{
return QIcon::fromTheme(QLatin1String("image-jpeg"));
}
QString DImgJPEGPlugin::description() const
{
return i18nc("@info", "An image loader based on Libjpeg codec");
}
QString DImgJPEGPlugin::details() const
{
return xi18nc("@info", "<para>This plugin allows users to load and save image using Libjpeg codec.</para>"
"<para>Joint Photographic Experts Group (JPEG) is a commonly used method of lossy "
"compression for digital images, particularly for those images produced by "
"digital photography. The degree of compression can be adjusted, allowing "
"a selectable tradeoff between storage size and image quality.</para>"
"<para>See <a href='https://en.wikipedia.org/wiki/JPEG'>"
"Joint Photographic Experts Group documentation</a> for details.</para>"
);
}
QString DImgJPEGPlugin::handbookSection() const
{
return QLatin1String("supported_materials");
}
QString DImgJPEGPlugin::handbookChapter() const
{
return QLatin1String("image_formats");
}
QString DImgJPEGPlugin::handbookReference() const
{
return QLatin1String("image-jpeg");
}
QList<DPluginAuthor> DImgJPEGPlugin::authors() const
{
return QList<DPluginAuthor>()
<< DPluginAuthor(QString::fromUtf8("Renchi Raju"),
QString::fromUtf8("renchi dot raju at gmail dot com"),
QString::fromUtf8("(C) 2005"))
<< DPluginAuthor(QString::fromUtf8("Gilles Caulier"),
QString::fromUtf8("caulier dot gilles at gmail dot com"),
QString::fromUtf8("(C) 2006-2024"))
;
}
void DImgJPEGPlugin::setup(QObject* const /*parent*/)
{
// Nothing to do
}
QString DImgJPEGPlugin::loaderName() const
{
return QLatin1String("JPEG");
}
QString DImgJPEGPlugin::typeMimes() const
{
return QLatin1String("JPG JPEG JPE");
}
QMap<QString, QStringList> DImgJPEGPlugin::extraAboutData() const
{
QMap<QString, QStringList> map;
map.insert(QLatin1String("JPG"), QStringList() << i18nc("@title", "JPEG image")
<< i18nc("@info: can read file format", "yes")
<< i18nc("@info: can write file format", "yes")
);
map.insert(QLatin1String("JPEG"), QStringList() << i18nc("@title", "JPEG image")
<< i18nc("@info: can read file format", "yes")
<< i18nc("@info: can write file format", "yes")
);
map.insert(QLatin1String("JPE"), QStringList() << i18nc("@title", "JPEG image")
<< i18nc("@info: can read file format", "yes")
<< i18nc("@info: can write file format", "yes")
);
return map;
}
int DImgJPEGPlugin::canRead(const QFileInfo& fileInfo, bool magic) const
{
QString filePath = fileInfo.filePath();
QString format = fileInfo.suffix().toUpper();
// First simply check file extension
if (!magic)
{
return (!format.isEmpty() && typeMimes().contains(format)) ? 10 : 0;
}
// In second, we trying to parse file header.
QFile file(filePath);
if (!file.open(QIODevice::ReadOnly))
{
qCDebug(DIGIKAM_DIMG_LOG) << "Failed to open file " << filePath;
return 0;
}
const qint64 headerLen = 9;
QByteArray header(headerLen, '\0');
if (file.read((char*)header.data(), headerLen) != headerLen)<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
{
qCDebug(DIGIKAM_DIMG_LOG) << "Failed to read header of file " << filePath;
return 0;
}
const uchar jpegID[2] = { 0xFF, 0xD8 };
if (memcmp(header.data(), &jpegID, 2) == 0)
{
return 10;
}
return 0;
}
int DImgJPEGPlugin::canWrite(const QString& format) const
{
return typeMimes().contains(format.toUpper()) ? 10 : 0;
}
DImgLoader* DImgJPEGPlugin::loader(DImg* const image, const DRawDecoding&) const
{
return new DImgJPEGLoader(image);
}
DImgLoaderSettings* DImgJPEGPlugin::exportWidget(const QString& format) const
{
if (canWrite(format))
{
return (new DImgJPEGExportSettings());
}
return nullptr;
}
} // namespace DigikamJPEGDImgPlugin
#include "moc_dimgjpegplugin.cpp"
|