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188 | /* ============================================================
*
* This file is a part of digiKam project
* https://www.digikam.org
*
* Date : 2019-09-22
* Description : PNG 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 "dimgpngplugin.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 "dimgpngloader.h"
#include "dimgpngexportsettings.h"
namespace DigikamPNGDImgPlugin
{
DImgPNGPlugin::DImgPNGPlugin(QObject* const parent)
: DPluginDImg(parent)
{
}
QString DImgPNGPlugin::name() const
{
return i18nc("@title", "PNG loader");
}
QString DImgPNGPlugin::iid() const
{
return QLatin1String(DPLUGIN_IID);
}
QIcon DImgPNGPlugin::icon() const
{
return QIcon::fromTheme(QLatin1String("image-png"));
}
QString DImgPNGPlugin::description() const
{
return i18nc("@info", "An image loader based on Libpng codec");
}
QString DImgPNGPlugin::details() const
{
return xi18nc("@info", "<para>This plugin allows users to load and save image using Libpng codec.</para>"
"<para>Portable Network Graphics (PNG) is a raster-graphics file-format that supports "
"lossless data compression. PNG was developed as an improved, non-patented replacement "
"for Graphics Interchange Format.</para>"
"<para>See <a href='https://en.wikipedia.org/wiki/Portable_Network_Graphics'>"
"Portable Network Graphics documentation</a> for details.</para>"
);
}
QString DImgPNGPlugin::handbookSection() const
{
return QLatin1String("supported_materials");
}
QString DImgPNGPlugin::handbookChapter() const
{
return QLatin1String("image_formats");
}
QString DImgPNGPlugin::handbookReference() const
{
return QLatin1String("image-png");
}
QList<DPluginAuthor> DImgPNGPlugin::authors() const
{
return QList<DPluginAuthor>()
<< DPluginAuthor(QString::fromUtf8("Gilles Caulier"),
QString::fromUtf8("caulier dot gilles at gmail dot com"),
QString::fromUtf8("(C) 2005-2024"))
;
}
void DImgPNGPlugin::setup(QObject* const /*parent*/)
{
// Nothing to do
}
QString DImgPNGPlugin::loaderName() const
{
return QLatin1String("PNG");
}
QString DImgPNGPlugin::typeMimes() const
{
return QLatin1String("PNG");
}
QMap<QString, QStringList> DImgPNGPlugin::extraAboutData() const
{
QMap<QString, QStringList> map;
map.insert(QLatin1String("PNG"), QStringList() << i18nc("@title", "Portable Network Graphic")
<< i18nc("@info: can read file format", "yes")
<< i18nc("@info: can write file format", "yes")
);
return map;
}
int DImgPNGPlugin::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 pngID[8] = { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A };
if (memcmp(header.data(), &pngID, 8) == 0)
{
return 10;
}
return 0;
}
int DImgPNGPlugin::canWrite(const QString& format) const
{
return (typeMimes().contains(format.toUpper()) ? 10 : 0);
}
DImgLoader* DImgPNGPlugin::loader(DImg* const image, const DRawDecoding&) const
{
return new DImgPNGLoader(image);
}
DImgLoaderSettings* DImgPNGPlugin::exportWidget(const QString& format) const
{
if (canWrite(format))
{
return (new DImgPNGExportSettings());
}
return nullptr;
}
} // namespace DigikamPNGDImgPlugin
#include "moc_dimgpngplugin.cpp"
|