File indexing completed on 2024-04-28 04:58:03

 /*  This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2008 Andre Gemünd <scroogie@gmail.com>
     SPDX-FileCopyrightText: 2016 Alexander Volkov <a.volkov@rusbitech.ru>
     SPDX-FileCopyrightText: 2022 Kai Uwe Broulik <kde@broulik.de>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "config-thumbnail.h"
 
 #include "jpegcreator.h"
 #include "jpegcreatorsettings5.h"
 
 #include <QImage>
 #include <QImageReader>
 
 #include <KLocalizedString>
 #include <KPluginFactory>
 
 #if HAVE_KEXIV2
 #include <KExiv2/KExiv2>
 #endif
 
 K_PLUGIN_CLASS_WITH_JSON(JpegCreator, "jpegthumbnail.json")
 
 JpegCreator::JpegCreator(QObject *parent, const QVariantList &args)
     : KIO::ThumbnailCreator(parent, args)
 {
 }
 
 KIO::ThumbnailResult JpegCreator::exifThumbnail(const KIO::ThumbnailRequest &request) const
 {
 #if HAVE_KEXIV2
     KExiv2Iface::KExiv2 exiv2Image(request.url().toLocalFile());
     QImage image = exiv2Image.getExifThumbnail(JpegCreatorSettings::self()->rotate());
 
     if (image.isNull()) {
         return KIO::ThumbnailResult::fail();
     }
 
     // skip embedded thumbnail if strictly smaller
     if (image.size().width() < request.targetSize().width() && image.size().height() < request.targetSize().height()) {
         return KIO::ThumbnailResult::fail();
     }
 
     return KIO::ThumbnailResult::pass(image);
 #else
     Q_UNUSED(request)
     return KIO::ThumbnailResult::fail();
 #endif // HAVE_KEXIV2
 }
 
 KIO::ThumbnailResult JpegCreator::imageReaderThumbnail(const KIO::ThumbnailRequest &request) const
 {
     QImageReader imageReader(request.url().toLocalFile(), "jpeg");
     const QSize imageSize = imageReader.size();
     if (imageSize.isValid() && (imageSize.width() > request.targetSize().width() || imageSize.height() > request.targetSize().height())) {
         const QSize thumbnailSize = imageSize.scaled(request.targetSize(), Qt::KeepAspectRatio);
         imageReader.setScaledSize(thumbnailSize); // fast downscaling
     }
     imageReader.setQuality(75); // set quality so that the jpeg handler will use a high quality downscaler
 
     imageReader.setAutoTransform(JpegCreatorSettings::self()->rotate());
 
     QImage image = imageReader.read();
 
     if (image.isNull()) {
         return KIO::ThumbnailResult::fail();
     }
 
     return KIO::ThumbnailResult::pass(image);
 }
 
 KIO::ThumbnailResult JpegCreator::create(const KIO::ThumbnailRequest &request)
 {
     JpegCreatorSettings::self()->load();
 
     if (auto result = exifThumbnail(request); result.isValid()) {
         return result;
     }
 
     if (auto result = imageReaderThumbnail(request); result.isValid()) {
         return result;
     }
 
     return KIO::ThumbnailResult::fail();
 }
 
 #include "jpegcreator.moc"
 #include "moc_jpegcreator.cpp"