/*  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 <KPluginFactory>

#if HAVE_KEXIV2

#include <KExiv2/KExiv2>

#endif

K_PLUGIN_CLASS_WITH_JSON(JpegCreator, "jpegthumbnail.json")

Unexecuted instantiation: jpegthumbnail_factory::tr(char const*, char const*, int)

Unexecuted instantiation: jpegthumbnail_factory::~jpegthumbnail_factory()

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"