File indexing completed on 2024-05-05 17:04:28

 /*
  * Assists in creating thumbnails for Gemini's file views
  * Copyright 2014  Dan Leinir Turthra Jensen <admin@leinir.dk>
  *
  * 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 of
  * the License or (at your option) version 3 or any later version
  * accepted by the membership of KDE e.V. (or its successor approved
  * by the membership of KDE e.V.), which shall act as a proxy
  * defined in Section 14 of version 3 of the license.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
 
 #include "ThumbnailHelperImpl.h"
 #include <QMimeDatabase>
 
 #include <KoDocument.h>
 #include <KoDocumentEntry.h>
 #include <KoPart.h>
 #include <KoStore.h>
 
 #include <QTimer>
 #include <QImage>
 #include <QApplication>
 #include <QPainter>
 #include <QMimeType>
 
 static const int minThumbnailSize = 400;
 static const int timeoutTime = 5000; // in msec
 
 ThumbnailHelperImpl::ThumbnailHelperImpl(QObject* parent)
     : QObject(parent)
     , m_part(0)
     , m_doc(0)
 {
 }
 
 ThumbnailHelperImpl::~ThumbnailHelperImpl()
 {
     if(m_doc)
         m_doc->deleteLater();
 }
 
 bool ThumbnailHelperImpl::convert(const QString& in, const QString& out, int width, int height)
 {
     // Other locations for thumbnails use the embedded thumbnails. This
     // application specifically exists to ensure less crashes in situations
     // where that embedded image doesn't exist or is invalid for whatever
     // reason. As a direct consequence, we do not attempt to load that image.
     QImage image(width, height, QImage::Format_ARGB32_Premultiplied);
 
     QMimeDatabase db;
     const QString mimetype = db.mimeTypeForFile(in).name();
     QString error;
     KoDocumentEntry documentEntry = KoDocumentEntry::queryByMimeType(mimetype);
     m_part = documentEntry.createKoPart(&error);
 
     if (!m_part)
         return false;
 
     m_doc = m_part->document();
 
     // prepare the document object
     m_doc->setCheckAutoSaveFile(false);
     m_doc->setAutoErrorHandlingEnabled(false); // don't show message boxes
     connect(m_doc, SIGNAL(completed()), SLOT(onLoadingCompleted()));
 
     // load the document content
     QUrl url = QUrl::fromLocalFile(in);
     if (!m_doc->openUrl(url)) {
         delete m_doc;
         qDebug() << "Load failure! Document did not open" << url;
         return false;
     }
 
     while(m_doc->isLoading()) {
         qApp->processEvents();
     }
 
     // render the page on a bigger pixmap and use smoothScale,
     // looks better than directly scaling with the QPainter (malte)
     //const bool usePassedSize = (width > minThumbnailSize && height > minThumbnailSize);
     //const QSize size = usePassedSize ? QSize(width, height) : QSize(minThumbnailSize, minThumbnailSize);
     const QSize size = QSize(width, height);
     image = m_doc->generatePreview(size * 2).toImage().scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
 
     m_doc->closeUrl();
 
     image.save(out);
 
     return m_loadingCompleted;
 }