File indexing completed on 2025-01-05 04:02:14

 // vim: set tabstop=4 shiftwidth=4 expandtab:
 /*
 Gwenview: an image viewer
 Copyright 2012 Aurélien Gâteau <agateau@kde.org>
 
 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) any later version.
 
 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, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
 
 */
 // Self
 #include "thumbnailwriter.h"
 
 // Local
 #include "gwenview_lib_debug.h"
 #include "gwenviewconfig.h"
 
 // Qt
 #include <QImage>
 #include <QTemporaryFile>
 
 namespace Gwenview
 {
 #undef ENABLE_LOG
 #undef LOG
 // #define ENABLE_LOG
 #ifdef ENABLE_LOG
 #define LOG(x) // qCDebug(GWENVIEW_LIB_LOG) << x
 #else
 #define LOG(x) ;
 #endif
 
 static void storeThumbnailToDiskCache(const QString &path, const QImage &image)
 {
     if (GwenviewConfig::lowResourceUsageMode()) {
         return;
     }
 
     LOG(path);
     QTemporaryFile tmp(path + QStringLiteral(".gwenview.tmpXXXXXX.png"));
     if (!tmp.open()) {
         qCWarning(GWENVIEW_LIB_LOG) << "Could not create a temporary file.";
         return;
     }
 
     if (!image.save(tmp.fileName(), "png")) {
         qCWarning(GWENVIEW_LIB_LOG) << "Could not save thumbnail";
         return;
     }
 
     QFile::rename(tmp.fileName(), path);
 }
 
 void ThumbnailWriter::queueThumbnail(const QString &path, const QImage &image)
 {
     if (GwenviewConfig::lowResourceUsageMode()) {
         return;
     }
 
     LOG(path);
     QMutexLocker locker(&mMutex);
     mCache.insert(path, image);
     start();
 }
 
 void ThumbnailWriter::run()
 {
     QMutexLocker locker(&mMutex);
     while (!mCache.isEmpty() && !isInterruptionRequested()) {
         Cache::ConstIterator it = mCache.constBegin();
         const QString path = it.key();
         const QImage image = it.value();
 
         // This part of the thread is the most time consuming but it does not
         // depend on mCache so we can unlock here. This way other thumbnails
         // can be added or queried
         locker.unlock();
         storeThumbnailToDiskCache(path, image);
         locker.relock();
 
         mCache.remove(path);
     }
 }
 
 QImage ThumbnailWriter::value(const QString &path) const
 {
     QMutexLocker locker(&mMutex);
     return mCache.value(path);
 }
 
 bool ThumbnailWriter::isEmpty() const
 {
     QMutexLocker locker(&mMutex);
     return mCache.isEmpty();
 }
 
 } // namespace
 
 #include "moc_thumbnailwriter.cpp"