110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
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// vim: set tabstop=4 shiftwidth=4 expandtab:
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/*
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Gwenview: an image viewer
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Copyright 2012 Aurélien Gâteau <agateau@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
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*/
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// Self
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#include "thumbnailwriter.h"
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// Local
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#include "gwenview_lib_debug.h"
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#include "gwenviewconfig.h"
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// Qt
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#include <QImage>
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#include <QTemporaryFile>
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namespace Gwenview
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{
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#undef ENABLE_LOG
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#undef LOG
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// #define ENABLE_LOG
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#ifdef ENABLE_LOG
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#define LOG(x) // qCDebug(GWENVIEW_LIB_LOG) << x
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#else
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#define LOG(x) ;
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#endif
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static void storeThumbnailToDiskCache(const QString &path, const QImage &image)
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{
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if (GwenviewConfig::lowResourceUsageMode()) {
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return;
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}
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LOG(path);
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QTemporaryFile tmp(path + QStringLiteral(".gwenview.tmpXXXXXX.png"));
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if (!tmp.open()) {
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qCWarning(GWENVIEW_LIB_LOG) << "Could not create a temporary file.";
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return;
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}
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if (!image.save(tmp.fileName(), "png")) {
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qCWarning(GWENVIEW_LIB_LOG) << "Could not save thumbnail";
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return;
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}
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QFile::rename(tmp.fileName(), path);
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}
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void ThumbnailWriter::queueThumbnail(const QString &path, const QImage &image)
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{
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if (GwenviewConfig::lowResourceUsageMode()) {
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return;
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}
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LOG(path);
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QMutexLocker locker(&mMutex);
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mCache.insert(path, image);
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start();
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}
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void ThumbnailWriter::run()
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{
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QMutexLocker locker(&mMutex);
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while (!mCache.isEmpty() && !isInterruptionRequested()) {
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Cache::ConstIterator it = mCache.constBegin();
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const QString path = it.key();
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const QImage image = it.value();
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// This part of the thread is the most time consuming but it does not
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// depend on mCache so we can unlock here. This way other thumbnails
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// can be added or queried
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locker.unlock();
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storeThumbnailToDiskCache(path, image);
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locker.relock();
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mCache.remove(path);
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}
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}
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QImage ThumbnailWriter::value(const QString &path) const
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{
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QMutexLocker locker(&mMutex);
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return mCache.value(path);
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}
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bool ThumbnailWriter::isEmpty() const
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{
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QMutexLocker locker(&mMutex);
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return mCache.isEmpty();
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}
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} // namespace
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#include "moc_thumbnailwriter.cpp"
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