146 lines
4.0 KiB
C++
146 lines
4.0 KiB
C++
// vim: set tabstop=4 shiftwidth=4 expandtab:
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/*
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Gwenview: an image viewer
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Copyright 2008 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 "timeutils.h"
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// STL
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#include <memory>
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// Qt
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#include <QDateTime>
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// KF
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#include <KFileItem>
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// Exiv2
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#include <exiv2/exiv2.hpp>
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// Local
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#include "gwenview_lib_debug.h"
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#include <lib/exiv2imageloader.h>
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#include <lib/urlutils.h>
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namespace Gwenview
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{
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namespace TimeUtils
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{
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static Exiv2::ExifData::const_iterator findDateTimeKey(const Exiv2::ExifData &exifData)
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{
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// Ordered list of keys to try
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static QList<Exiv2::ExifKey> lst = QList<Exiv2::ExifKey>() << Exiv2::ExifKey("Exif.Photo.DateTimeOriginal") << Exiv2::ExifKey("Exif.Image.DateTimeOriginal")
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<< Exiv2::ExifKey("Exif.Photo.DateTimeDigitized") << Exiv2::ExifKey("Exif.Image.DateTime");
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Exiv2::ExifData::const_iterator it, end = exifData.end();
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for (const Exiv2::ExifKey &key : qAsConst(lst)) {
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it = exifData.findKey(key);
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if (it != end) {
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return it;
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}
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}
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return end;
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}
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struct CacheItem {
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QDateTime fileMTime;
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QDateTime realTime;
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void update(const KFileItem &fileItem)
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{
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QDateTime time = fileItem.time(KFileItem::ModificationTime);
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if (fileMTime == time) {
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return;
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}
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fileMTime = time;
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if (!updateFromExif(fileItem.url())) {
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realTime = time;
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}
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}
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bool updateFromExif(const QUrl &url)
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{
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if (!UrlUtils::urlIsFastLocalFile(url)) {
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return false;
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}
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const QString path = url.path();
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Exiv2ImageLoader loader;
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if (!loader.load(path)) {
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return false;
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}
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std::unique_ptr<Exiv2::Image> img(loader.popImage().release());
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try {
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Exiv2::ExifData exifData = img->exifData();
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if (exifData.empty()) {
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return false;
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}
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auto it = findDateTimeKey(exifData);
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if (it == exifData.end()) {
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qCWarning(GWENVIEW_LIB_LOG) << "No date in exif header of" << path;
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return false;
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}
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std::ostringstream stream;
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stream << *it;
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const QString value = QString::fromLocal8Bit(stream.str().c_str());
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const QDateTime dt = QDateTime::fromString(value, QStringLiteral("yyyy:MM:dd hh:mm:ss"));
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if (!dt.isValid()) {
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qCWarning(GWENVIEW_LIB_LOG) << "Invalid date in exif header of" << path;
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return false;
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}
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realTime = dt;
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return true;
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} catch (const Exiv2::Error &error) {
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qCWarning(GWENVIEW_LIB_LOG) << "Failed to read date from exif header of" << path << ". Error:" << error.what();
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return false;
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}
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}
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};
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using Cache = QHash<QUrl, CacheItem>;
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QDateTime dateTimeForFileItem(const KFileItem &fileItem, CachePolicy cachePolicy)
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{
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if (cachePolicy == SkipCache) {
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CacheItem item;
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item.update(fileItem);
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return item.realTime;
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}
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static Cache cache;
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const QUrl url = fileItem.targetUrl();
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Cache::iterator it = cache.find(url);
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if (it == cache.end()) {
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it = cache.insert(url, CacheItem());
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}
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it.value().update(fileItem);
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return it.value().realTime;
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}
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} // namespace
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} // namespace
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