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126 lines
3.2 KiB
C++
126 lines
3.2 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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// Qt
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#include <QFile>
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// KDE
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#include <KDebug>
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#include <KFileItem>
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#include <KExiv2>
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// Local
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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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struct CacheItem
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{
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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 KUrl& 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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const KExiv2 kexiv2(path);
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// Ordered list of keys to try
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static QList<QByteArray> datelst = QList<QByteArray>()
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<< QByteArray("Exif.Photo.DateTimeOriginal")
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<< QByteArray("Exif.Image.DateTimeOriginal")
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<< QByteArray("Exif.Photo.DateTimeDigitized")
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<< QByteArray("Exif.Image.DateTime");
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QString exifvalue;
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foreach (const QByteArray &date, datelst) {
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foreach (const KExiv2Property &kexiv2property, kexiv2.metadata()) {
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if (kexiv2property.name == date) {
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exifvalue = kexiv2property.value;
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break;
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}
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}
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if (!exifvalue.isEmpty()) {
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break;
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}
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}
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if (exifvalue.isEmpty()) {
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kDebug() << "No exif date in" << path;
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return false;
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}
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QDateTime dt = QDateTime::fromString(exifvalue, "yyyy:MM:dd hh:mm:ss");
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if (!dt.isValid()) {
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kWarning() << "Invalid date in exif header of" << path << exifvalue;
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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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}
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};
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typedef QHash<KUrl, CacheItem> Cache;
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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 KUrl 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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