File indexing completed on 2024-04-21 03:51:05

 /*
     SPDX-FileCopyrightText: 2010 Daniel Laidig <laidig@kde.org>
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "imagecache.h"
 
 #include <QDataStream>
 #include <QDir>
 #include <QFileInfo>
 
 #include <QDebug>
 
 using namespace Practice;
 
 const char *identifier = "parleyimagecache2";
 
 void ImageCache::setFilenames(const QStringList &filenames)
 {
     m_timestamps.clear();
     for (const QString &filename : filenames) {
         QFileInfo info(filename);
         m_timestamps.append(info.lastModified());
     }
     m_images.clear();
     m_filenames = filenames;
     if (!m_saveFilename.isNull()) {
         openCache();
     }
 }
 
 void ImageCache::updateImage(const QString &id, const QImage &image)
 {
     m_images[id] = image;
 }
 
 QSize ImageCache::imageSize(const QString &id)
 {
     if (!m_images.contains(id)) {
         return QSize();
     }
     return m_images.value(id).size();
 }
 
 QImage ImageCache::getImage(const QString &id)
 {
     if (!m_images.contains(id)) {
         return QImage();
     }
     return m_images.value(id);
 }
 
 void ImageCache::setSaveFilename(const QString &filename)
 {
     m_saveFilename = filename;
     QDir fileDir = QFileInfo(filename).absoluteDir();
     if (!fileDir.exists() && !fileDir.mkpath(QStringLiteral("."))) {
         qWarning() << QStringLiteral("Couldn't create image cache path: ") << fileDir.absolutePath();
     }
 }
 
 void ImageCache::openCache()
 {
     QFile file(m_saveFilename);
     if (!file.open(QIODevice::ReadOnly)) {
         // If cache is used for the first time it's normal to fail here,
         // because cache file doesn't exist at this time.
         return;
     }
     QDataStream stream(&file);
     // check identifier
     QString temp;
     stream >> temp;
     if (temp != QString(identifier)) {
         // qDebug() << "not loading cache because the identifier doesn't match";
         return;
     }
     // check filename and timestamp, no need to load images for the wrong file or outdated images
     QStringList filenames;
     QList<QDateTime> timestamps;
     stream >> filenames >> timestamps;
     if (filenames != m_filenames || timestamps != m_timestamps) {
         // qDebug() << "not loading cache because it contains the wrong theme or the timestamp has changed";
         return;
     }
     // finally load data
     stream >> m_images;
     QHashIterator<QString, QImage> i(m_images); // TODO: do on demand
     while (i.hasNext()) {
         i.next();
         m_images[i.key()] = i.value().convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
     // qDebug() << "opened cache:" << m_saveFilename;
     // qDebug() << *this;
 }
 
 void ImageCache::saveCache()
 {
     // qDebug() << "save cache to:" << m_saveFilename;
     // qDebug() << *this;
     QFile file(m_saveFilename);
     file.open(QIODevice::WriteOnly);
     QDataStream stream(&file);
     stream << QString(identifier) << m_filenames << m_timestamps << m_images;
 }
 
 QDebug Practice::operator<<(QDebug dbg, const ImageCache &c)
 {
     dbg.nospace() << "(ImageCache, " << c.m_filenames << ", " << c.m_timestamps << ")";
     int pixels = 0;
     QHashIterator<QString, QImage> i(c.m_images);
     while (i.hasNext()) {
         i.next();
         dbg.nospace() << "\n\tcontains: " << qPrintable(i.key().leftJustified(35)) << ": " << i.value().size();
         pixels += i.value().size().width() * i.value().height();
     }
 
     dbg.nospace() << "\n\ttotal pixel count: " << pixels << " (approx. " << double(pixels) * 4 / 1024 / 1024 << " MiB)";
     return dbg.space();
 }