Spectral/src/imageprovider.cpp

80 lines
2.3 KiB
C++

#include "imageprovider.h"
#include <QFile>
#include <QMetaObject>
#include <QStandardPaths>
#include <QtCore/QDebug>
#include <QtCore/QWaitCondition>
#include "jobs/mediathumbnailjob.h"
#include "connection.h"
using QMatrixClient::MediaThumbnailJob;
ImageProvider::ImageProvider(QObject* parent)
: QObject(parent),
QQuickImageProvider(
QQmlImageProviderBase::Image,
QQmlImageProviderBase::ForceAsynchronousImageLoading) {
#if (QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
qRegisterMetaType<MediaThumbnailJob*>();
#endif
}
QImage ImageProvider::requestImage(const QString& id, QSize* pSize,
const QSize& requestedSize) {
if (!id.startsWith("mxc://")) {
qWarning() << "ImageProvider: won't fetch an invalid id:" << id
<< "doesn't follow server/mediaId pattern";
return {};
}
QUrl mxcUri{id};
QUrl tempfilePath = QUrl::fromLocalFile(
QStandardPaths::writableLocation(QStandardPaths::CacheLocation) + "/" +
mxcUri.fileName() + "-" + QString::number(requestedSize.width()) + "x" +
QString::number(requestedSize.height()) + ".png");
QImage cachedImage;
if (cachedImage.load(tempfilePath.toLocalFile())) {
if (pSize != nullptr) *pSize = cachedImage.size();
return cachedImage;
}
MediaThumbnailJob* job = nullptr;
QReadLocker locker(&m_lock);
#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
QMetaObject::invokeMethod(
m_connection,
[=] { return m_connection->getThumbnail(mxcUri, requestedSize); },
Qt::BlockingQueuedConnection, &job);
#else
QMetaObject::invokeMethod(m_connection, "getThumbnail",
Qt::BlockingQueuedConnection,
Q_RETURN_ARG(MediaThumbnailJob*, job),
Q_ARG(QUrl, mxcUri), Q_ARG(QSize, requestedSize));
#endif
if (!job) {
qDebug() << "ImageProvider: failed to send a request";
return {};
}
QImage result;
{
QWaitCondition condition; // The most compact way to block on a signal
job->connect(job, &MediaThumbnailJob::finished, job, [&] {
result = job->thumbnail();
condition.wakeAll();
});
condition.wait(&m_lock);
}
if (pSize != nullptr) *pSize = result.size();
result.save(tempfilePath.toLocalFile());
return result;
}