// watcher
void CoverArtCache::coverLoaded() {
QFutureWatcher<FutureResult>* watcher;
watcher = reinterpret_cast<QFutureWatcher<FutureResult>*>(sender());
FutureResult res = watcher->result();
if (sDebug) {
kLogger.debug() << "coverLoaded" << res.cover;
}
// Don't cache full size covers (resizedToWidth = 0)
// Large cover art wastes space in our cache and will likely
// uncache a lot of the small covers we need in the library
// table.
// Full size covers are used in the Skin Widgets, which are
// loaded with an artificial delay anyway and an additional
// re-load delay can be accepted.
// Create pixmap, GUI thread only
QPixmap pixmap = QPixmap::fromImage(res.cover.image);
if (!pixmap.isNull() && res.cover.resizedToWidth != 0) {
// we have to be sure that res.cover.hash is unique
// because insert replaces the images with the same key
QString cacheKey = pixmapCacheKey(
res.cover.hash, res.cover.resizedToWidth);
QPixmapCache::insert(cacheKey, pixmap);
}
m_runningRequests.remove(qMakePair(res.pRequestor, res.cover.hash));
if (res.signalWhenDone) {
emit(coverFound(res.pRequestor, res.cover, pixmap, false));
}
}
QPixmap CoverArtCache::requestCover(const CoverInfo& requestInfo,
const QObject* pRequestor,
int requestReference,
const int desiredWidth,
const bool onlyCached,
const bool signalWhenDone) {
if (sDebug) {
qDebug() << "CoverArtCache::requestCover"
<< requestInfo << pRequestor << requestReference <<
desiredWidth << onlyCached << signalWhenDone;
}
if (requestInfo.type == CoverInfo::NONE) {
if (signalWhenDone) {
emit(coverFound(pRequestor, requestReference, requestInfo,
QPixmap(), true));
}
return QPixmap();
}
// keep a list of trackIds for which a future is currently running
// to avoid loading the same picture again while we are loading it
QPair<const QObject*, int> requestId = qMakePair(pRequestor, requestReference);
if (m_runningRequests.contains(requestId)) {
return QPixmap();
}
// If this request comes from CoverDelegate (table view), it'll want to get
// a cropped cover which is ready to be drawn in the table view (cover art
// column). It's very important to keep the cropped covers in cache because
// it avoids having to rescale+crop it ALWAYS (which brings a lot of
// performance issues).
QString cacheKey = CoverArtUtils::pixmapCacheKey(requestInfo.hash,
desiredWidth);
QPixmap pixmap;
if (QPixmapCache::find(cacheKey, &pixmap)) {
if (signalWhenDone) {
emit(coverFound(pRequestor, requestReference, requestInfo, pixmap, true));
}
return pixmap;
}
if (onlyCached) {
if (sDebug) {
qDebug() << "CoverArtCache::requestCover cache miss";
}
return QPixmap();
}
m_runningRequests.insert(requestId);
QFutureWatcher<FutureResult>* watcher = new QFutureWatcher<FutureResult>(this);
QFuture<FutureResult> future = QtConcurrent::run(
this, &CoverArtCache::loadCover, requestInfo, pRequestor,
requestReference, desiredWidth, signalWhenDone);
connect(watcher, SIGNAL(finished()), this, SLOT(coverLoaded()));
watcher->setFuture(future);
return QPixmap();
}
// watcher
void CoverArtCache::coverLoaded() {
QFutureWatcher<FutureResult>* watcher;
watcher = reinterpret_cast<QFutureWatcher<FutureResult>*>(sender());
FutureResult res = watcher->result();
if (sDebug) {
qDebug() << "CoverArtCache::coverLoaded" << res.cover;
}
QString cacheKey = CoverArtUtils::pixmapCacheKey(res.cover.info.hash,
res.desiredWidth);
QPixmap pixmap;
if (!QPixmapCache::find(cacheKey, &pixmap) && !res.cover.image.isNull()) {
pixmap.convertFromImage(res.cover.image);
QPixmapCache::insert(cacheKey, pixmap);
}
m_runningRequests.remove(qMakePair(res.pRequestor, res.requestReference));
if (res.signalWhenDone) {
emit(coverFound(res.pRequestor, res.requestReference,
res.cover.info, pixmap, false));
}
}
