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#include <QFutureWatcher>
#include <QPixmapCache>
#include <QStringBuilder>
#include <QtConcurrentRun>
#include <QtDebug>
#include "library/coverartcache.h"
#include "library/coverartutils.h"
#include "util/logger.h"
namespace {
mixxx::Logger kLogger("CoverArtCache");
QString pixmapCacheKey(quint16 hash, int width) {
return QString("CoverArtCache_%1_%2")
.arg(QString::number(hash)).arg(width);
}
// The transformation mode when scaling images
const Qt::TransformationMode kTransformationMode = Qt::SmoothTransformation;
// Resizes the image (preserving aspect ratio) to width.
inline QImage resizeImageWidth(const QImage& image, int width) {
return image.scaledToWidth(width, kTransformationMode);
}
} // anonymous namespace
const bool sDebug = false;
CoverArtCache::CoverArtCache() {
// The initial QPixmapCache limit is 10MB.
// But it is not used just by the coverArt stuff,
// it is also used by Qt to handle other things behind the scenes.
// Consequently coverArt cache will always have less than those
// 10MB available to store the pixmaps.
// So, we must increase this size a bit more,
// in order to allow CoverCache handle more covers (performance gain).
QPixmapCache::setCacheLimit(20480);
}
CoverArtCache::~CoverArtCache() {
qDebug() << "~CoverArtCache()";
}
QPixmap CoverArtCache::requestCover(const CoverInfo& requestInfo,
const QObject* pRequestor,
const int desiredWidth,
const bool onlyCached,
const bool signalWhenDone) {
if (sDebug) {
kLogger.debug() << "requestCover"
<< requestInfo << pRequestor <<
desiredWidth << onlyCached << signalWhenDone;
}
if (requestInfo.type == CoverInfo::NONE) {
if (signalWhenDone) {
emit(coverFound(pRequestor, 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*, quint16> requestId = qMakePair(pRequestor, requestInfo.hash);
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 = pixmapCacheKey(requestInfo.hash, desiredWidth);
QPixmap pixmap;
if (QPixmapCache::find(cacheKey, &pixmap)) {
if (signalWhenDone) {
emit(coverFound(pRequestor, requestInfo, pixmap, true));
}
return pixmap;
}
if (onlyCached) {
if (sDebug) {
kLogger.debug() << "requestCover cache miss";
}
return QPixmap();
}
m_runningRequests.insert(requestId);
// The watcher will be deleted in coverLoaded()
QFutureWatcher<FutureResult>* watcher = new QFutureWatcher<FutureResult>(this);
QFuture<FutureResult> future = QtConcurrent::run(
this, &CoverArtCache::loadCover, requestInfo, pRequestor,
desiredWidth, signalWhenDone);
connect(watcher,
&QFutureWatcher<FutureResult>::finished,
this,
&CoverArtCache::coverLoaded);
watcher->setFuture(future);
return QPixmap();
}
//static
void CoverArtCache::requestCover(const Track& track,
const QObject* pRequestor) {
CoverArtCache* pCache = CoverArtCache::instance();
if (pCache == nullptr) return;
CoverInfo info = track.getCoverInfoWithLocation();
pCache->requestCover(info, pRequestor, 0, false, true);
}
CoverArtCache::FutureResult CoverArtCache::loadCover(
const CoverInfo& info,
const QObject* pRequestor,
const int desiredWidth,
const bool signalWhenDone) {
if (sDebug) {
kLogger.debug() << "loadCover"
<< info << desiredWidth << signalWhenDone;
}
QImage image = CoverArtUtils::loadCover(info);
// TODO(XXX) Should we re-hash here? If the cover file (or track metadata)
// has changed then info.hash may be incorrect. The fix
// will also require noticing a hash mis-match at higher levels and
// recording the hash change in the database.
// Adjust the cover size according to the request or downsize the image for
// efficiency.
if (!image.isNull() && desiredWidth > 0) {
image = resizeImageWidth(image, desiredWidth);
}
FutureResult res;
res.pRequestor = pRequestor;
res.cover = CoverArt(info, image, desiredWidth);
res.signalWhenDone = signalWhenDone;
return res;
}
// watcher
void CoverArtCache::coverLoaded() {
FutureResult res;
{
QFutureWatcher<FutureResult>* watcher =
static_cast<QFutureWatcher<FutureResult>*>(sender());
res = watcher->result();
watcher->deleteLater();
}
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));
}
}
void CoverArtCache::requestGuessCovers(QList<TrackPointer> tracks) {
QtConcurrent::run(this, &CoverArtCache::guessCovers, tracks);
}
void CoverArtCache::requestGuessCover(TrackPointer pTrack) {
QtConcurrent::run(this, &CoverArtCache::guessCover, pTrack);
}
void CoverArtCache::guessCover(TrackPointer pTrack) {
if (pTrack) {
if (kLogger.debugEnabled()) {
kLogger.debug()
<< "Guessing cover art for"
<< pTrack->getFileInfo();
}
CoverInfo cover = CoverArtUtils::guessCoverInfo(*pTrack);
pTrack->setCoverInfo(cover);
}
}
void CoverArtCache::guessCovers(QList<TrackPointer> tracks) {
if (kLogger.debugEnabled()) {
kLogger.debug()
<< "Guessing cover art for"
<< tracks.size()
<< "tracks";
}
foreach (TrackPointer pTrack, tracks) {
guessCover(pTrack);
}
}
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