Clementine-audio-player-Mac.../src/covers/albumcoverloader.cpp

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/* This file is part of Clementine.
Copyright 2010, David Sansome <me@davidsansome.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include "albumcoverloader.h"
#include <QPainter>
#include <QDir>
#include <QCoreApplication>
#include <QUrl>
#include <QNetworkReply>
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#include "config.h"
#include "core/closure.h"
#include "core/logging.h"
#include "core/network.h"
#include "core/tagreaderclient.h"
#include "core/utilities.h"
#include "internet/internetmodel.h"
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#include "internet/spotifyservice.h"
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AlbumCoverLoader::AlbumCoverLoader(QObject* parent)
: QObject(parent),
stop_requested_(false),
next_id_(1),
network_(new NetworkAccessManager(this)),
connected_spotify_(false) {}
QString AlbumCoverLoader::ImageCacheDir() {
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return Utilities::GetConfigPath(Utilities::Path_AlbumCovers);
}
void AlbumCoverLoader::CancelTask(quint64 id) {
QMutexLocker l(&mutex_);
for (QQueue<Task>::iterator it = tasks_.begin(); it != tasks_.end(); ++it) {
if (it->id == id) {
tasks_.erase(it);
break;
}
}
}
void AlbumCoverLoader::CancelTasks(const QSet<quint64>& ids) {
QMutexLocker l(&mutex_);
for (QQueue<Task>::iterator it = tasks_.begin(); it != tasks_.end();) {
if (ids.contains(it->id)) {
it = tasks_.erase(it);
} else {
++it;
}
}
}
quint64 AlbumCoverLoader::LoadImageAsync(const AlbumCoverLoaderOptions& options,
const QString& art_automatic,
const QString& art_manual,
const QString& song_filename,
const QImage& embedded_image) {
Task task;
task.options = options;
task.art_automatic = art_automatic;
task.art_manual = art_manual;
task.song_filename = song_filename;
task.embedded_image = embedded_image;
task.state = State_TryingManual;
{
QMutexLocker l(&mutex_);
task.id = next_id_++;
tasks_.enqueue(task);
}
metaObject()->invokeMethod(this, "ProcessTasks", Qt::QueuedConnection);
return task.id;
}
void AlbumCoverLoader::ProcessTasks() {
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while (!stop_requested_) {
// Get the next task
Task task;
{
QMutexLocker l(&mutex_);
if (tasks_.isEmpty()) return;
task = tasks_.dequeue();
}
ProcessTask(&task);
}
}
void AlbumCoverLoader::ProcessTask(Task* task) {
TryLoadResult result = TryLoadImage(*task);
if (result.started_async) {
// The image is being loaded from a remote URL, we'll carry on later
// when it's done
return;
}
if (result.loaded_success) {
QImage scaled = ScaleAndPad(task->options, result.image);
emit ImageLoaded(task->id, scaled);
emit ImageLoaded(task->id, scaled, result.image);
return;
}
NextState(task);
}
void AlbumCoverLoader::NextState(Task* task) {
if (task->state == State_TryingManual) {
// Try the automatic one next
task->state = State_TryingAuto;
ProcessTask(task);
} else {
// Give up
emit ImageLoaded(task->id, task->options.default_output_image_);
emit ImageLoaded(task->id, task->options.default_output_image_,
task->options.default_output_image_);
}
}
AlbumCoverLoader::TryLoadResult AlbumCoverLoader::TryLoadImage(
const Task& task) {
// An image embedded in the song itself takes priority
if (!task.embedded_image.isNull())
return TryLoadResult(false, true,
ScaleAndPad(task.options, task.embedded_image));
QString filename;
switch (task.state) {
case State_TryingAuto:
filename = task.art_automatic;
break;
case State_TryingManual:
filename = task.art_manual;
break;
}
if (filename == Song::kManuallyUnsetCover)
return TryLoadResult(false, true, task.options.default_output_image_);
if (filename == Song::kEmbeddedCover && !task.song_filename.isEmpty()) {
const QImage taglib_image =
TagReaderClient::Instance()->LoadEmbeddedArtBlocking(
task.song_filename);
if (!taglib_image.isNull())
return TryLoadResult(false, true,
ScaleAndPad(task.options, taglib_image));
}
if (filename.toLower().startsWith("http://")) {
QUrl url(filename);
QNetworkReply* reply = network_->get(QNetworkRequest(url));
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NewClosure(reply, SIGNAL(finished()), this,
SLOT(RemoteFetchFinished(QNetworkReply*)), reply);
remote_tasks_.insert(reply, task);
return TryLoadResult(true, false, QImage());
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} else if (filename.toLower().startsWith("spotify://image/")) {
// HACK: we should add generic image URL handlers
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SpotifyService* spotify = InternetModel::Service<SpotifyService>();
if (!connected_spotify_) {
connect(spotify, SIGNAL(ImageLoaded(QString, QImage)),
SLOT(SpotifyImageLoaded(QString, QImage)));
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connected_spotify_ = true;
}
QString id = QUrl(filename).path();
if (id.startsWith('/')) {
id.remove(0, 1);
}
remote_spotify_tasks_.insert(id, task);
// Need to schedule this in the spotify service's thread
QMetaObject::invokeMethod(spotify, "LoadImage", Qt::QueuedConnection,
Q_ARG(QString, id));
return TryLoadResult(true, false, QImage());
}
QImage image(filename);
return TryLoadResult(
false, !image.isNull(),
image.isNull() ? task.options.default_output_image_ : image);
}
void AlbumCoverLoader::SpotifyImageLoaded(const QString& id,
const QImage& image) {
if (!remote_spotify_tasks_.contains(id)) return;
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Task task = remote_spotify_tasks_.take(id);
QImage scaled = ScaleAndPad(task.options, image);
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emit ImageLoaded(task.id, scaled);
emit ImageLoaded(task.id, scaled, image);
}
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void AlbumCoverLoader::RemoteFetchFinished(QNetworkReply* reply) {
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reply->deleteLater();
Task task = remote_tasks_.take(reply);
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// Handle redirects.
QVariant redirect =
reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
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if (redirect.isValid()) {
if (++task.redirects > kMaxRedirects) {
return; // Give up.
}
QNetworkRequest request = reply->request();
request.setUrl(redirect.toUrl());
QNetworkReply* redirected_reply = network_->get(request);
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NewClosure(redirected_reply, SIGNAL(finished()), this,
SLOT(RemoteFetchFinished(QNetworkReply*)), redirected_reply);
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remote_tasks_.insert(redirected_reply, task);
return;
}
if (reply->error() == QNetworkReply::NoError) {
// Try to load the image
QImage image;
if (image.load(reply, 0)) {
QImage scaled = ScaleAndPad(task.options, image);
emit ImageLoaded(task.id, scaled);
emit ImageLoaded(task.id, scaled, image);
return;
}
}
NextState(&task);
}
QImage AlbumCoverLoader::ScaleAndPad(const AlbumCoverLoaderOptions& options,
const QImage& image) {
if (image.isNull()) return image;
// Scale the image down
QImage copy;
if (options.scale_output_image_) {
copy = image.scaled(QSize(options.desired_height_, options.desired_height_),
Qt::KeepAspectRatio, Qt::SmoothTransformation);
} else {
copy = image;
}
if (!options.pad_output_image_) return copy;
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// Pad the image to height_ x height_
QImage padded_image(options.desired_height_, options.desired_height_,
QImage::Format_ARGB32);
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padded_image.fill(0);
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QPainter p(&padded_image);
p.drawImage((options.desired_height_ - copy.width()) / 2,
(options.desired_height_ - copy.height()) / 2, copy);
p.end();
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return padded_image;
}
QPixmap AlbumCoverLoader::TryLoadPixmap(const QString& automatic,
const QString& manual,
const QString& filename) {
QPixmap ret;
if (manual == Song::kManuallyUnsetCover) return ret;
if (!manual.isEmpty()) ret.load(manual);
if (ret.isNull()) {
if (automatic == Song::kEmbeddedCover && !filename.isNull())
ret = QPixmap::fromImage(
TagReaderClient::Instance()->LoadEmbeddedArtBlocking(filename));
else if (!automatic.isEmpty())
ret.load(automatic);
}
return ret;
}
quint64 AlbumCoverLoader::LoadImageAsync(const AlbumCoverLoaderOptions& options,
const Song& song) {
return LoadImageAsync(options, song.art_automatic(), song.art_manual(),
song.url().toLocalFile(), song.image());
}