1 files changed, 112 insertions, 0 deletions
diff --git a/coverdatabase.cpp b/coverdatabase.cpp
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+++ b/coverdatabase.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+    Logic paraphrased from Andreas Kling's repository at
+
+    http://qt.gitorious.org/~andreaskling/qt-labs/andreasklings-qtspotify
+*/
+
+#include "coverdatabase.h"
+#include "despotify_cpp.h"
+
+#include <QtCore/QFuture>
+#include <QtCore/QtConcurrentRun>
+#include <QtCore/QFutureWatcher>
+#include <QtGui/QPixmap>
+
+CoverDatabase::CoverDatabase(despotify_session *session, QObject *parent)
+    : QObject(parent), m_session(session)
+{
+}
+
+CoverDatabase::~CoverDatabase()
+{
+}
+
+void CoverDatabase::loadCover(const QByteArray &coverId)
+{
+    Q_ASSERT(m_session != 0);
+
+    m_currentCoverId = coverId;
+    if (m_pendingCovers.contains(coverId))
+        return;
+
+    {
+        QMutexLocker locker(&m_coverCacheLock);
+        QImage img = m_coverCache.value(coverId);
+
+        if (!img.isNull()) {
+            emit coverLoaded(QPixmap::fromImage(img));
+            return;
+        }
+    }
+
+    QFuture<QByteArray> imageDataFetcher = QtConcurrent::run(this, &CoverDatabase::fetchImageData,
+                                                             coverId);
+    QFutureWatcher<QByteArray> *imageDataFetcherWatcher = new QFutureWatcher<QByteArray>(this);
+    connect(imageDataFetcherWatcher, SIGNAL(finished()), this, SLOT(imageDataFetched()));
+    imageDataFetcherWatcher->setFuture(imageDataFetcher);
+}
+
+QByteArray CoverDatabase::fetchImageData(const QByteArray &coverId)
+{
+    Q_ASSERT(m_session != 0);
+
+    void *data;
+    int len;
+
+    {
+        /* despotify doesn't like having multiple get_image calls running */
+        static QMutex despotify_get_image_mutex;
+        QMutexLocker locker(&despotify_get_image_mutex);
+        data = despotify_get_image(m_session, const_cast<char *>(coverId.data()), &len);
+    }
+
+    free(data);
+
+    QImage img = data != 0 ? QImage::fromData(static_cast<const uchar *>(data), len, "JPEG") : QImage();
+    {
+        QMutexLocker locker(&m_coverCacheLock);
+        m_coverCache.insert(coverId, img);
+    }
+
+    return coverId;
+}
+
+void CoverDatabase::imageDataFetched()
+{
+    QFutureWatcher<QByteArray> *watcher = static_cast<QFutureWatcher<QByteArray> *>(sender());
+    Q_ASSERT(watcher != 0);
+
+    QByteArray coverId = watcher->result();
+    m_pendingCovers.remove(coverId);
+    {
+        QMutexLocker locker(&m_coverCacheLock);
+        if (coverId == m_currentCoverId)
+            emit coverLoaded(QPixmap::fromImage(m_coverCache.value(m_currentCoverId)));
+    }
+
+}