1 files changed, 59 insertions, 0 deletions
diff --git a/src/multimediaquick/qquickimagepreviewprovider.cpp b/src/multimediaquick/qquickimagepreviewprovider.cpp
new file mode 100644
index 000000000..3b40c1c88
--- /dev/null
+++ b/src/multimediaquick/qquickimagepreviewprovider.cpp
@@ -0,0 +1,59 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qquickimagepreviewprovider_p.h"
+#include <QtCore/qmutex.h>
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+struct QQuickImagePreviewProviderPrivate
+{
+    QString id;
+    QImage image;
+    QMutex mutex;
+};
+
+Q_GLOBAL_STATIC(QQuickImagePreviewProviderPrivate, priv)
+
+QQuickImagePreviewProvider::QQuickImagePreviewProvider()
+: QQuickImageProvider(QQuickImageProvider::Image)
+{
+}
+
+QQuickImagePreviewProvider::~QQuickImagePreviewProvider()
+{
+    QQuickImagePreviewProviderPrivate *d = priv();
+    QMutexLocker lock(&d->mutex);
+    d->id.clear();
+    d->image = QImage();
+}
+
+QImage QQuickImagePreviewProvider::requestImage(const QString &id, QSize *size, const QSize& requestedSize)
+{
+    QQuickImagePreviewProviderPrivate *d = priv();
+    QMutexLocker lock(&d->mutex);
+
+    if (d->id != id)
+        return QImage();
+
+    QImage res = d->image;
+    if (!requestedSize.isEmpty())
+        res = res.scaled(requestedSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+
+    if (size)
+        *size = res.size();
+
+    return res;
+}
+
+void QQuickImagePreviewProvider::registerPreview(const QString &id, const QImage &preview)
+{
+    //only the last preview is kept
+    QQuickImagePreviewProviderPrivate *d = priv();
+    QMutexLocker lock(&d->mutex);
+    d->id = id;
+    d->image = preview;
+}
+
+QT_END_NAMESPACE