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diff --git a/src/compositor/extensions/qwaylandviewporter.cpp b/src/compositor/extensions/qwaylandviewporter.cpp
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+++ b/src/compositor/extensions/qwaylandviewporter.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWaylandCompositor module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwaylandviewporter_p.h"
+
+#include <QtWaylandCompositor/QWaylandSurface>
+#include <QtWaylandCompositor/QWaylandCompositor>
+
+#include <QtWaylandCompositor/private/qwaylandsurface_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QWaylandViewporter
+    \inmodule QtWaylandCompositor
+    \since 5.13
+    \brief Provides an extension for surface resizing and cropping.
+
+    The QWaylandViewporter extension provides a way for clients to resize and crop surface
+    contents.
+
+    QWaylandViewporter corresponds to the Wayland interface, \c wp_viewporter.
+*/
+
+/*!
+    Constructs a QWaylandViewporter object.
+*/
+QWaylandViewporter::QWaylandViewporter()
+    : QWaylandCompositorExtensionTemplate<QWaylandViewporter>(*new QWaylandViewporterPrivate)
+{
+}
+
+/*!
+ * Constructs a QWaylandViewporter object for the provided \a compositor.
+ */
+QWaylandViewporter::QWaylandViewporter(QWaylandCompositor *compositor)
+    : QWaylandCompositorExtensionTemplate<QWaylandViewporter>(compositor, *new QWaylandViewporterPrivate())
+{
+}
+
+/*!
+    Initializes the extension.
+*/
+void QWaylandViewporter::initialize()
+{
+    Q_D(QWaylandViewporter);
+
+    QWaylandCompositorExtensionTemplate::initialize();
+    auto *compositor = static_cast<QWaylandCompositor *>(extensionContainer());
+    if (!compositor) {
+        qWarning() << "Failed to find QWaylandCompositor when initializing QWaylandViewporter";
+        return;
+    }
+    d->init(compositor->display(), 1);
+}
+
+/*!
+    Returns the Wayland interface for the QWaylandViewporter.
+*/
+const wl_interface *QWaylandViewporter::interface()
+{
+    return QWaylandViewporterPrivate::interface();
+}
+
+void QWaylandViewporterPrivate::wp_viewporter_destroy(Resource *resource)
+{
+    // Viewport objects are allowed ot outlive the viewporter
+    wl_resource_destroy(resource->handle);
+}
+
+void QWaylandViewporterPrivate::wp_viewporter_get_viewport(Resource *resource, uint id, wl_resource *surfaceResource)
+{
+    auto *surface = QWaylandSurface::fromResource(surfaceResource);
+    if (!surface) {
+        qWarning() << "Couldn't find surface for viewporter";
+        return;
+    }
+
+    auto *surfacePrivate = QWaylandSurfacePrivate::get(surface);
+    if (surfacePrivate->viewport) {
+        wl_resource_post_error(resource->handle, WP_VIEWPORTER_ERROR_VIEWPORT_EXISTS,
+                               "viewport already exists for surface");
+        return;
+    }
+
+    surfacePrivate->viewport = new Viewport(surface, resource->client(), id);
+}
+
+QWaylandViewporterPrivate::Viewport::Viewport(QWaylandSurface *surface, wl_client *client, int id)
+    : QtWaylandServer::wp_viewport(client, id, /*version*/ 1)
+    , m_surface(surface)
+{
+    Q_ASSERT(surface);
+}
+
+QWaylandViewporterPrivate::Viewport::~Viewport()
+{
+    if (m_surface) {
+        auto *surfacePrivate = QWaylandSurfacePrivate::get(m_surface);
+        Q_ASSERT(surfacePrivate->viewport == this);
+        surfacePrivate->viewport = nullptr;
+    }
+}
+
+// This function has to be called immediately after a surface is committed, before no
+// other client events have been dispatched, or we may incorrectly error out on an
+// incomplete pending state. See comment below.
+void QWaylandViewporterPrivate::Viewport::checkCommittedState()
+{
+    auto *surfacePrivate = QWaylandSurfacePrivate::get(m_surface);
+
+    // We can't use the current state for destination/source when checking,
+    // as that has fallbacks to the buffer size so we can't distinguish
+    // between the set/unset case. We use the pending state because no other
+    // requests has modified it yet.
+    QSize destination = surfacePrivate->pending.destinationSize;
+    QRectF source = surfacePrivate->pending.sourceGeometry;
+
+    if (!destination.isValid() && source.size() != source.size().toSize()) {
+        wl_resource_post_error(resource()->handle, error_bad_size,
+                               "non-integer size (%fx%f) with unset destination",
+                               source.width(), source.height());
+        return;
+    }
+
+    QRectF max = QRectF(QPointF(), m_surface->bufferSize() / m_surface->bufferScale());
+    // We can't use QRectF.contains, because that would return false for values on the border
+    if (max.united(source) != max) {
+        wl_resource_post_error(resource()->handle, error_out_of_buffer,
+                               "source %f,%f, %fx%f extends outside attached buffer %fx%f",
+                               source.x(), source.y(), source.width(), source.height(),
+                               max.width(), max.height());
+        return;
+    }
+}
+
+
+void QWaylandViewporterPrivate::Viewport::wp_viewport_destroy_resource(Resource *resource)
+{
+    Q_UNUSED(resource);
+    delete this;
+}
+
+void QWaylandViewporterPrivate::Viewport::wp_viewport_destroy(Resource *resource)
+{
+    if (m_surface) {
+        auto *surfacePrivate = QWaylandSurfacePrivate::get(m_surface);
+        surfacePrivate->pending.destinationSize = QSize();
+        surfacePrivate->pending.sourceGeometry = QRectF();
+    }
+    wl_resource_destroy(resource->handle);
+}
+
+void QWaylandViewporterPrivate::Viewport::wp_viewport_set_source(QtWaylandServer::wp_viewport::Resource *resource, wl_fixed_t x, wl_fixed_t y, wl_fixed_t width, wl_fixed_t height)
+{
+    Q_UNUSED(resource);
+
+    if (!m_surface) {
+        wl_resource_post_error(resource->handle, error_no_surface,
+                               "set_source requested for destroyed surface");
+        return;
+    }
+
+    QPointF position(wl_fixed_to_double(x), wl_fixed_to_double(y));
+    QSizeF size(wl_fixed_to_double(width), wl_fixed_to_double(height));
+    QRectF sourceGeometry(position, size);
+
+    if (sourceGeometry == QRectF(-1, -1, -1, -1)) {
+        auto *surfacePrivate = QWaylandSurfacePrivate::get(m_surface);
+        surfacePrivate->pending.sourceGeometry = QRectF();
+        return;
+    }
+
+    if (position.x() < 0 || position.y() < 0) {
+        wl_resource_post_error(resource->handle, error_bad_value,
+                               "negative position in set_source");
+        return;
+    }
+
+    if (!size.isValid()) {
+        wl_resource_post_error(resource->handle, error_bad_value,
+                               "negative size in set_source");
+        return;
+    }
+
+    auto *surfacePrivate = QWaylandSurfacePrivate::get(m_surface);
+    surfacePrivate->pending.sourceGeometry = sourceGeometry;
+}
+
+void QWaylandViewporterPrivate::Viewport::wp_viewport_set_destination(QtWaylandServer::wp_viewport::Resource *resource, int32_t width, int32_t height)
+{
+    Q_UNUSED(resource);
+
+    if (!m_surface) {
+        wl_resource_post_error(resource->handle, error_no_surface,
+                               "set_destination requested for destroyed surface");
+        return;
+    }
+
+    QSize destinationSize(width, height);
+    if (!destinationSize.isValid() && destinationSize != QSize(-1, -1)) {
+        wl_resource_post_error(resource->handle, error_bad_value,
+                               "negative size in set_destination");
+        return;
+    }
+    auto *surfacePrivate = QWaylandSurfacePrivate::get(m_surface);
+    surfacePrivate->pending.destinationSize = destinationSize;
+}
+
+QT_END_NAMESPACE