Introduce krfb-virtualmonitor

It implements a KWin protocol that is oriented towards serving a virtual
display specifically.
It requests KWin a stream that will act as a monitor that we can feed
into remote clients.

framebuffers/pipewire/screencasting.cpp

@@ -0,0 +1,136 @@
+/*
+    SPDX-FileCopyrightText: 2020 Aleix Pol Gonzalez <aleixpol@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+*/
+
+#include "screencasting.h"
+#include "qwayland-zkde-screencast-unstable-v1.h"
+#include <KWayland/Client/output.h>
+#include <KWayland/Client/plasmawindowmanagement.h>
+#include <KWayland/Client/registry.h>
+#include <QDebug>
+#include <QRect>
+
+using namespace KWayland::Client;
+
+class ScreencastingStreamPrivate : public QtWayland::zkde_screencast_stream_unstable_v1
+{
+public:
+    ScreencastingStreamPrivate(ScreencastingStream *q)
+        : q(q)
+    {
+    }
+    ~ScreencastingStreamPrivate()
+    {
+        close();
+        q->deleteLater();
+    }
+
+    void zkde_screencast_stream_unstable_v1_created(uint32_t node) override
+    {
+        m_nodeId = node;
+        Q_EMIT q->created(node);
+    }
+
+    void zkde_screencast_stream_unstable_v1_closed() override
+    {
+        Q_EMIT q->closed();
+    }
+
+    void zkde_screencast_stream_unstable_v1_failed(const QString &error) override
+    {
+        Q_EMIT q->failed(error);
+    }
+
+    uint m_nodeId = 0;
+    QPointer<ScreencastingStream> q;
+};
+
+ScreencastingStream::ScreencastingStream(QObject *parent)
+    : QObject(parent)
+    , d(new ScreencastingStreamPrivate(this))
+{
+}
+
+ScreencastingStream::~ScreencastingStream() = default;
+
+quint32 ScreencastingStream::nodeId() const
+{
+    return d->m_nodeId;
+}
+
+class ScreencastingPrivate : public QtWayland::zkde_screencast_unstable_v1
+{
+public:
+    ScreencastingPrivate(Registry *registry, int id, int version, Screencasting *q)
+        : QtWayland::zkde_screencast_unstable_v1(*registry, id, version)
+        , q(q)
+    {
+    }
+
+    ScreencastingPrivate(::zkde_screencast_unstable_v1 *screencasting, Screencasting *q)
+        : QtWayland::zkde_screencast_unstable_v1(screencasting)
+        , q(q)
+    {
+    }
+
+    ~ScreencastingPrivate()
+    {
+        destroy();
+    }
+
+    Screencasting *const q;
+};
+
+Screencasting::Screencasting(QObject *parent)
+    : QObject(parent)
+{
+}
+
+Screencasting::Screencasting(Registry *registry, int id, int version, QObject *parent)
+    : QObject(parent)
+    , d(new ScreencastingPrivate(registry, id, version, this))
+{
+}
+
+Screencasting::~Screencasting() = default;
+
+ScreencastingStream *Screencasting::createOutputStream(Output *output, CursorMode mode)
+{
+    auto stream = new ScreencastingStream(this);
+    stream->setObjectName(output->model());
+    stream->d->init(d->stream_output(*output, mode));
+    return stream;
+}
+
+ScreencastingStream *Screencasting::createWindowStream(PlasmaWindow *window, CursorMode mode)
+{
+    auto stream = createWindowStream(QString::fromUtf8(window->uuid()), mode);
+    stream->setObjectName(window->appId());
+    return stream;
+}
+
+ScreencastingStream *Screencasting::createWindowStream(const QString &uuid, CursorMode mode)
+{
+    auto stream = new ScreencastingStream(this);
+    stream->d->init(d->stream_window(uuid, mode));
+    return stream;
+}
+
+ScreencastingStream * Screencasting::createVirtualMonitorStream(const QString& name, const QSize& resolution, qreal dpr, Screencasting::CursorMode mode)
+{
+    auto stream = new ScreencastingStream(this);
+    stream->d->init(d->stream_virtual_output(name, resolution.width(), resolution.height(), wl_fixed_from_double(dpr), mode));
+    return stream;
+}
+
+void Screencasting::setup(::zkde_screencast_unstable_v1 *screencasting)
+{
+    d.reset(new ScreencastingPrivate(screencasting, this));
+}
+
+void Screencasting::destroy()
+{
+    d.reset(nullptr);
+}