[kwin_wayland] Create a dedicated class for Compositor

Wraps the compositor interface.

src/wayland/compositor.cpp

+/********************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2014 Martin Gräßlin <mgraesslin@kde.org>
+
+This program 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 2 of the License, or
+(at your option) any later version.
+
+This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*********************************************************************/
+#include "compositor.h"
+#include "surface.h"
+
+#include <wayland-client-protocol.h>
+
+namespace KWin
+{
+namespace Wayland
+{
+
+Compositor::Compositor(QObject *parent)
+    : QObject(parent)
+    , m_compositor(nullptr)
+{
+}
+
+Compositor::~Compositor()
+{
+    release();
+}
+
+void Compositor::setup(wl_compositor *compositor)
+{
+    Q_ASSERT(compositor);
+    Q_ASSERT(!m_compositor);
+    m_compositor = compositor;
+}
+
+void Compositor::release()
+{
+    if (!m_compositor) {
+        return;
+    }
+    wl_compositor_destroy(m_compositor);
+    m_compositor = nullptr;
+}
+
+void Compositor::destroy()
+{
+    if (!m_compositor) {
+        return;
+    }
+    free(m_compositor);
+    m_compositor = nullptr;
+}
+
+Surface *Compositor::createSurface(QObject *parent)
+{
+    Q_ASSERT(isValid());
+    Surface *s = new Surface(parent);
+    s->setup(wl_compositor_create_surface(m_compositor));
+    return s;
+}
+
+}
+}

src/wayland/compositor.h

+/********************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2014 Martin Gräßlin <mgraesslin@kde.org>
+
+This program 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 2 of the License, or
+(at your option) any later version.
+
+This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*********************************************************************/
+#ifndef KWIN_WAYLAND_COMPOSITOR_H
+#define KWIN_WAYLAND_COMPOSITOR_H
+
+#include <QObject>
+
+struct wl_compositor;
+
+namespace KWin
+{
+namespace Wayland
+{
+
+class Surface;
+
+class Compositor : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Compositor(QObject *parent = nullptr);
+    virtual ~Compositor();
+
+    bool isValid() const {
+        return m_compositor != nullptr;
+    }
+    void setup(wl_compositor *compositor);
+    void release();
+    void destroy();
+
+    Surface *createSurface(QObject *parent = nullptr);
+
+    operator wl_compositor*() {
+        return m_compositor;
+    }
+    operator wl_compositor*() const {
+        return m_compositor;
+    }
+
+private:
+    wl_compositor *m_compositor;
+};
+
+}
+}
+
+#endif