[kwin_wayland] Split out wl_shell and wl_shell_surface into dedicated classes

New classes Shell and ShellSurface are created. Both are in shell.[h|cpp]
to indicate their close relationship with the Shell having to create the
ShellSurface.

WaylandBackend is adjusted to hold a Shell* and ShellSurface* instead of
the lower level structs. This also required adjustements to the creation
of the Backend as it now doesn't set a default size any more. Thus the
backendReady signal may not be emitted before the initial configure
event arrived. This also makes it easier to support either the fullscreen
shell or wl_shell at the same time.

Of course a unit test is added for the two new classes. This needs to
be extended once we have more control over the mock Wayland server.

src/wayland/shell.cpp

@@ -0,0 +1,164 @@
+/********************************************************************
+ 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 "shell.h"
+#include "output.h"
+
+namespace KWin
+{
+namespace Wayland
+{
+
+Shell::Shell(QObject *parent)
+    : QObject(parent)
+    , m_shell(nullptr)
+{
+}
+
+Shell::~Shell()
+{
+    release();
+}
+
+void Shell::destroy()
+{
+    if (!m_shell) {
+        return;
+    }
+    emit interfaceAboutToBeDestroyed();
+    free(m_shell);
+    m_shell = nullptr;
+}
+
+void Shell::release()
+{
+    if (!m_shell) {
+        return;
+    }
+    emit interfaceAboutToBeReleased();
+    wl_shell_destroy(m_shell);
+    m_shell = nullptr;
+}
+
+void Shell::setup(wl_shell *shell)
+{
+    Q_ASSERT(!m_shell);
+    Q_ASSERT(shell);
+    m_shell = shell;
+}
+
+ShellSurface *Shell::createSurface(wl_surface *surface, QObject *parent)
+{
+    Q_ASSERT(isValid());
+    ShellSurface *s = new ShellSurface(parent);
+    connect(this, &Shell::interfaceAboutToBeReleased, s, &ShellSurface::release);
+    connect(this, &Shell::interfaceAboutToBeDestroyed, s, &ShellSurface::destroy);
+    s->setup(wl_shell_get_shell_surface(m_shell, surface));
+    return s;
+}
+
+ShellSurface::ShellSurface(QObject *parent)
+    : QObject(parent)
+    , m_surface(nullptr)
+    , m_size()
+{
+}
+
+ShellSurface::~ShellSurface()
+{
+    release();
+}
+
+void ShellSurface::release()
+{
+    if (!isValid()) {
+        return;
+    }
+    wl_shell_surface_destroy(m_surface);
+    m_surface = nullptr;
+}
+
+void ShellSurface::destroy()
+{
+    if (!isValid()) {
+        return;
+    }
+    free(m_surface);
+    m_surface = nullptr;
+}
+
+const struct wl_shell_surface_listener ShellSurface::s_listener = {
+    ShellSurface::pingCallback,
+    ShellSurface::configureCallback,
+    ShellSurface::popupDoneCallback
+};
+
+void ShellSurface::configureCallback(void *data, wl_shell_surface *shellSurface, uint32_t edges, int32_t width, int32_t height)
+{
+    Q_UNUSED(edges)
+    ShellSurface *s = reinterpret_cast<ShellSurface*>(data);
+    Q_ASSERT(s->m_surface == shellSurface);
+    s->setSize(QSize(width, height));
+}
+
+void ShellSurface::pingCallback(void *data, wl_shell_surface *shellSurface, uint32_t serial)
+{
+    ShellSurface *s = reinterpret_cast<ShellSurface*>(data);
+    Q_ASSERT(s->m_surface == shellSurface);
+    s->ping(serial);
+}
+
+void ShellSurface::popupDoneCallback(void *data, wl_shell_surface *shellSurface)
+{
+    // not needed, we don't have popups
+    Q_UNUSED(data)
+    Q_UNUSED(shellSurface)
+}
+
+void ShellSurface::setup(wl_shell_surface *surface)
+{
+    Q_ASSERT(surface);
+    Q_ASSERT(!m_surface);
+    m_surface = surface;
+    wl_shell_surface_add_listener(m_surface, &s_listener, this);
+}
+
+void ShellSurface::ping(uint32_t serial)
+{
+    wl_shell_surface_pong(m_surface, serial);
+    emit pinged();
+}
+
+void ShellSurface::setSize(const QSize &size)
+{
+    if (m_size == size) {
+        return;
+    }
+    m_size = size;
+    emit sizeChanged(size);
+}
+
+void ShellSurface::setFullscreen(Output *output)
+{
+    Q_ASSERT(isValid());
+    wl_shell_surface_set_fullscreen(m_surface, WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT, 0, output ? output->output() : nullptr);
+}
+
+}
+}

src/wayland/shell.h

@@ -0,0 +1,112 @@
+/********************************************************************
+ 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_SHELL_H
+#define KWIN_WAYLAND_SHELL_H
+
+#include <QObject>
+#include <QSize>
+
+#include <wayland-client-protocol.h>
+
+namespace KWin
+{
+namespace Wayland
+{
+class ShellSurface;
+class Output;
+
+class Shell : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Shell(QObject *parent = nullptr);
+    virtual ~Shell();
+
+    bool isValid() const {
+        return m_shell != nullptr;
+    }
+    void release();
+    void destroy();
+    void setup(wl_shell *shell);
+
+    ShellSurface *createSurface(wl_surface *surface, QObject *parent = nullptr);
+
+    operator wl_shell*() {
+        return m_shell;
+    }
+    operator wl_shell*() const {
+        return m_shell;
+    }
+
+Q_SIGNALS:
+    void interfaceAboutToBeReleased();
+    void interfaceAboutToBeDestroyed();
+
+private:
+    wl_shell *m_shell;
+};
+
+class ShellSurface : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QSize size READ size WRITE setSize NOTIFY sizeChanged)
+public:
+    explicit ShellSurface(QObject *parent);
+    virtual ~ShellSurface();
+
+    void release();
+    void destroy();
+    void setup(wl_shell_surface *surface);
+    QSize size() const {
+        return m_size;
+    }
+    void setSize(const QSize &size);
+
+    void setFullscreen(Output *output = nullptr);
+
+    bool isValid() const {
+        return m_surface != nullptr;
+    }
+    operator wl_shell_surface*() {
+        return m_surface;
+    }
+    operator wl_shell_surface*() const {
+        return m_surface;
+    }
+
+    static void pingCallback(void *data, struct wl_shell_surface *shellSurface, uint32_t serial);
+    static void configureCallback(void *data, struct wl_shell_surface *shellSurface, uint32_t edges, int32_t width, int32_t height);
+    static void popupDoneCallback(void *data, struct wl_shell_surface *shellSurface);
+
+Q_SIGNALS:
+    void pinged();
+    void sizeChanged(const QSize &);
+
+private:
+    void ping(uint32_t serial);
+    wl_shell_surface *m_surface;
+    QSize m_size;
+    static const struct wl_shell_surface_listener s_listener;
+};
+
+}
+}
+
+#endif