File indexing completed on 2024-05-19 16:34:59

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2012, 2013 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #pragma once
 
 #include "main.h"
 #include "utils/c_ptr.h"
 #include <kwinglobals.h>
 
 #include <QRect>
 #include <QRegion>
 #include <QVector>
 
 #include <xcb/composite.h>
 #include <xcb/randr.h>
 #include <xcb/xcb.h>
 
 #include <xcb/shm.h>
 
 class TestXcbSizeHints;
 
 namespace KWin
 {
 
 namespace Xcb
 {
 
 typedef xcb_window_t WindowId;
 
 uint32_t KWIN_EXPORT toXNative(qreal value);
 QRect KWIN_EXPORT toXNative(const QRectF &value);
 qreal KWIN_EXPORT fromXNative(int value);
 QRectF KWIN_EXPORT fromXNative(const QRect &value);
 QSizeF KWIN_EXPORT fromXNative(const QSize &value);
 
 /** Floors a given value to using the scale as a base
  *  Use when flooring to ints from Xwayland
  *  i.e floor(a/scale) * scale
  */
 QRectF KWIN_EXPORT nativeFloor(const QRectF &value);
 
 // forward declaration of methods
 static void defineCursor(xcb_window_t window, xcb_cursor_t cursor);
 static void setInputFocus(xcb_window_t window, uint8_t revertTo = XCB_INPUT_FOCUS_POINTER_ROOT, xcb_timestamp_t time = xTime());
 static void moveWindow(xcb_window_t window, const QPoint &pos);
 static void moveWindow(xcb_window_t window, uint32_t x, uint32_t y);
 static void lowerWindow(xcb_window_t window);
 static void selectInput(xcb_window_t window, uint32_t events);
 
 /**
  * @brief Variadic template to wrap an xcb request.
  *
  * This struct is part of the generic implementation to wrap xcb requests
  * and fetching their reply. Each request is represented by two templated
  * elements: WrapperData and Wrapper.
  *
  * The WrapperData defines the following types:
  * @li reply_type of the xcb request
  * @li cookie_type of the xcb request
  * @li function pointer type for the xcb request
  * @li function pointer type for the reply
  * This uses variadic template arguments thus it can be used to specify any
  * xcb request.
  *
  * As the WrapperData does not specify the actual function pointers one needs
  * to derive another struct which specifies the function pointer requestFunc and
  * the function pointer replyFunc as static constexpr of type reply_func and
  * reply_type respectively. E.g. for the command xcb_get_geometry:
  * @code
  * struct GeometryData : public WrapperData< xcb_get_geometry_reply_t, xcb_get_geometry_cookie_t, xcb_drawable_t >
  * {
  *    static constexpr request_func requestFunc = &xcb_get_geometry_unchecked;
  *    static constexpr reply_func replyFunc = &xcb_get_geometry_reply;
  * };
  * @endcode
  *
  * To simplify this definition the macro XCB_WRAPPER_DATA is provided.
  * For the same xcb command this looks like this:
  * @code
  * XCB_WRAPPER_DATA(GeometryData, xcb_get_geometry, xcb_drawable_t)
  * @endcode
  *
  * The derived WrapperData has to be passed as first template argument to Wrapper. The other
  * template arguments of Wrapper are the same variadic template arguments as passed into
  * WrapperData. This is ensured at compile time and will cause a compile error in case there
  * is a mismatch of the variadic template arguments passed to WrapperData and Wrapper.
  * Passing another type than a struct derived from WrapperData to Wrapper will result in a
  * compile error. The following code snippets won't compile:
  * @code
  * XCB_WRAPPER_DATA(GeometryData, xcb_get_geometry, xcb_drawable_t)
  * // fails with "static assertion failed: Argument miss-match between Wrapper and WrapperData"
  * class IncorrectArguments : public Wrapper<GeometryData, uint8_t>
  * {
  * public:
  *     IncorrectArguments() = default;
  *     IncorrectArguments(xcb_window_t window) : Wrapper<GeometryData, uint8_t>(window) {}
  * };
  *
  * // fails with "static assertion failed: Data template argument must be derived from WrapperData"
  * class WrapperDataDirectly : public Wrapper<WrapperData<xcb_get_geometry_reply_t, xcb_get_geometry_request_t, xcb_drawable_t>, xcb_drawable_t>
  * {
  * public:
  *     WrapperDataDirectly() = default;
  *     WrapperDataDirectly(xcb_window_t window) : Wrapper<WrapperData<xcb_get_geometry_reply_t, xcb_get_geometry_request_t, xcb_drawable_t>, xcb_drawable_t>(window) {}
  * };
  *
  * // fails with "static assertion failed: Data template argument must be derived from WrapperData"
  * struct FakeWrapperData
  * {
  *     typedef xcb_get_geometry_reply_t reply_type;
  *     typedef xcb_get_geometry_cookie_t cookie_type;
  *     typedef std::tuple<xcb_drawable_t> argument_types;
  *     typedef cookie_type (*request_func)(xcb_connection_t*, xcb_drawable_t);
  *     typedef reply_type *(*reply_func)(xcb_connection_t*, cookie_type, xcb_generic_error_t**);
  *     static constexpr std::size_t argumentCount = 1;
  *     static constexpr request_func requestFunc = &xcb_get_geometry_unchecked;
  *     static constexpr reply_func replyFunc = &xcb_get_geometry_reply;
  * };
  * class NotDerivedFromWrapperData : public Wrapper<FakeWrapperData, xcb_drawable_t>
  * {
  * public:
  *     NotDerivedFromWrapperData() = default;
  *     NotDerivedFromWrapperData(xcb_window_t window) : Wrapper<FakeWrapperData, xcb_drawable_t>(window) {}
  * };
  * @endcode
  *
  * The Wrapper provides an easy to use RAII API which calls the WrapperData's requestFunc in
  * the ctor and fetches the reply the first time it is used. In addition the dtor takes care
  * of freeing the reply if it got fetched, otherwise it discards the reply. The Wrapper can
  * be used as if it were the reply_type directly.
  *
  * There are several command wrappers defined which either subclass Wrapper to add methods to
  * simplify the usage of the result_type or use a typedef. To add a new typedef one can use the
  * macro XCB_WRAPPER which creates the WrapperData struct as XCB_WRAPPER_DATA does and the
  * typedef. E.g:
  * @code
  * XCB_WRAPPER(Geometry, xcb_get_geometry, xcb_drawable_t)
  * @endcode
  *
  * creates a typedef Geometry and the struct GeometryData.
  *
  * Overall this allows to simplify the Xcb usage. For example consider the
  * following xcb code snippet:
  * @code
  * xcb_window_t w; // some window
  * xcb_connection_t *c = connection();
  * const xcb_get_geometry_cookie_t cookie = xcb_get_geometry_unchecked(c, w);
  * // do other stuff
  * xcb_get_geometry_reply_t *reply = xcb_get_geometry_reply(c, cookie, nullptr);
  * if (reply) {
  *     reply->x; // do something with the geometry
  * }
  * free(reply);
  * @endcode
  *
  * With the help of the Wrapper class this can be simplified to:
  * @code
  * xcb_window_t w; // some window
  * Xcb::Geometry geo(w);
  * if (!geo.isNull()) {
  *     geo->x; // do something with the geometry
  * }
  * @endcode
  *
  * @see XCB_WRAPPER_DATA
  * @see XCB_WRAPPER
  * @see Wrapper
  * @see WindowAttributes
  * @see OverlayWindow
  * @see WindowGeometry
  * @see Tree
  * @see CurrentInput
  * @see TransientFor
  */
 template<typename Reply,
          typename Cookie,
          typename... Args>
 struct WrapperData
 {
     /**
      * @brief The type returned by the xcb reply function.
      */
     typedef Reply reply_type;
     /**
      * @brief The type returned by the xcb request function.
      */
     typedef Cookie cookie_type;
     /**
      * @brief Variadic arguments combined as a std::tuple.
      * @internal Used for verifying the arguments.
      */
     typedef std::tuple<Args...> argument_types;
     /**
      * @brief The function pointer definition for the xcb request function.
      */
     typedef Cookie (*request_func)(xcb_connection_t *, Args...);
     /**
      * @brief The function pointer definition for the xcb reply function.
      */
     typedef Reply *(*reply_func)(xcb_connection_t *, Cookie, xcb_generic_error_t **);
     /**
      * @brief Number of variadic arguments.
      * @internal Used for verifying the arguments.
      */
     static constexpr std::size_t argumentCount = sizeof...(Args);
 };
 
 /**
  * @brief Partial template specialization for WrapperData with no further arguments.
  *
  * This will be used for xcb requests just taking the xcb_connection_t* argument.
  */
 template<typename Reply,
          typename Cookie>
 struct WrapperData<Reply, Cookie>
 {
     typedef Reply reply_type;
     typedef Cookie cookie_type;
     typedef std::tuple<> argument_types;
     typedef Cookie (*request_func)(xcb_connection_t *);
     typedef Reply *(*reply_func)(xcb_connection_t *, Cookie, xcb_generic_error_t **);
     static constexpr std::size_t argumentCount = 0;
 };
 
 /**
  * @brief Abstract base class for the wrapper.
  *
  * This class contains the complete functionality of the Wrapper. It's only an abstract
  * base class to provide partial template specialization for more specific constructors.
  */
 template<typename Data>
 class AbstractWrapper
 {
 public:
     typedef typename Data::cookie_type Cookie;
     typedef typename Data::reply_type Reply;
     virtual ~AbstractWrapper()
     {
         cleanup();
     }
     inline AbstractWrapper &operator=(const AbstractWrapper &other)
     {
         if (this != &other) {
             // if we had managed a reply, free it
             cleanup();
             // copy members
             m_retrieved = other.m_retrieved;
             m_cookie = other.m_cookie;
             m_window = other.m_window;
             m_reply = other.m_reply;
             // take over the responsibility for the reply pointer
             takeFromOther(const_cast<AbstractWrapper &>(other));
         }
         return *this;
     }
 
     inline const Reply *operator->()
     {
         getReply();
         return m_reply;
     }
     inline bool isNull()
     {
         getReply();
         return m_reply == nullptr;
     }
     inline bool isNull() const
     {
         const_cast<AbstractWrapper *>(this)->getReply();
         return m_reply == NULL;
     }
     inline operator bool()
     {
         return !isNull();
     }
     inline operator bool() const
     {
         return !isNull();
     }
     inline const Reply *data()
     {
         getReply();
         return m_reply;
     }
     inline const Reply *data() const
     {
         const_cast<AbstractWrapper *>(this)->getReply();
         return m_reply;
     }
     inline WindowId window() const
     {
         return m_window;
     }
     inline bool isRetrieved() const
     {
         return m_retrieved;
     }
     /**
      * Returns the value of the reply pointer referenced by this object. The reply pointer of
      * this object will be reset to null. Calling any method which requires the reply to be valid
      * will crash.
      *
      * Callers of this function take ownership of the pointer.
      */
     inline Reply *take()
     {
         getReply();
         Reply *ret = m_reply;
         m_reply = nullptr;
         m_window = XCB_WINDOW_NONE;
         return ret;
     }
 
 protected:
     AbstractWrapper()
         : m_retrieved(false)
         , m_window(XCB_WINDOW_NONE)
         , m_reply(nullptr)
     {
         m_cookie.sequence = 0;
     }
     explicit AbstractWrapper(WindowId window, Cookie cookie)
         : m_retrieved(false)
         , m_cookie(cookie)
         , m_window(window)
         , m_reply(nullptr)
     {
     }
     explicit AbstractWrapper(const AbstractWrapper &other)
         : m_retrieved(other.m_retrieved)
         , m_cookie(other.m_cookie)
         , m_window(other.m_window)
         , m_reply(nullptr)
     {
         takeFromOther(const_cast<AbstractWrapper &>(other));
     }
     void getReply()
     {
         if (m_retrieved || !m_cookie.sequence) {
             return;
         }
         m_reply = Data::replyFunc(connection(), m_cookie, nullptr);
         m_retrieved = true;
     }
 
 private:
     inline void cleanup()
     {
         if (!m_retrieved && m_cookie.sequence) {
             xcb_discard_reply(connection(), m_cookie.sequence);
         } else if (m_reply) {
             free(m_reply);
         }
     }
     inline void takeFromOther(AbstractWrapper &other)
     {
         if (m_retrieved) {
             m_reply = other.take();
         } else {
             // ensure that other object doesn't try to get the reply or discards it in the dtor
             other.m_retrieved = true;
             other.m_window = XCB_WINDOW_NONE;
         }
     }
     bool m_retrieved;
     Cookie m_cookie;
     WindowId m_window;
     Reply *m_reply;
 };
 
 /**
  * @brief Template to compare the arguments of two std::tuple.
  *
  * @internal Used by static_assert in Wrapper
  */
 template<typename T1, typename T2, std::size_t I>
 struct tupleCompare
 {
     typedef typename std::tuple_element<I, T1>::type tuple1Type;
     typedef typename std::tuple_element<I, T2>::type tuple2Type;
     /**
      * @c true if both tuple have the same arguments, @c false otherwise.
      */
     static constexpr bool value = std::is_same<tuple1Type, tuple2Type>::value && tupleCompare<T1, T2, I - 1>::value;
 };
 
 /**
  * @brief Recursive template case for first tuple element.
  */
 template<typename T1, typename T2>
 struct tupleCompare<T1, T2, 0>
 {
     typedef typename std::tuple_element<0, T1>::type tuple1Type;
     typedef typename std::tuple_element<0, T2>::type tuple2Type;
     static constexpr bool value = std::is_same<tuple1Type, tuple2Type>::value;
 };
 
 /**
  * @brief Wrapper taking a WrapperData as first template argument and xcb request args as variadic args.
  */
 template<typename Data, typename... Args>
 class Wrapper : public AbstractWrapper<Data>
 {
 public:
     static_assert(!std::is_same<Data, Xcb::WrapperData<typename Data::reply_type, typename Data::cookie_type, Args...>>::value,
                   "Data template argument must be derived from WrapperData");
     static_assert(std::is_base_of<Xcb::WrapperData<typename Data::reply_type, typename Data::cookie_type, Args...>, Data>::value,
                   "Data template argument must be derived from WrapperData");
     static_assert(sizeof...(Args) == Data::argumentCount,
                   "Wrapper and WrapperData need to have same template argument count");
     static_assert(tupleCompare<std::tuple<Args...>, typename Data::argument_types, sizeof...(Args) - 1>::value,
                   "Argument miss-match between Wrapper and WrapperData");
     Wrapper() = default;
     explicit Wrapper(Args... args)
         : AbstractWrapper<Data>(XCB_WINDOW_NONE, Data::requestFunc(connection(), args...))
     {
     }
     explicit Wrapper(xcb_window_t w, Args... args)
         : AbstractWrapper<Data>(w, Data::requestFunc(connection(), args...))
     {
     }
 };
 
 /**
  * @brief Template specialization for xcb_window_t being first variadic argument.
  */
 template<typename Data, typename... Args>
 class Wrapper<Data, xcb_window_t, Args...> : public AbstractWrapper<Data>
 {
 public:
     static_assert(!std::is_same<Data, Xcb::WrapperData<typename Data::reply_type, typename Data::cookie_type, xcb_window_t, Args...>>::value,
                   "Data template argument must be derived from WrapperData");
     static_assert(std::is_base_of<Xcb::WrapperData<typename Data::reply_type, typename Data::cookie_type, xcb_window_t, Args...>, Data>::value,
                   "Data template argument must be derived from WrapperData");
     static_assert(sizeof...(Args) + 1 == Data::argumentCount,
                   "Wrapper and WrapperData need to have same template argument count");
     static_assert(tupleCompare<std::tuple<xcb_window_t, Args...>, typename Data::argument_types, sizeof...(Args)>::value,
                   "Argument miss-match between Wrapper and WrapperData");
     Wrapper() = default;
     explicit Wrapper(xcb_window_t w, Args... args)
         : AbstractWrapper<Data>(w, Data::requestFunc(connection(), w, args...))
     {
     }
 };
 
 /**
  * @brief Template specialization for no variadic arguments.
  *
  * It's needed to prevent ambiguous constructors being generated.
  */
 template<typename Data>
 class Wrapper<Data> : public AbstractWrapper<Data>
 {
 public:
     static_assert(!std::is_same<Data, Xcb::WrapperData<typename Data::reply_type, typename Data::cookie_type>>::value,
                   "Data template argument must be derived from WrapperData");
     static_assert(std::is_base_of<Xcb::WrapperData<typename Data::reply_type, typename Data::cookie_type>, Data>::value,
                   "Data template argument must be derived from WrapperData");
     static_assert(Data::argumentCount == 0, "Wrapper for no arguments constructed with WrapperData with arguments");
     explicit Wrapper()
         : AbstractWrapper<Data>(XCB_WINDOW_NONE, Data::requestFunc(connection()))
     {
     }
 };
 
 class Atom
 {
 public:
     explicit Atom(const QByteArray &name, bool onlyIfExists = false, xcb_connection_t *c = connection())
         : m_connection(c)
         , m_retrieved(false)
         , m_cookie(xcb_intern_atom_unchecked(m_connection, onlyIfExists, name.length(), name.constData()))
         , m_atom(XCB_ATOM_NONE)
         , m_name(name)
     {
     }
     Atom() = delete;
     Atom(const Atom &) = delete;
 
     ~Atom()
     {
         if (!m_retrieved && m_cookie.sequence) {
             xcb_discard_reply(m_connection, m_cookie.sequence);
         }
     }
 
     operator xcb_atom_t() const
     {
         (const_cast<Atom *>(this))->getReply();
         return m_atom;
     }
     bool isValid()
     {
         getReply();
         return m_atom != XCB_ATOM_NONE;
     }
     bool isValid() const
     {
         (const_cast<Atom *>(this))->getReply();
         return m_atom != XCB_ATOM_NONE;
     }
 
     inline const QByteArray &name() const
     {
         return m_name;
     }
 
     void getReply()
     {
         if (m_retrieved || !m_cookie.sequence) {
             return;
         }
         UniqueCPtr<xcb_intern_atom_reply_t> reply(xcb_intern_atom_reply(m_connection, m_cookie, nullptr));
         if (reply) {
             m_atom = reply->atom;
         }
         m_retrieved = true;
     }
 
 private:
     xcb_connection_t *m_connection;
     bool m_retrieved;
     xcb_intern_atom_cookie_t m_cookie;
     xcb_atom_t m_atom;
     QByteArray m_name;
 };
 
 /**
  * @brief Macro to create the WrapperData subclass.
  *
  * Creates a struct with name @p __NAME__ for the xcb request identified by @p __REQUEST__.
  * The variadic arguments are used to pass as template arguments to the WrapperData.
  *
  * The @p __REQUEST__ is the common prefix of the cookie type, reply type, request function and
  * reply function. E.g. "xcb_get_geometry" is used to create:
  * @li cookie type xcb_get_geometry_cookie_t
  * @li reply type xcb_get_geometry_reply_t
  * @li request function pointer xcb_get_geometry_unchecked
  * @li reply function pointer xcb_get_geometry_reply
  *
  * @param __NAME__ The name of the WrapperData subclass
  * @param __REQUEST__ The name of the xcb request, e.g. xcb_get_geometry
  * @param __VA_ARGS__ The variadic template arguments, e.g. xcb_drawable_t
  * @see XCB_WRAPPER
  */
 #define XCB_WRAPPER_DATA(__NAME__, __REQUEST__, ...)                                                 \
     struct __NAME__ : public WrapperData<__REQUEST__##_reply_t, __REQUEST__##_cookie_t, __VA_ARGS__> \
     {                                                                                                \
         static constexpr request_func requestFunc = &__REQUEST__##_unchecked;                        \
         static constexpr reply_func replyFunc = &__REQUEST__##_reply;                                \
     };
 
 /**
  * @brief Macro to create Wrapper typedef and WrapperData.
  *
  * This macro expands the XCB_WRAPPER_DATA macro and creates an additional
  * typedef for Wrapper with name @p __NAME__. The created WrapperData is also derived
  * from @p __NAME__ with "Data" as suffix.
  *
  * @param __NAME__ The name for the Wrapper typedef
  * @param __REQUEST__ The name of the xcb request, passed to XCB_WRAPPER_DATA
  * @param __VA_ARGS__ The variadic template arguments for Wrapper and WrapperData
  * @see XCB_WRAPPER_DATA
  */
 #define XCB_WRAPPER(__NAME__, __REQUEST__, ...)                \
     XCB_WRAPPER_DATA(__NAME__##Data, __REQUEST__, __VA_ARGS__) \
     typedef Wrapper<__NAME__##Data, __VA_ARGS__> __NAME__;
 
 XCB_WRAPPER(WindowAttributes, xcb_get_window_attributes, xcb_window_t)
 XCB_WRAPPER(OverlayWindow, xcb_composite_get_overlay_window, xcb_window_t)
 
 XCB_WRAPPER_DATA(GeometryData, xcb_get_geometry, xcb_drawable_t)
 class WindowGeometry : public Wrapper<GeometryData, xcb_window_t>
 {
 public:
     WindowGeometry()
         : Wrapper<GeometryData, xcb_window_t>()
     {
     }
     explicit WindowGeometry(xcb_window_t window)
         : Wrapper<GeometryData, xcb_window_t>(window)
     {
     }
 
     inline QRectF rect()
     {
         const xcb_get_geometry_reply_t *geometry = data();
         if (!geometry) {
             return QRect();
         }
         return QRectF(Xcb::fromXNative(geometry->x), Xcb::fromXNative(geometry->y), Xcb::fromXNative(geometry->width), Xcb::fromXNative(geometry->height));
     }
 
     inline QSizeF size()
     {
         const xcb_get_geometry_reply_t *geometry = data();
         if (!geometry) {
             return QSize();
         }
         return QSizeF(Xcb::fromXNative(geometry->width), Xcb::fromXNative(geometry->height));
     }
 };
 
 XCB_WRAPPER_DATA(TreeData, xcb_query_tree, xcb_window_t)
 class Tree : public Wrapper<TreeData, xcb_window_t>
 {
 public:
     explicit Tree(WindowId window)
         : Wrapper<TreeData, xcb_window_t>(window)
     {
     }
 
     inline WindowId *children()
     {
         if (isNull() || data()->children_len == 0) {
             return nullptr;
         }
         return xcb_query_tree_children(data());
     }
     inline xcb_window_t parent()
     {
         if (isNull()) {
             return XCB_WINDOW_NONE;
         }
         return (*this)->parent;
     }
 };
 
 XCB_WRAPPER(Pointer, xcb_query_pointer, xcb_window_t)
 
 struct CurrentInputData : public WrapperData<xcb_get_input_focus_reply_t, xcb_get_input_focus_cookie_t>
 {
     static constexpr request_func requestFunc = &xcb_get_input_focus_unchecked;
     static constexpr reply_func replyFunc = &xcb_get_input_focus_reply;
 };
 
 class CurrentInput : public Wrapper<CurrentInputData>
 {
 public:
     CurrentInput()
         : Wrapper<CurrentInputData>()
     {
     }
 
     inline xcb_window_t window()
     {
         if (isNull()) {
             return XCB_WINDOW_NONE;
         }
         return (*this)->focus;
     }
 };
 
 struct QueryKeymapData : public WrapperData<xcb_query_keymap_reply_t, xcb_query_keymap_cookie_t>
 {
     static constexpr request_func requestFunc = &xcb_query_keymap_unchecked;
     static constexpr reply_func replyFunc = &xcb_query_keymap_reply;
 };
 
 class QueryKeymap : public Wrapper<QueryKeymapData>
 {
 public:
     QueryKeymap()
         : Wrapper<QueryKeymapData>()
     {
     }
 };
 
 struct ModifierMappingData : public WrapperData<xcb_get_modifier_mapping_reply_t, xcb_get_modifier_mapping_cookie_t>
 {
     static constexpr request_func requestFunc = &xcb_get_modifier_mapping_unchecked;
     static constexpr reply_func replyFunc = &xcb_get_modifier_mapping_reply;
 };
 
 class ModifierMapping : public Wrapper<ModifierMappingData>
 {
 public:
     ModifierMapping()
         : Wrapper<ModifierMappingData>()
     {
     }
 
     inline xcb_keycode_t *keycodes()
     {
         if (isNull()) {
             return nullptr;
         }
         return xcb_get_modifier_mapping_keycodes(data());
     }
     inline int size()
     {
         if (isNull()) {
             return 0;
         }
         return xcb_get_modifier_mapping_keycodes_length(data());
     }
 };
 
 XCB_WRAPPER_DATA(PropertyData, xcb_get_property, uint8_t, xcb_window_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t)
 class Property : public Wrapper<PropertyData, uint8_t, xcb_window_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t>
 {
 public:
     Property()
         : Wrapper<PropertyData, uint8_t, xcb_window_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t>()
         , m_type(XCB_ATOM_NONE)
     {
     }
     Property(const Property &other)
         : Wrapper<PropertyData, uint8_t, xcb_window_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t>(other)
         , m_type(other.m_type)
     {
     }
     explicit Property(uint8_t _delete, xcb_window_t window, xcb_atom_t property, xcb_atom_t type, uint32_t long_offset, uint32_t long_length)
         : Wrapper<PropertyData, uint8_t, xcb_window_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t>(window, _delete, window, property, type, long_offset, long_length)
         , m_type(type)
     {
     }
     Property &operator=(const Property &other)
     {
         Wrapper<PropertyData, uint8_t, xcb_window_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t>::operator=(other);
         m_type = other.m_type;
         return *this;
     }
 
     /**
      * @brief Overloaded method for convenience.
      *
      * Uses the type which got passed into the ctor and derives the format from the sizeof(T).
      * Note: for the automatic format detection the size of the type T may not vary between
      * architectures. Thus one needs to use e.g. uint32_t instead of long. In general all xcb
      * data types can be used, all Xlib data types can not be used.
      *
      * @param defaultValue The default value to return in case of error
      * @param ok Set to @c false in case of error, @c true in case of success
      * @return The read value or @p defaultValue in error case
      */
     template<typename T>
     inline typename std::enable_if<!std::is_pointer<T>::value, T>::type value(T defaultValue = T(), bool *ok = nullptr)
     {
         return value<T>(sizeof(T) * 8, m_type, defaultValue, ok);
     }
     /**
      * @brief Reads the property as a POD type.
      *
      * Returns the first value of the property data. In case of @p format or @p type mismatch
      * the @p defaultValue is returned. The optional argument @p ok is set
      * to @c false in case of error and to @c true in case of successful reading of
      * the property.
      *
      * @param format The expected format of the property value, e.g. 32 for XCB_ATOM_CARDINAL
      * @param type The expected type of the property value, e.g. XCB_ATOM_CARDINAL
      * @param defaultValue The default value to return in case of error
      * @param ok Set to @c false in case of error, @c true in case of success
      * @return The read value or @p defaultValue in error case
      */
     template<typename T>
     inline typename std::enable_if<!std::is_pointer<T>::value, T>::type value(uint8_t format, xcb_atom_t type, T defaultValue = T(), bool *ok = nullptr)
     {
         T *reply = value<T *>(format, type, nullptr, ok);
         if (!reply) {
             return defaultValue;
         }
         return reply[0];
     }
     /**
      * @brief Overloaded method for convenience.
      *
      * Uses the type which got passed into the ctor and derives the format from the sizeof(T).
      * Note: for the automatic format detection the size of the type T may not vary between
      * architectures. Thus one needs to use e.g. uint32_t instead of long. In general all xcb
      * data types can be used, all Xlib data types can not be used.
      *
      * @param defaultValue The default value to return in case of error
      * @param ok Set to @c false in case of error, @c true in case of success
      * @return The read value or @p defaultValue in error case
      */
     template<typename T>
     inline typename std::enable_if<std::is_pointer<T>::value, T>::type value(T defaultValue = nullptr, bool *ok = nullptr)
     {
         return value<T>(sizeof(typename std::remove_pointer<T>::type) * 8, m_type, defaultValue, ok);
     }
     /**
      * @brief Reads the property as an array of T.
      *
      * This method is an overload for the case that T is a pointer type.
      *
      * Return the property value casted to the pointer type T. In case of @p format
      * or @p type mismatch the @p defaultValue is returned. Also if the value length
      * is @c 0 the @p defaultValue is returned. The optional argument @p ok is set
      * to @c false in case of error and to @c true in case of successful reading of
      * the property. Ok will always be true if the property exists and has been
      * successfully read, even in the case the property is empty and its length is 0
      *
      * @param format The expected format of the property value, e.g. 32 for XCB_ATOM_CARDINAL
      * @param type The expected type of the property value, e.g. XCB_ATOM_CARDINAL
      * @param defaultValue The default value to return in case of error
      * @param ok Set to @c false in case of error, @c true in case of success
      * @return The read value or @p defaultValue in error case
      */
     template<typename T>
     inline typename std::enable_if<std::is_pointer<T>::value, T>::type value(uint8_t format, xcb_atom_t type, T defaultValue = nullptr, bool *ok = nullptr)
     {
         if (ok) {
             *ok = false;
         }
         const PropertyData::reply_type *reply = data();
         if (!reply) {
             return defaultValue;
         }
         if (reply->type != type) {
             return defaultValue;
         }
         if (reply->format != format) {
             return defaultValue;
         }
 
         if (ok) {
             *ok = true;
         }
         if (xcb_get_property_value_length(reply) == 0) {
             return defaultValue;
         }
 
         return reinterpret_cast<T>(xcb_get_property_value(reply));
     }
     /**
      * @brief Reads the property as string and returns a QByteArray.
      *
      * In case of error this method returns a null QByteArray.
      */
     inline QByteArray toByteArray(uint8_t format = 8, xcb_atom_t type = XCB_ATOM_STRING, bool *ok = nullptr)
     {
         bool valueOk = false;
         const char *reply = value<const char *>(format, type, nullptr, &valueOk);
         if (ok) {
             *ok = valueOk;
         }
 
         if (valueOk && !reply) {
             return QByteArray("", 0); // valid, not null, but empty data
         } else if (!valueOk) {
             return QByteArray(); // Property not found, data empty and null
         }
         return QByteArray(reply, xcb_get_property_value_length(data()));
     }
     /**
      * @brief Overloaded method for convenience.
      */
     inline QByteArray toByteArray(bool *ok)
     {
         return toByteArray(8, m_type, ok);
     }
     /**
      * @brief Reads the property as a boolean value.
      *
      * If the property reply length is @c 1 the first element is interpreted as a boolean
      * value returning @c true for any value unequal to @c 0 and @c false otherwise.
      *
      * In case of error this method returns @c false. Thus it is not possible to distinguish
      * between error case and a read @c false value. Use the optional argument @p ok to
      * distinguish the error case.
      *
      * @param format Expected format. Defaults to 32.
      * @param type Expected type Defaults to XCB_ATOM_CARDINAL.
      * @param ok Set to @c false in case of error, @c true in case of success
      * @return bool The first element interpreted as a boolean value or @c false in error case
      * @see value
      */
     inline bool toBool(uint8_t format = 32, xcb_atom_t type = XCB_ATOM_CARDINAL, bool *ok = nullptr)
     {
         bool *reply = value<bool *>(format, type, nullptr, ok);
         if (!reply) {
             return false;
         }
         if (data()->value_len != 1) {
             if (ok) {
                 *ok = false;
             }
             return false;
         }
         return reply[0] != 0;
     }
     /**
      * @brief Overloaded method for convenience.
      */
     inline bool toBool(bool *ok)
     {
         return toBool(32, m_type, ok);
     }
 
 private:
     xcb_atom_t m_type;
 };
 
 class StringProperty : public Property
 {
 public:
     StringProperty() = default;
     explicit StringProperty(xcb_window_t w, xcb_atom_t p)
         : Property(false, w, p, XCB_ATOM_STRING, 0, 10000)
     {
     }
     operator QByteArray()
     {
         return toByteArray();
     }
 };
 
 class TransientFor : public Property
 {
 public:
     explicit TransientFor(WindowId window)
         : Property(0, window, XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 0, 1)
     {
     }
 
     /**
      * @brief Fill given window pointer with the WM_TRANSIENT_FOR property of a window.
      * @param prop WM_TRANSIENT_FOR property value.
      * @returns @c true on success, @c false otherwise
      */
     inline bool getTransientFor(WindowId *prop)
     {
         WindowId *windows = value<WindowId *>();
         if (!windows) {
             return false;
         }
 
         *prop = *windows;
         return true;
     }
 };
 
 class GeometryHints
 {
 public:
     GeometryHints() = default;
     void init(xcb_window_t window)
     {
         Q_ASSERT(window);
         if (m_window) {
             // already initialized
             return;
         }
         m_window = window;
         fetch();
     }
     void fetch()
     {
         if (!m_window) {
             return;
         }
         m_sizeHints = nullptr;
         m_hints = NormalHints(m_window);
     }
     void read()
     {
         m_sizeHints = m_hints.sizeHints();
     }
 
     bool hasPosition() const
     {
         return testFlag(NormalHints::SizeHints::UserPosition) || testFlag(NormalHints::SizeHints::ProgramPosition);
     }
     bool hasSize() const
     {
         return testFlag(NormalHints::SizeHints::UserSize) || testFlag(NormalHints::SizeHints::ProgramSize);
     }
     bool hasMinSize() const
     {
         return testFlag(NormalHints::SizeHints::MinSize);
     }
     bool hasMaxSize() const
     {
         return testFlag(NormalHints::SizeHints::MaxSize);
     }
     bool hasResizeIncrements() const
     {
         return testFlag(NormalHints::SizeHints::ResizeIncrements);
     }
     bool hasAspect() const
     {
         return testFlag(NormalHints::SizeHints::Aspect);
     }
     bool hasBaseSize() const
     {
         return testFlag(NormalHints::SizeHints::BaseSize);
     }
     bool hasWindowGravity() const
     {
         return testFlag(NormalHints::SizeHints::WindowGravity);
     }
     QSizeF maxSize() const
     {
         if (!hasMaxSize()) {
             return QSize(INT_MAX, INT_MAX);
         }
         const QSize size(std::max(m_sizeHints->maxWidth, 1), std::max(m_sizeHints->maxHeight, 1));
         return fromXNative(size);
     }
     QSizeF minSize() const
     {
         if (!hasMinSize()) {
             // according to ICCCM 4.1.23 base size should be used as a fallback
             return baseSize();
         }
         const QSize size(m_sizeHints->minWidth, m_sizeHints->minHeight);
         return fromXNative(size);
     }
     QSizeF baseSize() const
     {
         // Note: not using minSize as fallback
         if (!hasBaseSize()) {
             return QSize(0, 0);
         }
         const QSize size(m_sizeHints->baseWidth, m_sizeHints->baseHeight);
         return fromXNative(size);
     }
     QSizeF resizeIncrements() const
     {
         if (!hasResizeIncrements()) {
             return fromXNative(QSize(1, 1));
         }
         return Xcb::fromXNative(QSize(std::max(m_sizeHints->widthInc, 1), std::max(m_sizeHints->heightInc, 1)));
     }
     xcb_gravity_t windowGravity() const
     {
         if (!hasWindowGravity()) {
             return XCB_GRAVITY_NORTH_WEST;
         }
         return xcb_gravity_t(m_sizeHints->winGravity);
     }
     QSize minAspect() const
     {
         if (!hasAspect()) {
             return QSize(1, INT_MAX);
         }
         // prevent division by zero
         return QSize(m_sizeHints->minAspect[0], std::max(m_sizeHints->minAspect[1], 1));
     }
     QSize maxAspect() const
     {
         if (!hasAspect()) {
             return QSize(INT_MAX, 1);
         }
         // prevent division by zero
         return QSize(m_sizeHints->maxAspect[0], std::max(m_sizeHints->maxAspect[1], 1));
     }
 
 private:
     /**
      * NormalHints as specified in ICCCM 4.1.2.3.
      */
     class NormalHints : public Property
     {
     public:
         struct SizeHints
         {
             enum Flags {
                 UserPosition = 1,
                 UserSize = 2,
                 ProgramPosition = 4,
                 ProgramSize = 8,
                 MinSize = 16,
                 MaxSize = 32,
                 ResizeIncrements = 64,
                 Aspect = 128,
                 BaseSize = 256,
                 WindowGravity = 512
             };
             qint32 flags = 0;
             qint32 pad[4] = {0, 0, 0, 0};
             qint32 minWidth = 0;
             qint32 minHeight = 0;
             qint32 maxWidth = 0;
             qint32 maxHeight = 0;
             qint32 widthInc = 0;
             qint32 heightInc = 0;
             qint32 minAspect[2] = {0, 0};
             qint32 maxAspect[2] = {0, 0};
             qint32 baseWidth = 0;
             qint32 baseHeight = 0;
             qint32 winGravity = 0;
         };
         explicit NormalHints()
             : Property(){};
         explicit NormalHints(WindowId window)
             : Property(0, window, XCB_ATOM_WM_NORMAL_HINTS, XCB_ATOM_WM_SIZE_HINTS, 0, 18)
         {
         }
         inline SizeHints *sizeHints()
         {
             return value<SizeHints *>(32, XCB_ATOM_WM_SIZE_HINTS, nullptr);
         }
     };
     friend TestXcbSizeHints;
     bool testFlag(NormalHints::SizeHints::Flags flag) const
     {
         if (!m_window || !m_sizeHints) {
             return false;
         }
         return m_sizeHints->flags & flag;
     }
     xcb_window_t m_window = XCB_WINDOW_NONE;
     NormalHints m_hints;
     NormalHints::SizeHints *m_sizeHints = nullptr;
 };
 
 class MotifHints
 {
 public:
     MotifHints(xcb_atom_t atom)
         : m_atom(atom)
     {
     }
     void init(xcb_window_t window)
     {
         Q_ASSERT(window);
         if (m_window) {
             // already initialized
             return;
         }
         m_window = window;
         fetch();
     }
     void fetch()
     {
         if (!m_window) {
             return;
         }
         m_hints = nullptr;
         m_prop = Property(0, m_window, m_atom, m_atom, 0, 5);
     }
     void read()
     {
         m_hints = m_prop.value<MwmHints *>(32, m_atom, nullptr);
     }
     bool hasDecoration() const
     {
         if (!m_window || !m_hints) {
             return false;
         }
         return m_hints->flags & uint32_t(Hints::Decorations);
     }
     bool noBorder() const
     {
         if (!hasDecoration()) {
             return false;
         }
         return !m_hints->decorations;
     }
     bool resize() const
     {
         return testFunction(Functions::Resize);
     }
     bool move() const
     {
         return testFunction(Functions::Move);
     }
     bool minimize() const
     {
         return testFunction(Functions::Minimize);
     }
     bool maximize() const
     {
         return testFunction(Functions::Maximize);
     }
     bool close() const
     {
         return testFunction(Functions::Close);
     }
 
 private:
     struct MwmHints
     {
         uint32_t flags;
         uint32_t functions;
         uint32_t decorations;
         int32_t input_mode;
         uint32_t status;
     };
     enum class Hints {
         Functions = (1L << 0),
         Decorations = (1L << 1)
     };
     enum class Functions {
         All = (1L << 0),
         Resize = (1L << 1),
         Move = (1L << 2),
         Minimize = (1L << 3),
         Maximize = (1L << 4),
         Close = (1L << 5)
     };
     bool testFunction(Functions flag) const
     {
         if (!m_window || !m_hints) {
             return true;
         }
         if (!(m_hints->flags & uint32_t(Hints::Functions))) {
             return true;
         }
         // if MWM_FUNC_ALL is set, other flags say what to turn _off_
         const bool set_value = ((m_hints->functions & uint32_t(Functions::All)) == 0);
         if (m_hints->functions & uint32_t(flag)) {
             return set_value;
         }
         return !set_value;
     }
     xcb_window_t m_window = XCB_WINDOW_NONE;
     Property m_prop;
     xcb_atom_t m_atom;
     MwmHints *m_hints = nullptr;
 };
 
 namespace RandR
 {
 XCB_WRAPPER(ScreenInfo, xcb_randr_get_screen_info, xcb_window_t)
 
 XCB_WRAPPER_DATA(ScreenResourcesData, xcb_randr_get_screen_resources, xcb_window_t)
 class ScreenResources : public Wrapper<ScreenResourcesData, xcb_window_t>
 {
 public:
     explicit ScreenResources(WindowId window)
         : Wrapper<ScreenResourcesData, xcb_window_t>(window)
     {
     }
 
     inline xcb_randr_crtc_t *crtcs()
     {
         if (isNull()) {
             return nullptr;
         }
         return xcb_randr_get_screen_resources_crtcs(data());
     }
     inline xcb_randr_mode_info_t *modes()
     {
         if (isNull()) {
             return nullptr;
         }
         return xcb_randr_get_screen_resources_modes(data());
     }
     inline uint8_t *names()
     {
         if (isNull()) {
             return nullptr;
         }
         return xcb_randr_get_screen_resources_names(data());
     }
 };
 
 XCB_WRAPPER_DATA(CrtcGammaData, xcb_randr_get_crtc_gamma, xcb_randr_crtc_t)
 class CrtcGamma : public Wrapper<CrtcGammaData, xcb_randr_crtc_t>
 {
 public:
     explicit CrtcGamma(xcb_randr_crtc_t c)
         : Wrapper<CrtcGammaData, xcb_randr_crtc_t>(c)
     {
     }
 
     inline uint16_t *red()
     {
         return xcb_randr_get_crtc_gamma_red(data());
     }
     inline uint16_t *green()
     {
         return xcb_randr_get_crtc_gamma_green(data());
     }
     inline uint16_t *blue()
     {
         return xcb_randr_get_crtc_gamma_blue(data());
     }
 };
 
 XCB_WRAPPER_DATA(CrtcInfoData, xcb_randr_get_crtc_info, xcb_randr_crtc_t, xcb_timestamp_t)
 class CrtcInfo : public Wrapper<CrtcInfoData, xcb_randr_crtc_t, xcb_timestamp_t>
 {
 public:
     CrtcInfo() = default;
     CrtcInfo(const CrtcInfo &) = default;
     explicit CrtcInfo(xcb_randr_crtc_t c, xcb_timestamp_t t)
         : Wrapper<CrtcInfoData, xcb_randr_crtc_t, xcb_timestamp_t>(c, t)
     {
     }
 
     inline QRect rect()
     {
         const CrtcInfoData::reply_type *info = data();
         if (!info || info->num_outputs == 0 || info->mode == XCB_NONE || info->status != XCB_RANDR_SET_CONFIG_SUCCESS) {
             return QRect();
         }
         return QRect(info->x, info->y, info->width, info->height);
     }
     inline xcb_randr_output_t *outputs()
     {
         const CrtcInfoData::reply_type *info = data();
         if (!info || info->num_outputs == 0 || info->mode == XCB_NONE || info->status != XCB_RANDR_SET_CONFIG_SUCCESS) {
             return nullptr;
         }
         return xcb_randr_get_crtc_info_outputs(info);
     }
 };
 
 XCB_WRAPPER_DATA(OutputInfoData, xcb_randr_get_output_info, xcb_randr_output_t, xcb_timestamp_t)
 class OutputInfo : public Wrapper<OutputInfoData, xcb_randr_output_t, xcb_timestamp_t>
 {
 public:
     OutputInfo() = default;
     OutputInfo(const OutputInfo &) = default;
     explicit OutputInfo(xcb_randr_output_t c, xcb_timestamp_t t)
         : Wrapper<OutputInfoData, xcb_randr_output_t, xcb_timestamp_t>(c, t)
     {
     }
 
     inline QString name()
     {
         const OutputInfoData::reply_type *info = data();
         if (!info || info->num_crtcs == 0 || info->num_modes == 0 || info->status != XCB_RANDR_SET_CONFIG_SUCCESS) {
             return QString();
         }
         return QString::fromUtf8(reinterpret_cast<char *>(xcb_randr_get_output_info_name(info)), info->name_len);
     }
 };
 
 XCB_WRAPPER_DATA(CurrentResourcesData, xcb_randr_get_screen_resources_current, xcb_window_t)
 class CurrentResources : public Wrapper<CurrentResourcesData, xcb_window_t>
 {
 public:
     explicit CurrentResources(WindowId window)
         : Wrapper<CurrentResourcesData, xcb_window_t>(window)
     {
     }
 
     inline xcb_randr_crtc_t *crtcs()
     {
         if (isNull()) {
             return nullptr;
         }
         return xcb_randr_get_screen_resources_current_crtcs(data());
     }
     inline xcb_randr_mode_info_t *modes()
     {
         if (isNull()) {
             return nullptr;
         }
         return xcb_randr_get_screen_resources_current_modes(data());
     }
 };
 
 XCB_WRAPPER(SetCrtcConfig, xcb_randr_set_crtc_config, xcb_randr_crtc_t, xcb_timestamp_t, xcb_timestamp_t, int16_t, int16_t, xcb_randr_mode_t, uint16_t, uint32_t, const xcb_randr_output_t *)
 
 XCB_WRAPPER_DATA(OutputPropertyData, xcb_randr_get_output_property, xcb_randr_output_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t, uint8_t, uint8_t)
 /**
  * Get an output property.
  * @see Property for documentation of member functions
  */
 class OutputProperty : public Wrapper<OutputPropertyData, xcb_randr_output_t, xcb_atom_t, xcb_atom_t, uint32_t, uint32_t, uint8_t, uint8_t>
 {
 public:
     OutputProperty() = default;
     explicit OutputProperty(xcb_randr_output_t output, xcb_atom_t property, xcb_atom_t type, uint32_t offset, uint32_t length, uint8_t _delete, uint8_t pending)
         : Wrapper(output, property, type, offset, length, _delete, pending)
         , m_type(type)
     {
     }
     template<typename T>
     inline typename std::enable_if<!std::is_pointer<T>::value, T>::type value(T defaultValue = T(), bool *ok = nullptr)
     {
         T *reply = value<T *>(sizeof(T) * 8, m_type, nullptr, ok);
         if (!reply) {
             return defaultValue;
         }
         return reply[0];
     }
     template<typename T>
     inline typename std::enable_if<std::is_pointer<T>::value, T>::type value(T defaultValue = nullptr, bool *ok = nullptr)
     {
         return value<T>(sizeof(typename std::remove_pointer<T>::type) * 8, m_type, defaultValue, ok);
     }
     template<typename T>
     inline typename std::enable_if<std::is_pointer<T>::value, T>::type value(uint8_t format, xcb_atom_t type, T defaultValue = nullptr, bool *ok = nullptr)
     {
         if (ok) {
             *ok = false;
         }
         const OutputPropertyData::reply_type *reply = data();
         if (!reply) {
             return defaultValue;
         }
         if (reply->type != type) {
             return defaultValue;
         }
         if (reply->format != format) {
             return defaultValue;
         }
 
         if (ok) {
             *ok = true;
         }
         if (xcb_randr_get_output_property_data_length(reply) == 0) {
             return defaultValue;
         }
 
         return reinterpret_cast<T>(xcb_randr_get_output_property_data(reply));
     }
     inline QByteArray toByteArray(uint8_t format = 8, xcb_atom_t type = XCB_ATOM_STRING, bool *ok = nullptr)
     {
         bool valueOk = false;
         const char *reply = value<const char *>(format, type, nullptr, &valueOk);
         if (ok) {
             *ok = valueOk;
         }
 
         if (valueOk && !reply) {
             return QByteArray("", 0); // valid, not null, but empty data
         } else if (!valueOk) {
             return QByteArray(); // Property not found, data empty and null
         }
         return QByteArray(reply, xcb_randr_get_output_property_data_length(data()));
     }
     inline QByteArray toByteArray(bool *ok)
     {
         return toByteArray(8, m_type, ok);
     }
     inline bool toBool(uint8_t format = 32, xcb_atom_t type = XCB_ATOM_CARDINAL, bool *ok = nullptr)
     {
         bool *reply = value<bool *>(format, type, nullptr, ok);
         if (!reply) {
             return false;
         }
         if (data()->length != 1) {
             if (ok) {
                 *ok = false;
             }
             return false;
         }
         return reply[0] != 0;
     }
     inline bool toBool(bool *ok)
     {
         return toBool(32, m_type, ok);
     }
 
 private:
     xcb_atom_t m_type;
 };
 }
 
 class ExtensionData
 {
 public:
     ExtensionData();
     int version;
     int eventBase;
     int errorBase;
     int majorOpcode;
     bool present;
     QByteArray name;
     QVector<QByteArray> opCodes;
     QVector<QByteArray> errorCodes;
 };
 
 class KWIN_EXPORT Extensions
 {
 public:
     bool isShapeAvailable() const
     {
         return m_shape.version > 0;
     }
     bool isShapeInputAvailable() const;
     int shapeNotifyEvent() const;
     bool hasShape(xcb_window_t w) const;
     bool isRandrAvailable() const
     {
         return m_randr.present;
     }
     int randrNotifyEvent() const;
     bool isDamageAvailable() const
     {
         return m_damage.present;
     }
     int damageNotifyEvent() const;
     bool isCompositeAvailable() const
     {
         return m_composite.version > 0;
     }
     bool isCompositeOverlayAvailable() const;
     bool isRenderAvailable() const
     {
         return m_render.version > 0;
     }
     bool isFixesAvailable() const
     {
         return m_fixes.version > 0;
     }
     int fixesCursorNotifyEvent() const;
     int fixesSelectionNotifyEvent() const;
     bool isFixesRegionAvailable() const;
     bool isSyncAvailable() const
     {
         return m_sync.present;
     }
     int syncAlarmNotifyEvent() const;
     QVector<ExtensionData> extensions() const;
     bool hasGlx() const
     {
         return m_glx.present;
     }
     int glxEventBase() const
     {
         return m_glx.eventBase;
     }
     int glxMajorOpcode() const
     {
         return m_glx.majorOpcode;
     }
 
     static Extensions *self();
     static void destroy();
 
 private:
     Extensions();
     ~Extensions();
     void init();
     template<typename reply, typename T, typename F>
     void initVersion(T cookie, F f, ExtensionData *dataToFill);
     void extensionQueryReply(const xcb_query_extension_reply_t *extension, ExtensionData *dataToFill);
 
     ExtensionData m_shape;
     ExtensionData m_randr;
     ExtensionData m_damage;
     ExtensionData m_composite;
     ExtensionData m_render;
     ExtensionData m_fixes;
     ExtensionData m_sync;
     ExtensionData m_glx;
 
     static Extensions *s_self;
 };
 
 /**
  * This class is an RAII wrapper for an xcb_window_t. An xcb_window_t hold by an instance of this class
  * will be freed when the instance gets destroyed.
  *
  * Furthermore the class provides wrappers around some xcb methods operating on an xcb_window_t.
  *
  * For the cases that one is more interested in wrapping the xcb methods the constructor which takes
  * an existing window and the @ref reset method allow to disable the RAII functionality.
  */
 class Window
 {
 public:
     /**
      * Takes over responsibility of @p window. If @p window is not provided an invalid Window is
      * created. Use @ref create to set an xcb_window_t later on.
      *
      * If @p destroy is @c true the window will be destroyed together with this object, if @c false
      * the window will be kept around. This is useful if you are not interested in the RAII capabilities
      * but still want to use a window like an object.
      *
      * @param window The window to manage.
      * @param destroy Whether the window should be destroyed together with the object.
      * @see reset
      */
     Window(xcb_window_t window = XCB_WINDOW_NONE, bool destroy = true);
     /**
      * Creates an xcb_window_t and manages it. It's a convenient method to create a window with
      * depth, class and visual being copied from parent and border being @c 0.
      * @param geometry The geometry for the window to be created
      * @param mask The mask for the values
      * @param values The values to be passed to xcb_create_window
      * @param parent The parent window
      */
     Window(const QRectF &geometry, uint32_t mask = 0, const uint32_t *values = nullptr, xcb_window_t parent = rootWindow());
     /**
      * Creates an xcb_window_t and manages it. It's a convenient method to create a window with
      * depth and visual being copied from parent and border being @c 0.
      * @param geometry The geometry for the window to be created
      * @param windowClass The window class
      * @param mask The mask for the values
      * @param values The values to be passed to xcb_create_window
      * @param parent The parent window
      */
     Window(const QRectF &geometry, uint16_t windowClass, uint32_t mask = 0, const uint32_t *values = nullptr, xcb_window_t parent = rootWindow());
     Window(const Window &other) = delete;
     ~Window();
 
     /**
      * Creates a new window for which the responsibility is taken over. If a window had been managed
      * before it is freed.
      *
      * Depth, class and visual are being copied from parent and border is @c 0.
      * @param geometry The geometry for the window to be created
      * @param mask The mask for the values
      * @param values The values to be passed to xcb_create_window
      * @param parent The parent window
      */
     void create(const QRectF &geometry, uint32_t mask = 0, const uint32_t *values = nullptr, xcb_window_t parent = rootWindow());
     /**
      * Creates a new window for which the responsibility is taken over. If a window had been managed
      * before it is freed.
      *
      * Depth and visual are being copied from parent and border is @c 0.
      * @param geometry The geometry for the window to be created
      * @param windowClass The window class
      * @param mask The mask for the values
      * @param values The values to be passed to xcb_create_window
      * @param parent The parent window
      */
     void create(const QRectF &geometry, uint16_t windowClass, uint32_t mask = 0, const uint32_t *values = nullptr, xcb_window_t parent = rootWindow());
     /**
      * Frees the existing window and starts to manage the new @p window.
      * If @p destroy is @c true the new managed window will be destroyed together with this
      * object or when reset is called again. If @p destroy is @c false the window will not
      * be destroyed. It is then the responsibility of the caller to destroy the window.
      */
     void reset(xcb_window_t window = XCB_WINDOW_NONE, bool destroy = true);
     /**
      * @returns @c true if a window is managed, @c false otherwise.
      */
     bool isValid() const;
     inline const QRectF &geometry() const
     {
         return m_logicGeometry;
     }
     /**
      * Configures the window with a new geometry.
      * @param geometry The new window geometry to be used
      */
     void setGeometry(const QRectF &geometry);
     void setGeometry(qreal x, qreal y, qreal width, qreal height);
     void move(const QPointF &pos);
     void move(qreal x, qreal y);
     void resize(const QSizeF &size);
     void resize(qreal width, qreal height);
     void raise();
     void lower();
     void map();
     void unmap();
     void reparent(xcb_window_t parent, qreal x = 0, qreal y = 0);
     void changeProperty(xcb_atom_t property, xcb_atom_t type, uint8_t format, uint32_t length,
                         const void *data, uint8_t mode = XCB_PROP_MODE_REPLACE);
     void deleteProperty(xcb_atom_t property);
     void setBorderWidth(uint32_t width);
     void grabButton(uint8_t pointerMode, uint8_t keyboardmode,
                     uint16_t modifiers = XCB_MOD_MASK_ANY,
                     uint8_t button = XCB_BUTTON_INDEX_ANY,
                     uint16_t eventMask = XCB_EVENT_MASK_BUTTON_PRESS,
                     xcb_window_t confineTo = XCB_WINDOW_NONE,
                     xcb_cursor_t cursor = XCB_CURSOR_NONE,
                     bool ownerEvents = false);
     void ungrabButton(uint16_t modifiers = XCB_MOD_MASK_ANY, uint8_t button = XCB_BUTTON_INDEX_ANY);
     /**
      * Clears the window area. Same as xcb_clear_area with x, y, width, height being @c 0.
      */
     void clear();
     void setBackgroundPixmap(xcb_pixmap_t pixmap);
     void defineCursor(xcb_cursor_t cursor);
     void focus(uint8_t revertTo = XCB_INPUT_FOCUS_POINTER_ROOT, xcb_timestamp_t time = XCB_TIME_CURRENT_TIME);
     void selectInput(uint32_t events);
     void kill();
     operator xcb_window_t() const;
 
 private:
     xcb_window_t doCreate(const QRectF &geometry, uint16_t windowClass, uint32_t mask = 0, const uint32_t *values = nullptr, xcb_window_t parent = rootWindow());
     void destroy();
     xcb_window_t m_window;
     bool m_destroy;
     QRectF m_logicGeometry;
 };
 
 inline Window::Window(xcb_window_t window, bool destroy)
     : m_window(window)
     , m_destroy(destroy)
 {
 }
 
 inline Window::Window(const QRectF &geometry, uint32_t mask, const uint32_t *values, xcb_window_t parent)
     : m_window(doCreate(geometry, XCB_COPY_FROM_PARENT, mask, values, parent))
     , m_destroy(true)
 {
 }
 
 inline Window::Window(const QRectF &geometry, uint16_t windowClass, uint32_t mask, const uint32_t *values, xcb_window_t parent)
     : m_window(doCreate(geometry, windowClass, mask, values, parent))
     , m_destroy(true)
 {
 }
 
 inline Window::~Window()
 {
     destroy();
 }
 
 inline void Window::destroy()
 {
     if (!isValid() || !m_destroy) {
         return;
     }
     xcb_destroy_window(connection(), m_window);
     m_window = XCB_WINDOW_NONE;
 }
 
 inline bool Window::isValid() const
 {
     return m_window != XCB_WINDOW_NONE;
 }
 
 inline Window::operator xcb_window_t() const
 {
     return m_window;
 }
 
 inline void Window::create(const QRectF &geometry, uint16_t windowClass, uint32_t mask, const uint32_t *values, xcb_window_t parent)
 {
     destroy();
     m_window = doCreate(geometry, windowClass, mask, values, parent);
 }
 
 inline void Window::create(const QRectF &geometry, uint32_t mask, const uint32_t *values, xcb_window_t parent)
 {
     create(geometry, XCB_COPY_FROM_PARENT, mask, values, parent);
 }
 
 inline xcb_window_t Window::doCreate(const QRectF &geometry, uint16_t windowClass, uint32_t mask, const uint32_t *values, xcb_window_t parent)
 {
     m_logicGeometry = geometry;
     xcb_window_t w = xcb_generate_id(connection());
     xcb_create_window(connection(), XCB_COPY_FROM_PARENT, w, parent,
                       Xcb::toXNative(geometry.x()), Xcb::toXNative(geometry.y()), Xcb::toXNative(geometry.width()), Xcb::toXNative(geometry.height()),
                       0, windowClass, XCB_COPY_FROM_PARENT, mask, values);
     return w;
 }
 
 inline void Window::reset(xcb_window_t window, bool shouldDestroy)
 {
     destroy();
     m_window = window;
     m_destroy = shouldDestroy;
 }
 
 inline void Window::setGeometry(const QRectF &geometry)
 {
     setGeometry(geometry.x(), geometry.y(), geometry.width(), geometry.height());
 }
 
 inline void Window::setGeometry(qreal x, qreal y, qreal width, qreal height)
 {
     m_logicGeometry.setRect(x, y, width, height);
     if (!isValid()) {
         return;
     }
     const uint16_t mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
     const uint32_t values[] = {Xcb::toXNative(x), Xcb::toXNative(y), Xcb::toXNative(width), Xcb::toXNative(height)};
     xcb_configure_window(connection(), m_window, mask, values);
 }
 
 inline void Window::move(const QPointF &pos)
 {
     move(pos.x(), pos.y());
 }
 
 inline void Window::move(qreal x, qreal y)
 {
     m_logicGeometry.moveTo(x, y);
     if (!isValid()) {
         return;
     }
     moveWindow(m_window, x, y);
 }
 
 inline void Window::resize(const QSizeF &size)
 {
     resize(size.width(), size.height());
 }
 
 inline void Window::resize(qreal width, qreal height)
 {
     m_logicGeometry.setSize(QSizeF(width, height));
     if (!isValid()) {
         return;
     }
     const uint16_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
     const uint32_t values[] = {Xcb::toXNative(width), Xcb::toXNative(height)};
     xcb_configure_window(connection(), m_window, mask, values);
 }
 
 inline void Window::raise()
 {
     const uint32_t values[] = {XCB_STACK_MODE_ABOVE};
     xcb_configure_window(connection(), m_window, XCB_CONFIG_WINDOW_STACK_MODE, values);
 }
 
 inline void Window::lower()
 {
     lowerWindow(m_window);
 }
 
 inline void Window::map()
 {
     if (!isValid()) {
         return;
     }
     xcb_map_window(connection(), m_window);
 }
 
 inline void Window::unmap()
 {
     if (!isValid()) {
         return;
     }
     xcb_unmap_window(connection(), m_window);
 }
 
 inline void Window::reparent(xcb_window_t parent, qreal x, qreal y)
 {
     if (!isValid()) {
         return;
     }
     xcb_reparent_window(connection(), m_window, parent, Xcb::toXNative(x), Xcb::toXNative(y));
 }
 
 inline void Window::changeProperty(xcb_atom_t property, xcb_atom_t type, uint8_t format, uint32_t length, const void *data, uint8_t mode)
 {
     if (!isValid()) {
         return;
     }
     xcb_change_property(connection(), mode, m_window, property, type, format, length, data);
 }
 
 inline void Window::deleteProperty(xcb_atom_t property)
 {
     if (!isValid()) {
         return;
     }
     xcb_delete_property(connection(), m_window, property);
 }
 
 inline void Window::setBorderWidth(uint32_t width)
 {
     if (!isValid()) {
         return;
     }
     uint32_t _width = Xcb::toXNative(width);
     xcb_configure_window(connection(), m_window, XCB_CONFIG_WINDOW_BORDER_WIDTH, &_width);
 }
 
 inline void Window::grabButton(uint8_t pointerMode, uint8_t keyboardmode, uint16_t modifiers,
                                uint8_t button, uint16_t eventMask, xcb_window_t confineTo,
                                xcb_cursor_t cursor, bool ownerEvents)
 {
     if (!isValid()) {
         return;
     }
     xcb_grab_button(connection(), ownerEvents, m_window, eventMask,
                     pointerMode, keyboardmode, confineTo, cursor, button, modifiers);
 }
 
 inline void Window::ungrabButton(uint16_t modifiers, uint8_t button)
 {
     if (!isValid()) {
         return;
     }
     xcb_ungrab_button(connection(), button, m_window, modifiers);
 }
 
 inline void Window::clear()
 {
     if (!isValid()) {
         return;
     }
     xcb_clear_area(connection(), false, m_window, 0, 0, 0, 0);
 }
 
 inline void Window::setBackgroundPixmap(xcb_pixmap_t pixmap)
 {
     if (!isValid()) {
         return;
     }
     const uint32_t values[] = {pixmap};
     xcb_change_window_attributes(connection(), m_window, XCB_CW_BACK_PIXMAP, values);
 }
 
 inline void Window::defineCursor(xcb_cursor_t cursor)
 {
     Xcb::defineCursor(m_window, cursor);
 }
 
 inline void Window::focus(uint8_t revertTo, xcb_timestamp_t time)
 {
     setInputFocus(m_window, revertTo, time);
 }
 
 inline void Window::selectInput(uint32_t events)
 {
     Xcb::selectInput(m_window, events);
 }
 
 inline void Window::kill()
 {
     xcb_kill_client(connection(), m_window);
 }
 
 // helper functions
 static inline void moveResizeWindow(WindowId window, const QRect &geometry)
 {
     const uint16_t mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 
     const uint32_t values[] = {Xcb::toXNative(geometry.x()), Xcb::toXNative(geometry.y()), Xcb::toXNative(geometry.width()), Xcb::toXNative(geometry.height())};
     xcb_configure_window(connection(), window, mask, values);
 }
 
 static inline void moveWindow(xcb_window_t window, const QPoint &pos)
 {
     moveWindow(window, pos.x(), pos.y());
 }
 
 static inline void moveWindow(xcb_window_t window, uint32_t x, uint32_t y)
 {
     const uint16_t mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y;
     const uint32_t values[] = {Xcb::toXNative(x), Xcb::toXNative(y)};
     xcb_configure_window(connection(), window, mask, values);
 }
 
 static inline void lowerWindow(xcb_window_t window)
 {
     const uint32_t values[] = {XCB_STACK_MODE_BELOW};
     xcb_configure_window(connection(), window, XCB_CONFIG_WINDOW_STACK_MODE, values);
 }
 
 static inline WindowId createInputWindow(const QRect &geometry, uint32_t mask, const uint32_t *values)
 {
     WindowId window = xcb_generate_id(connection());
     xcb_create_window(connection(), 0, window, rootWindow(),
                       geometry.x(), geometry.y(), geometry.width(), geometry.height(),
                       0, XCB_WINDOW_CLASS_INPUT_ONLY,
                       XCB_COPY_FROM_PARENT, mask, values);
     return window;
 }
 
 static inline void restackWindows(const QVector<xcb_window_t> &windows)
 {
     if (windows.count() < 2) {
         // only one window, nothing to do
         return;
     }
     for (int i = 1; i < windows.count(); ++i) {
         const uint16_t mask = XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE;
         const uint32_t stackingValues[] = {
             windows.at(i - 1),
             XCB_STACK_MODE_BELOW};
         xcb_configure_window(connection(), windows.at(i), mask, stackingValues);
     }
 }
 
 static inline void restackWindowsWithRaise(const QVector<xcb_window_t> &windows)
 {
     if (windows.isEmpty()) {
         return;
     }
     const uint32_t values[] = {XCB_STACK_MODE_ABOVE};
     xcb_configure_window(connection(), windows.first(), XCB_CONFIG_WINDOW_STACK_MODE, values);
     restackWindows(windows);
 }
 
 static xcb_screen_t *defaultScreen()
 {
     return xcb_setup_roots_iterator(xcb_get_setup(connection())).data;
 }
 
 static inline int defaultDepth()
 {
     return defaultScreen()->root_depth;
 }
 
 static inline xcb_rectangle_t fromQt(const QRect &rect)
 {
     const QRect nativeRect = toXNative(rect);
     xcb_rectangle_t rectangle;
     rectangle.x = nativeRect.x();
     rectangle.y = nativeRect.y();
     rectangle.width = nativeRect.width();
     rectangle.height = nativeRect.height();
     return rectangle;
 }
 
 static inline QVector<xcb_rectangle_t> regionToRects(const QRegion &region)
 {
     QVector<xcb_rectangle_t> rects;
     rects.reserve(region.rectCount());
     for (const QRect &rect : region) {
         rects.append(Xcb::fromQt(rect));
     }
     return rects;
 }
 
 static inline void defineCursor(xcb_window_t window, xcb_cursor_t cursor)
 {
     xcb_change_window_attributes(connection(), window, XCB_CW_CURSOR, &cursor);
 }
 
 static inline void setInputFocus(xcb_window_t window, uint8_t revertTo, xcb_timestamp_t time)
 {
     xcb_set_input_focus(connection(), revertTo, window, time);
 }
 
 static inline void setTransientFor(xcb_window_t window, xcb_window_t transient_for_window)
 {
     xcb_change_property(connection(), XCB_PROP_MODE_REPLACE, window, XCB_ATOM_WM_TRANSIENT_FOR,
                         XCB_ATOM_WINDOW, 32, 1, &transient_for_window);
 }
 
 static inline void sync()
 {
     auto *c = connection();
     const auto cookie = xcb_get_input_focus(c);
     xcb_generic_error_t *error = nullptr;
     UniqueCPtr<xcb_get_input_focus_reply_t> sync(xcb_get_input_focus_reply(c, cookie, &error));
     if (error) {
         free(error);
     }
 }
 
 void selectInput(xcb_window_t window, uint32_t events)
 {
     xcb_change_window_attributes(connection(), window, XCB_CW_EVENT_MASK, &events);
 }
 
 /**
  * @brief Small helper class to encapsulate SHM related functionality.
  */
 class Shm
 {
 public:
     Shm();
     ~Shm();
     int shmId() const;
     void *buffer() const;
     xcb_shm_seg_t segment() const;
     bool isValid() const;
     uint8_t pixmapFormat() const;
 
 private:
     bool init();
     int m_shmId;
     void *m_buffer;
     xcb_shm_seg_t m_segment;
     bool m_valid;
     uint8_t m_pixmapFormat;
 };
 
 inline void *Shm::buffer() const
 {
     return m_buffer;
 }
 
 inline bool Shm::isValid() const
 {
     return m_valid;
 }
 
 inline xcb_shm_seg_t Shm::segment() const
 {
     return m_segment;
 }
 
 inline int Shm::shmId() const
 {
     return m_shmId;
 }
 
 inline uint8_t Shm::pixmapFormat() const
 {
     return m_pixmapFormat;
 }
 
 } // namespace X11
 
 } // namespace KWin