/* KWin - the KDE window manager This file is part of the KDE project. SPDX-FileCopyrightText: 2018 Martin Flöser <mgraesslin@kde.org> SPDX-License-Identifier: GPL-2.0-or-later */ #pragma once #include <xcb/xcb.h> #include <cstring> namespace KWin { class GeEventMemMover { public: GeEventMemMover(xcb_generic_event_t *event) : m_event(reinterpret_cast<xcb_ge_generic_event_t *>(event)) { // xcb event structs contain stuff that wasn't on the wire, the full_sequence field // adds an extra 4 bytes and generic events cookie data is on the wire right after the standard 32 bytes. // Move this data back to have the same layout in memory as it was on the wire // and allow casting, overwriting the full_sequence field. memmove((char*) m_event + 32, (char*) m_event + 36, m_event->length * 4); } ~GeEventMemMover() { // move memory layout back, so that Qt can do the same without breaking memmove((char*) m_event + 36, (char *) m_event + 32, m_event->length * 4); } xcb_ge_generic_event_t *operator->() const { return m_event; } private: xcb_ge_generic_event_t *m_event; }; }