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kwin/x11windowed_backend.cpp
Martin Gräßlin ee186a68c4 [wayland] Improve decision which backend to create 
Both Wayland and X11 backend are bound to the --windowed flag. Which
one to create is decided whether DISPLAY or WAYLAND_DISPLAY env variables
are set with Wayland having precedence over X11. Passing the display as
command line argument overwrites the env variable and takes further
precedence. E.g. if WAYLAND_DISPLAY is exported and --x11-display
argument is provided, it will create X11 backend. Similarly there is now
a --wayland-display command line argument.

If no backend got created, kwin_wayland will exit.

The singleton variant of WaylandBackend is adjusted to take the display
as argument and pass it to the Connection.
2015-03-23 12:45:21 +01:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2015 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 "x11windowed_backend.h"
#include "composite.h"
#include "input.h"
#include "utils.h"
#include "wayland_server.h"
#include "xcbutils.h"
#include <kwinxrenderutils.h>
#include <QAbstractEventDispatcher>
#include <QCoreApplication>
#include <QDebug>
#include <QSocketNotifier>
// kwayland
#include <KWayland/Server/buffer_interface.h>
#include <KWayland/Server/seat_interface.h>
#include <KWayland/Server/surface_interface.h>
// system
#include <linux/input.h>
#if HAVE_X11_XCB
#include <X11/Xlib-xcb.h>
#endif
namespace KWin
{
X11WindowedBackend *X11WindowedBackend::s_self = nullptr;
X11WindowedBackend *X11WindowedBackend::create(const QByteArray &display, const QSize &size, QObject *parent)
{
Q_ASSERT(!s_self);
s_self = new X11WindowedBackend(display, size, parent);
return s_self;
}
X11WindowedBackend::X11WindowedBackend(const QByteArray &display, const QSize &size, QObject *parent)
: AbstractBackend(parent)
, m_size(size)
{
int screen = 0;
xcb_connection_t *c = nullptr;
#if HAVE_X11_XCB
Display *xDisplay = XOpenDisplay(display.constData());
if (xDisplay) {
c = XGetXCBConnection(xDisplay);
XSetEventQueueOwner(xDisplay, XCBOwnsEventQueue);
screen = XDefaultScreen(xDisplay);
}
#else
c = xcb_connect(display.constData(), &screen);
#endif
if (c && !xcb_connection_has_error(c)) {
m_connection = c;
m_screenNumber = screen;
#if HAVE_X11_XCB
m_display = xDisplay;
#endif
for (xcb_screen_iterator_t it = xcb_setup_roots_iterator(xcb_get_setup(m_connection));
it.rem;
--screen, xcb_screen_next(&it)) {
if (screen == m_screenNumber) {
m_screen = it.data;
}
}
XRenderUtils::init(m_connection, m_screen->root);
createWindow();
startEventReading();
}
}
X11WindowedBackend::~X11WindowedBackend()
{
if (m_connection) {
if (m_window) {
xcb_unmap_window(m_connection, m_window);
xcb_destroy_window(m_connection, m_window);
}
if (m_cursor) {
xcb_free_cursor(m_connection, m_cursor);
}
xcb_disconnect(m_connection);
}
s_self = nullptr;
}
void X11WindowedBackend::createWindow()
{
Q_ASSERT(m_window == XCB_WINDOW_NONE);
Xcb::Atom protocolsAtom(QByteArrayLiteral("WM_PROTOCOLS"), false, m_connection);
Xcb::Atom deleteWindowAtom(QByteArrayLiteral("WM_DELETE_WINDOW"), false, m_connection);
m_window = xcb_generate_id(m_connection);
uint32_t mask = XCB_CW_EVENT_MASK;
const uint32_t values[] = {
XCB_EVENT_MASK_KEY_PRESS |
XCB_EVENT_MASK_KEY_RELEASE |
XCB_EVENT_MASK_BUTTON_PRESS |
XCB_EVENT_MASK_BUTTON_RELEASE |
XCB_EVENT_MASK_POINTER_MOTION |
XCB_EVENT_MASK_ENTER_WINDOW |
XCB_EVENT_MASK_LEAVE_WINDOW |
XCB_EVENT_MASK_STRUCTURE_NOTIFY |
XCB_EVENT_MASK_EXPOSURE
};
xcb_create_window(m_connection, XCB_COPY_FROM_PARENT, m_window, m_screen->root,
0, 0, m_size.width(), m_size.height(),
0, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT, mask, values);
xcb_map_window(m_connection, m_window);
m_protocols = protocolsAtom;
m_deleteWindowProtocol = deleteWindowAtom;
xcb_change_property(m_connection, XCB_PROP_MODE_REPLACE, m_window, m_protocols, XCB_ATOM_ATOM, 32, 1, &m_deleteWindowProtocol);
xcb_flush(m_connection);
}
void X11WindowedBackend::startEventReading()
{
QSocketNotifier *notifier = new QSocketNotifier(xcb_get_file_descriptor(m_connection), QSocketNotifier::Read, this);
auto processXcbEvents = [this] {
while (auto event = xcb_poll_for_event(m_connection)) {
handleEvent(event);
free(event);
}
xcb_flush(m_connection);
};
connect(notifier, &QSocketNotifier::activated, this, processXcbEvents);
connect(QCoreApplication::eventDispatcher(), &QAbstractEventDispatcher::aboutToBlock, this, processXcbEvents);
connect(QCoreApplication::eventDispatcher(), &QAbstractEventDispatcher::awake, this, processXcbEvents);
}
void X11WindowedBackend::handleEvent(xcb_generic_event_t *e)
{
const uint8_t eventType = e->response_type & ~0x80;
switch (eventType) {
case XCB_BUTTON_PRESS:
case XCB_BUTTON_RELEASE:
handleButtonPress(reinterpret_cast<xcb_button_press_event_t*>(e));
break;
case XCB_MOTION_NOTIFY:
if (input()) {
auto event = reinterpret_cast<xcb_motion_notify_event_t*>(e);
input()->processPointerMotion(QPointF(event->event_x, event->event_y), event->time);
}
break;
case XCB_KEY_PRESS:
case XCB_KEY_RELEASE:
if (input()) {
auto event = reinterpret_cast<xcb_key_press_event_t*>(e);
input()->processKeyboardKey(event->detail - 8, eventType == XCB_KEY_PRESS ? InputRedirection::KeyboardKeyPressed : InputRedirection::KeyboardKeyReleased, event->time);
}
break;
case XCB_CONFIGURE_NOTIFY:
updateSize(reinterpret_cast<xcb_configure_notify_event_t*>(e));
break;
case XCB_ENTER_NOTIFY:
if (input()) {
auto event = reinterpret_cast<xcb_enter_notify_event_t*>(e);
input()->processPointerMotion(QPointF(event->event_x, event->event_y), event->time);
}
break;
case XCB_CLIENT_MESSAGE:
handleClientMessage(reinterpret_cast<xcb_client_message_event_t*>(e));
break;
case XCB_EXPOSE:
handleExpose(reinterpret_cast<xcb_expose_event_t*>(e));
break;
default:
break;
}
}
void X11WindowedBackend::handleClientMessage(xcb_client_message_event_t *event)
{
if (event->window != m_window) {
return;
}
if (event->type == m_protocols && m_protocols != XCB_ATOM_NONE) {
if (event->data.data32[0] == m_deleteWindowProtocol && m_deleteWindowProtocol != XCB_ATOM_NONE) {
qCDebug(KWIN_CORE) << "Backend window is going to be closed, shutting down.";
QCoreApplication::quit();
}
}
}
void X11WindowedBackend::handleButtonPress(xcb_button_press_event_t *event)
{
if (!input()) {
return;
}
bool const pressed = (event->response_type & ~0x80) == XCB_BUTTON_PRESS;
if (event->detail >= XCB_BUTTON_INDEX_4 && event->detail <= 7) {
// wheel
if (!pressed) {
return;
}
const int delta = (event->detail == XCB_BUTTON_INDEX_4 || event->detail == 6) ? -1 : 1;
InputRedirection::PointerAxis axis = (event->detail > 5) ? InputRedirection::PointerAxisHorizontal : InputRedirection::PointerAxisVertical;
static const qreal s_defaultAxisStepDistance = 10.0;
input()->processPointerAxis(axis, delta * s_defaultAxisStepDistance, event->time);
return;
}
uint32_t button = 0;
switch (event->detail) {
case XCB_BUTTON_INDEX_1:
button = BTN_LEFT;
break;
case XCB_BUTTON_INDEX_2:
button = BTN_MIDDLE;
break;
case XCB_BUTTON_INDEX_3:
button = BTN_RIGHT;
break;
default:
button = event->detail + BTN_LEFT - 1;
return;
}
input()->processPointerMotion(QPointF(event->event_x, event->event_y), event->time);
input()->processPointerButton(button, pressed ? InputRedirection::PointerButtonPressed : InputRedirection::PointerButtonReleased, event->time);
}
void X11WindowedBackend::handleExpose(xcb_expose_event_t *event)
{
if (!Compositor::self()) {
return;
}
Compositor::self()->addRepaint(QRect(event->x, event->y, event->width, event->height));
}
void X11WindowedBackend::updateSize(xcb_configure_notify_event_t *event)
{
if (event->window != m_window) {
return;
}
QSize s = QSize(event->width, event->height);
if (s != m_size) {
m_size = s;
emit sizeChanged();
}
}
void X11WindowedBackend::installCursorFromServer()
{
if (!waylandServer() || !waylandServer()->seat()->focusedPointer()) {
return;
}
auto c = waylandServer()->seat()->focusedPointer()->cursor();
if (c) {
auto cursorSurface = c->surface();
if (!cursorSurface.isNull()) {
auto buffer = cursorSurface.data()->buffer();
if (buffer) {
// TODO: cache generated cursors?
const xcb_pixmap_t pix = xcb_generate_id(m_connection);
const xcb_gcontext_t gc = xcb_generate_id(m_connection);
const xcb_cursor_t cid = xcb_generate_id(m_connection);
xcb_create_pixmap(m_connection, 32, pix, m_screen->root, buffer->size().width(), buffer->size().height());
xcb_create_gc(m_connection, gc, pix, 0, nullptr);
const QImage img = buffer->data();
xcb_put_image(m_connection, XCB_IMAGE_FORMAT_Z_PIXMAP, pix, gc, img.width(), img.height(), 0, 0, 0, 32, img.byteCount(), img.constBits());
XRenderPicture pic(pix, 32);
xcb_render_create_cursor(m_connection, cid, pic, c->hotspot().x(), c->hotspot().y());
xcb_change_window_attributes(m_connection, m_window, XCB_CW_CURSOR, &cid);
xcb_free_pixmap(m_connection, pix);
xcb_free_gc(m_connection, gc);
if (m_cursor) {
xcb_free_cursor(m_connection, m_cursor);
}
m_cursor = cid;
xcb_flush(m_connection);
return;
}
}
}
// TODO: unset cursor
}
xcb_window_t X11WindowedBackend::rootWindow() const
{
if (!m_screen) {
return XCB_WINDOW_NONE;
}
return m_screen->root;
}
}
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