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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant reason:default
#include "qxcbintegration.h"
#include "qxcbconnection.h"
#include "qxcbscreen.h"
#include "qxcbwindow.h"
#include "qxcbcursor.h"
#include "qxcbkeyboard.h"
#include "qxcbbackingstore.h"
#include "qxcbnativeinterface.h"
#include "qxcbclipboard.h"
#include "qxcbeventqueue.h"
#include "qxcbeventdispatcher.h"
#if QT_CONFIG(draganddrop)
#include "qxcbdrag.h"
#endif
#include "qxcbglintegration.h"
#ifndef QT_NO_SESSIONMANAGER
#include "qxcbsessionmanager.h"
#endif
#include "qxcbxsettings.h"
#include <xcb/xcb.h>
#include <QtGui/private/qgenericunixfontdatabase_p.h>
#include <QtGui/private/qdesktopunixservices_p.h>
#include <stdio.h>
#include <QtGui/private/qguiapplication_p.h>
#if QT_CONFIG(xcb_xlib)
#define register /* C++17 deprecated register */
#include <X11/Xlib.h>
#undef register
#endif
#include <qpa/qplatforminputcontextfactory_p.h>
#include <private/qgenericunixtheme_p.h>
#if QT_CONFIG(dbus)
#include <private/qkdetheme_p.h>
#endif
#include <qpa/qplatforminputcontext.h>
#include <QtGui/QOpenGLContext>
#include <QtGui/QScreen>
#include <QtGui/QOffscreenSurface>
#if QT_CONFIG(accessibility)
#include <qpa/qplatformaccessibility.h>
#if QT_CONFIG(accessibility_atspi_bridge)
#include <QtGui/private/qspiaccessiblebridge_p.h>
#endif
#endif
#include <QtCore/QFileInfo>
#if QT_CONFIG(vulkan)
#include "qxcbvulkaninstance.h"
#include "qxcbvulkanwindow.h"
#endif
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
// Find out if our parent process is gdb by looking at the 'exe' symlink under /proc,.
// or, for older Linuxes, read out 'cmdline'.
static bool runningUnderDebugger()
{
#if defined(Q_OS_LINUX)
const QString parentProc = "/proc/"_L1 + QString::number(getppid());
const QFileInfo parentProcExe(parentProc + "/exe"_L1);
if (parentProcExe.isSymLink())
return parentProcExe.symLinkTarget().endsWith("/gdb"_L1);
QFile f(parentProc + "/cmdline"_L1);
if (!f.open(QIODevice::ReadOnly))
return false;
QByteArray s;
char c;
while (f.getChar(&c) && c) {
if (c == '/')
s.clear();
else
s += c;
}
return s == "gdb";
#else
return false;
#endif
}
class QXcbUnixServices : public QDesktopUnixServices, public QXcbObject
{
public:
QString portalWindowIdentifier(QWindow *window) override;
void registerDBusMenuForWindow(QWindow *window, const QString &service, const QString &path) override;
void unregisterDBusMenuForWindow(QWindow *window) override;
};
QXcbIntegration *QXcbIntegration::m_instance = nullptr;
QXcbIntegration::QXcbIntegration(const QStringList ¶meters, int &argc, char **argv)
: m_services(new QXcbUnixServices)
, m_instanceName(nullptr)
, m_canGrab(true)
, m_defaultVisualId(UINT_MAX)
{
Q_UNUSED(parameters);
m_instance = this;
qApp->setAttribute(Qt::AA_CompressHighFrequencyEvents, true);
qRegisterMetaType<QXcbWindow*>();
#if QT_CONFIG(xcb_xlib)
XInitThreads();
#endif
m_nativeInterface.reset(new QXcbNativeInterface);
// Parse arguments
const char *displayName = nullptr;
bool noGrabArg = false;
bool doGrabArg = false;
if (argc) {
int j = 1;
for (int i = 1; i < argc; i++) {
QByteArray arg(argv[i]);
if (arg.startsWith("--"))
arg.remove(0, 1);
if (arg == "-display" && i < argc - 1)
displayName = argv[++i];
else if (arg == "-name" && i < argc - 1)
m_instanceName = argv[++i];
else if (arg == "-nograb")
noGrabArg = true;
else if (arg == "-dograb")
doGrabArg = true;
else if (arg == "-visual" && i < argc - 1) {
bool ok = false;
m_defaultVisualId = QByteArray(argv[++i]).toUInt(&ok, 0);
if (!ok)
m_defaultVisualId = UINT_MAX;
}
else
argv[j++] = argv[i];
}
argc = j;
} // argc
bool underDebugger = runningUnderDebugger();
if (noGrabArg && doGrabArg && underDebugger) {
qWarning("Both -nograb and -dograb command line arguments specified. Please pick one. -nograb takes precedence");
doGrabArg = false;
}
if (!noGrabArg && !doGrabArg && underDebugger) {
qCDebug(lcQpaXcb, "Qt: gdb: -nograb added to command-line options.\n"
"\t Use the -dograb option to enforce grabbing.");
}
m_canGrab = (!underDebugger && !noGrabArg) || (underDebugger && doGrabArg);
static bool canNotGrabEnv = qEnvironmentVariableIsSet("QT_XCB_NO_GRAB_SERVER");
if (canNotGrabEnv)
m_canGrab = false;
m_connection = new QXcbConnection(m_nativeInterface.data(), m_canGrab, m_defaultVisualId, displayName);
if (!m_connection->isConnected()) {
delete m_connection;
m_connection = nullptr;
return;
}
m_services->setConnection(m_connection);
m_fontDatabase.reset(new QGenericUnixFontDatabase());
}
QXcbIntegration::~QXcbIntegration()
{
delete m_connection;
m_connection = nullptr;
m_instance = nullptr;
}
QPlatformPixmap *QXcbIntegration::createPlatformPixmap(QPlatformPixmap::PixelType type) const
{
return QPlatformIntegration::createPlatformPixmap(type);
}
QPlatformWindow *QXcbIntegration::createPlatformWindow(QWindow *window) const
{
QXcbGlIntegration *glIntegration = nullptr;
const bool isTrayIconWindow = QXcbWindow::isTrayIconWindow(window);
if (!isTrayIconWindow) {
if (window->supportsOpenGL()) {
glIntegration = connection()->glIntegration();
if (glIntegration) {
QXcbWindow *xcbWindow = glIntegration->createWindow(window);
xcbWindow->create();
return xcbWindow;
}
#if QT_CONFIG(vulkan)
} else if (window->surfaceType() == QSurface::VulkanSurface) {
QXcbWindow *xcbWindow = new QXcbVulkanWindow(window);
xcbWindow->create();
return xcbWindow;
#endif
}
}
Q_ASSERT(isTrayIconWindow || !window->supportsOpenGL()
|| (!glIntegration && window->surfaceType() == QSurface::RasterSurface)); // for VNC
QXcbWindow *xcbWindow = new QXcbWindow(window);
xcbWindow->create();
return xcbWindow;
}
QPlatformWindow *QXcbIntegration::createForeignWindow(QWindow *window, WId nativeHandle) const
{
return new QXcbForeignWindow(window, nativeHandle);
}
#ifndef QT_NO_OPENGL
QPlatformOpenGLContext *QXcbIntegration::createPlatformOpenGLContext(QOpenGLContext *context) const
{
QXcbGlIntegration *glIntegration = m_connection->glIntegration();
if (!glIntegration) {
qWarning("QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled");
return nullptr;
}
return glIntegration->createPlatformOpenGLContext(context);
}
# if QT_CONFIG(xcb_glx_plugin)
QOpenGLContext *QXcbIntegration::createOpenGLContext(GLXContext context, void *visualInfo, QOpenGLContext *shareContext) const
{
using namespace QNativeInterface::Private;
if (auto *glxIntegration = dynamic_cast<QGLXIntegration*>(m_connection->glIntegration()))
return glxIntegration->createOpenGLContext(context, visualInfo, shareContext);
else
return nullptr;
}
# endif
#if QT_CONFIG(egl)
QOpenGLContext *QXcbIntegration::createOpenGLContext(EGLContext context, EGLDisplay display, QOpenGLContext *shareContext) const
{
using namespace QNativeInterface::Private;
if (auto *eglIntegration = dynamic_cast<QEGLIntegration*>(m_connection->glIntegration()))
return eglIntegration->createOpenGLContext(context, display, shareContext);
else
return nullptr;
}
#endif
#endif // QT_NO_OPENGL
QPlatformBackingStore *QXcbIntegration::createPlatformBackingStore(QWindow *window) const
{
QPlatformBackingStore *backingStore = nullptr;
const bool isTrayIconWindow = QXcbWindow::isTrayIconWindow(window);
if (isTrayIconWindow) {
backingStore = new QXcbSystemTrayBackingStore(window);
} else {
backingStore = new QXcbBackingStore(window);
}
Q_ASSERT(backingStore);
return backingStore;
}
QPlatformOffscreenSurface *QXcbIntegration::createPlatformOffscreenSurface(QOffscreenSurface *surface) const
{
QXcbScreen *screen = static_cast<QXcbScreen *>(surface->screen()->handle());
QXcbGlIntegration *glIntegration = screen->connection()->glIntegration();
if (!glIntegration) {
qWarning("QXcbIntegration: Cannot create platform offscreen surface, neither GLX nor EGL are enabled");
return nullptr;
}
return glIntegration->createPlatformOffscreenSurface(surface);
}
bool QXcbIntegration::hasCapability(QPlatformIntegration::Capability cap) const
{
switch (cap) {
case OpenGL:
case ThreadedOpenGL:
{
if (const auto *integration = connection()->glIntegration())
return cap != ThreadedOpenGL || integration->supportsThreadedOpenGL();
return false;
}
case ThreadedPixmaps:
case WindowMasks:
case MultipleWindows:
case ForeignWindows:
case ChildWindows:
case SyncState:
case MouseCursorPositioning:
return true;
case OffscreenSurface:
return m_connection->glIntegration() && m_connection->glIntegration()->canCreatePlatformOffscreenSurface();
case SwitchableWidgetComposition:
{
return m_connection->glIntegration()
&& m_connection->glIntegration()->supportsSwitchableWidgetComposition();
}
default: return QPlatformIntegration::hasCapability(cap);
}
}
QAbstractEventDispatcher *QXcbIntegration::createEventDispatcher() const
{
return QXcbEventDispatcher::createEventDispatcher(connection());
}
static const auto xsNetCursorBlink = "Net/CursorBlink"_ba;
static const auto xsNetCursorBlinkTime = "Net/CursorBlinkTime"_ba;
static const auto xsNetDoubleClickTime = "Net/DoubleClickTime"_ba;
static const auto xsNetDoubleClickDistance = "Net/DoubleClickDistance"_ba;
static const auto xsNetDndDragThreshold = "Net/DndDragThreshold"_ba;
void QXcbIntegration::initialize()
{
const auto defaultInputContext = "compose"_L1;
// Perform everything that may potentially need the event dispatcher (timers, socket
// notifiers) here instead of the constructor.
auto icStrs = QPlatformInputContextFactory::requested();
if (icStrs.isEmpty())
icStrs = { defaultInputContext };
m_inputContext.reset(QPlatformInputContextFactory::create(icStrs));
if (!m_inputContext && !icStrs.contains(defaultInputContext)
&& icStrs != QStringList{"none"_L1})
m_inputContext.reset(QPlatformInputContextFactory::create(defaultInputContext));
connection()->keyboard()->initialize();
auto notifyThemeChanged = [](QXcbVirtualDesktop *, const QByteArray &, const QVariant &, void *) {
QWindowSystemInterface::handleThemeChange();
};
auto *xsettings = connection()->primaryScreen()->xSettings();
xsettings->registerCallbackForProperty(xsNetCursorBlink, notifyThemeChanged, this);
xsettings->registerCallbackForProperty(xsNetCursorBlinkTime, notifyThemeChanged, this);
xsettings->registerCallbackForProperty(xsNetDoubleClickTime, notifyThemeChanged, this);
xsettings->registerCallbackForProperty(xsNetDoubleClickDistance, notifyThemeChanged, this);
xsettings->registerCallbackForProperty(xsNetDndDragThreshold, notifyThemeChanged, this);
}
void QXcbIntegration::moveToScreen(QWindow *window, int screen)
{
Q_UNUSED(window);
Q_UNUSED(screen);
}
QPlatformFontDatabase *QXcbIntegration::fontDatabase() const
{
return m_fontDatabase.data();
}
QPlatformNativeInterface * QXcbIntegration::nativeInterface() const
{
return m_nativeInterface.data();
}
#ifndef QT_NO_CLIPBOARD
QPlatformClipboard *QXcbIntegration::clipboard() const
{
return m_connection->clipboard();
}
#endif
#if QT_CONFIG(draganddrop)
#include <private/qsimpledrag_p.h>
QPlatformDrag *QXcbIntegration::drag() const
{
static const bool useSimpleDrag = qEnvironmentVariableIsSet("QT_XCB_USE_SIMPLE_DRAG");
if (Q_UNLIKELY(useSimpleDrag)) { // This is useful for testing purposes
static QSimpleDrag *simpleDrag = nullptr;
if (!simpleDrag)
simpleDrag = new QSimpleDrag();
return simpleDrag;
}
return m_connection->drag();
}
#endif
QPlatformInputContext *QXcbIntegration::inputContext() const
{
return m_inputContext.data();
}
#if QT_CONFIG(accessibility)
QPlatformAccessibility *QXcbIntegration::accessibility() const
{
#if !defined(QT_NO_ACCESSIBILITY_ATSPI_BRIDGE)
if (!m_accessibility) {
Q_ASSERT_X(QCoreApplication::eventDispatcher(), "QXcbIntegration",
"Initializing accessibility without event-dispatcher!");
m_accessibility.reset(new QSpiAccessibleBridge());
}
#endif
return m_accessibility.data();
}
#endif
QPlatformServices *QXcbIntegration::services() const
{
return m_services.data();
}
QPlatformKeyMapper *QXcbIntegration::keyMapper() const
{
return m_connection->keyboard();
}
QStringList QXcbIntegration::themeNames() const
{
return QGenericUnixTheme::themeNames();
}
QPlatformTheme *QXcbIntegration::createPlatformTheme(const QString &name) const
{
return QGenericUnixTheme::createUnixTheme(name);
}
#define RETURN_VALID_XSETTINGS(key) { \
auto value = connection()->primaryScreen()->xSettings()->setting(key); \
if (value.isValid()) return value; \
}
QVariant QXcbIntegration::styleHint(QPlatformIntegration::StyleHint hint) const
{
switch (hint) {
case QPlatformIntegration::CursorFlashTime: {
bool ok = false;
// If cursor blinking is off, returns 0 to keep the cursor awlays display.
if (connection()->primaryScreen()->xSettings()->setting(xsNetCursorBlink).toInt(&ok) == 0 && ok)
return 0;
RETURN_VALID_XSETTINGS(xsNetCursorBlinkTime);
break;
}
case QPlatformIntegration::MouseDoubleClickInterval:
RETURN_VALID_XSETTINGS(xsNetDoubleClickTime);
break;
case QPlatformIntegration::MouseDoubleClickDistance:
RETURN_VALID_XSETTINGS(xsNetDoubleClickDistance);
break;
case QPlatformIntegration::KeyboardInputInterval:
case QPlatformIntegration::StartDragTime:
case QPlatformIntegration::KeyboardAutoRepeatRate:
case QPlatformIntegration::PasswordMaskDelay:
case QPlatformIntegration::StartDragVelocity:
case QPlatformIntegration::UseRtlExtensions:
case QPlatformIntegration::PasswordMaskCharacter:
case QPlatformIntegration::FlickMaximumVelocity:
case QPlatformIntegration::FlickDeceleration:
// TODO using various xcb, gnome or KDE settings
break; // Not implemented, use defaults
case QPlatformIntegration::FlickStartDistance:
case QPlatformIntegration::StartDragDistance: {
RETURN_VALID_XSETTINGS(xsNetDndDragThreshold);
// The default (in QPlatformTheme::defaultThemeHint) is 10 pixels, but
// on a high-resolution screen it makes sense to increase it.
qreal dpi = 100;
if (const QXcbScreen *screen = connection()->primaryScreen()) {
if (screen->logicalDpi().first > dpi)
dpi = screen->logicalDpi().first;
if (screen->logicalDpi().second > dpi)
dpi = screen->logicalDpi().second;
}
return (hint == QPlatformIntegration::FlickStartDistance ? qreal(15) : qreal(10)) * dpi / qreal(100);
}
case QPlatformIntegration::ShowIsFullScreen:
// X11 always has support for windows, but the
// window manager could prevent it (e.g. matchbox)
return false;
case QPlatformIntegration::ReplayMousePressOutsidePopup:
return false;
default:
break;
}
return QPlatformIntegration::styleHint(hint);
}
static QString argv0BaseName()
{
QString result;
const QStringList arguments = QCoreApplication::arguments();
if (!arguments.isEmpty() && !arguments.front().isEmpty()) {
result = arguments.front();
const int lastSlashPos = result.lastIndexOf(u'/');
if (lastSlashPos != -1)
result.remove(0, lastSlashPos + 1);
}
return result;
}
static const char resourceNameVar[] = "RESOURCE_NAME";
QByteArray QXcbIntegration::wmClass() const
{
if (m_wmClass.isEmpty()) {
// Instance name according to ICCCM 4.1.2.5
QString name;
if (m_instanceName)
name = QString::fromLocal8Bit(m_instanceName);
if (name.isEmpty() && qEnvironmentVariableIsSet(resourceNameVar))
name = qEnvironmentVariable(resourceNameVar);
if (name.isEmpty())
name = argv0BaseName();
// Note: QCoreApplication::applicationName() cannot be called from the QGuiApplication constructor,
// hence this delayed initialization.
QString className = QCoreApplication::applicationName();
if (className.isEmpty()) {
className = argv0BaseName();
if (!className.isEmpty() && className.at(0).isLower())
className[0] = className.at(0).toUpper();
}
if (!name.isEmpty() && !className.isEmpty())
m_wmClass = std::move(name).toLocal8Bit() + '\0' + std::move(className).toLocal8Bit() + '\0';
}
return m_wmClass;
}
#if QT_CONFIG(xcb_sm)
QPlatformSessionManager *QXcbIntegration::createPlatformSessionManager(const QString &id, const QString &key) const
{
return new QXcbSessionManager(id, key);
}
#endif
void QXcbIntegration::sync()
{
m_connection->sync();
}
// For QApplication::beep()
void QXcbIntegration::beep() const
{
QScreen *priScreen = QGuiApplication::primaryScreen();
if (!priScreen)
return;
QPlatformScreen *screen = priScreen->handle();
if (!screen)
return;
xcb_connection_t *connection = static_cast<QXcbScreen *>(screen)->xcb_connection();
xcb_bell(connection, 0);
xcb_flush(connection);
}
#if QT_CONFIG(vulkan)
QPlatformVulkanInstance *QXcbIntegration::createPlatformVulkanInstance(QVulkanInstance *instance) const
{
return new QXcbVulkanInstance(instance);
}
#endif
void QXcbIntegration::setApplicationBadge(qint64 number)
{
auto unixServices = dynamic_cast<QDesktopUnixServices *>(services());
unixServices->setApplicationBadge(number);
}
QString QXcbUnixServices::portalWindowIdentifier(QWindow *window)
{
return "x11:"_L1 + QString::number(window->winId(), 16);
}
void QXcbUnixServices::registerDBusMenuForWindow(QWindow *window, const QString &service, const QString &path)
{
const QByteArray serviceValue = service.toLatin1();
const QByteArray pathValue = path.toLatin1();
xcb_change_property(xcb_connection(),
XCB_PROP_MODE_REPLACE, window->winId(),
atom(QXcbAtom::Atom_KDE_NET_WM_APPMENU_SERVICE_NAME),
XCB_ATOM_STRING, 8,
serviceValue.length(),
serviceValue.constData());
xcb_change_property(xcb_connection(),
XCB_PROP_MODE_REPLACE, window->winId(),
atom(QXcbAtom::Atom_KDE_NET_WM_APPMENU_OBJECT_PATH),
XCB_ATOM_STRING, 8,
pathValue.length(),
pathValue.constData());
}
void QXcbUnixServices::unregisterDBusMenuForWindow(QWindow *window)
{
xcb_delete_property(xcb_connection(), window->winId(), atom(QXcbAtom::Atom_KDE_NET_WM_APPMENU_SERVICE_NAME));
xcb_delete_property(xcb_connection(), window->winId(), atom(QXcbAtom::Atom_KDE_NET_WM_APPMENU_OBJECT_PATH));
}
QT_END_NAMESPACE