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Diffstat (limited to 'src/gui/platform/unix/qtx11extras.cpp')
| -rw-r--r-- | src/gui/platform/unix/qtx11extras.cpp | 514 |
1 files changed, 514 insertions, 0 deletions
diff --git a/src/gui/platform/unix/qtx11extras.cpp b/src/gui/platform/unix/qtx11extras.cpp new file mode 100644 index 0000000000..ef37518d95 --- /dev/null +++ b/src/gui/platform/unix/qtx11extras.cpp @@ -0,0 +1,514 @@ +// Copyright (C) 2021 The Qt Company Ltd. +// Copyright (C) 2016 Richard Moore <rich@kde.org> +// Copyright (C) 2016 David Faure <david.faure@kdab.com> +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#include "qtx11extras_p.h" + +#include <qpa/qplatformnativeinterface.h> +#include <qpa/qplatformwindow.h> +#include <qpa/qplatformscreen_p.h> +#include <qpa/qplatformscreen.h> +#include <qscreen.h> +#include <qwindow.h> +#include <qguiapplication.h> +#include <xcb/xcb.h> +#include <QtCore/qdebug.h> + +QT_BEGIN_NAMESPACE + +using namespace Qt::StringLiterals; + +static QScreen *findScreenForVirtualDesktop(int virtualDesktopNumber) +{ + const auto screens = QGuiApplication::screens(); + for (QScreen *screen : screens) { + auto *qxcbScreen = dynamic_cast<QNativeInterface::Private::QXcbScreen *>(screen->handle()); + if (qxcbScreen && qxcbScreen->virtualDesktopNumber() == virtualDesktopNumber) + return screen; + } + return nullptr; +} + +/*! + \class QX11Info + \inmodule QtGui + \since 6.2 + \internal + + \brief Provides information about the X display configuration. + + The class provides two APIs: a set of non-static functions that + provide information about a specific widget or pixmap, and a set + of static functions that provide the default information for the + application. + + \warning This class is only available on X11. For querying + per-screen information in a portable way, use QScreen. +*/ + +/*! + Constructs an empty QX11Info object. +*/ +QX11Info::QX11Info() +{ +} + +/*! + Returns true if the application is currently running on X11. + + \since 6.2 + */ +bool QX11Info::isPlatformX11() +{ + return QGuiApplication::platformName() == "xcb"_L1; +} + +/*! + Returns the horizontal resolution of the given \a screen in terms of the + number of dots per inch. + + The \a screen argument is an X screen number. Be aware that if + the user's system uses Xinerama (as opposed to traditional X11 + multiscreen), there is only one X screen. Use QScreen to + query for information about Xinerama screens. + + \sa appDpiY() +*/ +int QX11Info::appDpiX(int screen) +{ + if (screen == -1) { + const QScreen *scr = QGuiApplication::primaryScreen(); + if (!scr) + return 75; + return qRound(scr->logicalDotsPerInchX()); + } + + QScreen *scr = findScreenForVirtualDesktop(screen); + if (!scr) + return 0; + + return scr->logicalDotsPerInchX(); +} + +/*! + Returns the vertical resolution of the given \a screen in terms of the + number of dots per inch. + + The \a screen argument is an X screen number. Be aware that if + the user's system uses Xinerama (as opposed to traditional X11 + multiscreen), there is only one X screen. Use QScreen to + query for information about Xinerama screens. + + \sa appDpiX() +*/ +int QX11Info::appDpiY(int screen) +{ + if (screen == -1) { + const QScreen *scr = QGuiApplication::primaryScreen(); + if (!scr) + return 75; + return qRound(scr->logicalDotsPerInchY()); + } + + QScreen *scr = findScreenForVirtualDesktop(screen); + if (!scr) + return 0; + + return scr->logicalDotsPerInchY(); +} + +/*! + Returns a handle for the applications root window on the given \a screen. + + The \a screen argument is an X screen number. Be aware that if + the user's system uses Xinerama (as opposed to traditional X11 + multiscreen), there is only one X screen. Use QScreen to + query for information about Xinerama screens. +*/ +quint32 QX11Info::appRootWindow(int screen) +{ + if (!qApp) + return 0; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return 0; + QScreen *scr = screen == -1 ? QGuiApplication::primaryScreen() : findScreenForVirtualDesktop(screen); + if (!scr) + return 0; + return static_cast<xcb_window_t>(reinterpret_cast<quintptr>(native->nativeResourceForScreen(QByteArrayLiteral("rootwindow"), scr))); +} + +/*! + Returns the number of the screen where the application is being + displayed. + + This method refers to screens in the original X11 meaning with a + different DISPLAY environment variable per screen. + This information is only useful if your application needs to know + on which X screen it is running. + + In a typical multi-head configuration, multiple physical monitors + are combined in one X11 screen. This means this method returns the + same number for each of the physical monitors. In such a setup you + are interested in the monitor information as provided by the X11 + RandR extension. This is available through QScreen. + + \sa display() +*/ +int QX11Info::appScreen() +{ + if (!qApp) + return 0; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return 0; + return reinterpret_cast<qintptr>(native->nativeResourceForIntegration(QByteArrayLiteral("x11screen"))); +} + +/*! + Returns the X11 time. + + \sa setAppTime(), appUserTime() +*/ +quint32 QX11Info::appTime() +{ + if (!qApp) + return 0; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return 0; + QScreen* screen = QGuiApplication::primaryScreen(); + return static_cast<xcb_timestamp_t>(reinterpret_cast<quintptr>(native->nativeResourceForScreen("apptime", screen))); +} + +/*! + Returns the X11 user time. + + \sa setAppUserTime(), appTime() +*/ +quint32 QX11Info::appUserTime() +{ + if (!qApp) + return 0; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return 0; + QScreen* screen = QGuiApplication::primaryScreen(); + return static_cast<xcb_timestamp_t>(reinterpret_cast<quintptr>(native->nativeResourceForScreen("appusertime", screen))); +} + +/*! + Sets the X11 time to the value specified by \a time. + + \sa appTime(), setAppUserTime() +*/ +void QX11Info::setAppTime(quint32 time) +{ + if (!qApp) + return; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return; + typedef void (*SetAppTimeFunc)(QScreen *, xcb_timestamp_t); + QScreen* screen = QGuiApplication::primaryScreen(); + SetAppTimeFunc func = reinterpret_cast<SetAppTimeFunc>(reinterpret_cast<void *>(native->nativeResourceFunctionForScreen("setapptime"))); + if (func) + func(screen, time); + else + qWarning("Internal error: QPA plugin doesn't implement setAppTime"); +} + +/*! + Sets the X11 user time as specified by \a time. + + \sa appUserTime(), setAppTime() +*/ +void QX11Info::setAppUserTime(quint32 time) +{ + if (!qApp) + return; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return; + typedef void (*SetAppUserTimeFunc)(QScreen *, xcb_timestamp_t); + QScreen* screen = QGuiApplication::primaryScreen(); + SetAppUserTimeFunc func = reinterpret_cast<SetAppUserTimeFunc>(reinterpret_cast<void *>(native->nativeResourceFunctionForScreen("setappusertime"))); + if (func) + func(screen, time); + else + qWarning("Internal error: QPA plugin doesn't implement setAppUserTime"); +} + +/*! + Fetches the current X11 time stamp from the X Server. + + This method creates a property notify event and blocks till it is + received back from the X Server. +*/ +quint32 QX11Info::getTimestamp() +{ + if (!qApp) + return 0; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return 0; + QScreen* screen = QGuiApplication::primaryScreen(); + return static_cast<xcb_timestamp_t>(reinterpret_cast<quintptr>(native->nativeResourceForScreen("gettimestamp", screen))); +} + +/*! + Returns the startup ID that will be used for the next window to be shown by this process. + + After the next window is shown, the next startup ID will be empty. + + http://standards.freedesktop.org/startup-notification-spec/startup-notification-latest.txt + + \sa setNextStartupId() +*/ +QByteArray QX11Info::nextStartupId() +{ + if (!qApp) + return QByteArray(); + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return QByteArray(); + return static_cast<char *>(native->nativeResourceForIntegration("startupid")); +} + +/*! + Sets the next startup ID to \a id. + + This is the startup ID that will be used for the next window to be shown by this process. + + The startup ID of the first window comes from the environment variable DESKTOP_STARTUP_ID. + This method is useful for subsequent windows, when the request comes from another process + (e.g. via DBus). + + \sa nextStartupId() +*/ +void QX11Info::setNextStartupId(const QByteArray &id) +{ + if (!qApp) + return; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return; + typedef void (*SetStartupIdFunc)(const char*); + SetStartupIdFunc func = reinterpret_cast<SetStartupIdFunc>(reinterpret_cast<void *>(native->nativeResourceFunctionForIntegration("setstartupid"))); + if (func) + func(id.constData()); + else + qWarning("Internal error: QPA plugin doesn't implement setStartupId"); +} + +/*! + Returns the default display for the application. + + \sa appScreen() +*/ +Display *QX11Info::display() +{ + if (!qApp) + return nullptr; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return nullptr; + + void *display = native->nativeResourceForIntegration(QByteArray("display")); + return reinterpret_cast<Display *>(display); +} + +/*! + Returns the default XCB connection for the application. + + \sa display() +*/ +xcb_connection_t *QX11Info::connection() +{ + if (!qApp) + return nullptr; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return nullptr; + + void *connection = native->nativeResourceForIntegration(QByteArray("connection")); + return reinterpret_cast<xcb_connection_t *>(connection); +} + +/*! + Returns true if there is a compositing manager running for the connection + attached to \a screen. + + If \a screen equals -1, the application's primary screen is used. +*/ +bool QX11Info::isCompositingManagerRunning(int screen) +{ + if (!qApp) + return false; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return false; + + QScreen *scr = screen == -1 ? QGuiApplication::primaryScreen() : findScreenForVirtualDesktop(screen); + if (!scr) { + qWarning() << "isCompositingManagerRunning: Could not find screen number" << screen; + return false; + } + + return native->nativeResourceForScreen(QByteArray("compositingEnabled"), scr); +} + +/*! + Returns a new peeker id or -1 if some internal error has occurred. + Each peeker id is associated with an index in the buffered native + event queue. + + For more details see QX11Info::PeekOption and peekEventQueue(). + + \sa peekEventQueue(), removePeekerId() +*/ +qint32 QX11Info::generatePeekerId() +{ + if (!qApp) + return -1; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return -1; + + typedef qint32 (*GeneratePeekerIdFunc)(void); + GeneratePeekerIdFunc generatepeekerid = reinterpret_cast<GeneratePeekerIdFunc>( + reinterpret_cast<void *>(native->nativeResourceFunctionForIntegration("generatepeekerid"))); + if (!generatepeekerid) { + qWarning("Internal error: QPA plugin doesn't implement generatePeekerId"); + return -1; + } + + return generatepeekerid(); +} + +/*! + Removes \a peekerId, which was earlier obtained via generatePeekerId(). + + Returns \c true on success or \c false if unknown peeker id was + provided or some internal error has occurred. + + \sa generatePeekerId() +*/ +bool QX11Info::removePeekerId(qint32 peekerId) +{ + if (!qApp) + return false; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return false; + + typedef bool (*RemovePeekerIdFunc)(qint32); + RemovePeekerIdFunc removePeekerId = reinterpret_cast<RemovePeekerIdFunc>( + reinterpret_cast<void *>(native->nativeResourceFunctionForIntegration("removepeekerid"))); + if (!removePeekerId) { + qWarning("Internal error: QPA plugin doesn't implement removePeekerId"); + return false; + } + + return removePeekerId(peekerId); +} + +/*! + \enum QX11Info::PeekOption + \brief An enum to tune the behavior of QX11Info::peekEventQueue(). + + \value PeekDefault + Peek from the beginning of the buffered native event queue. A peeker + id is optional with PeekDefault. If a peeker id is provided to + peekEventQueue() when using PeekDefault, then peeking starts from + the beginning of the queue, not from the cached index; thus, this + can be used to manually reset a cached index to peek from the start + of the queue. When this operation completes, the associated index + will be updated to the new position in the queue. + + \value PeekFromCachedIndex + QX11Info::peekEventQueue() can optimize the peeking algorithm by + skipping events that it already has seen in earlier calls to + peekEventQueue(). When control returns to the main event loop, + which causes the buffered native event queue to be flushed to Qt's + event queue, the cached indices are marked invalid and will be + reset on the next access. The same is true if the program + explicitly flushes the buffered native event queue by + QCoreApplication::processEvents(). +*/ + +/*! + \typedef QX11Info::PeekerCallback + Typedef for a pointer to a function with the following signature: + + \code + bool (*PeekerCallback)(xcb_generic_event_t *event, void *peekerData); + \endcode + + The \a event is a native XCB event. + The \a peekerData is a pointer to data, passed in via peekEventQueue(). + + Return \c true from this function to stop examining the buffered + native event queue or \c false to continue. + + \note A non-capturing lambda can serve as a PeekerCallback. +*/ + +/*! + \brief Peek into the buffered XCB event queue. + + You can call peekEventQueue() periodically, when your program is busy + performing a long-running operation, to peek into the buffered native + event queue. The more time the long-running operation blocks the + program from returning control to the main event loop, the more + events will accumulate in the buffered XCB event queue. Once control + returns to the main event loop these events will be flushed to Qt's + event queue, which is a separate event queue from the queue this + function is peeking into. + + \note It is usually better to run CPU-intensive operations in a + non-GUI thread, instead of blocking the main event loop. + + The buffered XCB event queue is populated from a non-GUI thread and + therefore might be ahead of the current GUI state. To handle native + events as they are processed by the GUI thread, see + QAbstractNativeEventFilter::nativeEventFilter(). + + The \a peeker is a callback function as documented in PeekerCallback. + The \a peekerData can be used to pass in arbitrary data to the \a + peeker callback. + The \a option is an enum that tunes the behavior of peekEventQueue(). + The \a peekerId is used to track an index in the queue, for more + details see QX11Info::PeekOption. There can be several indices, + each tracked individually by a peeker id obtained via generatePeekerId(). + + This function returns \c true when the peeker has stopped the event + proccesing by returning \c true from the callback. If there were no + events in the buffered native event queue to peek at or all the + events have been processed by the peeker, this function returns \c + false. + + \sa generatePeekerId(), QAbstractNativeEventFilter::nativeEventFilter() +*/ +bool QX11Info::peekEventQueue(PeekerCallback peeker, void *peekerData, PeekOptions option, + qint32 peekerId) +{ + if (!peeker || !qApp) + return false; + QPlatformNativeInterface *native = qApp->platformNativeInterface(); + if (!native) + return false; + + typedef bool (*PeekEventQueueFunc)(PeekerCallback, void *, PeekOptions, qint32); + PeekEventQueueFunc peekeventqueue = reinterpret_cast<PeekEventQueueFunc>( + reinterpret_cast<void *>(native->nativeResourceFunctionForIntegration("peekeventqueue"))); + if (!peekeventqueue) { + qWarning("Internal error: QPA plugin doesn't implement peekEventQueue"); + return false; + } + + return peekeventqueue(peeker, peekerData, option, peekerId); +} + +QT_END_NAMESPACE |