QWaylandPresentationTime Class

The QWaylandPresentationTime class is an extension to get timing for on-screen presentation. More...

Header: #include <QWaylandPresentationTime>
CMake: find_package(Qt6 REQUIRED COMPONENTS WaylandCompositor)
target_link_libraries(mytarget PRIVATE Qt6::WaylandCompositor)
qmake: QT += waylandcompositor
Since: Qt 6.3
Instantiated By: PresentationTime
Inherits: QWaylandCompositorExtensionTemplate

Public Functions

QWaylandPresentationTime()
QWaylandPresentationTime(QWaylandCompositor *compositor)
void sendFeedback(QQuickWindow *window, quint64 sequence, quint64 tv_sec, quint32 tv_nsec)

Reimplemented Public Functions

virtual void initialize() override

Static Public Members

const struct wl_interface *interface()

Detailed Description

The QWaylandPresentationTime extension provides a way to track rendering timing for a surface. Client can request feedbacks associated with a surface, then compositor send events for the feedback with the time when the surface is presented on-screen.

QWaylandPresentationTime corresponds to the Wayland wp_presentation interface.

Member Function Documentation

QWaylandPresentationTime::QWaylandPresentationTime()

Constructs an empty QWaylandPresentationTime object.

QWaylandPresentationTime::QWaylandPresentationTime(QWaylandCompositor *compositor)

Constructs a QWaylandPresentationTime object for compositor.

[override virtual] void QWaylandPresentationTime::initialize()

Reimplements: QWaylandCompositorExtension::initialize().

Initializes the extension.

[static] const struct wl_interface *QWaylandPresentationTime::interface()

Returns the Wayland interface for the QWaylandPresentationTime.

[invokable] void QWaylandPresentationTime::sendFeedback(QQuickWindow *window, quint64 sequence, quint64 tv_sec, quint32 tv_nsec)

Interface to notify that a frame is presented on screen using window. If your platform supports DRM events, page_flip_handler is the proper timing to send it. The sequence is the refresh counter. tv_sec and tv_nsec hold the seconds and nanoseconds parts of the presentation timestamp, respectively.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.