PresentationTime QML Type
Provides tracking the timing when a frame is presented on screen. More...
Import Statement: | import QtWayland.Compositor.PresentationTime |
Since: | Qt 6.3 |
Instantiates: | QWaylandPresentationTime |
Methods
- void sendFeedback(Window window, int sequence, int sec, int nsec)
Detailed Description
The PresentationTime 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.
PresentationTime corresponds to the Wayland wp_presentation
interface.
To provide the functionality of the presentationtime extension in a compositor, create an instance of the PresentationTime component and add it to the list of extensions supported by the compositor:
Then, call sendFeedback() when a surface is presented on screen. Usually, the timing can be obtained from drm page flip event.
import QtWayland.Compositor.PresentationTime WaylandCompositor { PresentationTime { id: presentationTime } }
Method Documentation
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. sec and nsec hold the seconds and nanoseconds parts of the presentation timestamp, respectively.