Struct gdk4::FrameTimings[][src]

#[repr(transparent)]
pub struct FrameTimings(_);
Expand description

A FrameTimings object holds timing information for a single frame of the application’s displays.

To retrieve FrameTimings objects, use FrameClock::timings() or FrameClock::current_timings(). The information in FrameTimings is useful for precise synchronization of video with the event or audio streams, and for measuring quality metrics for the application’s display, such as latency and jitter.

Implementations

Returns whether @self are complete.

The timing information in a FrameTimings is filled in incrementally as the frame as drawn and passed off to the window system for processing and display to the user. The accessor functions for FrameTimings can return 0 to indicate an unavailable value for two reasons: either because the information is not yet available, or because it isn’t available at all.

Once this function returns true for a frame, you can be certain that no further values will become available and be stored in the FrameTimings.

Returns

true if all information that will be available for the frame has been filled in.

Gets the frame counter value of the FrameClock when this frame was drawn.

Returns

the frame counter value for this frame

Returns the frame time for the frame.

This is the time value that is typically used to time animations for the frame. See FrameClock::frame_time().

Returns

the frame time for the frame, in the timescale of g_get_monotonic_time()

Gets the predicted time at which this frame will be displayed.

Although no predicted time may be available, if one is available, it will be available while the frame is being generated, in contrast to presentation_time(), which is only available after the frame has been presented.

In general, if you are simply animating, you should use FrameClock::frame_time() rather than this function, but this function is useful for applications that want exact control over latency. For example, a movie player may want this information for Audio/Video synchronization.

Returns

The predicted time at which the frame will be presented, in the timescale of g_get_monotonic_time(), or 0 if no predicted presentation time is available.

Reurns the presentation time.

This is the time at which the frame became visible to the user.

Returns

the time the frame was displayed to the user, in the timescale of g_get_monotonic_time(), or 0 if no presentation time is available. See is_complete()

Gets the natural interval between presentation times for the display that this frame was displayed on.

Frame presentation usually happens during the “vertical blanking interval”.

Returns

the refresh interval of the display, in microseconds, or 0 if the refresh interval is not available. See is_complete().

Trait Implementations

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