Enum wayland_protocols::presentation_time::client::wp_presentation_feedback::Kind

#[repr(u32)]
pub enum Kind {
    Vsync,
    HwClock,
    HwCompletion,
    ZeroCopy,
}

bitmask of flags in presented event

These flags provide information about how the presentation of the related content update was done. The intent is to help clients assess the reliability of the feedback and the visual quality with respect to possible tearing and timings. The flags are:

VSYNC: The presentation was synchronized to the “vertical retrace” by the display hardware such that tearing does not happen. Relying on user space scheduling is not acceptable for this flag. If presentation is done by a copy to the active frontbuffer, then it must guarantee that tearing cannot happen.

HW_CLOCK: The display hardware provided measurements that the hardware driver converted into a presentation timestamp. Sampling a clock in user space is not acceptable for this flag.

HW_COMPLETION: The display hardware signalled that it started using the new image content. The opposite of this is e.g. a timer being used to guess when the display hardware has switched to the new image content.

ZERO_COPY: The presentation of this update was done zero-copy. This means the buffer from the client was given to display hardware as is, without copying it. Compositing with OpenGL counts as copying, even if textured directly from the client buffer. Possible zero-copy cases include direct scanout of a fullscreen surface and a surface on a hardware overlay.

Variants

Vsync

presentation was vsync’d

HwClock

hardware provided the presentation timestamp

HwCompletion

hardware signalled the start of the presentation

ZeroCopy

presentation was done zero-copy

Implementations

impl Kind

pub fn from_raw(n: u32) -> Option<Kind>

pub fn to_raw(&self) -> u32

Trait Implementations

impl Clone for Kind

fn clone(&self) -> Kind

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Kind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq<Kind> for Kind

fn eq(&self, other: &Kind) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Kind

impl StructuralPartialEq for Kind