Enum BufferAge 

pub enum BufferAge {
    Undefined,
    Frames(u32),
}

How stale the contents of the buffer just acquired are.

Modelled on EGL_EXT_buffer_age. With N-buffering the buffer handed back holds the contents of frame current - age, so a correct incremental repaint must cover the union of the last age frames’ damage — not just this frame’s.

Variants

Undefined

Contents are undefined. Repaint everything.

Returned after a resize, on the first frame, and by backends that cannot track age (most compositor-mediated ones).

Frames(u32)

Contents are those of the frame n presents ago. 1 means the buffer we most recently presented, i.e. single buffering or a persistent shadow.

Trait Implementations

impl Clone for BufferAge

fn clone(&self) -> BufferAge

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BufferAge

impl Debug for BufferAge

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

Formats the value using the given formatter.

impl Eq for BufferAge

impl Hash for BufferAge

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for BufferAge

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BufferAge