Enum Damage 

pub enum Damage {
    None,
    Regions(Vec<Rect>),
    Full,
}

What changed between two frames, in logical pixels.

Variants

None

Nothing changed; the previous frame is still valid (skip present).

Regions(Vec<Rect>)

Only these rectangles changed.

Full

Everything must be repainted (first frame, resize, or an overlay change the tree diff can’t localize).

Implementations

impl Damage

pub fn is_empty(&self) -> bool

true if nothing changed.

pub fn bounding(&self) -> Option<Rect>

The single rectangle covering all damage, or None for Damage::None. Damage::Full has no finite bound, so it also returns None.

pub fn to_physical(&self, scale: ScaleFactor, bounds: Rect) -> Vec<Rect>

Convert to physical-pixel rectangles for Surface::present, clamped to a bounds (the surface size) and rounded outward to whole pixels.

Damage::None and Damage::Full both yield an empty list — which the Surface contract reads as “assume everything changed”. Callers that want to skip a no-op present should check Damage::is_empty first.

Trait Implementations

impl Clone for Damage

fn clone(&self) -> Damage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Damage

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

Formats the value using the given formatter.

impl PartialEq for Damage

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl StructuralPartialEq for Damage