Struct CanvasKey 

pub struct CanvasKey(pub u64);

A stable, user-provided cache key for hosted canvas resources.

Callers should treat this as an identity key for a logical draw item that is stable across frames (e.g. “grid label #42”). The runtime mixes in scale-factor bits where needed, so the same key can be reused across DPI/zoom changes.

Tuple Fields

0: u64

Implementations

impl CanvasKey

pub const fn new(value: u64) -> Self

pub fn combine(self, value: u64) -> Self

Combine a child identifier into this key.

pub fn combine_hash<T: Hash>(self, value: &T) -> Self

Combine a deterministic hash of value into this key.

pub fn from_hash<T: Hash>(value: &T) -> Self

Compute a deterministic hash for value.

This uses a fixed-seed FNV-1a hasher (unlike DefaultHasher, which is randomized).

Trait Implementations

impl Clone for CanvasKey

fn clone(&self) -> CanvasKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CanvasKey

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

Formats the value using the given formatter.

impl From<CanvasKey> for u64

fn from(value: CanvasKey) -> Self

Converts to this type from the input type.

impl From<u64> for CanvasKey

fn from(value: u64) -> Self

Converts to this type from the input type.

impl Hash for CanvasKey

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 CanvasKey

fn eq(&self, other: &CanvasKey) -> 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 Copy for CanvasKey

impl Eq for CanvasKey

impl StructuralPartialEq for CanvasKey