Struct ImageCache 

pub struct ImageCache { /* private fields */ }

A session-scoped cache of decoded images.

Owned by whatever is rendering or extracting, passed down by &mut — no global state, no interior mutability.

Implementations

impl ImageCache

pub fn new() -> Self

An empty cache.

pub fn len(&self) -> usize

How many images are cached.

pub fn is_empty(&self) -> bool

Whether nothing is cached.

pub fn bytes(&self) -> usize

Total bytes held.

pub fn get( &mut self, key: ObjRef, size: RequestedSize, ) -> Option<Arc<ImageData>>

Look an image up, refreshing its recency.

Three rungs: the exact key, then a full-resolution entry — which serves anything — then any entry whose decoded dimensions already cover the request in both axes. The third matters because a decoder is free to ignore the hint: an image asked for at 600x600 that came back at 5000x5000 is stored under the 600x600 request, and a later 300x300 request must find it rather than decode the same codestream again.

pub fn insert( &mut self, key: ObjRef, size: RequestedSize, image: Arc<ImageData>, )

Store an image, then evict.

pub fn clear(&mut self)

Drop everything.

Trait Implementations

impl Debug for ImageCache

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

Formats the value using the given formatter.

impl Default for ImageCache

fn default() -> ImageCache

Returns the “default value” for a type.