Struct Thumbnails 

pub struct Thumbnails { /* private fields */ }

A read-only view of the thumbnail entries the build segment holds: the asset-name-to-key map, and the PNG bytes each key addresses.

Reading is best effort throughout. An absent, unreadable, or foreign segment opens as None and a key that resolves to nothing reads as None, which costs a consumer its previews and never more than that.

Implementations

impl Thumbnails

pub fn open() -> Option<Self>

Open the anchored build segment. None when nothing anchored one, when the running binary cannot be identified, or when the segment holds no thumbnail set (a deleted cache/ reads this way).

pub fn names(&self) -> &[(String, String)]

Asset name paired with the key of its thumbnail, in bake order.

pub fn revision(&self) -> u64

What the set is at: the same value for two segments holding the same thumbnails under the same names, a different one as soon as either moves. A consumer caching decoded images reloads on a change of this and nothing else.

pub fn png(&self, key: &str) -> Option<Vec<u8>>

The PNG bytes stored under key, read from the segment. None when the entry is absent, or when the file was replaced under the reader (a build publishes by rename, so a stale offset reads short or reads bytes that fail to decode).