Struct wr_glyph_rasterizer::FontKeyMap

pub struct FontKeyMap(Arc<RwLock<FontKeyMapLocked>>);

A shared map from fonts key local to a namespace to shared font keys that can be shared across many namespaces. Local keys are tracked in a hashmap that stores a strong reference per mapping so that their count can be tracked. A map of font templates is used to hash font templates to their final shared key. The shared key will stay alive so long as there are any strong references to the mapping entry. Care must be taken when clearing namespaces of shared keys as this may trigger shared font keys to expire which require individual processing. Shared font keys will be created within the provided unique namespace.

Tuple Fields

0: Arc<RwLock<FontKeyMapLocked>>

Implementations

impl FontKeyMap

pub fn new(namespace: IdNamespace) -> Self

fn lock(&self) -> RwLockReadGuard<'_, FontKeyMapLocked>

fn lock_mut(&mut self) -> RwLockWriteGuard<'_, FontKeyMapLocked>

pub fn keys(&self) -> Vec<FontKey>

pub fn map_key(&self, font_key: &FontKey) -> FontKey

pub fn add_key( &mut self, font_key: &FontKey, template: &FontTemplate ) -> Option<FontKey>

pub fn delete_key(&mut self, font_key: &FontKey) -> Option<FontKey>

pub fn clear_namespace(&mut self, namespace: IdNamespace) -> Vec<FontKey>

Trait Implementations

impl Clone for FontKeyMap

fn clone(&self) -> FontKeyMap

Returns a copy of the value.

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

Performs copy-assignment from source.