Struct wr_glyph_rasterizer::rasterizer::FontInstanceKeyMap

pub struct FontInstanceKeyMap(Arc<RwLock<FontInstanceKeyMapLocked>>);

A map of namespace-local font instance keys to shared keys. Weak references are used to track the liveness of each key mapping as other consumers of BaseFontInstance might hold strong references to the entry. A mapping from BaseFontInstance to the shared key is then used to determine which shared key to assign to that instance. When the weak count of the mapping is zero, the entry is allowed to expire. Again, care must be taken when clearing a namespace within the key map as it may cause shared key expirations that require individual processing. Shared instance keys will be created within the provided unique namespace.

Tuple Fields

0: Arc<RwLock<FontInstanceKeyMapLocked>>

Implementations

impl FontInstanceKeyMap

pub fn new(namespace: IdNamespace) -> Self

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

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

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

pub fn map_key(&self, key: &FontInstanceKey) -> FontInstanceKey

pub fn add_key( &mut self, instance: BaseFontInstance, ) -> Option<Arc<BaseFontInstance>>

pub fn delete_key(&mut self, key: &FontInstanceKey) -> Option<FontInstanceKey>

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

Trait Implementations

impl Clone for FontInstanceKeyMap

fn clone(&self) -> FontInstanceKeyMap

Returns a copy of the value.

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

Performs copy-assignment from source.