Struct GlyphCache

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pub struct GlyphCache { /* private fields */ }

Expand description

Per-frame glyph vertex cache shared by one [GlGfxCtx] instance.

Create once alongside GlGfxCtx::new and keep alive for the lifetime of the rendering context. Do not clear between frames.

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impl GlyphCache

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pub fn new() -> Self

Create an empty cache.

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pub fn get_or_insert( &mut self, font: &Font, glyph_id: u16, size: f64, ) -> Option<&CachedGlyph>

Return the cached tessellation for (font, glyph_id, size), tessellating on first access.

Returns None for glyphs with no visible outline (space, tab, etc.).

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pub fn len(&self) -> usize

Number of entries (including None entries for non-outline glyphs).

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pub fn is_empty(&self) -> bool

True when no glyphs have been cached yet.

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pub fn clear(&mut self)

Discard all cached tessellations. Only needed when the GL context is recreated (e.g., window resize on some platforms that destroy the surface).

Trait Implementations§

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impl Default for GlyphCache

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl UnwindSafe for GlyphCache

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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where T: ?Sized,

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fn borrow(&self) -> &T

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fn borrow_mut(&mut self) -> &mut T

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Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.

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Converts &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.

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Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.

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where T: Any + Send,

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Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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