Struct RasterizedGlyphCache 

pub struct RasterizedGlyphCache { /* private fields */ }

Cache for pre-rasterized glyph alpha bitmaps.

Stores rendered glyphs indexed by font, glyph ID, and quantized size. None entries mean “this glyph was looked up but has no outline” (negative cache).

Implementations

impl RasterizedGlyphCache

pub fn new() -> Self

Create a new empty cache.

pub fn quantize_size(size: f32) -> u32

Quantize a font size to the nearest 0.5pt for cache key generation.

pub fn get(&self, key: &RasterGlyphKey) -> Option<&Option<RasterGlyph>>

Look up a cached glyph. Returns:

• Some(Some(glyph)) — cached rasterized glyph
• Some(None) — negative cache hit (glyph has no outline)
• None — cache miss

pub fn insert(&mut self, key: RasterGlyphKey, glyph: Option<RasterGlyph>)

Insert a rasterized glyph (or negative cache entry) into the cache.

If the cache is full, evicts approximately 25% of entries.

pub fn len(&self) -> usize

Returns the number of entries in the cache.

pub fn is_empty(&self) -> bool

Returns true if the cache is empty.

Trait Implementations

impl Debug for RasterizedGlyphCache

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

Formats the value using the given formatter.

impl Default for RasterizedGlyphCache

fn default() -> Self

Returns the “default value” for a type.