Struct TextResourceBudget 

pub struct TextResourceBudget {
    pub line_layout_cache_max_entries: usize,
    pub line_layout_cache_low_watermark: usize,
    pub raster_bounds_cache_max_entries: Option<usize>,
}

Text system resource budget.

Fields

line_layout_cache_max_entries: usize

Maximum number of entries in the global line-layout cache.

When the cache reaches this limit, older entries are evicted down to the low watermark. Default: 10 000.

Each entry occupies approximately 1.2 KB on average (varies with text length and font complexity).

line_layout_cache_low_watermark: usize

Target number of entries to retain after eviction.

When the cache exceeds line_layout_cache_max_entries, it evicts the oldest entries until only low_watermark remain. A larger gap between max and low watermark reduces eviction frequency but allows more peak memory usage. Default: 5 000.

raster_bounds_cache_max_entries: Option<usize>

Maximum number of entries in the glyph raster-bounds cache.

This cache maps RenderGlyphParams → Bounds<DevicePixels>. Each entry is small (~120 bytes), but without a limit the cache can grow unbounded when many distinct font/size/glyph combinations are used. When the limit is reached the entire cache is cleared (a simple generational strategy, since re-computing raster bounds is inexpensive compared to full text shaping).

Default: None (legacy behavior). Preset profiles may set a finite limit.

Trait Implementations

impl Clone for TextResourceBudget

fn clone(&self) -> TextResourceBudget

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextResourceBudget

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

Formats the value using the given formatter.