Struct CosmicTextProvider 

pub struct CosmicTextProvider { /* private fields */ }

Legacy cosmic-text provider for compatibility.

NOT RECOMMENDED: Use JagTextProvider (harfrust + swash) instead. Only kept for testing/comparison purposes.

A text provider backed by cosmic-text for shaping and swash for rasterization. Produces RGB subpixel masks from swash grayscale coverage.

Implementations

impl CosmicTextProvider

pub fn from_bytes( bytes: &[u8], orientation: SubpixelOrientation, ) -> Result<Self>

Construct with a custom font (preferred for demo parity with SimpleFontdueProvider)

pub fn from_system_fonts(orientation: SubpixelOrientation) -> Self

Construct using system fonts (fallbacks handled by cosmic-text)

Trait Implementations

impl TextProvider for CosmicTextProvider

fn rasterize_run(&self, run: &TextRun) -> Vec<RasterizedGlyph>

fn line_metrics(&self, px: f32) -> Option<LineMetrics>

fn shape_paragraph(&self, _text: &str, _px: f32) -> Option<ShapedParagraph>

Optional paragraph shaping hook for advanced wrappers.

fn cache_tag(&self) -> u64

Optional cache tag to distinguish providers in text caches. The default implementation returns 0, which is sufficient when a single provider is used with a given PassManager.

fn measure_run(&self, run: &TextRun) -> f32

Measure the total advance width of a styled text run (in the same pixel units as run.size). The default delegates to shape_paragraph, ignoring weight/style/family. Providers that support multiple font faces should override this to select the correct face.

fn register_web_font( &self, _family: &str, _data: Vec<u8>, _weight: u16, _style: FontStyle, ) -> Result<bool>

Register a web font from raw TTF/OTF bytes. Returns Ok(true) if newly registered, Ok(false) if already present. Default implementation returns Ok(false) (no-op).