Struct SwashShaperBackend 

pub struct SwashShaperBackend { /* private fields */ }

Swash-based shaper — delegates to crate::SwashShaper.

This adapter wraps the existing crate::SwashShaper (which has its own internal LRU cache) and exposes it via the ShapeBackend trait.

Uses std::sync::RwLock instead of Mutex so that read-only operations (e.g. ShapeBackend::supports_script) can proceed concurrently. Shape calls still acquire the write lock because the underlying crate::SwashShaper mutates its internal context on every call.

Implementations

impl SwashShaperBackend

pub fn new() -> Self

Creates a new SwashShaperBackend.

Trait Implementations

impl Default for SwashShaperBackend

fn default() -> Self

Returns the “default value” for a type.

impl ShapeBackend for SwashShaperBackend

fn shape( &self, face_data: &Arc<[u8]>, text: &str, px_size: f32, ) -> Vec<ShapedGlyph>

Shape UTF-8 text using font bytes face_data at px_size pixels-per-em, returning one ShapedGlyph per output glyph.

fn shape_with_direction( &self, face_data: &Arc<[u8]>, text: &str, px_size: f32, rtl: bool, ) -> Vec<ShapedGlyph>

Shape UTF-8 text with an explicit direction hint.

fn shape_with_features( &self, face_data: &Arc<[u8]>, text: &str, px_size: f32, features: &[ShapeFeature], ) -> Vec<ShapedGlyph>

Shape UTF-8 text with an explicit set of OpenType feature overrides.

fn shape_with_options( &self, face_data: &Arc<[u8]>, text: &str, px_size: f32, rtl: bool, features: &[ShapeFeature], _options: &ShapeRequest<'_>, ) -> Vec<ShapedGlyph>

Shape text with extended options.

fn supports_script(&self, font_data: &Arc<[u8]>, script: [u8; 4]) -> bool

Check if the font has shaping support for a given OpenType script tag.