Crate oxitext_shape 

oxitext-shape — Swash-based text shaper for OxiText.

Provides SwashShaper, which wraps swash’s ShapeContext and produces ShapedRuns from UTF-8 text + raw font bytes.

M1: LTR Latin shaping. Bidi (M2) and script-specific itemisation (M3) are deferred.

M3 additions

• backend: Swappable backend::ShapeBackend trait, with the default backend::SwashShaperBackend wrapper and optional [backend::RustybuzzShaper] (feature rustybuzz-backend).

M5 additions (Slice 5a)

• cache: Bounded LRU shape cache (cache::ShapeCache, cache::ShapeKey) backed by lru::LruCache.
• SwashShaper::with_cache: creates a SwashShaper with an attached ShapeCache; subsequent shape() calls check the cache before invoking swash.

Feature-aware shaping (Slice 6)

• ShapeFeature: an OpenType feature tag-value pair.
• ShapeDirection: direction enum (Ltr/Rtl/Ttb/Btt).
• ShapeRequest / ShapeRequestBuilder: builder pattern for a full shaping request including text, font, size, direction, script, language, and a list of ShapeFeatures.
• SwashShaper::shape_request: shapes a complete ShapeRequest, with automatic vert/vrt2 feature injection for top-to-bottom text.
• SwashShaper::shape_with_features: lower-level entry point that accepts a feature slice directly.

Re-exports

pub use backend::ShapeBackend;

pub use backend::SwashShaperBackend;

pub use cache::FontId;

pub use cache::ShapeCache;

pub use cache::ShapeKey;

pub use script_detect::requires_arabic_shaping;

pub use script_detect::requires_indic_shaping;

pub use script_detect::requires_mark_positioning;

Modules

backend

Swappable text shaping backends.

batch

Batch shaping: shape multiple text segments in a single call.

cache

Bounded LRU shape cache for crate::SwashShaper.

script_detect

Script detection helpers for oxitext-shape.

variational

Variable font support and vertical shaping tests.

Structs

ShapeFeature

An OpenType feature tag-value pair.

ShapeRequest

A complete shaping request with all parameters.

ShapeRequestBuilder

Builder for ShapeRequest.

ShapeResult

Extended shaping result with metadata.

SwashShaper

Text shaper backed by swash.

Enums

ShapeDirection

Text direction for a shaping request.

ShapeRequestError

Errors that can occur when building a ShapeRequest.

Functions

detect_emoji_zwj_sequences

Returns byte ranges in text that correspond to ZWJ-joined emoji sequences.

find_kashida_opportunities

Returns glyph indices (into glyphs) after which a kashida stretch can be inserted for Arabic justification.