Draft implementation of wasm shaper

.gitignore

@@ -3,3 +3,4 @@ Cargo.lock
 .directory
 .DS_Store
 /src/complex/*.ri
+.vscode

Cargo.toml

@@ -21,6 +21,7 @@ unicode-bidi-mirroring = "0.3.0"
 unicode-ccc = "0.3.0"
 unicode-properties = { version = "0.1.0", default-features = false, features = ["general-category"] }
 unicode-script = "0.5.2"
+wasmtime = "22.0.0"
 
 [dependencies.ttf-parser]
 version = "0.24.0"

src/hb/buffer.rs

@@ -120,7 +120,7 @@ pub struct GlyphPosition {
     /// How much the glyph moves on the Y-axis before drawing it, this should
     /// not affect how much the line advances.
     pub y_offset: i32,
-    var: u32,
+    pub(crate) var: u32,
 }
 
 unsafe impl bytemuck::Zeroable for GlyphPosition {}

src/hb/face.rs

@@ -369,6 +369,7 @@ impl<'a> hb_font_t<'a> {
 }
 
 #[derive(Clone, Copy, Default)]
+#[repr(C)]
 pub struct hb_glyph_extents_t {
     pub x_bearing: i32,
     pub y_bearing: i32,

src/hb/mod.rs

@@ -50,6 +50,8 @@ mod ot_shaper_vowel_constraints;
 mod paint_extents;
 mod set_digest;
 pub mod shape;
+// featurething
+mod shape_wasm;
 mod tag;
 mod tag_table;
 mod text_parser;