1 files changed, 60 insertions, 0 deletions
diff --git a/rust/wasm/src/masks.rs b/rust/wasm/src/masks.rs
new file mode 100644
index 00000000..e4f30e21
--- /dev/null
+++ b/rust/wasm/src/masks.rs
@@ -0,0 +1,60 @@
+#![cfg(target_arch = "wasm32")]
+
+use gpu::wgpu;
+use js_sys::Object;
+use wasm_bindgen::{JsCast, JsValue, prelude::wasm_bindgen};
+
+use crate::gpu::{
+    import_canvas_texture, read_f32_property, read_offscreen_canvas_property, read_u32_property,
+    render_texture_to_canvas, with_gpu_runtime,
+};
+
+struct ApplyMaskFeatherOptions {
+    mask: wgpu::web_sys::OffscreenCanvas,
+    width: u32,
+    height: u32,
+    feather: f32,
+}
+
+#[wasm_bindgen(js_name = applyMaskFeather)]
+pub fn apply_mask_feather(options: JsValue) -> Result<wgpu::web_sys::OffscreenCanvas, JsValue> {
+    let ApplyMaskFeatherOptions {
+        mask,
+        width,
+        height,
+        feather,
+    } = parse_apply_mask_feather_options(options)?;
+
+    with_gpu_runtime(|runtime| {
+        let mask_texture = import_canvas_texture(
+            &runtime.context,
+            &mask,
+            width,
+            height,
+            "masks-input-texture",
+        );
+        let result_texture = runtime.masks.apply_mask_feather(
+            &runtime.context,
+            masks::ApplyMaskFeatherOptions {
+                mask: &mask_texture,
+                width,
+                height,
+                feather,
+            },
+        );
+        render_texture_to_canvas(&runtime.context, &result_texture, width, height)
+    })
+}
+
+fn parse_apply_mask_feather_options(value: JsValue) -> Result<ApplyMaskFeatherOptions, JsValue> {
+    let object: Object = value
+        .dyn_into()
+        .map_err(|_| JsValue::from_str("applyMaskFeather expects an options object"))?;
+
+    Ok(ApplyMaskFeatherOptions {
+        mask: read_offscreen_canvas_property(&object, "mask")?,
+        width: read_u32_property(&object, "width")?,
+        height: read_u32_property(&object, "height")?,
+        feather: read_f32_property(&object, "feather")?,
+    })
+}