Fix PNG decoder returning Rust-owned ImageData

codecs/png/src/lib.rs

@@ -1,7 +1,22 @@
 use std::io::Cursor;
 
 use wasm_bindgen::prelude::*;
-use web_sys::ImageData;
+use wasm_bindgen::Clamped;
+
+// Custom ImageData bindings to allow construction with
+// a JS-owned copy of the data.
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(typescript_type = ImageData)]
+    pub type ImageData;
+
+    #[wasm_bindgen(constructor)]
+    fn new_with_owned_u8_clamped_array_and_sh(
+        data: Clamped<Vec<u8>>,
+        sw: u32,
+        sh: u32,
+    ) -> ImageData;
+}
 
 #[wasm_bindgen(catch)]
 pub fn encode(data: &[u8], width: u32, height: u32) -> Vec<u8> {
@@ -38,10 +53,9 @@ pub fn decode(data: &[u8]) -> ImageData {
         }
     }
 
-    ImageData::new_with_u8_clamped_array_and_sh(
-        wasm_bindgen::Clamped(&mut buf),
+    ImageData::new_with_owned_u8_clamped_array_and_sh(
+        wasm_bindgen::Clamped(buf),
         info.width,
         info.height,
     )
-    .unwrap()
 }