avm2: Hookup `DisplayObject.opaqueBackground`

core/src/avm2/globals/flash/display/display_object.rs

@@ -1005,28 +1005,34 @@ pub fn set_cache_as_bitmap<'gc>(
 
 /// `opaqueBackground`'s getter.
 pub fn get_opaque_background<'gc>(
-    activation: &mut Activation<'_, 'gc>,
-    _this: Option<Object<'gc>>,
+    _activation: &mut Activation<'_, 'gc>,
+    this: Option<Object<'gc>>,
     _args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
-    avm2_stub_getter!(
-        activation,
-        "flash.display.DisplayObject",
-        "opaqueBackground"
-    );
+    if let Some(color) = this
+        .and_then(|this| this.as_display_object())
+        .and_then(|this| this.opaque_background())
+    {
+        return Ok(color.to_rgb().into());
+    }
+
     Ok(Value::Null)
 }
 
 /// `opaqueBackground`'s setter.
 pub fn set_opaque_background<'gc>(
     activation: &mut Activation<'_, 'gc>,
-    _this: Option<Object<'gc>>,
-    _args: &[Value<'gc>],
+    this: Option<Object<'gc>>,
+    args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
-    avm2_stub_setter!(
-        activation,
-        "flash.display.DisplayObject",
-        "opaqueBackground"
-    );
+    if let Some(dobj) = this.and_then(|this| this.as_display_object()) {
+        let value = args.get(0).unwrap_or(&Value::Undefined);
+        let color = match value {
+            Value::Null | Value::Undefined => None,
+            value => Some(Color::from_rgb(value.coerce_to_u32(activation)?, 255)),
+        };
+        dobj.set_opaque_background(activation.context.gc_context, color);
+    }
+
     Ok(Value::Undefined)
 }

tests/tests/swfs/avm2/displayobject_opaque_background/output.txt

@@ -0,0 +1,6 @@
+null
+255
+null
+255
+null
+255

tests/tests/swfs/avm2/displayobject_opaque_background/test.toml

@@ -0,0 +1,9 @@
+num_frames = 1
+# FIXME - does not rendered correctly
+ignore = true
+
+[image_comparison]
+tolerance = 1
+
+[player_options]
+with_renderer = { optional = true, sample_count = 1 }