LibWeb: Implement transfer {,receiving} steps for ImageBitmap

Author: https://github.com/kennethmyhra
Commit: ed3d0d76ec
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5445
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/HTML/ImageBitmap.cpp

@@ -82,25 +82,32 @@ WebIDL::ExceptionOr<void> ImageBitmap::deserialization_steps(HTML::TransferDataD
     return {};
 }
 
-WebIDL::ExceptionOr<void> ImageBitmap::transfer_steps(HTML::TransferDataEncoder&)
+// https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#the-imagebitmap-interface:transfer-steps
+WebIDL::ExceptionOr<void> ImageBitmap::transfer_steps(HTML::TransferDataEncoder& data_holder)
 {
-    // FIXME: Implement this
-    dbgln("(STUBBED) ImageBitmap::transfer_steps(HTML::TransferDataEncoder&)");
+    // FIXME: 1. If value's origin-clean flag is not set, then throw a "DataCloneError" DOMException.
+
+    // 2. Set dataHolder.[[BitmapData]] to value's bitmap data.
+    serialize_bitmap(data_holder, *m_bitmap);
+
+    // 3. Unset value's bitmap data.
+    m_bitmap = nullptr;
+
     return {};
 }
 
-WebIDL::ExceptionOr<void> ImageBitmap::transfer_receiving_steps(HTML::TransferDataDecoder&)
+// https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#the-imagebitmap-interface:transfer-receiving-steps
+WebIDL::ExceptionOr<void> ImageBitmap::transfer_receiving_steps(HTML::TransferDataDecoder& data_holder)
 {
-    // FIXME: Implement this
-    dbgln("(STUBBED) ImageBitmap::transfer_receiving_steps(HTML::TransferDataDecoder&)");
+    // 1. Set value's bitmap data to dataHolder.[[BitmapData]].
+    m_bitmap = TRY(deserialize_bitmap(this->realm(), data_holder));
+
     return {};
 }
 
 HTML::TransferType ImageBitmap::primary_interface() const
 {
-    // FIXME: Implement this
-    dbgln("(STUBBED) ImageBitmap::primary_interface()");
-    return TransferType::Unknown;
+    return TransferType::ImageBitmap;
 }
 
 // https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#dom-imagebitmap-width

Libraries/LibWeb/HTML/StructuredSerialize.cpp

@@ -1147,6 +1147,11 @@ static WebIDL::ExceptionOr<GC::Ref<Bindings::PlatformObject>> create_transferred
         TRY(transform_stream->transfer_receiving_steps(decoder));
         return transform_stream;
     }
+    case TransferType::ImageBitmap: {
+        auto image_bitmap = target_realm.create<ImageBitmap>(target_realm);
+        TRY(image_bitmap->transfer_receiving_steps(decoder));
+        return image_bitmap;
+    }
     case TransferType::ArrayBuffer:
     case TransferType::ResizableArrayBuffer:
     case TransferType::Unknown:

Libraries/LibWeb/HTML/StructuredSerializeTypes.h

@@ -44,6 +44,7 @@ enum class TransferType : u8 {
     ReadableStream = 4,
     WritableStream = 5,
     TransformStream = 6,
+    ImageBitmap = 7,
 };
 
 }