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LibWeb+WebWorker: Use IPC mechanics for structured serialization

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Our structured serialization implementation had its own bespoke encoder
and decoder to serialize JS values. It also used a u32 buffer under the
hood, which made using its structures a bit awkward. We had previously
worked around its data structures in transferable streams, which nested
transfers of MessagePort instances. We basically had to add hooks into
the MessagePort to route to the correct transfer receiving steps, and
we could not invoke the correct AOs directly as the spec dictates.

We now use IPC mechanics to encode and decode data. This works because,
although we are encoding JS values, we are only ultimately encoding
primitive and basic AK types. The resulting data structures actually
enforce that we implement transferable streams exactly as the spec is
worded (I had planned to do that in a separate commit, but the fallout
of this patch actually required that change).
This commit is contained in:
Timothy Flynn 2025-07-17 09:51:04 -04:00 • committed by Tim Flynn
parent 7fad8c333d
commit 64abc6101d
Notes: github-actions[bot] 2025-07-18 14:10:44 +00:00
44 changed files with 765 additions and 970 deletions
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27
Libraries/LibWeb/HTML/ImageData.cpp
View file

@ -180,22 +180,22 @@ const JS::Uint8ClampedArray* ImageData::data() const
}
// https://html.spec.whatwg.org/multipage/canvas.html#pixel-manipulation:serialization-steps
WebIDL::ExceptionOr<void> ImageData::serialization_steps(SerializationRecord& serialized, bool for_storage, SerializationMemory& memory)
WebIDL::ExceptionOr<void> ImageData::serialization_steps(HTML::TransferDataEncoder& serialized, bool for_storage, HTML::SerializationMemory& memory)
{
auto& vm = this->vm();
// 1. Set serialized.[[Data]] to the sub-serialization of the value of value's data attribute.
auto serialized_data = TRY(structured_serialize_internal(vm, m_data, for_storage, memory));
serialized.extend(move(serialized_data));
serialized.append(move(serialized_data));
// 2. Set serialized.[[Width]] to the value of value's width attribute.
serialize_primitive_type(serialized, m_bitmap->width());
serialized.encode(m_bitmap->width());
// 3. Set serialized.[[Height]] to the value of value's height attribute.
serialize_primitive_type(serialized, m_bitmap->height());
serialized.encode(m_bitmap->height());
// 4. Set serialized.[[ColorSpace]] to the value of value's colorSpace attribute.
serialize_enum(serialized, m_color_space);
serialized.encode(m_color_space);
// FIXME:: 5. Set serialized.[[PixelFormat]] to the value of value's pixelFormat attribute.
@ -203,26 +203,25 @@ WebIDL::ExceptionOr<void> ImageData::serialization_steps(SerializationRecord& se
}
// https://html.spec.whatwg.org/multipage/canvas.html#pixel-manipulation:deserialization-steps
WebIDL::ExceptionOr<void> ImageData::deserialization_steps(ReadonlySpan<u32> const& serialized, size_t& position, DeserializationMemory& memory)
WebIDL::ExceptionOr<void> ImageData::deserialization_steps(HTML::TransferDataDecoder& serialized, HTML::DeserializationMemory& memory)
{
auto& vm = this->vm();
auto& realm = this->realm();
// 1. Initialize value's data attribute to the sub-deserialization of serialized.[[Data]].
auto [value, position_after_deserialization] = TRY(structured_deserialize_internal(vm, serialized, realm, memory, position));
if (value.has_value() && value.value().is_object() && is<JS::Uint8ClampedArray>(value.value().as_object())) {
m_data = as<JS::Uint8ClampedArray>(value.release_value().as_object());
}
position = position_after_deserialization;
auto deserialized = TRY(structured_deserialize_internal(vm, serialized, realm, memory));
if (auto* data = as_if<JS::Uint8ClampedArray>(deserialized.as_object()))
m_data = *data;
// 2. Initialize value's width attribute to serialized.[[Width]].
auto const width = deserialize_primitive_type<int>(serialized, position);
auto width = serialized.decode<int>();
// 3. Initialize value's height attribute to serialized.[[Height]].
auto const height = deserialize_primitive_type<int>(serialized, position);
auto height = serialized.decode<int>();
// 4. Initialize value's colorSpace attribute to serialized.[[ColorSpace]].
m_color_space = deserialize_primitive_type<Bindings::PredefinedColorSpace>(serialized, position);
m_color_space = serialized.decode<Bindings::PredefinedColorSpace>();
// FIXME: 5. Initialize value's pixelFormat attribute to serialized.[[PixelFormat]].