Method new_for_gobject

gi/object.cpp:3570–3609

* ObjectInstance::new_for_gobject: * * Creates a new JSObject wrapper for the GObject pointer @gobj, and an * ObjectInstance private structure to go along with it. */

 * ObjectInstance private structure to go along with it.
 */
ObjectInstance* ObjectInstance::new_for_gobject(JSContext* cx, GObject* gobj) {
    g_assert(gobj && "Cannot create JSObject for null GObject pointer");

    GType gtype = G_TYPE_FROM_INSTANCE(gobj);

    gjs_debug_marshal(GJS_DEBUG_GOBJECT, "Wrapping %s %p with JSObject",
                      g_type_name(gtype), gobj);

    JS::RootedObject proto(cx, gjs_lookup_object_prototype(cx, gtype));
    if (!proto)
        return nullptr;

    JS::RootedObject obj(
        cx, JS_NewObjectWithGivenProto(cx, &ObjectBase::klass, proto));
    if (!obj)
        return nullptr;

    ObjectPrototype* prototype = resolve_prototype(cx, proto);
    if (!prototype)
        return nullptr;

    auto* priv = new ObjectInstance(prototype, obj);

    ObjectBase::init_private(obj, priv);

    g_object_ref_sink(gobj);
    priv->associate_js_gobject(cx, obj, gobj);

    g_assert(priv->wrapper() == obj.get());

    GTypeQuery query;
    g_type_query(gtype, &query);
    g_assert(query.type);
    if (strcmp(query.type_name, "GdkPixbuf") == 0) {
       int32_t total_memory = estimate_size_of_gdkpixbuf(gobj);
       JS::AddAssociatedMemory(obj, total_memory, MemoryUse::GdkPixbuf);
       JS::SetReservedSlot(obj, MEMORY_SIZE, JS::Int32Value(total_memory));
    }
    return priv;
}

/**
 * ObjectInstance::wrapper_from_gobject: