Implement IPlugView::onSize()

src/common/logging/vst3.cpp

@@ -297,6 +297,19 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(bool is_host_vst,
+                             const YaPlugView::OnSize& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        // This static cast is technically not correct of course but it's
+        // UTF-16, so everything's allowed
+        message << request.owner_instance_id
+                << ": IPlugView::onSize(newSize = <ViewRect* with left = "
+                << request.new_size.left << ", top = " << request.new_size.top
+                << ", right = " << request.new_size.right
+                << ", bottom = " << request.new_size.bottom << ">)";
+    });
+}
+
 bool Vst3Logger::log_request(bool is_host_vst,
                              const YaPlugView::GetSize& request) {
     return log_request_base(is_host_vst, [&](auto& message) {

src/common/logging/vst3.h

@@ -94,6 +94,7 @@ class Vst3Logger {
     bool log_request(bool is_host_vst, const YaPlugView::OnWheel&);
     bool log_request(bool is_host_vst, const YaPlugView::OnKeyDown&);
     bool log_request(bool is_host_vst, const YaPlugView::OnKeyUp&);
+    bool log_request(bool is_host_vst, const YaPlugView::OnSize&);
     bool log_request(bool is_host_vst, const YaPlugView::GetSize&);
     bool log_request(bool is_host_vst, const YaPluginBase::Initialize&);
     bool log_request(bool is_host_vst, const YaPluginBase::Terminate&);

src/common/serialization/vst3.h

@@ -83,6 +83,7 @@ using ControlRequest = std::variant<Vst3PlugViewProxy::Destruct,
                                     YaPlugView::OnWheel,
                                     YaPlugView::OnKeyDown,
                                     YaPlugView::OnKeyUp,
+                                    YaPlugView::OnSize,
                                     YaPlugView::GetSize,
                                     YaPluginBase::Initialize,
                                     YaPluginBase::Terminate,

src/common/serialization/vst3/plug-view/plug-view.h

@@ -235,6 +235,25 @@ class YaPlugView : public Steinberg::IPlugView {
     };
 
     virtual tresult PLUGIN_API getSize(Steinberg::ViewRect* size) override = 0;
+
+    /**
+     * Message to pass through a call to `IPlugView::onSize(new_size)` to the
+     * Wine plugin host.
+     */
+    struct OnSize {
+        using Response = UniversalTResult;
+
+        native_size_t owner_instance_id;
+
+        Steinberg::ViewRect new_size;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(owner_instance_id);
+            s.object(new_size);
+        }
+    };
+
     virtual tresult PLUGIN_API
     onSize(Steinberg::ViewRect* newSize) override = 0;
     virtual tresult PLUGIN_API onFocus(TBool state) override = 0;

src/plugin/bridges/vst3-impls/plug-view-proxy.cpp

@@ -105,9 +105,14 @@ tresult PLUGIN_API Vst3PlugViewProxyImpl::getSize(Steinberg::ViewRect* size) {
 }
 
 tresult PLUGIN_API Vst3PlugViewProxyImpl::onSize(Steinberg::ViewRect* newSize) {
-    // TODO: Implement
+    if (newSize) {
-    bridge.logger.log("TODO: IPlugView::onSize()");
+        return bridge.send_message(YaPlugView::OnSize{
-    return Steinberg::kNotImplemented;
+            .owner_instance_id = owner_instance_id(), .new_size = *newSize});
+    } else {
+        bridge.logger.log(
+            "WARNING: Null pointer passed to 'IPlugView::onSize()'");
+        return Steinberg::kInvalidArgument;
+    }
 }
 
 tresult PLUGIN_API Vst3PlugViewProxyImpl::onFocus(TBool state) {

src/wine-host/bridges/vst3.cpp

@@ -387,6 +387,10 @@ void Vst3Bridge::run() {
                     .plug_view->onKeyUp(request.key, request.key_code,
                                         request.modifiers);
             },
+            [&](YaPlugView::OnSize& request) -> YaPlugView::OnKeyUp::Response {
+                return object_instances[request.owner_instance_id]
+                    .plug_view->onSize(&request.new_size);
+            },
             [&](YaPlugView::GetSize& request) -> YaPlugView::GetSize::Response {
                 const tresult result =
                     object_instances[request.owner_instance_id]