Add RenderBoxView and RBLayer integration

Package.swift

@@ -226,6 +226,7 @@ var sharedSwiftSettings: [SwiftSetting] = [
     .swiftLanguageMode(.v5),
 
     .define("OPENSWIFTUI_RELEASE_\(releaseVersion)"),
+    .unsafeFlags(["-Xfrontend", "-experimental-spi-only-imports"]),
 ]
 
 // Modified from: https://github.com/swiftlang/swift/blob/main/SwiftCompilerSources/Package.swift

Sources/COpenSwiftUI/Overlay/AppKit/OpenSwiftUI+NSWindow.h

@@ -0,0 +1,25 @@
+//
+//  OpenSwiftUI+NSWindow.h
+//  COpenSwiftUI
+
+#ifndef OpenSwiftUI_NSWindow_h
+#define OpenSwiftUI_NSWindow_h
+
+#include "OpenSwiftUIBase.h"
+
+#if OPENSWIFTUI_TARGET_OS_OSX
+
+#import <AppKit/AppKit.h>
+#import <CoreGraphics/CGDirectDisplay.h>
+
+OPENSWIFTUI_ASSUME_NONNULL_BEGIN
+
+OPENSWIFTUI_EXPORT
+CGDirectDisplayID _NSWindowGetCGDisplayID(NSWindow * _Nullable window);
+
+OPENSWIFTUI_ASSUME_NONNULL_END
+
+#endif /* OPENSWIFTUI_TARGET_OS_OSX */
+
+#endif /* OpenSwiftUI_NSWindow_h */
+

Sources/COpenSwiftUI/Overlay/AppKit/OpenSwiftUI+NSWindow.m

@@ -0,0 +1,16 @@
+//
+//  OpenSwiftUI+NSWindow.m
+//  COpenSwiftUI
+
+#import "OpenSwiftUI+NSWindow.h"
+
+#if OPENSWIFTUI_TARGET_OS_OSX
+
+CGDirectDisplayID _NSWindowGetCGDisplayID(NSWindow *window) {
+    NSScreen *screen = [window screen];
+    NSDictionary *deviceDescription = [screen deviceDescription];
+    NSNumber *screenNumber = deviceDescription[@"NSScreenNumber"];
+    return [screenNumber unsignedIntValue];
+}
+#endif
+

Sources/COpenSwiftUI/Shims/AppKit/AppKit_Private.h

@@ -27,6 +27,7 @@ typedef OPENSWIFTUI_ENUM(NSInteger, NSViewVibrantBlendingStyle) {
 };
 
 @interface NSView ()
+@property (getter=isOpaque) BOOL opaque;
 - (void)_updateLayerGeometryFromView;
 @end
 

Sources/OpenSwiftUI/Integration/Hosting/AppKit/NSViewPlatformViewDefinition.swift → Sources/OpenSwiftUI/Render/DisplayList/AppKitDisplayList.swift

@@ -1,17 +1,18 @@
 //
-//  NSViewPlatformViewDefinition.swift
+//  AppKitDisplayList.swift
 //  OpenSwiftUI
 //
 //  Audited for 6.0.87
 //  Status: WIP
-//  ID: 33EEAA67E0460DA84AE814EA027152BA (SwiftUI?)
+//  ID: 33EEAA67E0460DA84AE814EA027152BA (SwiftUI)
 
 #if os(macOS)
 @_spi(DisplayList_ViewSystem) import OpenSwiftUICore
 import AppKit
 import OpenSwiftUISymbolDualTestsSupport
 import COpenSwiftUI
-import CoreAnimation_Private
+import QuartzCore_Private
+import OpenSwiftUI_SPI
 
 // MARK: - NSViewPlatformViewDefinition [TODO]
 
@@ -84,6 +85,40 @@ final class NSViewPlatformViewDefinition: PlatformViewDefinition, @unchecked Sen
     }
 }
 
+// MARK: - _NSGraphicsView
+
+typealias PlatformGraphicsView = _NSGraphicsView
+
+class _NSGraphicsView: NSView {
+    var recursiveIgnoreHitTest: Bool = false
+
+    var customAcceptsFirstMouse: Bool?
+
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+}
+
+// MARK: - _NSInheritedView
+
+typealias PlatformInheritedView = _NSInheritedView
+
+class _NSInheritedView: _NSGraphicsView {
+    var hitTestsAsOpaque: Bool = false
+
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+}
+
 // MARK: - _NSProjectionView [6.5.4]
 
 @objc