From 6b72a60d8cdc2c6bc13c50d093ba85125afc9bda Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Tue, 2 Jun 2026 14:25:06 +1000
Subject: [PATCH] WgpuMetalSurface_mac: switch to <AppKit/AppKit.h> umbrella

The narrow `<AppKit/NSView.h>` header only forward-declares NSWindow,
so `view.window.backingScaleFactor` fails to compile on macOS with:

    error: property 'backingScaleFactor' cannot be found in forward
           class object 'NSWindow'

Use the AppKit umbrella header so NSWindow's interface (including
backingScaleFactor) is in scope. Same idiomatic include any non-trivial
Cocoa code reaches for; we're already linking -framework Cocoa so
there's no compile-time cost beyond a slightly heavier translation
unit (the .mm is ~30 lines anyway).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 src/ifcviewer-wgpu/WgpuMetalSurface_mac.mm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ifcviewer-wgpu/WgpuMetalSurface_mac.mm b/src/ifcviewer-wgpu/WgpuMetalSurface_mac.mm
index 5aa7cd03ea..d4ac05fc77 100644
--- a/src/ifcviewer-wgpu/WgpuMetalSurface_mac.mm
+++ b/src/ifcviewer-wgpu/WgpuMetalSurface_mac.mm
@@ -7,7 +7,10 @@
 
 #if defined(__APPLE__)
 
-#import <AppKit/NSView.h>
+// The AppKit umbrella header pulls in NSWindow so `view.window`'s
+// `backingScaleFactor` resolves — `<AppKit/NSView.h>` alone only
+// forward-declares NSWindow.
+#import <AppKit/AppKit.h>
 #import <QuartzCore/CAMetalLayer.h>
 
 void* wgpu_macos_attach_metal_layer(void* nsview_ptr) {