diff --git a/video/out/cocoa-cb/window.swift b/video/out/cocoa-cb/window.swift
index 90438591ab..55c0fa1688 100644
--- a/video/out/cocoa-cb/window.swift
+++ b/video/out/cocoa-cb/window.swift
@@ -474,6 +474,7 @@ class Window: NSWindow, NSWindowDelegate {
 
     func windowDidChangeBackingProperties(_ notification: Notification) {
         cocoaCB.layer?.contentsScale = backingScaleFactor
+        cocoaCB.flagEvents(VO_EVENT_WIN_STATE)
     }
 
     func windowWillStartLiveResize(_ notification: Notification) {
diff --git a/video/out/cocoa_cb_common.swift b/video/out/cocoa_cb_common.swift
index 6e016812ab..b677fd6740 100644
--- a/video/out/cocoa_cb_common.swift
+++ b/video/out/cocoa_cb_common.swift
@@ -485,6 +485,12 @@ class CocoaCB: NSObject {
                 return VO_TRUE
             }
             return VO_FALSE
+        case VOCTRL_GET_HIDPI_SCALE:
+            if let scaleFactor = data?.assumingMemoryBound(to: CDouble.self) {
+                scaleFactor.pointee = Double(ccb.window?.backingScaleFactor ?? 1.0)
+                return VO_TRUE;
+            }
+            return VO_FALSE
         case VOCTRL_RESTORE_SCREENSAVER:
             ccb.enableDisplaySleep()
             return VO_TRUE