From 3831d97aaacae3bb5114357d88d374b0a7a82ead Mon Sep 17 00:00:00 2001
From: Jdansker <jdansker@iu.edu>
Date: Tue, 25 Nov 2025 21:20:51 -0500
Subject: [PATCH 1/2] Updated to MacOS Tahoe

Fixed cursor & optimized cpu usage.
---
 .DS_Store                           | Bin 0 -> 10244 bytes
 MouseHook/.DS_Store                 | Bin 0 -> 10244 bytes
 MouseHook/AppDelegate.swift         |  33 ++++++----
 MouseHook/Assets.xcassets/.DS_Store | Bin 0 -> 8196 bytes
 MouseHook/MouseViewController.swift |  99 ++++++++--------------------
 README.md                           |   2 +
 6 files changed, 53 insertions(+), 81 deletions(-)
 create mode 100644 .DS_Store
 create mode 100644 MouseHook/.DS_Store
 create mode 100644 MouseHook/Assets.xcassets/.DS_Store

diff --git a/.DS_Store b/.DS_Store
new file mode 100644
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diff --git a/MouseHook/.DS_Store b/MouseHook/.DS_Store
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diff --git a/MouseHook/AppDelegate.swift b/MouseHook/AppDelegate.swift
index 06ce34c..82f3dbd 100644
--- a/MouseHook/AppDelegate.swift
+++ b/MouseHook/AppDelegate.swift
@@ -18,6 +18,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
     private var refreshObserver: NSKeyValueObservation!
     private var eventMonitor: Any!
     private var cancellationToken: AnyCancellable?
+    private let eventQueue = DispatchQueue(label: "com.mousehook.events", qos: .userInteractive)
     
     @objc private dynamic var fastFreqRefresh: Bool = false
     
@@ -35,8 +36,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
             button.image = NSImage(named: NSImage.Name("mousehook-menubar"))
         }
         mouseController = MouseViewController()
-        fastEventThrottle = self.eventSubject.throttle(for: .seconds(1.0/60.0), scheduler: DispatchQueue.global(), latest: true) // 60Hz
-        slowEventThrottle = self.eventSubject.throttle(for: .seconds(1.0/5.0), scheduler: DispatchQueue.global(), latest: true) // 5Hz
+        fastEventThrottle = self.eventSubject.throttle(for: fastRefreshStride(), scheduler: eventQueue, latest: true)
+        slowEventThrottle = self.eventSubject.throttle(for: .seconds(1.0/5.0), scheduler: eventQueue, latest: true) // 5Hz
         
         setupMouseWindow()
         setupMenu()
@@ -47,12 +48,12 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
             
             let eventThrottle = change.newValue! ? self.fastEventThrottle : self.slowEventThrottle
             
-            self.cancellationToken = eventThrottle?.subscribe(on: DispatchQueue.global()).sink { event in
-                // Don't bother updating mouse position if it is currently hidden
-                DispatchQueue.main.async {
-                    self.update(event)
-                }
-            }
+            self.cancellationToken = eventThrottle?
+                .receive(on: DispatchQueue.main)
+                .sink(receiveValue: { [weak self] event in
+                    // Don't bother updating mouse position if it is currently hidden
+                    self?.update(event)
+                })
         })
         fastFreqRefresh = true
         
@@ -66,7 +67,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
         let cursorVisible = mouseController.update(event)
         
         if cursorVisible {
-            mouseWindow.setFrameOrigin(mouseController.getFrameOrigin(event.locationInWindow))
+            let mousePosition = NSEvent.mouseLocation
+            mouseWindow.setFrameOrigin(mouseController.getFrameOrigin(mousePosition))
         }
         // Only use fast refresh rate if the cursor is actually visible
         if (fastFreqRefresh != cursorVisible) {
@@ -78,7 +80,9 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
         mouseWindow = NSWindow(contentViewController: mouseController)
         mouseWindow.styleMask = [.borderless]
         mouseWindow.ignoresMouseEvents = true
-        mouseWindow.setFrame(NSRect(x: 0, y: 0, width: 50, height: 50), display: false)
+        let initialSize = mouseController.currentCursorSize == .zero ? NSSize(width: 50, height: 50) : mouseController.currentCursorSize
+        mouseWindow.setFrame(NSRect(origin: .zero, size: initialSize), display: false)
+        mouseWindow.hasShadow = false
         mouseWindow.backgroundColor = .clear
         mouseWindow.level = .screenSaver
         mouseWindow.orderFront(nil)
@@ -146,6 +150,14 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
         userDefaults.setActiveMonitors(enabledMonitors)
     }
 
+    private func fastRefreshStride() -> DispatchQueue.SchedulerTimeType.Stride {
+        let targetFPS = NSScreen.screens
+            .compactMap { $0.maximumFramesPerSecond }
+            .filter { $0 > 0 }
+            .max() ?? 60
+        return .seconds(1.0 / Double(targetFPS))
+    }
+
 }
 
 extension UserDefaults {
@@ -158,4 +170,3 @@ extension UserDefaults {
         set(enabledMonitors, forKey: "enabledMonitors")
     }
 }
-
diff --git a/MouseHook/Assets.xcassets/.DS_Store b/MouseHook/Assets.xcassets/.DS_Store
new file mode 100644
index 0000000000000000000000000000000000000000..25c8c5f9a4131ff0b68742330160162ccd32f4ba
GIT binary patch
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diff --git a/MouseHook/MouseViewController.swift b/MouseHook/MouseViewController.swift
index 4f92e4e..8bd373b 100644
--- a/MouseHook/MouseViewController.swift
+++ b/MouseHook/MouseViewController.swift
@@ -6,7 +6,6 @@
 //
 
 import Cocoa
-import CommonCrypto
 
 class MouseViewController: NSViewController {
     private var cursorImageView: NSImageView!
@@ -17,10 +16,7 @@ class MouseViewController: NSViewController {
     
     @objc private dynamic var currentCursor: NSCursor = NSCursor.current
     
-    private let pointingHandHash: String? = NSCursor.pointingHand.image.tiffRepresentation?.sha256
-    private let openHandHash: String? = NSCursor.openHand.image.tiffRepresentation?.sha256
-    private let closedHandHash: String? = NSCursor.closedHand.image.tiffRepresentation?.sha256
-    private let hideRefreshIntervalSecs = 1.5
+    var currentCursorSize: NSSize { currentCursor.image.size }
     
     override init(nibName nibNameOrNil: NSNib.Name?, bundle nibBundleOrNil: Bundle?) {
         super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
@@ -43,6 +39,7 @@ class MouseViewController: NSViewController {
         cursorImageView.image = currentCursor.image
         cursorImageView.imageScaling = .scaleNone
         cursorImageView.layer?.backgroundColor = NSColor.clear.cgColor
+        cursorImageView.frame = NSRect(origin: .zero, size: currentCursor.image.size)
         self.view = cursorImageView
         
         setupObservers()
@@ -55,45 +52,13 @@ class MouseViewController: NSViewController {
             }
         })
         cursorObserver = self.observe(\.currentCursor, options: [.initial, .new], changeHandler: { (this, change) in
-            self.cursorImageView.image = this.currentCursor.image
+            self.applyCurrentCursorImage()
         })
     }
     
-    /** These magic numbers work for the default mouse cursor at the default size on MacOS Monterey.
-     I can't guarantee it will work for custom mouse cursors or different OS versions, but I think it'll be pretty close. **/
     func getFrameOrigin(_ pt: NSPoint) -> NSPoint {
-        var offset: (Double, Double)
-        
-        // There is no simple way to check the exact image of a cursor, but size is cheap, easy, and works in most cases to determine the offset.
-        switch (currentCursor.image.size) {
-        case NSCursor.arrow.image.size:
-            offset = (21, 32)
-        case NSCursor.pointingHand.image.size:
-            // There are representations that match the size of pointingHand but not the offset, so check the hash of the image
-            switch (currentCursor.image.tiffRepresentation?.sha256) {
-            case pointingHandHash:
-                offset = (21.5, 32)
-            case openHandHash:
-                offset = (24.5, 24.5)
-            case closedHandHash:
-                offset = (24.5, 25)
-            default:
-                // It is likely a type of iBeam
-                offset = (24, 28)
-            }
-        case NSCursor.iBeam.image.size:
-            fallthrough
-        case NSCursor.resizeLeftRight.image.size:
-            offset = (24.5, 24.5)
-        case NSCursor.disappearingItem.image.size:
-            offset = (16.5, 38.5)
-        case NSCursor.dragLink.image.size:
-            offset = (28, 32)
-        default:
-            offset = (23.5, 25.5)
-        }
-        
-        return NSPoint(x: pt.x - offset.0, y: pt.y - offset.1)
+        let hotSpot = adjustedHotSpot()
+        return NSPoint(x: pt.x - hotSpot.x, y: pt.y - hotSpot.y)
     }
     
     
@@ -113,44 +78,38 @@ class MouseViewController: NSViewController {
     }
     
     func update(_ event: NSEvent) -> Bool {
-        if (NSCursor.currentSystem != nil) {
-            currentCursor = NSCursor.currentSystem!
+        if let systemCursor = NSCursor.currentSystem, systemCursor !== currentCursor {
+            currentCursor = systemCursor
         }
         
-        let screenBounds = currentMonitor?.frame
-        // Apply a small transform to the y axis to avoid it going out of bounds along the top axis
-        let mousePosition = event.locationInWindow.applying(CGAffineTransform(translationX: 0.0, y: -0.00001))
-        if (screenBounds?.contains(mousePosition) != true) {
+        let mousePosition = NSEvent.mouseLocation
+        if (currentMonitor?.frame.contains(mousePosition) != true) {
             resetCurrentMonitor(mousePosition)
         }
         
         return !cursorImageView.isHidden
     }
-}
-
-extension Data {
-    public var sha256:String {
-        get {
-            return hexStringFromData(input: digest(input: self as NSData))
-        }
-    }
-
-    private func digest(input : NSData) -> NSData {
-        let digestLength = Int(CC_SHA256_DIGEST_LENGTH)
-        var hash = [UInt8](repeating: 0, count: digestLength)
-        CC_SHA256(input.bytes, UInt32(input.length), &hash)
-        return NSData(bytes: hash, length: digestLength)
+    
+    private func applyCurrentCursorImage() {
+        let size = currentCursor.image.size
+        cursorImageView.image = currentCursor.image
+        cursorImageView.frame = NSRect(origin: .zero, size: size)
+        view.window?.setContentSize(size)
+        cursorImageView.layer?.contentsScale = currentMonitor?.backingScaleFactor ?? NSScreen.main?.backingScaleFactor ?? 1.0
     }
-
-    private  func hexStringFromData(input: NSData) -> String {
-        var bytes = [UInt8](repeating: 0, count: input.length)
-        input.getBytes(&bytes, length: input.length)
-
-        var hexString = ""
-        for byte in bytes {
-            hexString += String(format:"%02x", UInt8(byte))
+    
+    private func adjustedHotSpot() -> NSPoint {
+        var spot = currentCursor.hotSpot
+        if isArrowCursor() {
+            // Arrow hotspot appears to be measured from the top in recent macOS builds.
+            // Flip to a bottom-origin measurement so the overlay aligns with the system arrow tip.
+            spot = NSPoint(x: spot.x, y: currentCursor.image.size.height - spot.y)
         }
-
-        return hexString
+        return spot
+    }
+    
+    private func isArrowCursor() -> Bool {
+        let arrow = NSCursor.arrow
+        return currentCursor.image.size == arrow.image.size && currentCursor.hotSpot == arrow.hotSpot
     }
 }
diff --git a/README.md b/README.md
index 24b8a10..fdb4fa3 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 <img src="Media/mousehook-icon-1024x1024.png" width="256">
 
+**This app has recently been updated for MacOS Tahoe!**
+
 MouseHook is an open source macOS app written in Swift that allows you to hook a duplicate mouse cursor to your mouse's location and have it mimic the appearance of your mouse. This is especially useful for fixing the annoying issue where Parsec doesn't show the host mouse when using it as a monitor extender.
 
 Please note that MouseHook has only been developed and tested in my personal environment and I cannot provide any guarantees that it will work in other environments. Use at your own risk.

From ac2d7b7ff580e1658d48c80df0c8e6f3f3a2b6ad Mon Sep 17 00:00:00 2001
From: Jdansker <jdansker@iu.edu>
Date: Tue, 25 Nov 2025 21:46:31 -0500
Subject: [PATCH 2/2] Updated small behavior

Updated so that it's dock-only
---
 .DS_Store                   | Bin 10244 -> 14340 bytes
 MouseHook/AppDelegate.swift |   1 +
 MouseHook/main.swift        |   1 +
 README.md                   |   2 --
 4 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.DS_Store b/.DS_Store
index 51209be55d75c684c3f339290c79cb4e7a61e59d..1680888d2ec6e6ee5d23b6b1065767ef3b4d9488 100644
GIT binary patch
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diff --git a/MouseHook/AppDelegate.swift b/MouseHook/AppDelegate.swift
index 82f3dbd..6d4880e 100644
--- a/MouseHook/AppDelegate.swift
+++ b/MouseHook/AppDelegate.swift
@@ -31,6 +31,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate {
     }
 
     func applicationDidFinishLaunching(_ aNotification: Notification) {
+        NSApp.setActivationPolicy(.accessory) // hide Dock icon; status item only
         statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
         if let button = statusItem.button {
             button.image = NSImage(named: NSImage.Name("mousehook-menubar"))
diff --git a/MouseHook/main.swift b/MouseHook/main.swift
index 32ca55a..5316f4f 100644
--- a/MouseHook/main.swift
+++ b/MouseHook/main.swift
@@ -8,6 +8,7 @@
 import Cocoa
 
 let app = NSApplication.shared
+app.setActivationPolicy(.accessory) // menu bar only; hide Dock icon
 let delegate = AppDelegate()
 app.delegate = delegate
 
diff --git a/README.md b/README.md
index fdb4fa3..24b8a10 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,6 @@
 
 <img src="Media/mousehook-icon-1024x1024.png" width="256">
 
-**This app has recently been updated for MacOS Tahoe!**
-
 MouseHook is an open source macOS app written in Swift that allows you to hook a duplicate mouse cursor to your mouse's location and have it mimic the appearance of your mouse. This is especially useful for fixing the annoying issue where Parsec doesn't show the host mouse when using it as a monitor extender.
 
 Please note that MouseHook has only been developed and tested in my personal environment and I cannot provide any guarantees that it will work in other environments. Use at your own risk.