휠 반전 대체 이벤트를 줄 단위로 바꿔 원래 스크롤 속도 유지

픽셀 단위 대체 이벤트는 앱이 트랙패드처럼 처리해 한 칸당 이동 거리가 줄었다.
줄 단위로 만들고 원래 픽셀·소수점 이동량을 반전해 그대로 넣는다. 픽셀 이동량이
0인 휠 이벤트가 반전 없이 지나가던 문제도 고친다.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -2,6 +2,8 @@
 
 Razer Pro Click V2 (vendor 5426, product 209)의 휠 좌우 틸트를 각각 `Command+[` / `Command+]`로 보냅니다. 제공한 HID 보고서의 첫 바이트와 비트 마스크를 그대로 사용합니다.
 
+마우스 휠의 세로 스크롤 방향도 반전합니다. 트랙패드와 Magic Mouse처럼 제스처로 스크롤하는 장치와 가로 스크롤은 바꾸지 않습니다.
+
 ## 설치 / 업데이트
 
 ```sh

razer-tilt.swift

@@ -147,4 +147,61 @@ let accessTimer: Timer? = accessGranted() ? nil : {
         }
     }
 }()
+
+// Invert vertical mouse-wheel scrolling. Trackpads and Magic Mouse send gesture phases;
+// wheels do not, even when their high-resolution scrolling is marked continuous.
+var scrollTap: CFMachPort?
+var lastScrollKind = ""
+// Marks the replacement events this app posts so the tap lets them through untouched.
+let invertedScrollMarker: Int64 = 0x52544D31
+let scrollCallback: CGEventTapCallBack = { proxy, type, event, _ in
+    if type == .tapDisabledByTimeout || type == .tapDisabledByUserInput {
+        if let tap = scrollTap { CGEvent.tapEnable(tap: tap, enable: true) }
+        return Unmanaged.passUnretained(event)
+    }
+    guard type == .scrollWheel,
+          event.getIntegerValueField(.eventSourceUserData) != invertedScrollMarker
+    else { return Unmanaged.passUnretained(event) }
+    let phase = event.getIntegerValueField(.scrollWheelEventScrollPhase)
+    let momentum = event.getIntegerValueField(.scrollWheelEventMomentumPhase)
+    let isWheel = phase == 0 && momentum == 0
+    let kind = "continuous=\(event.getIntegerValueField(.scrollWheelEventIsContinuous)) wheel=\(isWheel)"
+    if kind != lastScrollKind {
+        log("Scroll events: \(kind)")
+        lastScrollKind = kind
+    }
+    let lineY = event.getIntegerValueField(.scrollWheelEventDeltaAxis1)
+    let pointY = event.getIntegerValueField(.scrollWheelEventPointDeltaAxis1)
+    let fixedY = event.getDoubleValueField(.scrollWheelEventFixedPtDeltaAxis1)
+    guard isWheel, lineY != 0 || pointY != 0 || fixedY != 0 else { return Unmanaged.passUnretained(event) }
+    let lineX = event.getIntegerValueField(.scrollWheelEventDeltaAxis2)
+    let pointX = event.getIntegerValueField(.scrollWheelEventPointDeltaAxis2)
+    let fixedX = event.getDoubleValueField(.scrollWheelEventFixedPtDeltaAxis2)
+    // Apps read the hardware data attached to the original event, so editing its delta
+    // fields has no visible effect. Post a fresh line-based event (like a real wheel, so
+    // apps keep their per-line scroll distance) carrying the original deltas, Y flipped.
+    guard let replacement = CGEvent(scrollWheelEvent2Source: nil, units: .line, wheelCount: 2,
+                                    wheel1: Int32(clamping: -lineY), wheel2: Int32(clamping: lineX), wheel3: 0)
+    else { return Unmanaged.passUnretained(event) }
+    replacement.setIntegerValueField(.scrollWheelEventPointDeltaAxis1, value: -pointY)
+    replacement.setIntegerValueField(.scrollWheelEventPointDeltaAxis2, value: pointX)
+    replacement.setDoubleValueField(.scrollWheelEventFixedPtDeltaAxis1, value: -fixedY)
+    replacement.setDoubleValueField(.scrollWheelEventFixedPtDeltaAxis2, value: fixedX)
+    replacement.location = event.location
+    replacement.flags = event.flags
+    replacement.setIntegerValueField(.eventSourceUserData, value: invertedScrollMarker)
+    replacement.tapPostEvent(proxy)
+    return nil
+}
+if accessGranted() {
+    scrollTap = CGEvent.tapCreate(tap: .cgSessionEventTap, place: .headInsertEventTap, options: .defaultTap,
+                                  eventsOfInterest: CGEventMask(1 << CGEventType.scrollWheel.rawValue),
+                                  callback: scrollCallback, userInfo: nil)
+    if let tap = scrollTap {
+        CFRunLoopAddSource(CFRunLoopGetCurrent(), CFMachPortCreateRunLoopSource(kCFAllocatorDefault, tap, 0), .commonModes)
+        log("Mouse wheel inversion running")
+    } else {
+        log("Mouse wheel inversion failed: could not create event tap")
+    }
+}
 CFRunLoopRun()