Architecture & Design

Architecture & Design

System Architecture

Sources/
├── ctdoshotApp/
│   └── App.swift            # SwiftUI @main entry point
└── ctdoshotCore/
    ├── AppDelegate.swift    # App lifecycle & status bar menu manager
    ├── CaptureEngine.swift  # ScreenCaptureKit orchestrator
    ├── DrawingCanvasView.swift # SwiftUI Canvas & CoreGraphics rendering
    ├── OCRManager.swift     # Apple Vision VNRecognizeTextRequest
    ├── HotkeyManager.swift  # Carbon RegisterEventHotKey global shortcuts
    └── HistoryManager.swift # JSON history persistence

Rendering Pipeline

1. Interactive Screen Overlay: Rendered using SwiftUI Canvas for smooth 60fps tracking.
2. Composite Export: Rendered using Core Graphics (CGContext) on NSBitmapImageRep to preserve exact native Retina resolution.