Default CGAffineTransforms in macOS

output.txt

# Edited to align columns

GraphicsContext               CGAffineTransform(a: 1.0, b: 0.0, c: 0.0, d: 1.0, tx: 0.0, ty: 0.0)
GraphicsContext.withCGContext CGAffineTransform(a: 1.0, b: 0.0, c: 0.0, d: 1.0, tx: 0.0, ty: 0.0)
FlippedView                   CGAffineTransform(a: 2.0, b: 0.0, c: 0.0, d: -2.0, tx: 0.0, ty: 1280.0)
NormalView                    CGAffineTransform(a: 2.0, b: 0.0, c: 0.0, d: 2.0, tx: 0.0, ty: 0.0)

TransformTest.swift

class NormalView: NSView {
    override func draw(_ dirtyRect: NSRect) {
        print("NormalView", NSGraphicsContext.current!.cgContext.ctm)
    }
}

struct NormalViewRepresentable: NSViewRepresentable {
    func makeNSView(context: Context) -> NormalView {
        NormalView()
    }

    func updateNSView(_ nsView: NormalView, context: Context) {
    }
}

class FlippedView: NSView {
    override var isFlipped: Bool {
        true
    }

    override func draw(_ dirtyRect: NSRect) {
        print("FlippedView", NSGraphicsContext.current!.cgContext.ctm)
    }
}

struct FlippedViewRepresentable: NSViewRepresentable {
    func makeNSView(context: Context) -> FlippedView {
        FlippedView()
    }

    func updateNSView(_ nsView: FlippedView, context: Context) {
    }
}

struct TransformTest: View {
    var body: some View {
        ZStack {
            Canvas { context, size in
                print("GraphicsContext", context.transform)
                context.withCGContext { cgContext in
                    print("GraphicsContext.withCGContext", cgContext.ctm)
                }
            }

            NormalViewRepresentable()
            FlippedViewRepresentable()
        }
    }
}