wip: fix grid line

Memola/Utilies/Extensions/Image++.swift

@@ -18,6 +18,59 @@ extension Image {
     }
 }
 
+#if os(macOS)
+extension NSImage {
+    func upsideDownMirrored() -> NSImage {
+        let degrees: CGFloat = 180
+        let sinDegrees = abs(sin(degrees * CGFloat.pi / 180.0))
+        let cosDegrees = abs(cos(degrees * CGFloat.pi / 180.0))
+        let newSize = CGSize(
+            width: size.height * sinDegrees + size.width * cosDegrees,
+            height: size.width * sinDegrees + size.height * cosDegrees
+        )
+
+        let imageBounds = NSRect(
+            x: (newSize.width - size.width) / 2,
+            y: (newSize.height - size.height) / 2,
+            width: size.width,
+            height: size.height
+        )
+
+        let otherTransform = NSAffineTransform()
+        otherTransform.translateX(by: newSize.width / 2, yBy: newSize.height / 2)
+        otherTransform.rotate(byDegrees: degrees)
+        otherTransform.translateX(by: -newSize.width / 2, yBy: -newSize.height / 2)
+
+        let rotatedImage = NSImage(size: newSize)
+        rotatedImage.lockFocus()
+        otherTransform.concat()
+        draw(in: imageBounds, from: CGRect.zero, operation: NSCompositingOperation.copy, fraction: 1.0)
+        rotatedImage.unlockFocus()
+
+        return rotatedImage
+    }
+
+    func flipped(flipHorizontally: Bool = false, flipVertically: Bool = false) -> NSImage {
+        let flippedImage = NSImage(size: size)
+
+        flippedImage.lockFocus()
+
+        NSGraphicsContext.current?.imageInterpolation = .high
+
+        let transform = NSAffineTransform()
+        transform.translateX(by: flipHorizontally ? size.width : 0, yBy: flipVertically ? size.height : 0)
+        transform.scaleX(by: flipHorizontally ? -1 : 1, yBy: flipVertically ? -1 : 1)
+        transform.concat()
+
+        draw(at: .zero, from: NSRect(origin: .zero, size: size), operation: .sourceOver, fraction: 1)
+
+        flippedImage.unlockFocus()
+
+        return flippedImage
+    }
+}
+#endif
+
 #if os(iOS)
 extension UIImage {
     func imageWithUpOrientation() -> UIImage? {