libcamera: Add transpose() function to size

Add a transpose() function to size that applies the
Transformation::Transpose operation in the size. This is useful when
handling orientation adjustments.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/geometry.cpp

@@ -203,6 +203,11 @@ protected:
 			return TestFail;
 		}
 
+		if (Size(200, 50).transpose() != Size(50, 200)) {
+			cout << "Size::transpose() test failed" << endl;
+			return TestFail;
+		}
+
 		/* Aspect ratio tests */
 		if (Size(0, 0).boundedToAspectRatio(Size(4, 3)) != Size(0, 0) ||
 		    Size(1920, 1440).boundedToAspectRatio(Size(16, 9)) != Size(1920, 1080) ||