Someone should make an app which takes a screenshot of your laptop screen and sends it to your phone when you take a picture of your screen using the app. And immediately goes into crop mode. Not sure how to do it exactly.. It can rely on local wifi to send data with minimal lag, maybe have a QR code icon locked to the launcher, always visible on screen to detect it's your screen.

Please oh please someone make this! I don't know the j of java.