It's more efficient passing one register-sized structure than 4
arguments or 4 pointers; working on intermediate values of 'int' size
is also more efficient in code size!
On raspberry pi pico w, this increased free flash space by +104 bytes.
It also increased the speed of my testing animation very slightly, from
187fps to 189fps when run 'unthrottled'
Jeff Epler
Dan Halbert
George Waters
Kattni Rembor