Subtracts s from the size and returns a reference to this size. Divides both the width and height by c and returns a reference to the size. Note that the result is truncated. Using a reference makes it possible to directly manipulate the height. Using a reference makes it possible to directly manipulate the width.
Multiplies s by c and returns the result.
Multiplies s by c and returns the result. Multiplies s by c and returns the result. Note that the result is truncated.