The function computes the intersection of two regions.
The function computes the union of two regions.
The function updates the destination region from a union of the specified rectangle and the specified source region.
The function subtracts srb from sra and stores the results in dr_return.
The function calculates the difference between the union and intersection of two regions.
The function moves the specified region by a specified amount.
The function reduces the specified region by a specified amount. Positive values shrink the size of the region, and negative values expand the region.