1. A method for deriving a physical memory address for a transaction associated with a footprint on a display screen, the method comprising: mapping the footprint to a group of contiguous physical memory locations in a memory system; determining an anchor physical memory address from a first transaction associated with the footprint, wherein the anchor physical memory address corresponds to an anchor point in the group of contiguous physical memory locations; determining a second transaction that is also associated with the footprint; determining a set of least significant bits (LSBs) associated with the second transaction; and combining the anchor physical memory address with the set of LSBs associated with the second transaction to generate a second physical memory address for the second transaction.