RenderScript set element of rs_allocation in pre-API 18

Question

From API 18 there is available function rsSetElementAt to set cell of rs_allocation. But how is this possible in APIs lower than 18?

Answer 1

It is not possible prior to API 18. You could sample Allocations which was set for your kernel then apply any changes to the output of your kernel. But, there was no API prior to API 18 to set a cell within an Allocation.