kdu_resolution::propagate_roi

This function returns false if there is no need to propagate ROI mask information from this resolution level into its derived subbands. The function always returns false if invoked on an input or interchange codestream). For output codestreams (those created using the first form of the overloaded kdu_codestream::create function), the function's return value depends on the Rlevels attribute of the relevant roi_params parameter object set up during content creation.