Hello, as for being limited of phone storage I'm continuously looking for ways to reduce overall maps sizes. Because most of maps I use already contain hard-rendered relief shading this obviously decreases the map compressibility. Without wanting trade off the relief shading I wonder if removing the relief from all maps and rendering it from another source would bring a space saving without a significant performance loss.
There's 2 ways how to realize this: either as a standalone relief only map displayed always on top as opaque layer or fully rendered from hgt files (if present) like in OruxMaps. The latter method has it's clear advantage in fully eliminating the relief from saved maps thus size reduction but might have an impact on performance.
I'm curious how hard is to implement one of the ways and how demanding on CPU utilization/battery life would it be.