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* #3818: remove further GC blocking referencesBananeweizen2014-05-171-3/+6
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* refactoring: reduce mapsforge memory usageBananeweizen2013-12-181-0/+92
This puts scale and position into one overlay, instead of using 2 overlays. That reduces memory usage by 2 times a full screen bitmap due to double buffering in mapsforge. The only downside is that scale and position now have to be drawn at the same depth-level (below or on top of the caches), but they were both on top previously anyway.