Scale tiles for better legibility (like fake zoom, but for all zoom factors)

On high resolution displays (e.g. Moto G, 329ppi) the street names are way too 
small to be readable without a magnifying glass.

The optimal solution would provide a scale factor (integer: 1x, 2x, 3x) which 
scales the map tiles up transparently to a bigger physical size while keeping 
all other metrics as is (pixel-to-coord, coord-to-pixel).

{IMHO} you don't have to be visually impaired to benefit from this change. From 
this perspective one could always scale the tile images to dip (device 
independent pixels) with no option to change this behaviour.{/IMHO}

(I'm using osmdroid 4.1 on Android 4.0.4 and 4.4)

See also 
http://stackoverflow.com/questions/7240568/osmdroid-display-tiles-bigger

Original issue reported on code.google.com by heinrich...@gmail.com on 12 Feb 2014 at 9:20

Merged into: #523

otavio17 / osmdroid

Scale tiles for better legibility (like fake zoom, but for all zoom factors) #525