[OSM-ja] CJK fallback fonts - testing needed

[Paul Norman]

Right now the main OpenStreetMap.org stylesheet uses Unifont as a 
fallback font to render Chinese, Japanese and Korean (CJK) characters, 
as well as any other characters not present in the DejaVu font. Unifont 
is mainly designed to support all characters, and is not designed to 
look good. 

I'm looking at Droid Sans Fallback, a free font developed for Android, 
and evaluating if it would be a better fallback font than Unifont. 
Because I don't read Chinese, Japanese or Korean, I could use help. 

I have prepared a demo at http://tile.paulnorman.ca/demo/fonts.html with 
three layers: conventional OSM.org, tiles without any fallback font, and 
tiles using Droid Fallback as a fallback font. 

What I would like is for people to look at the difference between the 
conventional OSM.org and Droid Fallback tiles and see which is easier to 
read for the CJK glyphs. The tiles without any fallback font can be used 
to find areas where DejaVu doesn't have glyphs and the fallback font is 
being used. 

Some examples

Japanese cities: http://tile.paulnorman.ca/demo/fonts.html#9/35.443/138.247

Japanese train stations:
http://tile.paulnorman.ca/demo/fonts.html#16/36.415/139.325

Korean cities: http://tile.paulnorman.ca/demo/fonts.html#9/37.25/127.22

Chinese tourist attraction:
http://tile.paulnorman.ca/demo/fonts.html#15/39.94/116.48

Please keep in mind that

- My server is not nearly as powerful as tile.osm.org, so renders slower 
  and has less cached data
- Only Asia is loaded on my server
- The data is a couple of days old and isn't being updated

I would like some feedback on if Unifont or Droid Sans Fallback looks 
better. Please keep in mind that I don't read the languages being rendered.