[OSM-dev] Label font scaling

[Lynn W. Deffenbaugh (Mr)]

I'm running my own Tile Server (mod_tile/renderd created from packages 
as described at 
http://switch2osm.org/serving-tiles/building-a-tile-server-from-packages/ and 
would like to serve up a new set of tiles with larger font sizes for 
higher resolution displays.

I read 
https://help.openstreetmap.org/questions/8467/font-size-and-adding-scale-to-map 
which describes the textsymbolizer element in osm.xml, to whit:

> <https://help.openstreetmap.org/vote/8472/up/>
> 3
> <https://help.openstreetmap.org/vote/8472/down/>
> 	
>
> The font size comes from the style file /osm.xml/. This includes 
> several lines on the form "/|<textsymbolizer name="name" 
> fontset_name="bold-fonts" size="11"/>|/". You can edit the /size/ 
> parameter in the wanted areas to generate a new style with other font 
> sizes.
>

But there's a TON of textsymbolizer's that would need to be edited. 
Cloudmade's tile servers support an embedded doubler in their tile URL 
as described at http://developers.cloudmade.com/projects/tiles/documents

> To get double resolution tiles use *@2x* suffix: 997 at 2x - this will 
> improve map look for iPhone 4, Motorola Milestone, etc.

Does anyone know how they do that?  Is there a way to replace the 
textsymbolizer element size attributes with a variable (say Size11, 
Size8, SizeN) so that I can simply clone the style and edit all of the 
sizes in a single place?  Then I could do a 1.5, 2, 4, or whatever by 
simply editing the sizes where the variables are declared instead of 
every single textsymbolizer element.

Any/all help would be appreciated to accomplish label font scaling in 
the rendering chain with minimal manual editing work for each scale that 
I support.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

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