otsaloma / cartago-styles Goto Github PK

When working on native Mapbox GL client, I observed that labels disappear at higher zooms at Cartago. Later I found the same when working on OSM Scout Server. Turned out that some icons were missing in the sprite leading to such bug in Mapbox GL Native. While this bug/feature has been fixed in 1.2.0 version of Mapbox GL Qt bindings (can't use them yet due to other issues), it highlights that some icons are missing. For now, I fixed it in OSM Scout Server by limiting POI ranks ( https://github.com/rinigus/osmscout-server/blob/master/styles/mapboxgl/styles/osmbright.json#L3735 ). But, I guess, we better find what's missing.

When you create a new POI object on a map within the application, the default fonts are used by Mapbox GL, unless you specify them. If the application is developed against only one provider, we can find which font to use and specify it in the app. However, issues appear as soon as you start developing against multiple basemaps and allow users to swap them. To avoid the issues, we need to either add default fonts (https://www.mapbox.com/mapbox-gl-js/style-spec/#layout-symbol-text-font, ["Open Sans Regular","Arial Unicode MS Regular"]) or let the server to supply some alternative. In OSM Scout Server, I am providing Open Sans Regular and backing it with Noto fonts. How to do it exactly with the tileserver, I don't know. In particular, I don't know whether requested URL that comes in form

... Open Sans Regular,Arial Unicode MS Regular ...

is split into parts and whether tileserver searches for each of the fonts separately. From that it will depend on how to add the default font to the server.

I have written some scripts that allow to merge Noto fonts into a single font (regular + CJK). That would simplify writing of the styles since only one font needs to be mentioned. The scripts are available at https://github.com/rinigus/mapbox-gl-fonts . At present, they populate SQLite database. However, we can rewrite them for dumping glyphs into pbf files, as it is done usually. For me, SQLite was better due to simplicity of its upload/download and use.