node-fontnik
A library that delivers a range of glyphs rendered as SDFs (signed distance fields) in a protocol buffer. We use these encoded glyphs as the basic blocks of font rendering in Mapbox GL. SDF encoding is superior to traditional fonts for our usecase terms of scaling, rotation, and quickly deriving halos - WebGL doesn't have built-in font rendering, so the decision is between vectorization, which tends to be slow, and SDF generation.
The approach this library takes is to parse and rasterize the font with Freetype (hence the C++ requirement), and then generate a distance field from that rasterized image.
API
Installing
By default, installs binaries. On these platforms no external dependencies are needed.
- 64 bit OS X or 64 bit Linux
- Node.js v0.10.x, v0.12.x, v4.x or v5.x
Just run:
npm install
However, other platforms will fall back to a source compile: see building from source for details.
Building from source
Make sure you have boost, freetype, and protobuf installed. With Homebrew, you can
type brew install boost --c++11 freetype protobuf --c++11. The Makefile uses pkg-config to find these
libraries and links dynamically to them, so make sure that pkg-config can find
them.
npm install --build-from-source