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fontnik

v0.7.7

Published

A library that delivers a range of glyphs rendered as SDFs (signed distance fields) in a protobuf.

Vulnerabilities

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Links

Git

Maintainers

mapbox-npm-01mapbox-npm-01mapbox-npm-02mapbox-npm-02mapbox-npm-07mapbox-npm-07mapbox-npm-03mapbox-npm-03mapbox-npm-04mapbox-npm-04mapbox-npm-09mapbox-npm-09mapbox-npm-05mapbox-npm-05mapbox-npm-06mapbox-npm-06mapbox-npm-08mapbox-npm-08mapbox-npm-advanced-actionsmapbox-npm-advanced-actionsmapbox-npm-cimapbox-npm-cimapbox-npmmapbox-npmmapbox-adminmapbox-adminmapbox-machine-usermapbox-machine-usermbx-npm-ci-stagingmbx-npm-ci-stagingmbx-npm-ci-productionmbx-npm-ci-productionmbx-npm-01-productionmbx-npm-01-productionmbx-npm-02-productionmbx-npm-02-productionmbx-npm-03-productionmbx-npm-03-productionmbx-npm-04-productionmbx-npm-04-productionmbx-npm-05-productionmbx-npm-05-productionmbx-npm-06-productionmbx-npm-06-productionmbx-npm-07-productionmbx-npm-07-productionmbx-npm-08-productionmbx-npm-08-productionmbx-npm-09-productionmbx-npm-09-productionmbx-npm-02-stagingmbx-npm-02-stagingmbx-npm-advanced-actions-stagingmbx-npm-advanced-actions-stagingmbx-npm-advanced-actions-productionmbx-npm-advanced-actions-production

Keywords

fonttextglyphfreetypesdf

Readme

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 in 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.

See also TinySDF, which is a faster but less precise approach to generating SDFs for fonts.

API

Installing

Prebuilt binaries are included in the npm package for:

  • macOS arm64 (darwin-arm64)
  • macOS x64 (darwin-x64)
  • Linux x64 (linux-x64)
  • Linux arm64 (linux-arm64)
npm install

On other platforms, or when no matching prebuild exists, npm install compiles from source via CMake (see below). Node.js 20 or later is required.

Building from source

Install system dependencies:

macOS

brew install cmake ninja boost zlib

Linux (Debian/Ubuntu)

sudo apt-get install cmake ninja-build zlib1g-dev libboost-dev

Then build:

npm run rebuild

N-API headers (node-addon-api, node-api-headers), protozero, and FreeType are fetched automatically by CMake at configure time.

Local testing

npm test

After changing C++ sources in src/, rebuild the native module:

make

See the Makefile for coverage, sanitize, tidy, format, and Linux Docker testing (make test-linux).

Linux builds via Docker

To mirror CI on a Mac (or any host with Docker), build and test inside Ubuntu 22.04 containers matching GHA:

./scripts/docker-linux-test.sh              # linux-x64 + linux-arm64, Release
./scripts/docker-linux-test.sh x64 Debug    # single arch / build type

Release builds write prebuilds/linux-<arch>/fontnik.node directly (same as local npm run rebuild).

Or make test-linux / make test-linux-x64. Use --rebuild-image after changing scripts/docker/Dockerfile.

Release

See DEV.md.

Background reading