skia-canvas/lib/classes/typography.js

A multi-threaded, GPU-accelerated, Canvas API for Node

//
// Font management & metrics
//

"use strict"

const {RustClass, readOnly, signature, inspect, REPR} = require('./neon')

class FontLibrary extends RustClass {
  constructor(){
    super(FontLibrary)
  }

  get families(){ return this.prop('families') }

  has(familyName){ return this.ƒ('has', familyName) }

  family(name){ return this.ƒ('family', name) }

  use(...args){
    let sig = signature(args)
    if (sig=='o'){
      let results = {}
      for (let [alias, paths] of Object.entries(args.shift())){
        results[alias] = this.ƒ("addFamily", alias, [paths].flat())
      }
      return results
    }else if (sig.match(/^s?[as]$/)){
      let fonts = [args.pop()].flat()
      let alias = args.shift()
      return this.ƒ("addFamily", alias, fonts)
    }else{
      throw new Error("Expected an array of file paths or an object mapping family names to font files")
    }
  }

  reset(){ return this.ƒ('reset') }
}

class TextMetrics{
  constructor(metrics){
    for (let k in metrics) readOnly(this, k, metrics[k])
  }
}


module.exports = {FontLibrary:new FontLibrary(), TextMetrics}