Overwrites options.canvas with default peramiters

[iceblu3710]

In vtext.js#L192-L201 any passed information in the canvas is overwritten.

I need to pass my specific font information before calling vectorizeText as I work in called mm instead of px. so It would be nice to have the function check if a context was given and use that explicitly, else create the default canvas.

if(typeof document !== 'undefined') {
  defaultCanvas = document.createElement('canvas')
  defaultCanvas.width = 8192
  defaultCanvas.height = 1024
  defaultCanvas.id = "default"
  defaultContext = defaultCanvas.getContext("2d")
}




function vectorizeText(str, canvas, context, options) {
  if(canvas.id == "default") {
    var size = options.size || 64
    context.font = [
      options.fontStyle,
      options.fontVariant,
      options.fontWeight,
      size + "px",
      options.font
    ].filter(function(d) {return d}).join(" ")
    context.textAlign = "start"
    context.textBaseline = "alphabetic"
    context.direction = "ltr"
  }

  var pixels = getPixels(canvas, context, str, size)

  return processPixels(pixels, options, size)
}