Espruino: store FontHaxorNarrow7x17 in storage and print single and double size without using any RAM for font and widths

using_font_from_storage.js

var s = require('Storage');

/* use this code only once to save font and widths in Storage
s.write('fHN7x17',atob("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"));
s.write('wHN7x17',atob("AwIGCAgICAMFBQYIAwYDBwcFBgYHBgYGBgYDAwYHBgcHBgYGBgYGBgYEBgYGBgYGBgYGBgYGBggGBgYEBwQGBwQGBgYGBgYHBgYGBgYGBgYGBgYGBgYGBgYGBgQCBAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABwAHCAYGBgAGBgYGAAYGBQYABgMGBgQABgYHBgAGBgYGBgYGBgYGBgYGBgYEBAYGBgYGBgYGAAYGBgYGBgYHBgYGBgYGBgYGBgYGBgYGBwcGBgYGBgYABgYGBgYGBg=="));
*/

Graphics.prototype.setFontHN7x17 = function() {
  var fHN7x17 = require('Storage').read('fHN7x17');
  var wHN7x17 = require('Storage').read('wHN7x17');
  this.setFontCustom(fHN7x17, 32, wHN7x17, 17);
};

Graphics.prototype.drawStringDbl = (txt,px,py,h)=>{
  var g2 = Graphics.createArrayBuffer(128,h,2,{msb:true});
  // set your custom font here if you need to
  g2.setFontHN7x17();
  var w = g2.stringWidth(txt);
  var c = (w+3)>>2;
  g2.drawString(txt);
  var img = {width:w*2,height:1,transparent:0,buffer:new ArrayBuffer(c)};
  var a = new Uint8Array(img.buffer);
  for (var y=0;y<h;y++) {
    a.set(new Uint8Array(g2.buffer,32*y,c));
    this.drawImage(img,px,py+y*2);
    this.drawImage(img,px,py+1+y*2);
  }
};

function ds(text){
  g.clear();
  g.setFontHN7x17();
  g.drawString(text,0,0);
  g.drawStringDbl(text,0,20,17);
  g.flip();
}

function start(){
  ds('01234äüöß');
  g.flip();
}

I2C1.setup({sda:NodeMCU.D1,scl:NodeMCU.D2});
var g = require("SSD1306").connect(I2C1,start);