Espruino/scripts/build_vector_font.js

#!/usr/bin/nodejs
/* This is a super hacky bit of code that takes a specially formatted SVG file
and creates an Espruino vector font from it.

npm install extract-svg-path

*/

// SVG contents from http://forum.espruino.com/conversations/347368/#comment15288563
var polyImg = [
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];

var charData = [];
var firstChar=255, lastChar=0;
var maxPolyLen = 0;
polyImg.forEach(function(polyb64) {
  let buf = new Buffer(polyb64, 'base64');
  var minx=1000,maxx=-1,miny=1000,maxy=-1;
  var poly = [];
  for (var i=0;i<buf.length;i+=2) {
    var x = buf.readUInt8(i);
    var y = buf.readUInt8(i+1);
    if (x<minx) minx=x;
    if (y<miny) miny=y;
    if (x>maxx) maxx=x;
    if (y>maxy) maxy=y;
    poly.push((x&15)+((y&15)<<4));
  }
  if (poly.length > maxPolyLen)
    maxPolyLen = poly.length;
  var cx = minx>>4;
  var cy = miny>>4;
  var dx = maxx>>4;
  var dy = maxy>>4;
  if (cx!=dx || cy!=dy) console.log("Char straddles boundary!");
  var charNumber = cx + (cy*16);
  if (charNumber > lastChar) lastChar = charNumber;
  if (charNumber < firstChar) firstChar = charNumber;

  if (charData[charNumber]===undefined)
    charData[charNumber] = [];
  charData[charNumber].push(poly);
});


var vector_font_c = `/*
 * This file is part of Espruino, a JavaScript interpreter for Microcontrollers
 *
 * Copyright (C) 2020 Gordon Williams <gw@pur3.co.uk>
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * ----------------------------------------------------------------------------
 * Machine geneated vector font header (by build_vector_font.sh)
 * ----------------------------------------------------------------------------
 */

#ifndef NO_VECTOR_FONT
#include "graphics.h"

const uint8_t vfFirstChar = ${firstChar};
#define VF_END_OF_POLY 0xFE
#define VF_END_OF_CHAR 0xFF
static const uint8_t vfPolys[] IN_FLASH_MEMORY = {
`;
for (var c=firstChar;c<=lastChar;c++) {
  var char = charData[c];
  if (!char) continue;
  vector_font_c += `// ${c}\n`;
  char.forEach((poly,n) => {
    var last = n == char.length-1;
    vector_font_c += poly.join(",")+
      ","+(last?"VF_END_OF_CHAR":"VF_END_OF_POLY")+",\n";
  });
  if (char.length == 0)
    vector_font_c += "VF_END_OF_CHAR,\n";
}
vector_font_c += `};

int vfGetCharOffset(char ch) {
  if (ch<vfFirstChar) return -1;
  if (ch==vfFirstChar) return 0;
  int charCounter = ((uint8_t)ch) - vfFirstChar;
  for (int p=0;p < sizeof(vfPolys);p++) {
    if (vfPolys[p] == VF_END_OF_CHAR) {
      charCounter--;
      if (charCounter==0)
        return p+1;
    }
  }
  return -1; // we went past the end
}

// returns the width of a character
unsigned int graphicsVectorCharWidth(JsGraphics *gfx, unsigned int size, char ch) {
  int p = vfGetCharOffset(ch);
  if (p<0) return size/2;
  int w = 0;
  while (vfPolys[p]!=VF_END_OF_CHAR) {
    if (vfPolys[p]!=VF_END_OF_POLY) {
      uint8_t vertex = vfPolys[p];
      int vx = vertex&15;
      if (vx>w) w=vx;
    }
    p++;
  }
  return ((w+1)*size+7)>>4;
}

// prints character, returns width
unsigned int graphicsFillVectorChar(JsGraphics *gfx, int x1, int y1, int size, char ch) {
  int p = vfGetCharOffset(ch);
  if (p<0) return size/2;
  short poly[${maxPolyLen*2}];
  int polyLen = 0;
  int w = 0;
  while (vfPolys[p]!=VF_END_OF_CHAR) {
    if (vfPolys[p]==VF_END_OF_POLY) {
      graphicsFillPoly(gfx, polyLen, poly);
      polyLen = 0;
    } else {
      uint8_t vertex = vfPolys[p];
      int vx = vertex&15;
      int vy = vertex>>4;
      if (vx>w) w=vx;
      poly[polyLen*2  ] = (short)(x1 + ((vx*size+8)>>4));
      poly[polyLen*2+1] = (short)(y1 + ((vy*size+8)>>4));
      polyLen++;
    }
    p++;
  }
  graphicsFillPoly(gfx, polyLen, poly);
  return ((w+1)*size+7)>>4;
}

#endif
`;

var vector_font_h = `/*
 * This file is part of Espruino, a JavaScript interpreter for Microcontrollers
 *
 * Copyright (C) 2020 Gordon Williams <gw@pur3.co.uk>
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * ----------------------------------------------------------------------------
 * Machine geneated vector font header (by build_vector_font.sh)
 * ----------------------------------------------------------------------------
 */

#ifndef NO_VECTOR_FONT
#include "graphics.h"

// returns the width of a character
unsigned int graphicsVectorCharWidth(JsGraphics *gfx, unsigned int size, char ch);
// prints character, returns width
unsigned int graphicsFillVectorChar(JsGraphics *gfx, int x1, int y1, int size, char ch);
#endif
`;


require("fs").writeFileSync(__dirname + "/../libs/graphics/vector_font.c", vector_font_c);
require("fs").writeFileSync(__dirname + "/../libs/graphics/vector_font.h", vector_font_h);