js2png.php

<?php

/*
 * Author: Diego Perini <diego.perini@gmail.com>
 *
 * this is what I have in my build system to embed
 * the packed version of NWMatcher in a PNG file;
 * actually any data like JSON or XML can be
 * transported in compressed PNG files and
 * avoids HTTP compression requirements.
 *
 * Here is the javascript decoder:
 *
 *  // decodes and execute Javascript
 *  // code embedded in a PNG8 image
 *  function getDataPNG(g,k){
 *    var o;(o=new Image).src=g;
 *    o.onload=function(){
 *      var a,b,c,d,e,f='',
 *      x=o.width,y=o.height;
 *      c=document.createElement('canvas');
 *      e=c.getContext('2d');c.width=x;c.height=y;
 *      e.drawImage(o,0,0);d=e.getImageData(0,0,x,y).data;
 *      for(a=0;b=d[a];a+=4){f+=String.fromCharCode(b);}k(f)();
 *    };
 *  }
 *
 *  // usage:
 *  // forget about the toString.constructor
 *  // just pass the path to your local js/png file
 *  getDataPNG('dist/nwmatcher.png', toString.constructor);
 *
 */

$filename = 'dist/nwmatcher-pac.js';

if (file_exists($filename)) {

  $size = filesize($filename);

  $width = ceil(sqrt($size / 1));
  $height = $width - 1;

  $im = imagecreate($width, $height);

  $fs = fopen($filename, 'r');
  $data = fread($fs, $size);
  fclose($fs);

  $i = 0;
  $colors = array();

  for ($y = 0; $height > $y; ++$y) {
    for ($x = 0; $width > $x; ++$x) {
      if ($i < $size) {
        $byte = ord($data[$i]);
        if (!isset($colors[$byte])) {
          $colors[$byte] = imagecolorallocate($im, $byte, $byte, $byte);
        }
        $color = $colors[$byte];
        imagesetpixel($im, $x, $y, $color);
        ++$i;
      }
    }
  }

  header('Content-Type: image/png');
  imagepng($im, NULL, 9);
  imagedestroy($im);
}
?>