node-bitmap と node-pngjs で適当に変換するやつ(未完成)

gistfile1.txt

var fs = require('fs');
var Bitmap = require('node-bitmap');
var PNG = require('pngjs').PNG;

var filepath = "/Users/shimo/tmp/1.bmp";
var stat = fs.statSync(filepath);
var buf = new Buffer(stat.size);
var fd = fs.openSync("/Users/shimo/tmp/1.bmp", "r");
fs.readSync(fd, buf, 0, stat.size);

var bmp = new Bitmap(buf);
bmp.init();
var bitmapArray = bmp.getData();
console.log(bitmapArray.length);

var png = new PNG({ width: 1280, height: 720, filterType: -1 });
var dst = fs.createWriteStream('out.png');

for (var y = 0; y < png.height; y++) {
  for (var x = 0; x < png.width; x++) {
    var idx = (png.width * y + x) << 2;
    png.data[idx] = 0;
    png.data[idx + 1] = 0;
    png.data[idx + 2] = 0;
    png.data[idx + 3] = 0xff;
  }
}

png.pack().pipe(dst);