Function findByte

chapter05/5.8 - Draw Line/drawLine.js:5–8

(x, y, width)

  var pixel;

  var findByte = function(x, y, width) {
    var start = y * width / 8;
    return start + Math.floor(x / 8);
  };
  
  var findPixel = function(x) {
    return x % 8;