var source;
var dX, dY, dW, dH, sW, sH;
function getVal(p, i) {
  if ((p.data[i] == 0x00) && (p.data[i + 1] == 0x00)) return 0;
  if ((p.data[i] == 0xFF) && (p.data[i + 1] == 0xFF)) return 1;
  if ((p.data[i] == 0x7F) && (p.data[i + 1] == 0x7F)) return 2;
  return 3;
}
function getVal_7color(p, i) {
  if (
    (p.data[i] == 0x00) && (p.data[i + 1] == 0x00) && (p.data[i + 2] == 0x00)
  ) return 0;
  if (
    (p.data[i] == 0xFF) && (p.data[i + 1] == 0xFF) && (p.data[i + 2] == 0xFF)
  ) return 1;
  if (
    (p.data[i] == 0x00) && (p.data[i + 1] == 0xFF) && (p.data[i + 2] == 0x00)
  ) return 2;
  if (
    (p.data[i] == 0x00) && (p.data[i + 1] == 0x00) && (p.data[i + 2] == 0xFF)
  ) return 3;
  if (
    (p.data[i] == 0xFF) && (p.data[i + 1] == 0x00) && (p.data[i + 2] == 0x00)
  ) return 4;
  if (
    (p.data[i] == 0xFF) && (p.data[i + 1] == 0xFF) && (p.data[i + 2] == 0x00)
  ) return 5;
  if (
    (p.data[i] == 0xFF) && (p.data[i + 1] == 0x80) && (p.data[i + 2] == 0x00)
  ) return 6;
  return 7;
}
function setVal(p, i, c) {
  p.data[i] = curPal[c][0];
  p.data[i + 1] = curPal[c][1];
  p.data[i + 2] = curPal[c][2];
  p.data[i + 3] = 255;
}
function addVal(c, r, g, b, k) {
  return [c[0] + (r * k) / 32, c[1] + (g * k) / 32, c[2] + (b * k) / 32];
}
function getErr(r, g, b, stdCol) {
  r -= stdCol[0];
  g -= stdCol[1];
  b -= stdCol[2];
  return r * r + g * g + b * b;
}
function getNear(r, g, b) {
  var ind = 0;
  var err = getErr(r, g, b, curPal[0]);
  for (var i = 1; i < curPal.length; i++) {
    var cur = getErr(r, g, b, curPal[i]);
    if (cur < err) {
      err = cur;
      ind = i;
    }
  }
  return ind;
}