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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
// Adam 7
//   0 1 2 3 4 5 6 7
// 0 x 6 4 6 x 6 4 6
// 1 7 7 7 7 7 7 7 7
// 2 5 6 5 6 5 6 5 6
// 3 7 7 7 7 7 7 7 7
// 4 3 6 4 6 3 6 4 6
// 5 7 7 7 7 7 7 7 7
// 6 5 6 5 6 5 6 5 6
// 7 7 7 7 7 7 7 7 7
&nbsp;
let imagePasses = [
  {
    // pass 1 - 1px
    x: [0],
    y: [0],
  },
  {
    // pass 2 - 1px
    x: [4],
    y: [0],
  },
  {
    // pass 3 - 2px
    x: [0, 4],
    y: [4],
  },
  {
    // pass 4 - 4px
    x: [2, 6],
    y: [0, 4],
  },
  {
    // pass 5 - 8px
    x: [0, 2, 4, 6],
    y: [2, 6],
  },
  {
    // pass 6 - 16px
    x: [1, 3, 5, 7],
    y: [0, 2, 4, 6],
  },
  {
    // pass 7 - 32px
    x: [0, 1, 2, 3, 4, 5, 6, 7],
    y: [1, 3, 5, 7],
  },
];
&nbsp;
exports.getImagePasses = function (width, height) {
  let images = [];
  let xLeftOver = width % 8;
  let yLeftOver = height % 8;
  let xRepeats = (width - xLeftOver) / 8;
  let yRepeats = (height - yLeftOver) / 8;
  for (let i = 0; i &lt; imagePasses.length; i++) {
    let pass = imagePasses[i];
    let passWidth = xRepeats * pass.x.length;
    let passHeight = yRepeats * pass.y.length;
    for (let j = 0; j &lt; pass.x.length; j++) {
      if (pass.x[j] &lt; xLeftOver) {
        passWidth++;
      } else {
        break;
      }
    }
    for (let j = 0; j &lt; pass.y.length; j++) {
      if (pass.y[j] &lt; yLeftOver) {
        passHeight++;
      } else {
        break;
      }
    }
    if (passWidth &gt; 0 &amp;&amp; passHeight &gt; 0) {
      images.push({ width: passWidth, height: passHeight, index: i });
    }
  }
  return images;
};
&nbsp;
exports.getInterlaceIterator = function (width) {
  return function (x, y, pass) {
    let outerXLeftOver = x % imagePasses[pass].x.length;
    let outerX =
      ((x - outerXLeftOver) / imagePasses[pass].x.length) * 8 +
      imagePasses[pass].x[outerXLeftOver];
    let outerYLeftOver = y % imagePasses[pass].y.length;
    let outerY =
      ((y - outerYLeftOver) / imagePasses[pass].y.length) * 8 +
      imagePasses[pass].y[outerYLeftOver];
    return outerX * 4 + outerY * width * 4;
  };
};
&nbsp;</pre></td></tr></table></pre>

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