# Code coverage report for lib\interlace.js

## Statements: 100% (29 / 29) Branches: 100% (8 / 8) Functions: 100% (3 / 3) Lines: 100% (29 / 29) Ignored: none

All files » lib/ » interlace.js

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     exports.getImagePasses = function(width, height) {
      var images = [];
      var xLeftOver = width % 8;
      var yLeftOver = height % 8;
      var xRepeats = (width - xLeftOver) / 8;
      var yRepeats = (width - yLeftOver) / 8;
      for(var i = 0; i < imagePasses.length; i++) {
        var pass = imagePasses[i];
        var passWidth = xRepeats * pass.x.length;
        var passHeight = yRepeats * pass.y.length;
        for(var j = 0; j < pass.x.length; j++) {
          if (pass.x[j] < xLeftOver) {
            passWidth++;
          }
          else {
            break;
          }
        }
        for(j = 0; j < pass.y.length; j++) {
          if (pass.y[j] < yLeftOver) {
            passHeight++;
          }
          else {
            break;
          }
        }
        if (passWidth > 0 && passHeight > 0) {
          images.push({ width: passWidth, height: passHeight, index: i});
        }
      }
      return images;
    };

    exports.getInterlaceIterator = function(width, height) {
      return function(x, y, pass) {
        var outerXLeftOver = x % imagePasses[pass].x.length;
        var outerX = (((x - outerXLeftOver)/ imagePasses[pass].x.length) * 8) + imagePasses[pass].x[outerXLeftOver];
        var outerYLeftOver = y % imagePasses[pass].y.length;
        var outerY = (((y - outerYLeftOver) / imagePasses[pass].y.length) * 8) + imagePasses[pass].y[outerYLeftOver];
        return (outerX * 4) + (outerY * width * 4);
      };
    };

    // 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

    var 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]
      }
    ];