svgedit/test/svgutils_performance_test.js

/* eslint-env qunit */
/* globals $, svgedit */
/* eslint-disable no-var */
$(function () {
  // log function
  QUnit.log = function (details) {
    if (window.console && window.console.log) {
      window.console.log(details.result + ' :: ' + details.message);
    }
  };

  var currentLayer = document.getElementById('layer1');

  function mockCreateSVGElement (jsonMap) {
    var elem = document.createElementNS(svgedit.NS.SVG, jsonMap['element']);
    for (var attr in jsonMap['attr']) {
      elem.setAttribute(attr, jsonMap['attr'][attr]);
    }
    return elem;
  }
  function mockAddSvgElementFromJson (json) {
    var elem = mockCreateSVGElement(json);
    currentLayer.appendChild(elem);
    return elem;
  }

  // var svg = document.createElementNS(svgedit.NS.SVG, 'svg');
  var groupWithMatrixTransform = document.getElementById('svg_group_with_matrix_transform');
  var textWithMatrixTransform = document.getElementById('svg_text_with_matrix_transform');

  function fillDocumentByCloningElement (elem, count) {
    var elemId = elem.getAttribute('id') + '-';
    for (var index = 0; index < count; index++) {
      var clone = elem.cloneNode(true); // t: deep clone
      // Make sure you set a unique ID like a real document.
      clone.setAttribute('id', elemId + index);
      var parent = elem.parentNode;
      parent.appendChild(clone);
    }
  }

  module('svgedit.utilities_performance', {
    setup: function () {
    },
    teardown: function () {
    }
  });

  var mockPathActions = {
    resetOrientation: function (path) {
      if (path == null || path.nodeName !== 'path') { return false; }
      var tlist = svgedit.transformlist.getTransformList(path);
      var m = svgedit.math.transformListToTransform(tlist).matrix;
      tlist.clear();
      path.removeAttribute('transform');
      var segList = path.pathSegList;

      var len = segList.numberOfItems;
      var i; // , lastX, lastY;

      for (i = 0; i < len; ++i) {
        var seg = segList.getItem(i);
        var type = seg.pathSegType;
        if (type === 1) { continue; }
        var pts = [];
        $.each(['', 1, 2], function (j, n) {
          var x = seg['x' + n], y = seg['y' + n];
          if (x !== undefined && y !== undefined) {
            var pt = svgedit.math.transformPoint(x, y, m);
            pts.splice(pts.length, 0, pt.x, pt.y);
          }
        });
        // svgedit.path.replacePathSeg(type, i, pts, path);
      }

      // svgedit.utilities.reorientGrads(path, m);
    }
  };

  // //////////////////////////////////////////////////////////
  // Performance times with various browsers on Macbook 2011 8MB RAM OS X El Capitan 10.11.4
  //
  // To see 'Before Optimization' performance, making the following two edits.
  // 1. svgedit.utilities.getStrokedBBox - change if( elems.length === 1) to if( false && elems.length === 1)
  // 2. svgedit.utilities.getBBoxWithTransform - uncomment 'Old technique that was very slow'

  // Chrome
  // Before Optimization
  //	 Pass1 svgCanvas.getStrokedBBox total ms 4,218, ave ms 41.0,	 min/max 37 51
  //	 Pass2 svgCanvas.getStrokedBBox total ms 4,458, ave ms 43.3,	 min/max 32 63
  // Optimized Code
  //	 Pass1 svgCanvas.getStrokedBBox total ms 1,112, ave ms 10.8,	 min/max 9 20
  //	 Pass2 svgCanvas.getStrokedBBox total ms		34, ave ms	0.3,	 min/max 0 20

  // Firefox
  // Before Optimization
  //	 Pass1 svgCanvas.getStrokedBBox total ms 3,794, ave ms 36.8,	 min/max 33 48
  //	 Pass2 svgCanvas.getStrokedBBox total ms 4,049, ave ms 39.3,	 min/max 28 53
  // Optimized Code
  //	 Pass1 svgCanvas.getStrokedBBox total ms	 104, ave ms 1.0,	 min/max 0 23
  //	 Pass2 svgCanvas.getStrokedBBox total ms		71, ave ms 0.7,	 min/max 0 23

  // Safari
  // Before Optimization
  //	 Pass1 svgCanvas.getStrokedBBox total ms 4,840, ave ms 47.0,	 min/max 45 62
  //	 Pass2 svgCanvas.getStrokedBBox total ms 4,849, ave ms 47.1,	 min/max 34 62
  // Optimized Code
  //	 Pass1 svgCanvas.getStrokedBBox total ms		42, ave ms 0.4,	 min/max 0 23
  //	 Pass2 svgCanvas.getStrokedBBox total ms		17, ave ms 0.2,	 min/max 0 23

  asyncTest('Test svgCanvas.getStrokedBBox() performance with matrix transforms', function () {
    expect(2);
    var getStrokedBBox = svgedit.utilities.getStrokedBBox;
    var children = currentLayer.children;

    var index, count, child, start, delta, lastTime, now, ave,
      min = Number.MAX_VALUE,
      max = 0,
      total = 0;

    fillDocumentByCloningElement(groupWithMatrixTransform, 50);
    fillDocumentByCloningElement(textWithMatrixTransform, 50);

    // The first pass through all elements is slower.
    count = children.length;
    start = lastTime = now = Date.now();
    // Skip the first child which is the title.
    for (index = 1; index < count; index++) {
      child = children[index];
      /* var obj = */ getStrokedBBox([child], mockAddSvgElementFromJson, mockPathActions);
      now = Date.now(); delta = now - lastTime; lastTime = now;
      total += delta;
      min = Math.min(min, delta);
      max = Math.max(max, delta);
    }
    total = lastTime - start;
    ave = total / count;
    ok(ave < 20, 'svgedit.utilities.getStrokedBBox average execution time is less than 20 ms');
    console.log('Pass1 svgCanvas.getStrokedBBox total ms ' + total + ', ave ms ' + ave.toFixed(1) + ',	 min/max ' + min + ' ' + max);

    // The second pass is two to ten times faster.
    setTimeout(function () {
      count = children.length;

      start = lastTime = now = Date.now();
      // Skip the first child which is the title.
      for (index = 1; index < count; index++) {
        child = children[index];
        /* var obj = */ getStrokedBBox([child], mockAddSvgElementFromJson, mockPathActions);
        now = Date.now(); delta = now - lastTime; lastTime = now;
        total += delta;
        min = Math.min(min, delta);
        max = Math.max(max, delta);
      }

      total = lastTime - start;
      ave = total / count;
      ok(ave < 2, 'svgedit.utilities.getStrokedBBox average execution time is less than 1 ms');
      console.log('Pass2 svgCanvas.getStrokedBBox total ms ' + total + ', ave ms ' + ave.toFixed(1) + ',	 min/max ' + min + ' ' + max);

      QUnit.start();
    });
  });
});