npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

bower_components/web-animations-js/test/perf/perf.js

-/**
- * Copyright 2013 Google Inc. All Rights Reserved.
- * 
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *   http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-(function(){
-'use strict';
-
-var disregardFramesCount = 10;
-var framesPerTimeReading = 10;
-var maxTimeReadings = 60;
-var maxFPSReadings = 31;
-
-var frameCount = 0;
-var timeReadings = [];
-var fpsReadings = [];
-var onCompleteHandler;
-var outputElement;
-var running = false;
-var visibilityLost = false;
-
-var getTime = (typeof window.performance === 'object' &&
-    typeof window.performance.now === 'function') ?
-    function() { return window.performance.now(); } :
-    function() { return Date.now(); };
-
-var raf = window.requestAnimationFrame ||
-    window.webkitRequestAnimationFrame ||
-    window.mozRequestAnimationFrame ||
-    function(callback) { setTimeout(callback, 1000 / 60); };
-
-var visibilityChangeEvent = null;
-var hidden = null;
-if (typeof document.hidden !== 'undefined') {
-  visibilityChangeEvent = 'visibilitychange';
-  hidden = 'hidden';
-} else if (typeof document.mozHidden !== 'undefined') {
-  visibilityChangeEvent = 'mozvisibilitychange';
-  hidden = 'mozHidden';
-} else if (typeof document.msHidden !== 'undefined') {
-  visibilityChangeEvent = 'msvisibilitychange';
-  hidden = 'msHidden';
-} else if (typeof document.webkitHidden !== 'undefined') {
-  visibilityChangeEvent = 'webkitvisibilitychange';
-  hidden = 'webkitHidden';
-}
-if (visibilityChangeEvent) {
-  document.addEventListener(visibilityChangeEvent, function() {
-    if (running && document[hidden]) {
-      visibilityLost = true;
-    }
-  });
-}
-
-var randomSeed = 3384413;
-function random() {
-    var temp = randomSeed;
-    // Robert Jenkins' 32 bit integer hash function.
-    temp = ((temp + 0x7ed55d16) + (temp << 12))  & 0xffffffff;
-    temp = ((temp ^ 0xc761c23c) ^ (temp >>> 19)) & 0xffffffff;
-    temp = ((temp + 0x165667b1) + (temp << 5))   & 0xffffffff;
-    temp = ((temp + 0xd3a2646c) ^ (temp << 9))   & 0xffffffff;
-    temp = ((temp + 0xfd7046c5) + (temp << 3))   & 0xffffffff;
-    temp = ((temp ^ 0xb55a4f09) ^ (temp >>> 16)) & 0xffffffff;
-    randomSeed = temp;
-    return (randomSeed & 0xfffffff) / 0x10000000;
-}
-
-function disregardFrames() {
-  raf((frameCount++ < disregardFramesCount) ? disregardFrames : trackFrameRate);
-}
-
-function trackFrameRate()
-{
-  frameCount++;
-  if (frameCount % framesPerTimeReading === 0) {
-    timeReadings.unshift(getTime());
-    if (timeReadings.length > maxTimeReadings) {
-      timeReadings.pop();
-    }
-    if (timeReadings.length > 1) {
-      var fpsReading = 1000 * (timeReadings.length - 1) * framesPerTimeReading /
-          (timeReadings[0] - timeReadings[timeReadings.length - 1]);
-      fpsReadings.push(fpsReading);
-      output(fpsReading + ' FPS\n');
-      if (fpsReadings.length >= maxFPSReadings) {
-        outputSummary();
-        running = false;
-        if (typeof onCompleteHandler === 'function') {
-          onCompleteHandler();
-        }
-        return;
-      }
-    }
-  }
-  raf(trackFrameRate);
-}
-
-function output(text) {
-  outputElement.value += text;
-}
-
-function outputSummary() {
-  if (visibilityLost) {
-    output('Warning: Document lost visibility during test, ' +
-        'results may be inaccurate.\n');
-  }
-  var total = 0;
-  fpsReadings.forEach(function(fpsReading) { total += fpsReading; });
-  var average = total / maxFPSReadings;
-  output('Average: ' + average + ' FPS\n');
-  var temp = 0;
-  fpsReadings.forEach(function(fpsReading) {
-    temp += (fpsReading - average) * (fpsReading - average);
-  });
-  output('Stddev: ' + Math.sqrt(temp / fpsReadings.length) + ' FPS\n');
-  fpsReadings.sort();
-  output('Min: ' + fpsReadings[0] + ' FPS\n');
-  output('Max: ' + fpsReadings[fpsReadings.length - 1] + ' FPS\n');
-  var median = fpsReadings[fpsReadings.length >> 1];
-  if (fpsReadings.length % 2 !== 0) {
-    median = (median + fpsReadings[(fpsReadings.length >> 1) + 1]) / 2;
-  }
-  output('Median: ' + median + ' FPS\n');
-}
-
-var start = function() {
-  outputElement = document.createElement('textarea');
-  outputElement.setAttribute('rows', maxFPSReadings + 6);
-  outputElement.setAttribute('cols', 32);
-  document.body.appendChild(outputElement);
-
-  output('Disregarding initial ' + disregardFramesCount + ' frames.\n')
-  raf(disregardFrames);
-
-  running = true;
-};
-
-window.Perf = {
-  set oncomplete(callback) {
-    onCompleteHandler = callback;
-  },
-  start: start,
-  random: random,
-};
-
-})();