[polymer] import all elements

pkg/polymer/lib/elements/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,
+};
+
+})();