1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 if (window.PerfTestHelper) {
10 window.PerfTestHelper = {};
12 var randomSeed = 3384413;
13 var mask = 0xffffffff;
14 window.PerfTestHelper.random = function() {
15 var temp = randomSeed;
16 // Robert Jenkins' 32 bit integer hash function.
17 temp = ((temp + 0x7ed55d16) + (temp << 12)) & mask;
18 temp = ((temp ^ 0xc761c23c) ^ (temp >>> 19)) & mask;
19 temp = ((temp + 0x165667b1) + (temp << 5)) & mask;
20 temp = ((temp + 0xd3a2646c) ^ (temp << 9)) & mask;
21 temp = ((temp + 0xfd7046c5) + (temp << 3)) & mask;
22 temp = ((temp ^ 0xb55a4f09) ^ (temp >>> 16)) & mask;
24 return (randomSeed & 0xfffffff) / 0x10000000;
27 window.PerfTestHelper.getParameter = function(parameter) {
28 var match = new RegExp(parameter + '=([^&]*)').exec(window.location.search);
35 window.PerfTestHelper.getN = function(defaultN) {
36 var match = PerfTestHelper.getParameter('N');
38 var n = Number(match);
40 throw 'Invalid N value: ' + match;
44 if (typeof defaultN === 'undefined') {
45 throw 'Default N value required';
50 window.PerfTestHelper.signalReady = function() {
51 requestAnimationFrame(function() {
52 // FIXME: We must wait at least two frames before
53 // measuring to allow the GC to clean up the
55 requestAnimationFrame(function() {
56 window.measurementReady = true;