chrome/test/data/perf/frame_rate/head_animation.js

   1 // Copyright (c) 2011 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.
   4
   5 /**
   6  * @fileoverview  FrameRateTest harness variant for benchmarking
   7  * pages that contain content that is animated (e.g. canvas2d, webGL)
   8  *
   9  * How to instrument an animated web page for use with the frame rate test
  10  * harness:
  11  * 1. Include head.js followed by head_animation.js in the head of the test
  12  *    page.
  13  * 2. If the animation loop does not already use requestAnimationFrame,
  14  *    convert it.
  15  * 3. Replace calls to requestAnimationFrame with the __requestAnimationFrame
  16  *    function defined below
  17  * 4. If the test page needs to call requestAnimationFrame during an
  18  *    initialization phase that should not be measured by the test, then
  19  *    use __requestAnimationFrame_no_sampling
  20  */
  21
  22 // default gestures for animated content
  23 __gestures = {
  24   none: __gesture_library["stationary"]
  25 };
  26
  27 // Don't start benchmarking animated pages right away.
  28 // wait for initialization to complete.
  29 __initialized = false;
  30
  31 // Indicate to the test harness that the test page has its own
  32 // animation loop.
  33 __animation = true;
  34
  35 // Draw this many frames before starting test.
  36 // This is a delay to allow caches and other resources to spin-up to reach a
  37 // steady running state before benchmarking begins.
  38 var __warmup_frames = 10;
  39
  40 function __did_render_frame() {
  41   if (__warmup_frames > 0){
  42     __warmup_frames--;
  43     return;
  44   }
  45
  46   // Signal that page is ready to begin benchamarking
  47   __initialized = true;
  48
  49   if (__running) {
  50     __advance_gesture();
  51     __record_frame_time();
  52   }
  53 }
  54
  55 function __requestAnimationFrame(callback, element) {
  56   __did_render_frame();
  57   __raf(callback, element);
  58 }
  59
  60 function __requestAnimationFrame_no_sampling(callback, element) {
  61   __raf(callback, element);
  62 }
  63
  64