tools/perf/page_sets/tough_scrolling_while_zoomed_in_cases.py

   1 # Copyright 2015 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 from page_sets import diagonal_scrolling_supported_shared_state
   5
   6 from telemetry.page import page as page_module
   7 from telemetry import story
   8
   9
  10 class ToughScrollingWhileZoomedInCasesPage(page_module.Page):
  11
  12   def __init__(self, url, page_set):
  13     super(ToughScrollingWhileZoomedInCasesPage, self).__init__(
  14         url=url,
  15         page_set=page_set,
  16         shared_page_state_class=(
  17             diagonal_scrolling_supported_shared_state.
  18             DiagonalScrollingSupportedSharedState))
  19
  20   def RunPageInteractions(self, action_runner):
  21     # First, zoom into the page
  22     action_runner.PinchPage(
  23         scale_factor=20.0,
  24         speed_in_pixels_per_second=10000)
  25     # 20.0 was chosen because at the time it was close to the maximum.
  26     # The more zoomed in, the more noticable the tile rasterization.
  27     #
  28     # 10,000 was chosen to complete this pre-step quickly.
  29
  30     # Then start measurements
  31     with action_runner.CreateGestureInteraction('ScrollAction'):
  32       # And begin the diagonal scroll
  33       action_runner.ScrollPage(
  34           direction='downright',
  35           # 10,000 was chosen because it is fast enough to completely stress the
  36           # rasterization (on a Nexus 5) without saturating results.
  37           speed_in_pixels_per_second=10000)
  38
  39
  40 class ToughScrollingWhileZoomedInCasesPageSet(story.StorySet):
  41   """
  42   Description: A collection of difficult scrolling tests
  43   """
  44
  45   def __init__(self):
  46     super(ToughScrollingWhileZoomedInCasesPageSet, self).__init__(
  47         archive_data_file='data/tough_pinch_zoom_cases.json',
  48         cloud_storage_bucket=story.PARTNER_BUCKET)
  49
  50     # The following urls were chosen because they tend to have >15%
  51     # mean_pixels_approximated at this scrolling speed.
  52     urls_list = [
  53         'file://tough_scrolling_cases/background_fixed.html',
  54         'file://tough_scrolling_cases/fixed_nonstacking.html',
  55         'file://tough_scrolling_cases/iframe_scrolls.html',
  56         'file://tough_scrolling_cases/wheel_div_prevdefault.html'
  57     ]
  58
  59     for url in urls_list:
  60       self.AddStory(ToughScrollingWhileZoomedInCasesPage(url, self))