| # Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| from telemetry.page import page_measurement |
| |
| |
| class ImageDecoding(page_measurement.PageMeasurement): |
| def CustomizeBrowserOptions(self, options): |
| options.AppendExtraBrowserArgs('--enable-gpu-benchmarking') |
| |
| def WillNavigateToPage(self, page, tab): |
| tab.ExecuteJavaScript(""" |
| if (window.chrome && |
| chrome.gpuBenchmarking && |
| chrome.gpuBenchmarking.clearImageCache) { |
| chrome.gpuBenchmarking.clearImageCache(); |
| } |
| """) |
| tab.StartTimelineRecording() |
| |
| def NeedsBrowserRestartAfterEachRun(self, browser): |
| return not browser.tabs[0].ExecuteJavaScript(""" |
| window.chrome && |
| chrome.gpuBenchmarking && |
| chrome.gpuBenchmarking.clearImageCache; |
| """) |
| |
| def MeasurePage(self, page, tab, results): |
| tab.StopTimelineRecording() |
| def _IsDone(): |
| return tab.EvaluateJavaScript('isDone') |
| |
| decode_image_events = \ |
| tab.timeline_model.GetAllEventsOfName('DecodeImage') |
| |
| # If it is a real image page, then store only the last-minIterations |
| # decode tasks. |
| if (hasattr(page, |
| 'image_decoding_measurement_limit_results_to_min_iterations') and |
| page.image_decoding_measurement_limit_results_to_min_iterations): |
| assert _IsDone() |
| min_iterations = tab.EvaluateJavaScript('minIterations') |
| decode_image_events = decode_image_events[-min_iterations:] |
| |
| durations = [d.duration for d in decode_image_events] |
| if not durations: |
| results.Add('ImageDecoding_avg', 'ms', 'unsupported') |
| return |
| image_decoding_avg = sum(durations) / len(durations) |
| results.Add('ImageDecoding_avg', 'ms', image_decoding_avg) |
| results.Add('ImageLoading_avg', 'ms', |
| tab.EvaluateJavaScript('averageLoadingTimeMs()')) |
