| # Copyright 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 metrics import power |
| from telemetry.page import page_measurement |
| from telemetry.timeline import model |
| |
| |
| class ImageDecoding(page_measurement.PageMeasurement): |
| def __init__(self): |
| super(ImageDecoding, self).__init__() |
| self._power_metric = power.PowerMetric() |
| |
| def CustomizeBrowserOptions(self, options): |
| options.AppendExtraBrowserArgs('--enable-gpu-benchmarking') |
| power.PowerMetric.CustomizeBrowserOptions(options) |
| |
| def WillNavigateToPage(self, page, tab): |
| tab.ExecuteJavaScript(""" |
| if (window.chrome && |
| chrome.gpuBenchmarking && |
| chrome.gpuBenchmarking.clearImageCache) { |
| chrome.gpuBenchmarking.clearImageCache(); |
| } |
| """) |
| self._power_metric.Start(page, tab) |
| # FIXME: bare 'devtools' is for compatibility with older reference versions |
| # only and may eventually be removed. |
| # FIXME: Remove webkit.console when blink.console lands in chromium and |
| # the ref builds are updated. crbug.com/386847 |
| tab.browser.StartTracing( |
| 'disabled-by-default-devtools.timeline*,' + |
| 'devtools,webkit.console,blink.console') |
| |
| def StopBrowserAfterPage(self, browser, page): |
| return not browser.tabs[0].ExecuteJavaScript(""" |
| window.chrome && |
| chrome.gpuBenchmarking && |
| chrome.gpuBenchmarking.clearImageCache; |
| """) |
| |
| def MeasurePage(self, page, tab, results): |
| timeline_data = tab.browser.StopTracing() |
| timeline_model = model.TimelineModel(timeline_data) |
| self._power_metric.Stop(page, tab) |
| self._power_metric.AddResults(tab, results) |
| |
| def _IsDone(): |
| return tab.EvaluateJavaScript('isDone') |
| |
| decode_image_events = timeline_model.GetAllEventsOfName('Decode Image') |
| |
| # 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] |
| assert durations, 'Failed to find "Decode Image" trace events.' |
| |
| image_decoding_avg = sum(durations) / len(durations) |
| results.Add('ImageDecoding_avg', 'ms', image_decoding_avg) |
| results.Add('ImageLoading_avg', 'ms', |
| tab.EvaluateJavaScript('averageLoadingTimeMs()')) |
| |
| def CleanUpAfterPage(self, page, tab): |
| if tab.browser.is_tracing_running: |
| tab.browser.StopTracing() |
