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