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| <html><head><title>Python: module telemetry.web_perf.metrics.rendering_stats</title> |
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| <font color="#ffffff" face="helvetica, arial"> <br><big><big><strong><a href="telemetry.html"><font color="#ffffff">telemetry</font></a>.<a href="telemetry.web_perf.html"><font color="#ffffff">web_perf</font></a>.<a href="telemetry.web_perf.metrics.html"><font color="#ffffff">metrics</font></a>.rendering_stats</strong></big></big></font></td |
| ><td align=right valign=bottom |
| ><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="../telemetry/web_perf/metrics/rendering_stats.py">telemetry/web_perf/metrics/rendering_stats.py</a></font></td></tr></table> |
| <p><tt># Copyright 2014 The Chromium Authors. All rights reserved.<br> |
| # Use of this source code is governed by a BSD-style license that can be<br> |
| # found in the LICENSE file.</tt></p> |
| <p> |
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| <font color="#ffffff" face="helvetica, arial"><big><strong>Modules</strong></big></font></td></tr> |
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| <tr><td bgcolor="#aa55cc"><tt> </tt></td><td> </td> |
| <td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="itertools.html">itertools</a><br> |
| </td><td width="25%" valign=top><a href="telemetry.web_perf.metrics.rendering_frame.html">telemetry.web_perf.metrics.rendering_frame</a><br> |
| </td><td width="25%" valign=top></td><td width="25%" valign=top></td></tr></table></td></tr></table><p> |
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| <font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr> |
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| <tr><td bgcolor="#ee77aa"><tt> </tt></td><td> </td> |
| <td width="100%"><dl> |
| <dt><font face="helvetica, arial"><a href="__builtin__.html#object">__builtin__.object</a> |
| </font></dt><dd> |
| <dl> |
| <dt><font face="helvetica, arial"><a href="telemetry.web_perf.metrics.rendering_stats.html#RenderingStats">RenderingStats</a> |
| </font></dt></dl> |
| </dd> |
| </dl> |
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| <font color="#000000" face="helvetica, arial"><a name="RenderingStats">class <strong>RenderingStats</strong></a>(<a href="__builtin__.html#object">__builtin__.object</a>)</font></td></tr> |
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| <tr><td bgcolor="#ffc8d8"><tt> </tt></td><td> </td> |
| <td width="100%">Methods defined here:<br> |
| <dl><dt><a name="RenderingStats-__init__"><strong>__init__</strong></a>(self, renderer_process, browser_process, surface_flinger_process, timeline_ranges)</dt><dd><tt>Utility class for extracting rendering statistics from the timeline (or<br> |
| other loggin facilities), and providing them in a common format to classes<br> |
| that compute benchmark metrics from this data.<br> |
| <br> |
| Stats are lists of lists of numbers. The outer list stores one list per<br> |
| timeline range.<br> |
| <br> |
| All *_time values are measured in milliseconds.</tt></dd></dl> |
| |
| <hr> |
| Data descriptors defined here:<br> |
| <dl><dt><strong>__dict__</strong></dt> |
| <dd><tt>dictionary for instance variables (if defined)</tt></dd> |
| </dl> |
| <dl><dt><strong>__weakref__</strong></dt> |
| <dd><tt>list of weak references to the object (if defined)</tt></dd> |
| </dl> |
| </td></tr></table></td></tr></table><p> |
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| <td colspan=3 valign=bottom> <br> |
| <font color="#ffffff" face="helvetica, arial"><big><strong>Functions</strong></big></font></td></tr> |
| |
| <tr><td bgcolor="#eeaa77"><tt> </tt></td><td> </td> |
| <td width="100%"><dl><dt><a name="-ComputeEventLatencies"><strong>ComputeEventLatencies</strong></a>(input_events)</dt><dd><tt>Compute input event latencies.<br> |
| <br> |
| Input event latency is the time from when the input event is created to<br> |
| when its resulted page is swap buffered.<br> |
| Input event on differnt platforms uses different LatencyInfo component to<br> |
| record its creation timestamp. We go through the following component list<br> |
| to find the creation timestamp:<br> |
| 1. INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT -- when event is created in OS<br> |
| 2. INPUT_EVENT_LATENCY_UI_COMPONENT -- when event reaches Chrome<br> |
| 3. INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT -- when event reaches RenderWidget<br> |
| <br> |
| If the latency starts with a<br> |
| LATENCY_BEGIN_SCROLL_UPDATE_MAIN_COMPONENT component, then it is<br> |
| classified as a scroll update instead of a normal input latency measure.<br> |
| <br> |
| Returns:<br> |
| A list sorted by increasing start time of latencies which are tuples of<br> |
| (input_event_name, latency_in_ms).</tt></dd></dl> |
| <dl><dt><a name="-GetLatencyEvents"><strong>GetLatencyEvents</strong></a>(process, timeline_range)</dt><dd><tt>Get LatencyInfo trace events from the process's trace buffer that are<br> |
| within the timeline_range.<br> |
| <br> |
| Input events dump their LatencyInfo into trace buffer as async trace event<br> |
| of name starting with "InputLatency". Non-input events with name starting<br> |
| with "Latency". The trace event has a memeber 'data' containing its latency<br> |
| history.</tt></dd></dl> |
| <dl><dt><a name="-GetTimestampEventName"><strong>GetTimestampEventName</strong></a>(process)</dt><dd><tt>Returns the name of the events used to count frame timestamps.</tt></dd></dl> |
| <dl><dt><a name="-HasRenderingStats"><strong>HasRenderingStats</strong></a>(process)</dt><dd><tt>Returns True if the process contains at least one<br> |
| BenchmarkInstrumentation::*<a href="#RenderingStats">RenderingStats</a> event with a frame.</tt></dd></dl> |
| </td></tr></table><p> |
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| <td colspan=3 valign=bottom> <br> |
| <font color="#ffffff" face="helvetica, arial"><big><strong>Data</strong></big></font></td></tr> |
| |
| <tr><td bgcolor="#55aa55"><tt> </tt></td><td> </td> |
| <td width="100%"><strong>APPROXIMATED_PIXEL_ERROR</strong> = 'approximated_pixel_percentages'<br> |
| <strong>APPROXIMATED_VISIBLE_CONTENT_DATA</strong> = 'approximated_visible_content_area'<br> |
| <strong>BEGIN_COMP_NAME</strong> = 'INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT'<br> |
| <strong>BEGIN_SCROLL_UPDATE_COMP_NAME</strong> = 'LATENCY_BEGIN_SCROLL_LISTENER_UPDATE_MAIN_COMPONENT'<br> |
| <strong>CHECKERBOARDED_PIXEL_ERROR</strong> = 'checkerboarded_pixel_percentages'<br> |
| <strong>CHECKERBOARDED_VISIBLE_CONTENT_DATA</strong> = 'checkerboarded_visible_content_area'<br> |
| <strong>END_COMP_NAME</strong> = 'INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT'<br> |
| <strong>FORWARD_SCROLL_UPDATE_COMP_NAME</strong> = 'INPUT_EVENT_LATENCY_FORWARD_SCROLL_UPDATE_TO_MAIN_COMPONENT'<br> |
| <strong>GESTURE_SCROLL_UPDATE_EVENT_NAME</strong> = 'InputLatency::GestureScrollUpdate'<br> |
| <strong>MAIN_THREAD_SCROLL_UPDATE_EVENT_NAME</strong> = 'Latency::ScrollUpdate'<br> |
| <strong>ORIGINAL_COMP_NAME</strong> = 'INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT'<br> |
| <strong>UI_COMP_NAME</strong> = 'INPUT_EVENT_LATENCY_UI_COMPONENT'<br> |
| <strong>VISIBLE_CONTENT_DATA</strong> = 'visible_content_area'</td></tr></table> |
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