| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2015 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. |
| --> |
| |
| <link rel="import" href="/tracing/base/sorted_array_utils.html"> |
| |
| <script> |
| 'use strict'; |
| |
| /** |
| * @fileoverview Class for representing SurfaceFlinger process and its Vsyncs. |
| */ |
| tr.exportTo('tr.model.helpers', function() { |
| var findLowIndexInSortedArray = tr.b.findLowIndexInSortedArray; |
| |
| var VSYNC_SF_NAME = 'android.VSYNC-sf'; |
| var VSYNC_APP_NAME = 'android.VSYNC-app'; |
| var VSYNC_FALLBACK_NAME = 'android.VSYNC'; |
| |
| // when sampling vsync, push samples back by this much to ensure |
| // frame start samples *between* vsyncs |
| var TIMESTAMP_FUDGE_MS = 0.01; |
| |
| function getVsyncTimestamps(process, counterName) { |
| |
| var vsync = process.counters[counterName]; |
| if (!vsync) |
| vsync = process.counters[VSYNC_FALLBACK_NAME]; |
| |
| if (vsync && vsync.numSeries == 1 && vsync.numSamples > 1) |
| return vsync.series[0].timestamps; |
| return undefined; |
| } |
| |
| /** |
| * Model for SurfaceFlinger specific data. |
| * @constructor |
| */ |
| function AndroidSurfaceFlinger(process, thread) { |
| this.process = process; |
| this.thread = thread; |
| |
| this.appVsync_ = undefined; |
| this.sfVsync_ = undefined; |
| |
| this.appVsyncTimestamps_ = getVsyncTimestamps(process, VSYNC_APP_NAME); |
| this.sfVsyncTimestamps_ = getVsyncTimestamps(process, VSYNC_SF_NAME); |
| }; |
| |
| AndroidSurfaceFlinger.createForProcessIfPossible = function(process) { |
| var mainThread = process.getThread(process.pid); |
| |
| // newer versions - main thread, lowercase name, preceeding forward slash |
| if (mainThread && mainThread.name && |
| /surfaceflinger/.test(mainThread.name)) |
| return new AndroidSurfaceFlinger(process, mainThread); |
| |
| // older versions - another thread is named SurfaceFlinger |
| var primaryThreads = process.findAllThreadsNamed('SurfaceFlinger'); |
| if (primaryThreads.length == 1) |
| return new AndroidSurfaceFlinger(process, primaryThreads[0]); |
| return undefined; |
| }; |
| |
| AndroidSurfaceFlinger.prototype = { |
| get hasVsyncs() { |
| return !!this.appVsyncTimestamps_ && !!this.sfVsyncTimestamps_; |
| }, |
| |
| getFrameKickoff: function(timestamp) { |
| if (!this.hasVsyncs) |
| throw new Error('cannot query vsync info without vsyncs'); |
| |
| var firstGreaterIndex = |
| findLowIndexInSortedArray(this.appVsyncTimestamps_, |
| function(x) { return x; }, |
| timestamp + TIMESTAMP_FUDGE_MS); |
| |
| if (firstGreaterIndex < 1) |
| return undefined; |
| return this.appVsyncTimestamps_[firstGreaterIndex - 1]; |
| }, |
| |
| getFrameDeadline: function(timestamp) { |
| if (!this.hasVsyncs) |
| throw new Error('cannot query vsync info without vsyncs'); |
| |
| var firstGreaterIndex = |
| findLowIndexInSortedArray(this.sfVsyncTimestamps_, |
| function(x) { return x; }, |
| timestamp + TIMESTAMP_FUDGE_MS); |
| if (firstGreaterIndex >= this.sfVsyncTimestamps_.length) |
| return undefined; |
| return this.sfVsyncTimestamps_[firstGreaterIndex]; |
| } |
| }; |
| |
| return { |
| AndroidSurfaceFlinger: AndroidSurfaceFlinger |
| }; |
| }); |
| </script> |
