third_party/WebKit/Source/devtools/front_end/components_lazy/FilmStripModel.js

   1 /*
   2  * Copyright 2015 The Chromium Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7 /**
   8  * @constructor
   9  * @param {!WebInspector.TracingModel} tracingModel
  10  * @param {number=} zeroTime
  11  */
  12 WebInspector.FilmStripModel = function(tracingModel, zeroTime)
  13 {
  14     this._tracingModel = tracingModel;
  15     this._zeroTime = zeroTime || tracingModel.minimumRecordTime();
  16
  17     /** @type {!Array<!WebInspector.FilmStripModel.Frame>} */
  18     this._frames = [];
  19
  20     var browserProcess = tracingModel.processByName("Browser");
  21     if (!browserProcess)
  22         return;
  23     var mainThread = browserProcess.threadByName("CrBrowserMain");
  24     if (!mainThread)
  25         return;
  26
  27     var events = mainThread.events();
  28     for (var i = 0; i < events.length; ++i) {
  29         var event = events[i];
  30         if (event.startTime < this._zeroTime)
  31             continue;
  32         if (!event.hasCategory(WebInspector.FilmStripModel._category))
  33             continue;
  34         if (event.name === WebInspector.FilmStripModel.TraceEvents.CaptureFrame) {
  35             var data = event.args["data"];
  36             if (data)
  37                 this._frames.push(WebInspector.FilmStripModel.Frame._fromEvent(this, event, this._frames.length));
  38         } else if (event.name === WebInspector.FilmStripModel.TraceEvents.Screenshot) {
  39             this._frames.push(WebInspector.FilmStripModel.Frame._fromSnapshot(this, /** @type {!WebInspector.TracingModel.ObjectSnapshot} */ (event), this._frames.length));
  40         }
  41     }
  42 }
  43
  44 WebInspector.FilmStripModel._category = "disabled-by-default-devtools.screenshot";
  45
  46 WebInspector.FilmStripModel.TraceEvents = {
  47     CaptureFrame: "CaptureFrame",
  48     Screenshot: "Screenshot"
  49 }
  50
  51 WebInspector.FilmStripModel.prototype = {
  52     /**
  53      * @return {!Array<!WebInspector.FilmStripModel.Frame>}
  54      */
  55     frames: function()
  56     {
  57         return this._frames;
  58     },
  59
  60     /**
  61      * @return {number}
  62      */
  63     zeroTime: function()
  64     {
  65         return this._zeroTime;
  66     },
  67
  68     /**
  69      * @param {number} timestamp
  70      * @return {?WebInspector.FilmStripModel.Frame}
  71      */
  72     frameByTimestamp: function(timestamp)
  73     {
  74         /**
  75          * @param {number} timestamp
  76          * @param {!WebInspector.FilmStripModel.Frame} frame
  77          * @return {number}
  78          */
  79         function comparator(timestamp, frame)
  80         {
  81             return timestamp - frame.timestamp;
  82         }
  83         var index = this._frames.lowerBound(timestamp, comparator);
  84         return index < this._frames.length ? this._frames[index] : null;
  85     }
  86 }
  87
  88 /**
  89  * @constructor
  90  * @param {!WebInspector.FilmStripModel} model
  91  * @param {number} timestamp
  92  * @param {number} index
  93  */
  94 WebInspector.FilmStripModel.Frame = function(model, timestamp, index)
  95 {
  96     this._model = model;
  97     this.timestamp = timestamp;
  98     this.index = index;
  99     /** @type {?string} */
 100     this._imageData = null;
 101     /** @type {?WebInspector.TracingModel.ObjectSnapshot} */
 102     this._snapshot = null;
 103 }
 104
 105 /**
 106  * @param {!WebInspector.FilmStripModel} model
 107  * @param {!WebInspector.TracingModel.Event} event
 108  * @param {number} index
 109  * @return {!WebInspector.FilmStripModel.Frame}
 110  */
 111 WebInspector.FilmStripModel.Frame._fromEvent = function(model, event, index)
 112 {
 113     var frame = new WebInspector.FilmStripModel.Frame(model, event.startTime, index);
 114     frame._imageData = event.args["data"];
 115     return frame;
 116 }
 117
 118 /**
 119  * @param {!WebInspector.FilmStripModel} model
 120  * @param {!WebInspector.TracingModel.ObjectSnapshot} snapshot
 121  * @param {number} index
 122  * @return {!WebInspector.FilmStripModel.Frame}
 123  */
 124 WebInspector.FilmStripModel.Frame._fromSnapshot = function(model, snapshot, index)
 125 {
 126     var frame = new WebInspector.FilmStripModel.Frame(model, snapshot.startTime, index);
 127     frame._snapshot = snapshot;
 128     return frame;
 129 }
 130
 131 WebInspector.FilmStripModel.Frame.prototype = {
 132     /**
 133      * @return {!WebInspector.FilmStripModel}
 134      */
 135     model: function()
 136     {
 137         return this._model;
 138     },
 139
 140     /**
 141      * @return {!Promise<?string>}
 142      */
 143     imageDataPromise: function()
 144     {
 145         if (this._imageData || !this._snapshot)
 146             return Promise.resolve(this._imageData);
 147
 148         return /** @type {!Promise<?string>} */ (this._snapshot.objectPromise());
 149     }
 150 }