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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 cr.define('gpu', function() {
      5   /**
      6    * This class provides a 'bridge' for communicating between javascript and the
      7    * browser. When run outside of WebUI, e.g. as a regular webpage, it provides
      8    * synthetic data to assist in testing.
      9    * @constructor
     10    */
     11   function BrowserBridge() {
     12     // If we are not running inside WebUI, output chrome.send messages
     13     // to the console to help with quick-iteration debugging.
     14     this.debugMode_ = (chrome.send === undefined && console.log);
     15     if (this.debugMode_) {
     16       var browserBridgeTests = document.createElement('script');
     17       browserBridgeTests.src = './gpu_internals/browser_bridge_tests.js';
     18       document.body.appendChild(browserBridgeTests);
     19     }
     20 
     21     this.nextRequestId_ = 0;
     22     this.pendingCallbacks_ = [];
     23     this.logMessages_ = [];
     24 
     25     // Tell c++ code that we are ready to receive GPU Info.
     26     if (!this.debugMode_) {
     27       chrome.send('browserBridgeInitialized');
     28       this.beginRequestClientInfo_();
     29       this.beginRequestLogMessages_();
     30     }
     31   }
     32 
     33   BrowserBridge.prototype = {
     34     __proto__: cr.EventTarget.prototype,
     35 
     36     applySimulatedData_: function applySimulatedData(data) {
     37       // set up things according to the simulated data
     38       this.gpuInfo_ = data.gpuInfo;
     39       this.clientInfo_ = data.clientInfo;
     40       this.logMessages_ = data.logMessages;
     41       cr.dispatchSimpleEvent(this, 'gpuInfoUpdate');
     42       cr.dispatchSimpleEvent(this, 'clientInfoChange');
     43       cr.dispatchSimpleEvent(this, 'logMessagesChange');
     44     },
     45 
     46     /**
     47      * Returns true if the page is hosted inside Chrome WebUI
     48      * Helps have behavior conditional to emulate_webui.py
     49      */
     50     get debugMode() {
     51       return this.debugMode_;
     52     },
     53 
     54     /**
     55      * Sends a message to the browser with specified args. The
     56      * browser will reply asynchronously via the provided callback.
     57      */
     58     callAsync: function(submessage, args, callback) {
     59       var requestId = this.nextRequestId_;
     60       this.nextRequestId_ += 1;
     61       this.pendingCallbacks_[requestId] = callback;
     62       if (!args) {
     63         chrome.send('callAsync', [requestId.toString(), submessage]);
     64       } else {
     65         var allArgs = [requestId.toString(), submessage].concat(args);
     66         chrome.send('callAsync', allArgs);
     67       }
     68     },
     69 
     70     /**
     71      * Called by gpu c++ code when client info is ready.
     72      */
     73     onCallAsyncReply: function(requestId, args) {
     74       if (this.pendingCallbacks_[requestId] === undefined) {
     75         throw new Error('requestId ' + requestId + ' is not pending');
     76       }
     77       var callback = this.pendingCallbacks_[requestId];
     78       callback(args);
     79       delete this.pendingCallbacks_[requestId];
     80     },
     81 
     82     /**
     83      * Get gpuInfo data.
     84      */
     85     get gpuInfo() {
     86       return this.gpuInfo_;
     87     },
     88 
     89     /**
     90      * Called from gpu c++ code when GPU Info is updated.
     91      */
     92     onGpuInfoUpdate: function(gpuInfo) {
     93       this.gpuInfo_ = gpuInfo;
     94       cr.dispatchSimpleEvent(this, 'gpuInfoUpdate');
     95     },
     96 
     97     /**
     98      * This function begins a request for the ClientInfo. If it comes back
     99      * as undefined, then we will issue the request again in 250ms.
    100      */
    101     beginRequestClientInfo_: function() {
    102       this.callAsync('requestClientInfo', undefined, (function(data) {
    103         if (data === undefined) { // try again in 250 ms
    104           window.setTimeout(this.beginRequestClientInfo_.bind(this), 250);
    105         } else {
    106           this.clientInfo_ = data;
    107           cr.dispatchSimpleEvent(this, 'clientInfoChange');
    108         }
    109       }).bind(this));
    110     },
    111 
    112     /**
    113      * Returns information about the currently running Chrome build.
    114      */
    115     get clientInfo() {
    116       return this.clientInfo_;
    117     },
    118 
    119     /**
    120      * This function checks for new GPU_LOG messages.
    121      * If any are found, a refresh is triggered.
    122      */
    123     beginRequestLogMessages_: function() {
    124       this.callAsync('requestLogMessages', undefined,
    125           (function(messages) {
    126             if (messages.length != this.logMessages_.length) {
    127               this.logMessages_ = messages;
    128               cr.dispatchSimpleEvent(this, 'logMessagesChange');
    129             }
    130             // check again in 250 ms
    131             window.setTimeout(this.beginRequestLogMessages_.bind(this), 250);
    132           }).bind(this));
    133     },
    134 
    135     /**
    136      * Returns an array of log messages issued by the GPU process, if any.
    137      */
    138     get logMessages() {
    139       return this.logMessages_;
    140     },
    141 
    142   };
    143 
    144   return {
    145     BrowserBridge: BrowserBridge
    146   };
    147 });
    148