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// Copyright (c) 2011 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.
cr.define('gpu', function() {
/**
* This class provides a 'bridge' for communicating between javascript and
* the browser.
* @constructor
*/
function BrowserBridge() {
// If we are not running inside WebUI, output chrome.send messages
// to the console to help with quick-iteration debugging.
if (chrome.send === undefined && console.log) {
this.debugMode_ = true;
chrome.send = function(messageHandler, args) {
console.log('chrome.send', messageHandler, args);
};
} else {
this.debugMode_ = false;
}
this.nextRequestId_ = 0;
this.pendingCallbacks_ = [];
// Tell c++ code that we are ready to receive GPU Info.
chrome.send('browserBridgeInitialized');
}
BrowserBridge.prototype = {
__proto__: cr.EventTarget.prototype,
/**
* Returns true if the page is hosted inside Chrome WebUI
* Helps have behavior conditional to emulate_webui.py
*/
get debugMode() {
return this.debugMode_;
},
/**
* Sends a message to the browser with specified args. The
* browser will reply asynchronously via the provided callback.
*/
callAsync: function(submessage, args, callback) {
var requestId = this.nextRequestId_;
this.nextRequestId_ += 1;
this.pendingCallbacks_[requestId] = callback;
if (!args) {
chrome.send('callAsync', [requestId.toString(), submessage]);
} else {
var allArgs = [requestId.toString(), submessage].concat(args);
chrome.send('callAsync', allArgs);
}
},
/**
* Called by gpu c++ code when client info is ready.
*/
onCallAsyncReply: function(requestId, args) {
if (this.pendingCallbacks_[requestId] === undefined) {
throw new Error('requestId ' + requestId + ' is not pending');
}
var callback = this.pendingCallbacks_[requestId];
callback(args);
delete this.pendingCallbacks_[requestId];
},
/**
* Get gpuInfo data.
*/
get gpuInfo() {
return this.gpuInfo_;
},
/**
* Called from gpu c++ code when GPU Info is updated.
*/
onGpuInfoUpdate: function(gpuInfo) {
this.gpuInfo_ = gpuInfo;
cr.dispatchSimpleEvent(this, 'gpuInfoUpdate');
}
};
return {
BrowserBridge: BrowserBridge
};
});
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