gecko-dev/b2g/components/OopCommandLine.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Services", "resource://gre/modules/Services.jsm");

function oopCommandlineHandler() {
}

oopCommandlineHandler.prototype = {
    handle: function(cmdLine) {
        let oopFlag = cmdLine.handleFlag("oop", false);
        if (oopFlag) {
            /**
             * Manipulate preferences by adding to the *default* branch.  Adding
             * to the default branch means the changes we make won"t get written
             * back to user preferences.
             */
            let prefs = Services.prefs
            let branch = prefs.getDefaultBranch("");

            try {
                // Turn on all OOP services, making desktop run similar to phone
                // environment
                branch.setBoolPref("dom.ipc.tabs.disabled", false);
                branch.setBoolPref("layers.acceleration.disabled", false);
                branch.setBoolPref("layers.offmainthreadcomposition.async-animations", true);
                branch.setBoolPref("layers.async-video.enabled", true);
                branch.setBoolPref("layers.async-pan-zoom.enabled", true);
                branch.setCharPref("gfx.content.azure.backends", "cairo");
            } catch (e) { }

        }
        if (cmdLine.state == Ci.nsICommandLine.STATE_REMOTE_AUTO) {
            cmdLine.preventDefault = true;
        }
    },

    helpInfo: "  --oop        Use out-of-process model in B2G\n",
    classID: Components.ID("{e30b0e13-2d12-4cb0-bc4c-4e617a1bf76e}"),
    QueryInterface: XPCOMUtils.generateQI([Ci.nsICommandLineHandler]),
};

this.NSGetFactory = XPCOMUtils.generateNSGetFactory([oopCommandlineHandler]);