The Tor Browser / file revision

 /* 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/. */

 "use strict";

 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;

 this.EXPORTED_SYMBOLS = ["Windows8WindowFrameColor"];

 Cu.import("resource://gre/modules/Services.jsm");

 Cu.import("resource://gre/modules/XPCOMUtils.jsm");

 let Registry = Cu.import("resource://gre/modules/WindowsRegistry.jsm").WindowsRegistry;

 const Windows8WindowFrameColor = {

   _windowFrameColor: null,

   get: function() {

     if (this._windowFrameColor)

       return this._windowFrameColor;

     const HKCU = Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER;

     const dwmKey = "Software\\Microsoft\\Windows\\DWM";

     let customizationColor = Registry.readRegKey(HKCU, dwmKey,

                                                  "ColorizationColor");

     // The color returned from the Registry is in decimal form.

     let customizationColorHex = customizationColor.toString(16);

     // Zero-pad the number just to make sure that it is 8 digits.

     customizationColorHex = ("00000000" + customizationColorHex).substr(-8);

     let customizationColorArray = customizationColorHex.match(/../g);

     let [unused, fgR, fgG, fgB] = customizationColorArray.map(function(val) parseInt(val, 16));

     let colorizationColorBalance = Registry.readRegKey(HKCU, dwmKey,

                                                        "ColorizationColorBalance");

      // Window frame base color when Color Intensity is at 0, see bug 1004576.

     let frameBaseColor = 217;

     let alpha = colorizationColorBalance / 100;

     // Alpha-blend the foreground color with the frame base color.

     let r = Math.round(fgR * alpha + frameBaseColor * (1 - alpha));

     let g = Math.round(fgG * alpha + frameBaseColor * (1 - alpha));

     let b = Math.round(fgB * alpha + frameBaseColor * (1 - alpha));

     return this._windowFrameColor = [r, g, b];

   },

 };