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diff --git a/modules/Windows8WindowFrameColor.jsm b/modules/Windows8WindowFrameColor.jsm
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+/* 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");
+Cu.import("resource://gre/modules/WindowsRegistry.jsm");
+
+var Windows8WindowFrameColor = {
+ _windowFrameColor: null,
+
+ get_win8: function() {
+ if (this._windowFrameColor)
+ return this._windowFrameColor;
+
+ const HKCU = Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER;
+ const dwmKey = "Software\\Microsoft\\Windows\\DWM";
+
+ // Window frame base color component values when Color Intensity is at 0.
+ let frameBaseColor = 217;
+
+ let windowFrameColor = WindowsRegistry.readRegKey(HKCU, dwmKey,
+ "ColorizationColor");
+ if (windowFrameColor == undefined) {
+ // Return the default color if unset or colorization not used
+ return this._windowFrameColor = [frameBaseColor, frameBaseColor, frameBaseColor];
+ }
+ // The color returned from the Registry is in decimal form.
+ let windowFrameColorHex = windowFrameColor.toString(16);
+ // Zero-pad the number just to make sure that it is 8 digits.
+ windowFrameColorHex = ("00000000" + windowFrameColorHex).substr(-8);
+ let windowFrameColorArray = windowFrameColorHex.match(/../g);
+ let [unused, fgR, fgG, fgB] = windowFrameColorArray.map(function(val) parseInt(val, 16));
+ let windowFrameColorBalance = WindowsRegistry.readRegKey(HKCU, dwmKey,
+ "ColorizationColorBalance");
+ // Default to balance=78 if reg key isn't defined
+ if (windowFrameColorBalance == undefined) {
+ windowFrameColorBalance = 78;
+ }
+ let alpha = windowFrameColorBalance / 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];
+ }
+};