1 files changed, 53 insertions, 0 deletions
diff --git a/modules/Windows8WindowFrameColor.jsm b/modules/Windows8WindowFrameColor.jsm
new file mode 100644
index 0000000..e7a447d
--- /dev/null
+++ b/modules/Windows8WindowFrameColor.jsm
@@ -0,0 +1,53 @@
+/* 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];
+  }
+};