1 files changed, 55 insertions, 0 deletions
diff --git a/browser/themes/Windows8WindowFrameColor.sys.mjs b/browser/themes/Windows8WindowFrameColor.sys.mjs
new file mode 100644
index 0000000000..dfca020255
--- /dev/null
+++ b/browser/themes/Windows8WindowFrameColor.sys.mjs
@@ -0,0 +1,55 @@
+/* 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/. */
+
+import { WindowsRegistry as Registry } from "resource://gre/modules/WindowsRegistry.sys.mjs";
+
+export var Windows8WindowFrameColor = {
+  _windowFrameColor: null,
+
+  get() {
+    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"
+    );
+    if (customizationColor == undefined) {
+      // Seems to be the default color (hardcoded because of bug 1065998)
+      return [158, 158, 158];
+    }
+
+    // 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 [, fgR, fgG, fgB] = customizationColorArray.map(val =>
+      parseInt(val, 16)
+    );
+    let colorizationColorBalance = Registry.readRegKey(
+      HKCU,
+      dwmKey,
+      "ColorizationColorBalance"
+    );
+    if (colorizationColorBalance == undefined) {
+      colorizationColorBalance = 78;
+    }
+
+    // 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]);
+  },
+};