michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: "use strict";
michael@0: const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
michael@0: 
michael@0: this.EXPORTED_SYMBOLS = ["Windows8WindowFrameColor"];
michael@0: 
michael@0: Cu.import("resource://gre/modules/Services.jsm");
michael@0: Cu.import("resource://gre/modules/XPCOMUtils.jsm");
michael@0: let Registry = Cu.import("resource://gre/modules/WindowsRegistry.jsm").WindowsRegistry;
michael@0: 
michael@0: const Windows8WindowFrameColor = {
michael@0:   _windowFrameColor: null,
michael@0: 
michael@0:   get: function() {
michael@0:     if (this._windowFrameColor)
michael@0:       return this._windowFrameColor;
michael@0: 
michael@0:     const HKCU = Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER;
michael@0:     const dwmKey = "Software\\Microsoft\\Windows\\DWM";
michael@0:     let customizationColor = Registry.readRegKey(HKCU, dwmKey,
michael@0:                                                  "ColorizationColor");
michael@0:     // The color returned from the Registry is in decimal form.
michael@0:     let customizationColorHex = customizationColor.toString(16);
michael@0:     // Zero-pad the number just to make sure that it is 8 digits.
michael@0:     customizationColorHex = ("00000000" + customizationColorHex).substr(-8);
michael@0:     let customizationColorArray = customizationColorHex.match(/../g);
michael@0:     let [unused, fgR, fgG, fgB] = customizationColorArray.map(function(val) parseInt(val, 16));
michael@0:     let colorizationColorBalance = Registry.readRegKey(HKCU, dwmKey,
michael@0:                                                        "ColorizationColorBalance");
michael@0:      // Window frame base color when Color Intensity is at 0, see bug 1004576.
michael@0:     let frameBaseColor = 217;
michael@0:     let alpha = colorizationColorBalance / 100;
michael@0: 
michael@0:     // Alpha-blend the foreground color with the frame base color.
michael@0:     let r = Math.round(fgR * alpha + frameBaseColor * (1 - alpha));
michael@0:     let g = Math.round(fgG * alpha + frameBaseColor * (1 - alpha));
michael@0:     let b = Math.round(fgB * alpha + frameBaseColor * (1 - alpha));
michael@0:     return this._windowFrameColor = [r, g, b];
michael@0:   },
michael@0: };