The Tor Browser / file revision

 /* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

  *

  * 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/. */

 #include "nsISupports.idl"

 #include "nsIScreen.idl"

 [scriptable, uuid(1C195990-FF9E-412B-AFE7-67D1C660BB27)]

 interface nsIScreenManager : nsISupports

 {

     //

     // Returns the screen that contains the rectangle. If the rect overlaps

     // multiple screens, it picks the screen with the greatest area of intersection.

     //

     // The coordinates are in pixels (not twips) and in screen coordinates.

     //

   nsIScreen screenForRect ( in long left, in long top, in long width, in long height ) ;

     // The screen with the menubar/taskbar. This shouldn't be needed very

     // often.

   readonly attribute nsIScreen primaryScreen;

     // Holds the number of screens that are available

   readonly attribute unsigned long numberOfScreens;

     // The default DPI scaling factor of the screen environment (number of

     // screen pixels corresponding to 1 CSS px, at the default zoom level).

     //

     // This is currently fixed at 1.0 on most platforms, but varies on Windows

     // if the "logical DPI" scaling option in the Display control panel is set

     // to a value other than 100% (e.g. 125% or 150% are increasingly common

     // defaults on laptops with high-dpi screens). See bug 851520.

     //

     // NOTE that on OS X, this does -not- reflect the "backing scale factor"

     // used to support Retina displays, which is a per-display property,

     // not a system-wide scaling factor. The default ratio of CSS pixels to

     // Cocoa points remains 1:1, even on a Retina screen where one Cocoa point

     // corresponds to two device pixels. (This is exposed via other APIs:

     // see window.devicePixelRatio).

     //

     // NOTE also that on Linux, this does -not- currently reflect changes

     // to the system-wide (X11 or Gtk2) DPI value, as Firefox does not yet

     // honor these settings. See bug 798362 and bug 712898.

   readonly attribute float systemDefaultScale;

     // Returns the nsIScreen instance for the given native widget pointer;

     // the pointer is specific to the particular widget implementation,

     // and is generally of the same type that NS_NATIVE_WINDOW is.

   [noscript] nsIScreen screenForNativeWidget ( in voidPtr nativeWidget );

 };

 %{ C++

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