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/* -*- 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"

[scriptable, uuid(d961f76e-8437-4bc6-9ada-a1c98ace9560)]
interface nsIScreen : nsISupports
{
  /**
   * Levels of brightness for the screen, from off to full brightness.
   */
  const unsigned long BRIGHTNESS_DIM = 0;
  const unsigned long BRIGHTNESS_FULL = 1;

  /* The number of different brightness levels */
  const unsigned long BRIGHTNESS_LEVELS = 2;

  /**
   * Allowable screen rotations, when the underlying widget toolkit
   * supports rotating the screen.
   *
   * ROTATION_0_DEG is the default, unrotated configuration.
   */
  const unsigned long   ROTATION_0_DEG = 0;
  const unsigned long  ROTATION_90_DEG = 1;
  const unsigned long ROTATION_180_DEG = 2;
  const unsigned long ROTATION_270_DEG = 3;

  void GetRect(out long left, out long top, out long width, out long height);
  void GetAvailRect(out long left, out long top, out long width, out long height);

  /**
   * Locks the minimum brightness of the screen, forcing it to be at
   * least as bright as a certain brightness level. Each call to this
   * function must eventually be followed by a corresponding call to
   * unlockMinimumBrightness, with the same brightness level.
   *
   * @param brightness A brightness level, one of the above constants.
   */
  void lockMinimumBrightness(in unsigned long brightness);

  /**
   * Releases a lock on the screen brightness. This must be called
   * (eventually) after a corresponding call to lockMinimumBrightness.
   *
   * @param brightness A brightness level, one of the above constants.
   */
  void unlockMinimumBrightness(in unsigned long brightness);
  
  readonly attribute long pixelDepth;
  readonly attribute long colorDepth;
  /**
   * Get/set the screen rotation, on platforms that support changing
   * screen rotation.
   */
  attribute unsigned long rotation;
};