gecko/widget/xpwidgets/nsBaseScreen.cpp

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at:
 * http://www.mozilla.org/MPL/
 *
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Code.
 *
 * The Initial Developer of the Original Code is
 *   The Mozilla Foundation
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Chris Jones <jones.chris.g@gmail.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsBaseScreen.h"

NS_IMPL_ISUPPORTS1(nsBaseScreen, nsIScreen)

nsBaseScreen::nsBaseScreen()
{
  for (PRUint32 i = 0; i < nsIScreen::BRIGHTNESS_LEVELS; i++)
    mBrightnessLocks[i] = 0;
}

nsBaseScreen::~nsBaseScreen() { }

NS_IMETHODIMP
nsBaseScreen::LockMinimumBrightness(PRUint32 aBrightness)
{
  NS_ABORT_IF_FALSE(
    aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
    "Invalid brightness level to lock");
  mBrightnessLocks[aBrightness]++;
  NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
    "Overflow after locking brightness level");

  CheckMinimumBrightness();

  return NS_OK;
}

NS_IMETHODIMP
nsBaseScreen::UnlockMinimumBrightness(PRUint32 aBrightness)
{
  NS_ABORT_IF_FALSE(
    aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
    "Invalid brightness level to lock");
  NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
    "Unlocking a brightness level with no corresponding lock");
  mBrightnessLocks[aBrightness]--;

  CheckMinimumBrightness();

  return NS_OK;
}

void
nsBaseScreen::CheckMinimumBrightness()
{
  PRUint32 brightness = nsIScreen::BRIGHTNESS_LEVELS;
  for (PRUint32 i = 0; i < nsIScreen::BRIGHTNESS_LEVELS; i++)
    if (mBrightnessLocks[i] > 0)
      brightness = i;

  ApplyMinimumBrightness(brightness);
}