gecko-dev/widget/xpwidgets/nsBaseScreen.cpp

62 lines
1.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* 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/. */
#define MOZ_FATAL_ASSERTIONS_FOR_THREAD_SAFETY
#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);
}