widget/nsBaseScreen.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: sw=2 ts=8 et :
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #define MOZ_FATAL_ASSERTIONS_FOR_THREAD_SAFETY
   9
  10 #include "nsBaseScreen.h"
  11
  12 NS_IMPL_ISUPPORTS(nsBaseScreen, nsIScreen)
  13
  14 nsBaseScreen::nsBaseScreen()
  15 {
  16   for (uint32_t i = 0; i < nsIScreen::BRIGHTNESS_LEVELS; i++)
  17     mBrightnessLocks[i] = 0;
  18 }
  19
  20 nsBaseScreen::~nsBaseScreen() { }
  21
  22 NS_IMETHODIMP
  23 nsBaseScreen::GetRectDisplayPix(int32_t *outLeft,  int32_t *outTop,
  24                                 int32_t *outWidth, int32_t *outHeight)
  25 {
  26   return GetRect(outLeft, outTop, outWidth, outHeight);
  27 }
  28
  29 NS_IMETHODIMP
  30 nsBaseScreen::GetAvailRectDisplayPix(int32_t *outLeft,  int32_t *outTop,
  31                                      int32_t *outWidth, int32_t *outHeight)
  32 {
  33   return GetAvailRect(outLeft, outTop, outWidth, outHeight);
  34 }
  35
  36 NS_IMETHODIMP
  37 nsBaseScreen::LockMinimumBrightness(uint32_t aBrightness)
  38 {
  39   NS_ABORT_IF_FALSE(
  40     aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
  41     "Invalid brightness level to lock");
  42   mBrightnessLocks[aBrightness]++;
  43   NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
  44     "Overflow after locking brightness level");
  45
  46   CheckMinimumBrightness();
  47
  48   return NS_OK;
  49 }
  50
  51 NS_IMETHODIMP
  52 nsBaseScreen::UnlockMinimumBrightness(uint32_t aBrightness)
  53 {
  54   NS_ABORT_IF_FALSE(
  55     aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
  56     "Invalid brightness level to lock");
  57   NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
  58     "Unlocking a brightness level with no corresponding lock");
  59   mBrightnessLocks[aBrightness]--;
  60
  61   CheckMinimumBrightness();
  62
  63   return NS_OK;
  64 }
  65
  66 void
  67 nsBaseScreen::CheckMinimumBrightness()
  68 {
  69   uint32_t brightness = nsIScreen::BRIGHTNESS_LEVELS;
  70   for (int32_t i = nsIScreen::BRIGHTNESS_LEVELS - 1; i >=0; i--) {
  71     if (mBrightnessLocks[i] > 0) {
  72       brightness = i;
  73       break;
  74     }
  75   }
  76
  77   ApplyMinimumBrightness(brightness);
  78 }
  79
  80 NS_IMETHODIMP
  81 nsBaseScreen::GetContentsScaleFactor(double* aContentsScaleFactor)
  82 {
  83   *aContentsScaleFactor = 1.0;
  84   return NS_OK;
  85 }