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   MOZ_ASSERT(aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
  40              "Invalid brightness level to lock");
  41   mBrightnessLocks[aBrightness]++;
  42   MOZ_ASSERT(mBrightnessLocks[aBrightness] > 0,
  43              "Overflow after locking brightness level");
  44
  45   CheckMinimumBrightness();
  46
  47   return NS_OK;
  48 }
  49
  50 NS_IMETHODIMP
  51 nsBaseScreen::UnlockMinimumBrightness(uint32_t aBrightness)
  52 {
  53   MOZ_ASSERT(aBrightness < nsIScreen::BRIGHTNESS_LEVELS,
  54              "Invalid brightness level to lock");
  55   MOZ_ASSERT(mBrightnessLocks[aBrightness] > 0,
  56              "Unlocking a brightness level with no corresponding lock");
  57   mBrightnessLocks[aBrightness]--;
  58
  59   CheckMinimumBrightness();
  60
  61   return NS_OK;
  62 }
  63
  64 void
  65 nsBaseScreen::CheckMinimumBrightness()
  66 {
  67   uint32_t brightness = nsIScreen::BRIGHTNESS_LEVELS;
  68   for (int32_t i = nsIScreen::BRIGHTNESS_LEVELS - 1; i >=0; i--) {
  69     if (mBrightnessLocks[i] > 0) {
  70       brightness = i;
  71       break;
  72     }
  73   }
  74
  75   ApplyMinimumBrightness(brightness);
  76 }
  77
  78 NS_IMETHODIMP
  79 nsBaseScreen::GetContentsScaleFactor(double* aContentsScaleFactor)
  80 {
  81   *aContentsScaleFactor = 1.0;
  82   return NS_OK;
  83 }