The Tor Browser: widget/xpwidgets/nsBaseScreen.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     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/. */

     8 #define MOZ_FATAL_ASSERTIONS_FOR_THREAD_SAFETY

    10 #include "nsBaseScreen.h"

    12 NS_IMPL_ISUPPORTS(nsBaseScreen, nsIScreen)

    14 nsBaseScreen::nsBaseScreen()

    15 {

    16   for (uint32_t i = 0; i < nsIScreen::BRIGHTNESS_LEVELS; i++)

    17     mBrightnessLocks[i] = 0;

    18 }

    20 nsBaseScreen::~nsBaseScreen() { }

    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 }

    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 }

    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");

    46   CheckMinimumBrightness();

    48   return NS_OK;

    49 }

    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]--;

    61   CheckMinimumBrightness();

    63   return NS_OK;

    64 }

    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   }

    77   ApplyMinimumBrightness(brightness);

    78 }

    80 NS_IMETHODIMP

    81 nsBaseScreen::GetContentsScaleFactor(double* aContentsScaleFactor)

    82 {

    83   *aContentsScaleFactor = 1.0;

    84   return NS_OK;

    85 }

The Tor Browser / file revision

widget/xpwidgets/nsBaseScreen.cpp@97036ab72558

widget/xpwidgets/nsBaseScreen.cpp