The Tor Browser: accessible/src/atk/nsMaiInterfaceComponent.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: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=2 et sw=2 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "InterfaceInitFuncs.h"

     9 #include "AccessibleWrap.h"

    10 #include "nsAccUtils.h"

    11 #include "nsCoreUtils.h"

    12 #include "nsMai.h"

    13 #include "mozilla/Likely.h"

    15 using namespace mozilla::a11y;

    17 extern "C" {

    19 static AtkObject*

    20 refAccessibleAtPointCB(AtkComponent* aComponent, gint aAccX, gint aAccY,

    21                        AtkCoordType aCoordType)

    22 {

    23   return refAccessibleAtPointHelper(GetAccessibleWrap(ATK_OBJECT(aComponent)),

    24                                     aAccX, aAccY, aCoordType);

    25 }

    27 static void

    28 getExtentsCB(AtkComponent* aComponent, gint* aX, gint* aY,

    29              gint* aWidth, gint* aHeight, AtkCoordType aCoordType)

    30 {

    31   getExtentsHelper(GetAccessibleWrap(ATK_OBJECT(aComponent)),

    32                    aX, aY, aWidth, aHeight, aCoordType);

    33 }

    35 static gboolean

    36 grabFocusCB(AtkComponent* aComponent)

    37 {

    38   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aComponent));

    39   if (!accWrap)

    40     return FALSE;

    42   nsresult rv = accWrap->TakeFocus();

    43   return (NS_FAILED(rv)) ? FALSE : TRUE;

    44 }

    45 }

    47 AtkObject*

    48 refAccessibleAtPointHelper(AccessibleWrap* aAccWrap, gint aX, gint aY,

    49                            AtkCoordType aCoordType)

    50 {

    51   if (!aAccWrap || aAccWrap->IsDefunct() || nsAccUtils::MustPrune(aAccWrap))

    52     return nullptr;

    54   // Accessible::ChildAtPoint(x,y) is in screen pixels.

    55   if (aCoordType == ATK_XY_WINDOW) {

    56     nsIntPoint winCoords =

    57       nsCoreUtils::GetScreenCoordsForWindow(aAccWrap->GetNode());

    58     aX += winCoords.x;

    59     aY += winCoords.y;

    60   }

    62   Accessible* accAtPoint = aAccWrap->ChildAtPoint(aX, aY,

    63                                                   Accessible::eDirectChild);

    64   if (!accAtPoint)

    65     return nullptr;

    67   AtkObject* atkObj = AccessibleWrap::GetAtkObject(accAtPoint);

    68   if (atkObj)

    69     g_object_ref(atkObj);

    70   return atkObj;

    71 }

    73 void

    74 getExtentsHelper(AccessibleWrap* aAccWrap,

    75                  gint* aX, gint* aY, gint* aWidth, gint* aHeight,

    76                  AtkCoordType aCoordType)

    77 {

    78   *aX = *aY = *aWidth = *aHeight = 0;

    80   if (!aAccWrap || aAccWrap->IsDefunct())

    81     return;

    83   int32_t x = 0, y = 0, width = 0, height = 0;

    84   // Returned in screen coordinates

    85   nsresult rv = aAccWrap->GetBounds(&x, &y, &width, &height);

    86   if (NS_FAILED(rv))

    87     return;

    89   if (aCoordType == ATK_XY_WINDOW) {

    90     nsIntPoint winCoords =

    91       nsCoreUtils::GetScreenCoordsForWindow(aAccWrap->GetNode());

    92     x -= winCoords.x;

    93     y -= winCoords.y;

    94   }

    96   *aX = x;

    97   *aY = y;

    98   *aWidth = width;

    99   *aHeight = height;

   100 }

   102 void

   103 componentInterfaceInitCB(AtkComponentIface* aIface)

   104 {

   105   NS_ASSERTION(aIface, "Invalid Interface");

   106   if(MOZ_UNLIKELY(!aIface))

   107     return;

   109   /*

   110    * Use default implementation in atk for contains, get_position,

   111    * and get_size

   112    */

   113   aIface->ref_accessible_at_point = refAccessibleAtPointCB;

   114   aIface->get_extents = getExtentsCB;

   115   aIface->grab_focus = grabFocusCB;

   116 }

The Tor Browser / file revision

accessible/src/atk/nsMaiInterfaceComponent.cpp@97036ab72558

accessible/src/atk/nsMaiInterfaceComponent.cpp