The Tor Browser: dom/base/nsScreen.cpp@6474c204b198 (annotated)

dom/base/nsScreen.cpp@6474c204b198 (annotated)

dom/base/nsScreen.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
 #include "mozilla/Hal.h"
 #include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
 #include "mozilla/dom/ScreenBinding.h"
 #include "nsScreen.h"
 #include "nsIDocument.h"
 #include "nsIDocShell.h"
 #include "nsIDocument.h"
 #include "nsPresContext.h"
 #include "nsCOMPtr.h"
 #include "nsIDocShellTreeItem.h"
 #include "nsLayoutUtils.h"
 #include "nsJSUtils.h"
 #include "nsDeviceContext.h"
 using namespace mozilla;
 using namespace mozilla::dom;
 /* static */ already_AddRefed<nsScreen>
 nsScreen::Create(nsPIDOMWindow* aWindow)
 {
   MOZ_ASSERT(aWindow);
   if (!aWindow->GetDocShell()) {
     return nullptr;
   }
   nsCOMPtr<nsIScriptGlobalObject> sgo =
     do_QueryInterface(static_cast<nsPIDOMWindow*>(aWindow));
   NS_ENSURE_TRUE(sgo, nullptr);
   nsRefPtr<nsScreen> screen = new nsScreen(aWindow);
   hal::RegisterScreenConfigurationObserver(screen);
   hal::ScreenConfiguration config;
   hal::GetCurrentScreenConfiguration(&config);
   screen->mOrientation = config.orientation();
   return screen.forget();
 }
 nsScreen::nsScreen(nsPIDOMWindow* aWindow)
   : DOMEventTargetHelper(aWindow)
   , mEventListener(nullptr)
 {
 }
 nsScreen::~nsScreen()
 {
   MOZ_ASSERT(!mEventListener);
   hal::UnregisterScreenConfigurationObserver(this);
 }
 // QueryInterface implementation for nsScreen
 NS_INTERFACE_MAP_BEGIN(nsScreen)
   NS_INTERFACE_MAP_ENTRY(nsIDOMScreen)
 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
 NS_IMPL_ADDREF_INHERITED(nsScreen, DOMEventTargetHelper)
 NS_IMPL_RELEASE_INHERITED(nsScreen, DOMEventTargetHelper)
 int32_t
 nsScreen::GetPixelDepth(ErrorResult& aRv)
 {
   // For non-chrome callers, always return 24 to prevent fingerprinting.
   if (!IsChrome()) return 24;
   nsDeviceContext* context = GetDeviceContext();
   if (!context) {
     aRv.Throw(NS_ERROR_FAILURE);
     return -1;
   }
   uint32_t depth;
   context->GetDepth(depth);
   return depth;
 }
 #define FORWARD_LONG_GETTER(_name)                                              \
   NS_IMETHODIMP                                                                 \
   nsScreen::Get ## _name(int32_t* aOut)                                         \
   {                                                                             \
     ErrorResult rv;                                                             \
     *aOut = Get ## _name(rv);                                                   \
     return rv.ErrorCode();                                                      \
   }
 FORWARD_LONG_GETTER(AvailWidth)
 FORWARD_LONG_GETTER(AvailHeight)
 FORWARD_LONG_GETTER(Width)
 FORWARD_LONG_GETTER(Height)
 FORWARD_LONG_GETTER(Top)
 FORWARD_LONG_GETTER(Left)
 FORWARD_LONG_GETTER(AvailTop)
 FORWARD_LONG_GETTER(AvailLeft)
 FORWARD_LONG_GETTER(PixelDepth)
 FORWARD_LONG_GETTER(ColorDepth)
 nsDeviceContext*
 nsScreen::GetDeviceContext()
 {
   return nsLayoutUtils::GetDeviceContextForScreenInfo(GetOwner());
 }
 nsresult
 nsScreen::GetRect(nsRect& aRect)
 {
   // For non-chrome callers, return window inner rect to prevent fingerprinting.
   if (!IsChrome()) return GetWindowInnerRect(aRect);
   nsDeviceContext *context = GetDeviceContext();
   if (!context) {
     return NS_ERROR_FAILURE;
   }
   context->GetRect(aRect);
   aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
   aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
   aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
   aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
   return NS_OK;
 }
 nsresult
 nsScreen::GetAvailRect(nsRect& aRect)
 {
   // For non-chrome callers, return window inner rect to prevent fingerprinting.
   if (!IsChrome()) return GetWindowInnerRect(aRect);
   nsDeviceContext *context = GetDeviceContext();
   if (!context) {
     return NS_ERROR_FAILURE;
   }
   context->GetClientRect(aRect);
   aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
   aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
   aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
   aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
   return NS_OK;
 }
 void
 nsScreen::Notify(const hal::ScreenConfiguration& aConfiguration)
 {
   ScreenOrientation previousOrientation = mOrientation;
   mOrientation = aConfiguration.orientation();
   NS_ASSERTION(mOrientation == eScreenOrientation_PortraitPrimary ||
                mOrientation == eScreenOrientation_PortraitSecondary ||
                mOrientation == eScreenOrientation_LandscapePrimary ||
                mOrientation == eScreenOrientation_LandscapeSecondary,
                "Invalid orientation value passed to notify method!");
   if (mOrientation != previousOrientation) {
     DispatchTrustedEvent(NS_LITERAL_STRING("mozorientationchange"));
   }
 }
 void
 nsScreen::GetMozOrientation(nsString& aOrientation)
 {
   if (!IsChrome()) {
     aOrientation.AssignLiteral("landscape-primary");
   } else {
     switch (mOrientation) {
     case eScreenOrientation_PortraitPrimary:
       aOrientation.AssignLiteral("portrait-primary");
       break;
     case eScreenOrientation_PortraitSecondary:
       aOrientation.AssignLiteral("portrait-secondary");
       break;
     case eScreenOrientation_LandscapePrimary:
       aOrientation.AssignLiteral("landscape-primary");
       break;
     case eScreenOrientation_LandscapeSecondary:
       aOrientation.AssignLiteral("landscape-secondary");
       break;
     case eScreenOrientation_None:
     default:
       MOZ_CRASH("Unacceptable mOrientation value");
     }
   }
 }
 NS_IMETHODIMP
 nsScreen::GetSlowMozOrientation(nsAString& aOrientation)
 {
   nsString orientation;
   GetMozOrientation(orientation);
   aOrientation = orientation;
   return NS_OK;
 }
 nsScreen::LockPermission
 nsScreen::GetLockOrientationPermission() const
 {
   nsCOMPtr<nsPIDOMWindow> owner = GetOwner();
   if (!owner) {
     return LOCK_DENIED;
   }
   // Chrome can always lock the screen orientation.
   nsIDocShell* docShell = owner->GetDocShell();
   if (docShell && docShell->ItemType() == nsIDocShellTreeItem::typeChrome) {
     return LOCK_ALLOWED;
   }
   nsCOMPtr<nsIDocument> doc = owner->GetDoc();
   if (!doc || doc->Hidden()) {
     return LOCK_DENIED;
   }
   // Apps can always lock the screen orientation.
   if (doc->NodePrincipal()->GetAppStatus() >=
         nsIPrincipal::APP_STATUS_INSTALLED) {
     return LOCK_ALLOWED;
   }
   // Other content must be full-screen in order to lock orientation.
   return doc->MozFullScreen() ? FULLSCREEN_LOCK_ALLOWED : LOCK_DENIED;
 }
 bool
 nsScreen::MozLockOrientation(const nsAString& aOrientation, ErrorResult& aRv)
 {
   nsString orientation(aOrientation);
   Sequence<nsString> orientations;
   if (!orientations.AppendElement(orientation)) {
     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
     return false;
   }
   return MozLockOrientation(orientations, aRv);
 }
 bool
 nsScreen::MozLockOrientation(const Sequence<nsString>& aOrientations,
                              ErrorResult& aRv)
 {
   ScreenOrientation orientation = eScreenOrientation_None;
   for (uint32_t i = 0; i < aOrientations.Length(); ++i) {
     const nsString& item = aOrientations[i];
     if (item.EqualsLiteral("portrait")) {
       orientation |= eScreenOrientation_PortraitPrimary |
                      eScreenOrientation_PortraitSecondary;
     } else if (item.EqualsLiteral("portrait-primary")) {
       orientation |= eScreenOrientation_PortraitPrimary;
     } else if (item.EqualsLiteral("portrait-secondary")) {
       orientation |= eScreenOrientation_PortraitSecondary;
     } else if (item.EqualsLiteral("landscape")) {
       orientation |= eScreenOrientation_LandscapePrimary |
                      eScreenOrientation_LandscapeSecondary;
     } else if (item.EqualsLiteral("landscape-primary")) {
       orientation |= eScreenOrientation_LandscapePrimary;
     } else if (item.EqualsLiteral("landscape-secondary")) {
       orientation |= eScreenOrientation_LandscapeSecondary;
     } else if (item.EqualsLiteral("default")) {
       orientation |= eScreenOrientation_Default;
     } else {
       // If we don't recognize the token, we should just return 'false'
       // without throwing.
       return false;
     }
   }
   switch (GetLockOrientationPermission()) {
     case LOCK_DENIED:
       return false;
     case LOCK_ALLOWED:
       return hal::LockScreenOrientation(orientation);
     case FULLSCREEN_LOCK_ALLOWED: {
       // We need to register a listener so we learn when we leave full-screen
       // and when we will have to unlock the screen.
       // This needs to be done before LockScreenOrientation call to make sure
       // the locking can be unlocked.
       nsCOMPtr<EventTarget> target = do_QueryInterface(GetOwner()->GetDoc());
       if (!target) {
         return false;
       }
       if (!hal::LockScreenOrientation(orientation)) {
         return false;
       }
       // We are fullscreen and lock has been accepted.
       if (!mEventListener) {
         mEventListener = new FullScreenEventListener();
       }
       aRv = target->AddSystemEventListener(NS_LITERAL_STRING("mozfullscreenchange"),
                                            mEventListener, /* useCapture = */ true);
       return true;
     }
   }
   // This is only for compilers that don't understand that the previous switch
   // will always return.
   MOZ_CRASH("unexpected lock orientation permission value");
 }
 void
 nsScreen::MozUnlockOrientation()
 {
   hal::UnlockScreenOrientation();
 }
 bool
 nsScreen::IsDeviceSizePageSize()
 {
   nsPIDOMWindow* owner = GetOwner();
   if (owner) {
     nsIDocShell* docShell = owner->GetDocShell();
     if (docShell) {
       return docShell->GetDeviceSizeIsPageSize();
     }
   }
   return false;
 }
 /* virtual */
 JSObject*
 nsScreen::WrapObject(JSContext* aCx)
 {
   return ScreenBinding::Wrap(aCx, this);
 }
 NS_IMPL_ISUPPORTS(nsScreen::FullScreenEventListener, nsIDOMEventListener)
 NS_IMETHODIMP
 nsScreen::FullScreenEventListener::HandleEvent(nsIDOMEvent* aEvent)
 {
 #ifdef DEBUG
   nsAutoString eventType;
   aEvent->GetType(eventType);
   MOZ_ASSERT(eventType.EqualsLiteral("mozfullscreenchange"));
 #endif
   nsCOMPtr<EventTarget> target = aEvent->InternalDOMEvent()->GetCurrentTarget();
   MOZ_ASSERT(target);
   nsCOMPtr<nsIDocument> doc = do_QueryInterface(target);
   MOZ_ASSERT(doc);
   // We have to make sure that the event we got is the event sent when
   // fullscreen is disabled because we could get one when fullscreen
   // got enabled if the lock call is done at the same moment.
   if (doc->MozFullScreen()) {
     return NS_OK;
   }
   target->RemoveSystemEventListener(NS_LITERAL_STRING("mozfullscreenchange"),
                                     this, true);
   hal::UnlockScreenOrientation();
   return NS_OK;
 }
 bool
 nsScreen::IsChrome()
 {
   nsCOMPtr<nsPIDOMWindow> owner = GetOwner();
   if (owner && owner->GetDocShell()) {
     return owner->GetDocShell()->ItemType() == nsIDocShellTreeItem::typeChrome;
   }
   return false;
 }
 nsresult
 nsScreen::GetDOMWindow(nsIDOMWindow **aResult)
 {
   NS_ENSURE_ARG_POINTER(aResult);
   *aResult = NULL;
   nsCOMPtr<nsPIDOMWindow> owner = GetOwner();
   if (!owner)
     return NS_ERROR_FAILURE;
   nsCOMPtr<nsIDOMWindow> win = do_QueryInterface(owner);
   NS_ENSURE_STATE(win);
   win.swap(*aResult);
   return NS_OK;
 }
 nsresult
 nsScreen::GetWindowInnerRect(nsRect& aRect)
 {
   aRect.x = 0;
   aRect.y = 0;
   nsCOMPtr<nsIDOMWindow> win;
   nsresult rv = GetDOMWindow(getter_AddRefs(win));
   NS_ENSURE_SUCCESS(rv, rv);
   rv = win->GetInnerWidth(&aRect.width);
   NS_ENSURE_SUCCESS(rv, rv);
   return win->GetInnerHeight(&aRect.height);
 }

The Tor Browser / annotate

dom/base/nsScreen.cpp@6474c204b198 (annotated)

dom/base/nsScreen.cpp