Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 319 insertions, 0 deletions

diff --git a/dom/base/nsScreen.cpp b/dom/base/nsScreen.cpp
new file mode 100644
index 0000000000..a62d38d4af
--- /dev/null
+++ b/dom/base/nsScreen.cpp
@@ -0,0 +1,319 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsContentUtils.h"
+#include "nsScreen.h"
+#include "mozilla/dom/Document.h"
+#include "nsIDocShell.h"
+#include "mozilla/dom/Document.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(nsPIDOMWindowInner* aWindow) {
+  MOZ_ASSERT(aWindow);
+
+  if (!aWindow->GetDocShell()) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(aWindow);
+  NS_ENSURE_TRUE(sgo, nullptr);
+
+  RefPtr<nsScreen> screen = new nsScreen(aWindow);
+  return screen.forget();
+}
+
+nsScreen::nsScreen(nsPIDOMWindowInner* aWindow)
+    : DOMEventTargetHelper(aWindow),
+      mScreenOrientation(new ScreenOrientation(aWindow, this)) {}
+
+nsScreen::~nsScreen() = default;
+
+// QueryInterface implementation for nsScreen
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScreen)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_ADDREF_INHERITED(nsScreen, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(nsScreen, DOMEventTargetHelper)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(nsScreen, DOMEventTargetHelper,
+                                   mScreenOrientation)
+
+int32_t nsScreen::GetPixelDepth(ErrorResult& aRv) {
+  // Return 24 to prevent fingerprinting.
+  if (ShouldResistFingerprinting()) {
+    return 24;
+  }
+
+  nsDeviceContext* context = GetDeviceContext();
+
+  if (!context) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return -1;
+  }
+
+  uint32_t depth;
+  context->GetDepth(depth);
+  return depth;
+}
+
+nsPIDOMWindowOuter* nsScreen::GetOuter() const {
+  if (nsPIDOMWindowInner* inner = GetOwner()) {
+    return inner->GetOuterWindow();
+  }
+
+  return nullptr;
+}
+
+nsDeviceContext* nsScreen::GetDeviceContext() {
+  return nsLayoutUtils::GetDeviceContextForScreenInfo(GetOuter());
+}
+
+nsresult nsScreen::GetRect(nsRect& aRect) {
+  // Return window inner rect to prevent fingerprinting.
+  if (ShouldResistFingerprinting()) {
+    return GetWindowInnerRect(aRect);
+  }
+
+  // Here we manipulate the value of aRect to represent the screen size,
+  // if in RDM.
+  nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner();
+  if (owner) {
+    mozilla::dom::Document* doc = owner->GetExtantDoc();
+    if (doc) {
+      Maybe<mozilla::CSSIntSize> deviceSize =
+          nsGlobalWindowOuter::GetRDMDeviceSize(*doc);
+      if (deviceSize.isSome()) {
+        const mozilla::CSSIntSize& size = deviceSize.value();
+        aRect.SetRect(0, 0, size.width, size.height);
+        return NS_OK;
+      }
+    }
+  }
+
+  nsDeviceContext* context = GetDeviceContext();
+
+  if (!context) {
+    return NS_ERROR_FAILURE;
+  }
+
+  context->GetRect(aRect);
+  LayoutDevicePoint screenTopLeftDev = LayoutDevicePixel::FromAppUnits(
+      aRect.TopLeft(), context->AppUnitsPerDevPixel());
+  DesktopPoint screenTopLeftDesk =
+      screenTopLeftDev / context->GetDesktopToDeviceScale();
+
+  aRect.x = NSToIntRound(screenTopLeftDesk.x);
+  aRect.y = NSToIntRound(screenTopLeftDesk.y);
+
+  aRect.SetHeight(nsPresContext::AppUnitsToIntCSSPixels(aRect.Height()));
+  aRect.SetWidth(nsPresContext::AppUnitsToIntCSSPixels(aRect.Width()));
+
+  return NS_OK;
+}
+
+nsresult nsScreen::GetAvailRect(nsRect& aRect) {
+  // Return window inner rect to prevent fingerprinting.
+  if (ShouldResistFingerprinting()) {
+    return GetWindowInnerRect(aRect);
+  }
+
+  // Here we manipulate the value of aRect to represent the screen size,
+  // if in RDM.
+  nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner();
+  if (owner) {
+    mozilla::dom::Document* doc = owner->GetExtantDoc();
+    if (doc) {
+      Maybe<mozilla::CSSIntSize> deviceSize =
+          nsGlobalWindowOuter::GetRDMDeviceSize(*doc);
+      if (deviceSize.isSome()) {
+        const mozilla::CSSIntSize& size = deviceSize.value();
+        aRect.SetRect(0, 0, size.width, size.height);
+        return NS_OK;
+      }
+    }
+  }
+
+  nsDeviceContext* context = GetDeviceContext();
+
+  if (!context) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsRect r;
+  context->GetRect(r);
+  LayoutDevicePoint screenTopLeftDev = LayoutDevicePixel::FromAppUnits(
+      r.TopLeft(), context->AppUnitsPerDevPixel());
+  DesktopPoint screenTopLeftDesk =
+      screenTopLeftDev / context->GetDesktopToDeviceScale();
+
+  context->GetClientRect(aRect);
+
+  aRect.x = NSToIntRound(screenTopLeftDesk.x) +
+            nsPresContext::AppUnitsToIntCSSPixels(aRect.x - r.x);
+  aRect.y = NSToIntRound(screenTopLeftDesk.y) +
+            nsPresContext::AppUnitsToIntCSSPixels(aRect.y - r.y);
+
+  aRect.SetHeight(nsPresContext::AppUnitsToIntCSSPixels(aRect.Height()));
+  aRect.SetWidth(nsPresContext::AppUnitsToIntCSSPixels(aRect.Width()));
+
+  return NS_OK;
+}
+
+mozilla::dom::ScreenOrientation* nsScreen::Orientation() const {
+  return mScreenOrientation;
+}
+
+void nsScreen::GetMozOrientation(nsString& aOrientation,
+                                 CallerType aCallerType) const {
+  switch (mScreenOrientation->DeviceType(aCallerType)) {
+    case OrientationType::Portrait_primary:
+      aOrientation.AssignLiteral("portrait-primary");
+      break;
+    case OrientationType::Portrait_secondary:
+      aOrientation.AssignLiteral("portrait-secondary");
+      break;
+    case OrientationType::Landscape_primary:
+      aOrientation.AssignLiteral("landscape-primary");
+      break;
+    case OrientationType::Landscape_secondary:
+      aOrientation.AssignLiteral("landscape-secondary");
+      break;
+    default:
+      MOZ_CRASH("Unacceptable screen orientation type.");
+  }
+}
+
+static void UpdateDocShellOrientationLock(nsPIDOMWindowInner* aWindow,
+                                          hal::ScreenOrientation aOrientation) {
+  if (!aWindow) {
+    return;
+  }
+
+  nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
+  if (!docShell) {
+    return;
+  }
+
+  RefPtr<BrowsingContext> bc = docShell->GetBrowsingContext();
+  bc = bc ? bc->Top() : nullptr;
+  if (!bc) {
+    return;
+  }
+
+  // Setting orientation lock on a discarded context has no effect.
+  Unused << bc->SetOrientationLock(aOrientation);
+}
+
+bool nsScreen::MozLockOrientation(const nsAString& aOrientation,
+                                  ErrorResult& aRv) {
+  nsString orientation(aOrientation);
+  Sequence<nsString> orientations;
+  if (!orientations.AppendElement(orientation, fallible)) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return false;
+  }
+  return MozLockOrientation(orientations, aRv);
+}
+
+bool nsScreen::MozLockOrientation(const Sequence<nsString>& aOrientations,
+                                  ErrorResult& aRv) {
+  if (ShouldResistFingerprinting()) {
+    return false;
+  }
+  hal::ScreenOrientation orientation = hal::eScreenOrientation_None;
+
+  for (uint32_t i = 0; i < aOrientations.Length(); ++i) {
+    const nsString& item = aOrientations[i];
+
+    if (item.EqualsLiteral("portrait")) {
+      orientation |= hal::eScreenOrientation_PortraitPrimary |
+                     hal::eScreenOrientation_PortraitSecondary;
+    } else if (item.EqualsLiteral("portrait-primary")) {
+      orientation |= hal::eScreenOrientation_PortraitPrimary;
+    } else if (item.EqualsLiteral("portrait-secondary")) {
+      orientation |= hal::eScreenOrientation_PortraitSecondary;
+    } else if (item.EqualsLiteral("landscape")) {
+      orientation |= hal::eScreenOrientation_LandscapePrimary |
+                     hal::eScreenOrientation_LandscapeSecondary;
+    } else if (item.EqualsLiteral("landscape-primary")) {
+      orientation |= hal::eScreenOrientation_LandscapePrimary;
+    } else if (item.EqualsLiteral("landscape-secondary")) {
+      orientation |= hal::eScreenOrientation_LandscapeSecondary;
+    } else if (item.EqualsLiteral("default")) {
+      orientation |= hal::eScreenOrientation_Default;
+    } else {
+      // If we don't recognize the token, we should just return 'false'
+      // without throwing.
+      return false;
+    }
+  }
+
+  switch (mScreenOrientation->GetLockOrientationPermission(false)) {
+    case ScreenOrientation::LOCK_DENIED:
+      return false;
+    case ScreenOrientation::LOCK_ALLOWED:
+      UpdateDocShellOrientationLock(GetOwner(), orientation);
+      return mScreenOrientation->LockDeviceOrientation(orientation, false, aRv);
+    case ScreenOrientation::FULLSCREEN_LOCK_ALLOWED:
+      UpdateDocShellOrientationLock(GetOwner(), orientation);
+      return mScreenOrientation->LockDeviceOrientation(orientation, true, aRv);
+  }
+
+  // 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() {
+  if (ShouldResistFingerprinting()) {
+    return;
+  }
+  UpdateDocShellOrientationLock(GetOwner(), hal::eScreenOrientation_None);
+  mScreenOrientation->UnlockDeviceOrientation();
+}
+
+/* virtual */
+JSObject* nsScreen::WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) {
+  return Screen_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+nsresult nsScreen::GetWindowInnerRect(nsRect& aRect) {
+  aRect.x = 0;
+  aRect.y = 0;
+  nsCOMPtr<nsPIDOMWindowInner> win = GetOwner();
+  if (!win) {
+    return NS_ERROR_FAILURE;
+  }
+  double width;
+  double height;
+  nsresult rv = win->GetInnerWidth(&width);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = win->GetInnerHeight(&height);
+  NS_ENSURE_SUCCESS(rv, rv);
+  // FIXME(emilio): This is an nsRect but should really be a CSSIntRect, these
+  // are CSS pixels!
+  aRect.SizeTo(std::round(width), std::round(height));
+  return NS_OK;
+}
+
+bool nsScreen::ShouldResistFingerprinting() const {
+  bool resist = false;
+  nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner();
+  if (owner) {
+    resist = nsContentUtils::ShouldResistFingerprinting(owner->GetDocShell());
+  }
+  return resist;
+}