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-rw-r--r--dom/base/nsScreen.cpp232
1 files changed, 232 insertions, 0 deletions
diff --git a/dom/base/nsScreen.cpp b/dom/base/nsScreen.cpp
new file mode 100644
index 0000000000..b4ac142f35
--- /dev/null
+++ b/dom/base/nsScreen.cpp
@@ -0,0 +1,232 @@
+/* -*- 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 "nsPresContext.h"
+#include "nsCOMPtr.h"
+#include "nsIDocShellTreeItem.h"
+#include "nsLayoutUtils.h"
+#include "nsJSUtils.h"
+#include "nsDeviceContext.h"
+#include "mozilla/widget/ScreenManager.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;
+ }
+
+ return context->GetDepth();
+}
+
+nsPIDOMWindowOuter* nsScreen::GetOuter() const {
+ if (nsPIDOMWindowInner* inner = GetOwner()) {
+ return inner->GetOuterWindow();
+ }
+
+ return nullptr;
+}
+
+nsDeviceContext* nsScreen::GetDeviceContext() const {
+ return nsLayoutUtils::GetDeviceContextForScreenInfo(GetOuter());
+}
+
+nsresult nsScreen::GetRect(CSSIntRect& 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.
+ if (nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner()) {
+ if (Document* doc = owner->GetExtantDoc()) {
+ Maybe<CSSIntSize> deviceSize =
+ nsGlobalWindowOuter::GetRDMDeviceSize(*doc);
+ if (deviceSize.isSome()) {
+ const 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);
+ aRect = CSSIntRect::FromAppUnitsRounded(r);
+ return NS_OK;
+}
+
+nsresult nsScreen::GetAvailRect(CSSIntRect& 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.
+ if (nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner()) {
+ if (Document* doc = owner->GetExtantDoc()) {
+ Maybe<CSSIntSize> deviceSize =
+ nsGlobalWindowOuter::GetRDMDeviceSize(*doc);
+ if (deviceSize.isSome()) {
+ const 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->GetClientRect(r);
+ aRect = CSSIntRect::FromAppUnitsRounded(r);
+ return NS_OK;
+}
+
+uint16_t nsScreen::GetOrientationAngle() const {
+ nsDeviceContext* context = GetDeviceContext();
+ if (context) {
+ return context->GetScreenOrientationAngle();
+ }
+ RefPtr<widget::Screen> s =
+ widget::ScreenManager::GetSingleton().GetPrimaryScreen();
+ return s->GetOrientationAngle();
+}
+
+hal::ScreenOrientation nsScreen::GetOrientationType() const {
+ nsDeviceContext* context = GetDeviceContext();
+ if (context) {
+ return context->GetScreenOrientationType();
+ }
+ RefPtr<widget::Screen> s =
+ widget::ScreenManager::GetSingleton().GetPrimaryScreen();
+ return s->GetOrientationType();
+}
+
+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.");
+ }
+}
+
+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);
+}
+
+// This function is deprecated, use ScreenOrientation API instead.
+bool nsScreen::MozLockOrientation(const Sequence<nsString>& aOrientations,
+ ErrorResult& aRv) {
+ return false;
+}
+
+void nsScreen::MozUnlockOrientation() {}
+
+/* virtual */
+JSObject* nsScreen::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ return Screen_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+nsresult nsScreen::GetWindowInnerRect(CSSIntRect& 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);
+ aRect.SizeTo(std::round(width), std::round(height));
+ return NS_OK;
+}
+
+bool nsScreen::ShouldResistFingerprinting() const {
+ nsCOMPtr<nsPIDOMWindowInner> owner = GetOwner();
+ return owner &&
+ nsGlobalWindowInner::Cast(owner)->ShouldResistFingerprinting();
+}