Quelle nsBaseWidget.cpp Sprache: C

/* -*- 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 "nsBaseWidget.h"

#include <utility>

#include "GLConsts.h"
#include "InputData.h"
#include "LiveResizeListener.h"
#include "SwipeTracker.h"
#include "TouchEvents.h"
#include "X11UndefineNone.h"
#include "base/thread.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/GlobalKeyListener.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/Logging.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/NativeKeyBindingsType.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticPrefs_apz.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_layers.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/TextEventDispatcher.h"
#include "mozilla/TextEventDispatcherListener.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/VsyncDispatcher.h"
#include "mozilla/dom/BrowserParent.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/SimpleGestureEventBinding.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/layers/APZCCallbackHelper.h"
#include "mozilla/layers/TouchActionHelper.h"
#include "mozilla/layers/APZEventState.h"
#include "mozilla/layers/APZInputBridge.h"
#include "mozilla/layers/APZThreadUtils.h"
#include "mozilla/layers/ChromeProcessController.h"
#include "mozilla/layers/Compositor.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/CompositorBridgeParent.h"
#include "mozilla/layers/CompositorOptions.h"
#include "mozilla/layers/IAPZCTreeManager.h"
#include "mozilla/layers/ImageBridgeChild.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/webrender/WebRenderTypes.h"
#include "mozilla/widget/ScreenManager.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsBaseDragService.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsDeviceContext.h"
#include "nsGfxCIID.h"
#include "nsIAppWindow.h"
#include "nsIBaseWindow.h"
#include "nsIContent.h"
#include "nsIScreenManager.h"
#include "nsISimpleEnumerator.h"
#include "nsIWidgetListener.h"
#include "nsRefPtrHashtable.h"
#include "nsServiceManagerUtils.h"
#include "nsWidgetsCID.h"
#include "nsXULPopupManager.h"
#include "prdtoa.h"
#include "prenv.h"
#ifdef ACCESSIBILITY
#  include "nsAccessibilityService.h"
#endif
#include "gfxConfig.h"
#include "gfxUtils.h"  // for ToDeviceColor
#include "mozilla/layers/CompositorSession.h"
#include "VRManagerChild.h"
#include "gfxConfig.h"
#include "nsView.h"
#include "nsViewManager.h"

static mozilla::LazyLogModule sBaseWidgetLog("BaseWidget");

#ifdef DEBUG
#  include "nsIObserver.h"

static void debug_RegisterPrefCallbacks();

#endif

#ifdef NOISY_WIDGET_LEAKS
static int32_t gNumWidgets;
#endif

using namespace mozilla::dom;
using namespace mozilla::layers;
using namespace mozilla::ipc;
using namespace mozilla::widget;
using namespace mozilla;

// Async pump timer during injected long touch taps
#define TOUCH_INJECT_PUMP_TIMER_MSEC 50
#define TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC 1500
int32_t nsIWidget::sPointerIdCounter = 0;

// Some statics from nsIWidget.h
/*static*/
uint64_t AutoObserverNotifier::sObserverId = 0;
MOZ_RUNINIT /*static*/ nsTHashMap<uint64_t, nsCOMPtr<nsIObserver>>
    AutoObserverNotifier::sSavedObservers;

// The maximum amount of time to let the EnableDragDrop runnable wait in the
// idle queue before timing out and moving it to the regular queue. Value is in
// milliseconds.
const uint32_t kAsyncDragDropTimeout = 1000;

NS_IMPL_ISUPPORTS(nsBaseWidget, nsIWidget, nsISupportsWeakReference)

//-------------------------------------------------------------------------
//
// nsBaseWidget constructor
//
//-------------------------------------------------------------------------

nsBaseWidget::nsBaseWidget() : nsBaseWidget(BorderStyle::None) {}

nsBaseWidget::nsBaseWidget(BorderStyle aBorderStyle)
    : mWidgetListener(nullptr),
      mAttachedWidgetListener(nullptr),
      mPreviouslyAttachedWidgetListener(nullptr),
      mCompositorVsyncDispatcher(nullptr),
      mBorderStyle(aBorderStyle),
      mBounds(0, 0, 0, 0),
      mIsTiled(false),
      mPopupLevel(PopupLevel::Top),
      mPopupType(PopupType::Any),
      mHasRemoteContent(false),
      mUpdateCursor(true),
      mUseAttachedEvents(false),
      mIMEHasFocus(false),
      mIMEHasQuit(false),
      mIsFullyOccluded(false),
      mNeedFastSnaphot(false),
      mCurrentPanGestureBelongsToSwipe(false),
      mIsPIPWindow(false) {
#ifdef NOISY_WIDGET_LEAKS
  gNumWidgets++;
  printf("WIDGETS+ = %d\n", gNumWidgets);
#endif

#ifdef DEBUG
  debug_RegisterPrefCallbacks();
#endif

  mShutdownObserver = new WidgetShutdownObserver(this);
}

NS_IMPL_ISUPPORTS(WidgetShutdownObserver, nsIObserver)

WidgetShutdownObserver::WidgetShutdownObserver(nsBaseWidget* aWidget)
    : mWidget(aWidget), mRegistered(false) {
  Register();
}

WidgetShutdownObserver::~WidgetShutdownObserver() {
  // No need to call Unregister(), we can't be destroyed until nsBaseWidget
  // gets torn down. The observer service and nsBaseWidget have a ref on us
  // so nsBaseWidget has to call Unregister and then clear its ref.
}

NS_IMETHODIMP
WidgetShutdownObserver::Observe(nsISupports* aSubject, const char* aTopic,
                                const char16_t* aData) {
  if (!mWidget) {
    return NS_OK;
  }
  if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
    RefPtr<nsBaseWidget> widget(mWidget);
    widget->Shutdown();
  } else if (!strcmp(aTopic, "quit-application")) {
    RefPtr<nsBaseWidget> widget(mWidget);
    widget->QuitIME();
  }
  return NS_OK;
}

void WidgetShutdownObserver::Register() {
  if (!mRegistered) {
    mRegistered = true;
    nsContentUtils::RegisterShutdownObserver(this);

#ifndef MOZ_WIDGET_ANDROID
    // The primary purpose of observing quit-application is
    // to avoid leaking a widget on Windows when nothing else
    // breaks the circular reference between the widget and
    // TSFTextStore. However, our Android IME code crashes if
    // doing this on Android, so let's not do this on Android.
    // Doing this on Gtk and Mac just in case.
    nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
    if (observerService) {
      observerService->AddObserver(this, "quit-application", false);
    }
#endif
  }
}

void WidgetShutdownObserver::Unregister() {
  if (mRegistered) {
    mWidget = nullptr;

#ifndef MOZ_WIDGET_ANDROID
    nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
    if (observerService) {
      observerService->RemoveObserver(this, "quit-application");
    }
#endif

    nsContentUtils::UnregisterShutdownObserver(this);
    mRegistered = false;
  }
}

#define INTL_APP_LOCALES_CHANGED "intl:app-locales-changed"

NS_IMPL_ISUPPORTS(LocalesChangedObserver, nsIObserver)

LocalesChangedObserver::LocalesChangedObserver(nsBaseWidget* aWidget)
    : mWidget(aWidget), mRegistered(false) {
  Register();
}

LocalesChangedObserver::~LocalesChangedObserver() {
  // No need to call Unregister(), we can't be destroyed until nsBaseWidget
  // gets torn down. The observer service and nsBaseWidget have a ref on us
  // so nsBaseWidget has to call Unregister and then clear its ref.
}

NS_IMETHODIMP
LocalesChangedObserver::Observe(nsISupports* aSubject, const char* aTopic,
                                const char16_t* aData) {
  if (!mWidget) {
    return NS_OK;
  }
  if (!strcmp(aTopic, INTL_APP_LOCALES_CHANGED)) {
    RefPtr<nsBaseWidget> widget(mWidget);
    widget->LocalesChanged();
  }
  return NS_OK;
}

void LocalesChangedObserver::Register() {
  if (mRegistered) {
    return;
  }

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  if (obs) {
    obs->AddObserver(this, INTL_APP_LOCALES_CHANGED, true);
  }

  // Locale might be update before registering
  RefPtr<nsBaseWidget> widget(mWidget);
  widget->LocalesChanged();

  mRegistered = true;
}

void LocalesChangedObserver::Unregister() {
  if (!mRegistered) {
    return;
  }

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  if (obs) {
    obs->RemoveObserver(this, INTL_APP_LOCALES_CHANGED);
  }

  mWidget = nullptr;
  mRegistered = false;
}

void nsBaseWidget::Shutdown() {
  NotifyLiveResizeStopped();
  DestroyCompositor();
  FreeLocalesChangedObserver();
  FreeShutdownObserver();
}

void nsBaseWidget::QuitIME() {
  IMEStateManager::WidgetOnQuit(this);
  this->mIMEHasQuit = true;
}

void nsBaseWidget::DestroyCompositor() {
  RevokeTransactionIdAllocator();

  // We release this before releasing the compositor, since it may hold the
  // last reference to our ClientLayerManager. ClientLayerManager's dtor can
  // trigger a paint, creating a new compositor, and we don't want to re-use
  // the old vsync dispatcher.
  if (mCompositorVsyncDispatcher) {
    MOZ_ASSERT(mCompositorVsyncDispatcherLock.get());

    MutexAutoLock lock(*mCompositorVsyncDispatcherLock.get());
    mCompositorVsyncDispatcher->Shutdown();
    mCompositorVsyncDispatcher = nullptr;
  }

  // The compositor shutdown sequence looks like this:
  //  1. CompositorSession calls CompositorBridgeChild::Destroy.
  //  2. CompositorBridgeChild synchronously sends WillClose.
  //  3. CompositorBridgeParent releases some resources (such as the layer
  //     manager, compositor, and widget).
  //  4. CompositorBridgeChild::Destroy returns.
  //  5. Asynchronously, CompositorBridgeParent::ActorDestroy will fire on the
  //     compositor thread when the I/O thread closes the IPC channel.
  //  6. Step 5 will schedule DeferredDestroy on the compositor thread, which
  //     releases the reference CompositorBridgeParent holds to itself.
  //
  // When CompositorSession::Shutdown returns, we assume the compositor is gone
  // or will be gone very soon.
  if (mCompositorSession) {
    ReleaseContentController();
    mAPZC = nullptr;
    SetCompositorWidgetDelegate(nullptr);
    mCompositorBridgeChild = nullptr;
    mCompositorSession->Shutdown();
    mCompositorSession = nullptr;
  }
}

// This prevents the layer manager from starting a new transaction during
// shutdown.
void nsBaseWidget::RevokeTransactionIdAllocator() {
  if (!mWindowRenderer || !mWindowRenderer->AsWebRender()) {
    return;
  }
  mWindowRenderer->AsWebRender()->SetTransactionIdAllocator(nullptr);
}

void nsBaseWidget::ReleaseContentController() {
  if (mRootContentController) {
    mRootContentController->Destroy();
    mRootContentController = nullptr;
  }
}

void nsBaseWidget::DestroyLayerManager() {
  if (mWindowRenderer) {
    mWindowRenderer->Destroy();
    mWindowRenderer = nullptr;
  }
  DestroyCompositor();
}

void nsBaseWidget::OnRenderingDeviceReset() { DestroyLayerManager(); }

void nsBaseWidget::FreeShutdownObserver() {
  if (mShutdownObserver) {
    mShutdownObserver->Unregister();
  }
  mShutdownObserver = nullptr;
}

void nsBaseWidget::FreeLocalesChangedObserver() {
  if (mLocalesChangedObserver) {
    mLocalesChangedObserver->Unregister();
  }
  mLocalesChangedObserver = nullptr;
}

//-------------------------------------------------------------------------
//
// nsBaseWidget destructor
//
//-------------------------------------------------------------------------

nsBaseWidget::~nsBaseWidget() {
  if (mSwipeTracker) {
    mSwipeTracker->Destroy();
    mSwipeTracker = nullptr;
  }

  IMEStateManager::WidgetDestroyed(this);

  FreeLocalesChangedObserver();
  FreeShutdownObserver();
  DestroyLayerManager();

#ifdef NOISY_WIDGET_LEAKS
  gNumWidgets--;
  printf("WIDGETS- = %d\n", gNumWidgets);
#endif
}

//-------------------------------------------------------------------------
//
// Basic create.
//
//-------------------------------------------------------------------------
void nsBaseWidget::BaseCreate(nsIWidget* aParent, widget::InitData* aInitData) {
  if (aInitData) {
    mWindowType = aInitData->mWindowType;
    mBorderStyle = aInitData->mBorderStyle;
    mPopupLevel = aInitData->mPopupLevel;
    mPopupType = aInitData->mPopupHint;
    mHasRemoteContent = aInitData->mHasRemoteContent;
    mIsPIPWindow = aInitData->mPIPWindow;
  }

  mParent = aParent;
  if (mParent) {
    mParent->AddToChildList(this);
  }
}

void nsIWidget::ClearParent() {
  if (!mParent) {
    return;
  }
  nsCOMPtr<nsIWidget> kungFuDeathGrip = this;
  nsCOMPtr<nsIWidget> oldParent = mParent;
  oldParent->RemoveFromChildList(this);
  mParent = nullptr;
  DidClearParent(oldParent);
}

void nsIWidget::RemoveAllChildren() {
  while (nsCOMPtr<nsIWidget> kid = mLastChild) {
    kid->ClearParent();
    MOZ_ASSERT(kid != mLastChild);
  }
}

//-------------------------------------------------------------------------
//
// Accessor functions to get/set the client data
//
//-------------------------------------------------------------------------

nsIWidgetListener* nsBaseWidget::GetWidgetListener() const {
  return mWidgetListener;
}

void nsBaseWidget::SetWidgetListener(nsIWidgetListener* aWidgetListener) {
  mWidgetListener = aWidgetListener;
}

already_AddRefed<nsIWidget> nsBaseWidget::CreateChild(
    const LayoutDeviceIntRect& aRect, widget::InitData& aInitData) {
  nsCOMPtr<nsIWidget> widget;
  switch (mWidgetType) {
    case WidgetType::Native: {
      if (aInitData.mWindowType == WindowType::Popup) {
        widget = AllocateChildPopupWidget();
      } else {
        widget = nsIWidget::CreateChildWindow();
      }
      break;
    }
    case WidgetType::Headless:
      widget = nsIWidget::CreateHeadlessWidget();
      break;
    case WidgetType::Puppet: {
      // This really only should happen in crashtests that have menupopups.
      MOZ_ASSERT(aInitData.mWindowType == WindowType::Popup,
                 "Creating non-popup puppet widget?");
      widget = nsIWidget::CreatePuppetWidget(nullptr);
      break;
    }
  }

  if (!widget) {
    return nullptr;
  }

  if (mNeedFastSnaphot) {
    widget->SetNeedFastSnaphot();
  }

  if (NS_FAILED(widget->Create(this, aRect, &aInitData))) {
    return nullptr;
  }

  return widget.forget();
}

// Attach a view to our widget which we'll send events to.
void nsBaseWidget::AttachViewToTopLevel(bool aUseAttachedEvents) {
  NS_ASSERTION((mWindowType == WindowType::TopLevel ||
                mWindowType == WindowType::Dialog ||
                mWindowType == WindowType::Invisible ||
                mWindowType == WindowType::Child),
               "Can't attach to window of that type");

  mUseAttachedEvents = aUseAttachedEvents;
}

nsIWidgetListener* nsBaseWidget::GetAttachedWidgetListener() const {
  return mAttachedWidgetListener;
}

nsIWidgetListener* nsBaseWidget::GetPreviouslyAttachedWidgetListener() {
  return mPreviouslyAttachedWidgetListener;
}

void nsBaseWidget::SetPreviouslyAttachedWidgetListener(
    nsIWidgetListener* aListener) {
  mPreviouslyAttachedWidgetListener = aListener;
}

void nsBaseWidget::SetAttachedWidgetListener(nsIWidgetListener* aListener) {
  mAttachedWidgetListener = aListener;
}

//-------------------------------------------------------------------------
//
// Close this nsBaseWidget
//
//-------------------------------------------------------------------------
void nsBaseWidget::Destroy() {
  DestroyCompositor();

  // Just in case our parent is the only ref to us
  nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
  // disconnect from the parent
  if (mParent) {
    mParent->RemoveFromChildList(this);
    mParent = nullptr;
  }
  // disconnect from the children
  RemoveAllChildren();
}

nsIWidget* nsIWidget::GetTopLevelWidget() {
  auto* cur = this;
  while (true) {
    if (cur->IsTopLevelWidget()) {
      break;
    }
    nsIWidget* parent = cur->GetParent();
    if (!parent) {
      break;
    }
    cur = parent;
  }
  return cur;
}

float nsBaseWidget::GetDPI() { return 96.0f; }

void nsBaseWidget::NotifyAPZOfDPIChange() {
  if (mAPZC) {
    mAPZC->SetDPI(GetDPI());
  }
}

CSSToLayoutDeviceScale nsIWidget::GetDefaultScale() {
  double devPixelsPerCSSPixel = StaticPrefs::layout_css_devPixelsPerPx();

  if (devPixelsPerCSSPixel <= 0.0) {
    devPixelsPerCSSPixel = GetDefaultScaleInternal();
  }

  return CSSToLayoutDeviceScale(devPixelsPerCSSPixel);
}

nsIntSize nsIWidget::CustomCursorSize(const Cursor& aCursor) {
  MOZ_ASSERT(aCursor.IsCustom());
  int32_t width = 0;
  int32_t height = 0;
  aCursor.mContainer->GetWidth(&width);
  aCursor.mContainer->GetHeight(&height);
  aCursor.mResolution.ApplyTo(width, height);
  return {width, height};
}

LayoutDeviceIntSize nsIWidget::ClientToWindowSizeDifference() {
  auto margin = ClientToWindowMargin();
  MOZ_ASSERT(margin.top >= 0, "Window should be bigger than client area");
  MOZ_ASSERT(margin.left >= 0, "Window should be bigger than client area");
  MOZ_ASSERT(margin.right >= 0, "Window should be bigger than client area");
  MOZ_ASSERT(margin.bottom >= 0, "Window should be bigger than client area");
  return {margin.LeftRight(), margin.TopBottom()};
}

RefPtr<mozilla::VsyncDispatcher> nsIWidget::GetVsyncDispatcher() {
  return nullptr;
}

//-------------------------------------------------------------------------
//
// Add a child to the list of children
//
//-------------------------------------------------------------------------
void nsIWidget::AddToChildList(nsIWidget* aChild) {
  MOZ_ASSERT(!aChild->GetNextSibling() && !aChild->GetPrevSibling(),
             "aChild not properly removed from its old child list");

  if (!mFirstChild) {
    mFirstChild = mLastChild = aChild;
  } else {
    // append to the list
    MOZ_ASSERT(mLastChild);
    MOZ_ASSERT(!mLastChild->GetNextSibling());
    mLastChild->SetNextSibling(aChild);
    aChild->SetPrevSibling(mLastChild);
    mLastChild = aChild;
  }
}

//-------------------------------------------------------------------------
//
// Remove a child from the list of children
//
//-------------------------------------------------------------------------
void nsIWidget::RemoveFromChildList(nsIWidget* aChild) {
  MOZ_ASSERT(aChild->GetParent() == this, "Not one of our kids!");

  if (mLastChild == aChild) {
    mLastChild = mLastChild->GetPrevSibling();
  }
  if (mFirstChild == aChild) {
    mFirstChild = mFirstChild->GetNextSibling();
  }

  // Now remove from the list.  Make sure that we pass ownership of the tail
  // of the list correctly before we have aChild let go of it.
  nsIWidget* prev = aChild->GetPrevSibling();
  nsIWidget* next = aChild->GetNextSibling();
  if (prev) {
    prev->SetNextSibling(next);
  }
  if (next) {
    next->SetPrevSibling(prev);
  }

  aChild->SetNextSibling(nullptr);
  aChild->SetPrevSibling(nullptr);
}

void nsBaseWidget::GetWorkspaceID(nsAString& workspaceID) {
  workspaceID.Truncate();
}

void nsBaseWidget::MoveToWorkspace(const nsAString& workspaceID) {
  // Noop.
}

//-------------------------------------------------------------------------
//
// Get this component cursor
//
//-------------------------------------------------------------------------

void nsBaseWidget::SetCursor(const Cursor& aCursor) { mCursor = aCursor; }

void nsBaseWidget::SetCustomCursorAllowed(bool aIsAllowed) {
  if (aIsAllowed != mCustomCursorAllowed) {
    mCustomCursorAllowed = aIsAllowed;
    mUpdateCursor = true;
    SetCursor(mCursor);
  }
}

//-------------------------------------------------------------------------
//
// Window transparency methods
//
//-------------------------------------------------------------------------

void nsBaseWidget::SetTransparencyMode(TransparencyMode aMode) {}

TransparencyMode nsBaseWidget::GetTransparencyMode() {
  return TransparencyMode::Opaque;
}

/* virtual */
void nsBaseWidget::PerformFullscreenTransition(FullscreenTransitionStage aStage,
                                               uint16_t aDuration,
                                               nsISupports* aData,
                                               nsIRunnable* aCallback) {
  MOZ_ASSERT_UNREACHABLE(
      "Should never call PerformFullscreenTransition on nsBaseWidget");
}

//-------------------------------------------------------------------------
//
// Put the window into full-screen mode
//
//-------------------------------------------------------------------------
void nsBaseWidget::InfallibleMakeFullScreen(bool aFullScreen) {
#define MOZ_FORMAT_RECT(fmtstr) "[" fmtstr "," fmtstr " " fmtstr "x" fmtstr "]"
#define MOZ_SPLAT_RECT(rect) \
  (rect).X(), (rect).Y(), (rect).Width(), (rect).Height()

  // Windows which can be made fullscreen are exactly those which are located on
  // the desktop, rather than being a child of some other window.
  MOZ_DIAGNOSTIC_ASSERT(BoundsUseDesktopPixels(),
                        "non-desktop windows cannot be made fullscreen");

  // Ensure that the OS chrome is hidden/shown before we resize and/or exit the
  // function.
  //
  // HideWindowChrome() may (depending on platform, implementation details, and
  // OS-level user preferences) alter the reported size of the window. The
  // obvious and principled solution is socks-and-shoes:
  //   - On entering fullscreen mode: hide window chrome, then perform resize.
  //   - On leaving fullscreen mode: unperform resize, then show window chrome.
  //
  // ... unfortunately, HideWindowChrome() requires Resize() to be called
  // afterwards (see bug 498835), which prevents this from being done in a
  // straightforward way.
  //
  // Instead, we always call HideWindowChrome() just before we call Resize().
  // This at least ensures that our measurements are consistently taken in a
  // pre-transition state.
  //
  // ... unfortunately again, coupling HideWindowChrome() to Resize() means that
  // we have to worry about the possibility of control flows that don't call
  // Resize() at all. (That shouldn't happen, but it's not trivial to rule out.)
  // We therefore set up a fallback to fix up the OS chrome if it hasn't been
  // done at exit time.
  bool hasAdjustedOSChrome = false;
  const auto adjustOSChrome = [&]() {
    if (hasAdjustedOSChrome) {
      MOZ_ASSERT_UNREACHABLE("window chrome should only be adjusted once");
      return;
    }
    HideWindowChrome(aFullScreen);
    hasAdjustedOSChrome = true;
  };
  const auto adjustChromeOnScopeExit = MakeScopeExit([&]() {
    if (hasAdjustedOSChrome) {
      return;
    }

    MOZ_LOG(sBaseWidgetLog, LogLevel::Warning,
            ("window was not resized within InfallibleMakeFullScreen()"));

    // Hide chrome and "resize" the window to its current size.
    auto rect = GetBounds();
    adjustOSChrome();
    Resize(rect.X(), rect.Y(), rect.Width(), rect.Height(), true);
  });

  // Attempt to resize to `rect`.
  //
  // Returns the actual rectangle resized to. (This may differ from `rect`, if
  // the OS is unhappy with it. See bug 1786226.)
  const auto doReposition = [&](auto rect) -> void {
    static_assert(std::is_base_of_v<DesktopPixel,
                                    std::remove_reference_t<decltype(rect)>>,
                  "doReposition requires a rectangle using desktop pixels");

    if (MOZ_LOG_TEST(sBaseWidgetLog, LogLevel::Debug)) {
      const DesktopRect previousSize =
          GetScreenBounds() / GetDesktopToDeviceScale();
      MOZ_LOG(sBaseWidgetLog, LogLevel::Debug,
              ("before resize: " MOZ_FORMAT_RECT("%f"),
               MOZ_SPLAT_RECT(previousSize)));
    }

    adjustOSChrome();
    Resize(rect.X(), rect.Y(), rect.Width(), rect.Height(), true);

    if (MOZ_LOG_TEST(sBaseWidgetLog, LogLevel::Warning)) {
      // `rect` may have any underlying data type; coerce to float to
      // simplify printf-style logging
      const gfx::RectTyped<DesktopPixel, float> rectAsFloat{rect};

      // The OS may have objected to the target position. That's not necessarily
      // a problem -- it'll happen regularly on Macs with camera notches in the
      // monitor, for instance (see bug 1786226) -- but it probably deserves to
      // be called out.
      //
      // Since there's floating-point math involved, the actual values may be
      // off by a few ulps -- as an upper bound, perhaps 8 * FLT_EPSILON *
      // max(MOZ_SPLAT_RECT(rect)) -- but 0.01 should be several orders of
      // magnitude bigger than that.

      const auto postResizeRectRaw = GetScreenBounds();
      const auto postResizeRect = postResizeRectRaw / GetDesktopToDeviceScale();
      const bool succeeded = postResizeRect.WithinEpsilonOf(rectAsFloat, 0.01);

      if (succeeded) {
        MOZ_LOG(sBaseWidgetLog, LogLevel::Debug,
                ("resized to: " MOZ_FORMAT_RECT("%f"),
                 MOZ_SPLAT_RECT(rectAsFloat)));
      } else {
        MOZ_LOG(sBaseWidgetLog, LogLevel::Warning,
                ("attempted to resize to: " MOZ_FORMAT_RECT("%f"),
                 MOZ_SPLAT_RECT(rectAsFloat)));
        MOZ_LOG(sBaseWidgetLog, LogLevel::Warning,
                ("... but ended up at: " MOZ_FORMAT_RECT("%f"),
                 MOZ_SPLAT_RECT(postResizeRect)));
      }

      MOZ_LOG(
          sBaseWidgetLog, LogLevel::Verbose,
          ("(... which, before DPI adjustment, is:" MOZ_FORMAT_RECT("%d") ")",
           MOZ_SPLAT_RECT(postResizeRectRaw)));
    }
  };

  if (aFullScreen) {
    if (!mSavedBounds) {
      mSavedBounds = Some(FullscreenSavedState());
    }
    // save current position
    mSavedBounds->windowRect = GetScreenBounds() / GetDesktopToDeviceScale();

    nsCOMPtr<nsIScreen> screen = GetWidgetScreen();
    if (!screen) {
      return;
    }

    // Move to fill the screen.
    doReposition(screen->GetRectDisplayPix());
    // Save off the new position. (This may differ from GetRectDisplayPix(), if
    // the OS was unhappy with it. See bug 1786226.)
    mSavedBounds->screenRect = GetScreenBounds() / GetDesktopToDeviceScale();
  } else {
    if (!mSavedBounds) {
      // This should never happen, at present, since we don't make windows
      // fullscreen at their creation time; but it's not logically impossible.
      MOZ_ASSERT(false, "fullscreen window did not have saved position");
      return;
    }

    // Figure out where to go from here.
    //
    // Fortunately, since we're currently fullscreen (and other code should be
    // handling _keeping_ us fullscreen even after display-layout changes),
    // there's an obvious choice for which display we should attach to; all we
    // need to determine is where on that display we should go.

    const DesktopRect currentWinRect =
        GetScreenBounds() / GetDesktopToDeviceScale();

    // Optimization: if where we are is where we were, then where we originally
    // came from is where we're going to go.
    if (currentWinRect == DesktopRect(mSavedBounds->screenRect)) {
      MOZ_LOG(sBaseWidgetLog, LogLevel::Debug,
              ("no location change detected; returning to saved location"));
      doReposition(mSavedBounds->windowRect);
      return;
    }

    /*
      General case: figure out where we're going to go by dividing where we are
      by where we were, and then multiplying by where we originally came from.

      Less abstrusely: resize so that we occupy the same proportional position
      on our current display after leaving fullscreen as we occupied on our
      previous display before entering fullscreen.

      (N.B.: We do not clamp. If we were only partially on the old display,
      we'll be only partially on the new one, too.)
    */

    MOZ_LOG(sBaseWidgetLog, LogLevel::Debug,
            ("location change detected; computing new destination"));

    // splat: convert an arbitrary Rect into a tuple, for syntactic convenience.
    const auto splat = [](auto rect) {
      return std::tuple(rect.X(), rect.Y(), rect.Width(), rect.Height());
    };

    // remap: find the unique affine mapping which transforms `src` to `dst`,
    // and apply it to `val`.
    using Range = std::pair<float, float>;
    const auto remap = [](Range dst, Range src, float val) {
      // linear interpolation and its inverse: lerp(a, b, invlerp(a, b, t)) == t
      const auto lerp = [](float lo, float hi, float t) {
        return lo + t * (hi - lo);
      };
      const auto invlerp = [](float lo, float hi, float mid) {
        return (mid - lo) / (hi - lo);
      };

      const auto [dst_a, dst_b] = dst;
      const auto [src_a, src_b] = src;
      return lerp(dst_a, dst_b, invlerp(src_a, src_b, val));
    };

    // original position
    const auto [px, py, pw, ph] = splat(mSavedBounds->windowRect);
    // source desktop rect
    const auto [sx, sy, sw, sh] = splat(mSavedBounds->screenRect);
    // target desktop rect
    const auto [tx, ty, tw, th] = splat(currentWinRect);

    const float nx = remap({tx, tx + tw}, {sx, sx + sw}, px);
    const float ny = remap({ty, ty + th}, {sy, sy + sh}, py);
    const float nw = remap({0, tw}, {0, sw}, pw);
    const float nh = remap({0, th}, {0, sh}, ph);

    doReposition(DesktopRect{nx, ny, nw, nh});
  }

#undef MOZ_SPLAT_RECT
#undef MOZ_FORMAT_RECT
}

nsresult nsBaseWidget::MakeFullScreen(bool aFullScreen) {
  InfallibleMakeFullScreen(aFullScreen);
  return NS_OK;
}

nsBaseWidget::AutoLayerManagerSetup::AutoLayerManagerSetup(
    nsBaseWidget* aWidget, gfxContext* aTarget, BufferMode aDoubleBuffering)
    : mWidget(aWidget) {
  WindowRenderer* renderer = mWidget->GetWindowRenderer();
  if (renderer->AsFallback()) {
    mRenderer = renderer->AsFallback();
    mRenderer->SetTarget(aTarget, aDoubleBuffering);
  }
}

nsBaseWidget::AutoLayerManagerSetup::~AutoLayerManagerSetup() {
  if (mRenderer) {
    mRenderer->SetTarget(nullptr, mozilla::layers::BufferMode::BUFFER_NONE);
  }
}

bool nsBaseWidget::IsSmallPopup() const {
  return mWindowType == WindowType::Popup && mPopupType != PopupType::Panel;
}

bool nsBaseWidget::ComputeShouldAccelerate() {
  return gfx::gfxConfig::IsEnabled(gfx::Feature::HW_COMPOSITING) &&
         (WidgetTypeSupportsAcceleration() ||
          StaticPrefs::gfx_webrender_unaccelerated_widget_force());
}

bool nsBaseWidget::UseAPZ() const {
  // APZ disabled globally
  if (!gfxPlatform::AsyncPanZoomEnabled()) {
    return false;
  }

  // Always use APZ for top-level windows
  if (mWindowType == WindowType::TopLevel || mWindowType == WindowType::Child) {
    return true;
  }

  // Never use APZ for tooltips
  if (mWindowType == WindowType::Popup && mPopupType == PopupType::Tooltip) {
    return false;
  }

  if (!StaticPrefs::apz_popups_enabled()) {
    return false;
  }

  if (HasRemoteContent()) {
    return mWindowType == WindowType::Dialog ||
           mWindowType == WindowType::Popup;
  } else if (StaticPrefs::apz_popups_without_remote_enabled()) {
    return mWindowType == WindowType::Popup;
  }

  return false;
}

void nsBaseWidget::CreateCompositor() {
  LayoutDeviceIntRect rect = GetBounds();
  CreateCompositor(rect.Width(), rect.Height());
}

void nsIWidget::PauseOrResumeCompositor(bool aPause) {
  auto* renderer = GetRemoteRenderer();
  if (!renderer) {
    return;
  }
  if (aPause) {
    renderer->SendPause();
  } else {
    renderer->SendResume();
  }
}

already_AddRefed<GeckoContentController>
nsBaseWidget::CreateRootContentController() {
  RefPtr<GeckoContentController> controller =
      new ChromeProcessController(this, mAPZEventState, mAPZC);
  return controller.forget();
}

void nsBaseWidget::ConfigureAPZCTreeManager() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mAPZC);

  mAPZC->SetDPI(GetDPI());

  if (StaticPrefs::apz_keyboard_enabled_AtStartup()) {
    KeyboardMap map = RootWindowGlobalKeyListener::CollectKeyboardShortcuts();
    mAPZC->SetKeyboardMap(map);
  }

  ContentReceivedInputBlockCallback callback(
      [treeManager = RefPtr{mAPZC.get()}](uint64_t aInputBlockId,
                                          bool aPreventDefault) {
        MOZ_ASSERT(NS_IsMainThread());
        treeManager->ContentReceivedInputBlock(aInputBlockId, aPreventDefault);
      });
  mAPZEventState = new APZEventState(this, std::move(callback));

  mRootContentController = CreateRootContentController();
  if (mRootContentController) {
    mCompositorSession->SetContentController(mRootContentController);
  }

  // When APZ is enabled, we can actually enable raw touch events because we
  // have code that can deal with them properly. If APZ is not enabled, this
  // function doesn't get called.
  if (StaticPrefs::dom_w3c_touch_events_enabled()) {
    RegisterTouchWindow();
  }
}

void nsBaseWidget::ConfigureAPZControllerThread() {
  // By default the controller thread is the main thread.
  APZThreadUtils::SetControllerThread(NS_GetCurrentThread());
}

void nsBaseWidget::SetConfirmedTargetAPZC(
    uint64_t aInputBlockId,
    const nsTArray<ScrollableLayerGuid>& aTargets) const {
  mAPZC->SetTargetAPZC(aInputBlockId, aTargets);
}

void nsBaseWidget::UpdateZoomConstraints(
    const uint32_t& aPresShellId, const ScrollableLayerGuid::ViewID& aViewId,
    const Maybe<ZoomConstraints>& aConstraints) {
  if (!mCompositorSession || !mAPZC) {
    MOZ_ASSERT_IF(mInitialZoomConstraints,
                  mInitialZoomConstraints->mViewID == aViewId);
    if (aConstraints) {
      // We have some constraints, but the compositor and APZC aren't
      // created yet. Save these so we can use them later.
      mInitialZoomConstraints = Some(
          InitialZoomConstraints(aPresShellId, aViewId, aConstraints.ref()));
    } else {
      mInitialZoomConstraints.reset();
    }
    return;
  }
  LayersId layersId = mCompositorSession->RootLayerTreeId();
  mAPZC->UpdateZoomConstraints(
      ScrollableLayerGuid(layersId, aPresShellId, aViewId), aConstraints);
}

bool nsBaseWidget::AsyncPanZoomEnabled() const { return !!mAPZC; }

nsEventStatus nsBaseWidget::ProcessUntransformedAPZEvent(
    WidgetInputEvent* aEvent, const APZEventResult& aApzResult) {
  MOZ_ASSERT(NS_IsMainThread());
  ScrollableLayerGuid targetGuid = aApzResult.mTargetGuid;
  uint64_t inputBlockId = aApzResult.mInputBlockId;
  InputAPZContext context(aApzResult.mTargetGuid, inputBlockId,
                          aApzResult.GetStatus());

  // Make a copy of the original event for the APZCCallbackHelper helpers that
  // we call later, because the event passed to DispatchEvent can get mutated in
  // ways that we don't want (i.e. touch points can get stripped out).
  nsEventStatus status;
  UniquePtr<WidgetEvent> original(aEvent->Duplicate());
  DispatchEvent(aEvent, status);

  if (mAPZC && !InputAPZContext::WasRoutedToChildProcess() &&
      !InputAPZContext::WasDropped() && inputBlockId) {
    // EventStateManager did not route the event into the child process and
    // the event was dispatched in the parent process.
    // It's safe to communicate to APZ that the event has been processed.
    // Note that here aGuid.mLayersId might be different from
    // mCompositorSession->RootLayerTreeId() because the event might have gotten
    // hit-tested by APZ to be targeted at a child process, but a parent process
    // event listener called preventDefault on it. In that case aGuid.mLayersId
    // would still be the layers id for the child process, but the event would
    // not have actually gotten routed to the child process. The main-thread
    // hit-test result therefore needs to use the parent process layers id.
    LayersId rootLayersId = mCompositorSession->RootLayerTreeId();

    RefPtr<DisplayportSetListener> postLayerization;
    if (WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent()) {
      nsTArray<TouchBehaviorFlags> allowedTouchBehaviors;
      if (touchEvent->mMessage == eTouchStart) {
        auto& originalEvent = *original->AsTouchEvent();
        MOZ_ASSERT(NS_IsMainThread());
        allowedTouchBehaviors = TouchActionHelper::GetAllowedTouchBehavior(
            this, GetDocument(), originalEvent);
        if (!allowedTouchBehaviors.IsEmpty()) {
          mAPZC->SetAllowedTouchBehavior(inputBlockId, allowedTouchBehaviors);
        }
        postLayerization = APZCCallbackHelper::SendSetTargetAPZCNotification(
            this, GetDocument(), originalEvent, rootLayersId, inputBlockId);
      }
      mAPZEventState->ProcessTouchEvent(*touchEvent, targetGuid, inputBlockId,
                                        aApzResult.GetStatus(), status,
                                        std::move(allowedTouchBehaviors));
    } else if (WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent()) {
      MOZ_ASSERT(wheelEvent->mFlags.mHandledByAPZ);
      postLayerization = APZCCallbackHelper::SendSetTargetAPZCNotification(
          this, GetDocument(), *original->AsWheelEvent(), rootLayersId,
          inputBlockId);
      if (wheelEvent->mCanTriggerSwipe) {
        ReportSwipeStarted(inputBlockId, wheelEvent->TriggersSwipe());
      }
      mAPZEventState->ProcessWheelEvent(*wheelEvent, inputBlockId);
    } else if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
      MOZ_ASSERT(mouseEvent->mFlags.mHandledByAPZ);
      postLayerization = APZCCallbackHelper::SendSetTargetAPZCNotification(
          this, GetDocument(), *original->AsMouseEvent(), rootLayersId,
          inputBlockId);
      mAPZEventState->ProcessMouseEvent(*mouseEvent, inputBlockId);
    }
    if (postLayerization) {
      postLayerization->Register();
    }
  }

  return status;
}

template <class InputType, class EventType>
class DispatchEventOnMainThread : public Runnable {
public:
  DispatchEventOnMainThread(const InputType& aInput, nsBaseWidget* aWidget,
                            const APZEventResult& aAPZResult)
      : mozilla::Runnable("DispatchEventOnMainThread"),
        mInput(aInput),
        mWidget(aWidget),
        mAPZResult(aAPZResult) {}

  NS_IMETHOD Run() override {
    EventType event = mInput.ToWidgetEvent(mWidget);
    mWidget->ProcessUntransformedAPZEvent(&event, mAPZResult);
    return NS_OK;
  }

private:
  InputType mInput;
  nsBaseWidget* mWidget;
  APZEventResult mAPZResult;
};

template <>
NS_IMETHODIMP DispatchEventOnMainThread<MouseInput, WidgetMouseEvent>::Run() {
  MOZ_ASSERT(
      !mInput.IsPointerEventType(),
      "Please use DispatchEventOnMainThread");
  WidgetMouseEvent event = mInput.ToWidgetEvent<WidgetMouseEvent>(mWidget);
  mWidget->ProcessUntransformedAPZEvent(&event, mAPZResult);
  return NS_OK;
}

template <>
NS_IMETHODIMP DispatchEventOnMainThread<MouseInput, WidgetPointerEvent>::Run() {
  MOZ_ASSERT(
      mInput.IsPointerEventType(),
      "Please use DispatchEventOnMainThread");
  WidgetPointerEvent event = mInput.ToWidgetEvent<WidgetPointerEvent>(mWidget);
  mWidget->ProcessUntransformedAPZEvent(&event, mAPZResult);
  return NS_OK;
}

template <class InputType, class EventType>
class DispatchInputOnControllerThread : public Runnable {
public:
  enum class APZOnly { Yes, No };
  DispatchInputOnControllerThread(const EventType& aEvent,
                                  IAPZCTreeManager* aAPZC,
                                  nsBaseWidget* aWidget,
                                  APZOnly aAPZOnly = APZOnly::No)
      : mozilla::Runnable("DispatchInputOnControllerThread"),
        mMainMessageLoop(MessageLoop::current()),
        mInput(aEvent),
        mAPZC(aAPZC),
        mWidget(aWidget),
        mAPZOnly(aAPZOnly) {}

  NS_IMETHOD Run() override {
    APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(mInput);
    if (mAPZOnly == APZOnly::Yes ||
        result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      return NS_OK;
    }
    RefPtr<Runnable> r = new DispatchEventOnMainThread<InputType, EventType>(
        mInput, mWidget, result);
    mMainMessageLoop->PostTask(r.forget());
    return NS_OK;
  }

private:
  MessageLoop* mMainMessageLoop;
  InputType mInput;
  RefPtr<IAPZCTreeManager> mAPZC;
  nsBaseWidget* mWidget;
  const APZOnly mAPZOnly;
};

void nsBaseWidget::DispatchTouchInput(MultiTouchInput& aInput,
                                      uint16_t aInputSource) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aInputSource ==
                 mozilla::dom::MouseEvent_Binding::MOZ_SOURCE_TOUCH ||
             aInputSource == mozilla::dom::MouseEvent_Binding::MOZ_SOURCE_PEN);
  if (mAPZC) {
    MOZ_ASSERT(APZThreadUtils::IsControllerThread());

    APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(aInput);
    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      return;
    }

    WidgetTouchEvent event = aInput.ToWidgetEvent(this, aInputSource);
    ProcessUntransformedAPZEvent(&event, result);
  } else {
    WidgetTouchEvent event = aInput.ToWidgetEvent(this, aInputSource);

    nsEventStatus status;
    DispatchEvent(&event, status);
  }
}

void nsBaseWidget::DispatchPanGestureInput(PanGestureInput& aInput) {
  MOZ_ASSERT(NS_IsMainThread());
  if (mAPZC) {
    MOZ_ASSERT(APZThreadUtils::IsControllerThread());

    APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(aInput);
    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      return;
    }

    WidgetWheelEvent event = aInput.ToWidgetEvent(this);
    ProcessUntransformedAPZEvent(&event, result);
  } else {
    WidgetWheelEvent event = aInput.ToWidgetEvent(this);
    nsEventStatus status;
    DispatchEvent(&event, status);
  }
}

void nsBaseWidget::DispatchPinchGestureInput(PinchGestureInput& aInput) {
  MOZ_ASSERT(NS_IsMainThread());
  if (mAPZC) {
    MOZ_ASSERT(APZThreadUtils::IsControllerThread());
    APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(aInput);

    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      return;
    }
    WidgetWheelEvent event = aInput.ToWidgetEvent(this);
    ProcessUntransformedAPZEvent(&event, result);
  } else {
    WidgetWheelEvent event = aInput.ToWidgetEvent(this);
    nsEventStatus status;
    DispatchEvent(&event, status);
  }
}

nsIWidget::ContentAndAPZEventStatus nsBaseWidget::DispatchInputEvent(
    WidgetInputEvent* aEvent) {
  nsIWidget::ContentAndAPZEventStatus status;
  MOZ_ASSERT(NS_IsMainThread());

  if (mAPZC) {
    if (APZThreadUtils::IsControllerThread()) {
      APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(*aEvent);
      status.mApzStatus = result.GetStatus();
      if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
        return status;
      }
      status.mContentStatus = ProcessUntransformedAPZEvent(aEvent, result);
      return status;
    }
    // Most drag events aren't able to converted to MouseEvent except to
    // eDragStart and eDragEnd.
    const bool canDispatchToApzc =
        !aEvent->AsDragEvent() ||
        aEvent->AsDragEvent()->CanConvertToInputData();
    if (canDispatchToApzc) {
      if (WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent()) {
        RefPtr<Runnable> r =
            new DispatchInputOnControllerThread<ScrollWheelInput,
                                                WidgetWheelEvent>(*wheelEvent,
                                                                  mAPZC, this);
        APZThreadUtils::RunOnControllerThread(std::move(r));
        status.mContentStatus = nsEventStatus_eConsumeDoDefault;
        return status;
      }
      if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
        MOZ_ASSERT(aEvent->mMessage == eContextMenu);
        RefPtr<Runnable> r =
            new DispatchInputOnControllerThread<MouseInput, WidgetPointerEvent>(
                *pointerEvent, mAPZC, this);
        APZThreadUtils::RunOnControllerThread(std::move(r));
        status.mContentStatus = nsEventStatus_eConsumeDoDefault;
        return status;
      }
      if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
        RefPtr<Runnable> r =
            new DispatchInputOnControllerThread<MouseInput, WidgetMouseEvent>(
                *mouseEvent, mAPZC, this);
        APZThreadUtils::RunOnControllerThread(std::move(r));
        status.mContentStatus = nsEventStatus_eConsumeDoDefault;
        return status;
      }
      if (WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent()) {
        RefPtr<Runnable> r =
            new DispatchInputOnControllerThread<MultiTouchInput,
                                                WidgetTouchEvent>(*touchEvent,
                                                                  mAPZC, this);
        APZThreadUtils::RunOnControllerThread(std::move(r));
        status.mContentStatus = nsEventStatus_eConsumeDoDefault;
        return status;
      }
      // Allow dispatching keyboard/drag events on Gecko thread
      // without sending them to APZ

      // FIXME: APZ can handle keyboard events now, we should
      // be sending them to APZ here
      MOZ_ASSERT(aEvent->AsKeyboardEvent() || aEvent->AsDragEvent());
    }
  }

  DispatchEvent(aEvent, status.mContentStatus);
  return status;
}

void nsBaseWidget::DispatchEventToAPZOnly(mozilla::WidgetInputEvent* aEvent) {
  MOZ_ASSERT(NS_IsMainThread());
  if (mAPZC) {
    if (APZThreadUtils::IsControllerThread()) {
      mAPZC->InputBridge()->ReceiveInputEvent(*aEvent);
      return;
    }

    if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
      RefPtr<Runnable> r =
          new DispatchInputOnControllerThread<MouseInput, WidgetMouseEvent>(
              *mouseEvent, mAPZC, this,
              DispatchInputOnControllerThread<MouseInput,
                                              WidgetMouseEvent>::APZOnly::Yes);
      APZThreadUtils::RunOnControllerThread(std::move(r));
      return;
    }

    MOZ_ASSERT_UNREACHABLE("Not implemented yet");
  }
}

bool nsBaseWidget::DispatchWindowEvent(WidgetGUIEvent& event) {
  nsEventStatus status;
  DispatchEvent(&event, status);
  return ConvertStatus(status);
}

Document* nsBaseWidget::GetDocument() const {
  if (mWidgetListener) {
    if (PresShell* presShell = mWidgetListener->GetPresShell()) {
      return presShell->GetDocument();
    }
  }
  return nullptr;
}

void nsBaseWidget::CreateCompositorVsyncDispatcher() {
  // Parent directly listens to the vsync source whereas
  // child process communicate via IPC
  // Should be called AFTER gfxPlatform is initialized
  if (XRE_IsParentProcess()) {
    if (!mCompositorVsyncDispatcherLock) {
      mCompositorVsyncDispatcherLock =
          MakeUnique<Mutex>("mCompositorVsyncDispatcherLock");
    }
    MutexAutoLock lock(*mCompositorVsyncDispatcherLock.get());
    if (!mCompositorVsyncDispatcher) {
      RefPtr<VsyncDispatcher> vsyncDispatcher =
          gfxPlatform::GetPlatform()->GetGlobalVsyncDispatcher();
      mCompositorVsyncDispatcher =
          new CompositorVsyncDispatcher(std::move(vsyncDispatcher));
    }
  }
}

already_AddRefed<CompositorVsyncDispatcher>
nsBaseWidget::GetCompositorVsyncDispatcher() {
  MOZ_ASSERT(mCompositorVsyncDispatcherLock.get());

  MutexAutoLock lock(*mCompositorVsyncDispatcherLock.get());
  RefPtr<CompositorVsyncDispatcher> dispatcher = mCompositorVsyncDispatcher;
  return dispatcher.forget();
}

already_AddRefed<WebRenderLayerManager> nsBaseWidget::CreateCompositorSession(
    int aWidth, int aHeight, CompositorOptions* aOptionsOut) {
  MOZ_ASSERT(aOptionsOut);

  do {
    CreateCompositorVsyncDispatcher();

    gfx::GPUProcessManager* gpu = gfx::GPUProcessManager::Get();
    // Make sure GPU process is ready for use.
    // If it failed to connect to GPU process, GPU process usage is disabled in
    // EnsureGPUReady(). It could update gfxVars and gfxConfigs.
    nsresult rv = gpu->EnsureGPUReady();
    if (NS_WARN_IF(rv == NS_ERROR_ILLEGAL_DURING_SHUTDOWN)) {
      return nullptr;
    }

    // If widget type does not supports acceleration, we may be allowed to use
    // software WebRender instead.
    bool supportsAcceleration = WidgetTypeSupportsAcceleration();
    bool enableSWWR = true;
    if (supportsAcceleration ||
        StaticPrefs::gfx_webrender_unaccelerated_widget_force()) {
      enableSWWR = gfx::gfxVars::UseSoftwareWebRender();
    }
    bool enableAPZ = UseAPZ();
    CompositorOptions options(enableAPZ, enableSWWR);

#ifdef XP_WIN
    if (supportsAcceleration) {
      options.SetAllowSoftwareWebRenderD3D11(
          gfx::gfxVars::AllowSoftwareWebRenderD3D11());
    }
    if (mNeedFastSnaphot) {
      options.SetNeedFastSnaphot(true);
    }
#elif defined(MOZ_WIDGET_ANDROID)
    MOZ_ASSERT(supportsAcceleration);
    options.SetAllowSoftwareWebRenderOGL(
        gfx::gfxVars::AllowSoftwareWebRenderOGL());
#elif defined(MOZ_WIDGET_GTK)
    if (supportsAcceleration) {
      options.SetAllowSoftwareWebRenderOGL(
          gfx::gfxVars::AllowSoftwareWebRenderOGL());
    }
#endif

#ifdef MOZ_WIDGET_ANDROID
    // Unconditionally set the compositor as initially paused, as we have not
    // yet had a chance to send the compositor surface to the GPU process. We
    // will do so shortly once we have returned to nsWindow::CreateLayerManager,
    // where we will also resume the compositor if required.
    options.SetInitiallyPaused(true);
#else
    options.SetInitiallyPaused(CompositorInitiallyPaused());
#endif

    RefPtr<WebRenderLayerManager> lm = new WebRenderLayerManager(this);

    uint64_t innerWindowId = 0;
    if (Document* doc = GetDocument()) {
      innerWindowId = doc->InnerWindowID();
    }

    bool retry = false;
    mCompositorSession = gpu->CreateTopLevelCompositor(
        this, lm, GetDefaultScale(), options, UseExternalCompositingSurface(),
        gfx::IntSize(aWidth, aHeight), innerWindowId, &retry);

    if (mCompositorSession) {
      TextureFactoryIdentifier textureFactoryIdentifier;
      nsCString error;
      lm->Initialize(mCompositorSession->GetCompositorBridgeChild(),
                     wr::AsPipelineId(mCompositorSession->RootLayerTreeId()),
                     &textureFactoryIdentifier, error);
      if (textureFactoryIdentifier.mParentBackend != LayersBackend::LAYERS_WR) {
        retry = true;
        DestroyCompositor();
        // gfxVars::UseDoubleBufferingWithCompositor() is also disabled.
        gfx::GPUProcessManager::Get()->DisableWebRender(
            wr::WebRenderError::INITIALIZE, error);
      }
    }

    // We need to retry in a loop because the act of failing to create the
    // compositor can change our state (e.g. disable WebRender).
    if (mCompositorSession || !retry) {
      *aOptionsOut = options;
      return lm.forget();
    }
  } while (true);
}

void nsBaseWidget::CreateCompositor(int aWidth, int aHeight) {
  // This makes sure that gfxPlatforms gets initialized if it hasn't by now.
  gfxPlatform::GetPlatform();

  MOZ_ASSERT(gfxPlatform::UsesOffMainThreadCompositing(),
             "This function assumes OMTC");

  MOZ_ASSERT(!mCompositorSession && !mCompositorBridgeChild,
             "Should have properly cleaned up the previous PCompositor pair "
             "beforehand");

  if (mCompositorBridgeChild) {
    mCompositorBridgeChild->Destroy();
  }

  // Recreating this is tricky, as we may still have an old and we need
  // to make sure it's properly destroyed by calling DestroyCompositor!

  // If we've already received a shutdown notification, don't try
  // create a new compositor.
  if (!mShutdownObserver) {
    return;
  }

  // The controller thread must be configured before the compositor
  // session is created, so that the input bridge runs on the right
  // thread.
  ConfigureAPZControllerThread();

  CompositorOptions options;
  RefPtr<WebRenderLayerManager> lm =
      CreateCompositorSession(aWidth, aHeight, &options);
  if (!lm) {
    return;
  }

  MOZ_ASSERT(mCompositorSession);
  mCompositorBridgeChild = mCompositorSession->GetCompositorBridgeChild();
  SetCompositorWidgetDelegate(
      mCompositorSession->GetCompositorWidgetDelegate());

  if (options.UseAPZ()) {
    mAPZC = mCompositorSession->GetAPZCTreeManager();
    ConfigureAPZCTreeManager();
  } else {
    mAPZC = nullptr;
  }

  if (mInitialZoomConstraints) {
    UpdateZoomConstraints(mInitialZoomConstraints->mPresShellID,
                          mInitialZoomConstraints->mViewID,
                          Some(mInitialZoomConstraints->mConstraints));
    mInitialZoomConstraints.reset();
  }

  TextureFactoryIdentifier textureFactoryIdentifier =
      lm->GetTextureFactoryIdentifier();
  MOZ_ASSERT(textureFactoryIdentifier.mParentBackend ==
             LayersBackend::LAYERS_WR);
  ImageBridgeChild::IdentifyCompositorTextureHost(textureFactoryIdentifier);
  gfx::VRManagerChild::IdentifyTextureHost(textureFactoryIdentifier);

  WindowUsesOMTC();

  mWindowRenderer = std::move(lm);

  // Only track compositors for top-level windows, since other window types
  // may use the basic compositor.  Except on the OS X - see bug 1306383
#if defined(XP_MACOSX)
  bool getCompositorFromThisWindow = true;
#else
  bool getCompositorFromThisWindow = mWindowType == WindowType::TopLevel;
#endif

  if (getCompositorFromThisWindow) {
    gfxPlatform::GetPlatform()->NotifyCompositorCreated(
        mWindowRenderer->GetCompositorBackendType());
  }
}

void nsBaseWidget::NotifyCompositorSessionLost(CompositorSession* aSession) {
  MOZ_ASSERT(aSession == mCompositorSession);
  DestroyLayerManager();
}

bool nsBaseWidget::ShouldUseOffMainThreadCompositing() {
  return gfxPlatform::UsesOffMainThreadCompositing();
}

WindowRenderer* nsBaseWidget::GetWindowRenderer() {
  if (!mWindowRenderer) {
    if (!mShutdownObserver) {
      // We are shutting down, do not try to re-create a LayerManager
      return nullptr;
    }
    // Try to use an async compositor first, if possible
    if (ShouldUseOffMainThreadCompositing()) {
      CreateCompositor();
    }

    if (!mWindowRenderer) {
      mWindowRenderer = CreateFallbackRenderer();
    }
  }
  return mWindowRenderer;
}

WindowRenderer* nsBaseWidget::CreateFallbackRenderer() {
  return new FallbackRenderer;
}

CompositorBridgeChild* nsBaseWidget::GetRemoteRenderer() {
  return mCompositorBridgeChild;
}

void nsBaseWidget::ClearCachedWebrenderResources() {
  if (!mWindowRenderer || !mWindowRenderer->AsWebRender()) {
    return;
  }
  mWindowRenderer->AsWebRender()->ClearCachedResources();
}

void nsBaseWidget::ClearWebrenderAnimationResources() {
  if (!mWindowRenderer || !mWindowRenderer->AsWebRender()) {
    return;
  }
  mWindowRenderer->AsWebRender()->ClearAnimationResources();
}

bool nsBaseWidget::SetNeedFastSnaphot() {
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(!mCompositorSession);

  if (!XRE_IsParentProcess() || mCompositorSession) {
    return false;
  }

  mNeedFastSnaphot = true;
  return true;
}

already_AddRefed<gfx::DrawTarget> nsBaseWidget::StartRemoteDrawing() {
  return nullptr;
}

uint32_t nsBaseWidget::GetGLFrameBufferFormat() { return LOCAL_GL_RGBA; }

//-------------------------------------------------------------------------
//
// Destroy the window
//
//-------------------------------------------------------------------------
void nsBaseWidget::OnDestroy() {
  if (mTextEventDispatcher) {
    mTextEventDispatcher->OnDestroyWidget();
    // Don't release it until this widget actually released because after this
    // is called, TextEventDispatcher() may create it again.
  }

  // If this widget is being destroyed, let the APZ code know to drop references
  // to this widget. Callers of this function all should be holding a deathgrip
  // on this widget already.
  ReleaseContentController();
}

/* static */
DesktopIntPoint nsBaseWidget::ConstrainPositionToBounds(
    const DesktopIntPoint& aPoint, const DesktopIntSize& aSize,
    const DesktopIntRect& aScreenRect) {
  DesktopIntPoint point = aPoint;

  // The maximum position to which the window can be moved while keeping its
  // bottom-right corner within screenRect.
  auto const maxX = aScreenRect.XMost() - aSize.Width();
  auto const maxY = aScreenRect.YMost() - aSize.Height();

  // Note that the conditional-pairs below are not exclusive with each other,
  // and cannot be replaced with a simple call to `std::clamp`! If the window
  // provided is too large to fit on the screen, they will both fire. Their
  // order has been chosen to ensure that the window's top left corner will be
  // onscreen.

  if (point.x >= maxX) {
    point.x = maxX;
  }
  if (point.x < aScreenRect.x) {
    point.x = aScreenRect.x;
  }

  if (point.y >= maxY) {
    point.y = maxY;
  }
  if (point.y < aScreenRect.y) {
    point.y = aScreenRect.y;
  }

  return point;
}

void nsBaseWidget::MoveClient(const DesktopPoint& aOffset) {
  LayoutDeviceIntPoint clientOffset(GetClientOffset());

  // GetClientOffset returns device pixels; scale back to desktop pixels
  // if that's what this widget uses for the Move/Resize APIs
  if (BoundsUseDesktopPixels()) {
    DesktopPoint desktopOffset = clientOffset / GetDesktopToDeviceScale();
    Move(aOffset.x - desktopOffset.x, aOffset.y - desktopOffset.y);
  } else {
    LayoutDevicePoint layoutOffset = aOffset * GetDesktopToDeviceScale();
    Move(layoutOffset.x - LayoutDeviceCoord(clientOffset.x),
         layoutOffset.y - LayoutDeviceCoord(clientOffset.y));
  }
}

void nsBaseWidget::ResizeClient(const DesktopSize& aSize, bool aRepaint) {
  NS_ASSERTION((aSize.width >= 0), "Negative width passed to ResizeClient");
  NS_ASSERTION((aSize.height >= 0), "Negative height passed to ResizeClient");

  LayoutDeviceIntRect clientBounds = GetClientBounds();

  // GetClientBounds and mBounds are device pixels; scale back to desktop pixels
  // if that's what this widget uses for the Move/Resize APIs
  if (BoundsUseDesktopPixels()) {
    DesktopSize desktopDelta =
        (LayoutDeviceIntSize(mBounds.Width(), mBounds.Height()) -
         clientBounds.Size()) /
        GetDesktopToDeviceScale();
    Resize(aSize.width + desktopDelta.width, aSize.height + desktopDelta.height,
           aRepaint);
  } else {
    LayoutDeviceSize layoutSize = aSize * GetDesktopToDeviceScale();
    Resize(mBounds.Width() + (layoutSize.width - clientBounds.Width()),
           mBounds.Height() + (layoutSize.height - clientBounds.Height()),
           aRepaint);
  }
}

void nsBaseWidget::ResizeClient(const DesktopRect& aRect, bool aRepaint) {
  NS_ASSERTION((aRect.Width() >= 0), "Negative width passed to ResizeClient");
  NS_ASSERTION((aRect.Height() >= 0), "Negative height passed to ResizeClient");

  LayoutDeviceIntRect clientBounds = GetClientBounds();
  LayoutDeviceIntPoint clientOffset = GetClientOffset();
  DesktopToLayoutDeviceScale scale = GetDesktopToDeviceScale();

  if (BoundsUseDesktopPixels()) {
    DesktopPoint desktopOffset = clientOffset / scale;
    DesktopSize desktopDelta =
        (LayoutDeviceIntSize(mBounds.Width(), mBounds.Height()) -
         clientBounds.Size()) /
        scale;
    Resize(aRect.X() - desktopOffset.x, aRect.Y() - desktopOffset.y,
           aRect.Width() + desktopDelta.width,
           aRect.Height() + desktopDelta.height, aRepaint);
  } else {
    LayoutDeviceRect layoutRect = aRect * scale;
    Resize(layoutRect.X() - clientOffset.x, layoutRect.Y() - clientOffset.y,
           layoutRect.Width() + mBounds.Width() - clientBounds.Width(),
           layoutRect.Height() + mBounds.Height() - clientBounds.Height(),
           aRepaint);
  }
}

//-------------------------------------------------------------------------
//
// Bounds
//
//-------------------------------------------------------------------------

/**
* If the implementation of nsWindow supports borders this method MUST be
* overridden
*
**/
LayoutDeviceIntRect nsBaseWidget::GetClientBounds() { return GetBounds(); }

/**
* If the implementation of nsWindow supports borders this method MUST be
* overridden
*
**/
LayoutDeviceIntRect nsBaseWidget::GetBounds() { return mBounds; }

/**
* If the implementation of nsWindow uses a local coordinate system within the
*window, this method must be overridden
*
**/
LayoutDeviceIntRect nsBaseWidget::GetScreenBounds() { return GetBounds(); }

nsresult nsBaseWidget::GetRestoredBounds(LayoutDeviceIntRect& aRect) {
  if (SizeMode() != nsSizeMode_Normal) {
    return NS_ERROR_FAILURE;
  }
  aRect = GetScreenBounds();
  return NS_OK;
}

LayoutDeviceIntPoint nsBaseWidget::GetClientOffset() {
  return LayoutDeviceIntPoint(0, 0);
}

uint32_t nsBaseWidget::GetMaxTouchPoints() const { return 0; }

bool nsBaseWidget::HasPendingInputEvent() { return false; }

bool nsBaseWidget::ShowsResizeIndicator(LayoutDeviceIntRect* aResizerRect) {
  return false;
}

/**
* Modifies aFile to point at an icon file with the given name and suffix.  The
* suffix may correspond to a file extension with leading '.' if appropriate.
* Returns true if the icon file exists and can be read.
*/
static bool ResolveIconNameHelper(nsIFile* aFile, const nsAString& aIconName,
                                  const nsAString& aIconSuffix) {
  aFile->Append(u"icons"_ns);
  aFile->Append(u"default"_ns);
  aFile->Append(aIconName + aIconSuffix);

  bool readable;
  return NS_SUCCEEDED(aFile->IsReadable(&readable)) && readable;
}

/**
* Resolve the given icon name into a local file object.  This method is
* intended to be called by subclasses of nsBaseWidget.  aIconSuffix is a
* platform specific icon file suffix (e.g., ".ico" under Win32).
*
* If no file is found matching the given parameters, then null is returned.
*/
void nsBaseWidget::ResolveIconName(const nsAString& aIconName,
                                   const nsAString& aIconSuffix,
                                   nsIFile** aResult) {
  *aResult = nullptr;

  nsCOMPtr<nsIProperties> dirSvc =
      do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
  if (!dirSvc) return;

  // first check auxilary chrome directories

  nsCOMPtr<nsISimpleEnumerator> dirs;
  dirSvc->Get(NS_APP_CHROME_DIR_LIST, NS_GET_IID(nsISimpleEnumerator),
              getter_AddRefs(dirs));
  if (dirs) {
    bool hasMore;
    while (NS_SUCCEEDED(dirs->HasMoreElements(&hasMore)) && hasMore) {
      nsCOMPtr<nsISupports> element;
      dirs->GetNext(getter_AddRefs(element));
      if (!element) continue;
      nsCOMPtr<nsIFile> file = do_QueryInterface(element);
      if (!file) continue;
      if (ResolveIconNameHelper(file, aIconName, aIconSuffix)) {
        NS_ADDREF(*aResult = file);
        return;
      }
    }
  }

  // then check the main app chrome directory

  nsCOMPtr<nsIFile> file;
  dirSvc->Get(NS_APP_CHROME_DIR, NS_GET_IID(nsIFile), getter_AddRefs(file));
  if (file && ResolveIconNameHelper(file, aIconName, aIconSuffix))
    NS_ADDREF(*aResult = file);
}

void nsBaseWidget::SetSizeConstraints(const SizeConstraints& aConstraints) {
  mSizeConstraints = aConstraints;

  // Popups are constrained during layout, and we don't want to synchronously
  // paint from reflow, so bail out... This is not great, but it's no worse than
  // what we used to do.
  //
  // The right fix here is probably making constraint changes go through the
  // view manager and such.
  if (mWindowType == WindowType::Popup) {
    return;
  }

  // If the current size doesn't meet the new constraints, trigger a
  // resize to apply it. Note that, we don't want to invoke Resize if
  // the new constraints don't affect the current size, because Resize
  // implementation on some platforms may touch other geometry even if
  // the size don't need to change.
  LayoutDeviceIntSize curSize = mBounds.Size();
  LayoutDeviceIntSize clampedSize =
      Max(aConstraints.mMinSize, Min(aConstraints.mMaxSize, curSize));
  if (clampedSize != curSize) {
    gfx::Size size;
    if (BoundsUseDesktopPixels()) {
      DesktopSize desktopSize = clampedSize / GetDesktopToDeviceScale();
      size = desktopSize.ToUnknownSize();
    } else {
      size = gfx::Size(clampedSize.ToUnknownSize());
    }
    Resize(size.width, size.height, true);
  }
}

const widget::SizeConstraints nsBaseWidget::GetSizeConstraints() {
  return mSizeConstraints;
}

// static
nsIRollupListener* nsBaseWidget::GetActiveRollupListener() {
  // TODO: Simplify this.
  return nsXULPopupManager::GetInstance();
}

void nsBaseWidget::NotifyWindowDestroyed() {
  if (!mWidgetListener) return;

  nsCOMPtr<nsIAppWindow> window = mWidgetListener->GetAppWindow();
  nsCOMPtr<nsIBaseWindow> appWindow(do_QueryInterface(window));
  if (appWindow) {
    appWindow->Destroy();
  }
}

void nsBaseWidget::NotifyWindowMoved(int32_t aX, int32_t aY,
                                     ByMoveToRect aByMoveToRect) {
  if (mWidgetListener) {
    mWidgetListener->WindowMoved(this, aX, aY, aByMoveToRect);
  }

  if (mIMEHasFocus && IMENotificationRequestsRef().WantPositionChanged()) {
    NotifyIME(IMENotification(IMEMessage::NOTIFY_IME_OF_POSITION_CHANGE));
  }
}

void nsBaseWidget::NotifySizeMoveDone() {
  if (!mWidgetListener) {
    return;
  }
  if (PresShell* presShell = mWidgetListener->GetPresShell()) {
    presShell->WindowSizeMoveDone();
  }
}

void nsBaseWidget::NotifyThemeChanged(ThemeChangeKind aKind) {
  LookAndFeel::NotifyChangedAllWindows(aKind);
}

nsresult nsBaseWidget::NotifyIME(const IMENotification& aIMENotification) {
  if (mIMEHasQuit) {
    return NS_OK;
  }
  switch (aIMENotification.mMessage) {
    case REQUEST_TO_COMMIT_COMPOSITION:
    case REQUEST_TO_CANCEL_COMPOSITION:
--> --------------------

--> maximum size reached

--> --------------------

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