SSL nsWindow.cpp Interaktion und
PortierbarkeitC

/* -*- Mode: c++; c-basic-offset: 2; tab-width: 4; indent-tabs-mode: nil; -*-
* vim: set sw=2 ts=4 expandtab:
* 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 <algorithm>
#include <atomic>
#include <android/log.h>
#include <android/native_window.h>
#include <android/native_window_jni.h>
#include <math.h>
#include <queue>
#include <type_traits>
#include <unistd.h>

#include "AndroidBridge.h"
#include "AndroidBridgeUtilities.h"
#include "AndroidCompositorWidget.h"
#include "AndroidContentController.h"
#include "AndroidDragEvent.h"
#include "AndroidUiThread.h"
#include "AndroidView.h"
#include "AndroidWidgetUtils.h"
#include "gfxContext.h"
#include "GeckoEditableSupport.h"
#include "GeckoViewOutputStream.h"
#include "GeckoViewSupport.h"
#include "GLContext.h"
#include "GLContextProvider.h"
#include "JavaBuiltins.h"
#include "JavaExceptions.h"
#include "KeyEvent.h"
#include "MotionEvent.h"
#include "ScopedGLHelpers.h"
#include "ScreenHelperAndroid.h"
#include "TouchResampler.h"
#include "WidgetUtils.h"
#include "WindowRenderer.h"

#include "mozilla/EventForwards.h"
#include "nsAppShell.h"
#include "nsContentUtils.h"
#include "nsFocusManager.h"
#include "nsGkAtoms.h"
#include "nsGfxCIID.h"
#include "nsIDocShellTreeOwner.h"
#include "nsLayoutUtils.h"
#include "nsNetUtil.h"
#include "nsPrintfCString.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
#include "nsUserIdleService.h"
#include "nsViewManager.h"
#include "nsWidgetsCID.h"
#include "nsWindow.h"

#include "nsIWidgetListener.h"
#include "nsIWindowWatcher.h"
#include "nsIAppWindow.h"
#include "nsIPrintSettings.h"
#include "nsIPrintSettingsService.h"

#include "mozilla/Logging.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_android.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/WeakPtr.h"
#include "mozilla/WheelHandlingHelper.h"  // for WheelDeltaAdjustmentStrategy
#include "mozilla/a11y/SessionAccessibility.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/BrowserHost.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/gfx/Swizzle.h"
#include "mozilla/gfx/Types.h"
#include "mozilla/ipc/Shmem.h"
#include "mozilla/java/EventDispatcherWrappers.h"
#include "mozilla/java/GeckoAppShellWrappers.h"
#include "mozilla/java/GeckoEditableChildWrappers.h"
#include "mozilla/java/GeckoResultWrappers.h"
#include "mozilla/java/GeckoSessionNatives.h"
#include "mozilla/java/GeckoSystemStateListenerWrappers.h"
#include "mozilla/java/PanZoomControllerNatives.h"
#include "mozilla/java/SessionAccessibilityWrappers.h"
#include "mozilla/java/SurfaceControlManagerWrappers.h"
#include "mozilla/jni/NativesInlines.h"
#include "mozilla/layers/APZEventState.h"
#include "mozilla/layers/APZInputBridge.h"
#include "mozilla/layers/APZThreadUtils.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/CompositorOGL.h"
#include "mozilla/layers/CompositorSession.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/layers/UiCompositorControllerChild.h"
#include "mozilla/layers/IAPZCTreeManager.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/widget/AndroidVsync.h"
#include "mozilla/widget/Screen.h"

#define GVS_LOG(...) MOZ_LOG(sGVSupportLog, LogLevel::Warning, (__VA_ARGS__))

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

using mozilla::dom::ContentChild;
using mozilla::dom::ContentParent;
using mozilla::gfx::DataSourceSurface;
using mozilla::gfx::IntSize;
using mozilla::gfx::Matrix;
using mozilla::gfx::SurfaceFormat;
using mozilla::java::GeckoSession;
using mozilla::java::sdk::IllegalStateException;
using GeckoPrintException = GeckoSession::GeckoPrintException;
static mozilla::LazyLogModule sGVSupportLog("GeckoViewSupport");

// All the toplevel windows that have been created; these are in
// stacking order, so the window at gTopLevelWindows[0] is the topmost
// one.
MOZ_RUNINIT static nsTArray<nsWindow*> gTopLevelWindows;

static bool sFailedToCreateGLContext = false;

// Multitouch swipe thresholds in inches
static const double SWIPE_MAX_PINCH_DELTA_INCHES = 0.4;
static const double SWIPE_MIN_DISTANCE_INCHES = 0.6;

static const double kTouchResampleVsyncAdjustMs = 5.0;

static const int32_t INPUT_RESULT_UNHANDLED =
    java::PanZoomController::INPUT_RESULT_UNHANDLED;
static const int32_t INPUT_RESULT_HANDLED =
    java::PanZoomController::INPUT_RESULT_HANDLED;
static const int32_t INPUT_RESULT_HANDLED_CONTENT =
    java::PanZoomController::INPUT_RESULT_HANDLED_CONTENT;
static const int32_t INPUT_RESULT_IGNORED =
    java::PanZoomController::INPUT_RESULT_IGNORED;

static const nsCString::size_type MAX_TOPLEVEL_DATA_URI_LEN = 2 * 1024 * 1024;

// Unique ID given to each widget, to identify it for the
// CompositorSurfaceManager.
static std::atomic<int32_t> sWidgetId{0};

namespace {
template <class Instance, class Impl>
std::enable_if_t<jni::detail::NativePtrPicker<Impl>::value ==
                     jni::detail::NativePtrType::REFPTR,
                 void>
CallAttachNative(Instance aInstance, Impl* aImpl) {
  Impl::AttachNative(aInstance, RefPtr<Impl>(aImpl).get());
}

template <class Instance, class Impl>
std::enable_if_t<jni::detail::NativePtrPicker<Impl>::value ==
                     jni::detail::NativePtrType::OWNING,
                 void>
CallAttachNative(Instance aInstance, Impl* aImpl) {
  Impl::AttachNative(aInstance, UniquePtr<Impl>(aImpl));
}

template <class Lambda>
bool DispatchToUiThread(const char* aName, Lambda&& aLambda) {
  if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
    uiThread->Dispatch(NS_NewRunnableFunction(aName, std::move(aLambda)));
    return true;
  }
  return false;
}
}  // namespace

namespace mozilla {
namespace widget {

// For double click detection
static int64_t sLastMouseDownTime = 0;
static int32_t sLastMouseButtons = 0;
static int32_t sLastClickCount = 0;
static float sLastMouseDownX = 0;
static float sLastMouseDownY = 0;

using WindowPtr = jni::NativeWeakPtr<GeckoViewSupport>;

/**
* PanZoomController handles its native calls on the UI thread, so make
* it separate from GeckoViewSupport.
*/
class NPZCSupport final
    : public java::PanZoomController::NativeProvider::Natives<NPZCSupport> {
  WindowPtr mWindow;
  java::PanZoomController::NativeProvider::WeakRef mNPZC;

  // Stores the returnResult of each pending motion event between
  // HandleMotionEvent and FinishHandlingMotionEvent.
  std::queue<std::pair<uint64_t, java::GeckoResult::GlobalRef>>
      mPendingMotionEventReturnResults;

  RefPtr<AndroidVsync> mAndroidVsync;
  TouchResampler mTouchResampler;
  int mPreviousButtons = 0;
  bool mListeningToVsync = false;

  // Only true if mAndroidVsync is non-null and the resampling pref is set.
  bool mTouchResamplingEnabled = false;

  template <typename Lambda>
  class InputEvent final : public nsAppShell::Event {
    java::PanZoomController::NativeProvider::GlobalRef mNPZC;
    Lambda mLambda;

   public:
    InputEvent(const NPZCSupport* aNPZCSupport, Lambda&& aLambda)
        : mNPZC(aNPZCSupport->mNPZC), mLambda(std::move(aLambda)) {}

    void Run() override {
      MOZ_ASSERT(NS_IsMainThread());

      JNIEnv* const env = jni::GetGeckoThreadEnv();
      const auto npzcSupportWeak = GetNative(
          java::PanZoomController::NativeProvider::LocalRef(env, mNPZC));
      if (!npzcSupportWeak) {
        // We already shut down.
        env->ExceptionClear();
        return;
      }

      auto acc = npzcSupportWeak->Access();
      if (!acc) {
        // We already shut down.
        env->ExceptionClear();
        return;
      }

      auto win = acc->mWindow.Access();
      if (!win) {
        // We already shut down.
        env->ExceptionClear();
        return;
      }

      nsWindow* const window = win->GetNsWindow();
      if (!window) {
        // We already shut down.
        env->ExceptionClear();
        return;
      }

      window->UserActivity();
      return mLambda(window);
    }

    bool IsUIEvent() const override { return true; }
  };

  class MOZ_HEAP_CLASS Observer final : public AndroidVsync::Observer {
   public:
    static Observer* Create(jni::NativeWeakPtr<NPZCSupport>&& aNPZCSupport) {
      return new Observer(std::move(aNPZCSupport));
    }

   private:
    // Private constructor, part of a strategy to make sure
    // we're only able to create these on the heap.
    explicit Observer(jni::NativeWeakPtr<NPZCSupport>&& aNPZCSupport)
        : mNPZCSupport(std::move(aNPZCSupport)) {}

    void OnVsync(const TimeStamp& aTimeStamp) override {
      auto accessor = mNPZCSupport.Access();

      if (!accessor) {
        return;
      }

      accessor->mTouchResampler.NotifyFrame(
          aTimeStamp -
          TimeDuration::FromMilliseconds(kTouchResampleVsyncAdjustMs));
      accessor->ConsumeMotionEventsFromResampler();
    }

    void Dispose() override { delete this; }

    jni::NativeWeakPtr<NPZCSupport> mNPZCSupport;
  };

  Observer* mObserver = nullptr;

  template <typename Lambda>
  void PostInputEvent(Lambda&& aLambda) {
    // Use priority queue for input events.
    nsAppShell::PostEvent(
        MakeUnique<InputEvent<Lambda>>(this, std::move(aLambda)));
  }

public:
  typedef java::PanZoomController::NativeProvider::Natives<NPZCSupport> Base;

  NPZCSupport(WindowPtr aWindow,
              const java::PanZoomController::NativeProvider::LocalRef& aNPZC)
      : mWindow(aWindow), mNPZC(aNPZC) {
#if defined(DEBUG)
    auto win(mWindow.Access());
    MOZ_ASSERT(!!win);
#endif  // defined(DEBUG)

    mAndroidVsync = AndroidVsync::GetInstance();
  }

  ~NPZCSupport() {
    if (mListeningToVsync) {
      MOZ_RELEASE_ASSERT(mAndroidVsync);
      mAndroidVsync->UnregisterObserver(mObserver, AndroidVsync::INPUT);
      mListeningToVsync = false;
    }
  }

  using Base::AttachNative;
  using Base::DisposeNative;

  void OnWeakNonIntrusiveDetach(already_AddRefed<Runnable> aDisposer) {
    RefPtr<Runnable> disposer = aDisposer;
    // There are several considerations when shutting down NPZC. 1) The
    // Gecko thread may destroy NPZC at any time when nsWindow closes. 2)
    // There may be pending events on the Gecko thread when NPZC is
    // destroyed. 3) mWindow may not be available when the pending event
    // runs. 4) The UI thread may destroy NPZC at any time when GeckoView
    // is destroyed. 5) The UI thread may destroy NPZC at the same time as
    // Gecko thread trying to destroy NPZC. 6) There may be pending calls
    // on the UI thread when NPZC is destroyed. 7) mWindow may have been
    // cleared on the Gecko thread when the pending call happens on the UI
    // thread.
    //
    // 1) happens through OnWeakNonIntrusiveDetach, which first notifies the UI
    // thread through Destroy; Destroy then calls DisposeNative, which
    // finally disposes the native instance back on the Gecko thread. Using
    // Destroy to indirectly call DisposeNative here also solves 5), by
    // making everything go through the UI thread, avoiding contention.
    //
    // 2) and 3) are solved by clearing mWindow, which signals to the
    // pending event that we had shut down. In that case the event bails
    // and does not touch mWindow.
    //
    // 4) happens through DisposeNative directly.
    //
    // 6) is solved by keeping a destroyed flag in the Java NPZC instance,
    // and only make a pending call if the destroyed flag is not set.
    //
    // 7) is solved by taking a lock whenever mWindow is modified on the
    // Gecko thread or accessed on the UI thread. That way, we don't
    // release mWindow until the UI thread is done using it, thus avoiding
    // the race condition.

    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
      auto npzc = java::PanZoomController::NativeProvider::GlobalRef(mNPZC);
      if (!npzc) {
        return;
      }

      uiThread->Dispatch(
          NS_NewRunnableFunction("NPZCSupport::OnWeakNonIntrusiveDetach",
                                 [npzc, disposer = std::move(disposer)] {
                                   npzc->SetAttached(false);
                                   disposer->Run();
                                 }));
    }
  }

  const java::PanZoomController::NativeProvider::Ref& GetJavaNPZC() const {
    return mNPZC;
  }

public:
  void SetIsLongpressEnabled(bool aIsLongpressEnabled) {
    RefPtr<IAPZCTreeManager> controller;

    if (auto window = mWindow.Access()) {
      nsWindow* gkWindow = window->GetNsWindow();
      if (gkWindow) {
        controller = gkWindow->mAPZC;
      }
    }

    if (controller) {
      controller->SetLongTapEnabled(aIsLongpressEnabled);
    }
  }

  int32_t HandleScrollEvent(int64_t aTime, int32_t aMetaState, float aX,
                            float aY, float aHScroll, float aVScroll) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    RefPtr<IAPZCTreeManager> controller;

    if (auto window = mWindow.Access()) {
      nsWindow* gkWindow = window->GetNsWindow();
      if (gkWindow) {
        controller = gkWindow->mAPZC;
      }
    }

    if (!controller) {
      return INPUT_RESULT_UNHANDLED;
    }

    ScreenPoint origin = ScreenPoint(aX, aY);

    if (StaticPrefs::ui_scrolling_negate_wheel_scroll()) {
      aHScroll = -aHScroll;
      aVScroll = -aVScroll;
    }

    ScrollWheelInput input(
        nsWindow::GetEventTimeStamp(aTime), nsWindow::GetModifiers(aMetaState),
        ScrollWheelInput::SCROLLMODE_SMOOTH,
        ScrollWheelInput::SCROLLDELTA_PIXEL, origin, aHScroll, aVScroll, false,
        // XXX Do we need to support auto-dir scrolling
        // for Android widgets with a wheel device?
        // Currently, I just leave it unimplemented. If
        // we need to implement it, what's the extra work
        // to do?
        WheelDeltaAdjustmentStrategy::eNone);

    APZEventResult result = controller->InputBridge()->ReceiveInputEvent(input);
    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      return INPUT_RESULT_IGNORED;
    }

    PostInputEvent([input = std::move(input), result](nsWindow* window) {
      WidgetWheelEvent wheelEvent = input.ToWidgetEvent(window);
      window->ProcessUntransformedAPZEvent(&wheelEvent, result);
    });

    switch (result.GetStatus()) {
      case nsEventStatus_eIgnore:
        return INPUT_RESULT_UNHANDLED;
      case nsEventStatus_eConsumeDoDefault:
        return result.GetHandledResult()->IsHandledByRoot()
                   ? INPUT_RESULT_HANDLED
                   : INPUT_RESULT_HANDLED_CONTENT;
      default:
        MOZ_ASSERT_UNREACHABLE("Unexpected nsEventStatus");
        return INPUT_RESULT_UNHANDLED;
    }
  }

private:
  static MouseInput::ButtonType GetButtonType(int button) {
    MouseInput::ButtonType result = MouseInput::NONE;

    switch (button) {
      case java::sdk::MotionEvent::BUTTON_PRIMARY:
        result = MouseInput::PRIMARY_BUTTON;
        break;
      case java::sdk::MotionEvent::BUTTON_SECONDARY:
        result = MouseInput::SECONDARY_BUTTON;
        break;
      case java::sdk::MotionEvent::BUTTON_TERTIARY:
        result = MouseInput::MIDDLE_BUTTON;
        break;
      default:
        break;
    }

    return result;
  }

  static int16_t ConvertButtons(int buttons) {
    int16_t result = 0;

    if (buttons & java::sdk::MotionEvent::BUTTON_PRIMARY) {
      result |= MouseButtonsFlag::ePrimaryFlag;
    }
    if (buttons & java::sdk::MotionEvent::BUTTON_SECONDARY) {
      result |= MouseButtonsFlag::eSecondaryFlag;
    }
    if (buttons & java::sdk::MotionEvent::BUTTON_TERTIARY) {
      result |= MouseButtonsFlag::eMiddleFlag;
    }
    if (buttons & java::sdk::MotionEvent::BUTTON_BACK) {
      result |= MouseButtonsFlag::e4thFlag;
    }
    if (buttons & java::sdk::MotionEvent::BUTTON_FORWARD) {
      result |= MouseButtonsFlag::e5thFlag;
    }

    return result;
  }

  static int32_t ConvertAPZHandledPlace(APZHandledPlace aHandledPlace) {
    switch (aHandledPlace) {
      case APZHandledPlace::Unhandled:
        return INPUT_RESULT_UNHANDLED;
      case APZHandledPlace::HandledByRoot:
        return INPUT_RESULT_HANDLED;
      case APZHandledPlace::HandledByContent:
        return INPUT_RESULT_HANDLED_CONTENT;
      case APZHandledPlace::Invalid:
        MOZ_ASSERT_UNREACHABLE("The handled result should NOT be Invalid");
        return INPUT_RESULT_UNHANDLED;
    }
    MOZ_ASSERT_UNREACHABLE("Unknown handled result");
    return INPUT_RESULT_UNHANDLED;
  }

  static int32_t ConvertSideBits(SideBits aSideBits) {
    int32_t ret = java::PanZoomController::SCROLLABLE_FLAG_NONE;
    if (aSideBits & SideBits::eTop) {
      ret |= java::PanZoomController::SCROLLABLE_FLAG_TOP;
    }
    if (aSideBits & SideBits::eRight) {
      ret |= java::PanZoomController::SCROLLABLE_FLAG_RIGHT;
    }
    if (aSideBits & SideBits::eBottom) {
      ret |= java::PanZoomController::SCROLLABLE_FLAG_BOTTOM;
    }
    if (aSideBits & SideBits::eLeft) {
      ret |= java::PanZoomController::SCROLLABLE_FLAG_LEFT;
    }
    return ret;
  }

  static int32_t ConvertScrollDirections(
      layers::ScrollDirections aScrollDirections) {
    int32_t ret = java::PanZoomController::OVERSCROLL_FLAG_NONE;
    if (aScrollDirections.contains(layers::HorizontalScrollDirection)) {
      ret |= java::PanZoomController::OVERSCROLL_FLAG_HORIZONTAL;
    }
    if (aScrollDirections.contains(layers::VerticalScrollDirection)) {
      ret |= java::PanZoomController::OVERSCROLL_FLAG_VERTICAL;
    }
    return ret;
  }

  static java::PanZoomController::InputResultDetail::LocalRef
  ConvertAPZHandledResult(const APZHandledResult& aHandledResult) {
    return java::PanZoomController::InputResultDetail::New(
        ConvertAPZHandledPlace(aHandledResult.mPlace),
        ConvertSideBits(aHandledResult.mScrollableDirections),
        ConvertScrollDirections(aHandledResult.mOverscrollDirections));
  }

  static bool IsIntoDoubleClickThreshold(float aX, float aY) {
    int32_t deltaX = abs((int32_t)floorf(sLastMouseDownX - aX));
    int32_t deltaY = abs((int32_t)floorf(sLastMouseDownY - aY));
    int32_t threshold = StaticPrefs::widget_double_click_threshold();

    return (deltaX * deltaX + deltaY * deltaY < threshold * threshold);
  }

  static bool IsDoubleClick(int64_t aTime, float aX, float aY, int buttons) {
    if (sLastMouseButtons != buttons) {
      return false;
    }

    int64_t deltaTime = aTime - sLastMouseDownTime;
    if (deltaTime < (int64_t)StaticPrefs::widget_double_click_min() ||
        deltaTime > (int64_t)StaticPrefs::widget_double_click_timeout()) {
      return false;
    }

    return IsIntoDoubleClickThreshold(aX, aY);
  }

public:
  int32_t HandleMouseEvent(int32_t aAction, int64_t aTime, int32_t aMetaState,
                           float aX, float aY, int buttons) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    RefPtr<IAPZCTreeManager> controller;

    if (auto window = mWindow.Access()) {
      nsWindow* gkWindow = window->GetNsWindow();
      if (gkWindow) {
        controller = gkWindow->mAPZC;
      }
    }

    if (!controller) {
      return INPUT_RESULT_UNHANDLED;
    }

    MouseInput::MouseType mouseType = MouseInput::MOUSE_NONE;
    MouseInput::ButtonType buttonType = MouseInput::NONE;
    switch (aAction) {
      case java::sdk::MotionEvent::ACTION_DOWN:
        mouseType = MouseInput::MOUSE_DOWN;
        buttonType = GetButtonType(buttons ^ mPreviousButtons);
        mPreviousButtons = buttons;

        if (IsDoubleClick(aTime, aX, aY, buttons)) {
          sLastClickCount++;
        } else {
          sLastClickCount = 1;
        }
        sLastMouseDownTime = aTime;
        sLastMouseDownX = aX;
        sLastMouseDownY = aY;
        sLastMouseButtons = buttons;
        break;
      case java::sdk::MotionEvent::ACTION_UP:
        mouseType = MouseInput::MOUSE_UP;
        buttonType = GetButtonType(buttons ^ mPreviousButtons);
        mPreviousButtons = buttons;
        break;
      case java::sdk::MotionEvent::ACTION_MOVE:
        mouseType = MouseInput::MOUSE_MOVE;

        if (!IsIntoDoubleClickThreshold(aX, aY)) {
          sLastClickCount = 0;
        }
        break;
      case java::sdk::MotionEvent::ACTION_HOVER_MOVE:
        mouseType = MouseInput::MOUSE_MOVE;
        break;
      case java::sdk::MotionEvent::ACTION_HOVER_ENTER:
        mouseType = MouseInput::MOUSE_WIDGET_ENTER;
        break;
      case java::sdk::MotionEvent::ACTION_HOVER_EXIT:
        mouseType = MouseInput::MOUSE_WIDGET_EXIT;
        break;
      default:
        break;
    }

    if (mouseType == MouseInput::MOUSE_NONE) {
      return INPUT_RESULT_UNHANDLED;
    }

    ScreenPoint origin = ScreenPoint(aX, aY);

    MouseInput input(
        mouseType, buttonType, MouseEvent_Binding::MOZ_SOURCE_MOUSE,
        ConvertButtons(buttons), origin, nsWindow::GetEventTimeStamp(aTime),
        nsWindow::GetModifiers(aMetaState));

    APZEventResult result = controller->InputBridge()->ReceiveInputEvent(input);
    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      return INPUT_RESULT_IGNORED;
    }

    PostInputEvent([input = std::move(input), result,
                    clickCount = sLastClickCount](nsWindow* window) {
      WidgetMouseEvent mouseEvent =
          input.ToWidgetEvent<WidgetMouseEvent>(window);
      mouseEvent.mClickCount = clickCount;
      window->ProcessUntransformedAPZEvent(&mouseEvent, result);
      if (MouseInput::SECONDARY_BUTTON == input.mButtonType) {
        if ((StaticPrefs::ui_context_menus_after_mouseup() &&
             MouseInput::MOUSE_UP == input.mType) ||
            (!StaticPrefs::ui_context_menus_after_mouseup() &&
             MouseInput::MOUSE_DOWN == input.mType)) {
          MouseInput contextMenu = input;

          // Actually we don't dispatch context menu event to APZ since we don't
          // handle it on APZ yet. If handling it, we need to consider how to
          // dispatch it on APZ thread. It may cause a race condition.
          contextMenu.mType = MouseInput::MOUSE_CONTEXTMENU;

          if (contextMenu.IsPointerEventType()) {
            WidgetPointerEvent contextMenuEvent =
                contextMenu.ToWidgetEvent<WidgetPointerEvent>(window);
            window->ProcessUntransformedAPZEvent(&contextMenuEvent, result);
          } else {
            WidgetMouseEvent contextMenuEvent =
                contextMenu.ToWidgetEvent<WidgetMouseEvent>(window);
            window->ProcessUntransformedAPZEvent(&contextMenuEvent, result);
          }
        }
      }
    });

    switch (result.GetStatus()) {
      case nsEventStatus_eIgnore:
        return INPUT_RESULT_UNHANDLED;
      case nsEventStatus_eConsumeDoDefault:
        return result.GetHandledResult()->IsHandledByRoot()
                   ? INPUT_RESULT_HANDLED
                   : INPUT_RESULT_HANDLED_CONTENT;
      default:
        MOZ_ASSERT_UNREACHABLE("Unexpected nsEventStatus");
        return INPUT_RESULT_UNHANDLED;
    }
  }

  // Convert MotionEvent touch radius and orientation into the format required
  // by w3c touchevents.
  // toolMajor and toolMinor span a rectangle that's oriented as per
  // aOrientation, centered around the touch point.
  static std::pair<float, ScreenSize> ConvertOrientationAndRadius(
      float aOrientation, float aToolMajor, float aToolMinor) {
    float angle = aOrientation * 180.0f / M_PI;
    // w3c touchevents spec does not allow orientations == 90
    // this shifts it to -90, which will be shifted to zero below
    if (angle >= 90.0) {
      angle -= 180.0f;
    }

    // w3c touchevent radii are given with an orientation between 0 and
    // 90. The radii are found by removing the orientation and
    // measuring the x and y radii of the resulting ellipse. For
    // Android orientations >= 0 and < 90, use the y radius as the
    // major radius, and x as the minor radius. However, for an
    // orientation < 0, we have to shift the orientation by adding 90,
    // and reverse which radius is major and minor.
    ScreenSize radius;
    if (angle < 0.0f) {
      angle += 90.0f;
      radius =
          ScreenSize(int32_t(aToolMajor / 2.0f), int32_t(aToolMinor / 2.0f));
    } else {
      radius =
          ScreenSize(int32_t(aToolMinor / 2.0f), int32_t(aToolMajor / 2.0f));
    }

    return std::make_pair(angle, radius);
  }

  void HandleMotionEvent(
      const java::PanZoomController::NativeProvider::LocalRef& aInstance,
      jni::Object::Param aEventData, float aScreenX, float aScreenY,
      jni::Object::Param aResult) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    auto returnResult = java::GeckoResult::Ref::From(aResult);
    auto eventData =
        java::PanZoomController::MotionEventData::Ref::From(aEventData);
    nsTArray<int32_t> pointerId(eventData->PointerId()->GetElements());
    size_t pointerCount = pointerId.Length();
    MultiTouchInput::MultiTouchType type;
    size_t startIndex = 0;
    size_t endIndex = pointerCount;

    switch (eventData->Action()) {
      case java::sdk::MotionEvent::ACTION_DOWN:
      case java::sdk::MotionEvent::ACTION_POINTER_DOWN:
        type = MultiTouchInput::MULTITOUCH_START;
        break;
      case java::sdk::MotionEvent::ACTION_MOVE:
        type = MultiTouchInput::MULTITOUCH_MOVE;
        break;
      case java::sdk::MotionEvent::ACTION_UP:
      case java::sdk::MotionEvent::ACTION_POINTER_UP:
        // for pointer-up events we only want the data from
        // the one pointer that went up
        type = MultiTouchInput::MULTITOUCH_END;
        startIndex = eventData->ActionIndex();
        endIndex = startIndex + 1;
        break;
      case java::sdk::MotionEvent::ACTION_OUTSIDE:
      case java::sdk::MotionEvent::ACTION_CANCEL:
        type = MultiTouchInput::MULTITOUCH_CANCEL;
        break;
      default:
        if (returnResult) {
          returnResult->Complete(
              java::sdk::Integer::ValueOf(INPUT_RESULT_UNHANDLED));
        }
        return;
    }

    MultiTouchInput input(type, eventData->Time(),
                          nsWindow::GetEventTimeStamp(eventData->Time()), 0);
    input.modifiers = nsWindow::GetModifiers(eventData->MetaState());
    input.mTouches.SetCapacity(endIndex - startIndex);
    input.mScreenOffset =
        ExternalIntPoint(int32_t(floorf(aScreenX)), int32_t(floorf(aScreenY)));

    size_t historySize = eventData->HistorySize();
    nsTArray<int64_t> historicalTime(
        eventData->HistoricalTime()->GetElements());
    MOZ_RELEASE_ASSERT(historicalTime.Length() == historySize);

    // Each of these is |historySize| sets of |pointerCount| values.
    size_t historicalDataCount = historySize * pointerCount;
    nsTArray<float> historicalX(eventData->HistoricalX()->GetElements());
    nsTArray<float> historicalY(eventData->HistoricalY()->GetElements());
    nsTArray<float> historicalOrientation(
        eventData->HistoricalOrientation()->GetElements());
    nsTArray<float> historicalPressure(
        eventData->HistoricalPressure()->GetElements());
    nsTArray<float> historicalToolMajor(
        eventData->HistoricalToolMajor()->GetElements());
    nsTArray<float> historicalToolMinor(
        eventData->HistoricalToolMinor()->GetElements());

    MOZ_RELEASE_ASSERT(historicalX.Length() == historicalDataCount);
    MOZ_RELEASE_ASSERT(historicalY.Length() == historicalDataCount);
    MOZ_RELEASE_ASSERT(historicalOrientation.Length() == historicalDataCount);
    MOZ_RELEASE_ASSERT(historicalPressure.Length() == historicalDataCount);
    MOZ_RELEASE_ASSERT(historicalToolMajor.Length() == historicalDataCount);
    MOZ_RELEASE_ASSERT(historicalToolMinor.Length() == historicalDataCount);

    // Each of these is |pointerCount| values.
    nsTArray<float> x(eventData->X()->GetElements());
    nsTArray<float> y(eventData->Y()->GetElements());
    nsTArray<float> orientation(eventData->Orientation()->GetElements());
    nsTArray<float> pressure(eventData->Pressure()->GetElements());
    nsTArray<float> toolMajor(eventData->ToolMajor()->GetElements());
    nsTArray<float> toolMinor(eventData->ToolMinor()->GetElements());

    MOZ_ASSERT(x.Length() == pointerCount);
    MOZ_ASSERT(y.Length() == pointerCount);
    MOZ_ASSERT(orientation.Length() == pointerCount);
    MOZ_ASSERT(pressure.Length() == pointerCount);
    MOZ_ASSERT(toolMajor.Length() == pointerCount);
    MOZ_ASSERT(toolMinor.Length() == pointerCount);

    for (size_t i = startIndex; i < endIndex; i++) {
      auto [orien, radius] = ConvertOrientationAndRadius(
          orientation[i], toolMajor[i], toolMinor[i]);

      ScreenIntPoint point(int32_t(floorf(x[i])), int32_t(floorf(y[i])));
      SingleTouchData singleTouchData(pointerId[i], point, radius, orien,
                                      pressure[i]);

      for (size_t historyIndex = 0; historyIndex < historySize;
           historyIndex++) {
        size_t historicalI = historyIndex * pointerCount + i;
        auto [historicalAngle, historicalRadius] = ConvertOrientationAndRadius(
            historicalOrientation[historicalI],
            historicalToolMajor[historicalI], historicalToolMinor[historicalI]);
        ScreenIntPoint historicalPoint(
            int32_t(floorf(historicalX[historicalI])),
            int32_t(floorf(historicalY[historicalI])));
        singleTouchData.mHistoricalData.AppendElement(
            SingleTouchData::HistoricalTouchData{
                nsWindow::GetEventTimeStamp(historicalTime[historyIndex]),
                historicalPoint,
                {},  // mLocalScreenPoint will be computed later by APZ
                historicalRadius,
                historicalAngle,
                historicalPressure[historicalI]});
      }

      input.mTouches.AppendElement(singleTouchData);
    }

    if (mAndroidVsync &&
        eventData->Action() == java::sdk::MotionEvent::ACTION_DOWN) {
      // Query pref value at the beginning of a touch gesture so that we don't
      // leave events stuck in the resampler after a pref flip.
      mTouchResamplingEnabled = StaticPrefs::android_touch_resampling_enabled();
    }

    if (!mTouchResamplingEnabled) {
      FinishHandlingMotionEvent(std::move(input),
                                java::GeckoResult::LocalRef(returnResult));
      return;
    }

    uint64_t eventId = mTouchResampler.ProcessEvent(std::move(input));
    mPendingMotionEventReturnResults.push(
        {eventId, java::GeckoResult::GlobalRef(returnResult)});

    RegisterOrUnregisterForVsync(mTouchResampler.InTouchingState());
    ConsumeMotionEventsFromResampler();
  }

  void RegisterOrUnregisterForVsync(bool aNeedVsync) {
    MOZ_RELEASE_ASSERT(mAndroidVsync);
    if (aNeedVsync && !mListeningToVsync) {
      MOZ_ASSERT(!mObserver);
      auto win = mWindow.Access();
      if (!win) {
        return;
      }
      RefPtr<nsWindow> gkWindow = win->GetNsWindow();
      if (!gkWindow) {
        return;
      }
      MutexAutoLock lock(gkWindow->GetDestroyMutex());
      if (gkWindow->Destroyed()) {
        return;
      }
      jni::NativeWeakPtr<NPZCSupport> weakPtrToThis =
          gkWindow->GetNPZCSupportWeakPtr();
      mObserver = Observer::Create(std::move(weakPtrToThis));
      mAndroidVsync->RegisterObserver(mObserver, AndroidVsync::INPUT);
    } else if (!aNeedVsync && mListeningToVsync) {
      mAndroidVsync->UnregisterObserver(mObserver, AndroidVsync::INPUT);
      mObserver = nullptr;
    }
    mListeningToVsync = aNeedVsync;
  }

  void HandleDragEvent(int32_t aAction, int64_t aTime, float aX, float aY,
                       jni::Object::Param aDropData) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    RefPtr<IAPZCTreeManager> controller;
    if (auto window = mWindow.Access()) {
      if (nsWindow* gkWindow = window->GetNsWindow()) {
        controller = gkWindow->mAPZC;
      }
    }

    if (!controller) {
      return;
    }

    MouseInput::MouseType mouseType = MouseInput::MouseType::MOUSE_NONE;
    switch (aAction) {
      case java::sdk::DragEvent::ACTION_DRAG_STARTED:
        mouseType = MouseInput::MouseType::MOUSE_DRAG_START;
        break;
      case java::sdk::DragEvent::ACTION_DRAG_ENDED:
        mouseType = MouseInput::MouseType::MOUSE_DRAG_END;
        break;
      case java::sdk::DragEvent::ACTION_DRAG_ENTERED:
        mouseType = MouseInput::MouseType::MOUSE_DRAG_ENTER;
        break;
      case java::sdk::DragEvent::ACTION_DRAG_LOCATION:
        mouseType = MouseInput::MouseType::MOUSE_DRAG_OVER;
        break;
      case java::sdk::DragEvent::ACTION_DRAG_EXITED:
        mouseType = MouseInput::MouseType::MOUSE_DRAG_EXIT;
        break;
      case java::sdk::DragEvent::ACTION_DROP:
        mouseType = MouseInput::MouseType::MOUSE_DROP;
        break;
      default:
        break;
    }
    ScreenPoint origin = ScreenPoint(aX, aY);
    MouseInput input(
        mouseType, MouseInput::NONE, MouseEvent_Binding::MOZ_SOURCE_MOUSE, 0,
        origin, nsWindow::GetEventTimeStamp(aTime), nsWindow::GetModifiers(0));

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

    PostInputEvent(
        [input = std::move(input), result, aAction, aX, aY,
         dropData = jni::Object::GlobalRef(aDropData)](nsWindow* window) {
          window->OnDragEvent(aAction, aX, aY, dropData, result, input);
        });
  }

  void ConsumeMotionEventsFromResampler() {
    auto outgoing = mTouchResampler.ConsumeOutgoingEvents();
    while (!outgoing.empty()) {
      auto outgoingEvent = std::move(outgoing.front());
      outgoing.pop();
      java::GeckoResult::GlobalRef returnResult;
      if (outgoingEvent.mEventId) {
        // Look up the GeckoResult for this event.
        // The outgoing events from the resampler are in the same order as the
        // original events, and no event IDs are skipped.
        MOZ_RELEASE_ASSERT(!mPendingMotionEventReturnResults.empty());
        auto pair = mPendingMotionEventReturnResults.front();
        mPendingMotionEventReturnResults.pop();
        MOZ_RELEASE_ASSERT(pair.first == *outgoingEvent.mEventId);
        returnResult = pair.second;
      }
      FinishHandlingMotionEvent(std::move(outgoingEvent.mEvent),
                                java::GeckoResult::LocalRef(returnResult));
    }
  }

  void FinishHandlingMotionEvent(MultiTouchInput&& aInput,
                                 java::GeckoResult::LocalRef&& aReturnResult) {
    RefPtr<IAPZCTreeManager> controller;

    if (auto window = mWindow.Access()) {
      nsWindow* gkWindow = window->GetNsWindow();
      if (gkWindow) {
        controller = gkWindow->mAPZC;
      }
    }

    if (!controller) {
      if (aReturnResult) {
        aReturnResult->Complete(java::PanZoomController::InputResultDetail::New(
            INPUT_RESULT_UNHANDLED,
            java::PanZoomController::SCROLLABLE_FLAG_NONE,
            java::PanZoomController::OVERSCROLL_FLAG_NONE));
      }
      return;
    }

    APZInputBridge::InputBlockCallback callback;
    if (aReturnResult) {
      callback = [aReturnResult = java::GeckoResult::GlobalRef(aReturnResult)](
                     uint64_t aInputBlockId,
                     const APZHandledResult& aHandledResult) {
        aReturnResult->Complete(ConvertAPZHandledResult(aHandledResult));
      };
    }
    APZEventResult result = controller->InputBridge()->ReceiveInputEvent(
        aInput, std::move(callback));

    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
      if (aReturnResult) {
        if (result.GetHandledResult() != Nothing()) {
          aReturnResult->Complete(
              ConvertAPZHandledResult(result.GetHandledResult().value()));
        } else {
          MOZ_ASSERT_UNREACHABLE(
              "nsEventStatus_eConsumeNoDefault should involve a valid "
              "APZHandledResult");
          aReturnResult->Complete(
              java::PanZoomController::InputResultDetail::New(
                  INPUT_RESULT_IGNORED,
                  java::PanZoomController::SCROLLABLE_FLAG_NONE,
                  java::PanZoomController::OVERSCROLL_FLAG_NONE));
        }
      }
      return;
    }

    // Dispatch APZ input event on Gecko thread.
    PostInputEvent([input = std::move(aInput), result](nsWindow* window) {
      WidgetTouchEvent touchEvent = input.ToWidgetEvent(window);
      window->ProcessUntransformedAPZEvent(&touchEvent, result);
      window->DispatchHitTest(touchEvent);
    });

    if (aReturnResult && result.GetHandledResult() != Nothing()) {
      MOZ_ASSERT(result.GetStatus() == nsEventStatus_eConsumeDoDefault ||
                 result.GetStatus() == nsEventStatus_eIgnore);
      aReturnResult->Complete(
          ConvertAPZHandledResult(result.GetHandledResult().value()));
    }
  }
};

NS_IMPL_ISUPPORTS(AndroidView, nsIGeckoViewEventDispatcher, nsIGeckoViewView)

nsresult AndroidView::GetInitData(JSContext* aCx,
                                  JS::MutableHandle<JS::Value> aOut) {
  if (!mInitData) {
    aOut.setNull();
    return NS_OK;
  }

  return widget::EventDispatcher::UnboxBundle(aCx, mInitData, aOut);
}

/**
* Compositor has some unique requirements for its native calls, so make it
* separate from GeckoViewSupport.
*/
class LayerViewSupport final
    : public GeckoSession::Compositor::Natives<LayerViewSupport> {
  WindowPtr mWindow;
  GeckoSession::Compositor::WeakRef mCompositor;
  Atomic<bool, ReleaseAcquire> mCompositorPaused;
  java::sdk::Surface::GlobalRef mSurface;
  java::sdk::SurfaceControl::GlobalRef mSurfaceControl;
  int32_t mX;
  int32_t mY;
  int32_t mWidth;
  int32_t mHeight;
  // Used to communicate with the gecko compositor from the UI thread.
  // Set in NotifyCompositorCreated and cleared in
  // NotifyCompositorSessionLost.
  RefPtr<UiCompositorControllerChild> mUiCompositorControllerChild;
  // Whether we have requested a new Surface from the GeckoSession.
  bool mRequestedNewSurface = false;

  Maybe<uint32_t> mDefaultClearColor;

  struct CaptureRequest {
    explicit CaptureRequest() : mResult(nullptr) {}
    explicit CaptureRequest(java::GeckoResult::GlobalRef aResult,
                            java::sdk::Bitmap::GlobalRef aBitmap,
                            const ScreenRect& aSource,
                            const IntSize& aOutputSize)
        : mResult(aResult),
          mBitmap(aBitmap),
          mSource(aSource),
          mOutputSize(aOutputSize) {}

    // where to send the pixels
    java::GeckoResult::GlobalRef mResult;

    // where to store the pixels
    java::sdk::Bitmap::GlobalRef mBitmap;

    ScreenRect mSource;

    IntSize mOutputSize;
  };
  std::queue<CaptureRequest> mCapturePixelsResults;

  // In order to use Event::HasSameTypeAs in PostTo(), we cannot make
  // LayerViewEvent a template because each template instantiation is
  // a different type. So implement LayerViewEvent as a ProxyEvent.
  class LayerViewEvent final : public nsAppShell::ProxyEvent {
    using Event = nsAppShell::Event;

   public:
    static UniquePtr<Event> MakeEvent(UniquePtr<Event>&& event) {
      return MakeUnique<LayerViewEvent>(std::move(event));
    }

    explicit LayerViewEvent(UniquePtr<Event>&& event)
        : nsAppShell::ProxyEvent(std::move(event)) {}

    void PostTo(LinkedList<Event>& queue) override {
      // Give priority to compositor events, but keep in order with
      // existing compositor events.
      nsAppShell::Event* event = queue.getFirst();
      while (event && event->HasSameTypeAs(this)) {
        event = event->getNext();
      }
      if (event) {
        event->setPrevious(this);
      } else {
        queue.insertBack(this);
      }
    }
  };

public:
  typedef GeckoSession::Compositor::Natives<LayerViewSupport> Base;

  LayerViewSupport(WindowPtr aWindow,
                   const GeckoSession::Compositor::LocalRef& aInstance)
      : mWindow(aWindow), mCompositor(aInstance), mCompositorPaused(true) {
#if defined(DEBUG)
    auto win(mWindow.Access());
    MOZ_ASSERT(!!win);
#endif  // defined(DEBUG)
  }

  ~LayerViewSupport() {}

  using Base::AttachNative;
  using Base::DisposeNative;

  void OnWeakNonIntrusiveDetach(already_AddRefed<Runnable> aDisposer) {
    RefPtr<Runnable> disposer = aDisposer;
    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
      GeckoSession::Compositor::GlobalRef compositor(mCompositor);
      if (!compositor) {
        return;
      }

      uiThread->Dispatch(NS_NewRunnableFunction(
          "LayerViewSupport::OnWeakNonIntrusiveDetach",
          [compositor, disposer = std::move(disposer),
           results = &mCapturePixelsResults, window = mWindow]() mutable {
            if (auto accWindow = window.Access()) {
              while (!results->empty()) {
                auto aResult =
                    java::GeckoResult::LocalRef(results->front().mResult);
                if (aResult) {
                  aResult->CompleteExceptionally(
                      java::sdk::IllegalStateException::New(
                          "The compositor has detached from the session")
                          .Cast<jni::Throwable>());
                }
                results->pop();
              }
            }

            compositor->OnCompositorDetached();
            disposer->Run();
          }));
    }
  }

  const GeckoSession::Compositor::Ref& GetJavaCompositor() const {
    return mCompositor;
  }

  bool CompositorPaused() const { return mCompositorPaused; }

  /// Called from the main thread whenever the compositor has been
  /// (re)initialized.
  void NotifyCompositorCreated(
      RefPtr<UiCompositorControllerChild> aUiCompositorControllerChild) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
    mUiCompositorControllerChild = aUiCompositorControllerChild;

    if (mDefaultClearColor) {
      mUiCompositorControllerChild->SetDefaultClearColor(*mDefaultClearColor);
    }

    if (!mCompositorPaused) {
      // If we are using SurfaceControl but mSurface is null, that means the
      // previous surface was destroyed along with the the previous
      // compositor, and we need to create a new one.
      if (mSurfaceControl && !mSurface) {
        mSurface = java::SurfaceControlManager::GetInstance()->GetChildSurface(
            mSurfaceControl, mWidth, mHeight);
      }

      if (auto window{mWindow.Access()}) {
        nsWindow* gkWindow = window->GetNsWindow();
        if (gkWindow) {
          mUiCompositorControllerChild->OnCompositorSurfaceChanged(
              gkWindow->mWidgetId, mSurface);
        }
      }

      bool resumed = mUiCompositorControllerChild->ResumeAndResize(
          mX, mY, mWidth, mHeight);
      if (!resumed) {
        gfxCriticalNote
            << "Failed to resume compositor from NotifyCompositorCreated";
        RequestNewSurface();
      }
    }
  }

  /// Called from the main thread whenever the compositor has been destroyed.
  void NotifyCompositorSessionLost() {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
    mUiCompositorControllerChild = nullptr;

    if (mSurfaceControl) {
      // If we are using SurfaceControl then we must set the Surface to null
      // here to ensure we create a new one when the new compositor is
      // created.
      mSurface = nullptr;
    }

    if (auto window = mWindow.Access()) {
      while (!mCapturePixelsResults.empty()) {
        auto result =
            java::GeckoResult::LocalRef(mCapturePixelsResults.front().mResult);
        if (result) {
          result->CompleteExceptionally(
              java::sdk::IllegalStateException::New(
                  "Compositor session lost during screen pixels request")
                  .Cast<jni::Throwable>());
        }
        mCapturePixelsResults.pop();
      }
    }
  }

  java::sdk::Surface::Param GetSurface() { return mSurface; }

private:
  already_AddRefed<DataSourceSurface> FlipScreenPixels(
      Shmem& aMem, const ScreenIntSize& aInSize, const ScreenRect& aInRegion,
      const IntSize& aOutSize) {
    RefPtr<gfx::DataSourceSurface> image =
        gfx::Factory::CreateWrappingDataSourceSurface(
            aMem.get<uint8_t>(),
            StrideForFormatAndWidth(SurfaceFormat::B8G8R8A8, aInSize.width),
            IntSize(aInSize.width, aInSize.height), SurfaceFormat::B8G8R8A8);
    RefPtr<gfx::DrawTarget> drawTarget =
        gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
            aOutSize, SurfaceFormat::B8G8R8A8);
    if (!drawTarget) {
      return nullptr;
    }

    drawTarget->SetTransform(Matrix::Scaling(1.0, -1.0) *
                             Matrix::Translation(0, aOutSize.height));

    gfx::Rect srcRect(aInRegion.x,
                      (aInSize.height - aInRegion.height) - aInRegion.y,
                      aInRegion.width, aInRegion.height);
    gfx::Rect destRect(0, 0, aOutSize.width, aOutSize.height);
    drawTarget->DrawSurface(image, destRect, srcRect);

    RefPtr<gfx::SourceSurface> snapshot = drawTarget->Snapshot();
    RefPtr<gfx::DataSourceSurface> data = snapshot->GetDataSurface();
    return data.forget();
  }

  /**
   * Compositor methods
   */
public:
  void AttachNPZC(jni::Object::Param aNPZC) {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aNPZC);

    auto locked(mWindow.Access());
    if (!locked) {
      return;  // Already shut down.
    }

    nsWindow* gkWindow = locked->GetNsWindow();

    // We can have this situation if we get two GeckoViewSupport::Transfer()
    // called before the first AttachNPZC() gets here. Just detach the current
    // instance since that's what happens in GeckoViewSupport::Transfer() as
    // well.
    gkWindow->mNPZCSupport.Detach();

    auto npzc = java::PanZoomController::NativeProvider::LocalRef(
        jni::GetGeckoThreadEnv(),
        java::PanZoomController::NativeProvider::Ref::From(aNPZC));
    gkWindow->mNPZCSupport =
        jni::NativeWeakPtrHolder<NPZCSupport>::Attach(npzc, mWindow, npzc);

    DispatchToUiThread(
        "LayerViewSupport::AttachNPZC",
        [npzc = java::PanZoomController::NativeProvider::GlobalRef(npzc)] {
          npzc->SetAttached(true);
        });
  }

  void OnBoundsChanged(int32_t aLeft, int32_t aTop, int32_t aWidth,
                       int32_t aHeight) {
    MOZ_ASSERT(NS_IsMainThread());
    auto acc = mWindow.Access();
    if (!acc) {
      return;  // Already shut down.
    }

    nsWindow* gkWindow = acc->GetNsWindow();
    if (!gkWindow) {
      return;
    }

    gkWindow->Resize(aLeft, aTop, aWidth, aHeight, /* repaint */ false);
  }

  void NotifyMemoryPressure() {
    MOZ_ASSERT(NS_IsMainThread());
    auto acc = mWindow.Access();
    if (!acc) {
      return;  // Already shut down.
    }

    nsWindow* gkWindow = acc->GetNsWindow();
    if (!gkWindow || !gkWindow->mCompositorBridgeChild) {
      return;
    }

    gkWindow->mCompositorBridgeChild->SendNotifyMemoryPressure();
  }

  void SetDynamicToolbarMaxHeight(int32_t aHeight) {
    MOZ_ASSERT(NS_IsMainThread());
    auto acc = mWindow.Access();
    if (!acc) {
      return;  // Already shut down.
    }

    nsWindow* gkWindow = acc->GetNsWindow();
    if (!gkWindow) {
      return;
    }

    gkWindow->UpdateDynamicToolbarMaxHeight(ScreenIntCoord(aHeight));
  }

  void OnKeyboardHeightChanged(int32_t aHeight) {
    MOZ_ASSERT(NS_IsMainThread());
    auto win(mWindow.Access());
    if (!win) {
      return;  // Already shut down.
    }

    nsWindow* gkWindow = win->GetNsWindow();
    if (!gkWindow) {
      return;
    }

    gkWindow->KeyboardHeightChanged(ScreenIntCoord(aHeight));
  }

  void SyncPauseCompositor() {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    // Set this true prior to attempting to pause the compositor, so that if
    // pausing fails the subsequent recovery knows to initialize the compositor
    // in a paused state.
    mCompositorPaused = true;

    if (mUiCompositorControllerChild) {
      mUiCompositorControllerChild->Pause();

      mSurface = nullptr;
      mSurfaceControl = nullptr;
      if (auto window = mWindow.Access()) {
        nsWindow* gkWindow = window->GetNsWindow();
        if (gkWindow) {
          mUiCompositorControllerChild->OnCompositorSurfaceChanged(
              gkWindow->mWidgetId, nullptr);
        }
      }
    }

    if (auto lock{mWindow.Access()}) {
      while (!mCapturePixelsResults.empty()) {
        auto result =
            java::GeckoResult::LocalRef(mCapturePixelsResults.front().mResult);
        if (result) {
          result->CompleteExceptionally(
              java::sdk::IllegalStateException::New(
                  "The compositor has detached from the session")
                  .Cast<jni::Throwable>());
        }
        mCapturePixelsResults.pop();
      }
    }
  }

  void SyncResumeCompositor() {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    // Set this false prior to attempting to resume the compositor, so that if
    // resumption fails the subsequent recovery knows to initialize the
    // compositor in a resumed state.
    mCompositorPaused = false;

    if (mUiCompositorControllerChild) {
      bool resumed = mUiCompositorControllerChild->Resume();
      if (!resumed) {
        gfxCriticalNote
            << "Failed to resume compositor from SyncResumeCompositor";
        RequestNewSurface();
      }
    }
  }

  void SyncResumeResizeCompositor(
      const GeckoSession::Compositor::LocalRef& aObj, int32_t aX, int32_t aY,
      int32_t aWidth, int32_t aHeight, jni::Object::Param aSurface,
      jni::Object::Param aSurfaceControl) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    // Set this false prior to attempting to resume the compositor, so that if
    // resumption fails the subsequent recovery knows to initialize the
    // compositor in a resumed state.
    mCompositorPaused = false;

    mX = aX;
    mY = aY;
    mWidth = aWidth;
    mHeight = aHeight;
    if (StaticPrefs::widget_android_use_surfacecontrol_AtStartup()) {
      mSurfaceControl =
          java::sdk::SurfaceControl::GlobalRef::From(aSurfaceControl);
    }
    if (mSurfaceControl) {
      // When using SurfaceControl, we create a child Surface to render in to
      // rather than rendering directly in to the Surface provided by the
      // application. This allows us to work around a bug on some versions of
      // Android when recovering from a GPU process crash.
      mSurface = java::SurfaceControlManager::GetInstance()->GetChildSurface(
          mSurfaceControl, mWidth, mHeight);
    } else {
      mSurface = java::sdk::Surface::GlobalRef::From(aSurface);
    }

    if (mUiCompositorControllerChild) {
      if (auto window = mWindow.Access()) {
        nsWindow* gkWindow = window->GetNsWindow();
        if (gkWindow) {
          // Send new Surface to GPU process, if one exists.
          mUiCompositorControllerChild->OnCompositorSurfaceChanged(
              gkWindow->mWidgetId, mSurface);
        }
      }

      bool resumed = mUiCompositorControllerChild->ResumeAndResize(
          aX, aY, aWidth, aHeight);
      if (!resumed) {
        gfxCriticalNote
            << "Failed to resume compositor from SyncResumeResizeCompositor";
        // Only request a new Surface if this SyncResumeAndResize call is not
        // response to a previous request, otherwise we will get stuck in an
        // infinite loop.
        if (!mRequestedNewSurface) {
          RequestNewSurface();
        }
        return;
      }
    }

    mRequestedNewSurface = false;

    class OnResumedEvent : public nsAppShell::Event {
      GeckoSession::Compositor::GlobalRef mCompositor;

     public:
      explicit OnResumedEvent(GeckoSession::Compositor::GlobalRef&& aCompositor)
          : mCompositor(std::move(aCompositor)) {}

      void Run() override {
        MOZ_ASSERT(NS_IsMainThread());

        JNIEnv* const env = jni::GetGeckoThreadEnv();
        const auto lvsHolder =
            GetNative(GeckoSession::Compositor::LocalRef(env, mCompositor));

        if (!lvsHolder) {
          env->ExceptionClear();
          return;  // Already shut down.
        }

        auto lvs(lvsHolder->Access());
        if (!lvs) {
          env->ExceptionClear();
          return;  // Already shut down.
        }

        auto win = lvs->mWindow.Access();
        if (!win) {
          env->ExceptionClear();
          return;  // Already shut down.
        }

        // When we get here, the compositor has already been told to
        // resume. This means it's now safe for layer updates to occur.
        // Since we might have prevented one or more draw events from
        // occurring while the compositor was paused, we need to
        // schedule a draw event now.
        if (!lvs->mCompositorPaused) {
          nsWindow* const gkWindow = win->GetNsWindow();
          if (gkWindow) {
            gkWindow->RedrawAll();
          }
        }
      }
    };

    // Use priority queue for timing-sensitive event.
    nsAppShell::PostEvent(
        MakeUnique<LayerViewEvent>(MakeUnique<OnResumedEvent>(aObj)));
  }

  void RequestNewSurface() {
    if (const auto& compositor = GetJavaCompositor()) {
      mRequestedNewSurface = true;
      if (mSurfaceControl) {
        java::SurfaceControlManager::GetInstance()->RemoveSurface(
            mSurfaceControl);
      }
      compositor->RequestNewSurface();
    }
  }

  mozilla::jni::Object::LocalRef GetMagnifiableSurface() {
    return mozilla::jni::Object::LocalRef::From(GetSurface());
  }

  void SyncInvalidateAndScheduleComposite() {
    if (!mUiCompositorControllerChild) {
      return;
    }

    if (AndroidBridge::IsJavaUiThread()) {
      mUiCompositorControllerChild->InvalidateAndRender();
      return;
    }

    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
      uiThread->Dispatch(NewRunnableMethod<>(
                             "LayerViewSupport::InvalidateAndRender",
                             mUiCompositorControllerChild,
                             &UiCompositorControllerChild::InvalidateAndRender),
                         nsIThread::DISPATCH_NORMAL);
    }
  }

  void SetMaxToolbarHeight(int32_t aHeight) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());

    if (mUiCompositorControllerChild) {
      mUiCompositorControllerChild->SetMaxToolbarHeight(aHeight);
    }
  }

  void SetFixedBottomOffset(int32_t aOffset) {
    if (auto acc{mWindow.Access()}) {
      nsWindow* gkWindow = acc->GetNsWindow();
      if (gkWindow) {
        gkWindow->UpdateDynamicToolbarOffset(ScreenIntCoord(aOffset));
      }
    }

    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
      uiThread->Dispatch(NS_NewRunnableFunction(
          "LayerViewSupport::SetFixedBottomOffset", [this, offset = aOffset] {
            if (mUiCompositorControllerChild) {
              mUiCompositorControllerChild->SetFixedBottomOffset(offset);
            }
          }));
    }
  }

  void SendToolbarAnimatorMessage(int32_t aMessage) {
    if (!mUiCompositorControllerChild) {
      return;
    }

    if (AndroidBridge::IsJavaUiThread()) {
      mUiCompositorControllerChild->ToolbarAnimatorMessageFromUI(aMessage);
      return;
    }

    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
      uiThread->Dispatch(
          NewRunnableMethod<int32_t>(
              "LayerViewSupport::ToolbarAnimatorMessageFromUI",
              mUiCompositorControllerChild,
              &UiCompositorControllerChild::ToolbarAnimatorMessageFromUI,
              aMessage),
          nsIThread::DISPATCH_NORMAL);
    }
  }

  void RecvToolbarAnimatorMessage(int32_t aMessage) {
    auto compositor = GeckoSession::Compositor::LocalRef(mCompositor);
    if (compositor) {
      compositor->RecvToolbarAnimatorMessage(aMessage);
    }
  }

  void SetDefaultClearColor(int32_t aColor) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
    mDefaultClearColor = Some((uint32_t)aColor);
    if (mUiCompositorControllerChild) {
      mUiCompositorControllerChild->SetDefaultClearColor((uint32_t)aColor);
    }
  }

  void RequestScreenPixels(jni::Object::Param aResult,
                           jni::Object::Param aTarget, int32_t aXOffset,
                           int32_t aYOffset, int32_t aSrcWidth,
                           int32_t aSrcHeight, int32_t aOutWidth,
                           int32_t aOutHeight) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
    auto result = java::GeckoResult::LocalRef(aResult);

    if (!mUiCompositorControllerChild) {
      if (result) {
        if (auto window = mWindow.Access()) {
          result->CompleteExceptionally(
              java::sdk::IllegalStateException::New(
                  "Compositor session lost prior to screen pixels request")
                  .Cast<jni::Throwable>());
        }
      }
      return;
    }

    int size = 0;
    if (auto window = mWindow.Access()) {
      mCapturePixelsResults.push(CaptureRequest(
          java::GeckoResult::GlobalRef(result),
          java::sdk::Bitmap::GlobalRef(java::sdk::Bitmap::LocalRef(aTarget)),
          ScreenRect(aXOffset, aYOffset, aSrcWidth, aSrcHeight),
          IntSize(aOutWidth, aOutHeight)));
      size = mCapturePixelsResults.size();
    }

    if (size == 1) {
      mUiCompositorControllerChild->RequestScreenPixels();
    }
  }

  void RecvScreenPixels(Shmem&& aMem, const ScreenIntSize& aSize,
                        bool aNeedsYFlip) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
    CaptureRequest request;
    java::GeckoResult::LocalRef result = nullptr;
    java::sdk::Bitmap::LocalRef bitmap = nullptr;
    if (auto window = mWindow.Access()) {
      // The result might have been already rejected if the compositor was
      // detached from the session
      if (!mCapturePixelsResults.empty()) {
        request = mCapturePixelsResults.front();
        result = java::GeckoResult::LocalRef(request.mResult);
        bitmap = java::sdk::Bitmap::LocalRef(request.mBitmap);
        mCapturePixelsResults.pop();
      }
    }

    if (result) {
      if (bitmap) {
        RefPtr<DataSourceSurface> surf;
        if (aNeedsYFlip) {
          surf = FlipScreenPixels(aMem, aSize, request.mSource,
                                  request.mOutputSize);
        } else {
          surf = gfx::Factory::CreateWrappingDataSourceSurface(
              aMem.get<uint8_t>(),
              StrideForFormatAndWidth(SurfaceFormat::B8G8R8A8, aSize.width),
              IntSize(aSize.width, aSize.height), SurfaceFormat::B8G8R8A8);
        }
        if (surf) {
          DataSourceSurface::ScopedMap smap(surf, DataSourceSurface::READ);
          auto pixels = mozilla::jni::ByteBuffer::New(
              reinterpret_cast<int8_t*>(smap.GetData()),
              smap.GetStride() * request.mOutputSize.height);
          bitmap->CopyPixelsFromBuffer(pixels);
          result->Complete(bitmap);
        } else {
          result->CompleteExceptionally(
              java::sdk::IllegalStateException::New(
                  "Failed to create flipped snapshot surface (probably out "
                  "of memory)")
                  .Cast<jni::Throwable>());
        }
      } else {
        result->CompleteExceptionally(java::sdk::IllegalArgumentException::New(
                                          "No target bitmap argument provided")
                                          .Cast<jni::Throwable>());
      }
    }

    // Pixels have been copied, so Dealloc Shmem
    if (mUiCompositorControllerChild) {
      mUiCompositorControllerChild->DeallocPixelBuffer(aMem);

      if (auto window = mWindow.Access()) {
        if (!mCapturePixelsResults.empty()) {
          mUiCompositorControllerChild->RequestScreenPixels();
        }
      }
    }
  }

  void EnableLayerUpdateNotifications(bool aEnable) {
    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
    if (mUiCompositorControllerChild) {
      mUiCompositorControllerChild->EnableLayerUpdateNotifications(aEnable);
    }
  }

  void OnSafeAreaInsetsChanged(int32_t aTop, int32_t aRight, int32_t aBottom,
                               int32_t aLeft) {
    MOZ_ASSERT(NS_IsMainThread());
    auto win(mWindow.Access());
    if (!win) {
      return;  // Already shut down.
    }

    nsWindow* gkWindow = win->GetNsWindow();
    if (!gkWindow) {
      return;
    }

    LayoutDeviceIntMargin safeAreaInsets(aTop, aRight, aBottom, aLeft);
    gkWindow->UpdateSafeAreaInsets(safeAreaInsets);
  }
};

GeckoViewSupport::~GeckoViewSupport() {
  if (mWindow) {
    mWindow->DetachNatives();
  }
}

/* static */
void GeckoViewSupport::Open(
    const jni::Class::LocalRef& aCls, GeckoSession::Window::Param aWindow,
    jni::Object::Param aQueue, jni::Object::Param aCompositor,
    jni::Object::Param aDispatcher, jni::Object::Param aSessionAccessibility,
    jni::Object::Param aInitData, jni::String::Param aId,
    jni::String::Param aChromeURI, bool aPrivateMode) {
  MOZ_ASSERT(NS_IsMainThread());

  AUTO_PROFILER_LABEL("mozilla::widget::GeckoViewSupport::Open", OTHER);

  // We'll need gfxPlatform to be initialized to create a compositor later.
  // Might as well do that now so that the GPU process launch can get a head
  // start.
  gfxPlatform::GetPlatform();

  nsCOMPtr<nsIWindowWatcher> ww = do_GetService(NS_WINDOWWATCHER_CONTRACTID);
  MOZ_RELEASE_ASSERT(ww);

  nsAutoCString url;
  if (aChromeURI) {
    url = aChromeURI->ToCString();
  } else {
    nsresult rv = Preferences::GetCString("toolkit.defaultChromeURI", url);
    if (NS_FAILED(rv)) {
      url = "chrome://geckoview/content/geckoview.xhtml"_ns;
    }
  }

  // Prepare an nsIGeckoViewView to pass as argument to the window.
  RefPtr<AndroidView> androidView = new AndroidView();
  androidView->mEventDispatcher->Attach(
      java::EventDispatcher::Ref::From(aDispatcher), nullptr);
  androidView->mInitData = java::GeckoBundle::Ref::From(aInitData);

  nsAutoCString chromeFlags("chrome,dialog=0,remote,resizable,scrollbars");
  if (aPrivateMode) {
    chromeFlags += ",private";
  }
  nsCOMPtr<mozIDOMWindowProxy> domWindow;
  ww->OpenWindow(nullptr, url, nsDependentCString(aId->ToCString().get()),
                 chromeFlags, androidView, getter_AddRefs(domWindow));
  MOZ_RELEASE_ASSERT(domWindow);

  nsCOMPtr<nsPIDOMWindowOuter> pdomWindow = nsPIDOMWindowOuter::From(domWindow);
  const RefPtr<nsWindow> window = nsWindow::From(pdomWindow);
  MOZ_ASSERT(window);

  // Attach a new GeckoView support object to the new window.
  GeckoSession::Window::LocalRef sessionWindow(aCls.Env(), aWindow);
  auto weakGeckoViewSupport =
      jni::NativeWeakPtrHolder<GeckoViewSupport>::Attach(
          sessionWindow, window, sessionWindow, pdomWindow);

  window->mGeckoViewSupport = weakGeckoViewSupport;
  window->mAndroidView = androidView;

  // Attach other session support objects.
  {  // Scope for gvsAccess
    auto gvsAccess = weakGeckoViewSupport.Access();
    MOZ_ASSERT(gvsAccess);

    gvsAccess->Transfer(sessionWindow, aQueue, aCompositor, aDispatcher,
                        aSessionAccessibility, aInitData);
  }

  if (window->mWidgetListener) {
    nsCOMPtr<nsIAppWindow> appWindow(window->mWidgetListener->GetAppWindow());
    if (appWindow) {
      // Our window is not intrinsically sized, so tell AppWindow to
      // not set a size for us.
      appWindow->SetIntrinsicallySized(false);
    }
  }
}

void GeckoViewSupport::Close() {
  if (mWindow) {
    if (mWindow->mAndroidView) {
      mWindow->mAndroidView->mEventDispatcher->Detach();
    }
    mWindow = nullptr;
  }

  if (!mDOMWindow) {
    return;
  }

  mDOMWindow->ForceClose();
  mDOMWindow = nullptr;
  mGeckoViewWindow = nullptr;
}

void GeckoViewSupport::Transfer(const GeckoSession::Window::LocalRef& inst,
                                jni::Object::Param aQueue,
                                jni::Object::Param aCompositor,
                                jni::Object::Param aDispatcher,
                                jni::Object::Param aSessionAccessibility,
                                jni::Object::Param aInitData) {
  mWindow->mNPZCSupport.Detach();

  auto compositor = GeckoSession::Compositor::LocalRef(
      inst.Env(), GeckoSession::Compositor::Ref::From(aCompositor));

  bool attachLvs;
  {  // Scope for lvsAccess
    auto lvsAccess{mWindow->mLayerViewSupport.Access()};
    // If we do not yet have mLayerViewSupport, or if the compositor has
    // changed, then we must attach a new one.
    attachLvs = !lvsAccess || lvsAccess->GetJavaCompositor() != compositor;
  }

  if (attachLvs) {
    mWindow->mLayerViewSupport =
        jni::NativeWeakPtrHolder<LayerViewSupport>::Attach(
            compositor, mWindow->mGeckoViewSupport, compositor);

    if (RefPtr<UiCompositorControllerChild> uiCompositorController =
            mWindow->GetUiCompositorControllerChild()) {
      DispatchToUiThread(
          "LayerViewSupport::NotifyCompositorCreated",
          [lvs = mWindow->mLayerViewSupport, uiCompositorController] {
            if (auto lvsAccess{lvs.Access()}) {
--> --------------------

--> maximum size reached

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

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