// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/render_widget_host_view_base.h"

#include "base/check.h"
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/observer_list.h"
#include "base/unguessable_token.h"
#include "build/build_config.h"
#include "components/viz/common/features.h"
#include "components/viz/common/surfaces/subtree_capture_id.h"
#include "components/viz/host/host_frame_sink_manager.h"
#include "content/browser/compositor/surface_utils.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/browser/renderer_host/delegated_frame_host.h"
#include "content/browser/renderer_host/input/mouse_wheel_phase_handler.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_delegate.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
#include "content/browser/renderer_host/render_widget_host_owner_delegate.h"
#include "content/browser/renderer_host/render_widget_host_view_base_observer.h"
#include "content/browser/renderer_host/render_widget_host_view_child_frame.h"
#include "content/browser/renderer_host/text_input_manager.h"
#include "content/browser/renderer_host/visible_time_request_trigger.h"
#include "content/common/content_switches_internal.h"
#include "content/common/input/event_with_latency_info.h"
#include "content/public/common/page_visibility_state.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/blink/public/mojom/frame/intrinsic_sizing_info.mojom.h"
#include "ui/base/ui_base_types.h"
#include "ui/display/display_util.h"
#include "ui/display/screen.h"
#include "ui/events/event.h"
#include "ui/events/keycodes/dom/dom_code.h"
#include "ui/gfx/geometry/dip_util.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/size_f.h"

namespace content {

RenderWidgetHostViewBase::RenderWidgetHostViewBase(RenderWidgetHost* host)
    : host_(RenderWidgetHostImpl::From(host)),
      // `screen_infos_` must be initialized, to permit unconditional access to
      // its current display. A placeholder ScreenInfo is used here, so the
      // first call to UpdateScreenInfo will trigger the expected updates.
      screen_infos_(display::ScreenInfos(display::ScreenInfo())) {}

RenderWidgetHostViewBase::~RenderWidgetHostViewBase() {
  DCHECK(!keyboard_locked_);
  DCHECK(!IsMouseLocked());
  // We call this here to guarantee that observers are notified before we go
  // away. However, some subclasses may wish to call this earlier in their
  // shutdown process, e.g. to force removal from
  // RenderWidgetHostInputEventRouter's surface map before relinquishing a
  // host pointer. There is no harm in calling NotifyObserversAboutShutdown()
  // twice, as the observers are required to de-register on the first call, and
  // so the second call does nothing.
  NotifyObserversAboutShutdown();
  // If we have a live reference to |text_input_manager_|, we should unregister
  // so that the |text_input_manager_| will free its state.
  if (text_input_manager_)
    text_input_manager_->Unregister(this);
}

RenderWidgetHostImpl* RenderWidgetHostViewBase::GetFocusedWidget() const {
  return host() && host()->delegate()
             ? host()->delegate()->GetFocusedRenderWidgetHost(host())
             : nullptr;
}

RenderWidgetHost* RenderWidgetHostViewBase::GetRenderWidgetHost() {
  return host();
}

void RenderWidgetHostViewBase::SetContentBackgroundColor(SkColor color) {
  if (content_background_color_ == color)
    return;

  content_background_color_ = color;
  UpdateBackgroundColor();
}

void RenderWidgetHostViewBase::NotifyObserversAboutShutdown() {
  // Note: RenderWidgetHostInputEventRouter is an observer, and uses the
  // following notification to remove this view from its surface owners map.
  for (auto& observer : observers_)
    observer.OnRenderWidgetHostViewBaseDestroyed(this);
  // All observers are required to disconnect after they are notified.
  DCHECK(observers_.empty());
}

MouseWheelPhaseHandler* RenderWidgetHostViewBase::GetMouseWheelPhaseHandler() {
  return nullptr;
}

void RenderWidgetHostViewBase::StopFlingingIfNecessary(
    const blink::WebGestureEvent& event,
    blink::mojom::InputEventResultState ack_result) {
  // Reset view_stopped_flinging_for_test_ at the beginning of the scroll
  // sequence.
  if (event.GetType() == blink::WebInputEvent::Type::kGestureScrollBegin)
    view_stopped_flinging_for_test_ = false;

  bool processed = blink::mojom::InputEventResultState::kConsumed == ack_result;
  if (!processed &&
      event.GetType() == blink::WebInputEvent::Type::kGestureScrollUpdate &&
      event.data.scroll_update.inertial_phase ==
          blink::WebGestureEvent::InertialPhaseState::kMomentum &&
      event.SourceDevice() != blink::WebGestureDevice::kSyntheticAutoscroll) {
    StopFling();
    view_stopped_flinging_for_test_ = true;
  }
}

void RenderWidgetHostViewBase::UpdateIntrinsicSizingInfo(
    blink::mojom::IntrinsicSizingInfoPtr sizing_info) {}

gfx::Size RenderWidgetHostViewBase::GetCompositorViewportPixelSize() {
  return gfx::ScaleToCeiledSize(GetRequestedRendererSize(),
                                GetDeviceScaleFactor());
}

void RenderWidgetHostViewBase::SelectionBoundsChanged(
    const gfx::Rect& anchor_rect,
    base::i18n::TextDirection anchor_dir,
    const gfx::Rect& focus_rect,
    base::i18n::TextDirection focus_dir,
    const gfx::Rect& bounding_box,
    bool is_anchor_first) {
#if !BUILDFLAG(IS_ANDROID)
  if (GetTextInputManager())
    GetTextInputManager()->SelectionBoundsChanged(
        this, anchor_rect, anchor_dir, focus_rect, focus_dir, bounding_box,
        is_anchor_first);
#else
  NOTREACHED() << "Selection bounds should be routed through the compositor.";
#endif
}

int RenderWidgetHostViewBase::GetMouseWheelMinimumGranularity() const {
  // Most platforms can specify the floating-point delta in the wheel event so
  // they don't have a minimum granularity. Android is currently the only
  // platform that overrides this.
  return 0;
}

RenderWidgetHostViewBase* RenderWidgetHostViewBase::GetRootView() {
  return this;
}

void RenderWidgetHostViewBase::SelectionChanged(const std::u16string& text,
                                                size_t offset,
                                                const gfx::Range& range) {
  if (GetTextInputManager())
    GetTextInputManager()->SelectionChanged(this, text, offset, range);
}

gfx::Size RenderWidgetHostViewBase::GetRequestedRendererSize() {
  return GetViewBounds().size();
}

uint32_t RenderWidgetHostViewBase::GetCaptureSequenceNumber() const {
  // TODO(vmpstr): Implement this for overrides other than aura and child frame.
  NOTIMPLEMENTED_LOG_ONCE();
  return 0u;
}

ui::TextInputClient* RenderWidgetHostViewBase::GetTextInputClient() {
  return nullptr;
}

viz::FrameSinkId RenderWidgetHostViewBase::GetRootFrameSinkId() {
  return viz::FrameSinkId();
}

bool RenderWidgetHostViewBase::IsSurfaceAvailableForCopy() {
  return false;
}

void RenderWidgetHostViewBase::CopyMainAndPopupFromSurface(
    base::WeakPtr<RenderWidgetHostImpl> main_host,
    base::WeakPtr<DelegatedFrameHost> main_frame_host,
    base::WeakPtr<RenderWidgetHostImpl> popup_host,
    base::WeakPtr<DelegatedFrameHost> popup_frame_host,
    const gfx::Rect& src_subrect,
    const gfx::Size& dst_size,
    float scale_factor,
    base::OnceCallback<void(const SkBitmap&)> callback) {
  if (!main_host || !main_frame_host)
    return;

#if BUILDFLAG(IS_ANDROID)
  NOTREACHED()
      << "RenderWidgetHostViewAndroid::CopyFromSurface calls "
         "DelegatedFrameHostAndroid::CopyFromCompositingSurface directly, "
         "and popups are not supported.";
  return;
#else
  if (!popup_host || !popup_frame_host) {
    // No popup - just call CopyFromCompositingSurface once.
    main_frame_host->CopyFromCompositingSurface(src_subrect, dst_size,
                                                std::move(callback));
    return;
  }

  // First locate the popup relative to the main page, in DIPs
  const gfx::Point parent_location =
      main_host->GetView()->GetBoundsInRootWindow().origin();
  const gfx::Point popup_location =
      popup_host->GetView()->GetBoundsInRootWindow().origin();
  const gfx::Point offset_dips =
      PointAtOffsetFromOrigin(popup_location - parent_location);
  const gfx::Vector2d offset_physical =
      ScaleToFlooredPoint(offset_dips, scale_factor).OffsetFromOrigin();

  // Queue up the request for the MAIN frame image first, but with a
  // callback that launches a second request for the popup image.
  //  1. Call CopyFromCompositingSurface for the main frame, with callback
  //     |main_image_done_callback|. Inside |main_image_done_callback|:
  //    a. Call CopyFromCompositingSurface again, this time on the popup
  //       frame. For this call, build a new callback, |popup_done_callback|,
  //       which:
  //      i. Takes the main image as a parameter, combines the main image with
  //         the just-acquired popup image, and then calls the original
  //         (outer) callback with the combined image.
  auto main_image_done_callback = base::BindOnce(
      [](base::OnceCallback<void(const SkBitmap&)> final_callback,
         const gfx::Vector2d offset,
         base::WeakPtr<DelegatedFrameHost> popup_frame_host,
         const gfx::Rect src_subrect, const gfx::Size dst_size,
         const SkBitmap& main_image) {
        if (!popup_frame_host)
          return;

        // Build a new callback that actually combines images.
        auto popup_done_callback = base::BindOnce(
            [](base::OnceCallback<void(const SkBitmap&)> final_callback,
               const gfx::Vector2d offset, const SkBitmap& main_image,
               const SkBitmap& popup_image) {
              // Draw popup_image into main_image.
              SkCanvas canvas(main_image, SkSurfaceProps{});
              canvas.drawImage(popup_image.asImage(), offset.x(), offset.y());
              std::move(final_callback).Run(main_image);
            },
            std::move(final_callback), offset, std::move(main_image));

        // Second, request the popup image.
        gfx::Rect popup_subrect(src_subrect - offset);
        popup_frame_host->CopyFromCompositingSurface(
            popup_subrect, dst_size, std::move(popup_done_callback));
      },
      std::move(callback), offset_physical, popup_frame_host, src_subrect,
      dst_size);

  // Request the main image (happens first).
  main_frame_host->CopyFromCompositingSurface(
      src_subrect, dst_size, std::move(main_image_done_callback));
#endif
}

void RenderWidgetHostViewBase::CopyFromSurface(
    const gfx::Rect& src_rect,
    const gfx::Size& output_size,
    base::OnceCallback<void(const SkBitmap&)> callback) {
  NOTIMPLEMENTED_LOG_ONCE();
  std::move(callback).Run(SkBitmap());
}

void RenderWidgetHostViewBase::CopyFromExactSurface(
    const gfx::Rect& src_rect,
    const gfx::Size& output_size,
    base::OnceCallback<void(const SkBitmap&)> callback) {
  NOTIMPLEMENTED_LOG_ONCE();
  std::move(callback).Run(SkBitmap());
}

std::unique_ptr<viz::ClientFrameSinkVideoCapturer>
RenderWidgetHostViewBase::CreateVideoCapturer() {
  std::unique_ptr<viz::ClientFrameSinkVideoCapturer> video_capturer =
      GetHostFrameSinkManager()->CreateVideoCapturer();
  video_capturer->ChangeTarget(viz::VideoCaptureTarget(GetFrameSinkId()),
                               /*sub_capture_target_version=*/0);
  return video_capturer;
}

std::u16string RenderWidgetHostViewBase::GetSelectedText() {
  if (!GetTextInputManager())
    return std::u16string();
  return GetTextInputManager()->GetTextSelection(this)->selected_text();
}

void RenderWidgetHostViewBase::SetBackgroundColor(SkColor color) {
  // TODO(danakj): OPAQUE colors only make sense for main frame widgets,
  // as child frames are always transparent background. We should move this to
  // `blink::WebView` instead.
  DCHECK(SkColorGetA(color) == SK_AlphaOPAQUE ||
         SkColorGetA(color) == SK_AlphaTRANSPARENT);
  if (default_background_color_ == color)
    return;

  bool opaque = default_background_color_
                    ? SkColorGetA(*default_background_color_)
                    : SK_AlphaOPAQUE;
  default_background_color_ = color;
  UpdateBackgroundColor();
  if (opaque != (SkColorGetA(color) == SK_AlphaOPAQUE)) {
    if (host()->owner_delegate()) {
      host()->owner_delegate()->SetBackgroundOpaque(SkColorGetA(color) ==
                                                    SK_AlphaOPAQUE);
    }
  }
}

absl::optional<SkColor> RenderWidgetHostViewBase::GetBackgroundColor() {
  if (content_background_color_)
    return content_background_color_;
  return default_background_color_;
}

bool RenderWidgetHostViewBase::IsBackgroundColorOpaque() {
  absl::optional<SkColor> bg_color = GetBackgroundColor();
  return bg_color ? SkColorGetA(*bg_color) == SK_AlphaOPAQUE : true;
}

void RenderWidgetHostViewBase::CopyBackgroundColorIfPresentFrom(
    const RenderWidgetHostView& other) {
  const RenderWidgetHostViewBase& other_base =
      static_cast<const RenderWidgetHostViewBase&>(other);
  if (!other_base.content_background_color_ &&
      !other_base.default_background_color_) {
    return;
  }
  if (content_background_color_ == other_base.content_background_color_ &&
      default_background_color_ == other_base.default_background_color_) {
    return;
  }
  bool was_opaque = IsBackgroundColorOpaque();
  content_background_color_ = other_base.content_background_color_;
  default_background_color_ = other_base.default_background_color_;
  UpdateBackgroundColor();
  bool opaque = IsBackgroundColorOpaque();
  if (was_opaque != opaque && host()->owner_delegate()) {
    host()->owner_delegate()->SetBackgroundOpaque(opaque);
  }
}

bool RenderWidgetHostViewBase::IsMouseLocked() {
  return false;
}

bool RenderWidgetHostViewBase::GetIsMouseLockedUnadjustedMovementForTesting() {
  return false;
}

bool RenderWidgetHostViewBase::CanBeMouseLocked() {
  return HasFocus();
}

bool RenderWidgetHostViewBase::AccessibilityHasFocus() {
  return HasFocus();
}

bool RenderWidgetHostViewBase::LockKeyboard(
    absl::optional<base::flat_set<ui::DomCode>> codes) {
  NOTIMPLEMENTED_LOG_ONCE();
  return false;
}

void RenderWidgetHostViewBase::UnlockKeyboard() {
  NOTIMPLEMENTED_LOG_ONCE();
}

bool RenderWidgetHostViewBase::IsKeyboardLocked() {
  return keyboard_locked_;
}

base::flat_map<std::string, std::string>
RenderWidgetHostViewBase::GetKeyboardLayoutMap() {
  NOTIMPLEMENTED_LOG_ONCE();
  return base::flat_map<std::string, std::string>();
}

blink::mojom::InputEventResultState RenderWidgetHostViewBase::FilterInputEvent(
    const blink::WebInputEvent& input_event) {
  // By default, input events are simply forwarded to the renderer.
  return blink::mojom::InputEventResultState::kNotConsumed;
}

void RenderWidgetHostViewBase::WheelEventAck(
    const blink::WebMouseWheelEvent& event,
    blink::mojom::InputEventResultState ack_result) {}

void RenderWidgetHostViewBase::GestureEventAck(
    const blink::WebGestureEvent& event,
    blink::mojom::InputEventResultState ack_result,
    blink::mojom::ScrollResultDataPtr scroll_result_data) {}

void RenderWidgetHostViewBase::ChildDidAckGestureEvent(
    const blink::WebGestureEvent& event,
    blink::mojom::InputEventResultState ack_result,
    blink::mojom::ScrollResultDataPtr scroll_result_data) {}

void RenderWidgetHostViewBase::ForwardTouchpadZoomEventIfNecessary(
    const blink::WebGestureEvent& event,
    blink::mojom::InputEventResultState ack_result) {
  if (!event.IsTouchpadZoomEvent())
    return;
  if (!event.NeedsWheelEvent())
    return;

  switch (event.GetType()) {
    case blink::WebInputEvent::Type::kGesturePinchBegin:
      // Don't send the begin event until we get the first unconsumed update, so
      // that we elide pinch gesture steams consisting of only a begin and end.
      pending_touchpad_pinch_begin_ = event;
      pending_touchpad_pinch_begin_->SetNeedsWheelEvent(false);
      break;
    case blink::WebInputEvent::Type::kGesturePinchUpdate:
      if (ack_result != blink::mojom::InputEventResultState::kConsumed &&
          !event.data.pinch_update.zoom_disabled) {
        if (pending_touchpad_pinch_begin_) {
          host()->ForwardGestureEvent(*pending_touchpad_pinch_begin_);
          pending_touchpad_pinch_begin_.reset();
        }
        // Now that the synthetic wheel event has gone unconsumed, we have the
        // pinch event actually change the page scale.
        blink::WebGestureEvent pinch_event(event);
        pinch_event.SetNeedsWheelEvent(false);
        host()->ForwardGestureEvent(pinch_event);
      }
      break;
    case blink::WebInputEvent::Type::kGesturePinchEnd:
      if (pending_touchpad_pinch_begin_) {
        pending_touchpad_pinch_begin_.reset();
      } else {
        blink::WebGestureEvent pinch_end_event(event);
        pinch_end_event.SetNeedsWheelEvent(false);
        host()->ForwardGestureEvent(pinch_end_event);
      }
      break;
    case blink::WebInputEvent::Type::kGestureDoubleTap:
      if (ack_result != blink::mojom::InputEventResultState::kConsumed) {
        blink::WebGestureEvent double_tap(event);
        double_tap.SetNeedsWheelEvent(false);
        // TODO(mcnee): Support double-tap zoom gesture for OOPIFs. For now,
        // we naively send this to the main frame. If this is over an OOPIF,
        // then the iframe element will incorrectly be used for the scale
        // calculation rather than the element in the OOPIF.
        // https://crbug.com/758348
        host()->ForwardGestureEvent(double_tap);
      }
      break;
    default:
      NOTREACHED();
  }
}

bool RenderWidgetHostViewBase::HasFallbackSurface() const {
  NOTREACHED();
  return false;
}

void RenderWidgetHostViewBase::SetWidgetType(WidgetType widget_type) {
  widget_type_ = widget_type;
}

WidgetType RenderWidgetHostViewBase::GetWidgetType() {
  return widget_type_;
}

gfx::AcceleratedWidget
    RenderWidgetHostViewBase::AccessibilityGetAcceleratedWidget() {
  return gfx::kNullAcceleratedWidget;
}

gfx::NativeViewAccessible
    RenderWidgetHostViewBase::AccessibilityGetNativeViewAccessible() {
  return nullptr;
}

gfx::NativeViewAccessible
RenderWidgetHostViewBase::AccessibilityGetNativeViewAccessibleForWindow() {
  return nullptr;
}

bool RenderWidgetHostViewBase::RequestStartStylusWriting() {
  return false;
}

bool RenderWidgetHostViewBase::RequestRepaintForTesting() {
  return false;
}

void RenderWidgetHostViewBase::ProcessAckedTouchEvent(
    const TouchEventWithLatencyInfo& touch,
    blink::mojom::InputEventResultState ack_result) {
  NOTREACHED();
}

// Send system cursor size to the renderer via UpdateScreenInfo().
void RenderWidgetHostViewBase::UpdateSystemCursorSize(
    const gfx::Size& cursor_size) {
  system_cursor_size_ = cursor_size;
  UpdateScreenInfo();
}

void RenderWidgetHostViewBase::UpdateScreenInfo() {
  bool force_sync_visual_properties = false;
  // Delegate, which is usually WebContentsImpl, do not send rect updates for
  // popups as they are not registered as FrameTreeNodes. Instead, send screen
  // rects directly to host and force synchronization of visual properties so
  // that blink knows host changed bounds. This only happens if the change was
  // instantiated by system server/compositor (for example, Wayland, which
  // may reposition a popup if part of it is going to be shown outside a
  // display's work area. Note that Wayland clients cannot know where their
  // windows are located and cannot adjust bounds).
  if (widget_type_ == WidgetType::kPopup) {
    if (host()) {
      force_sync_visual_properties = true;
      host()->SendScreenRects();
    }
  } else {
    if (host() && host()->delegate())
      host()->delegate()->SendScreenRects();
  }

  auto new_screen_infos = GetNewScreenInfosForUpdate();

  if (scale_override_for_capture_ != 1.0f) {
    // If HiDPI capture mode is active, adjust the device scale factor to
    // increase the rendered pixel count. |new_screen_infos| always contains the
    // unmodified original values for the display, and a copy of it is saved in
    // |screen_infos_|, with a modification applied if applicable. When HiDPI
    // mode is turned off (the scale override is 1.0), the original
    // |new_screen_infos| value gets copied unchanged to |screen_infos_|.
    const float old_device_scale_factor =
        new_screen_infos.current().device_scale_factor;
    new_screen_infos.mutable_current().device_scale_factor =
        old_device_scale_factor * scale_override_for_capture_;
    DVLOG(1) << __func__ << ": Overriding device_scale_factor from "
             << old_device_scale_factor << " to "
             << new_screen_infos.current().device_scale_factor
             << " for capture.";
  }

  if (screen_infos_ == new_screen_infos && !force_sync_visual_properties)
    return;

  // We need to look at `orientation_type` which is marked as kUndefined at
  // startup. Unlike `orientation_angle` that uses 0 degrees as the default.
  // This accounts for devices which have a default landscape orientation, such
  // as tablets. We do not want the first UpdateScreenInfo to be treated as a
  // rotation.
  const bool has_rotation_changed =
      screen_infos_.current().orientation_type !=
          display::mojom::ScreenOrientation::kUndefined &&
      screen_infos_.current().orientation_type !=
          new_screen_infos.current().orientation_type;
  screen_infos_ = std::move(new_screen_infos);

  // Notify the associated RenderWidgetHostImpl when screen info has changed.
  // That will synchronize visual properties needed for frame tree rendering
  // and for web platform APIs that expose screen and window info and events.
  if (host()) {
    OnSynchronizedDisplayPropertiesChanged(has_rotation_changed);
    host()->NotifyScreenInfoChanged();
  }
}

void RenderWidgetHostViewBase::UpdateActiveState(bool active) {
  // Send active state through the delegate if there is one to make sure
  // it stays consistent across all widgets in the tab. Not every
  // RenderWidgetHost has a delegate (for example, drop-down widgets).
  if (host()->delegate())
    host()->delegate()->SendActiveState(active);
  else
    host()->SetActive(active);
}

void RenderWidgetHostViewBase::DidUnregisterFromTextInputManager(
    TextInputManager* text_input_manager) {
  DCHECK(text_input_manager && text_input_manager_ == text_input_manager);

  text_input_manager_ = nullptr;
}

void RenderWidgetHostViewBase::EnableAutoResize(const gfx::Size& min_size,
                                                const gfx::Size& max_size) {
  host()->SetAutoResize(true, min_size, max_size);
  host()->SynchronizeVisualProperties();
}

void RenderWidgetHostViewBase::DisableAutoResize(const gfx::Size& new_size) {
  // Note that for some subclasses, such as RenderWidgetHostViewAura, setting
  // the view size may trigger the synchronization on the visual properties. As
  // a result, it may crete the intermediate status that the view size has
  // changed while the auto resize status is obsolete, and then brings
  // unnecessary updates in view layout. Hence we should disable the auto
  // resize before setting the view size.
  host()->SetAutoResize(false, gfx::Size(), gfx::Size());
  if (!new_size.IsEmpty())
    SetSize(new_size);
  host()->SynchronizeVisualProperties();
}

viz::ScopedSurfaceIdAllocator
RenderWidgetHostViewBase::DidUpdateVisualProperties(
    const cc::RenderFrameMetadata& metadata) {
  // This doesn't suppress allocation. Derived classes that need suppression
  // should override this function.
  base::OnceCallback<void()> allocation_task =
      base::BindOnce(&RenderWidgetHostViewBase::SynchronizeVisualProperties,
                     weak_factory_.GetWeakPtr());
  return viz::ScopedSurfaceIdAllocator(std::move(allocation_task));
}

base::WeakPtr<RenderWidgetHostViewBase> RenderWidgetHostViewBase::GetWeakPtr() {
  return weak_factory_.GetWeakPtr();
}

display::ScreenInfo RenderWidgetHostViewBase::GetScreenInfo() const {
  return screen_infos_.current();
}

display::ScreenInfos RenderWidgetHostViewBase::GetScreenInfos() const {
  return screen_infos_;
}

float RenderWidgetHostViewBase::GetDeviceScaleFactor() const {
  return screen_infos_.current().device_scale_factor;
}

void RenderWidgetHostViewBase::SetScaleOverrideForCapture(float scale) {
  DVLOG(1) << __func__ << ": override=" << scale;
  scale_override_for_capture_ = scale;
  UpdateScreenInfo();
}

float RenderWidgetHostViewBase::GetScaleOverrideForCapture() const {
  return scale_override_for_capture_;
}

void RenderWidgetHostViewBase::OnAutoscrollStart() {
  if (!GetMouseWheelPhaseHandler())
    return;

  // End the current scrolling seqeunce when autoscrolling starts.
  GetMouseWheelPhaseHandler()->DispatchPendingWheelEndEvent();
}

gfx::Size RenderWidgetHostViewBase::GetVisibleViewportSize() {
  return GetViewBounds().size();
}

void RenderWidgetHostViewBase::SetInsets(const gfx::Insets& insets) {
  NOTIMPLEMENTED_LOG_ONCE();
}

void RenderWidgetHostViewBase::DisplayCursor(const ui::Cursor& cursor) {
  return;
}

CursorManager* RenderWidgetHostViewBase::GetCursorManager() {
  return nullptr;
}

void RenderWidgetHostViewBase::TransformPointToRootSurface(gfx::PointF* point) {
  return;
}

void RenderWidgetHostViewBase::DidNavigateMainFramePreCommit() {}

void RenderWidgetHostViewBase::OnFrameTokenChangedForView(
    uint32_t frame_token,
    base::TimeTicks activation_time) {
  if (host())
    host()->DidProcessFrame(frame_token, activation_time);
}

bool RenderWidgetHostViewBase::ScreenRectIsUnstableFor(
    const blink::WebInputEvent& event) {
  return false;
}

bool RenderWidgetHostViewBase::ScreenRectIsUnstableForIOv2For(
    const blink::WebInputEvent& event) {
  return false;
}

void RenderWidgetHostViewBase::ProcessMouseEvent(
    const blink::WebMouseEvent& event,
    const ui::LatencyInfo& latency) {
  // TODO(crbug.com/814674): Figure out the reason |host| is null here in all
  // Process* functions.
  if (!host())
    return;

  PreProcessMouseEvent(event);
  host()->ForwardMouseEventWithLatencyInfo(event, latency);
}

void RenderWidgetHostViewBase::ProcessMouseWheelEvent(
    const blink::WebMouseWheelEvent& event,
    const ui::LatencyInfo& latency) {
  if (!host())
    return;
  host()->ForwardWheelEventWithLatencyInfo(event, latency);
}

void RenderWidgetHostViewBase::ProcessTouchEvent(
    const blink::WebTouchEvent& event,
    const ui::LatencyInfo& latency) {
  if (!host())
    return;

  PreProcessTouchEvent(event);
  host()->ForwardTouchEventWithLatencyInfo(event, latency);
}

void RenderWidgetHostViewBase::ProcessGestureEvent(
    const blink::WebGestureEvent& event,
    const ui::LatencyInfo& latency) {
  if (!host())
    return;
  host()->ForwardGestureEventWithLatencyInfo(event, latency);
}

gfx::PointF RenderWidgetHostViewBase::TransformPointToRootCoordSpaceF(
    const gfx::PointF& point) {
  return point;
}

gfx::PointF RenderWidgetHostViewBase::TransformRootPointToViewCoordSpace(
    const gfx::PointF& point) {
  return point;
}

bool RenderWidgetHostViewBase::TransformPointToCoordSpaceForView(
    const gfx::PointF& point,
    RenderWidgetHostViewBase* target_view,
    gfx::PointF* transformed_point) {
  NOTREACHED();
  return true;
}

bool RenderWidgetHostViewBase::IsRenderWidgetHostViewChildFrame() {
  return false;
}

bool RenderWidgetHostViewBase::HasSize() const {
  return true;
}

void RenderWidgetHostViewBase::Show() {
  ShowWithVisibility(PageVisibilityState::kVisible);
}

void RenderWidgetHostViewBase::Destroy() {
  host_ = nullptr;
}

bool RenderWidgetHostViewBase::CanSynchronizeVisualProperties() {
  return true;
}

std::vector<std::unique_ptr<ui::TouchEvent>>
RenderWidgetHostViewBase::ExtractAndCancelActiveTouches() {
  return {};
}

void RenderWidgetHostViewBase::TextInputStateChanged(
    const ui::mojom::TextInputState& text_input_state) {
  if (GetTextInputManager())
    GetTextInputManager()->UpdateTextInputState(this, text_input_state);
}

void RenderWidgetHostViewBase::ImeCancelComposition() {
  if (GetTextInputManager())
    GetTextInputManager()->ImeCancelComposition(this);
}

void RenderWidgetHostViewBase::ImeCompositionRangeChanged(
    const gfx::Range& range,
    const absl::optional<std::vector<gfx::Rect>>& character_bounds,
    const absl::optional<std::vector<gfx::Rect>>& line_bounds) {
  if (GetTextInputManager()) {
    GetTextInputManager()->ImeCompositionRangeChanged(
        this, range, character_bounds, line_bounds);
  }
}

TextInputManager* RenderWidgetHostViewBase::GetTextInputManager() {
  if (text_input_manager_)
    return text_input_manager_;

  if (!host() || !host()->delegate())
    return nullptr;

  // This RWHV needs to be registered with the TextInputManager so that the
  // TextInputManager starts tracking its state, and observing its lifetime.
  text_input_manager_ = host()->delegate()->GetTextInputManager();
  if (text_input_manager_)
    text_input_manager_->Register(this);

  return text_input_manager_;
}

void RenderWidgetHostViewBase::StopFling() {
  if (!host())
    return;

  host()->StopFling();

  // In case of scroll bubbling tells the child's fling controller which is in
  // charge of generating GSUs to stop flinging.
  if (host()->delegate() && host()->delegate()->GetInputEventRouter()) {
    host()->delegate()->GetInputEventRouter()->StopFling();
  }
}

void RenderWidgetHostViewBase::AddObserver(
    RenderWidgetHostViewBaseObserver* observer) {
  observers_.AddObserver(observer);
}

void RenderWidgetHostViewBase::RemoveObserver(
    RenderWidgetHostViewBaseObserver* observer) {
  observers_.RemoveObserver(observer);
}

TouchSelectionControllerClientManager*
RenderWidgetHostViewBase::GetTouchSelectionControllerClientManager() {
  return nullptr;
}

void RenderWidgetHostViewBase::SynchronizeVisualProperties() {
  if (host())
    host()->SynchronizeVisualProperties();
}

display::ScreenInfos RenderWidgetHostViewBase::GetNewScreenInfosForUpdate() {
  // RWHVChildFrame gets its ScreenInfos from the CrossProcessFrameConnector.
  DCHECK(!IsRenderWidgetHostViewChildFrame());

  display::ScreenInfos screen_infos;

  if (auto* screen = display::Screen::GetScreen()) {
    gfx::NativeView native_view = GetNativeView();
    const auto& display = native_view
                              ? screen->GetDisplayNearestView(native_view)
                              : screen->GetPrimaryDisplay();
    screen_infos = screen->GetScreenInfosNearestDisplay(display.id());
  } else {
    // If there is no Screen, create fake ScreenInfos (for tests).
    screen_infos = display::ScreenInfos(display::ScreenInfo());
  }

  // Set system cursor size separately as it's not a property of screen or
  // display.
  screen_infos.system_cursor_size = system_cursor_size_;

  return screen_infos;
}

void RenderWidgetHostViewBase::DidNavigate() {
  if (host())
    host()->SynchronizeVisualProperties();
}

WebContentsAccessibility*
RenderWidgetHostViewBase::GetWebContentsAccessibility() {
  return nullptr;
}

void RenderWidgetHostViewBase::SetTooltipObserverForTesting(
    TooltipObserver* observer) {
  tooltip_observer_for_testing_ = observer;
}

// TODO(wjmaclean): Would it simplify this function if we re-implemented it
// using GetTransformToViewCoordSpace()?
bool RenderWidgetHostViewBase::TransformPointToTargetCoordSpace(
    RenderWidgetHostViewBase* original_view,
    RenderWidgetHostViewBase* target_view,
    const gfx::PointF& point,
    gfx::PointF* transformed_point) const {
  DCHECK(original_view);
  DCHECK(target_view);
  viz::FrameSinkId root_frame_sink_id = original_view->GetRootFrameSinkId();
  if (!root_frame_sink_id.is_valid())
    return false;
  const auto& display_hit_test_query_map =
      GetHostFrameSinkManager()->display_hit_test_query();
  const auto iter = display_hit_test_query_map.find(root_frame_sink_id);
  if (iter == display_hit_test_query_map.end())
    return false;
  viz::HitTestQuery* query = iter->second.get();

  std::vector<viz::FrameSinkId> target_ancestors;
  target_ancestors.push_back(target_view->GetFrameSinkId());

  RenderWidgetHostViewBase* cur_view = target_view;
  while (cur_view->IsRenderWidgetHostViewChildFrame()) {
    cur_view =
        static_cast<RenderWidgetHostViewChildFrame*>(cur_view)->GetParentView();
    if (!cur_view)
      return false;
    target_ancestors.push_back(cur_view->GetFrameSinkId());
  }
  if (target_ancestors.back() != root_frame_sink_id)
    target_ancestors.push_back(root_frame_sink_id);

  float device_scale_factor = original_view->GetDeviceScaleFactor();
  DCHECK_GT(device_scale_factor, 0.0f);
  // TODO(crbug.com/966995): Optimize so that |point_in_pixels| doesn't need to
  // be in the coordinate space of the root surface in HitTestQuery.
  gfx::Transform transform_root_to_original;
  query->GetTransformToTarget(original_view->GetFrameSinkId(),
                              &transform_root_to_original);
  const absl::optional<gfx::PointF> point_in_pixels =
      transform_root_to_original.InverseMapPoint(
          gfx::ConvertPointToPixels(point, device_scale_factor));
  if (!point_in_pixels.has_value())
    return false;
  gfx::PointF transformed_point_in_physical_pixels;
  if (!query->TransformLocationForTarget(
          target_ancestors, *point_in_pixels,
          &transformed_point_in_physical_pixels)) {
    return false;
  }
  *transformed_point = gfx::ConvertPointToDips(
      transformed_point_in_physical_pixels, device_scale_factor);
  return true;
}

bool RenderWidgetHostViewBase::GetTransformToViewCoordSpace(
    RenderWidgetHostViewBase* target_view,
    gfx::Transform* transform) {
  DCHECK(transform);
  if (target_view == this) {
    transform->MakeIdentity();
    return true;
  }

  viz::FrameSinkId root_frame_sink_id = GetRootFrameSinkId();
  if (!root_frame_sink_id.is_valid())
    return false;

  const auto& display_hit_test_query_map =
      GetHostFrameSinkManager()->display_hit_test_query();
  const auto iter = display_hit_test_query_map.find(root_frame_sink_id);
  if (iter == display_hit_test_query_map.end())
    return false;
  viz::HitTestQuery* query = iter->second.get();

  gfx::Transform transform_this_to_root;
  if (GetFrameSinkId() != root_frame_sink_id) {
    gfx::Transform transform_root_to_this;
    if (!query->GetTransformToTarget(GetFrameSinkId(), &transform_root_to_this))
      return false;
    if (!transform_root_to_this.GetInverse(&transform_this_to_root))
      return false;
  }
  gfx::Transform transform_root_to_target;
  if (!query->GetTransformToTarget(target_view->GetFrameSinkId(),
                                   &transform_root_to_target)) {
    return false;
  }

  // TODO(wjmaclean): In TransformPointToTargetCoordSpace the device scale
  // factor is taken from the original view ... does that matter? Presumably
  // all the views have the same dsf.
  float device_scale_factor = GetDeviceScaleFactor();
  gfx::Transform transform_to_pixel;
  transform_to_pixel.Scale(device_scale_factor, device_scale_factor);
  gfx::Transform transform_from_pixel;
  transform_from_pixel.Scale(1.f / device_scale_factor,
                             1.f / device_scale_factor);

  // Note: gfx::Transform includes optimizations to early-out for scale = 1 or
  // concatenating an identity matrix, so we don't add those checks here.
  transform->MakeIdentity();

  transform->PostConcat(transform_to_pixel);
  transform->PostConcat(transform_this_to_root);
  transform->PostConcat(transform_root_to_target);
  transform->PostConcat(transform_from_pixel);

  return true;
}

bool RenderWidgetHostViewBase::TransformPointToLocalCoordSpace(
    const gfx::PointF& point,
    const viz::SurfaceId& original_surface,
    gfx::PointF* transformed_point) {
  viz::FrameSinkId original_frame_sink_id = original_surface.frame_sink_id();
  viz::FrameSinkId target_frame_sink_id = GetFrameSinkId();
  if (!original_frame_sink_id.is_valid() || !target_frame_sink_id.is_valid())
    return false;
  if (original_frame_sink_id == target_frame_sink_id)
    return true;
  if (!host() || !host()->delegate())
    return false;
  auto* router = host()->delegate()->GetInputEventRouter();
  if (!router)
    return false;
  *transformed_point = point;
  return TransformPointToTargetCoordSpace(
      router->FindViewFromFrameSinkId(original_frame_sink_id),
      router->FindViewFromFrameSinkId(target_frame_sink_id), point,
      transformed_point);
}

ui::Compositor* RenderWidgetHostViewBase::GetCompositor() {
  return nullptr;
}

ui::mojom::VirtualKeyboardMode
RenderWidgetHostViewBase::GetVirtualKeyboardMode() {
  // Only platforms supporting these APIs will implement this.
  return ui::mojom::VirtualKeyboardMode::kUnset;
}

bool RenderWidgetHostViewBase::IsHTMLFormPopup() const {
  return false;
}

void RenderWidgetHostViewBase::OnShowWithPageVisibility(
    PageVisibilityState page_visibility) {
  if (!host())
    return;

  VisibleTimeRequestTrigger& visible_time_request_trigger =
      host_->GetVisibleTimeRequestTrigger();

  // NB: don't call visible_time_request_trigger.TakeRequest() unless the
  // request will be used. If it isn't used here it must be left in the trigger
  // for the next call.

  const bool web_contents_is_visible =
      page_visibility == PageVisibilityState::kVisible;

  if (host_->is_hidden()) {
    // If the WebContents is becoming visible, ask the compositor to report the
    // visibility time for metrics. Otherwise the widget is being rendered even
    // though the WebContents is hidden or occluded, for example due to being
    // captured, so it should not be included in visibility time metrics.
    NotifyHostAndDelegateOnWasShown(
        web_contents_is_visible ? visible_time_request_trigger.TakeRequest()
                                : nullptr);
    return;
  }

  // `page_visibility` changed while the widget remains visible (kVisible ->
  // kHiddenButPainting or vice versa). Nothing to do except update the
  // visible time request, if any.
  if (web_contents_is_visible) {
    // The widget is already rendering, but now the WebContents is becoming
    // visible, so send any visibility time request to the compositor now.
    if (auto visible_time_request =
            visible_time_request_trigger.TakeRequest()) {
      RequestSuccessfulPresentationTimeFromHostOrDelegate(
          std::move(visible_time_request));
    }
    return;
  }

  // The widget should keep rendering but the WebContents is no longer
  // visible. If the compositor didn't already report the visibility time,
  // it's too late. (For example, if the WebContents is being captured and
  // was put in the foreground and then quickly hidden again before the
  // compositor submitted a frame. The compositor will keep submitting
  // frames for the capture but they should not be included in the
  // visibility metrics.)
  CancelSuccessfulPresentationTimeRequestForHostAndDelegate();
  return;
}

void RenderWidgetHostViewBase::SetIsFrameSinkIdOwner(bool is_owner) {
  if (is_frame_sink_id_owner_ == is_owner) {
    return;
  }

  is_frame_sink_id_owner_ = is_owner;
  UpdateFrameSinkIdRegistration();
}

void RenderWidgetHostViewBase::UpdateFrameSinkIdRegistration() {
  // If Destroy() has been called before we get here, host_ may be null.
  if (!host() || !host()->delegate() ||
      !host()->delegate()->GetInputEventRouter()) {
    return;
  }

  // Let the page-level input event router know about our frame sink ID
  // for surface-based hit testing.
  auto* router = host()->delegate()->GetInputEventRouter();
  if (is_frame_sink_id_owner_) {
    if (!router->IsViewInMap(this)) {
      router->AddFrameSinkIdOwner(GetFrameSinkId(), this);
    }
  } else if (router->IsViewInMap(this)) {
    // Ensure this view is the owner before removing the associated FrameSinkId
    // from input tracking. Speculative views start as non-owing and will not
    // register until ownership has been transferred.
    router->RemoveFrameSinkIdOwner(GetFrameSinkId());
  }
}

}  // namespace content