/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* 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 "mozilla/layers/RemoteContentController.h"

#include "base/message_loop.h"
#include "base/task.h"
#include "MainThreadUtils.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/layers/APZCTreeManagerParent.h"  // for APZCTreeManagerParent
#include "mozilla/layers/APZThreadUtils.h"
#include "mozilla/layout/RenderFrameParent.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/Unused.h"
#include "Units.h"
#ifdef MOZ_WIDGET_ANDROID
#include "AndroidBridge.h"
#endif

namespace mozilla {
namespace layers {

using namespace mozilla::gfx;

RemoteContentController::RemoteContentController()
  : mCompositorThread(MessageLoop::current())
  , mCanSend(true)
  , mMutex("RemoteContentController")
{
}

RemoteContentController::~RemoteContentController()
{
}

void
RemoteContentController::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
{
  MOZ_ASSERT(IsRepaintThread());

  if (mCanSend) {
    Unused << SendRequestContentRepaint(aFrameMetrics);
  }
}

void
RemoteContentController::HandleTap(TapType aTapType,
                                   const LayoutDevicePoint& aPoint,
                                   Modifiers aModifiers,
                                   const ScrollableLayerGuid& aGuid,
                                   uint64_t aInputBlockId)
{
  APZThreadUtils::AssertOnControllerThread();

  if (XRE_GetProcessType() == GeckoProcessType_GPU) {
    MOZ_ASSERT(MessageLoop::current() == mCompositorThread);

    // The raw pointer to APZCTreeManagerParent is ok here because we are on the
    // compositor thread.
    APZCTreeManagerParent* apzctmp =
        CompositorBridgeParent::GetApzcTreeManagerParentForRoot(aGuid.mLayersId);
    if (apzctmp) {
      Unused << apzctmp->SendHandleTap(aTapType, aPoint, aModifiers, aGuid, aInputBlockId);
      return;
    }
  }

  // If we get here we're probably in the parent process, but we might be in
  // the GPU process in some shutdown phase where the LayerTreeState or
  // APZCTreeManagerParent structures are torn down. In that case we'll just get
  // a null TabParent.
  dom::TabParent* tab = dom::TabParent::GetTabParentFromLayersId(aGuid.mLayersId);
  if (tab) {
    // If we got a TabParent we're definitely in the parent process, and the
    // message is going to a child process. That means we're in an e10s
    // environment, so we must be on the main thread.
    MOZ_ASSERT(XRE_IsParentProcess());
    MOZ_ASSERT(NS_IsMainThread());
    tab->SendHandleTap(aTapType, aPoint, aModifiers, aGuid, aInputBlockId);
  }
}

void
RemoteContentController::PostDelayedTask(already_AddRefed<Runnable> aTask, int aDelayMs)
{
#ifdef MOZ_WIDGET_ANDROID
  AndroidBridge::Bridge()->PostTaskToUiThread(Move(aTask), aDelayMs);
#else
  (MessageLoop::current() ? MessageLoop::current() : mCompositorThread)->
    PostDelayedTask(Move(aTask), aDelayMs);
#endif
}

bool
RemoteContentController::IsRepaintThread()
{
  return MessageLoop::current() == mCompositorThread;
}

void
RemoteContentController::DispatchToRepaintThread(already_AddRefed<Runnable> aTask)
{
  mCompositorThread->PostTask(Move(aTask));
}

bool
RemoteContentController::GetTouchSensitiveRegion(CSSRect* aOutRegion)
{
  MutexAutoLock lock(mMutex);
  if (mTouchSensitiveRegion.IsEmpty()) {
    return false;
  }

  *aOutRegion = CSSRect::FromAppUnits(mTouchSensitiveRegion.GetBounds());
  return true;
}

void
RemoteContentController::NotifyAPZStateChange(const ScrollableLayerGuid& aGuid,
                                              APZStateChange aChange,
                                              int aArg)
{
  if (MessageLoop::current() != mCompositorThread) {
    // We have to send messages from the compositor thread
    mCompositorThread->PostTask(NewRunnableMethod<ScrollableLayerGuid,
                                        APZStateChange,
                                        int>(this,
                                             &RemoteContentController::NotifyAPZStateChange,
                                             aGuid, aChange, aArg));
    return;
  }

  if (mCanSend) {
    Unused << SendNotifyAPZStateChange(aGuid, aChange, aArg);
  }
}

void
RemoteContentController::UpdateOverscrollVelocity(float aX, float aY, bool aIsRootContent)
{
  if (MessageLoop::current() != mCompositorThread) {
    mCompositorThread->PostTask(NewRunnableMethod<float,
                                        float, bool>(this,
                                             &RemoteContentController::UpdateOverscrollVelocity,
                                             aX, aY, aIsRootContent));
    return;
  }
  Unused << SendUpdateOverscrollVelocity(aX, aY, aIsRootContent);
}

void
RemoteContentController::UpdateOverscrollOffset(float aX, float aY, bool aIsRootContent)
{
  if (MessageLoop::current() != mCompositorThread) {
    mCompositorThread->PostTask(NewRunnableMethod<float,
                                        float, bool>(this,
                                             &RemoteContentController::UpdateOverscrollOffset,
                                             aX, aY, aIsRootContent));
    return;
  }
  Unused << SendUpdateOverscrollOffset(aX, aY, aIsRootContent);
}

void
RemoteContentController::SetScrollingRootContent(bool aIsRootContent)
{
  if (MessageLoop::current() != mCompositorThread) {
    mCompositorThread->PostTask(NewRunnableMethod<bool>(this,
                                             &RemoteContentController::SetScrollingRootContent,
                                             aIsRootContent));
    return;
  }
  Unused << SendSetScrollingRootContent(aIsRootContent);
}

void
RemoteContentController::NotifyMozMouseScrollEvent(const FrameMetrics::ViewID& aScrollId,
                                                   const nsString& aEvent)
{
  if (MessageLoop::current() != mCompositorThread) {
    // We have to send messages from the compositor thread
    mCompositorThread->PostTask(NewRunnableMethod<FrameMetrics::ViewID,
                                        nsString>(this,
                                                  &RemoteContentController::NotifyMozMouseScrollEvent,
                                                  aScrollId, aEvent));
    return;
  }

  if (mCanSend) {
    Unused << SendNotifyMozMouseScrollEvent(aScrollId, aEvent);
  }
}

void
RemoteContentController::NotifyFlushComplete()
{
  MOZ_ASSERT(IsRepaintThread());

  if (mCanSend) {
    Unused << SendNotifyFlushComplete();
  }
}

bool
RemoteContentController::RecvUpdateHitRegion(const nsRegion& aRegion)
{
  MutexAutoLock lock(mMutex);
  mTouchSensitiveRegion = aRegion;
  return true;
}

void
RemoteContentController::ActorDestroy(ActorDestroyReason aWhy)
{
  // This controller could possibly be kept alive longer after this
  // by a RefPtr, but it is no longer valid to send messages.
  mCanSend = false;
}

void
RemoteContentController::Destroy()
{
  if (mCanSend) {
    Unused << SendDestroy();
  }
}

} // namespace layers
} // namespace mozilla