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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/layers/UiCompositorControllerChild.h"

#include "mozilla/dom/ContentChild.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/layers/UiCompositorControllerMessageTypes.h"
#include "mozilla/layers/UiCompositorControllerParent.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/StaticPtr.h"
#include "nsBaseWidget.h"
#include "nsThreadUtils.h"

#if defined(MOZ_WIDGET_ANDROID)
#include "mozilla/widget/AndroidUiThread.h"

static RefPtr<nsThread>
GetUiThread()
{
  return mozilla::GetAndroidUiThread();
}
#else
static RefPtr<nsThread>
GetUiThread()
{
  MOZ_CRASH("Platform does not support UiCompositorController");
  return nullptr;
}
#endif // defined(MOZ_WIDGET_ANDROID)

static bool
IsOnUiThread()
{
  return GetUiThread()->SerialEventTarget()->IsOnCurrentThread();
}

namespace mozilla {
namespace layers {


// public:
/* static */ RefPtr<UiCompositorControllerChild>
UiCompositorControllerChild::CreateForSameProcess(const LayersId& aRootLayerTreeId)
{
  RefPtr<UiCompositorControllerChild> child = new UiCompositorControllerChild(0);
  child->mParent = new UiCompositorControllerParent(aRootLayerTreeId);
  GetUiThread()->Dispatch(
    NewRunnableMethod("layers::UiCompositorControllerChild::OpenForSameProcess",
                      child,
                      &UiCompositorControllerChild::OpenForSameProcess),
    nsIThread::DISPATCH_NORMAL);
  return child;
}

/* static */ RefPtr<UiCompositorControllerChild>
UiCompositorControllerChild::CreateForGPUProcess(const uint64_t& aProcessToken,
                                                 Endpoint<PUiCompositorControllerChild>&& aEndpoint)
{
  RefPtr<UiCompositorControllerChild> child = new UiCompositorControllerChild(aProcessToken);

  RefPtr<nsIRunnable> task =
    NewRunnableMethod<Endpoint<PUiCompositorControllerChild>&&>(
      "layers::UiCompositorControllerChild::OpenForGPUProcess",
      child,
      &UiCompositorControllerChild::OpenForGPUProcess,
      std::move(aEndpoint));

  GetUiThread()->Dispatch(task.forget(), nsIThread::DISPATCH_NORMAL);
  return child;
}

bool
UiCompositorControllerChild::Pause()
{
  if (!mIsOpen) {
    return false;
  }
  return SendPause();
}

bool
UiCompositorControllerChild::Resume()
{
  if (!mIsOpen) {
    return false;
  }
  return SendResume();
}

bool
UiCompositorControllerChild::ResumeAndResize(const int32_t& aWidth, const int32_t& aHeight)
{
  if (!mIsOpen) {
    mResize = Some(gfx::IntSize(aWidth, aHeight));
    // Since we are caching these values, pretend the call succeeded.
    return true;
  }
  return SendResumeAndResize(aWidth, aHeight);
}

bool
UiCompositorControllerChild::InvalidateAndRender()
{
  if (!mIsOpen) {
    return false;
  }
  return SendInvalidateAndRender();
}

bool
UiCompositorControllerChild::SetMaxToolbarHeight(const int32_t& aHeight)
{
  if (!mIsOpen) {
    mMaxToolbarHeight = Some(aHeight);
    // Since we are caching this value, pretend the call succeeded.
    return true;
  }
  return SendMaxToolbarHeight(aHeight);
}

bool
UiCompositorControllerChild::SetPinned(const bool& aPinned, const int32_t& aReason)
{
  if (!mIsOpen) {
    return false;
  }
  return SendPinned(aPinned, aReason);
}

bool
UiCompositorControllerChild::ToolbarAnimatorMessageFromUI(const int32_t& aMessage)
{
  if (!mIsOpen) {
    return false;
  }

  if (aMessage == IS_COMPOSITOR_CONTROLLER_OPEN) {
    RecvToolbarAnimatorMessageFromCompositor(COMPOSITOR_CONTROLLER_OPEN);
    return true;
  }

  return SendToolbarAnimatorMessageFromUI(aMessage);
}

bool
UiCompositorControllerChild::SetDefaultClearColor(const uint32_t& aColor)
{
  if (!mIsOpen) {
    mDefaultClearColor = Some(aColor);
    // Since we are caching this value, pretend the call succeeded.
    return true;
  }

  return SendDefaultClearColor(aColor);
}

bool
UiCompositorControllerChild::RequestScreenPixels()
{
  if (!mIsOpen) {
    return false;
  }

  return SendRequestScreenPixels();
}

bool
UiCompositorControllerChild::EnableLayerUpdateNotifications(const bool& aEnable)
{
  if (!mIsOpen) {
    mLayerUpdateEnabled = Some(aEnable);
    // Since we are caching this value, pretend the call succeeded.
    return true;
  }

  return SendEnableLayerUpdateNotifications(aEnable);
}

bool
UiCompositorControllerChild::ToolbarPixelsToCompositor(Shmem& aMem, const ScreenIntSize& aSize)
{
  if (!mIsOpen) {
    return false;
  }

  return SendToolbarPixelsToCompositor(aMem, aSize);
}

void
UiCompositorControllerChild::Destroy()
{
  if (!IsOnUiThread()) {
    GetUiThread()->Dispatch(
      NewRunnableMethod("layers::UiCompositorControllerChild::Destroy",
                        this,
                        &UiCompositorControllerChild::Destroy),
      nsIThread::DISPATCH_SYNC);
    return;
  }

  if (mIsOpen) {
    // Close the underlying IPC channel.
    PUiCompositorControllerChild::Close();
    mIsOpen = false;
  }
}

void
UiCompositorControllerChild::SetBaseWidget(nsBaseWidget* aWidget)
{
  mWidget = aWidget;
}

bool
UiCompositorControllerChild::AllocPixelBuffer(const int32_t aSize, Shmem* aMem)
{
  MOZ_ASSERT(aSize > 0);
  return AllocShmem(aSize, ipc::SharedMemory::TYPE_BASIC, aMem);
}

bool
UiCompositorControllerChild::DeallocPixelBuffer(Shmem& aMem)
{
  return DeallocShmem(aMem);
}

// protected:
void
UiCompositorControllerChild::ActorDestroy(ActorDestroyReason aWhy)
{
  mIsOpen = false;
  mParent = nullptr;

  if (mProcessToken) {
    gfx::GPUProcessManager::Get()->NotifyRemoteActorDestroyed(mProcessToken);
    mProcessToken = 0;
  }
}

void
UiCompositorControllerChild::DeallocPUiCompositorControllerChild()
{
  if (mParent) {
    mParent = nullptr;
  }
  Release();
}

void
UiCompositorControllerChild::ProcessingError(Result aCode, const char* aReason)
{
  MOZ_RELEASE_ASSERT(aCode == MsgDropped, "Processing error in UiCompositorControllerChild");
}

void
UiCompositorControllerChild::HandleFatalError(const char* aMsg) const
{
  dom::ContentChild::FatalErrorIfNotUsingGPUProcess(aMsg, OtherPid());
}

mozilla::ipc::IPCResult
UiCompositorControllerChild::RecvToolbarAnimatorMessageFromCompositor(const int32_t& aMessage)
{
#if defined(MOZ_WIDGET_ANDROID)
  if (mWidget) {
    mWidget->RecvToolbarAnimatorMessageFromCompositor(aMessage);
  }
#endif // defined(MOZ_WIDGET_ANDROID)

  return IPC_OK();
}

mozilla::ipc::IPCResult
UiCompositorControllerChild::RecvRootFrameMetrics(const ScreenPoint& aScrollOffset, const CSSToScreenScale& aZoom)
{
#if defined(MOZ_WIDGET_ANDROID)
  if (mWidget) {
    mWidget->UpdateRootFrameMetrics(aScrollOffset, aZoom);
  }
#endif // defined(MOZ_WIDGET_ANDROID)

  return IPC_OK();
}

mozilla::ipc::IPCResult
UiCompositorControllerChild::RecvScreenPixels(ipc::Shmem&& aMem, const ScreenIntSize& aSize)
{
#if defined(MOZ_WIDGET_ANDROID)
  if (mWidget) {
    mWidget->RecvScreenPixels(std::move(aMem), aSize);
  }
#endif // defined(MOZ_WIDGET_ANDROID)

  return IPC_OK();
}

// private:
UiCompositorControllerChild::UiCompositorControllerChild(const uint64_t& aProcessToken)
 : mIsOpen(false)
 , mProcessToken(aProcessToken)
 , mWidget(nullptr)
{
}

UiCompositorControllerChild::~UiCompositorControllerChild()
{
}

void
UiCompositorControllerChild::OpenForSameProcess()
{
  MOZ_ASSERT(IsOnUiThread());

  mIsOpen = Open(mParent->GetIPCChannel(),
                 mozilla::layers::CompositorThreadHolder::Loop(),
                 mozilla::ipc::ChildSide);

  if (!mIsOpen) {
    mParent = nullptr;
    return;
  }

  mParent->InitializeForSameProcess();
  AddRef();
  SendCachedValues();
  // Let Ui thread know the connection is open;
  RecvToolbarAnimatorMessageFromCompositor(COMPOSITOR_CONTROLLER_OPEN);
}

void
UiCompositorControllerChild::OpenForGPUProcess(Endpoint<PUiCompositorControllerChild>&& aEndpoint)
{
  MOZ_ASSERT(IsOnUiThread());

  mIsOpen = aEndpoint.Bind(this);

  if (!mIsOpen) {
    // The GPU Process Manager might be gone if we receive ActorDestroy very
    // late in shutdown.
    if (gfx::GPUProcessManager* gpm = gfx::GPUProcessManager::Get()) {
      gpm->NotifyRemoteActorDestroyed(mProcessToken);
    }
    return;
  }

  AddRef();
  SendCachedValues();
  // Let Ui thread know the connection is open;
  RecvToolbarAnimatorMessageFromCompositor(COMPOSITOR_CONTROLLER_OPEN);
}

void
UiCompositorControllerChild::SendCachedValues()
{
  MOZ_ASSERT(mIsOpen);
  if (mResize) {
    SendResumeAndResize(mResize.ref().width, mResize.ref().height);
    mResize.reset();
  }
  if (mMaxToolbarHeight) {
    SendMaxToolbarHeight(mMaxToolbarHeight.ref());
    mMaxToolbarHeight.reset();
  }
  if (mDefaultClearColor) {
    SendDefaultClearColor(mDefaultClearColor.ref());
    mDefaultClearColor.reset();
  }
  if (mLayerUpdateEnabled) {
    SendEnableLayerUpdateNotifications(mLayerUpdateEnabled.ref());
    mLayerUpdateEnabled.reset();
  }
}

} // namespace layers
} // namespace mozilla