/* -*- 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/CompositorManagerChild.h"

#include "mozilla/StaticPrefs_layers.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/CompositorManagerParent.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/dom/ContentChild.h"  // for ContentChild
#include "mozilla/dom/BrowserChild.h"  // for BrowserChild
#include "mozilla/ipc/Endpoint.h"
#include "VsyncSource.h"

namespace mozilla {
namespace layers {

using gfx::GPUProcessManager;

StaticRefPtr<CompositorManagerChild> CompositorManagerChild::sInstance;
Atomic<base::ProcessId> CompositorManagerChild::sOtherPid(0);

/* static */
bool CompositorManagerChild::IsInitialized(uint64_t aProcessToken) {
  MOZ_ASSERT(NS_IsMainThread());
  return sInstance && sInstance->CanSend() &&
         sInstance->mProcessToken == aProcessToken;
}

/* static */
void CompositorManagerChild::InitSameProcess(uint32_t aNamespace,
                                             uint64_t aProcessToken) {
  MOZ_ASSERT(NS_IsMainThread());
  if (NS_WARN_IF(IsInitialized(aProcessToken))) {
    MOZ_ASSERT_UNREACHABLE("Already initialized same process");
    return;
  }

  RefPtr<CompositorManagerParent> parent =
      CompositorManagerParent::CreateSameProcess();
  RefPtr<CompositorManagerChild> child =
      new CompositorManagerChild(parent, aProcessToken, aNamespace);
  if (NS_WARN_IF(!child->CanSend())) {
    MOZ_DIAGNOSTIC_ASSERT(false, "Failed to open same process protocol");
    return;
  }

  parent->BindComplete(/* aIsRoot */ true);
  sInstance = std::move(child);
  sOtherPid = sInstance->OtherPid();
}

/* static */
bool CompositorManagerChild::Init(Endpoint<PCompositorManagerChild>&& aEndpoint,
                                  uint32_t aNamespace,
                                  uint64_t aProcessToken /* = 0 */) {
  MOZ_ASSERT(NS_IsMainThread());
  if (sInstance) {
    MOZ_ASSERT(sInstance->mNamespace != aNamespace);
  }

  sInstance = new CompositorManagerChild(std::move(aEndpoint), aProcessToken,
                                         aNamespace);
  sOtherPid = sInstance->OtherPid();
  return sInstance->CanSend();
}

/* static */
void CompositorManagerChild::Shutdown() {
  MOZ_ASSERT(NS_IsMainThread());
  CompositorBridgeChild::ShutDown();

  if (!sInstance) {
    return;
  }

  sInstance->Close();
  sInstance = nullptr;
  sOtherPid = 0;
}

/* static */
void CompositorManagerChild::OnGPUProcessLost(uint64_t aProcessToken) {
  MOZ_ASSERT(NS_IsMainThread());

  // Since GPUChild and CompositorManagerChild will race on ActorDestroy, we
  // cannot know if the CompositorManagerChild is about to be released but has
  // yet to be. As such, we want to pre-emptively set mCanSend to false.
  if (sInstance && sInstance->mProcessToken == aProcessToken) {
    sInstance->mCanSend = false;
    sOtherPid = 0;
  }
}

/* static */
bool CompositorManagerChild::CreateContentCompositorBridge(
    uint32_t aNamespace) {
  MOZ_ASSERT(NS_IsMainThread());
  if (NS_WARN_IF(!sInstance || !sInstance->CanSend())) {
    return false;
  }

  CompositorBridgeOptions options = ContentCompositorOptions();

  RefPtr<CompositorBridgeChild> bridge = new CompositorBridgeChild(sInstance);
  if (NS_WARN_IF(
          !sInstance->SendPCompositorBridgeConstructor(bridge, options))) {
    return false;
  }

  bridge->InitForContent(aNamespace);
  return true;
}

/* static */
already_AddRefed<CompositorBridgeChild>
CompositorManagerChild::CreateWidgetCompositorBridge(
    uint64_t aProcessToken, WebRenderLayerManager* aLayerManager,
    uint32_t aNamespace, CSSToLayoutDeviceScale aScale,
    const CompositorOptions& aOptions, bool aUseExternalSurfaceSize,
    const gfx::IntSize& aSurfaceSize, uint64_t aInnerWindowId) {
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
  if (NS_WARN_IF(!sInstance || !sInstance->CanSend())) {
    return nullptr;
  }

  TimeDuration vsyncRate =
      gfxPlatform::GetPlatform()->GetGlobalVsyncDispatcher()->GetVsyncRate();

  CompositorBridgeOptions options = WidgetCompositorOptions(
      aScale, vsyncRate, aOptions, aUseExternalSurfaceSize, aSurfaceSize,
      aInnerWindowId);

  RefPtr<CompositorBridgeChild> bridge = new CompositorBridgeChild(sInstance);
  if (NS_WARN_IF(
          !sInstance->SendPCompositorBridgeConstructor(bridge, options))) {
    return nullptr;
  }

  bridge->InitForWidget(aProcessToken, aLayerManager, aNamespace);
  return bridge.forget();
}

/* static */
already_AddRefed<CompositorBridgeChild>
CompositorManagerChild::CreateSameProcessWidgetCompositorBridge(
    WebRenderLayerManager* aLayerManager, uint32_t aNamespace) {
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
  if (NS_WARN_IF(!sInstance || !sInstance->CanSend())) {
    return nullptr;
  }

  CompositorBridgeOptions options = SameProcessWidgetCompositorOptions();

  RefPtr<CompositorBridgeChild> bridge = new CompositorBridgeChild(sInstance);
  if (NS_WARN_IF(
          !sInstance->SendPCompositorBridgeConstructor(bridge, options))) {
    return nullptr;
  }

  bridge->InitForWidget(1, aLayerManager, aNamespace);
  return bridge.forget();
}

CompositorManagerChild::CompositorManagerChild(CompositorManagerParent* aParent,
                                               uint64_t aProcessToken,
                                               uint32_t aNamespace)
    : mProcessToken(aProcessToken),
      mNamespace(aNamespace),
      mResourceId(0),
      mCanSend(false),
      mSameProcess(true) {
  MOZ_ASSERT(aParent);

  SetOtherProcessId(base::GetCurrentProcId());
  if (NS_WARN_IF(!Open(aParent, CompositorThread(), ipc::ChildSide))) {
    return;
  }

  mCanSend = true;
  AddRef();
  SetReplyTimeout();
}

CompositorManagerChild::CompositorManagerChild(
    Endpoint<PCompositorManagerChild>&& aEndpoint, uint64_t aProcessToken,
    uint32_t aNamespace)
    : mProcessToken(aProcessToken),
      mNamespace(aNamespace),
      mResourceId(0),
      mCanSend(false),
      mSameProcess(false) {
  if (NS_WARN_IF(!aEndpoint.Bind(this))) {
    return;
  }

  mCanSend = true;
  AddRef();
  SetReplyTimeout();
}

void CompositorManagerChild::ActorDealloc() {
  MOZ_ASSERT(!mCanSend);
  Release();
}

void CompositorManagerChild::ActorDestroy(ActorDestroyReason aReason) {
  mCanSend = false;
  if (sInstance == this) {
    sInstance = nullptr;
  }
}

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

void CompositorManagerChild::ProcessingError(Result aCode,
                                             const char* aReason) {
  if (aCode != MsgDropped) {
    gfxDevCrash(gfx::LogReason::ProcessingError)
        << "Processing error in CompositorBridgeChild: " << int(aCode);
  }
}

void CompositorManagerChild::SetReplyTimeout() {
#ifndef DEBUG
  // Add a timeout for release builds to kill GPU process when it hangs.
  if (XRE_IsParentProcess() && GPUProcessManager::Get()->GetGPUChild()) {
    int32_t timeout =
        StaticPrefs::layers_gpu_process_ipc_reply_timeout_ms_AtStartup();
    SetReplyTimeoutMs(timeout);
  }
#endif
}

bool CompositorManagerChild::ShouldContinueFromReplyTimeout() {
  if (XRE_IsParentProcess()) {
    gfxCriticalNote << "Killing GPU process due to IPC reply timeout";
    MOZ_DIAGNOSTIC_ASSERT(GPUProcessManager::Get()->GetGPUChild());
    GPUProcessManager::Get()->KillProcess();
  }
  return false;
}

mozilla::ipc::IPCResult CompositorManagerChild::RecvNotifyWebRenderError(
    const WebRenderError&& aError) {
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
  GPUProcessManager::Get()->NotifyWebRenderError(aError);
  return IPC_OK();
}

}  // namespace layers
}  // namespace mozilla