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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 */
#include <stddef.h> // for size_t
#include <stdint.h> // for uint32_t, uint64_t
#include "mozilla/Atomics.h"
#include "mozilla/Attributes.h" // for override
#include "mozilla/RefPtr.h" // for already_AddRefed
#include "mozilla/StaticPtr.h" // for StaticRefPtr
#include "mozilla/layers/CompositableForwarder.h" // for FwdTransactionCounter
#include "mozilla/layers/PCompositorManagerChild.h"
namespace mozilla {
namespace layers {
class CompositorBridgeChild;
class CompositorManagerParent;
class WebRenderLayerManager;
class CompositorManagerChild : public PCompositorManagerChild {
static bool IsInitialized(uint64_t aProcessToken);
static void InitSameProcess(uint32_t aNamespace, uint64_t aProcessToken);
static bool Init(Endpoint<PCompositorManagerChild>&& aEndpoint,
uint32_t aNamespace, uint64_t aProcessToken = 0);
static void Shutdown();
static void OnGPUProcessLost(uint64_t aProcessToken);
static bool CreateContentCompositorBridge(uint32_t aNamespace);
static already_AddRefed<CompositorBridgeChild> CreateWidgetCompositorBridge(
uint64_t aProcessToken, WebRenderLayerManager* aLayerManager,
uint32_t aNamespace, CSSToLayoutDeviceScale aScale,
const CompositorOptions& aOptions, bool aUseExternalSurfaceSize,
const gfx::IntSize& aSurfaceSize, uint64_t aInnerWindowId);
static already_AddRefed<CompositorBridgeChild>
CreateSameProcessWidgetCompositorBridge(WebRenderLayerManager* aLayerManager,
uint32_t aNamespace);
static CompositorManagerChild* GetInstance() {
return sInstance;
// Threadsafe way to get the compositor process ID.
static base::ProcessId GetOtherPid() { return sOtherPid; }
bool CanSend() const {
return mCanSend;
bool SameProcess() const {
return mSameProcess;
uint32_t GetNextResourceId() {
return ++mResourceId;
uint32_t GetNamespace() const { return mNamespace; }
bool OwnsExternalImageId(const wr::ExternalImageId& aId) const {
return mNamespace == static_cast<uint32_t>(wr::AsUint64(aId) >> 32);
wr::ExternalImageId GetNextExternalImageId() {
uint64_t id = GetNextResourceId();
id |= (static_cast<uint64_t>(mNamespace) << 32);
return wr::ToExternalImageId(id);
void ActorDestroy(ActorDestroyReason aReason) override;
void HandleFatalError(const char* aMsg) override;
void ProcessingError(Result aCode, const char* aReason) override;
bool ShouldContinueFromReplyTimeout() override;
mozilla::ipc::IPCResult RecvNotifyWebRenderError(
const WebRenderError&& aError);
FwdTransactionCounter& GetFwdTransactionCounter() {
return mFwdTransactionCounter;
static StaticRefPtr<CompositorManagerChild> sInstance;
static Atomic<base::ProcessId> sOtherPid;
CompositorManagerChild(CompositorManagerParent* aParent,
uint64_t aProcessToken, uint32_t aNamespace);
CompositorManagerChild(Endpoint<PCompositorManagerChild>&& aEndpoint,
uint64_t aProcessToken, uint32_t aNamespace);
virtual ~CompositorManagerChild() = default;
void SetReplyTimeout();
uint64_t mProcessToken;
uint32_t mNamespace;
uint32_t mResourceId;
bool mCanSend;
bool mSameProcess;
FwdTransactionCounter mFwdTransactionCounter;
} // namespace layers
} // namespace mozilla