Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#ifndef MOZILLA_LAYERS_COMPOSITABLEFORWARDER
#define MOZILLA_LAYERS_COMPOSITABLEFORWARDER
#include <stdint.h> // for int32_t, uint32_t, uint64_t
#include "mozilla/Assertions.h" // for AssertionConditionType, MOZ_ASSERT, MOZ_ASSERT_HELPER1
#include "mozilla/Atomics.h"
#include "mozilla/RefPtr.h" // for RefPtr
#include "mozilla/TimeStamp.h" // for TimeStamp
#include "mozilla/ipc/ProtocolUtils.h" // for IToplevelProtocol, ProtocolID
#include "mozilla/layers/KnowsCompositor.h" // for KnowsCompositor
#include "nsRect.h" // for nsIntRect
#include "nsRegion.h" // for nsIntRegion
#include "nsTArray.h" // for nsTArray
namespace mozilla {
namespace layers {
class CompositableClient;
class CompositableHandle;
class ImageContainer;
class PTextureChild;
class SurfaceDescriptorTiles;
class TextureClient;
/**
* FwdTransactionCounter issues forwarder transaction numbers that represent a
* sequential stream of transactions to be transported over IPDL. Since every
* top-level protocol represents its own independently-sequenced IPDL queue,
* transaction numbers most naturally align with top-level protocols, rather
* than have different sub-protocols with their own independent transaction
* numbers that can't be usefully sequenced. FwdTransactionCounter expects
* users of it to provide themselves as proof they are a top-level protocol
* to avoid issues.
*/
struct FwdTransactionCounter {
explicit FwdTransactionCounter(mozilla::ipc::IToplevelProtocol* aToplevel)
: mFwdTransactionType(aToplevel->GetProtocolId()) {}
/**
* The ID of the top-level protocol. This is useful to tag the source of
* the transaction numbers in case different sources must be disambiguated.
*/
mozilla::ipc::ProtocolId mFwdTransactionType;
/**
* Transaction id of ShadowLayerForwarder.
* It is incremented by UpdateFwdTransactionId() in each BeginTransaction()
* call.
*/
uint64_t mFwdTransactionId = 0;
};
/**
* FwdTransactionTracker is to be used by CompositableForwarder consumers that
* must remember the last transaction in which they were used.
*/
class FwdTransactionTracker {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FwdTransactionTracker)
static already_AddRefed<FwdTransactionTracker> GetOrCreate(
RefPtr<FwdTransactionTracker>& aTracker) {
if (!aTracker) {
aTracker = new FwdTransactionTracker;
}
return do_AddRef(aTracker);
}
bool IsUsed() const { return mFwdTransactionType && mFwdTransactionId; }
void Use(const FwdTransactionCounter& aCounter) {
mFwdTransactionType = aCounter.mFwdTransactionType;
mFwdTransactionId = aCounter.mFwdTransactionId;
}
Atomic<mozilla::ipc::ProtocolId> mFwdTransactionType{
(mozilla::ipc::ProtocolId)0};
Atomic<uint64_t> mFwdTransactionId{0};
private:
FwdTransactionTracker() = default;
~FwdTransactionTracker() = default;
};
inline RemoteTextureTxnType ToRemoteTextureTxnType(
const RefPtr<FwdTransactionTracker>& aTracker) {
return aTracker ? (RemoteTextureTxnType)aTracker->mFwdTransactionType : 0;
}
inline RemoteTextureTxnId ToRemoteTextureTxnId(
const RefPtr<FwdTransactionTracker>& aTracker) {
return aTracker ? (RemoteTextureTxnId)aTracker->mFwdTransactionId : 0;
}
/**
* A transaction is a set of changes that happenned on the content side, that
* should be sent to the compositor side.
* CompositableForwarder is an interface to manage a transaction of
* compositable objetcs.
*
* ShadowLayerForwarder is an example of a CompositableForwarder (that can
* additionally forward modifications of the Layer tree).
* ImageBridgeChild is another CompositableForwarder.
*
* CompositableForwarder implements KnowsCompositor for simplicity as all
* implementations of CompositableForwarder currently also implement
* KnowsCompositor. This dependency could be split if we add new use cases.
*/
class CompositableForwarder : public KnowsCompositor {
public:
CompositableForwarder();
~CompositableForwarder();
/**
* Setup the IPDL actor for aCompositable to be part of layers
* transactions.
*/
virtual void Connect(CompositableClient* aCompositable,
ImageContainer* aImageContainer = nullptr) = 0;
virtual void ReleaseCompositable(const CompositableHandle& aHandle) = 0;
virtual bool DestroyInTransaction(PTextureChild* aTexture) = 0;
/**
* Tell the CompositableHost on the compositor side to remove the texture
* from the CompositableHost.
* This function does not delete the TextureHost corresponding to the
* TextureClient passed in parameter.
* When the TextureClient has TEXTURE_DEALLOCATE_CLIENT flag,
* the transaction becomes synchronous.
*/
virtual void RemoveTextureFromCompositable(CompositableClient* aCompositable,
TextureClient* aTexture) = 0;
struct TimedTextureClient {
TimedTextureClient()
: mTextureClient(nullptr), mFrameID(0), mProducerID(0) {}
TextureClient* mTextureClient;
TimeStamp mTimeStamp;
nsIntRect mPictureRect;
int32_t mFrameID;
int32_t mProducerID;
};
/**
* Tell the CompositableHost on the compositor side what textures to use for
* the next composition.
*/
virtual void UseTextures(CompositableClient* aCompositable,
const nsTArray<TimedTextureClient>& aTextures) = 0;
virtual void UseRemoteTexture(
CompositableClient* aCompositable, const RemoteTextureId aTextureId,
const RemoteTextureOwnerId aOwnerId, const gfx::IntSize aSize,
const TextureFlags aFlags,
const RefPtr<layers::FwdTransactionTracker>& aTracker) = 0;
void UpdateFwdTransactionId() {
++GetFwdTransactionCounter().mFwdTransactionId;
}
uint64_t GetFwdTransactionId() {
return GetFwdTransactionCounter().mFwdTransactionId;
}
mozilla::ipc::ProtocolId GetFwdTransactionType() {
return GetFwdTransactionCounter().mFwdTransactionType;
}
virtual bool InForwarderThread() = 0;
void AssertInForwarderThread() { MOZ_ASSERT(InForwarderThread()); }
protected:
virtual FwdTransactionCounter& GetFwdTransactionCounter() = 0;
void TrackFwdTransaction(const RefPtr<FwdTransactionTracker>& aTracker) {
if (aTracker) {
aTracker->Use(GetFwdTransactionCounter());
}
}
nsTArray<RefPtr<TextureClient>> mTexturesToRemove;
nsTArray<RefPtr<CompositableClient>> mCompositableClientsToRemove;
};
} // namespace layers
} // namespace mozilla
#endif