зеркало из https://github.com/mozilla/gecko-dev.git
491 строка
18 KiB
C++
491 строка
18 KiB
C++
/* -*- 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/. */
|
|
|
|
#ifndef mozilla_layers_ShadowLayers_h
|
|
#define mozilla_layers_ShadowLayers_h 1
|
|
|
|
#include <stddef.h> // for size_t
|
|
#include <stdint.h> // for uint64_t
|
|
#include "gfxTypes.h"
|
|
#include "mozilla/Attributes.h" // for override
|
|
#include "mozilla/gfx/Rect.h"
|
|
#include "mozilla/WidgetUtils.h" // for ScreenRotation
|
|
#include "mozilla/dom/ScreenOrientation.h" // for ScreenOrientation
|
|
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
|
|
#include "mozilla/layers/CompositableForwarder.h"
|
|
#include "mozilla/layers/CompositorTypes.h" // for OpenMode, etc
|
|
#include "nsCOMPtr.h" // for already_AddRefed
|
|
#include "nsRegion.h" // for nsIntRegion
|
|
#include "nsTArrayForwardDeclare.h" // for InfallibleTArray
|
|
#include "nsIWidget.h"
|
|
#include <vector>
|
|
|
|
namespace mozilla {
|
|
namespace layers {
|
|
|
|
class EditReply;
|
|
class FixedSizeSmallShmemSectionAllocator;
|
|
class ImageContainer;
|
|
class Layer;
|
|
class PLayerChild;
|
|
class PLayerTransactionChild;
|
|
class LayerTransactionChild;
|
|
class ShadowableLayer;
|
|
class SurfaceDescriptor;
|
|
class TextureClient;
|
|
class ThebesBuffer;
|
|
class ThebesBufferData;
|
|
class Transaction;
|
|
|
|
/**
|
|
* We want to share layer trees across thread contexts and address
|
|
* spaces for several reasons; chief among them
|
|
*
|
|
* - a parent process can paint a child process's layer tree while
|
|
* the child process is blocked, say on content script. This is
|
|
* important on mobile devices where UI responsiveness is key.
|
|
*
|
|
* - a dedicated "compositor" process can asynchronously (wrt the
|
|
* browser process) composite and animate layer trees, allowing a
|
|
* form of pipeline parallelism between compositor/browser/content
|
|
*
|
|
* - a dedicated "compositor" process can take all responsibility for
|
|
* accessing the GPU, which is desirable on systems with
|
|
* buggy/leaky drivers because the compositor process can die while
|
|
* browser and content live on (and failover mechanisms can be
|
|
* installed to quickly bring up a replacement compositor)
|
|
*
|
|
* The Layers model has a crisply defined API, which makes it easy to
|
|
* safely "share" layer trees. The ShadowLayers API extends Layers to
|
|
* allow a remote, parent process to access a child process's layer
|
|
* tree.
|
|
*
|
|
* ShadowLayerForwarder publishes a child context's layer tree to a
|
|
* parent context. This comprises recording layer-tree modifications
|
|
* into atomic transactions and pushing them over IPC.
|
|
*
|
|
* LayerManagerComposite grafts layer subtrees published by child-context
|
|
* ShadowLayerForwarder(s) into a parent-context layer tree.
|
|
*
|
|
* (Advanced note: because our process tree may have a height >2, a
|
|
* non-leaf subprocess may both receive updates from child processes
|
|
* and publish them to parent processes. Put another way,
|
|
* LayerManagers may be both LayerManagerComposites and
|
|
* ShadowLayerForwarders.)
|
|
*
|
|
* There are only shadow types for layers that have different shadow
|
|
* vs. not-shadow behavior. ColorLayers and ContainerLayers behave
|
|
* the same way in both regimes (so far).
|
|
*
|
|
*
|
|
* The mecanism to shadow the layer tree on the compositor through IPC works as
|
|
* follows:
|
|
* The layer tree is managed on the content thread, and shadowed in the compositor
|
|
* thread. The shadow layer tree is only kept in sync with whatever happens in
|
|
* the content thread. To do this we use IPDL protocols. IPDL is a domain
|
|
* specific language that describes how two processes or thread should
|
|
* communicate. C++ code is generated from .ipdl files to implement the message
|
|
* passing, synchronization and serialization logic. To use the generated code
|
|
* we implement classes that inherit the generated IPDL actor. the ipdl actors
|
|
* of a protocol PX are PXChild or PXParent (the generated class), and we
|
|
* conventionally implement XChild and XParent. The Parent side of the protocol
|
|
* is the one that lives on the compositor thread. Think of IPDL actors as
|
|
* endpoints of communication. they are useful to send messages and also to
|
|
* dispatch the message to the right actor on the other side. One nice property
|
|
* of an IPDL actor is that when an actor, say PXChild is sent in a message, the
|
|
* PXParent comes out in the other side. we use this property a lot to dispatch
|
|
* messages to the right layers and compositable, each of which have their own
|
|
* ipdl actor on both side.
|
|
*
|
|
* Most of the synchronization logic happens in layer transactions and
|
|
* compositable transactions.
|
|
* A transaction is a set of changes to the layers and/or the compositables
|
|
* that are sent and applied together to the compositor thread to keep the
|
|
* LayerComposite in a coherent state.
|
|
* Layer transactions maintain the shape of the shadow layer tree, and
|
|
* synchronize the texture data held by compositables. Layer transactions
|
|
* are always between the content thread and the compositor thread.
|
|
* Compositable transactions are subset of a layer transaction with which only
|
|
* compositables and textures can be manipulated, and does not always originate
|
|
* from the content thread. (See CompositableForwarder.h and ImageBridgeChild.h)
|
|
*/
|
|
|
|
class ShadowLayerForwarder final : public CompositableForwarder
|
|
, public ShmemAllocator
|
|
, public LegacySurfaceDescriptorAllocator
|
|
{
|
|
friend class ClientLayerManager;
|
|
|
|
public:
|
|
virtual ~ShadowLayerForwarder();
|
|
|
|
virtual ShmemAllocator* AsShmemAllocator() override { return this; }
|
|
|
|
virtual ShadowLayerForwarder* AsLayerForwarder() override { return this; }
|
|
|
|
virtual LegacySurfaceDescriptorAllocator*
|
|
AsLegacySurfaceDescriptorAllocator() override { return this; }
|
|
|
|
FixedSizeSmallShmemSectionAllocator* GetTileLockAllocator();
|
|
|
|
/**
|
|
* Setup the IPDL actor for aCompositable to be part of layers
|
|
* transactions.
|
|
*/
|
|
virtual void Connect(CompositableClient* aCompositable,
|
|
ImageContainer* aImageContainer) override;
|
|
|
|
virtual PTextureChild* CreateTexture(const SurfaceDescriptor& aSharedData,
|
|
LayersBackend aLayersBackend,
|
|
TextureFlags aFlags) override;
|
|
|
|
/**
|
|
* Adds an edit in the layers transaction in order to attach
|
|
* the corresponding compositable and layer on the compositor side.
|
|
* Connect must have been called on aCompositable beforehand.
|
|
*/
|
|
void Attach(CompositableClient* aCompositable,
|
|
ShadowableLayer* aLayer);
|
|
|
|
/**
|
|
* Adds an edit in the transaction in order to attach a Compositable that
|
|
* is not managed by this ShadowLayerForwarder (for example, by ImageBridge
|
|
* in the case of async-video).
|
|
* Since the compositable is not managed by this forwarder, we can't use
|
|
* the compositable or it's IPDL actor here, so we use an ID instead, that
|
|
* is matched on the compositor side.
|
|
*/
|
|
void AttachAsyncCompositable(uint64_t aCompositableID,
|
|
ShadowableLayer* aLayer);
|
|
|
|
/**
|
|
* Begin recording a transaction to be forwarded atomically to a
|
|
* LayerManagerComposite.
|
|
*/
|
|
void BeginTransaction(const gfx::IntRect& aTargetBounds,
|
|
ScreenRotation aRotation,
|
|
mozilla::dom::ScreenOrientationInternal aOrientation);
|
|
|
|
/**
|
|
* The following methods may only be called after BeginTransaction()
|
|
* but before EndTransaction(). They mirror the LayerManager
|
|
* interface in Layers.h.
|
|
*/
|
|
|
|
/**
|
|
* Notify the shadow manager that a new, "real" layer has been
|
|
* created, and a corresponding shadow layer should be created in
|
|
* the compositing process.
|
|
*/
|
|
void CreatedPaintedLayer(ShadowableLayer* aThebes);
|
|
void CreatedContainerLayer(ShadowableLayer* aContainer);
|
|
void CreatedImageLayer(ShadowableLayer* aImage);
|
|
void CreatedColorLayer(ShadowableLayer* aColor);
|
|
void CreatedCanvasLayer(ShadowableLayer* aCanvas);
|
|
void CreatedRefLayer(ShadowableLayer* aRef);
|
|
|
|
/**
|
|
* At least one attribute of |aMutant| has changed, and |aMutant|
|
|
* needs to sync to its shadow layer. This initial implementation
|
|
* forwards all attributes when any is mutated.
|
|
*/
|
|
void Mutated(ShadowableLayer* aMutant);
|
|
|
|
void SetRoot(ShadowableLayer* aRoot);
|
|
/**
|
|
* Insert |aChild| after |aAfter| in |aContainer|. |aAfter| can be
|
|
* nullptr to indicated that |aChild| should be appended to the end of
|
|
* |aContainer|'s child list.
|
|
*/
|
|
void InsertAfter(ShadowableLayer* aContainer,
|
|
ShadowableLayer* aChild,
|
|
ShadowableLayer* aAfter = nullptr);
|
|
void RemoveChild(ShadowableLayer* aContainer,
|
|
ShadowableLayer* aChild);
|
|
void RepositionChild(ShadowableLayer* aContainer,
|
|
ShadowableLayer* aChild,
|
|
ShadowableLayer* aAfter = nullptr);
|
|
|
|
/**
|
|
* Set aMaskLayer as the mask on aLayer.
|
|
* Note that only image layers are properly supported
|
|
* LayerTransactionParent::UpdateMask and accompanying ipdl
|
|
* will need changing to update properties for other kinds
|
|
* of mask layer.
|
|
*/
|
|
void SetMask(ShadowableLayer* aLayer,
|
|
ShadowableLayer* aMaskLayer);
|
|
|
|
/**
|
|
* See CompositableForwarder::UseTiledLayerBuffer
|
|
*/
|
|
virtual void UseTiledLayerBuffer(CompositableClient* aCompositable,
|
|
const SurfaceDescriptorTiles& aTileLayerDescriptor) override;
|
|
|
|
virtual bool DestroyInTransaction(PTextureChild* aTexture, bool synchronously) override;
|
|
virtual bool DestroyInTransaction(PCompositableChild* aCompositable, bool synchronously) override;
|
|
|
|
virtual void RemoveTextureFromCompositable(CompositableClient* aCompositable,
|
|
TextureClient* aTexture) override;
|
|
|
|
virtual void RemoveTextureFromCompositableAsync(AsyncTransactionTracker* aAsyncTransactionTracker,
|
|
CompositableClient* aCompositable,
|
|
TextureClient* aTexture) override;
|
|
|
|
/**
|
|
* Communicate to the compositor that aRegion in the texture identified by aLayer
|
|
* and aIdentifier has been updated to aThebesBuffer.
|
|
*/
|
|
virtual void UpdateTextureRegion(CompositableClient* aCompositable,
|
|
const ThebesBufferData& aThebesBufferData,
|
|
const nsIntRegion& aUpdatedRegion) override;
|
|
|
|
/**
|
|
* See CompositableForwarder::UseTextures
|
|
*/
|
|
virtual void UseTextures(CompositableClient* aCompositable,
|
|
const nsTArray<TimedTextureClient>& aTextures) override;
|
|
virtual void UseComponentAlphaTextures(CompositableClient* aCompositable,
|
|
TextureClient* aClientOnBlack,
|
|
TextureClient* aClientOnWhite) override;
|
|
#ifdef MOZ_WIDGET_GONK
|
|
virtual void UseOverlaySource(CompositableClient* aCompositable,
|
|
const OverlaySource& aOverlay,
|
|
const nsIntRect& aPictureRect) override;
|
|
#endif
|
|
|
|
/**
|
|
* End the current transaction and forward it to LayerManagerComposite.
|
|
* |aReplies| are directions from the LayerManagerComposite to the
|
|
* caller of EndTransaction().
|
|
*/
|
|
bool EndTransaction(InfallibleTArray<EditReply>* aReplies,
|
|
const nsIntRegion& aRegionToClear,
|
|
uint64_t aId,
|
|
bool aScheduleComposite,
|
|
uint32_t aPaintSequenceNumber,
|
|
bool aIsRepeatTransaction,
|
|
const mozilla::TimeStamp& aTransactionStart,
|
|
bool* aSent);
|
|
|
|
/**
|
|
* Set an actor through which layer updates will be pushed.
|
|
*/
|
|
void SetShadowManager(PLayerTransactionChild* aShadowManager);
|
|
|
|
/**
|
|
* Layout calls here to cache current plugin widget configuration
|
|
* data. We ship this across with the rest of the layer updates when
|
|
* we update. Chrome handles applying these changes.
|
|
*/
|
|
void StorePluginWidgetConfigurations(const nsTArray<nsIWidget::Configuration>&
|
|
aConfigurations);
|
|
|
|
void StopReceiveAsyncParentMessge();
|
|
|
|
void ClearCachedResources();
|
|
|
|
void Composite();
|
|
|
|
virtual void SendPendingAsyncMessges() override;
|
|
|
|
/**
|
|
* True if this is forwarding to a LayerManagerComposite.
|
|
*/
|
|
bool HasShadowManager() const { return !!mShadowManager; }
|
|
LayerTransactionChild* GetShadowManager() const { return mShadowManager.get(); }
|
|
|
|
virtual void WindowOverlayChanged() { mWindowOverlayChanged = true; }
|
|
|
|
/**
|
|
* The following Alloc/Open/Destroy interfaces abstract over the
|
|
* details of working with surfaces that are shared across
|
|
* processes. They provide the glue between C++ Layers and the
|
|
* LayerComposite IPC system.
|
|
*
|
|
* The basic lifecycle is
|
|
*
|
|
* - a Layer needs a buffer. Its ShadowableLayer subclass calls
|
|
* AllocBuffer(), then calls one of the Created*Buffer() methods
|
|
* above to transfer the (temporary) front buffer to its
|
|
* LayerComposite in the other process. The Layer needs a
|
|
* gfxASurface to paint, so the ShadowableLayer uses
|
|
* OpenDescriptor(backBuffer) to get that surface, and hands it
|
|
* out to the Layer.
|
|
*
|
|
* - a Layer has painted new pixels. Its ShadowableLayer calls one
|
|
* of the Painted*Buffer() methods above with the back buffer
|
|
* descriptor. This notification is forwarded to the LayerComposite,
|
|
* which uses OpenDescriptor() to access the newly-painted pixels.
|
|
* The LayerComposite then updates its front buffer in a Layer- and
|
|
* platform-dependent way, and sends a surface descriptor back to
|
|
* the ShadowableLayer that becomes its new back back buffer.
|
|
*
|
|
* - a Layer wants to destroy its buffers. Its ShadowableLayer
|
|
* calls Destroyed*Buffer(), which gives up control of the back
|
|
* buffer descriptor. The actual back buffer surface is then
|
|
* destroyed using DestroySharedSurface() just before notifying
|
|
* the parent process. When the parent process is notified, the
|
|
* LayerComposite also calls DestroySharedSurface() on its front
|
|
* buffer, and the double-buffer pair is gone.
|
|
*/
|
|
|
|
|
|
virtual bool AllocUnsafeShmem(size_t aSize,
|
|
mozilla::ipc::SharedMemory::SharedMemoryType aType,
|
|
mozilla::ipc::Shmem* aShmem) override;
|
|
virtual bool AllocShmem(size_t aSize,
|
|
mozilla::ipc::SharedMemory::SharedMemoryType aType,
|
|
mozilla::ipc::Shmem* aShmem) override;
|
|
virtual void DeallocShmem(mozilla::ipc::Shmem& aShmem) override;
|
|
|
|
virtual bool IPCOpen() const override;
|
|
|
|
virtual bool IsSameProcess() const override;
|
|
|
|
virtual MessageLoop* GetMessageLoop() const override { return mMessageLoop; }
|
|
|
|
base::ProcessId GetParentPid() const;
|
|
|
|
/**
|
|
* Construct a shadow of |aLayer| on the "other side", at the
|
|
* LayerManagerComposite.
|
|
*/
|
|
PLayerChild* ConstructShadowFor(ShadowableLayer* aLayer);
|
|
|
|
/**
|
|
* Flag the next paint as the first for a document.
|
|
*/
|
|
void SetIsFirstPaint() { mIsFirstPaint = true; }
|
|
|
|
void SetPaintSyncId(int32_t aSyncId) { mPaintSyncId = aSyncId; }
|
|
|
|
static void PlatformSyncBeforeUpdate();
|
|
|
|
virtual bool AllocSurfaceDescriptor(const gfx::IntSize& aSize,
|
|
gfxContentType aContent,
|
|
SurfaceDescriptor* aBuffer) override;
|
|
|
|
virtual bool AllocSurfaceDescriptorWithCaps(const gfx::IntSize& aSize,
|
|
gfxContentType aContent,
|
|
uint32_t aCaps,
|
|
SurfaceDescriptor* aBuffer) override;
|
|
|
|
virtual void DestroySurfaceDescriptor(SurfaceDescriptor* aSurface) override;
|
|
|
|
// Returns true if aSurface wraps a Shmem.
|
|
static bool IsShmem(SurfaceDescriptor* aSurface);
|
|
|
|
protected:
|
|
ShadowLayerForwarder();
|
|
|
|
#ifdef DEBUG
|
|
void CheckSurfaceDescriptor(const SurfaceDescriptor* aDescriptor) const;
|
|
#else
|
|
void CheckSurfaceDescriptor(const SurfaceDescriptor* aDescriptor) const {}
|
|
#endif
|
|
|
|
bool InWorkerThread();
|
|
|
|
RefPtr<LayerTransactionChild> mShadowManager;
|
|
|
|
private:
|
|
|
|
Transaction* mTxn;
|
|
MessageLoop* mMessageLoop;
|
|
std::vector<AsyncChildMessageData> mPendingAsyncMessages;
|
|
DiagnosticTypes mDiagnosticTypes;
|
|
bool mIsFirstPaint;
|
|
bool mWindowOverlayChanged;
|
|
int32_t mPaintSyncId;
|
|
InfallibleTArray<PluginWindowData> mPluginWindowData;
|
|
FixedSizeSmallShmemSectionAllocator* mSectionAllocator;
|
|
};
|
|
|
|
class CompositableClient;
|
|
|
|
/**
|
|
* A ShadowableLayer is a Layer can be shared with a parent context
|
|
* through a ShadowLayerForwarder. A ShadowableLayer maps to a
|
|
* Shadow*Layer in a parent context.
|
|
*
|
|
* Note that ShadowLayers can themselves be ShadowableLayers.
|
|
*/
|
|
class ShadowableLayer
|
|
{
|
|
public:
|
|
virtual ~ShadowableLayer() {}
|
|
|
|
virtual Layer* AsLayer() = 0;
|
|
|
|
/**
|
|
* True if this layer has a shadow in a parent process.
|
|
*/
|
|
bool HasShadow() { return !!mShadow; }
|
|
|
|
/**
|
|
* Return the IPC handle to a Shadow*Layer referring to this if one
|
|
* exists, nullptr if not.
|
|
*/
|
|
PLayerChild* GetShadow() { return mShadow; }
|
|
|
|
virtual CompositableClient* GetCompositableClient() { return nullptr; }
|
|
protected:
|
|
ShadowableLayer() : mShadow(nullptr) {}
|
|
|
|
PLayerChild* mShadow;
|
|
};
|
|
|
|
/// A simple shmem section allocator that can only allocate small
|
|
/// fixed size elements (only intended to be used to store tile
|
|
/// copy-on-write locks for now).
|
|
class FixedSizeSmallShmemSectionAllocator final : public ShmemSectionAllocator
|
|
{
|
|
public:
|
|
enum AllocationStatus
|
|
{
|
|
STATUS_ALLOCATED,
|
|
STATUS_FREED
|
|
};
|
|
|
|
struct ShmemSectionHeapHeader
|
|
{
|
|
Atomic<uint32_t> mTotalBlocks;
|
|
Atomic<uint32_t> mAllocatedBlocks;
|
|
};
|
|
|
|
struct ShmemSectionHeapAllocation
|
|
{
|
|
Atomic<uint32_t> mStatus;
|
|
uint32_t mSize;
|
|
};
|
|
|
|
explicit FixedSizeSmallShmemSectionAllocator(ShmemAllocator* aShmProvider);
|
|
|
|
~FixedSizeSmallShmemSectionAllocator();
|
|
|
|
virtual bool AllocShmemSection(uint32_t aSize, ShmemSection* aShmemSection) override;
|
|
|
|
virtual void DeallocShmemSection(ShmemSection& aShmemSection) override;
|
|
|
|
virtual void MemoryPressure() override { ShrinkShmemSectionHeap(); }
|
|
|
|
// can be called on the compositor process.
|
|
static void FreeShmemSection(ShmemSection& aShmemSection);
|
|
|
|
void ShrinkShmemSectionHeap();
|
|
|
|
protected:
|
|
std::vector<mozilla::ipc::Shmem> mUsedShmems;
|
|
ShmemAllocator* mShmProvider;
|
|
};
|
|
|
|
} // namespace layers
|
|
} // namespace mozilla
|
|
|
|
#endif // ifndef mozilla_layers_ShadowLayers_h
|