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Diffstat (limited to '')
| -rw-r--r-- | gfx/layers/client/TextureClient.cpp | 1794 |
1 files changed, 1794 insertions, 0 deletions
diff --git a/gfx/layers/client/TextureClient.cpp b/gfx/layers/client/TextureClient.cpp new file mode 100644 index 0000000000..252c6f4d6a --- /dev/null +++ b/gfx/layers/client/TextureClient.cpp @@ -0,0 +1,1794 @@ +/* -*- 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/TextureClient.h" + +#include <stdint.h> // for uint8_t, uint32_t, etc + +#include "BufferTexture.h" +#include "IPDLActor.h" +#include "ImageContainer.h" // for PlanarYCbCrData, etc +#include "MainThreadUtils.h" +#include "gfx2DGlue.h" +#include "gfxPlatform.h" // for gfxPlatform +#include "gfxUtils.h" // for gfxUtils::GetAsLZ4Base64Str +#include "mozilla/Atomics.h" +#include "mozilla/Mutex.h" +#include "mozilla/ProfilerLabels.h" +#include "mozilla/SchedulerGroup.h" +#include "mozilla/StaticPrefs_gfx.h" +#include "mozilla/StaticPrefs_layers.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/gfx/DataSurfaceHelpers.h" // for CreateDataSourceSurfaceByCloning +#include "mozilla/gfx/Logging.h" // for gfxDebug +#include "mozilla/gfx/gfxVars.h" +#include "mozilla/ipc/CrossProcessSemaphore.h" +#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc +#include "mozilla/layers/CompositableForwarder.h" +#include "mozilla/layers/ISurfaceAllocator.h" +#include "mozilla/layers/ImageBridgeChild.h" +#include "mozilla/layers/ImageDataSerializer.h" +#include "mozilla/layers/PTextureChild.h" +#include "mozilla/layers/TextureClientOGL.h" +#include "mozilla/layers/TextureClientRecycleAllocator.h" +#include "mozilla/layers/TextureRecorded.h" +#include "nsDebug.h" // for NS_ASSERTION, NS_WARNING, etc +#include "nsISerialEventTarget.h" +#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, etc +#include "nsPrintfCString.h" // for nsPrintfCString + +#ifdef XP_WIN +# include "gfx2DGlue.h" +# include "gfxWindowsPlatform.h" +# include "mozilla/gfx/DeviceManagerDx.h" +# include "mozilla/layers/TextureD3D11.h" +#endif +#ifdef MOZ_WAYLAND +# include <gtk/gtkx.h> + +# include "gfxPlatformGtk.h" +# include "mozilla/layers/DMABUFTextureClientOGL.h" +# include "mozilla/widget/nsWaylandDisplay.h" +#endif + +#ifdef XP_MACOSX +# include "mozilla/layers/MacIOSurfaceTextureClientOGL.h" +#endif + +#if 0 +# define RECYCLE_LOG(...) printf_stderr(__VA_ARGS__) +#else +# define RECYCLE_LOG(...) \ + do { \ + } while (0) +#endif + +namespace mozilla::layers { + +using namespace mozilla::ipc; +using namespace mozilla::gl; +using namespace mozilla::gfx; + +struct TextureDeallocParams { + TextureData* data; + RefPtr<TextureChild> actor; + RefPtr<LayersIPCChannel> allocator; + bool clientDeallocation; + bool syncDeallocation; +}; + +void DeallocateTextureClient(TextureDeallocParams params); + +/** + * TextureChild is the content-side incarnation of the PTexture IPDL actor. + * + * TextureChild is used to synchronize a texture client and its corresponding + * TextureHost if needed (a TextureClient that is not shared with the compositor + * does not have a TextureChild) + * + * During the deallocation phase, a TextureChild may hold its recently destroyed + * TextureClient's data until the compositor side confirmed that it is safe to + * deallocte or recycle the it. + */ +class TextureChild final : PTextureChild { + ~TextureChild() { + // We should have deallocated mTextureData in ActorDestroy + MOZ_ASSERT(!mTextureData); + MOZ_ASSERT_IF(!mOwnerCalledDestroy, !mTextureClient); + } + + public: + NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TextureChild) + + TextureChild() + : mCompositableForwarder(nullptr), + mTextureForwarder(nullptr), + mTextureClient(nullptr), + mTextureData(nullptr), + mDestroyed(false), + mIPCOpen(false), + mOwnsTextureData(false), + mOwnerCalledDestroy(false), + mUsesImageBridge(false) {} + + mozilla::ipc::IPCResult Recv__delete__() override { return IPC_OK(); } + + LayersIPCChannel* GetAllocator() { return mTextureForwarder; } + + void ActorDestroy(ActorDestroyReason why) override; + + bool IPCOpen() const { return mIPCOpen; } + + void Lock() const { + if (mUsesImageBridge) { + mLock.Enter(); + } + } + + void Unlock() const { + if (mUsesImageBridge) { + mLock.Leave(); + } + } + + private: + // AddIPDLReference and ReleaseIPDLReference are only to be called by + // CreateIPDLActor and DestroyIPDLActor, respectively. We intentionally make + // them private to prevent misuse. The purpose of these methods is to be aware + // of when the IPC system around this actor goes down: mIPCOpen is then set to + // false. + void AddIPDLReference() { + MOZ_ASSERT(mIPCOpen == false); + mIPCOpen = true; + AddRef(); + } + void ReleaseIPDLReference() { + MOZ_ASSERT(mIPCOpen == false); + Release(); + } + + /// The normal way to destroy the actor. + /// + /// This will asynchronously send a Destroy message to the parent actor, whom + /// will send the delete message. + void Destroy(const TextureDeallocParams& aParams); + + // This lock is used order to prevent several threads to access the + // TextureClient's data concurrently. In particular, it prevents shutdown + // code to destroy a texture while another thread is reading or writing into + // it. + // In most places, the lock is held in short and bounded scopes in which we + // don't block on any other resource. There are few exceptions to this, which + // are discussed below. + // + // The locking pattern of TextureClient may in some case upset deadlock + // detection tools such as TSan. Typically our tile rendering code will lock + // all of its tiles, render into them and unlock them all right after that, + // which looks something like: + // + // Lock tile A + // Lock tile B + // Lock tile C + // Apply drawing commands to tiles A, B and C + // Unlock tile A + // Unlock tile B + // Unlock tile C + // + // And later, we may end up rendering a tile buffer that has the same tiles, + // in a different order, for example: + // + // Lock tile B + // Lock tile A + // Lock tile D + // Apply drawing commands to tiles A, B and D + // Unlock tile B + // Unlock tile A + // Unlock tile D + // + // This is because textures being expensive to create, we recycle them as much + // as possible and they may reappear in the tile buffer in a different order. + // + // Unfortunately this is not very friendly to TSan's analysis, which will see + // that B was once locked while A was locked, and then A locked while B was + // locked. TSan identifies this as a potential dead-lock which would be the + // case if this kind of inconsistent and dependent locking order was happening + // concurrently. + // In the case of TextureClient, dependent locking only ever happens on the + // thread that draws into the texture (let's call it the producer thread). + // Other threads may call into a method that can lock the texture in a short + // and bounded scope inside of which it is not allowed to do anything that + // could cause the thread to block. A given texture can only have one producer + // thread. + // + // Another example of TSan-unfriendly locking pattern is when copying a + // texture into another, which also never happens outside of the producer + // thread. Copying A into B looks like this: + // + // Lock texture B + // Lock texture A + // Copy A into B + // Unlock A + // Unlock B + // + // In a given frame we may need to copy A into B and in another frame copy + // B into A. For example A and B can be the Front and Back buffers, + // alternating roles and the copy is needed to avoid the cost of re-drawing + // the valid region. + // + // The important rule is that all of the dependent locking must occur only + // in the texture's producer thread to avoid deadlocks. + mutable gfx::CriticalSection mLock; + + RefPtr<CompositableForwarder> mCompositableForwarder; + RefPtr<TextureForwarder> mTextureForwarder; + + TextureClient* mTextureClient; + TextureData* mTextureData; + Atomic<bool> mDestroyed; + bool mIPCOpen; + bool mOwnsTextureData; + bool mOwnerCalledDestroy; + bool mUsesImageBridge; + + friend class TextureClient; + friend void DeallocateTextureClient(TextureDeallocParams params); +}; + +static inline gfx::BackendType BackendTypeForBackendSelector( + LayersBackend aLayersBackend, BackendSelector aSelector) { + switch (aSelector) { + case BackendSelector::Canvas: + return gfxPlatform::GetPlatform()->GetPreferredCanvasBackend(); + case BackendSelector::Content: + return gfxPlatform::GetPlatform()->GetContentBackendFor(aLayersBackend); + default: + MOZ_ASSERT_UNREACHABLE("Unknown backend selector"); + return gfx::BackendType::NONE; + } +}; + +static TextureType GetTextureType(gfx::SurfaceFormat aFormat, + gfx::IntSize aSize, + KnowsCompositor* aKnowsCompositor, + BackendSelector aSelector, + TextureAllocationFlags aAllocFlags) { + LayersBackend layersBackend = aKnowsCompositor->GetCompositorBackendType(); + gfx::BackendType moz2DBackend = + BackendTypeForBackendSelector(layersBackend, aSelector); + Unused << moz2DBackend; + +#ifdef XP_WIN + int32_t maxTextureSize = aKnowsCompositor->GetMaxTextureSize(); + if ((layersBackend == LayersBackend::LAYERS_WR && + !aKnowsCompositor->UsingSoftwareWebRender()) && + (moz2DBackend == gfx::BackendType::DIRECT2D || + moz2DBackend == gfx::BackendType::DIRECT2D1_1) && + aSize.width <= maxTextureSize && aSize.height <= maxTextureSize && + !(aAllocFlags & (ALLOC_UPDATE_FROM_SURFACE | ALLOC_DO_NOT_ACCELERATE))) { + return TextureType::D3D11; + } +#endif + +#ifdef MOZ_WAYLAND + if ((layersBackend == LayersBackend::LAYERS_WR && + !aKnowsCompositor->UsingSoftwareWebRender()) && + widget::DMABufDevice::IsDMABufTexturesEnabled() && + aFormat != SurfaceFormat::A8) { + return TextureType::DMABUF; + } +#endif + +#ifdef XP_MACOSX + if (StaticPrefs::gfx_use_iosurface_textures_AtStartup()) { + return TextureType::MacIOSurface; + } +#endif + +#ifdef MOZ_WIDGET_ANDROID + if (StaticPrefs::gfx_use_surfacetexture_textures_AtStartup()) { + return TextureType::AndroidNativeWindow; + } +#endif + + return TextureType::Unknown; +} + +TextureType PreferredCanvasTextureType(KnowsCompositor* aKnowsCompositor) { + return GetTextureType(gfx::SurfaceFormat::R8G8B8A8, {1, 1}, aKnowsCompositor, + BackendSelector::Canvas, + TextureAllocationFlags::ALLOC_DEFAULT); +} + +static bool ShouldRemoteTextureType(TextureType aTextureType, + BackendSelector aSelector) { + if (aSelector != BackendSelector::Canvas || !gfxPlatform::UseRemoteCanvas()) { + return false; + } + + switch (aTextureType) { + case TextureType::D3D11: + return true; + default: + return false; + } +} + +/* static */ +TextureData* TextureData::Create(TextureForwarder* aAllocator, + gfx::SurfaceFormat aFormat, gfx::IntSize aSize, + KnowsCompositor* aKnowsCompositor, + BackendSelector aSelector, + TextureFlags aTextureFlags, + TextureAllocationFlags aAllocFlags) { + TextureType textureType = + GetTextureType(aFormat, aSize, aKnowsCompositor, aSelector, aAllocFlags); + + if (ShouldRemoteTextureType(textureType, aSelector)) { + RefPtr<CanvasChild> canvasChild = aAllocator->GetCanvasChild(); + if (canvasChild) { + return new RecordedTextureData(canvasChild.forget(), aSize, aFormat, + textureType); + } + + // We don't have a CanvasChild, but are supposed to be remote. + // Fall back to software. + textureType = TextureType::Unknown; + } + +#if defined(XP_MACOSX) || defined(MOZ_WAYLAND) + gfx::BackendType moz2DBackend = BackendTypeForBackendSelector( + aKnowsCompositor->GetCompositorBackendType(), aSelector); +#endif + + switch (textureType) { +#ifdef XP_WIN + case TextureType::D3D11: + return D3D11TextureData::Create(aSize, aFormat, aAllocFlags); +#endif + +#ifdef MOZ_WAYLAND + case TextureType::DMABUF: + return DMABUFTextureData::Create(aSize, aFormat, moz2DBackend); +#endif + +#ifdef XP_MACOSX + case TextureType::MacIOSurface: + return MacIOSurfaceTextureData::Create(aSize, aFormat, moz2DBackend); +#endif +#ifdef MOZ_WIDGET_ANDROID + case TextureType::AndroidNativeWindow: + return AndroidNativeWindowTextureData::Create(aSize, aFormat); +#endif + default: + return nullptr; + } +} + +/* static */ +bool TextureData::IsRemote(KnowsCompositor* aKnowsCompositor, + BackendSelector aSelector) { + TextureType textureType = GetTextureType( + gfx::SurfaceFormat::UNKNOWN, gfx::IntSize(1, 1), aKnowsCompositor, + aSelector, TextureAllocationFlags::ALLOC_DEFAULT); + + return ShouldRemoteTextureType(textureType, aSelector); +} + +static void DestroyTextureData(TextureData* aTextureData, + LayersIPCChannel* aAllocator, bool aDeallocate) { + if (!aTextureData) { + return; + } + + if (aDeallocate) { + aTextureData->Deallocate(aAllocator); + } else { + aTextureData->Forget(aAllocator); + } + delete aTextureData; +} + +void TextureChild::ActorDestroy(ActorDestroyReason why) { + AUTO_PROFILER_LABEL("TextureChild::ActorDestroy", GRAPHICS); + MOZ_ASSERT(mIPCOpen); + mIPCOpen = false; + + if (mTextureData) { + DestroyTextureData(mTextureData, GetAllocator(), mOwnsTextureData); + mTextureData = nullptr; + } +} + +void TextureChild::Destroy(const TextureDeallocParams& aParams) { + MOZ_ASSERT(!mOwnerCalledDestroy); + if (mOwnerCalledDestroy) { + return; + } + + mOwnerCalledDestroy = true; + + if (!IPCOpen()) { + DestroyTextureData(aParams.data, aParams.allocator, + aParams.clientDeallocation); + return; + } + + // DestroyTextureData will be called by TextureChild::ActorDestroy + mTextureData = aParams.data; + mOwnsTextureData = aParams.clientDeallocation; + + if (!mCompositableForwarder || + !mCompositableForwarder->DestroyInTransaction(this)) { + this->SendDestroy(); + } +} + +/* static */ +Atomic<uint64_t> TextureClient::sSerialCounter(0); + +static void DeallocateTextureClientSyncProxy(TextureDeallocParams params, + ReentrantMonitor* aBarrier, + bool* aDone) { + DeallocateTextureClient(params); + ReentrantMonitorAutoEnter autoMon(*aBarrier); + *aDone = true; + aBarrier->NotifyAll(); +} + +/// The logic for synchronizing a TextureClient's deallocation goes here. +/// +/// This funciton takes care of dispatching work to the right thread using +/// a synchronous proxy if needed, and handles client/host deallocation. +void DeallocateTextureClient(TextureDeallocParams params) { + if (!params.actor && !params.data) { + // Nothing to do + return; + } + + TextureChild* actor = params.actor; + nsCOMPtr<nsISerialEventTarget> ipdlThread; + + if (params.allocator) { + ipdlThread = params.allocator->GetThread(); + if (!ipdlThread) { + // An allocator with no thread means we are too late in the shutdown + // sequence. + gfxCriticalError() << "Texture deallocated too late during shutdown"; + return; + } + } + + // First make sure that the work is happening on the IPDL thread. + if (ipdlThread && !ipdlThread->IsOnCurrentThread()) { + if (params.syncDeallocation) { + bool done = false; + ReentrantMonitor barrier MOZ_UNANNOTATED("DeallocateTextureClient"); + ReentrantMonitorAutoEnter autoMon(barrier); + ipdlThread->Dispatch(NewRunnableFunction( + "DeallocateTextureClientSyncProxyRunnable", + DeallocateTextureClientSyncProxy, params, &barrier, &done)); + while (!done) { + barrier.Wait(); + } + } else { + ipdlThread->Dispatch(NewRunnableFunction( + "DeallocateTextureClientRunnable", DeallocateTextureClient, params)); + } + // The work has been forwarded to the IPDL thread, we are done. + return; + } + + // Below this line, we are either in the IPDL thread or ther is no IPDL + // thread anymore. + + if (!ipdlThread) { + // If we don't have a thread we can't know for sure that we are in + // the IPDL thread and use the LayersIPCChannel. + // This should ideally not happen outside of gtest, but some shutdown + // raciness could put us in this situation. + params.allocator = nullptr; + } + + if (!actor) { + // We don't have an IPDL actor, probably because we destroyed the + // TextureClient before sharing it with the compositor. It means the data + // cannot be owned by the TextureHost since we never created the + // TextureHost... + DestroyTextureData(params.data, params.allocator, /* aDeallocate */ true); + return; + } + + actor->Destroy(params); +} + +void TextureClient::Destroy() { + // Async paints should have been flushed by now. + MOZ_RELEASE_ASSERT(mPaintThreadRefs == 0); + + if (mActor && !mIsLocked) { + mActor->Lock(); + } + + mBorrowedDrawTarget = nullptr; + mReadLock = nullptr; + + RefPtr<TextureChild> actor = mActor; + mActor = nullptr; + + if (actor && !actor->mDestroyed.compareExchange(false, true)) { + actor->Unlock(); + actor = nullptr; + } + + TextureData* data = mData; + mData = nullptr; + + if (data || actor) { + TextureDeallocParams params; + params.actor = actor; + params.allocator = mAllocator; + params.clientDeallocation = !!(mFlags & TextureFlags::DEALLOCATE_CLIENT); + params.data = data; + // At the moment we always deallocate synchronously when deallocating on the + // client side, but having asynchronous deallocate in some of the cases will + // be a worthwhile optimization. + params.syncDeallocation = !!(mFlags & TextureFlags::DEALLOCATE_CLIENT); + + // Release the lock before calling DeallocateTextureClient because the + // latter may wait for the main thread which could create a dead-lock. + + if (actor) { + actor->Unlock(); + } + + DeallocateTextureClient(params); + } +} + +void TextureClient::LockActor() const { + if (mActor) { + mActor->Lock(); + } +} + +void TextureClient::UnlockActor() const { + if (mActor) { + mActor->Unlock(); + } +} + +bool TextureClient::IsReadLocked() const { + if (!mReadLock) { + return false; + } + MOZ_ASSERT(mReadLock->AsNonBlockingLock(), + "Can only check locked for non-blocking locks!"); + return mReadLock->AsNonBlockingLock()->GetReadCount() > 1; +} + +bool TextureClient::TryReadLock() { + if (!mReadLock || mIsReadLocked) { + return true; + } + + if (mReadLock->AsNonBlockingLock()) { + if (IsReadLocked()) { + return false; + } + } + + if (!mReadLock->TryReadLock(TimeDuration::FromMilliseconds(500))) { + return false; + } + + mIsReadLocked = true; + return true; +} + +void TextureClient::ReadUnlock() { + if (!mIsReadLocked) { + return; + } + MOZ_ASSERT(mReadLock); + mReadLock->ReadUnlock(); + mIsReadLocked = false; +} + +bool TextureClient::Lock(OpenMode aMode) { + MOZ_ASSERT(IsValid()); + MOZ_ASSERT(!mIsLocked); + if (!IsValid()) { + return false; + } + if (mIsLocked) { + return mOpenMode == aMode; + } + + if ((aMode & OpenMode::OPEN_WRITE || !mInfo.canConcurrentlyReadLock) && + !TryReadLock()) { + // Only warn if attempting to write. Attempting to read is acceptable usage. + if (aMode & OpenMode::OPEN_WRITE) { + NS_WARNING( + "Attempt to Lock a texture that is being read by the compositor!"); + } + return false; + } + + LockActor(); + + mIsLocked = mData->Lock(aMode); + mOpenMode = aMode; + + auto format = GetFormat(); + if (mIsLocked && CanExposeDrawTarget() && + (aMode & OpenMode::OPEN_READ_WRITE) == OpenMode::OPEN_READ_WRITE && + NS_IsMainThread() && + // the formats that we apparently expect, in the cairo backend. Any other + // format will trigger an assertion in GfxFormatToCairoFormat. + (format == SurfaceFormat::A8R8G8B8_UINT32 || + format == SurfaceFormat::X8R8G8B8_UINT32 || + format == SurfaceFormat::A8 || format == SurfaceFormat::R5G6B5_UINT16)) { + if (!BorrowDrawTarget()) { + // Failed to get a DrawTarget, means we won't be able to write into the + // texture, might as well fail now. + Unlock(); + return false; + } + } + + if (!mIsLocked) { + UnlockActor(); + ReadUnlock(); + } + + return mIsLocked; +} + +void TextureClient::Unlock() { + MOZ_ASSERT(IsValid()); + MOZ_ASSERT(mIsLocked); + if (!IsValid() || !mIsLocked) { + return; + } + + if (mBorrowedDrawTarget) { + if (!(mOpenMode & OpenMode::OPEN_ASYNC)) { + if (mOpenMode & OpenMode::OPEN_WRITE) { + mBorrowedDrawTarget->Flush(); + } + + mBorrowedDrawTarget->DetachAllSnapshots(); + // If this assertion is hit, it means something is holding a strong + // reference to our DrawTarget externally, which is not allowed. + MOZ_ASSERT(mBorrowedDrawTarget->refCount() <= mExpectedDtRefs); + } + + mBorrowedDrawTarget = nullptr; + } + + if (mOpenMode & OpenMode::OPEN_WRITE) { + mUpdated = true; + } + + if (mData) { + mData->Unlock(); + } + mIsLocked = false; + mOpenMode = OpenMode::OPEN_NONE; + + UnlockActor(); + ReadUnlock(); +} + +void TextureClient::EnableReadLock() { + if (!mReadLock) { + if (mAllocator->GetTileLockAllocator()) { + mReadLock = NonBlockingTextureReadLock::Create(mAllocator); + } else { + // IPC is down + gfxCriticalError() << "TextureClient::EnableReadLock IPC is down"; + } + } +} + +bool TextureClient::OnForwardedToHost() { + if (mData) { + mData->OnForwardedToHost(); + } + + if (mReadLock && mUpdated) { + // Take a read lock on behalf of the TextureHost. The latter will unlock + // after the shared data is available again for drawing. + mReadLock->ReadLock(); + mUpdated = false; + return true; + } + + return false; +} + +TextureClient::~TextureClient() { + // TextureClients should be kept alive while there are references on the + // paint thread. + MOZ_ASSERT(mPaintThreadRefs == 0); + mReadLock = nullptr; + Destroy(); +} + +void TextureClient::UpdateFromSurface(gfx::SourceSurface* aSurface) { + MOZ_ASSERT(IsValid()); + MOZ_ASSERT(mIsLocked); + MOZ_ASSERT(aSurface); + // If you run into this assertion, make sure the texture was locked write-only + // rather than read-write. + MOZ_ASSERT(!mBorrowedDrawTarget); + + // XXX - It would be better to first try the DrawTarget approach and fallback + // to the backend-specific implementation because the latter will usually do + // an expensive read-back + cpu-side copy if the texture is on the gpu. + // There is a bug with the DrawTarget approach, though specific to reading + // back from WebGL (where R and B channel end up inverted) to figure out + // first. + if (mData->UpdateFromSurface(aSurface)) { + return; + } + if (CanExposeDrawTarget() && NS_IsMainThread()) { + RefPtr<DrawTarget> dt = BorrowDrawTarget(); + + MOZ_ASSERT(dt); + if (dt) { + dt->CopySurface(aSurface, + gfx::IntRect(gfx::IntPoint(0, 0), aSurface->GetSize()), + gfx::IntPoint(0, 0)); + return; + } + } + NS_WARNING("TextureClient::UpdateFromSurface failed"); +} + +already_AddRefed<TextureClient> TextureClient::CreateSimilar( + LayersBackend aLayersBackend, TextureFlags aFlags, + TextureAllocationFlags aAllocFlags) const { + MOZ_ASSERT(IsValid()); + + MOZ_ASSERT(!mIsLocked); + if (mIsLocked) { + return nullptr; + } + + LockActor(); + TextureData* data = + mData->CreateSimilar(mAllocator, aLayersBackend, aFlags, aAllocFlags); + UnlockActor(); + + if (!data) { + return nullptr; + } + + return MakeAndAddRef<TextureClient>(data, aFlags, mAllocator); +} + +gfx::DrawTarget* TextureClient::BorrowDrawTarget() { + MOZ_ASSERT(IsValid()); + MOZ_ASSERT(mIsLocked); + // TODO- We can't really assert that at the moment because there is code that + // Borrows the DrawTarget, just to get a snapshot, which is legit in term of + // OpenMode but we should have a way to get a SourceSurface directly instead. + // MOZ_ASSERT(mOpenMode & OpenMode::OPEN_WRITE); + + if (!IsValid() || !mIsLocked) { + return nullptr; + } + + if (!mBorrowedDrawTarget) { + mBorrowedDrawTarget = mData->BorrowDrawTarget(); +#ifdef DEBUG + mExpectedDtRefs = mBorrowedDrawTarget ? mBorrowedDrawTarget->refCount() : 0; +#endif + } + + return mBorrowedDrawTarget; +} + +void TextureClient::EndDraw() { + MOZ_ASSERT(mOpenMode & OpenMode::OPEN_READ_WRITE); + + // Because EndDraw is used when we are not unlocking this TextureClient at the + // end of a transaction, we need to Flush and DetachAllSnapshots to ensure any + // dependents are updated. + mBorrowedDrawTarget->Flush(); + mBorrowedDrawTarget->DetachAllSnapshots(); + MOZ_ASSERT(mBorrowedDrawTarget->refCount() <= mExpectedDtRefs); + + mBorrowedDrawTarget = nullptr; + mData->EndDraw(); +} + +already_AddRefed<gfx::SourceSurface> TextureClient::BorrowSnapshot() { + MOZ_ASSERT(mIsLocked); + + RefPtr<gfx::SourceSurface> surface = mData->BorrowSnapshot(); + if (!surface) { + surface = BorrowDrawTarget()->Snapshot(); + } + + return surface.forget(); +} + +bool TextureClient::BorrowMappedData(MappedTextureData& aMap) { + MOZ_ASSERT(IsValid()); + + // TODO - SharedRGBImage just accesses the buffer without properly locking + // the texture. It's bad. + // MOZ_ASSERT(mIsLocked); + // if (!mIsLocked) { + // return nullptr; + //} + + return mData ? mData->BorrowMappedData(aMap) : false; +} + +bool TextureClient::BorrowMappedYCbCrData(MappedYCbCrTextureData& aMap) { + MOZ_ASSERT(IsValid()); + + return mData ? mData->BorrowMappedYCbCrData(aMap) : false; +} + +bool TextureClient::ToSurfaceDescriptor(SurfaceDescriptor& aOutDescriptor) { + MOZ_ASSERT(IsValid()); + + return mData ? mData->Serialize(aOutDescriptor) : false; +} + +// static +PTextureChild* TextureClient::CreateIPDLActor() { + TextureChild* c = new TextureChild(); + c->AddIPDLReference(); + return c; +} + +// static +bool TextureClient::DestroyIPDLActor(PTextureChild* actor) { + static_cast<TextureChild*>(actor)->ReleaseIPDLReference(); + return true; +} + +// static +already_AddRefed<TextureClient> TextureClient::AsTextureClient( + PTextureChild* actor) { + if (!actor) { + return nullptr; + } + + TextureChild* tc = static_cast<TextureChild*>(actor); + + tc->Lock(); + + // Since TextureClient may be destroyed asynchronously with respect to its + // IPDL actor, we must acquire a reference within a lock. The mDestroyed bit + // tells us whether or not the main thread has disconnected the TextureClient + // from its actor. + if (tc->mDestroyed) { + tc->Unlock(); + return nullptr; + } + + RefPtr<TextureClient> texture = tc->mTextureClient; + tc->Unlock(); + + return texture.forget(); +} + +bool TextureClient::IsSharedWithCompositor() const { + return mActor && mActor->IPCOpen(); +} + +void TextureClient::AddFlags(TextureFlags aFlags) { + MOZ_ASSERT( + !IsSharedWithCompositor() || + ((GetFlags() & TextureFlags::RECYCLE) && !IsAddedToCompositableClient())); + mFlags |= aFlags; +} + +void TextureClient::RemoveFlags(TextureFlags aFlags) { + MOZ_ASSERT( + !IsSharedWithCompositor() || + ((GetFlags() & TextureFlags::RECYCLE) && !IsAddedToCompositableClient())); + mFlags &= ~aFlags; +} + +void TextureClient::RecycleTexture(TextureFlags aFlags) { + MOZ_ASSERT(GetFlags() & TextureFlags::RECYCLE); + MOZ_ASSERT(!mIsLocked); + + mAddedToCompositableClient = false; + if (mFlags != aFlags) { + mFlags = aFlags; + } +} + +void TextureClient::SetAddedToCompositableClient() { + if (!mAddedToCompositableClient) { + mAddedToCompositableClient = true; + if (!(GetFlags() & TextureFlags::RECYCLE)) { + return; + } + MOZ_ASSERT(!mIsLocked); + LockActor(); + if (IsValid() && mActor && !mActor->mDestroyed && mActor->IPCOpen()) { + mActor->SendRecycleTexture(mFlags); + } + UnlockActor(); + } +} + +static void CancelTextureClientNotifyNotUsed(uint64_t aTextureId, + LayersIPCChannel* aAllocator) { + if (!aAllocator) { + return; + } + nsCOMPtr<nsISerialEventTarget> thread = aAllocator->GetThread(); + if (!thread) { + return; + } + if (thread->IsOnCurrentThread()) { + aAllocator->CancelWaitForNotifyNotUsed(aTextureId); + } else { + thread->Dispatch(NewRunnableFunction( + "CancelTextureClientNotifyNotUsedRunnable", + CancelTextureClientNotifyNotUsed, aTextureId, aAllocator)); + } +} + +void TextureClient::CancelWaitForNotifyNotUsed() { + if (GetFlags() & TextureFlags::RECYCLE) { + CancelTextureClientNotifyNotUsed(mSerial, GetAllocator()); + return; + } +} + +/* static */ +void TextureClient::TextureClientRecycleCallback(TextureClient* aClient, + void* aClosure) { + MOZ_ASSERT(aClient->GetRecycleAllocator()); + aClient->GetRecycleAllocator()->RecycleTextureClient(aClient); +} + +void TextureClient::SetRecycleAllocator( + ITextureClientRecycleAllocator* aAllocator) { + mRecycleAllocator = aAllocator; + if (aAllocator) { + SetRecycleCallback(TextureClientRecycleCallback, nullptr); + } else { + ClearRecycleCallback(); + } +} + +bool TextureClient::InitIPDLActor(CompositableForwarder* aForwarder) { + MOZ_ASSERT(aForwarder && aForwarder->GetTextureForwarder()->GetThread() == + mAllocator->GetThread()); + + if (mActor && !mActor->IPCOpen()) { + return false; + } + + if (mActor && !mActor->mDestroyed) { + CompositableForwarder* currentFwd = mActor->mCompositableForwarder; + TextureForwarder* currentTexFwd = mActor->mTextureForwarder; + if (currentFwd != aForwarder) { + // It's a bit iffy but right now ShadowLayerForwarder inherits + // TextureForwarder even though it should not. + // ShadowLayerForwarder::GetTextureForwarder actually returns a pointer to + // the CompositorBridgeChild. It's Ok for a texture to move from a + // ShadowLayerForwarder to another, but not form a CompositorBridgeChild + // to another (they use different channels). + if (currentTexFwd && currentTexFwd != aForwarder->GetTextureForwarder()) { + gfxCriticalError() + << "Attempt to move a texture to a different channel CF."; + MOZ_ASSERT_UNREACHABLE("unexpected to be called"); + return false; + } + if (currentFwd && currentFwd->GetCompositorBackendType() != + aForwarder->GetCompositorBackendType()) { + gfxCriticalError() + << "Attempt to move a texture to different compositor backend."; + MOZ_ASSERT_UNREACHABLE("unexpected to be called"); + return false; + } + mActor->mCompositableForwarder = aForwarder; + mActor->mUsesImageBridge = + aForwarder->GetTextureForwarder()->UsesImageBridge(); + } + return true; + } + MOZ_ASSERT(!mActor || mActor->mDestroyed, + "Cannot use a texture on several IPC channels."); + + SurfaceDescriptor desc; + if (!ToSurfaceDescriptor(desc)) { + return false; + } + + // Try external image id allocation. + mExternalImageId = + aForwarder->GetTextureForwarder()->GetNextExternalImageId(); + + ReadLockDescriptor readLockDescriptor = null_t(); + if (mReadLock) { + mReadLock->Serialize(readLockDescriptor, GetAllocator()->GetParentPid()); + } + + PTextureChild* actor = aForwarder->GetTextureForwarder()->CreateTexture( + desc, std::move(readLockDescriptor), + aForwarder->GetCompositorBackendType(), GetFlags(), + dom::ContentParentId(), mSerial, mExternalImageId); + + if (!actor) { + gfxCriticalNote << static_cast<int32_t>(desc.type()) << ", " + << static_cast<int32_t>( + aForwarder->GetCompositorBackendType()) + << ", " << static_cast<uint32_t>(GetFlags()) << ", " + << mSerial; + return false; + } + + mActor = static_cast<TextureChild*>(actor); + mActor->mCompositableForwarder = aForwarder; + mActor->mTextureForwarder = aForwarder->GetTextureForwarder(); + mActor->mTextureClient = this; + + // If the TextureClient is already locked, we have to lock TextureChild's + // mutex since it will be unlocked in TextureClient::Unlock. + if (mIsLocked) { + LockActor(); + } + + return mActor->IPCOpen(); +} + +bool TextureClient::InitIPDLActor(KnowsCompositor* aKnowsCompositor, + const dom::ContentParentId& aContentId) { + MOZ_ASSERT(aKnowsCompositor && + aKnowsCompositor->GetTextureForwarder()->GetThread() == + mAllocator->GetThread()); + TextureForwarder* fwd = aKnowsCompositor->GetTextureForwarder(); + if (mActor && !mActor->mDestroyed) { + CompositableForwarder* currentFwd = mActor->mCompositableForwarder; + TextureForwarder* currentTexFwd = mActor->mTextureForwarder; + + if (currentFwd) { + gfxCriticalError() + << "Attempt to remove a texture from a CompositableForwarder."; + return false; + } + + if (currentTexFwd && currentTexFwd != fwd) { + gfxCriticalError() + << "Attempt to move a texture to a different channel TF."; + return false; + } + mActor->mTextureForwarder = fwd; + return true; + } + MOZ_ASSERT(!mActor || mActor->mDestroyed, + "Cannot use a texture on several IPC channels."); + + SurfaceDescriptor desc; + if (!ToSurfaceDescriptor(desc)) { + return false; + } + + // Try external image id allocation. + mExternalImageId = + aKnowsCompositor->GetTextureForwarder()->GetNextExternalImageId(); + + ReadLockDescriptor readLockDescriptor = null_t(); + if (mReadLock) { + mReadLock->Serialize(readLockDescriptor, GetAllocator()->GetParentPid()); + } + + PTextureChild* actor = + fwd->CreateTexture(desc, std::move(readLockDescriptor), + aKnowsCompositor->GetCompositorBackendType(), + GetFlags(), aContentId, mSerial, mExternalImageId); + if (!actor) { + gfxCriticalNote << static_cast<int32_t>(desc.type()) << ", " + << static_cast<int32_t>( + aKnowsCompositor->GetCompositorBackendType()) + << ", " << static_cast<uint32_t>(GetFlags()) << ", " + << mSerial; + return false; + } + + mActor = static_cast<TextureChild*>(actor); + mActor->mTextureForwarder = fwd; + mActor->mTextureClient = this; + + // If the TextureClient is already locked, we have to lock TextureChild's + // mutex since it will be unlocked in TextureClient::Unlock. + if (mIsLocked) { + LockActor(); + } + + return mActor->IPCOpen(); +} + +PTextureChild* TextureClient::GetIPDLActor() { return mActor; } + +// static +already_AddRefed<TextureClient> TextureClient::CreateForDrawing( + KnowsCompositor* aAllocator, gfx::SurfaceFormat aFormat, gfx::IntSize aSize, + BackendSelector aSelector, TextureFlags aTextureFlags, + TextureAllocationFlags aAllocFlags) { + return TextureClient::CreateForDrawing(aAllocator->GetTextureForwarder(), + aFormat, aSize, aAllocator, aSelector, + aTextureFlags, aAllocFlags); +} + +// static +already_AddRefed<TextureClient> TextureClient::CreateForDrawing( + TextureForwarder* aAllocator, gfx::SurfaceFormat aFormat, + gfx::IntSize aSize, KnowsCompositor* aKnowsCompositor, + BackendSelector aSelector, TextureFlags aTextureFlags, + TextureAllocationFlags aAllocFlags) { + LayersBackend layersBackend = aKnowsCompositor->GetCompositorBackendType(); + gfx::BackendType moz2DBackend = + BackendTypeForBackendSelector(layersBackend, aSelector); + + // also test the validity of aAllocator + if (!aAllocator || !aAllocator->IPCOpen()) { + return nullptr; + } + + if (!gfx::Factory::AllowedSurfaceSize(aSize)) { + return nullptr; + } + + TextureData* data = + TextureData::Create(aAllocator, aFormat, aSize, aKnowsCompositor, + aSelector, aTextureFlags, aAllocFlags); + + if (data) { + return MakeAndAddRef<TextureClient>(data, aTextureFlags, aAllocator); + } + + // Can't do any better than a buffer texture client. + return TextureClient::CreateForRawBufferAccess(aAllocator, aFormat, aSize, + moz2DBackend, layersBackend, + aTextureFlags, aAllocFlags); +} + +// static +already_AddRefed<TextureClient> TextureClient::CreateFromSurface( + KnowsCompositor* aAllocator, gfx::SourceSurface* aSurface, + BackendSelector aSelector, TextureFlags aTextureFlags, + TextureAllocationFlags aAllocFlags) { + // also test the validity of aAllocator + if (!aAllocator || !aAllocator->GetTextureForwarder()->IPCOpen()) { + return nullptr; + } + + gfx::IntSize size = aSurface->GetSize(); + + if (!gfx::Factory::AllowedSurfaceSize(size)) { + return nullptr; + } + + TextureData* data = nullptr; +#if defined(XP_WIN) + LayersBackend layersBackend = aAllocator->GetCompositorBackendType(); + gfx::BackendType moz2DBackend = + BackendTypeForBackendSelector(layersBackend, aSelector); + + int32_t maxTextureSize = aAllocator->GetMaxTextureSize(); + + if (layersBackend == LayersBackend::LAYERS_WR && + (moz2DBackend == gfx::BackendType::DIRECT2D || + moz2DBackend == gfx::BackendType::DIRECT2D1_1) && + size.width <= maxTextureSize && size.height <= maxTextureSize) { + data = D3D11TextureData::Create(aSurface, aAllocFlags); + } +#endif + + if (data) { + return MakeAndAddRef<TextureClient>(data, aTextureFlags, + aAllocator->GetTextureForwarder()); + } + + // Fall back to using UpdateFromSurface + + TextureAllocationFlags allocFlags = + TextureAllocationFlags(aAllocFlags | ALLOC_UPDATE_FROM_SURFACE); + RefPtr<TextureClient> client = + CreateForDrawing(aAllocator, aSurface->GetFormat(), size, aSelector, + aTextureFlags, allocFlags); + if (!client) { + return nullptr; + } + + TextureClientAutoLock autoLock(client, OpenMode::OPEN_WRITE_ONLY); + if (!autoLock.Succeeded()) { + return nullptr; + } + + client->UpdateFromSurface(aSurface); + return client.forget(); +} + +// static +already_AddRefed<TextureClient> TextureClient::CreateForRawBufferAccess( + KnowsCompositor* aAllocator, gfx::SurfaceFormat aFormat, gfx::IntSize aSize, + gfx::BackendType aMoz2DBackend, TextureFlags aTextureFlags, + TextureAllocationFlags aAllocFlags) { + return CreateForRawBufferAccess( + aAllocator->GetTextureForwarder(), aFormat, aSize, aMoz2DBackend, + aAllocator->GetCompositorBackendType(), aTextureFlags, aAllocFlags); +} + +// static +already_AddRefed<TextureClient> TextureClient::CreateForRawBufferAccess( + LayersIPCChannel* aAllocator, gfx::SurfaceFormat aFormat, + gfx::IntSize aSize, gfx::BackendType aMoz2DBackend, + LayersBackend aLayersBackend, TextureFlags aTextureFlags, + TextureAllocationFlags aAllocFlags) { + // also test the validity of aAllocator + if (!aAllocator || !aAllocator->IPCOpen()) { + return nullptr; + } + + if (!gfx::Factory::AllowedSurfaceSize(aSize)) { + return nullptr; + } + + if (aFormat == SurfaceFormat::B8G8R8X8) { + // Skia doesn't support RGBX, so ensure we clear the buffer for the proper + // alpha values. + aAllocFlags = TextureAllocationFlags(aAllocFlags | ALLOC_CLEAR_BUFFER); + } + + // Note that we ignore the backend type if we get here. It should only be D2D + // or Skia, and D2D does not support data surfaces. Therefore it is safe to + // force the buffer to be Skia. + NS_WARNING_ASSERTION(aMoz2DBackend == gfx::BackendType::SKIA || + aMoz2DBackend == gfx::BackendType::DIRECT2D || + aMoz2DBackend == gfx::BackendType::DIRECT2D1_1, + "Unsupported TextureClient backend type"); + + TextureData* texData = BufferTextureData::Create( + aSize, aFormat, gfx::BackendType::SKIA, aLayersBackend, aTextureFlags, + aAllocFlags, aAllocator); + if (!texData) { + return nullptr; + } + + return MakeAndAddRef<TextureClient>(texData, aTextureFlags, aAllocator); +} + +// static +already_AddRefed<TextureClient> TextureClient::CreateForYCbCr( + KnowsCompositor* aAllocator, const gfx::IntRect& aDisplay, + const gfx::IntSize& aYSize, uint32_t aYStride, + const gfx::IntSize& aCbCrSize, uint32_t aCbCrStride, StereoMode aStereoMode, + gfx::ColorDepth aColorDepth, gfx::YUVColorSpace aYUVColorSpace, + gfx::ColorRange aColorRange, gfx::ChromaSubsampling aSubsampling, + TextureFlags aTextureFlags) { + if (!aAllocator || !aAllocator->GetLayersIPCActor()->IPCOpen()) { + return nullptr; + } + + if (!gfx::Factory::AllowedSurfaceSize(aYSize)) { + return nullptr; + } + + TextureData* data = BufferTextureData::CreateForYCbCr( + aAllocator, aDisplay, aYSize, aYStride, aCbCrSize, aCbCrStride, + aStereoMode, aColorDepth, aYUVColorSpace, aColorRange, aSubsampling, + aTextureFlags); + if (!data) { + return nullptr; + } + + return MakeAndAddRef<TextureClient>(data, aTextureFlags, + aAllocator->GetTextureForwarder()); +} + +TextureClient::TextureClient(TextureData* aData, TextureFlags aFlags, + LayersIPCChannel* aAllocator) + : AtomicRefCountedWithFinalize("TextureClient"), + mAllocator(aAllocator), + mActor(nullptr), + mData(aData), + mFlags(aFlags), + mOpenMode(OpenMode::OPEN_NONE) +#ifdef DEBUG + , + mExpectedDtRefs(0) +#endif + , + mIsLocked(false), + mIsReadLocked(false), + mUpdated(false), + mAddedToCompositableClient(false), + mFwdTransactionId(0), + mSerial(++sSerialCounter) +#ifdef GFX_DEBUG_TRACK_CLIENTS_IN_POOL + , + mPoolTracker(nullptr) +#endif +{ + mData->FillInfo(mInfo); + mFlags |= mData->GetTextureFlags(); + + if (mFlags & TextureFlags::NON_BLOCKING_READ_LOCK) { + MOZ_ASSERT(!(mFlags & TextureFlags::BLOCKING_READ_LOCK)); + EnableReadLock(); + } else if (mFlags & TextureFlags::BLOCKING_READ_LOCK) { + MOZ_ASSERT(!(mFlags & TextureFlags::NON_BLOCKING_READ_LOCK)); + EnableBlockingReadLock(); + } +} + +bool TextureClient::CopyToTextureClient(TextureClient* aTarget, + const gfx::IntRect* aRect, + const gfx::IntPoint* aPoint) { + MOZ_ASSERT(IsLocked()); + MOZ_ASSERT(aTarget->IsLocked()); + + if (!aTarget->CanExposeDrawTarget() || !CanExposeDrawTarget()) { + return false; + } + + RefPtr<DrawTarget> destinationTarget = aTarget->BorrowDrawTarget(); + if (!destinationTarget) { + gfxWarning() << "TextureClient::CopyToTextureClient (dest) failed in " + "BorrowDrawTarget"; + return false; + } + + RefPtr<DrawTarget> sourceTarget = BorrowDrawTarget(); + if (!sourceTarget) { + gfxWarning() << "TextureClient::CopyToTextureClient (src) failed in " + "BorrowDrawTarget"; + return false; + } + + RefPtr<gfx::SourceSurface> source = sourceTarget->Snapshot(); + destinationTarget->CopySurface( + source, aRect ? *aRect : gfx::IntRect(gfx::IntPoint(0, 0), GetSize()), + aPoint ? *aPoint : gfx::IntPoint(0, 0)); + return true; +} + +already_AddRefed<gfx::DataSourceSurface> TextureClient::GetAsSurface() { + if (!Lock(OpenMode::OPEN_READ)) { + return nullptr; + } + RefPtr<gfx::DataSourceSurface> data; + { // scope so that the DrawTarget is destroyed before Unlock() + RefPtr<gfx::DrawTarget> dt = BorrowDrawTarget(); + if (dt) { + RefPtr<gfx::SourceSurface> surf = dt->Snapshot(); + if (surf) { + data = surf->GetDataSurface(); + } + } + } + Unlock(); + return data.forget(); +} + +void TextureClient::GetSurfaceDescriptorRemoteDecoder( + SurfaceDescriptorRemoteDecoder* const aOutDesc) { + const auto handle = GetSerial(); + + RemoteDecoderVideoSubDescriptor subDesc = null_t(); + MOZ_RELEASE_ASSERT(mData); + mData->GetSubDescriptor(&subDesc); + + *aOutDesc = + SurfaceDescriptorRemoteDecoder(handle, std::move(subDesc), Nothing()); +} + +class MemoryTextureReadLock : public NonBlockingTextureReadLock { + public: + MemoryTextureReadLock(); + + virtual ~MemoryTextureReadLock(); + + bool ReadLock() override; + + int32_t ReadUnlock() override; + + int32_t GetReadCount() override; + + LockType GetType() override { return TYPE_NONBLOCKING_MEMORY; } + + bool IsValid() const override { return true; }; + + bool Serialize(ReadLockDescriptor& aOutput, base::ProcessId aOther) override; + + Atomic<int32_t> mReadCount; +}; + +// The cross-prcess implementation of TextureReadLock. +// +// Since we don't use cross-process reference counting for the ReadLock objects, +// we use the lock's internal counter as a way to know when to deallocate the +// underlying shmem section: when the counter is equal to 1, it means that the +// lock is not "held" (the texture is writable), when the counter is equal to 0 +// it means that we can safely deallocate the shmem section without causing a +// race condition with the other process. +class ShmemTextureReadLock : public NonBlockingTextureReadLock { + public: + struct ShmReadLockInfo { + int32_t readCount; + }; + + explicit ShmemTextureReadLock(LayersIPCChannel* aAllocator); + + virtual ~ShmemTextureReadLock(); + + bool ReadLock() override; + + int32_t ReadUnlock() override; + + int32_t GetReadCount() override; + + bool IsValid() const override { return mAllocSuccess; }; + + LockType GetType() override { return TYPE_NONBLOCKING_SHMEM; } + + bool Serialize(ReadLockDescriptor& aOutput, base::ProcessId aOther) override; + + mozilla::layers::ShmemSection& GetShmemSection() { return mShmemSection; } + + explicit ShmemTextureReadLock( + const mozilla::layers::ShmemSection& aShmemSection) + : mShmemSection(aShmemSection), mAllocSuccess(true) { + MOZ_COUNT_CTOR(ShmemTextureReadLock); + } + + ShmReadLockInfo* GetShmReadLockInfoPtr() { + return reinterpret_cast<ShmReadLockInfo*>( + mShmemSection.shmem().get<char>() + mShmemSection.offset()); + } + + RefPtr<LayersIPCChannel> mClientAllocator; + mozilla::layers::ShmemSection mShmemSection; + bool mAllocSuccess; +}; + +class CrossProcessSemaphoreReadLock : public TextureReadLock { + public: + CrossProcessSemaphoreReadLock() + : mSemaphore(CrossProcessSemaphore::Create("TextureReadLock", 1)), + mShared(false) {} + explicit CrossProcessSemaphoreReadLock(CrossProcessSemaphoreHandle aHandle) + : mSemaphore(CrossProcessSemaphore::Create(std::move(aHandle))), + mShared(false) {} + + bool ReadLock() override { + if (!IsValid()) { + return false; + } + return mSemaphore->Wait(); + } + bool TryReadLock(TimeDuration aTimeout) override { + if (!IsValid()) { + return false; + } + return mSemaphore->Wait(Some(aTimeout)); + } + int32_t ReadUnlock() override { + if (!IsValid()) { + return 1; + } + mSemaphore->Signal(); + return 1; + } + bool IsValid() const override { return !!mSemaphore; } + + bool Serialize(ReadLockDescriptor& aOutput, base::ProcessId aOther) override; + + LockType GetType() override { return TYPE_CROSS_PROCESS_SEMAPHORE; } + + UniquePtr<CrossProcessSemaphore> mSemaphore; + bool mShared; +}; + +// static +already_AddRefed<TextureReadLock> TextureReadLock::Deserialize( + ReadLockDescriptor&& aDescriptor, ISurfaceAllocator* aAllocator) { + switch (aDescriptor.type()) { + case ReadLockDescriptor::TShmemSection: { + const ShmemSection& section = aDescriptor.get_ShmemSection(); + MOZ_RELEASE_ASSERT(section.shmem().IsReadable()); + return MakeAndAddRef<ShmemTextureReadLock>(section); + } + case ReadLockDescriptor::Tuintptr_t: { + if (!aAllocator->IsSameProcess()) { + // Trying to use a memory based lock instead of a shmem based one in + // the cross-process case is a bad security violation. + NS_ERROR( + "A client process may be trying to peek at the host's address " + "space!"); + return nullptr; + } + RefPtr<TextureReadLock> lock = + reinterpret_cast<MemoryTextureReadLock*>(aDescriptor.get_uintptr_t()); + + MOZ_ASSERT(lock); + if (lock) { + // The corresponding AddRef is in MemoryTextureReadLock::Serialize + lock.get()->Release(); + } + + return lock.forget(); + } + case ReadLockDescriptor::TCrossProcessSemaphoreDescriptor: { + return MakeAndAddRef<CrossProcessSemaphoreReadLock>( + std::move(aDescriptor.get_CrossProcessSemaphoreDescriptor().sem())); + } + case ReadLockDescriptor::Tnull_t: { + return nullptr; + } + default: { + // Invalid descriptor. + MOZ_DIAGNOSTIC_ASSERT(false); + } + } + return nullptr; +} +// static +already_AddRefed<TextureReadLock> NonBlockingTextureReadLock::Create( + LayersIPCChannel* aAllocator) { + if (aAllocator->IsSameProcess()) { + // If our compositor is in the same process, we can save some cycles by not + // using shared memory. + return MakeAndAddRef<MemoryTextureReadLock>(); + } + + return MakeAndAddRef<ShmemTextureReadLock>(aAllocator); +} + +MemoryTextureReadLock::MemoryTextureReadLock() : mReadCount(1) { + MOZ_COUNT_CTOR(MemoryTextureReadLock); +} + +MemoryTextureReadLock::~MemoryTextureReadLock() { + // One read count that is added in constructor. + MOZ_ASSERT(mReadCount == 1); + MOZ_COUNT_DTOR(MemoryTextureReadLock); +} + +bool MemoryTextureReadLock::Serialize(ReadLockDescriptor& aOutput, + base::ProcessId aOther) { + // AddRef here and Release when receiving on the host side to make sure the + // reference count doesn't go to zero before the host receives the message. + // see TextureReadLock::Deserialize + this->AddRef(); + aOutput = ReadLockDescriptor(uintptr_t(this)); + return true; +} + +bool MemoryTextureReadLock::ReadLock() { + NS_ASSERT_OWNINGTHREAD(MemoryTextureReadLock); + + ++mReadCount; + return true; +} + +int32_t MemoryTextureReadLock::ReadUnlock() { + int32_t readCount = --mReadCount; + MOZ_ASSERT(readCount >= 0); + + return readCount; +} + +int32_t MemoryTextureReadLock::GetReadCount() { + NS_ASSERT_OWNINGTHREAD(MemoryTextureReadLock); + return mReadCount; +} + +ShmemTextureReadLock::ShmemTextureReadLock(LayersIPCChannel* aAllocator) + : mClientAllocator(aAllocator), mAllocSuccess(false) { + MOZ_COUNT_CTOR(ShmemTextureReadLock); + MOZ_ASSERT(mClientAllocator); + MOZ_ASSERT(mClientAllocator->GetTileLockAllocator()); +#define MOZ_ALIGN_WORD(x) (((x) + 3) & ~3) + if (mClientAllocator->GetTileLockAllocator()->AllocShmemSection( + MOZ_ALIGN_WORD(sizeof(ShmReadLockInfo)), &mShmemSection)) { + ShmReadLockInfo* info = GetShmReadLockInfoPtr(); + info->readCount = 1; + mAllocSuccess = true; + } +} + +ShmemTextureReadLock::~ShmemTextureReadLock() { + if (mClientAllocator) { + // Release one read count that is added in constructor. + // The count is kept for calling GetReadCount() by TextureClientPool. + ReadUnlock(); + } + MOZ_COUNT_DTOR(ShmemTextureReadLock); +} + +bool ShmemTextureReadLock::Serialize(ReadLockDescriptor& aOutput, + base::ProcessId aOther) { + aOutput = ReadLockDescriptor(GetShmemSection()); + return true; +} + +bool ShmemTextureReadLock::ReadLock() { + NS_ASSERT_OWNINGTHREAD(ShmemTextureReadLock); + if (!mAllocSuccess) { + return false; + } + ShmReadLockInfo* info = GetShmReadLockInfoPtr(); + PR_ATOMIC_INCREMENT(&info->readCount); + return true; +} + +int32_t ShmemTextureReadLock::ReadUnlock() { + if (!mAllocSuccess) { + return 0; + } + ShmReadLockInfo* info = GetShmReadLockInfoPtr(); + int32_t readCount = PR_ATOMIC_DECREMENT(&info->readCount); + MOZ_ASSERT(readCount >= 0); + if (readCount <= 0) { + if (mClientAllocator && mClientAllocator->GetTileLockAllocator()) { + mClientAllocator->GetTileLockAllocator()->DeallocShmemSection( + mShmemSection); + } else { + // we are on the compositor process, or IPC is down. + FixedSizeSmallShmemSectionAllocator::FreeShmemSection(mShmemSection); + } + } + return readCount; +} + +int32_t ShmemTextureReadLock::GetReadCount() { + NS_ASSERT_OWNINGTHREAD(ShmemTextureReadLock); + if (!mAllocSuccess) { + return 0; + } + ShmReadLockInfo* info = GetShmReadLockInfoPtr(); + return info->readCount; +} + +bool CrossProcessSemaphoreReadLock::Serialize(ReadLockDescriptor& aOutput, + base::ProcessId aOther) { + if (!mShared && IsValid()) { + aOutput = ReadLockDescriptor( + CrossProcessSemaphoreDescriptor(mSemaphore->CloneHandle())); + mSemaphore->CloseHandle(); + mShared = true; + return true; + } else { + return mShared; + } +} + +void TextureClient::EnableBlockingReadLock() { + if (!mReadLock) { + mReadLock = new CrossProcessSemaphoreReadLock(); + } +} + +bool UpdateYCbCrTextureClient(TextureClient* aTexture, + const PlanarYCbCrData& aData) { + MOZ_ASSERT(aTexture); + MOZ_ASSERT(aTexture->IsLocked()); + MOZ_ASSERT(aTexture->GetFormat() == gfx::SurfaceFormat::YUV, + "This textureClient can only use YCbCr data"); + MOZ_ASSERT(!aTexture->IsImmutable()); + MOZ_ASSERT(aTexture->IsValid()); + MOZ_ASSERT(aData.mCbSkip == aData.mCrSkip); + + MappedYCbCrTextureData mapped; + if (!aTexture->BorrowMappedYCbCrData(mapped)) { + NS_WARNING("Failed to extract YCbCr info!"); + return false; + } + + uint32_t bytesPerPixel = + BytesPerPixel(SurfaceFormatForColorDepth(aData.mColorDepth)); + MappedYCbCrTextureData srcData; + srcData.y.data = aData.mYChannel; + srcData.y.size = aData.YDataSize(); + srcData.y.stride = aData.mYStride; + srcData.y.skip = aData.mYSkip; + srcData.y.bytesPerPixel = bytesPerPixel; + srcData.cb.data = aData.mCbChannel; + srcData.cb.size = aData.CbCrDataSize(); + srcData.cb.stride = aData.mCbCrStride; + srcData.cb.skip = aData.mCbSkip; + srcData.cb.bytesPerPixel = bytesPerPixel; + srcData.cr.data = aData.mCrChannel; + srcData.cr.size = aData.CbCrDataSize(); + srcData.cr.stride = aData.mCbCrStride; + srcData.cr.skip = aData.mCrSkip; + srcData.cr.bytesPerPixel = bytesPerPixel; + srcData.metadata = nullptr; + + if (!srcData.CopyInto(mapped)) { + NS_WARNING("Failed to copy image data!"); + return false; + } + + if (TextureRequiresLocking(aTexture->GetFlags())) { + // We don't have support for proper locking yet, so we'll + // have to be immutable instead. + aTexture->MarkImmutable(); + } + return true; +} + +already_AddRefed<TextureClient> TextureClient::CreateWithData( + TextureData* aData, TextureFlags aFlags, LayersIPCChannel* aAllocator) { + if (!aData) { + return nullptr; + } + return MakeAndAddRef<TextureClient>(aData, aFlags, aAllocator); +} + +template <class PixelDataType> +static void copyData(PixelDataType* aDst, + const MappedYCbCrChannelData& aChannelDst, + PixelDataType* aSrc, + const MappedYCbCrChannelData& aChannelSrc) { + uint8_t* srcByte = reinterpret_cast<uint8_t*>(aSrc); + const int32_t srcSkip = aChannelSrc.skip + 1; + uint8_t* dstByte = reinterpret_cast<uint8_t*>(aDst); + const int32_t dstSkip = aChannelDst.skip + 1; + for (int32_t i = 0; i < aChannelSrc.size.height; ++i) { + for (int32_t j = 0; j < aChannelSrc.size.width; ++j) { + *aDst = *aSrc; + aSrc += srcSkip; + aDst += dstSkip; + } + srcByte += aChannelSrc.stride; + aSrc = reinterpret_cast<PixelDataType*>(srcByte); + dstByte += aChannelDst.stride; + aDst = reinterpret_cast<PixelDataType*>(dstByte); + } +} + +bool MappedYCbCrChannelData::CopyInto(MappedYCbCrChannelData& aDst) { + if (!data || !aDst.data || size != aDst.size) { + return false; + } + + if (stride == aDst.stride && skip == aDst.skip) { + // fast path! + // We assume that the padding in the destination is there for alignment + // purposes and doesn't contain useful data. + memcpy(aDst.data, data, stride * size.height); + return true; + } + + if (aDst.skip == 0 && skip == 0) { + // fast-ish path + for (int32_t i = 0; i < size.height; ++i) { + memcpy(aDst.data + i * aDst.stride, data + i * stride, + size.width * bytesPerPixel); + } + return true; + } + + MOZ_ASSERT(bytesPerPixel == 1 || bytesPerPixel == 2); + // slow path + if (bytesPerPixel == 1) { + copyData(aDst.data, aDst, data, *this); + } else if (bytesPerPixel == 2) { + copyData(reinterpret_cast<uint16_t*>(aDst.data), aDst, + reinterpret_cast<uint16_t*>(data), *this); + } + return true; +} + +} // namespace mozilla::layers |