diff -r 000000000000 -r 6474c204b198 gfx/layers/ipc/ShadowLayers.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/layers/ipc/ShadowLayers.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,704 @@
+/* -*- 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/. */
+
+#include "ShadowLayers.h"
+#include <set>                          // for _Rb_tree_const_iterator, etc
+#include <vector>                       // for vector
+#include "GeckoProfiler.h"              // for PROFILER_LABEL
+#include "ISurfaceAllocator.h"          // for IsSurfaceDescriptorValid
+#include "Layers.h"                     // for Layer
+#include "RenderTrace.h"                // for RenderTraceScope
+#include "ShadowLayerChild.h"           // for ShadowLayerChild
+#include "gfx2DGlue.h"                  // for Moz2D transition helpers
+#include "gfxPlatform.h"                // for gfxImageFormat, gfxPlatform
+#include "gfxSharedImageSurface.h"      // for gfxSharedImageSurface
+#include "ipc/IPCMessageUtils.h"        // for gfxContentType, null_t
+#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
+#include "mozilla/gfx/Point.h"          // for IntSize
+#include "mozilla/layers/CompositableClient.h"  // for CompositableClient, etc
+#include "mozilla/layers/LayersMessages.h"  // for Edit, etc
+#include "mozilla/layers/LayersSurfaces.h"  // for SurfaceDescriptor, etc
+#include "mozilla/layers/LayersTypes.h"  // for MOZ_LAYERS_LOG
+#include "mozilla/layers/LayerTransactionChild.h"
+#include "ShadowLayerUtils.h"
+#include "mozilla/layers/TextureClient.h"  // for TextureClient
+#include "mozilla/mozalloc.h"           // for operator new, etc
+#include "nsAutoPtr.h"                  // for nsRefPtr, getter_AddRefs, etc
+#include "nsDebug.h"                    // for NS_ABORT_IF_FALSE, etc
+#include "nsRect.h"                     // for nsIntRect
+#include "nsSize.h"                     // for nsIntSize
+#include "nsTArray.h"                   // for nsAutoTArray, nsTArray, etc
+#include "nsXULAppAPI.h"                // for XRE_GetProcessType, etc
+
+struct nsIntPoint;
+
+using namespace mozilla::ipc;
+using namespace mozilla::gl;
+using namespace mozilla::dom;
+
+namespace mozilla {
+namespace ipc {
+class Shmem;
+}
+
+namespace layers {
+
+class ClientTiledLayerBuffer;
+
+typedef nsTArray<SurfaceDescriptor> BufferArray;
+typedef std::vector<Edit> EditVector;
+typedef std::set<ShadowableLayer*> ShadowableLayerSet;
+
+class Transaction
+{
+public:
+  Transaction()
+    : mTargetRotation(ROTATION_0)
+    , mSwapRequired(false)
+    , mOpen(false)
+    , mRotationChanged(false)
+  {}
+
+  void Begin(const nsIntRect& aTargetBounds, ScreenRotation aRotation,
+             const nsIntRect& aClientBounds, ScreenOrientation aOrientation)
+  {
+    mOpen = true;
+    mTargetBounds = aTargetBounds;
+    if (aRotation != mTargetRotation) {
+      // the first time this is called, mRotationChanged will be false if
+      // aRotation is 0, but we should be OK because for the first transaction
+      // we should only compose if it is non-empty. See the caller(s) of
+      // RotationChanged.
+      mRotationChanged = true;
+    }
+    mTargetRotation = aRotation;
+    mClientBounds = aClientBounds;
+    mTargetOrientation = aOrientation;
+  }
+  void MarkSyncTransaction()
+  {
+    mSwapRequired = true;
+  }
+  void AddEdit(const Edit& aEdit)
+  {
+    NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
+    mCset.push_back(aEdit);
+  }
+  void AddEdit(const CompositableOperation& aEdit)
+  {
+    AddEdit(Edit(aEdit));
+  }
+  void AddPaint(const Edit& aPaint)
+  {
+    AddNoSwapPaint(aPaint);
+    mSwapRequired = true;
+  }
+  void AddPaint(const CompositableOperation& aPaint)
+  {
+    AddNoSwapPaint(Edit(aPaint));
+    mSwapRequired = true;
+  }
+
+  void AddNoSwapPaint(const Edit& aPaint)
+  {
+    NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
+    mPaints.push_back(aPaint);
+  }
+  void AddNoSwapPaint(const CompositableOperation& aPaint)
+  {
+    NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
+    mPaints.push_back(Edit(aPaint));
+  }
+  void AddMutant(ShadowableLayer* aLayer)
+  {
+    NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
+    mMutants.insert(aLayer);
+  }
+  void End()
+  {
+    mCset.clear();
+    mPaints.clear();
+    mMutants.clear();
+    mOpen = false;
+    mSwapRequired = false;
+    mRotationChanged = false;
+  }
+
+  bool Empty() const {
+    return mCset.empty() && mPaints.empty() && mMutants.empty();
+  }
+  bool RotationChanged() const {
+    return mRotationChanged;
+  }
+  bool Finished() const { return !mOpen && Empty(); }
+
+  EditVector mCset;
+  EditVector mPaints;
+  ShadowableLayerSet mMutants;
+  nsIntRect mTargetBounds;
+  ScreenRotation mTargetRotation;
+  nsIntRect mClientBounds;
+  ScreenOrientation mTargetOrientation;
+  bool mSwapRequired;
+
+private:
+  bool mOpen;
+  bool mRotationChanged;
+
+  // disabled
+  Transaction(const Transaction&);
+  Transaction& operator=(const Transaction&);
+};
+struct AutoTxnEnd {
+  AutoTxnEnd(Transaction* aTxn) : mTxn(aTxn) {}
+  ~AutoTxnEnd() { mTxn->End(); }
+  Transaction* mTxn;
+};
+
+void
+CompositableForwarder::IdentifyTextureHost(const TextureFactoryIdentifier& aIdentifier)
+{
+  mTextureFactoryIdentifier = aIdentifier;
+}
+
+ShadowLayerForwarder::ShadowLayerForwarder()
+ : mDiagnosticTypes(DIAGNOSTIC_NONE)
+ , mIsFirstPaint(false)
+ , mWindowOverlayChanged(false)
+{
+  mTxn = new Transaction();
+}
+
+ShadowLayerForwarder::~ShadowLayerForwarder()
+{
+  NS_ABORT_IF_FALSE(mTxn->Finished(), "unfinished transaction?");
+  delete mTxn;
+}
+
+void
+ShadowLayerForwarder::BeginTransaction(const nsIntRect& aTargetBounds,
+                                       ScreenRotation aRotation,
+                                       const nsIntRect& aClientBounds,
+                                       ScreenOrientation aOrientation)
+{
+  NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
+  NS_ABORT_IF_FALSE(mTxn->Finished(), "uncommitted txn?");
+  mTxn->Begin(aTargetBounds, aRotation, aClientBounds, aOrientation);
+}
+
+static PLayerChild*
+Shadow(ShadowableLayer* aLayer)
+{
+  return aLayer->GetShadow();
+}
+
+template<typename OpCreateT>
+static void
+CreatedLayer(Transaction* aTxn, ShadowableLayer* aLayer)
+{
+  aTxn->AddEdit(OpCreateT(nullptr, Shadow(aLayer)));
+}
+
+void
+ShadowLayerForwarder::CreatedThebesLayer(ShadowableLayer* aThebes)
+{
+  CreatedLayer<OpCreateThebesLayer>(mTxn, aThebes);
+}
+void
+ShadowLayerForwarder::CreatedContainerLayer(ShadowableLayer* aContainer)
+{
+  CreatedLayer<OpCreateContainerLayer>(mTxn, aContainer);
+}
+void
+ShadowLayerForwarder::CreatedImageLayer(ShadowableLayer* aImage)
+{
+  CreatedLayer<OpCreateImageLayer>(mTxn, aImage);
+}
+void
+ShadowLayerForwarder::CreatedColorLayer(ShadowableLayer* aColor)
+{
+  CreatedLayer<OpCreateColorLayer>(mTxn, aColor);
+}
+void
+ShadowLayerForwarder::CreatedCanvasLayer(ShadowableLayer* aCanvas)
+{
+  CreatedLayer<OpCreateCanvasLayer>(mTxn, aCanvas);
+}
+void
+ShadowLayerForwarder::CreatedRefLayer(ShadowableLayer* aRef)
+{
+  CreatedLayer<OpCreateRefLayer>(mTxn, aRef);
+}
+
+void
+ShadowLayerForwarder::Mutated(ShadowableLayer* aMutant)
+{
+mTxn->AddMutant(aMutant);
+}
+
+void
+ShadowLayerForwarder::SetRoot(ShadowableLayer* aRoot)
+{
+  mTxn->AddEdit(OpSetRoot(nullptr, Shadow(aRoot)));
+}
+void
+ShadowLayerForwarder::InsertAfter(ShadowableLayer* aContainer,
+                                  ShadowableLayer* aChild,
+                                  ShadowableLayer* aAfter)
+{
+  if (aAfter)
+    mTxn->AddEdit(OpInsertAfter(nullptr, Shadow(aContainer),
+                                nullptr, Shadow(aChild),
+                                nullptr, Shadow(aAfter)));
+  else
+    mTxn->AddEdit(OpPrependChild(nullptr, Shadow(aContainer),
+                                 nullptr, Shadow(aChild)));
+}
+void
+ShadowLayerForwarder::RemoveChild(ShadowableLayer* aContainer,
+                                  ShadowableLayer* aChild)
+{
+  MOZ_LAYERS_LOG(("[LayersForwarder] OpRemoveChild container=%p child=%p\n",
+                  aContainer->AsLayer(), aChild->AsLayer()));
+
+  mTxn->AddEdit(OpRemoveChild(nullptr, Shadow(aContainer),
+                              nullptr, Shadow(aChild)));
+}
+void
+ShadowLayerForwarder::RepositionChild(ShadowableLayer* aContainer,
+                                      ShadowableLayer* aChild,
+                                      ShadowableLayer* aAfter)
+{
+  if (aAfter) {
+    MOZ_LAYERS_LOG(("[LayersForwarder] OpRepositionChild container=%p child=%p after=%p",
+                   aContainer->AsLayer(), aChild->AsLayer(), aAfter->AsLayer()));
+    mTxn->AddEdit(OpRepositionChild(nullptr, Shadow(aContainer),
+                                    nullptr, Shadow(aChild),
+                                    nullptr, Shadow(aAfter)));
+  } else {
+    MOZ_LAYERS_LOG(("[LayersForwarder] OpRaiseToTopChild container=%p child=%p",
+                   aContainer->AsLayer(), aChild->AsLayer()));
+    mTxn->AddEdit(OpRaiseToTopChild(nullptr, Shadow(aContainer),
+                                    nullptr, Shadow(aChild)));
+  }
+}
+
+
+#ifdef DEBUG
+void
+ShadowLayerForwarder::CheckSurfaceDescriptor(const SurfaceDescriptor* aDescriptor) const
+{
+  if (!aDescriptor) {
+    return;
+  }
+
+  if (aDescriptor->type() == SurfaceDescriptor::TSurfaceDescriptorShmem) {
+    const SurfaceDescriptorShmem& shmem = aDescriptor->get_SurfaceDescriptorShmem();
+    shmem.data().AssertInvariants();
+    MOZ_ASSERT(mShadowManager &&
+               mShadowManager->IsTrackingSharedMemory(shmem.data().mSegment));
+  }
+}
+#endif
+
+void
+ShadowLayerForwarder::UseTiledLayerBuffer(CompositableClient* aCompositable,
+                                          const SurfaceDescriptorTiles& aTileLayerDescriptor)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  mTxn->AddNoSwapPaint(OpUseTiledLayerBuffer(nullptr, aCompositable->GetIPDLActor(),
+                                             aTileLayerDescriptor));
+}
+
+void
+ShadowLayerForwarder::UpdateTextureRegion(CompositableClient* aCompositable,
+                                          const ThebesBufferData& aThebesBufferData,
+                                          const nsIntRegion& aUpdatedRegion)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  mTxn->AddPaint(OpPaintTextureRegion(nullptr, aCompositable->GetIPDLActor(),
+                                      aThebesBufferData,
+                                      aUpdatedRegion));
+}
+
+void
+ShadowLayerForwarder::UpdateTextureIncremental(CompositableClient* aCompositable,
+                                               TextureIdentifier aTextureId,
+                                               SurfaceDescriptor& aDescriptor,
+                                               const nsIntRegion& aUpdatedRegion,
+                                               const nsIntRect& aBufferRect,
+                                               const nsIntPoint& aBufferRotation)
+{
+  CheckSurfaceDescriptor(&aDescriptor);
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  mTxn->AddNoSwapPaint(OpPaintTextureIncremental(nullptr, aCompositable->GetIPDLActor(),
+                                                 aTextureId,
+                                                 aDescriptor,
+                                                 aUpdatedRegion,
+                                                 aBufferRect,
+                                                 aBufferRotation));
+}
+
+
+void
+ShadowLayerForwarder::UpdatePictureRect(CompositableClient* aCompositable,
+                                        const nsIntRect& aRect)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  mTxn->AddNoSwapPaint(OpUpdatePictureRect(nullptr, aCompositable->GetIPDLActor(), aRect));
+}
+
+void
+ShadowLayerForwarder::UpdatedTexture(CompositableClient* aCompositable,
+                                     TextureClient* aTexture,
+                                     nsIntRegion* aRegion)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aTexture);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  MOZ_ASSERT(aTexture->GetIPDLActor());
+  MaybeRegion region = aRegion ? MaybeRegion(*aRegion)
+                               : MaybeRegion(null_t());
+  if (aTexture->GetFlags() & TEXTURE_IMMEDIATE_UPLOAD) {
+    mTxn->AddPaint(OpUpdateTexture(nullptr, aCompositable->GetIPDLActor(),
+                                   nullptr, aTexture->GetIPDLActor(),
+                                   region));
+  } else {
+    mTxn->AddNoSwapPaint(OpUpdateTexture(nullptr, aCompositable->GetIPDLActor(),
+                                         nullptr, aTexture->GetIPDLActor(),
+                                         region));
+  }
+}
+
+void
+ShadowLayerForwarder::UseTexture(CompositableClient* aCompositable,
+                                 TextureClient* aTexture)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aTexture);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  MOZ_ASSERT(aTexture->GetIPDLActor());
+  mTxn->AddEdit(OpUseTexture(nullptr, aCompositable->GetIPDLActor(),
+                             nullptr, aTexture->GetIPDLActor()));
+}
+
+void
+ShadowLayerForwarder::UseComponentAlphaTextures(CompositableClient* aCompositable,
+                                                TextureClient* aTextureOnBlack,
+                                                TextureClient* aTextureOnWhite)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aTextureOnWhite);
+  MOZ_ASSERT(aTextureOnBlack);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  MOZ_ASSERT(aTextureOnBlack->GetIPDLActor());
+  MOZ_ASSERT(aTextureOnWhite->GetIPDLActor());
+  MOZ_ASSERT(aTextureOnBlack->GetSize() == aTextureOnWhite->GetSize());
+  mTxn->AddEdit(OpUseComponentAlphaTextures(nullptr, aCompositable->GetIPDLActor(),
+                                            nullptr, aTextureOnBlack->GetIPDLActor(),
+                                            nullptr, aTextureOnWhite->GetIPDLActor()));
+}
+
+void
+ShadowLayerForwarder::RemoveTextureFromCompositable(CompositableClient* aCompositable,
+                                                    TextureClient* aTexture)
+{
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aTexture);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  MOZ_ASSERT(aTexture->GetIPDLActor());
+  mTxn->AddEdit(OpRemoveTexture(nullptr, aCompositable->GetIPDLActor(),
+                                nullptr, aTexture->GetIPDLActor()));
+  if (aTexture->GetFlags() & TEXTURE_DEALLOCATE_CLIENT) {
+    mTxn->MarkSyncTransaction();
+  }
+  // Hold texture until transaction complete.
+  HoldUntilTransaction(aTexture);
+}
+
+void
+ShadowLayerForwarder::RemoveTexture(TextureClient* aTexture)
+{
+  MOZ_ASSERT(aTexture);
+  aTexture->ForceRemove();
+}
+
+bool
+ShadowLayerForwarder::EndTransaction(InfallibleTArray<EditReply>* aReplies,
+                                     const nsIntRegion& aRegionToClear,
+                                     bool aScheduleComposite,
+                                     bool* aSent)
+{
+  *aSent = false;
+
+  PROFILER_LABEL("ShadowLayerForwarder", "EndTranscation");
+  RenderTraceScope rendertrace("Foward Transaction", "000091");
+  NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
+  NS_ABORT_IF_FALSE(!mTxn->Finished(), "forgot BeginTransaction?");
+
+  DiagnosticTypes diagnostics = gfxPlatform::GetPlatform()->GetLayerDiagnosticTypes();
+  if (mDiagnosticTypes != diagnostics) {
+    mDiagnosticTypes = diagnostics;
+    mTxn->AddEdit(OpSetDiagnosticTypes(diagnostics));
+  }
+
+  AutoTxnEnd _(mTxn);
+
+  if (mTxn->Empty() && !mTxn->RotationChanged() && !mWindowOverlayChanged) {
+    MOZ_LAYERS_LOG(("[LayersForwarder] 0-length cset (?) and no rotation event, skipping Update()"));
+    return true;
+  }
+
+  MOZ_LAYERS_LOG(("[LayersForwarder] destroying buffers..."));
+
+  MOZ_LAYERS_LOG(("[LayersForwarder] building transaction..."));
+
+  // We purposely add attribute-change ops to the final changeset
+  // before we add paint ops.  This allows layers to record the
+  // attribute changes before new pixels arrive, which can be useful
+  // for setting up back/front buffers.
+  RenderTraceScope rendertrace2("Foward Transaction", "000092");
+  for (ShadowableLayerSet::const_iterator it = mTxn->mMutants.begin();
+       it != mTxn->mMutants.end(); ++it) {
+    ShadowableLayer* shadow = *it;
+    Layer* mutant = shadow->AsLayer();
+    NS_ABORT_IF_FALSE(!!mutant, "unshadowable layer?");
+
+    LayerAttributes attrs;
+    CommonLayerAttributes& common = attrs.common();
+    common.visibleRegion() = mutant->GetVisibleRegion();
+    common.eventRegions() = mutant->GetEventRegions();
+    common.postXScale() = mutant->GetPostXScale();
+    common.postYScale() = mutant->GetPostYScale();
+    common.transform() = mutant->GetBaseTransform();
+    common.contentFlags() = mutant->GetContentFlags();
+    common.opacity() = mutant->GetOpacity();
+    common.useClipRect() = !!mutant->GetClipRect();
+    common.clipRect() = (common.useClipRect() ?
+                         *mutant->GetClipRect() : nsIntRect());
+    common.isFixedPosition() = mutant->GetIsFixedPosition();
+    common.fixedPositionAnchor() = mutant->GetFixedPositionAnchor();
+    common.fixedPositionMargin() = mutant->GetFixedPositionMargins();
+    common.isStickyPosition() = mutant->GetIsStickyPosition();
+    if (mutant->GetIsStickyPosition()) {
+      common.stickyScrollContainerId() = mutant->GetStickyScrollContainerId();
+      common.stickyScrollRangeOuter() = mutant->GetStickyScrollRangeOuter();
+      common.stickyScrollRangeInner() = mutant->GetStickyScrollRangeInner();
+    }
+    common.scrollbarTargetContainerId() = mutant->GetScrollbarTargetContainerId();
+    common.scrollbarDirection() = mutant->GetScrollbarDirection();
+    if (Layer* maskLayer = mutant->GetMaskLayer()) {
+      common.maskLayerChild() = Shadow(maskLayer->AsShadowableLayer());
+    } else {
+      common.maskLayerChild() = nullptr;
+    }
+    common.maskLayerParent() = nullptr;
+    common.animations() = mutant->GetAnimations();
+    common.invalidRegion() = mutant->GetInvalidRegion();
+    attrs.specific() = null_t();
+    mutant->FillSpecificAttributes(attrs.specific());
+
+    MOZ_LAYERS_LOG(("[LayersForwarder] OpSetLayerAttributes(%p)\n", mutant));
+
+    mTxn->AddEdit(OpSetLayerAttributes(nullptr, Shadow(shadow), attrs));
+  }
+
+  AutoInfallibleTArray<Edit, 10> cset;
+  size_t nCsets = mTxn->mCset.size() + mTxn->mPaints.size();
+  NS_ABORT_IF_FALSE(nCsets > 0 || mWindowOverlayChanged, "should have bailed by now");
+
+  cset.SetCapacity(nCsets);
+  if (!mTxn->mCset.empty()) {
+    cset.AppendElements(&mTxn->mCset.front(), mTxn->mCset.size());
+  }
+  // Paints after non-paint ops, including attribute changes.  See
+  // above.
+  if (!mTxn->mPaints.empty()) {
+    cset.AppendElements(&mTxn->mPaints.front(), mTxn->mPaints.size());
+  }
+
+  mWindowOverlayChanged = false;
+
+  TargetConfig targetConfig(mTxn->mTargetBounds,
+                            mTxn->mTargetRotation,
+                            mTxn->mClientBounds,
+                            mTxn->mTargetOrientation,
+                            aRegionToClear);
+
+  MOZ_LAYERS_LOG(("[LayersForwarder] syncing before send..."));
+  PlatformSyncBeforeUpdate();
+
+  profiler_tracing("Paint", "Rasterize", TRACING_INTERVAL_END);
+  if (mTxn->mSwapRequired) {
+    MOZ_LAYERS_LOG(("[LayersForwarder] sending transaction..."));
+    RenderTraceScope rendertrace3("Forward Transaction", "000093");
+    if (!HasShadowManager() ||
+        !mShadowManager->IPCOpen() ||
+        !mShadowManager->SendUpdate(cset, targetConfig, mIsFirstPaint,
+                                    aScheduleComposite, aReplies)) {
+      MOZ_LAYERS_LOG(("[LayersForwarder] WARNING: sending transaction failed!"));
+      return false;
+    }
+  } else {
+    // If we don't require a swap we can call SendUpdateNoSwap which
+    // assumes that aReplies is empty (DEBUG assertion)
+    MOZ_LAYERS_LOG(("[LayersForwarder] sending no swap transaction..."));
+    RenderTraceScope rendertrace3("Forward NoSwap Transaction", "000093");
+    if (!HasShadowManager() ||
+        !mShadowManager->IPCOpen() ||
+        !mShadowManager->SendUpdateNoSwap(cset, targetConfig, mIsFirstPaint, aScheduleComposite)) {
+      MOZ_LAYERS_LOG(("[LayersForwarder] WARNING: sending transaction failed!"));
+      return false;
+    }
+  }
+
+  *aSent = true;
+  mIsFirstPaint = false;
+  MOZ_LAYERS_LOG(("[LayersForwarder] ... done"));
+  return true;
+}
+
+bool
+ShadowLayerForwarder::AllocShmem(size_t aSize,
+                                 ipc::SharedMemory::SharedMemoryType aType,
+                                 ipc::Shmem* aShmem)
+{
+  NS_ABORT_IF_FALSE(HasShadowManager(), "no shadow manager");
+  if (!mShadowManager->IPCOpen()) {
+    return false;
+  }
+  return mShadowManager->AllocShmem(aSize, aType, aShmem);
+}
+bool
+ShadowLayerForwarder::AllocUnsafeShmem(size_t aSize,
+                                          ipc::SharedMemory::SharedMemoryType aType,
+                                          ipc::Shmem* aShmem)
+{
+  NS_ABORT_IF_FALSE(HasShadowManager(), "no shadow manager");
+  if (!mShadowManager->IPCOpen()) {
+    return false;
+  }
+  return mShadowManager->AllocUnsafeShmem(aSize, aType, aShmem);
+}
+void
+ShadowLayerForwarder::DeallocShmem(ipc::Shmem& aShmem)
+{
+  NS_ABORT_IF_FALSE(HasShadowManager(), "no shadow manager");
+  if (!mShadowManager->IPCOpen()) {
+    return;
+  }
+  mShadowManager->DeallocShmem(aShmem);
+}
+
+bool
+ShadowLayerForwarder::IPCOpen() const
+{
+  return mShadowManager->IPCOpen();
+}
+
+bool
+ShadowLayerForwarder::IsSameProcess() const
+{
+  if (!mShadowManager->IPCOpen()) {
+    return false;
+  }
+  return mShadowManager->OtherProcess() == kInvalidProcessHandle;
+}
+
+/**
+  * We bail out when we have no shadow manager. That can happen when the
+  * layer manager is created by the preallocated process.
+  * See bug 914843 for details.
+  */
+PLayerChild*
+ShadowLayerForwarder::ConstructShadowFor(ShadowableLayer* aLayer)
+{
+  NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
+  if (!mShadowManager->IPCOpen()) {
+    return nullptr;
+  }
+  return mShadowManager->SendPLayerConstructor(new ShadowLayerChild(aLayer));
+}
+
+#if !defined(MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS)
+
+/*static*/ void
+ShadowLayerForwarder::PlatformSyncBeforeUpdate()
+{
+}
+
+#endif  // !defined(MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS)
+
+void
+ShadowLayerForwarder::Connect(CompositableClient* aCompositable)
+{
+#ifdef GFX_COMPOSITOR_LOGGING
+  printf("ShadowLayerForwarder::Connect(Compositable)\n");
+#endif
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(mShadowManager);
+  if (!mShadowManager->IPCOpen()) {
+    return;
+  }
+  PCompositableChild* actor =
+    mShadowManager->SendPCompositableConstructor(aCompositable->GetTextureInfo());
+  MOZ_ASSERT(actor);
+  aCompositable->InitIPDLActor(actor);
+}
+
+void
+ShadowLayerForwarder::CreatedIncrementalBuffer(CompositableClient* aCompositable,
+                                               const TextureInfo& aTextureInfo,
+                                               const nsIntRect& aBufferRect)
+{
+  MOZ_ASSERT(aCompositable);
+  mTxn->AddNoSwapPaint(OpCreatedIncrementalTexture(nullptr, aCompositable->GetIPDLActor(),
+                                                   aTextureInfo, aBufferRect));
+}
+
+void ShadowLayerForwarder::Attach(CompositableClient* aCompositable,
+                                  ShadowableLayer* aLayer)
+{
+  MOZ_ASSERT(aLayer);
+  MOZ_ASSERT(aCompositable);
+  MOZ_ASSERT(aCompositable->GetIPDLActor());
+  mTxn->AddEdit(OpAttachCompositable(nullptr, Shadow(aLayer),
+                                     nullptr, aCompositable->GetIPDLActor()));
+}
+
+void ShadowLayerForwarder::AttachAsyncCompositable(uint64_t aCompositableID,
+                                                   ShadowableLayer* aLayer)
+{
+  MOZ_ASSERT(aLayer);
+  MOZ_ASSERT(aCompositableID != 0); // zero is always an invalid compositable id.
+  mTxn->AddEdit(OpAttachAsyncCompositable(nullptr, Shadow(aLayer),
+                                          aCompositableID));
+}
+
+PTextureChild*
+ShadowLayerForwarder::CreateTexture(const SurfaceDescriptor& aSharedData,
+                                    TextureFlags aFlags)
+{
+  if (!mShadowManager->IPCOpen()) {
+    return nullptr;
+  }
+  return mShadowManager->SendPTextureConstructor(aSharedData, aFlags);
+}
+
+
+void ShadowLayerForwarder::SetShadowManager(PLayerTransactionChild* aShadowManager)
+{
+  mShadowManager = static_cast<LayerTransactionChild*>(aShadowManager);
+}
+
+
+} // namespace layers
+} // namespace mozilla