LCOV - code coverage report
Current view: directory - gfx/layers/ipc - ShadowLayers.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 224 0 0.0 %
Date: 2012-06-02 Functions: 51 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * vim: sw=2 ts=8 et :
       3                 :  */
       4                 : /* ***** BEGIN LICENSE BLOCK *****
       5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       6                 :  *
       7                 :  * The contents of this file are subject to the Mozilla Public License Version
       8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       9                 :  * the License. You may obtain a copy of the License at:
      10                 :  * http://www.mozilla.org/MPL/
      11                 :  *
      12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      14                 :  * for the specific language governing rights and limitations under the
      15                 :  * License.
      16                 :  *
      17                 :  * The Original Code is Mozilla Code.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  *   The Mozilla Foundation
      21                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *   Chris Jones <jones.chris.g@gmail.com>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      29                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : #include <set>
      42                 : #include <vector>
      43                 : 
      44                 : #include "gfxSharedImageSurface.h"
      45                 : 
      46                 : #include "mozilla/ipc/SharedMemorySysV.h"
      47                 : #include "mozilla/layers/PLayerChild.h"
      48                 : #include "mozilla/layers/PLayersChild.h"
      49                 : #include "mozilla/layers/PLayersParent.h"
      50                 : #include "ShadowLayers.h"
      51                 : #include "ShadowLayerChild.h"
      52                 : #include "gfxipc/ShadowLayerUtils.h"
      53                 : 
      54                 : using namespace mozilla::ipc;
      55                 : 
      56                 : namespace mozilla {
      57                 : namespace layers {
      58                 : 
      59                 : typedef nsTArray<SurfaceDescriptor> BufferArray; 
      60                 : typedef std::vector<Edit> EditVector;
      61                 : typedef std::set<ShadowableLayer*> ShadowableLayerSet;
      62                 : 
      63                 : class Transaction
      64               0 : {
      65                 : public:
      66               0 :   Transaction() : mOpen(false) {}
      67                 : 
      68               0 :   void Begin() { mOpen = true; }
      69                 : 
      70               0 :   void AddEdit(const Edit& aEdit)
      71                 :   {
      72               0 :     NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
      73               0 :     mCset.push_back(aEdit);
      74               0 :   }
      75               0 :   void AddPaint(const Edit& aPaint)
      76                 :   {
      77               0 :     NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
      78               0 :     mPaints.push_back(aPaint);
      79               0 :   }
      80               0 :   void AddMutant(ShadowableLayer* aLayer)
      81                 :   {
      82               0 :     NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
      83               0 :     mMutants.insert(aLayer);
      84               0 :   }
      85                 :   void AddBufferToDestroy(gfxSharedImageSurface* aBuffer)
      86                 :   {
      87                 :     return AddBufferToDestroy(aBuffer->GetShmem());
      88                 :   }
      89               0 :   void AddBufferToDestroy(const SurfaceDescriptor& aBuffer)
      90                 :   {
      91               0 :     NS_ABORT_IF_FALSE(!Finished(), "forgot BeginTransaction?");
      92               0 :     mDyingBuffers.AppendElement(aBuffer);
      93               0 :   }
      94                 : 
      95               0 :   void End()
      96                 :   {
      97               0 :     mCset.clear();
      98               0 :     mPaints.clear();
      99               0 :     mDyingBuffers.Clear();
     100               0 :     mMutants.clear();
     101               0 :     mOpen = false;
     102               0 :   }
     103                 : 
     104               0 :   bool Empty() const {
     105               0 :     return mCset.empty() && mPaints.empty() && mMutants.empty();
     106                 :   }
     107               0 :   bool Finished() const { return !mOpen && Empty(); }
     108                 : 
     109                 :   EditVector mCset;
     110                 :   EditVector mPaints;
     111                 :   BufferArray mDyingBuffers;
     112                 :   ShadowableLayerSet mMutants;
     113                 : 
     114                 : private:
     115                 :   bool mOpen;
     116                 : 
     117                 :   // disabled
     118                 :   Transaction(const Transaction&);
     119                 :   Transaction& operator=(const Transaction&);
     120                 : };
     121                 : struct AutoTxnEnd {
     122               0 :   AutoTxnEnd(Transaction* aTxn) : mTxn(aTxn) {}
     123               0 :   ~AutoTxnEnd() { mTxn->End(); }
     124                 :   Transaction* mTxn;
     125                 : };
     126                 : 
     127               0 : ShadowLayerForwarder::ShadowLayerForwarder()
     128                 :  : mShadowManager(NULL)
     129               0 :  , mParentBackend(LayerManager::LAYERS_NONE)
     130                 : {
     131               0 :   mTxn = new Transaction();
     132               0 : }
     133                 : 
     134               0 : ShadowLayerForwarder::~ShadowLayerForwarder()
     135                 : {
     136               0 :   NS_ABORT_IF_FALSE(mTxn->Finished(), "unfinished transaction?");
     137               0 :   delete mTxn;
     138               0 : }
     139                 : 
     140                 : void
     141               0 : ShadowLayerForwarder::BeginTransaction()
     142                 : {
     143               0 :   NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
     144               0 :   NS_ABORT_IF_FALSE(mTxn->Finished(), "uncommitted txn?");
     145               0 :   mTxn->Begin();
     146               0 : }
     147                 : 
     148                 : static PLayerChild*
     149               0 : Shadow(ShadowableLayer* aLayer)
     150                 : {
     151               0 :   return aLayer->GetShadow();
     152                 : }
     153                 : 
     154                 : template<typename OpCreateT>
     155                 : static void
     156               0 : CreatedLayer(Transaction* aTxn, ShadowableLayer* aLayer)
     157                 : {
     158               0 :   aTxn->AddEdit(OpCreateT(NULL, Shadow(aLayer)));
     159               0 : }
     160                 : 
     161                 : void
     162               0 : ShadowLayerForwarder::CreatedThebesLayer(ShadowableLayer* aThebes)
     163                 : {
     164               0 :   CreatedLayer<OpCreateThebesLayer>(mTxn, aThebes);
     165               0 : }
     166                 : void
     167               0 : ShadowLayerForwarder::CreatedContainerLayer(ShadowableLayer* aContainer)
     168                 : {
     169               0 :   CreatedLayer<OpCreateContainerLayer>(mTxn, aContainer);
     170               0 : }
     171                 : void
     172               0 : ShadowLayerForwarder::CreatedImageLayer(ShadowableLayer* aImage)
     173                 : {
     174               0 :   CreatedLayer<OpCreateImageLayer>(mTxn, aImage);
     175               0 : }
     176                 : void
     177               0 : ShadowLayerForwarder::CreatedColorLayer(ShadowableLayer* aColor)
     178                 : {
     179               0 :   CreatedLayer<OpCreateColorLayer>(mTxn, aColor);
     180               0 : }
     181                 : void
     182               0 : ShadowLayerForwarder::CreatedCanvasLayer(ShadowableLayer* aCanvas)
     183                 : {
     184               0 :   CreatedLayer<OpCreateCanvasLayer>(mTxn, aCanvas);
     185               0 : }
     186                 : 
     187                 : void
     188               0 : ShadowLayerForwarder::DestroyedThebesBuffer(ShadowableLayer* aThebes,
     189                 :                                             const SurfaceDescriptor& aBackBufferToDestroy)
     190                 : {
     191               0 :   mTxn->AddBufferToDestroy(aBackBufferToDestroy);
     192               0 : }
     193                 : 
     194                 : void
     195               0 : ShadowLayerForwarder::Mutated(ShadowableLayer* aMutant)
     196                 : {
     197               0 :   mTxn->AddMutant(aMutant);
     198               0 : }
     199                 : 
     200                 : void
     201               0 : ShadowLayerForwarder::SetRoot(ShadowableLayer* aRoot)
     202                 : {
     203               0 :   mTxn->AddEdit(OpSetRoot(NULL, Shadow(aRoot)));
     204               0 : }
     205                 : void
     206               0 : ShadowLayerForwarder::InsertAfter(ShadowableLayer* aContainer,
     207                 :                                   ShadowableLayer* aChild,
     208                 :                                   ShadowableLayer* aAfter)
     209                 : {
     210               0 :   if (aAfter)
     211                 :     mTxn->AddEdit(OpInsertAfter(NULL, Shadow(aContainer),
     212                 :                                 NULL, Shadow(aChild),
     213               0 :                                 NULL, Shadow(aAfter)));
     214                 :   else
     215                 :     mTxn->AddEdit(OpAppendChild(NULL, Shadow(aContainer),
     216               0 :                                 NULL, Shadow(aChild)));
     217               0 : }
     218                 : void
     219               0 : ShadowLayerForwarder::RemoveChild(ShadowableLayer* aContainer,
     220                 :                                   ShadowableLayer* aChild)
     221                 : {
     222                 :   mTxn->AddEdit(OpRemoveChild(NULL, Shadow(aContainer),
     223               0 :                               NULL, Shadow(aChild)));
     224               0 : }
     225                 : 
     226                 : void
     227               0 : ShadowLayerForwarder::PaintedThebesBuffer(ShadowableLayer* aThebes,
     228                 :                                           const nsIntRegion& aUpdatedRegion,
     229                 :                                           const nsIntRect& aBufferRect,
     230                 :                                           const nsIntPoint& aBufferRotation,
     231                 :                                           const SurfaceDescriptor& aNewFrontBuffer)
     232                 : {
     233                 :   mTxn->AddPaint(OpPaintThebesBuffer(NULL, Shadow(aThebes),
     234                 :                                      ThebesBuffer(aNewFrontBuffer,
     235                 :                                                   aBufferRect,
     236               0 :                                                   aBufferRotation),
     237               0 :                                      aUpdatedRegion));
     238               0 : }
     239                 : void
     240               0 : ShadowLayerForwarder::PaintedImage(ShadowableLayer* aImage,
     241                 :                                    const SharedImage& aNewFrontImage)
     242                 : {
     243                 :   mTxn->AddPaint(OpPaintImage(NULL, Shadow(aImage),
     244               0 :                               aNewFrontImage));
     245               0 : }
     246                 : void
     247               0 : ShadowLayerForwarder::PaintedCanvas(ShadowableLayer* aCanvas,
     248                 :                                     bool aNeedYFlip,
     249                 :                                     const SurfaceDescriptor& aNewFrontSurface)
     250                 : {
     251                 :   mTxn->AddPaint(OpPaintCanvas(NULL, Shadow(aCanvas),
     252                 :                                aNewFrontSurface,
     253               0 :                                aNeedYFlip));
     254               0 : }
     255                 : 
     256                 : bool
     257               0 : ShadowLayerForwarder::EndTransaction(InfallibleTArray<EditReply>* aReplies)
     258                 : {
     259               0 :   NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
     260               0 :   NS_ABORT_IF_FALSE(!mTxn->Finished(), "forgot BeginTransaction?");
     261                 : 
     262               0 :   AutoTxnEnd _(mTxn);
     263                 : 
     264               0 :   if (mTxn->Empty()) {
     265               0 :     MOZ_LAYERS_LOG(("[LayersForwarder] 0-length cset (?), skipping Update()"));
     266               0 :     return true;
     267                 :   }
     268                 : 
     269               0 :   MOZ_LAYERS_LOG(("[LayersForwarder] destroying buffers..."));
     270                 : 
     271               0 :   for (PRUint32 i = 0; i < mTxn->mDyingBuffers.Length(); ++i) {
     272               0 :     DestroySharedSurface(&mTxn->mDyingBuffers[i]);
     273                 :   }
     274                 : 
     275               0 :   MOZ_LAYERS_LOG(("[LayersForwarder] building transaction..."));
     276                 : 
     277                 :   // We purposely add attribute-change ops to the final changeset
     278                 :   // before we add paint ops.  This allows layers to record the
     279                 :   // attribute changes before new pixels arrive, which can be useful
     280                 :   // for setting up back/front buffers.
     281               0 :   for (ShadowableLayerSet::const_iterator it = mTxn->mMutants.begin();
     282               0 :        it != mTxn->mMutants.end(); ++it) {
     283               0 :     ShadowableLayer* shadow = *it;
     284               0 :     Layer* mutant = shadow->AsLayer();
     285               0 :     NS_ABORT_IF_FALSE(!!mutant, "unshadowable layer?");
     286                 : 
     287               0 :     LayerAttributes attrs;
     288               0 :     CommonLayerAttributes& common = attrs.common();
     289               0 :     common.visibleRegion() = mutant->GetVisibleRegion();
     290               0 :     common.transform() = mutant->GetTransform();
     291               0 :     common.contentFlags() = mutant->GetContentFlags();
     292               0 :     common.opacity() = mutant->GetOpacity();
     293               0 :     common.useClipRect() = !!mutant->GetClipRect();
     294               0 :     common.clipRect() = (common.useClipRect() ?
     295               0 :                          *mutant->GetClipRect() : nsIntRect());
     296               0 :     common.isFixedPosition() = mutant->GetIsFixedPosition();
     297               0 :     common.useTileSourceRect() = !!mutant->GetTileSourceRect();
     298               0 :     common.tileSourceRect() = (common.useTileSourceRect() ?
     299               0 :                                *mutant->GetTileSourceRect() : nsIntRect());
     300               0 :     attrs.specific() = null_t();
     301               0 :     mutant->FillSpecificAttributes(attrs.specific());
     302                 : 
     303               0 :     mTxn->AddEdit(OpSetLayerAttributes(NULL, Shadow(shadow), attrs));
     304                 :   }
     305                 : 
     306               0 :   AutoInfallibleTArray<Edit, 10> cset;
     307               0 :   size_t nCsets = mTxn->mCset.size() + mTxn->mPaints.size();
     308               0 :   NS_ABORT_IF_FALSE(nCsets > 0, "should have bailed by now");
     309                 : 
     310               0 :   cset.SetCapacity(nCsets);
     311               0 :   if (!mTxn->mCset.empty()) {
     312               0 :     cset.AppendElements(&mTxn->mCset.front(), mTxn->mCset.size());
     313                 :   }
     314                 :   // Paints after non-paint ops, including attribute changes.  See
     315                 :   // above.
     316               0 :   if (!mTxn->mPaints.empty()) {
     317               0 :     cset.AppendElements(&mTxn->mPaints.front(), mTxn->mPaints.size());
     318                 :   }
     319                 : 
     320               0 :   MOZ_LAYERS_LOG(("[LayersForwarder] syncing before send..."));
     321               0 :   PlatformSyncBeforeUpdate();
     322                 : 
     323               0 :   MOZ_LAYERS_LOG(("[LayersForwarder] sending transaction..."));
     324               0 :   if (!mShadowManager->SendUpdate(cset, aReplies)) {
     325               0 :     MOZ_LAYERS_LOG(("[LayersForwarder] WARNING: sending transaction failed!"));
     326               0 :     return false;
     327                 :   }
     328                 : 
     329               0 :   MOZ_LAYERS_LOG(("[LayersForwarder] ... done"));
     330               0 :   return true;
     331                 : }
     332                 : 
     333                 : static gfxASurface::gfxImageFormat
     334               0 : OptimalFormatFor(gfxASurface::gfxContentType aContent)
     335                 : {
     336               0 :   switch (aContent) {
     337                 :   case gfxASurface::CONTENT_COLOR:
     338                 : #ifdef MOZ_GFX_OPTIMIZE_MOBILE
     339                 :     return gfxASurface::ImageFormatRGB16_565;
     340                 : #else
     341               0 :     return gfxASurface::ImageFormatRGB24;
     342                 : #endif
     343                 :   case gfxASurface::CONTENT_ALPHA:
     344               0 :     return gfxASurface::ImageFormatA8;
     345                 :   case gfxASurface::CONTENT_COLOR_ALPHA:
     346               0 :     return gfxASurface::ImageFormatARGB32;
     347                 :   default:
     348               0 :     NS_NOTREACHED("unknown gfxContentType");
     349               0 :     return gfxASurface::ImageFormatARGB32;
     350                 :   }
     351                 : }
     352                 : 
     353                 : static SharedMemory::SharedMemoryType
     354               0 : OptimalShmemType()
     355                 : {
     356                 : #if defined(MOZ_PLATFORM_MAEMO) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)
     357                 :   // Use SysV memory because maemo5 on the N900 only allots 64MB to
     358                 :   // /dev/shm, even though it has 1GB(!!) of system memory.  Sys V shm
     359                 :   // is allocated from a different pool.  We don't want an arbitrary
     360                 :   // cap that's much much lower than available memory on the memory we
     361                 :   // use for layers.
     362                 :   return SharedMemory::TYPE_SYSV;
     363                 : #else
     364               0 :   return SharedMemory::TYPE_BASIC;
     365                 : #endif
     366                 : }
     367                 : 
     368                 : bool
     369               0 : ShadowLayerForwarder::AllocDoubleBuffer(const gfxIntSize& aSize,
     370                 :                                         gfxASurface::gfxContentType aContent,
     371                 :                                         gfxSharedImageSurface** aFrontBuffer,
     372                 :                                         gfxSharedImageSurface** aBackBuffer)
     373                 : {
     374               0 :   return AllocBuffer(aSize, aContent, aFrontBuffer) &&
     375               0 :          AllocBuffer(aSize, aContent, aBackBuffer);
     376                 : }
     377                 : 
     378                 : void
     379               0 : ShadowLayerForwarder::DestroySharedSurface(gfxSharedImageSurface* aSurface)
     380                 : {
     381               0 :   mShadowManager->DeallocShmem(aSurface->GetShmem());
     382               0 : }
     383                 : 
     384                 : bool
     385               0 : ShadowLayerForwarder::AllocBuffer(const gfxIntSize& aSize,
     386                 :                                   gfxASurface::gfxContentType aContent,
     387                 :                                   gfxSharedImageSurface** aBuffer)
     388                 : {
     389               0 :   NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
     390                 : 
     391               0 :   gfxASurface::gfxImageFormat format = OptimalFormatFor(aContent);
     392               0 :   SharedMemory::SharedMemoryType shmemType = OptimalShmemType();
     393                 : 
     394                 :   nsRefPtr<gfxSharedImageSurface> back =
     395               0 :     gfxSharedImageSurface::CreateUnsafe(mShadowManager, aSize, format, shmemType);
     396               0 :   if (!back)
     397               0 :     return false;
     398                 : 
     399               0 :   *aBuffer = nsnull;
     400               0 :   back.swap(*aBuffer);
     401               0 :   return true;
     402                 : }
     403                 : 
     404                 : bool
     405               0 : ShadowLayerForwarder::AllocDoubleBuffer(const gfxIntSize& aSize,
     406                 :                                         gfxASurface::gfxContentType aContent,
     407                 :                                         SurfaceDescriptor* aFrontBuffer,
     408                 :                                         SurfaceDescriptor* aBackBuffer)
     409                 : {
     410               0 :   bool tryPlatformSurface = true;
     411                 : #ifdef DEBUG
     412               0 :   tryPlatformSurface = !PR_GetEnv("MOZ_LAYERS_FORCE_SHMEM_SURFACES");
     413                 : #endif
     414               0 :   if (tryPlatformSurface &&
     415               0 :       PlatformAllocDoubleBuffer(aSize, aContent, aFrontBuffer, aBackBuffer)) {
     416               0 :     return true;
     417                 :   }
     418                 : 
     419               0 :   nsRefPtr<gfxSharedImageSurface> front;
     420               0 :   nsRefPtr<gfxSharedImageSurface> back;
     421               0 :   if (!AllocDoubleBuffer(aSize, aContent,
     422               0 :                          getter_AddRefs(front), getter_AddRefs(back))) {
     423               0 :     return false;
     424                 :   }
     425                 : 
     426               0 :   *aFrontBuffer = front->GetShmem();
     427               0 :   *aBackBuffer = back->GetShmem();
     428               0 :   return true;
     429                 : }
     430                 : 
     431                 : bool
     432               0 : ShadowLayerForwarder::AllocBuffer(const gfxIntSize& aSize,
     433                 :                                   gfxASurface::gfxContentType aContent,
     434                 :                                   SurfaceDescriptor* aBuffer)
     435                 : {
     436               0 :   bool tryPlatformSurface = true;
     437                 : #ifdef DEBUG
     438               0 :   tryPlatformSurface = !PR_GetEnv("MOZ_LAYERS_FORCE_SHMEM_SURFACES");
     439                 : #endif
     440               0 :   if (tryPlatformSurface &&
     441               0 :       PlatformAllocBuffer(aSize, aContent, aBuffer)) {
     442               0 :     return true;
     443                 :   }
     444                 : 
     445               0 :   nsRefPtr<gfxSharedImageSurface> buffer;
     446               0 :   if (!AllocBuffer(aSize, aContent,
     447               0 :                    getter_AddRefs(buffer)))
     448               0 :     return false;
     449                 : 
     450               0 :   *aBuffer = buffer->GetShmem();
     451               0 :   return true;
     452                 : }
     453                 : 
     454                 : /*static*/ already_AddRefed<gfxASurface>
     455               0 : ShadowLayerForwarder::OpenDescriptor(const SurfaceDescriptor& aSurface)
     456                 : {
     457               0 :   nsRefPtr<gfxASurface> surf = PlatformOpenDescriptor(aSurface);
     458               0 :   if (surf) {
     459               0 :     return surf.forget();
     460                 :   }
     461                 : 
     462               0 :   switch (aSurface.type()) {
     463                 :   case SurfaceDescriptor::TShmem: {
     464               0 :     surf = gfxSharedImageSurface::Open(aSurface.get_Shmem());
     465               0 :     return surf.forget();
     466                 :   }
     467                 :   default:
     468               0 :     NS_RUNTIMEABORT("unexpected SurfaceDescriptor type!");
     469               0 :     return nsnull;
     470                 :   }
     471                 : }
     472                 : 
     473                 : // Destroy the Shmem SurfaceDescriptor |aSurface|.
     474                 : template<class ShmemDeallocator>
     475                 : static void
     476               0 : DestroySharedShmemSurface(SurfaceDescriptor* aSurface,
     477                 :                           ShmemDeallocator* aDeallocator)
     478                 : {
     479               0 :   switch (aSurface->type()) {
     480                 :   case SurfaceDescriptor::TShmem: {
     481               0 :     aDeallocator->DeallocShmem(aSurface->get_Shmem());
     482               0 :     *aSurface = SurfaceDescriptor();
     483               0 :     return;
     484                 :   }
     485                 :   default:
     486               0 :     NS_RUNTIMEABORT("unexpected SurfaceDescriptor type!");
     487               0 :     return;
     488                 :   }
     489                 : }
     490                 : 
     491                 : void
     492               0 : ShadowLayerForwarder::DestroySharedSurface(SurfaceDescriptor* aSurface)
     493                 : {
     494               0 :   if (PlatformDestroySharedSurface(aSurface)) {
     495               0 :     return;
     496                 :   }
     497               0 :   if (aSurface->type() == SurfaceDescriptor::TShmem) {
     498               0 :     DestroySharedShmemSurface(aSurface, mShadowManager);
     499                 :   }
     500                 : }
     501                 : 
     502                 : 
     503                 : PLayerChild*
     504               0 : ShadowLayerForwarder::ConstructShadowFor(ShadowableLayer* aLayer)
     505                 : {
     506               0 :   NS_ABORT_IF_FALSE(HasShadowManager(), "no manager to forward to");
     507               0 :   return mShadowManager->SendPLayerConstructor(new ShadowLayerChild(aLayer));
     508                 : }
     509                 : 
     510                 : 
     511                 : void
     512               0 : ShadowLayerManager::DestroySharedSurface(gfxSharedImageSurface* aSurface,
     513                 :                                          PLayersParent* aDeallocator)
     514                 : {
     515               0 :   aDeallocator->DeallocShmem(aSurface->GetShmem());
     516               0 : }
     517                 : 
     518                 : void
     519               0 : ShadowLayerManager::DestroySharedSurface(SurfaceDescriptor* aSurface,
     520                 :                                          PLayersParent* aDeallocator)
     521                 : {
     522               0 :   if (PlatformDestroySharedSurface(aSurface)) {
     523               0 :     return;
     524                 :   }
     525               0 :   if (aSurface->type() == SurfaceDescriptor::TShmem) {
     526               0 :     DestroySharedShmemSurface(aSurface, aDeallocator);
     527                 :   }
     528                 : }
     529                 : 
     530                 : 
     531                 : #if !defined(MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS)
     532                 : 
     533                 : bool
     534                 : ShadowLayerForwarder::PlatformAllocDoubleBuffer(const gfxIntSize&,
     535                 :                                                 gfxASurface::gfxContentType,
     536                 :                                                 SurfaceDescriptor*,
     537                 :                                                 SurfaceDescriptor*)
     538                 : {
     539                 :   return false;
     540                 : }
     541                 : 
     542                 : bool
     543                 : ShadowLayerForwarder::PlatformAllocBuffer(const gfxIntSize&,
     544                 :                                           gfxASurface::gfxContentType,
     545                 :                                           SurfaceDescriptor*)
     546                 : {
     547                 :   return false;
     548                 : }
     549                 : 
     550                 : /*static*/ already_AddRefed<gfxASurface>
     551                 : ShadowLayerForwarder::PlatformOpenDescriptor(const SurfaceDescriptor&)
     552                 : {
     553                 :   return nsnull;
     554                 : }
     555                 : 
     556                 : bool
     557                 : ShadowLayerForwarder::PlatformDestroySharedSurface(SurfaceDescriptor*)
     558                 : {
     559                 :   return false;
     560                 : }
     561                 : 
     562                 : /*static*/ void
     563                 : ShadowLayerForwarder::PlatformSyncBeforeUpdate()
     564                 : {
     565                 : }
     566                 : 
     567                 : bool
     568                 : ShadowLayerManager::PlatformDestroySharedSurface(SurfaceDescriptor*)
     569                 : {
     570                 :   return false;
     571                 : }
     572                 : 
     573                 : /*static*/ void
     574                 : ShadowLayerManager::PlatformSyncBeforeReplyUpdate()
     575                 : {
     576                 : }
     577                 : 
     578                 : #endif  // !defined(MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS)
     579                 : 
     580                 : bool
     581               0 : IsSurfaceDescriptorValid(const SurfaceDescriptor& aSurface)
     582                 : {
     583               0 :   return SurfaceDescriptor::T__None != aSurface.type();
     584                 : }
     585                 : 
     586                 : } // namespace layers
     587                 : } // namespace mozilla

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