The Tor Browser: gfx/thebes/gfxReusableSharedImageSurfaceWrapper.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "gfxReusableSharedImageSurfaceWrapper.h"

     6 #include "gfxSharedImageSurface.h"

     7 #include "mozilla/layers/ISurfaceAllocator.h"

     9 using mozilla::ipc::Shmem;

    10 using mozilla::layers::ISurfaceAllocator;

    12 gfxReusableSharedImageSurfaceWrapper::gfxReusableSharedImageSurfaceWrapper(ISurfaceAllocator* aAllocator,

    13                                                                            gfxSharedImageSurface* aSurface)

    14   : mAllocator(aAllocator)

    15   , mSurface(aSurface)

    16 {

    17   MOZ_COUNT_CTOR(gfxReusableSharedImageSurfaceWrapper);

    18   ReadLock();

    19 }

    21 gfxReusableSharedImageSurfaceWrapper::~gfxReusableSharedImageSurfaceWrapper()

    22 {

    23   MOZ_COUNT_DTOR(gfxReusableSharedImageSurfaceWrapper);

    24   ReadUnlock();

    25 }

    27 void

    28 gfxReusableSharedImageSurfaceWrapper::ReadLock()

    29 {

    30   NS_ASSERT_OWNINGTHREAD(gfxReusableSharedImageSurfaceWrapper);

    31   mSurface->ReadLock();

    32 }

    34 void

    35 gfxReusableSharedImageSurfaceWrapper::ReadUnlock()

    36 {

    37   int32_t readCount = mSurface->ReadUnlock();

    38   NS_ABORT_IF_FALSE(readCount >= 0, "Read count should not be negative");

    40   if (readCount == 0) {

    41     mAllocator->DeallocShmem(mSurface->GetShmem());

    42   }

    43 }

    45 gfxReusableSurfaceWrapper*

    46 gfxReusableSharedImageSurfaceWrapper::GetWritable(gfxImageSurface** aSurface)

    47 {

    48   NS_ASSERT_OWNINGTHREAD(gfxReusableSharedImageSurfaceWrapper);

    50   int32_t readCount = mSurface->GetReadCount();

    51   NS_ABORT_IF_FALSE(readCount > 0, "A ReadLock must be held when calling GetWritable");

    52   if (readCount == 1) {

    53     *aSurface = mSurface;

    54     return this;

    55   }

    57   // Something else is reading the surface, copy it

    58   nsRefPtr<gfxSharedImageSurface> copySurface =

    59     gfxSharedImageSurface::CreateUnsafe(mAllocator.get(), mSurface->GetSize(), mSurface->Format());

    60   copySurface->CopyFrom(mSurface);

    61   *aSurface = copySurface;

    63   // We need to create a new wrapper since this wrapper has an external ReadLock

    64   gfxReusableSurfaceWrapper* wrapper = new gfxReusableSharedImageSurfaceWrapper(mAllocator, copySurface);

    66   // No need to release the ReadLock on the surface, this will happen when

    67   // the wrapper is destroyed.

    69   return wrapper;

    70 }

    72 const unsigned char*

    73 gfxReusableSharedImageSurfaceWrapper::GetReadOnlyData() const

    74 {

    75   NS_ABORT_IF_FALSE(mSurface->GetReadCount() > 0, "Should have read lock");

    76   return mSurface->Data();

    77 }

    79 gfxImageFormat

    80 gfxReusableSharedImageSurfaceWrapper::Format()

    81 {

    82   return mSurface->Format();

    83 }

    85 Shmem&

    86 gfxReusableSharedImageSurfaceWrapper::GetShmem()

    87 {

    88   return mSurface->GetShmem();

    89 }

    91 /* static */ already_AddRefed<gfxReusableSharedImageSurfaceWrapper>

    92 gfxReusableSharedImageSurfaceWrapper::Open(ISurfaceAllocator* aAllocator, const Shmem& aShmem)

    93 {

    94   nsRefPtr<gfxSharedImageSurface> sharedImage = gfxSharedImageSurface::Open(aShmem);

    95   nsRefPtr<gfxReusableSharedImageSurfaceWrapper> wrapper = new gfxReusableSharedImageSurfaceWrapper(aAllocator, sharedImage);

    96   wrapper->ReadUnlock();

    97   return wrapper.forget();

    98 }

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