The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/thebes/gfxReusableSharedImageSurfaceWrapper.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,98 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
     1.6 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +#include "gfxReusableSharedImageSurfaceWrapper.h"
     1.9 +#include "gfxSharedImageSurface.h"
    1.10 +#include "mozilla/layers/ISurfaceAllocator.h"
    1.11 +
    1.12 +using mozilla::ipc::Shmem;
    1.13 +using mozilla::layers::ISurfaceAllocator;
    1.14 +
    1.15 +gfxReusableSharedImageSurfaceWrapper::gfxReusableSharedImageSurfaceWrapper(ISurfaceAllocator* aAllocator,
    1.16 +                                                                           gfxSharedImageSurface* aSurface)
    1.17 +  : mAllocator(aAllocator)
    1.18 +  , mSurface(aSurface)
    1.19 +{
    1.20 +  MOZ_COUNT_CTOR(gfxReusableSharedImageSurfaceWrapper);
    1.21 +  ReadLock();
    1.22 +}
    1.23 +
    1.24 +gfxReusableSharedImageSurfaceWrapper::~gfxReusableSharedImageSurfaceWrapper()
    1.25 +{
    1.26 +  MOZ_COUNT_DTOR(gfxReusableSharedImageSurfaceWrapper);
    1.27 +  ReadUnlock();
    1.28 +}
    1.29 +
    1.30 +void
    1.31 +gfxReusableSharedImageSurfaceWrapper::ReadLock()
    1.32 +{
    1.33 +  NS_ASSERT_OWNINGTHREAD(gfxReusableSharedImageSurfaceWrapper);
    1.34 +  mSurface->ReadLock();
    1.35 +}
    1.36 +
    1.37 +void
    1.38 +gfxReusableSharedImageSurfaceWrapper::ReadUnlock()
    1.39 +{
    1.40 +  int32_t readCount = mSurface->ReadUnlock();
    1.41 +  NS_ABORT_IF_FALSE(readCount >= 0, "Read count should not be negative");
    1.42 +
    1.43 +  if (readCount == 0) {
    1.44 +    mAllocator->DeallocShmem(mSurface->GetShmem());
    1.45 +  }
    1.46 +}
    1.47 +
    1.48 +gfxReusableSurfaceWrapper*
    1.49 +gfxReusableSharedImageSurfaceWrapper::GetWritable(gfxImageSurface** aSurface)
    1.50 +{
    1.51 +  NS_ASSERT_OWNINGTHREAD(gfxReusableSharedImageSurfaceWrapper);
    1.52 +
    1.53 +  int32_t readCount = mSurface->GetReadCount();
    1.54 +  NS_ABORT_IF_FALSE(readCount > 0, "A ReadLock must be held when calling GetWritable");
    1.55 +  if (readCount == 1) {
    1.56 +    *aSurface = mSurface;
    1.57 +    return this;
    1.58 +  }
    1.59 +
    1.60 +  // Something else is reading the surface, copy it
    1.61 +  nsRefPtr<gfxSharedImageSurface> copySurface =
    1.62 +    gfxSharedImageSurface::CreateUnsafe(mAllocator.get(), mSurface->GetSize(), mSurface->Format());
    1.63 +  copySurface->CopyFrom(mSurface);
    1.64 +  *aSurface = copySurface;
    1.65 +
    1.66 +  // We need to create a new wrapper since this wrapper has an external ReadLock
    1.67 +  gfxReusableSurfaceWrapper* wrapper = new gfxReusableSharedImageSurfaceWrapper(mAllocator, copySurface);
    1.68 +
    1.69 +  // No need to release the ReadLock on the surface, this will happen when
    1.70 +  // the wrapper is destroyed.
    1.71 +
    1.72 +  return wrapper;
    1.73 +}
    1.74 +
    1.75 +const unsigned char*
    1.76 +gfxReusableSharedImageSurfaceWrapper::GetReadOnlyData() const
    1.77 +{
    1.78 +  NS_ABORT_IF_FALSE(mSurface->GetReadCount() > 0, "Should have read lock");
    1.79 +  return mSurface->Data();
    1.80 +}
    1.81 +
    1.82 +gfxImageFormat
    1.83 +gfxReusableSharedImageSurfaceWrapper::Format()
    1.84 +{
    1.85 +  return mSurface->Format();
    1.86 +}
    1.87 +
    1.88 +Shmem&
    1.89 +gfxReusableSharedImageSurfaceWrapper::GetShmem()
    1.90 +{
    1.91 +  return mSurface->GetShmem();
    1.92 +}
    1.93 +
    1.94 +/* static */ already_AddRefed<gfxReusableSharedImageSurfaceWrapper>
    1.95 +gfxReusableSharedImageSurfaceWrapper::Open(ISurfaceAllocator* aAllocator, const Shmem& aShmem)
    1.96 +{
    1.97 +  nsRefPtr<gfxSharedImageSurface> sharedImage = gfxSharedImageSurface::Open(aShmem);
    1.98 +  nsRefPtr<gfxReusableSharedImageSurfaceWrapper> wrapper = new gfxReusableSharedImageSurfaceWrapper(aAllocator, sharedImage);
    1.99 +  wrapper->ReadUnlock();
   1.100 +  return wrapper.forget();
   1.101 +}