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comparison: gfx/thebes/gfxReusableSharedImageSurfaceWrapper.cpp
gfx/thebes/gfxReusableSharedImageSurfaceWrapper.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:b81558fcc3e5 |
|---|---|
| 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/. */ | |
| 4 | |
| 5 #include "gfxReusableSharedImageSurfaceWrapper.h" | |
| 6 #include "gfxSharedImageSurface.h" | |
| 7 #include "mozilla/layers/ISurfaceAllocator.h" | |
| 8 | |
| 9 using mozilla::ipc::Shmem; | |
| 10 using mozilla::layers::ISurfaceAllocator; | |
| 11 | |
| 12 gfxReusableSharedImageSurfaceWrapper::gfxReusableSharedImageSurfaceWrapper(ISurfaceAllocator* aAllocator, | |
| 13 gfxSharedImageSurface* aSurface) | |
| 14 : mAllocator(aAllocator) | |
| 15 , mSurface(aSurface) | |
| 16 { | |
| 17 MOZ_COUNT_CTOR(gfxReusableSharedImageSurfaceWrapper); | |
| 18 ReadLock(); | |
| 19 } | |
| 20 | |
| 21 gfxReusableSharedImageSurfaceWrapper::~gfxReusableSharedImageSurfaceWrapper() | |
| 22 { | |
| 23 MOZ_COUNT_DTOR(gfxReusableSharedImageSurfaceWrapper); | |
| 24 ReadUnlock(); | |
| 25 } | |
| 26 | |
| 27 void | |
| 28 gfxReusableSharedImageSurfaceWrapper::ReadLock() | |
| 29 { | |
| 30 NS_ASSERT_OWNINGTHREAD(gfxReusableSharedImageSurfaceWrapper); | |
| 31 mSurface->ReadLock(); | |
| 32 } | |
| 33 | |
| 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"); | |
| 39 | |
| 40 if (readCount == 0) { | |
| 41 mAllocator->DeallocShmem(mSurface->GetShmem()); | |
| 42 } | |
| 43 } | |
| 44 | |
| 45 gfxReusableSurfaceWrapper* | |
| 46 gfxReusableSharedImageSurfaceWrapper::GetWritable(gfxImageSurface** aSurface) | |
| 47 { | |
| 48 NS_ASSERT_OWNINGTHREAD(gfxReusableSharedImageSurfaceWrapper); | |
| 49 | |
| 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 } | |
| 56 | |
| 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; | |
| 62 | |
| 63 // We need to create a new wrapper since this wrapper has an external ReadLock | |
| 64 gfxReusableSurfaceWrapper* wrapper = new gfxReusableSharedImageSurfaceWrapper(mAllocator, copySurface); | |
| 65 | |
| 66 // No need to release the ReadLock on the surface, this will happen when | |
| 67 // the wrapper is destroyed. | |
| 68 | |
| 69 return wrapper; | |
| 70 } | |
| 71 | |
| 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 } | |
| 78 | |
| 79 gfxImageFormat | |
| 80 gfxReusableSharedImageSurfaceWrapper::Format() | |
| 81 { | |
| 82 return mSurface->Format(); | |
| 83 } | |
| 84 | |
| 85 Shmem& | |
| 86 gfxReusableSharedImageSurfaceWrapper::GetShmem() | |
| 87 { | |
| 88 return mSurface->GetShmem(); | |
| 89 } | |
| 90 | |
| 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 } |
