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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /gfx/thebes/gfxBaseSharedMemorySurface.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/thebes/gfxBaseSharedMemorySurface.h')
-rw-r--r-- | gfx/thebes/gfxBaseSharedMemorySurface.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/gfx/thebes/gfxBaseSharedMemorySurface.h b/gfx/thebes/gfxBaseSharedMemorySurface.h new file mode 100644 index 0000000000..bf211edab5 --- /dev/null +++ b/gfx/thebes/gfxBaseSharedMemorySurface.h @@ -0,0 +1,165 @@ +// vim:set ts=4 sts=2 sw=2 et cin: +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * 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/. */ + +#ifndef GFX_SHARED_MEMORYSURFACE_H +#define GFX_SHARED_MEMORYSURFACE_H + +#include "mozilla/gfx/2D.h" +#include "mozilla/ipc/Shmem.h" +#include "mozilla/ipc/SharedMemory.h" + +#include "gfxASurface.h" +#include "gfxImageSurface.h" +#include "pratom.h" + +typedef struct _cairo_user_data_key cairo_user_data_key_t; + +struct SharedImageInfo { + int32_t width; + int32_t height; + gfxImageFormat format; + int32_t readCount; +}; + +inline SharedImageInfo* GetShmInfoPtr(const mozilla::ipc::Shmem& aShmem) { + return reinterpret_cast<SharedImageInfo*>( + aShmem.get<char>() + aShmem.Size<char>() - sizeof(SharedImageInfo)); +} + +extern const cairo_user_data_key_t SHM_KEY; + +template <typename Base, typename Sub> +class gfxBaseSharedMemorySurface : public Base { + typedef mozilla::ipc::SharedMemory SharedMemory; + typedef mozilla::ipc::Shmem Shmem; + + protected: + virtual ~gfxBaseSharedMemorySurface() { + MOZ_COUNT_DTOR(gfxBaseSharedMemorySurface); + } + + public: + /** + * Return a new gfxSharedImageSurface around a shmem segment newly + * allocated by this function. |aAllocator| is the object used to + * allocate the new shmem segment. Null is returned if creating + * the surface failed. + * + * NB: the *caller* is responsible for freeing the Shmem allocated + * by this function. + */ + template <class ShmemAllocator> + static already_AddRefed<Sub> Create(ShmemAllocator* aAllocator, + const mozilla::gfx::IntSize& aSize, + gfxImageFormat aFormat) { + return Create<ShmemAllocator, false>(aAllocator, aSize, aFormat); + } + + /** + * Return a new gfxSharedImageSurface that wraps a shmem segment + * already created by the Create() above. Bad things will happen + * if an attempt is made to wrap any other shmem segment. Null is + * returned if creating the surface failed. + */ + static already_AddRefed<Sub> Open(const Shmem& aShmem) { + SharedImageInfo* shmInfo = GetShmInfoPtr(aShmem); + mozilla::gfx::IntSize size(shmInfo->width, shmInfo->height); + if (!mozilla::gfx::Factory::CheckSurfaceSize(size)) return nullptr; + + gfxImageFormat format = shmInfo->format; + long stride = gfxImageSurface::ComputeStride(size, format); + + RefPtr<Sub> s = new Sub(size, stride, format, aShmem); + // We didn't create this Shmem and so don't free it on errors + return (s->CairoStatus() != 0) ? nullptr : s.forget(); + } + + template <class ShmemAllocator> + static already_AddRefed<Sub> CreateUnsafe(ShmemAllocator* aAllocator, + const mozilla::gfx::IntSize& aSize, + gfxImageFormat aFormat) { + return Create<ShmemAllocator, true>(aAllocator, aSize, aFormat); + } + + Shmem& GetShmem() { return mShmem; } + + static bool IsSharedImage(gfxASurface* aSurface) { + return (aSurface && aSurface->GetType() == gfxSurfaceType::Image && + aSurface->GetData(&SHM_KEY)); + } + + protected: + gfxBaseSharedMemorySurface(const mozilla::gfx::IntSize& aSize, long aStride, + gfxImageFormat aFormat, const Shmem& aShmem) + : Base(aShmem.get<unsigned char>(), aSize, aStride, aFormat) { + MOZ_COUNT_CTOR(gfxBaseSharedMemorySurface); + + mShmem = aShmem; + this->SetData(&SHM_KEY, this, nullptr); + } + + private: + void WriteShmemInfo() { + SharedImageInfo* shmInfo = GetShmInfoPtr(mShmem); + shmInfo->width = this->mSize.width; + shmInfo->height = this->mSize.height; + shmInfo->format = this->mFormat; + shmInfo->readCount = 0; + } + + int32_t ReadLock() { + SharedImageInfo* shmInfo = GetShmInfoPtr(mShmem); + return PR_ATOMIC_INCREMENT(&shmInfo->readCount); + } + + int32_t ReadUnlock() { + SharedImageInfo* shmInfo = GetShmInfoPtr(mShmem); + return PR_ATOMIC_DECREMENT(&shmInfo->readCount); + } + + int32_t GetReadCount() { + SharedImageInfo* shmInfo = GetShmInfoPtr(mShmem); + return shmInfo->readCount; + } + + static size_t GetAlignedSize(const mozilla::gfx::IntSize& aSize, + long aStride) { +#define MOZ_ALIGN_WORD(x) (((x) + 3) & ~3) + return MOZ_ALIGN_WORD(sizeof(SharedImageInfo) + aSize.height * aStride); + } + + template <class ShmemAllocator, bool Unsafe> + static already_AddRefed<Sub> Create(ShmemAllocator* aAllocator, + const mozilla::gfx::IntSize& aSize, + gfxImageFormat aFormat) { + if (!mozilla::gfx::Factory::CheckSurfaceSize(aSize)) return nullptr; + + Shmem shmem; + long stride = gfxImageSurface::ComputeStride(aSize, aFormat); + size_t size = GetAlignedSize(aSize, stride); + if (!Unsafe) { + if (!aAllocator->AllocShmem(size, &shmem)) return nullptr; + } else { + if (!aAllocator->AllocUnsafeShmem(size, &shmem)) return nullptr; + } + + RefPtr<Sub> s = new Sub(aSize, stride, aFormat, shmem); + if (s->CairoStatus() != 0) { + aAllocator->DeallocShmem(shmem); + return nullptr; + } + s->WriteShmemInfo(); + return s.forget(); + } + + Shmem mShmem; + + // Calling these is very bad, disallow it + gfxBaseSharedMemorySurface(const gfxBaseSharedMemorySurface&); + gfxBaseSharedMemorySurface& operator=(const gfxBaseSharedMemorySurface&); +}; + +#endif /* GFX_SHARED_MEMORYSURFACE_H */ |