Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_LAYERS_ISURFACEDEALLOCATOR
#define GFX_LAYERS_ISURFACEDEALLOCATOR
#include <stddef.h> // for size_t
#include <stdint.h> // for uint32_t
#include "gfxTypes.h"
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/RefPtr.h"
#include "nsIMemoryReporter.h" // for nsIMemoryReporter
#include "mozilla/Atomics.h" // for Atomic
#include "mozilla/layers/LayersMessages.h" // for ShmemSection
namespace mozilla {
namespace ipc {
class Shmem;
class IShmemAllocator;
} // namespace ipc
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace layers {
class CompositableForwarder;
class CompositorBridgeParentBase;
class TextureForwarder;
class ShmemSectionAllocator;
class LegacySurfaceDescriptorAllocator;
class ClientIPCAllocator;
class HostIPCAllocator;
class LayersIPCChannel;
enum BufferCapabilities {
DEFAULT_BUFFER_CAPS = 0,
/**
* The allocated buffer must be efficiently mappable as a DataSourceSurface.
*/
MAP_AS_IMAGE_SURFACE = 1 << 0,
/**
* The allocated buffer will be used for GL rendering only
*/
USING_GL_RENDERING_ONLY = 1 << 1
};
class SurfaceDescriptor;
/**
* An interface used to create and destroy surfaces that are shared with the
* Compositor process (using shmem, or other platform specific memory)
*
* Most of the methods here correspond to methods that are implemented by IPDL
* actors without a common polymorphic interface.
* These methods should be only called in the ipdl implementor's thread, unless
* specified otherwise in the implementing class.
*/
class ISurfaceAllocator {
public:
MOZ_DECLARE_REFCOUNTED_TYPENAME(ISurfaceAllocator)
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ISurfaceAllocator)
ISurfaceAllocator() = default;
// down-casting
virtual mozilla::ipc::IShmemAllocator* AsShmemAllocator() { return nullptr; }
virtual ShmemSectionAllocator* AsShmemSectionAllocator() { return nullptr; }
virtual CompositableForwarder* AsCompositableForwarder() { return nullptr; }
virtual TextureForwarder* GetTextureForwarder() { return nullptr; }
virtual ClientIPCAllocator* AsClientAllocator() { return nullptr; }
virtual HostIPCAllocator* AsHostIPCAllocator() { return nullptr; }
virtual LegacySurfaceDescriptorAllocator*
AsLegacySurfaceDescriptorAllocator() {
return nullptr;
}
virtual CompositorBridgeParentBase* AsCompositorBridgeParentBase() {
return nullptr;
}
// ipc info
virtual bool IPCOpen() const { return true; }
virtual bool IsSameProcess() const = 0;
virtual bool UsesImageBridge() const { return false; }
virtual bool UsesWebRenderBridge() const { return false; }
protected:
void Finalize() {}
virtual ~ISurfaceAllocator() = default;
};
/// Methods that are specific to the client/child side.
class ClientIPCAllocator : public ISurfaceAllocator {
public:
ClientIPCAllocator() = default;
ClientIPCAllocator* AsClientAllocator() override { return this; }
virtual base::ProcessId GetParentPid() const = 0;
virtual MessageLoop* GetMessageLoop() const = 0;
virtual void CancelWaitForNotifyNotUsed(uint64_t aTextureId) = 0;
};
/// Methods that are specific to the host/parent side.
class HostIPCAllocator : public ISurfaceAllocator {
public:
HostIPCAllocator() = default;
HostIPCAllocator* AsHostIPCAllocator() override { return this; }
/**
* Get child side's process Id.
*/
virtual base::ProcessId GetChildProcessId() = 0;
virtual void NotifyNotUsed(PTextureParent* aTexture,
uint64_t aTransactionId) = 0;
virtual void SendAsyncMessage(
const nsTArray<AsyncParentMessageData>& aMessage) = 0;
virtual void SendPendingAsyncMessages();
virtual void SetAboutToSendAsyncMessages() {
mAboutToSendAsyncMessages = true;
}
bool IsAboutToSendAsyncMessages() { return mAboutToSendAsyncMessages; }
protected:
std::vector<AsyncParentMessageData> mPendingAsyncMessage;
bool mAboutToSendAsyncMessages = false;
};
/// An allocator that can group allocations in bigger chunks of shared memory.
///
/// The allocated shmem sections can only be deallocated by the same allocator
/// instance (and only in the child process).
class ShmemSectionAllocator {
public:
virtual bool AllocShmemSection(uint32_t aSize,
ShmemSection* aShmemSection) = 0;
virtual void DeallocShmemSection(ShmemSection& aShmemSection) = 0;
virtual void MemoryPressure() {}
};
/// Some old stuff that's still around and used for screenshots.
///
/// New code should not need this (see TextureClient).
class LegacySurfaceDescriptorAllocator {
public:
virtual bool AllocSurfaceDescriptor(const gfx::IntSize& aSize,
gfxContentType aContent,
SurfaceDescriptor* aBuffer) = 0;
virtual bool AllocSurfaceDescriptorWithCaps(const gfx::IntSize& aSize,
gfxContentType aContent,
uint32_t aCaps,
SurfaceDescriptor* aBuffer) = 0;
virtual void DestroySurfaceDescriptor(SurfaceDescriptor* aSurface) = 0;
};
bool IsSurfaceDescriptorValid(const SurfaceDescriptor& aSurface);
already_AddRefed<gfx::DataSourceSurface> GetSurfaceForDescriptor(
const SurfaceDescriptor& aDescriptor);
uint8_t* GetAddressFromDescriptor(const SurfaceDescriptor& aDescriptor);
void DestroySurfaceDescriptor(mozilla::ipc::IShmemAllocator* aAllocator,
SurfaceDescriptor* aSurface);
class GfxMemoryImageReporter final : public nsIMemoryReporter {
~GfxMemoryImageReporter() = default;
public:
NS_DECL_ISUPPORTS
GfxMemoryImageReporter() {
#ifdef DEBUG
// There must be only one instance of this class, due to |sAmount|
// being static.
static bool hasRun = false;
MOZ_ASSERT(!hasRun);
hasRun = true;
#endif
}
MOZ_DEFINE_MALLOC_SIZE_OF_ON_ALLOC(MallocSizeOfOnAlloc)
MOZ_DEFINE_MALLOC_SIZE_OF_ON_FREE(MallocSizeOfOnFree)
static void DidAlloc(void* aPointer) {
sAmount += MallocSizeOfOnAlloc(aPointer);
}
static void WillFree(void* aPointer) {
sAmount -= MallocSizeOfOnFree(aPointer);
}
NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) override {
MOZ_COLLECT_REPORT(
"explicit/gfx/heap-textures", KIND_HEAP, UNITS_BYTES, sAmount,
"Heap memory shared between threads by texture clients and hosts.");
return NS_OK;
}
private:
// Typically we use |size_t| in memory reporters, but in the past this
// variable has sometimes gone negative due to missing DidAlloc() calls.
// Therefore, we use a signed type so that any such negative values show up
// as negative in about:memory, rather than as enormous positive numbers.
static mozilla::Atomic<ptrdiff_t> sAmount;
};
/// A simple shmem section allocator that can only allocate small
/// fixed size elements (only intended to be used to store tile
/// copy-on-write locks for now).
class FixedSizeSmallShmemSectionAllocator final : public ShmemSectionAllocator {
public:
enum AllocationStatus { STATUS_ALLOCATED, STATUS_FREED };
struct ShmemSectionHeapHeader {
Atomic<uint32_t> mTotalBlocks;
Atomic<uint32_t> mAllocatedBlocks;
};
struct ShmemSectionHeapAllocation {
Atomic<uint32_t> mStatus;
uint32_t mSize;
};
explicit FixedSizeSmallShmemSectionAllocator(LayersIPCChannel* aShmProvider);
~FixedSizeSmallShmemSectionAllocator();
bool AllocShmemSection(uint32_t aSize, ShmemSection* aShmemSection) override;
void DeallocShmemSection(ShmemSection& aShmemSection) override;
void MemoryPressure() override { ShrinkShmemSectionHeap(); }
// can be called on the compositor process.
static void FreeShmemSection(ShmemSection& aShmemSection);
void ShrinkShmemSectionHeap();
bool IPCOpen() const;
protected:
std::vector<mozilla::ipc::Shmem> mUsedShmems;
LayersIPCChannel* mShmProvider;
};
} // namespace layers
} // namespace mozilla
#endif