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 MOZILLA_LAYERS_TEXTUREFORWARDER
#define MOZILLA_LAYERS_TEXTUREFORWARDER
#include <stdint.h> // for int32_t, uint64_t
#include "gfxTypes.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/layers/LayersMessages.h" // for Edit, etc
#include "mozilla/layers/LayersTypes.h" // for LayersBackend
#include "mozilla/layers/TextureClient.h" // for TextureClient
#include "mozilla/layers/KnowsCompositor.h"
#include "nsISerialEventTarget.h"
namespace mozilla {
namespace layers {
class CanvasChild;
/**
* An abstract interface for classes that implement the autogenerated
* IPDL actor class. Lets us check if they are still valid for IPC.
*/
class LayersIPCActor {
public:
virtual bool IPCOpen() const { return true; }
};
/**
* An abstract interface for LayersIPCActors that implement a top-level
* IPDL protocol so also have their own channel.
* Has their own MessageLoop for message dispatch, and can allocate
* shmem.
*/
class LayersIPCChannel : public LayersIPCActor,
public mozilla::ipc::IShmemAllocator {
public:
NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
virtual bool IsSameProcess() const = 0;
virtual bool UsesImageBridge() const { return false; }
virtual base::ProcessId GetParentPid() const = 0;
virtual nsISerialEventTarget* GetThread() const = 0;
virtual FixedSizeSmallShmemSectionAllocator* GetTileLockAllocator() {
return nullptr;
}
virtual void CancelWaitForNotifyNotUsed(uint64_t aTextureId) = 0;
virtual wr::MaybeExternalImageId GetNextExternalImageId() {
return Nothing();
}
protected:
virtual ~LayersIPCChannel() = default;
};
/**
* An abstract interface for classes that can allocate PTexture objects
* across IPDL. Currently a sub-class of LayersIPCChannel for simplicity
* since all our implementations use both, but could be independant if needed.
*/
class TextureForwarder : public LayersIPCChannel {
public:
/**
* Create a TextureChild/Parent pair as as well as the TextureHost on the
* parent side.
*/
virtual PTextureChild* CreateTexture(
const SurfaceDescriptor& aSharedData, ReadLockDescriptor&& aReadLock,
LayersBackend aLayersBackend, TextureFlags aFlags, uint64_t aSerial,
wr::MaybeExternalImageId& aExternalImageId) = 0;
/**
* Returns the CanvasChild for this TextureForwarder.
*/
virtual already_AddRefed<CanvasChild> GetCanvasChild() { return nullptr; };
};
} // namespace layers
} // namespace mozilla
#endif