tor-browser

The Tor Browser
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TextureForwarder.h (2899B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef MOZILLA_LAYERS_TEXTUREFORWARDER
      8 #define MOZILLA_LAYERS_TEXTUREFORWARDER
      9 
     10 #include <stdint.h>  // for int32_t, uint64_t
     11 #include "gfxTypes.h"
     12 #include "mozilla/dom/ipc/IdType.h"
     13 #include "mozilla/ipc/ProtocolUtils.h"
     14 #include "mozilla/layers/LayersMessages.h"  // for Edit, etc
     15 #include "mozilla/layers/LayersTypes.h"     // for LayersBackend
     16 #include "mozilla/layers/TextureClient.h"   // for TextureClient
     17 #include "mozilla/layers/KnowsCompositor.h"
     18 #include "nsISerialEventTarget.h"
     19 
     20 namespace mozilla {
     21 namespace layers {
     22 class CanvasChild;
     23 
     24 /**
     25 * An abstract interface for classes that implement the autogenerated
     26 * IPDL actor class. Lets us check if they are still valid for IPC.
     27 */
     28 class LayersIPCActor {
     29 public:
     30  virtual bool IPCOpen() const { return true; }
     31 };
     32 
     33 /**
     34 * An abstract interface for LayersIPCActors that implement a top-level
     35 * IPDL protocol so also have their own channel.
     36 * Has their own MessageLoop for message dispatch, and can allocate
     37 * shmem.
     38 */
     39 class LayersIPCChannel : public LayersIPCActor,
     40                         public mozilla::ipc::IShmemAllocator {
     41 public:
     42  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
     43 
     44  virtual bool IsSameProcess() const = 0;
     45 
     46  virtual bool UsesImageBridge() const { return false; }
     47 
     48  virtual base::ProcessId GetParentPid() const = 0;
     49 
     50  virtual nsISerialEventTarget* GetThread() const = 0;
     51 
     52  virtual FixedSizeSmallShmemSectionAllocator* GetTileLockAllocator() {
     53    return nullptr;
     54  }
     55 
     56  virtual void CancelWaitForNotifyNotUsed(uint64_t aTextureId) = 0;
     57 
     58  virtual wr::MaybeExternalImageId GetNextExternalImageId() {
     59    return Nothing();
     60  }
     61 
     62 protected:
     63  virtual ~LayersIPCChannel() = default;
     64 };
     65 
     66 /**
     67 * An abstract interface for classes that can allocate PTexture objects
     68 * across IPDL. Currently a sub-class of LayersIPCChannel for simplicity
     69 * since all our implementations use both, but could be independant if needed.
     70 */
     71 class TextureForwarder : public LayersIPCChannel {
     72 public:
     73  /**
     74   * Create a TextureChild/Parent pair as as well as the TextureHost on the
     75   * parent side.
     76   */
     77  virtual PTextureChild* CreateTexture(
     78      const SurfaceDescriptor& aSharedData, ReadLockDescriptor&& aReadLock,
     79      LayersBackend aLayersBackend, TextureFlags aFlags,
     80      const dom::ContentParentId& aContentId, uint64_t aSerial,
     81      wr::MaybeExternalImageId& aExternalImageId) = 0;
     82 
     83  /**
     84   * Returns the CanvasChild for this TextureForwarder.
     85   */
     86  virtual already_AddRefed<CanvasChild> GetCanvasChild() { return nullptr; };
     87 };
     88 
     89 }  // namespace layers
     90 }  // namespace mozilla
     91 
     92 #endif