dom/canvas/WebGLChild.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef WEBGLCHILD_H_
   7 #define WEBGLCHILD_H_
   8
   9 #include "mozilla/dom/PWebGLChild.h"
  10 #include "mozilla/ipc/BigBuffer.h"
  11 #include "mozilla/Maybe.h"
  12 #include "mozilla/WeakPtr.h"
  13
  14 #include <string>
  15
  16 namespace mozilla {
  17
  18 class ClientWebGLContext;
  19
  20 namespace dom {
  21
  22 struct FlushedCmdInfo final {
  23   size_t flushes = 0;
  24   // Store a number of flushes since last IPC congestion check.
  25   // It is reset to 0, when current IPC congestion check is done.
  26   size_t flushesSinceLastCongestionCheck = 0;
  27   // Incremented for each IPC congestion check.
  28   size_t congestionCheckGeneration = 0;
  29   size_t flushedCmdBytes = 0;
  30   size_t overhead = 0;
  31 };
  32
  33 class WebGLChild final : public PWebGLChild, public SupportsWeakPtr {
  34   const WeakPtr<ClientWebGLContext> mContext;
  35   const size_t mDefaultCmdsShmemSize;
  36   mozilla::ipc::BigBuffer mPendingCmdsShmem;
  37   size_t mPendingCmdsPos = 0;
  38   size_t mPendingCmdsAlignmentOverhead = 0;
  39   FlushedCmdInfo mFlushedCmdInfo;
  40
  41  public:
  42   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WebGLChild, override);
  43
  44   explicit WebGLChild(ClientWebGLContext&);
  45
  46   Maybe<Range<uint8_t>> AllocPendingCmdBytes(size_t,
  47                                              size_t fyiAlignmentOverhead);
  48   void FlushPendingCmds();
  49   void Destroy();
  50   void ActorDestroy(ActorDestroyReason why) override;
  51
  52   FlushedCmdInfo& GetFlushedCmdInfo() { return mFlushedCmdInfo; }
  53
  54  private:
  55   friend PWebGLChild;
  56   virtual ~WebGLChild();
  57
  58  public:
  59   mozilla::ipc::IPCResult RecvJsWarning(const std::string&) const;
  60   mozilla::ipc::IPCResult RecvOnContextLoss(webgl::ContextLossReason) const;
  61   mozilla::ipc::IPCResult RecvOnSyncComplete(webgl::ObjectId) const;
  62 };
  63
  64 }  // namespace dom
  65 }  // namespace mozilla
  66
  67 #endif  // WEBGLCHILD_H_