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 <string>
  10
  11 #include "mozilla/dom/PWebGLChild.h"
  12 #include "mozilla/dom/IpdlQueue.h"
  13
  14 // This is a bit weird. Nothing directly in WebGLChild.h necessitates including
  15 // WebGLParent.h, but if we don't do this, we get compiler errors in the
  16 // generated code inside PWebGLChild.cpp. The error is due to a complex
  17 // dependency chain involving IpdlQueue, which I won't go into here. Including
  18 // WebGLParent.h inside WebGLChild.h is the simplest way we could think of to
  19 // avoid this issue. Including it in any of the code more directly involved in
  20 // the breaking dependency chain unfortunately introduces a cyclical dependency
  21 // between WebGLParent.h and PWebGLParent.h.
  22 #include "mozilla/dom/WebGLParent.h"
  23
  24 namespace mozilla {
  25
  26 class ClientWebGLContext;
  27
  28 namespace dom {
  29
  30 struct FlushedCmdInfo final {
  31   size_t flushes = 0;
  32   size_t flushedCmdBytes = 0;
  33 };
  34
  35 class WebGLChild final : public PWebGLChild, public SupportsWeakPtr {
  36   const WeakPtr<ClientWebGLContext> mContext;
  37   const size_t mDefaultCmdsShmemSize;
  38   webgl::RaiiShmem mPendingCmdsShmem;
  39   size_t mPendingCmdsPos = 0;
  40   FlushedCmdInfo mFlushedCmdInfo;
  41
  42  public:
  43   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WebGLChild, override);
  44   using OtherSideActor = WebGLParent;
  45
  46   explicit WebGLChild(ClientWebGLContext&);
  47
  48   Maybe<Range<uint8_t>> AllocPendingCmdBytes(size_t);
  49   void FlushPendingCmds();
  50   void ActorDestroy(ActorDestroyReason why) override;
  51
  52  private:
  53   friend PWebGLChild;
  54   virtual ~WebGLChild();
  55
  56  public:
  57   mozilla::ipc::IPCResult RecvJsWarning(const std::string&) const;
  58   mozilla::ipc::IPCResult RecvOnContextLoss(webgl::ContextLossReason) const;
  59 };
  60
  61 }  // namespace dom
  62 }  // namespace mozilla
  63
  64 #endif  // WEBGLCHILD_H_