gfx/ipc/SharedDIB.h

   1 /* -*- Mode: C++; tab-width: 2; 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 gfx_SharedDIB_h__
   7 #define gfx_SharedDIB_h__
   8
   9 #include "base/shared_memory.h"
  10 #include "nscore.h"
  11
  12 namespace mozilla {
  13 namespace gfx {
  14
  15 class SharedDIB
  16 {
  17 public:
  18   typedef base::SharedMemoryHandle Handle;
  19
  20 public:
  21   SharedDIB();
  22   ~SharedDIB();
  23
  24   // Create and allocate a new shared dib.
  25   nsresult Create(uint32_t aSize);
  26
  27   // Destroy or release resources associated with this dib.
  28   nsresult Close();
  29
  30   // Returns true if this object contains a valid dib.
  31   bool IsValid();
  32
  33   // Wrap a new shared dib around allocated shared memory. Note aHandle must point
  34   // to a memory section large enough to hold a dib of size aSize, otherwise this
  35   // will fail.
  36   nsresult Attach(Handle aHandle, uint32_t aSize);
  37
  38   // Returns a SharedMemoryHandle suitable for sharing with another process.
  39   nsresult ShareToProcess(base::ProcessHandle aChildProcess, Handle *aChildHandle);
  40
  41 protected:
  42   base::SharedMemory *mShMem;
  43 };
  44
  45 } // gfx
  46 } // mozilla
  47
  48 #endif