gfx/ipc/SharedDIB.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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  15  * The Original Code is mozilla.org code.
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  19  * Portions created by the Initial Developer are Copyright (C) 2009
  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *   Jim Mathies <jmathies@mozilla.com>
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  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "SharedDIB.h"
  40
  41 namespace mozilla {
  42 namespace gfx {
  43
  44 SharedDIB::SharedDIB() :
  45   mShMem(nsnull)
  46 {
  47 }
  48
  49 SharedDIB::~SharedDIB()
  50 {
  51   Close();
  52 }
  53
  54 nsresult
  55 SharedDIB::Create(PRUint32 aSize)
  56 {
  57   Close();
  58
  59   mShMem = new base::SharedMemory();
  60   if (!mShMem || !mShMem->Create("", false, false, aSize))
  61     return NS_ERROR_OUT_OF_MEMORY;
  62
  63   return NS_OK;
  64 }
  65
  66 bool
  67 SharedDIB::IsValid()
  68 {
  69   if (!mShMem)
  70     return false;
  71
  72   return mShMem->IsHandleValid(mShMem->handle());
  73 }
  74
  75 nsresult
  76 SharedDIB::Close()
  77 {
  78   if (mShMem)
  79     delete mShMem;
  80
  81   mShMem = nsnull;
  82
  83   return NS_OK;
  84 }
  85
  86 nsresult
  87 SharedDIB::Attach(Handle aHandle, PRUint32 aSize)
  88 {
  89   Close();
  90
  91   mShMem = new base::SharedMemory(aHandle, false);
  92   if(!mShMem)
  93     return NS_ERROR_OUT_OF_MEMORY;
  94
  95   return NS_OK;
  96 }
  97
  98 nsresult
  99 SharedDIB::ShareToProcess(base::ProcessHandle aChildProcess, Handle *aChildHandle)
 100 {
 101   if (!mShMem)
 102     return NS_ERROR_UNEXPECTED;
 103
 104   if (!mShMem->ShareToProcess(aChildProcess, aChildHandle))
 105     return NS_ERROR_UNEXPECTED;
 106
 107   return NS_OK;
 108 }
 109
 110 } // gfx
 111 } // mozilla