gfx/ipc/SharedDIBWin.h

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   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
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   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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  14  *
  15  * The Original Code is mozilla.org code.
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  17  * The Initial Developer of the Original Code is
  18  * Mozilla Foundation.
  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 #ifndef gfx_SharedDIBWin_h__
  40 #define gfx_SharedDIBWin_h__
  41
  42 #include <windows.h>
  43
  44 #include "SharedDIB.h"
  45
  46 namespace mozilla {
  47 namespace gfx {
  48
  49 class SharedDIBWin : public SharedDIB
  50 {
  51 public:
  52   SharedDIBWin();
  53   ~SharedDIBWin();
  54
  55   // Allocate a new win32 dib section compatible with an hdc. The dib will
  56   // be selected into the hdc on return.
  57   nsresult Create(HDC aHdc, PRUint32 aWidth, PRUint32 aHeight, PRUint32 aDepth);
  58
  59   // Wrap a dib section around an existing shared memory object. aHandle should
  60   // point to a section large enough for the dib's memory, otherwise this call
  61   // will fail.
  62   nsresult Attach(Handle aHandle, PRUint32 aWidth, PRUint32 aHeight, PRUint32 aDepth);
  63
  64   // Destroy or release resources associated with this dib.
  65   nsresult Close();
  66
  67   // Return the HDC of the shared dib.
  68   HDC GetHDC() { return mSharedHdc; }
  69
  70 private:
  71   HDC                 mSharedHdc;
  72   HBITMAP             mSharedBmp;
  73   HGDIOBJ             mOldObj;
  74
  75   PRUint32 SetupBitmapHeader(PRUint32 aWidth, PRUint32 aHeight, PRUint32 aDepth, BITMAPINFOHEADER *aHeader);
  76   nsresult SetupSurface(HDC aHdc, BITMAPINFOHEADER *aHdr);
  77 };
  78
  79 } // gfx
  80 } // mozilla
  81
  82 #endif