gfx/ipc/SharedDIBWin.h

   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
   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
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  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
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  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.
  21  *
  22  * Contributor(s):
  23  *   Jim Mathies <jmathies@mozilla.com>
  24  *
  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
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  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,
  58                   bool aTransparent);
  59
  60   // Wrap a dib section around an existing shared memory object. aHandle should
  61   // point to a section large enough for the dib's memory, otherwise this call
  62   // will fail.
  63   nsresult Attach(Handle aHandle, PRUint32 aWidth, PRUint32 aHeight,
  64                   bool aTransparent);
  65
  66   // Destroy or release resources associated with this dib.
  67   nsresult Close();
  68
  69   // Return the HDC of the shared dib.
  70   HDC GetHDC() { return mSharedHdc; }
  71
  72   // Return the bitmap bits.
  73   void* GetBits() { return mBitmapBits; }
  74
  75 private:
  76   HDC                 mSharedHdc;
  77   HBITMAP             mSharedBmp;
  78   HGDIOBJ             mOldObj;
  79   void*               mBitmapBits;
  80
  81   PRUint32 SetupBitmapHeader(PRUint32 aWidth, PRUint32 aHeight,
  82                              bool aTransparent, BITMAPV4HEADER *aHeader);
  83   nsresult SetupSurface(HDC aHdc, BITMAPV4HEADER *aHdr);
  84 };
  85
  86 } // gfx
  87 } // mozilla
  88
  89 #endif