http://code.google.com/p/rpcs3/source/detail?r=44

wxWidgets/include/wx/msw/dcmemory.h

@@ -0,0 +1,45 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/dcmemory.h
+// Purpose:     wxMemoryDC class
+// Author:      Julian Smart
+// Modified by:
+// Created:     01/02/97
+// RCS-ID:      $Id: dcmemory.h 48236 2007-08-20 23:43:32Z KO $
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_DCMEMORY_H_
+#define _WX_DCMEMORY_H_
+
+#include "wx/dcclient.h"
+
+class WXDLLEXPORT wxMemoryDC : public wxDC, public wxMemoryDCBase
+{
+public:
+    wxMemoryDC() { CreateCompatible(NULL); Init(); }
+    wxMemoryDC(wxBitmap& bitmap) { CreateCompatible(NULL); Init(); SelectObject(bitmap); }
+    wxMemoryDC(wxDC *dc); // Create compatible DC
+
+
+protected:
+    // override some base class virtuals
+    virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
+    virtual void DoGetSize(int* width, int* height) const;
+    virtual void DoSelect(const wxBitmap& bitmap);
+
+    virtual wxBitmap DoGetAsBitmap(const wxRect* subrect) const 
+    { return subrect == NULL ? GetSelectedBitmap() : GetSelectedBitmap().GetSubBitmapOfHDC(*subrect, GetHDC() );}
+
+    // create DC compatible with the given one or screen if dc == NULL
+    bool CreateCompatible(wxDC *dc);
+
+    // initialize the newly created DC
+    void Init();
+
+private:
+    DECLARE_DYNAMIC_CLASS_NO_COPY(wxMemoryDC)
+};
+
+#endif
+    // _WX_DCMEMORY_H_