Added wxUSE_DC_CACHEING and associated code to wxMSW

Added EnableCache, CacheEnabled to wxDCBase
Added mask source args to DoBlit, Blit
Added cache testing code to dragimag sample
Added wxSystemOptions, regenerated makefiles


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10962 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/sysopt.h

@@ -0,0 +1,44 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        sysopt.h
+// Purpose:     wxSystemOptions
+// Author:      Julian Smart
+// Modified by:
+// Created:     2001-07-10
+// RCS-ID:      $Id$
+// Copyright:   (c) Julian Smart
+// Licence:   	wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_SYSOPT_H_
+#define _WX_SYSOPT_H_
+
+#include "wx/object.h"
+
+#if wxUSE_SYSTEM_OPTIONS
+
+// ----------------------------------------------------------------------------
+// Enables an application to influence the wxWindows implementation
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxSystemOptions : public wxObject
+{
+public:
+    wxSystemOptions() { }
+
+    // User-customizable hints to wxWindows or associated libraries
+    // These could also be used to influence GetSystem... calls, indeed
+    // to implement SetSystemColour/Font/Metric
+
+    static void SetOption(const wxString& name, const wxString& value);
+    static void SetOption(const wxString& name, int value);
+    static wxString GetOption(const wxString& name) ;
+    static int GetOptionInt(const wxString& name) ;
+    static bool HasOption(const wxString& name) ;
+};
+
+#endif
+
+
+#endif
+    // _WX_SYSOPT_H_
+