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plt-scheme  4.2.1
MemoryDC.h
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00001 /*                                                      -*- C++ -*-
00002  *
00003  * Purpose: device context to draw into wxBitmaps
00004  *
00005  * Authors: Markus Holzem and Julian Smart
00006  *
00007  * Copyright: (C) 2004-2009 PLT Scheme Inc.
00008  * Copyright: (C) 1995, AIAI, University of Edinburgh (Julian)
00009  * Copyright: (C) 1995, GNU (Markus)
00010  *
00011  * This program is free software; you can redistribute it and/or modify
00012  * it under the terms of the GNU General Public License as published by
00013  * the Free Software Foundation; either version 2 of the License, or
00014  * (at your option) any later version.
00015  *
00016  * This program is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  * GNU General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU General Public License
00022  * along with this program; if not, write to the Free Software
00023  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00024  * 02110-1301 USA.
00025  */
00026 
00027 #ifndef MemoryDC_h
00028 #define MemoryDC_h
00029 
00030 #ifdef __GNUG__
00031 #pragma interface
00032 #endif
00033 
00034 class wxBitmap;
00035 
00036 class wxMemoryDC : public wxCanvasDC {
00037 public:
00038     wxMemoryDC(Bool read_only = 0);
00039     ~wxMemoryDC(void);
00040 
00041     virtual void GetSize(double *w, double *h);
00042 
00043     void SelectObject(wxBitmap *bitmap);
00044     wxBitmap* GetObject();
00045 
00046 #ifdef WX_USE_XRENDER
00047     virtual void InitPicture();
00048 #endif
00049 
00050   virtual void FreeGetPixelCache(void);
00051 
00052 private:
00053     wxBitmap *selected; /* Need to keep pointer or it will be GC'ed */
00054     Bool read_only;
00055 };
00056 
00057 #endif // MemoryDC_h