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win/rfb_win32/DeviceContext.h

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+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+// DeviceContext base class, wrapping Windows HDC, plus some
+// helper classes tailored to particular types of DC, such as
+// window and device DCs.
+
+#ifndef __RFB_WIN32_DEVICECONTEXT_H__
+#define __RFB_WIN32_DEVICECONTEXT_H__
+
+#include <windows.h>
+#include <rfb/PixelFormat.h>
+#include <rfb/Rect.h>
+#include <rfb_win32/TCharArray.h>
+
+namespace rfb {
+
+  namespace win32 {
+
+    // Base class, providing methods to get the bounding (clip) box,
+    // and the pixel format, and access to the HDC itself.
+    class DeviceContext {
+    public:
+      DeviceContext() : dc(0) {}
+      virtual ~DeviceContext() {}
+      operator HDC() const {return dc;}
+      PixelFormat getPF() const;
+      static PixelFormat getPF(HDC dc);
+      Rect getClipBox() const;
+      static Rect getClipBox(HDC dc);
+    protected:
+      HDC dc;
+    };
+
+    // -=- DeviceContext that opens a specific display device
+    class DeviceDC : public DeviceContext {
+    public:
+      DeviceDC(const TCHAR* deviceName);
+      ~DeviceDC();
+    };
+
+    // Get a DC for a particular window's client area.
+    class WindowDC : public DeviceContext {
+    public:
+      WindowDC(HWND wnd);
+      virtual ~WindowDC();
+    protected:
+      HWND hwnd;
+    };
+
+    // Create a new DC, compatible with an existing one.
+    class CompatibleDC : public DeviceContext {
+    public:
+      CompatibleDC(HDC existing);
+      virtual ~CompatibleDC();
+    };
+
+    // Create a new DC, compatible with an existing one, and
+    // select the specified bitmap into it.
+    class BitmapDC : public CompatibleDC {
+    public:
+      BitmapDC(HDC hdc, HBITMAP hbitmap);
+      ~BitmapDC();
+    protected:
+      HBITMAP oldBitmap;
+    };
+
+  };
+};
+
+#endif