transparent_painter.hpp

// transparent_painter.hpp

// Copyright (C) 2004 Steven Weiß (steven11@gmx.de)
//
// Permission to copy, use, sell and distribute this software is granted
// provided this copyright notice appears in all copies.
// Permission to modify the code and to distribute modified code is granted
// provided this copyright notice appears in all copies, and a notice
// that the code was modified is included with the copyright notice.
//
// This software is provided "as is" without express or implied warranty,
// and with no claim as to its suitability for any purpose.


#pragma once
#include <background_wnd/painter_holder.hpp>


namespace win32 { namespace gui {

class transparent_painter : public painter_base, public painter_holder
{    
public:
     typedef COLORREF param0;

     // c'tor
     transparent_painter(COLORREF crTransparent);
     
     // virtual functions of painter_base
     transparent_painter* clone() const;
     void draw(HDC hDC, int cx, int cy);

     // own functions
     void transparent_color(COLORREF crTransparent);
     COLORREF transparent_color() const;

private:
// only use our implementation on Win98 or below (TransparentBlt() has a resource leak on those OSes)
#if (!defined WINVER || WINVER < 0x0500)
     HBITMAP prepare_mask(HBITMAP hSourceBmp, int cx, int cy);
     void draw_transparent_bitmap(HDC hDC, HDC hSourceDC, HBITMAP hMaskBmp, int cx, int cy);
#endif    // #ifndef WINVER || WINVER < 0x0500

     COLORREF crTransparent_;
};

} }  // namespace win32::gui