include/wx/dcbuffer.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/dcbuffer.h
   3 // Purpose:     wxBufferedDC class
   4 // Author:      Ron Lee <ron@debian.org>
   5 // Modified by:
   6 // Created:     16/03/02
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Ron Lee
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_DCBUFFER_H_
  13 #define _WX_DCBUFFER_H_
  14
  15 #ifdef __GNUG__
  16 #pragma interface "dcbuffer.h"
  17 #endif
  18
  19 #include "wx/dcmemory.h"
  20
  21
  22 // ==============================================================
  23 //   Double buffering helper.
  24 // --------------------------------------------------------------
  25
  26 class WXDLLEXPORT wxBufferedDC : public wxMemoryDC
  27 {
  28 private:
  29
  30         // Without the existence of a wxNullDC, this must be
  31         // a pointer, else it could probably be a reference.
  32
  33     wxDC        *m_dc;
  34     wxBitmap    m_buffer;
  35
  36 public:
  37
  38         // Default ctor, must subsequently call Init for
  39         // two stage construction.
  40
  41     wxBufferedDC()
  42         : m_dc( 0 )
  43     {}
  44
  45         // Construct a wxBufferedDC using a user supplied buffer.
  46
  47     wxBufferedDC( wxDC *dc, const wxBitmap &buffer );
  48
  49         // Construct a wxBufferedDC with an internal buffer of 'area'
  50         // (where area is usually something like the size of the window
  51         // being buffered)
  52
  53     wxBufferedDC( wxDC *dc, const wxSize &area );
  54
  55     // default copy ctor ok.
  56
  57         // The usually desired  action in the dtor is to blit the buffer.
  58
  59     ~wxBufferedDC();
  60
  61         // These reimplement the actions of the ctors for
  62         // two stage creation, but are not used by the ctors
  63         // themselves to save a few cpu cycles.
  64
  65     void Init( wxDC *dc, const wxBitmap &bitmap );
  66     void Init( wxDC *dc, const wxSize &area );
  67
  68         // Blits the buffer to the dc, and detaches the dc from
  69         // the buffer.  Usually called in the dtor or by the dtor
  70         // of derived classes if the BufferedDC must blit before
  71         // the derived class (which may own the dc it's blitting
  72         // to) is destroyed.
  73
  74     void UnMask();
  75 };
  76
  77
  78 // ==============================================================
  79 //   Double buffered PaintDC.
  80 // --------------------------------------------------------------
  81
  82 // Creates a double buffered wxPaintDC, optionally allowing the
  83 // user to specify their own buffer to use.
  84
  85 class WXDLLEXPORT wxBufferedPaintDC : public wxBufferedDC
  86 {
  87 private:
  88
  89     wxPaintDC    m_paintdc;
  90
  91 public:
  92
  93     wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer = wxNullBitmap );
  94
  95     // default copy ctor ok.
  96
  97     ~wxBufferedPaintDC();
  98 };
  99
 100
 101 #endif  // _WX_DCBUFFER_H_
 102
 103 // vi:sts=4:sw=4:et