src/generic/dcbuffer.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        generic/dcbuffer.cpp
   3 // Purpose:     wxBufferedDC class
   4 // Author:      Ron Lee <ron@debian.org>
   5 // Modified by: Vadim Zeitlin (refactored, added bg preservation)
   6 // Created:     16/03/02
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Ron Lee
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13     #pragma implementation "dcbuffer.h"
  14 #endif
  15
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19     #pragma hdrstop
  20 #endif
  21
  22 #ifndef WX_PRECOMP
  23     #include "wx/window.h"
  24 #endif
  25
  26 #include "wx/dcbuffer.h"
  27
  28 // ----------------------------------------------------------------------------
  29 // Double buffering helper.
  30 // ----------------------------------------------------------------------------
  31
  32 wxBufferedDC::wxBufferedDC(wxDC *dc, const wxBitmap& buffer)
  33             : m_dc( dc ),
  34               m_buffer( buffer )
  35 {
  36     UseBuffer();
  37 }
  38
  39 wxBufferedDC::wxBufferedDC(wxDC *dc, const wxSize& area, int flags)
  40             : m_dc( dc ),
  41               m_buffer( area.GetWidth(), area.GetHeight() )
  42 {
  43     UseBuffer();
  44
  45     SaveBg(area, flags);
  46 }
  47
  48 void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
  49 {
  50     wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
  51                   _T("wxBufferedDC already initialised") );
  52
  53     m_dc = dc;
  54     m_buffer = buffer;
  55
  56     UseBuffer();
  57 }
  58
  59 void wxBufferedDC::Init(wxDC *dc, const wxSize& area, int flags)
  60 {
  61     Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()));
  62
  63     SaveBg(area, flags);
  64 }
  65
  66 void wxBufferedDC::UnMask()
  67 {
  68     wxASSERT_MSG( m_dc != 0,
  69                   _T("No underlying DC associated with wxBufferedDC (anymore)") );
  70
  71     m_dc->Blit( 0, 0, m_buffer.GetWidth(), m_buffer.GetHeight(), this, 0, 0 );
  72     m_dc = NULL;
  73 }
  74