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dcbuffer.cpp
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2002-03-17
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/////////////////////////////////////////////////////////////////////////////
// Name: dcbuffer.cpp
// Purpose: wxBufferedDC class
// Author: Ron Lee <ron@debian.org>
// Modified by:
// Created: 16/03/02
// RCS-ID: $Id: dcbuffer.cpp,v 1.2 2002/03/17 07:38:01 RL Exp $
// Copyright: (c) Ron Lee
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "dcbuffer.h"
#endif
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/window.h"
#endif
#include "wx/dcbuffer.h"
// ==============================================================
// Double buffering helper.
// --------------------------------------------------------------
wxBufferedDC::wxBufferedDC( wxDC *dc, const wxBitmap &buffer )
: m_dc( dc )
, m_buffer( buffer )
{
SelectObject( m_buffer );
}
wxBufferedDC::wxBufferedDC( wxDC *dc, const wxSize &area )
: m_dc( dc )
, m_buffer( area.GetWidth(), area.GetHeight() )
{
SelectObject( m_buffer );
}
wxBufferedDC::~wxBufferedDC()
{
if( m_dc != 0 )
{
UnMask();
}
}
void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
{
wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
_T("wxBufferedDC already initialised") );
m_dc = dc;
m_buffer = buffer;
SelectObject( m_buffer );
}
void wxBufferedDC::Init( wxDC *dc, const wxSize &area )
{
wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
_T("wxBufferedDC already initialised") );
m_dc = dc;
m_buffer = wxBitmap( area.GetWidth(), area.GetHeight() );
SelectObject( m_buffer );
}
void wxBufferedDC::UnMask()
{
wxASSERT_MSG( m_dc != 0, _T("No low level DC associated with buffer (anymore)") );
m_dc->Blit( 0, 0, m_buffer.GetWidth(), m_buffer.GetHeight(), this, 0, 0 );
m_dc = 0;
}
// ==============================================================
// Double buffered PaintDC.
// --------------------------------------------------------------
wxBufferedPaintDC::wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer )
: m_paintdc( window )
{
window->PrepareDC( m_paintdc );
if( buffer != wxNullBitmap )
Init( &m_paintdc, buffer );
else
Init( &m_paintdc, window->GetClientSize() );
}
wxBufferedPaintDC::~wxBufferedPaintDC()
{
// We must UnMask here, else by the time the base class
// does it, the PaintDC will have already been destroyed.
UnMask();
}
// vi:sts=4:sw=4:et