+/////////////////////////////////////////////////////////////////////////////
+// Name: dcbuffer.cpp
+// Purpose: wxBufferedDC class
+// Author: Ron Lee <ron@debian.org>
+// Modified by:
+// Created: 16/03/02
+// RCS-ID: $Id$
+// Copyright: (c) Ron Lee
+// Licence: wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+
+#ifdef __GNUG__
+ #pragma implementation "dcbuffer.h"
+#endif
+
+#ifdef __BORLANDC__
+ #pragma hdrstop
+#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
projects / wxWidgets.git / commitdiff
