+void wxBufferedDC::UnMask()
+{
+ wxCHECK_RET( m_dc, wxT("no underlying wxDC?") );
+ wxASSERT_MSG( m_buffer && m_buffer->IsOk(), wxT("invalid backing store") );
+
+ wxCoord x = 0,
+ y = 0;
+
+ if ( m_style & wxBUFFER_CLIENT_AREA )
+ GetDeviceOrigin(&x, &y);
+
+ // avoid blitting too much: if we were created for a bigger bitmap (and
+ // reused for a smaller one later) we should only blit the real bitmap area
+ // and not the full allocated back buffer
+ int widthDC,
+ heightDC;
+
+ m_dc->GetSize(&widthDC, &heightDC);
+
+ int widthBuf = m_buffer->GetWidth(),
+ heightBuf = m_buffer->GetHeight();
+
+ m_dc->Blit(0, 0,
+ wxMin(widthDC, widthBuf), wxMin(heightDC, heightBuf),
+ this,
+ -x, -y);
+ m_dc = NULL;
+
+ if ( m_style & wxBUFFER_USES_SHARED_BUFFER )
+ wxSharedDCBufferManager::ReleaseBuffer(m_buffer);
+}