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Код


afx_msg void
FrameDialog::OnPaint( )
{    
    //Handle frame resizing. If main window was resized, back buffer will
    //also be resized
    {
        RECT rect;
        this->GetWindowRect( &rect );

        //If sizes of window was changed, recreate back buffer
        if (    rect.right - rect.left != m_BackBuffer.Width() || 
                rect.bottom - rect.top != m_BackBuffer.Height()        )
        {
            m_BackBuffer.Destroy( );
            m_BackBuffer.Create( rect.right - rect.left, rect.bottom - rect.top );
        }
    }

    
    bool bDone = m_BackBuffer.BeginUsing( );
    if ( bDone )
    {
        CPaintDC dc( this );

        
        //If no frame to draw, print "No Frame" to back buffer
        if ( m_pImg == NULL || m_pImg->IsNull() )
        {
            RECT rect;
            this->GetWindowRect( &rect );
            ::OffsetRect( &rect, -rect.left, -rect.top );

            CString strMsg = _T("No Frame");
            COLORREF colorOld = m_BackBuffer.DC()->SetTextColor( RGB(255, 255, 200) );
            m_BackBuffer.DC()->DrawText( strMsg, &rect, DT_SINGLELINE|DT_CENTER|DT_VCENTER );
            //restore previous color
            m_BackBuffer.DC()->SetTextColor( colorOld );
        }
        else
            this->DrawFrameToBackBuffer( );

        

        RECT rect;
        this->GetWindowRect( &rect );
        
        
        //Present back buffer to front buffer (screen)
        dc.BitBlt(    0, 0, rect.right - rect.left, rect.bottom - rect.top,
                        m_BackBuffer.DC(),
                        0, 0, SRCCOPY );

        
        //Clean back buffer
        m_BackBuffer.Clean( RGB(0, 0, 0) );
    }
    //Release device context of back buffer.
    m_BackBuffer.EndUsing( );
}

Код


bool
BackBuffer::BeginUsing( )
{
    //m_Buffer - is CImage class object
    if ( m_Buffer.IsNull() )
        return false;

    //m_pCDC - is a pointer to object of class CDC
    m_pCDC = CDC::FromHandle( m_Buffer.GetDC() );
    return true;
}