/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * __XSAVESCREEN()/__XRESTSCREEN() functions
 *
 * Copyright 1999 Paul Tucker <ptucker@sympatico.ca>
 * www - http://www.harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

/*
 * The following parts are Copyright of the individual authors.
 * www - http://www.harbour-project.org
 *
 * Copyright 1999-2001 Viktor Szakats <viktor.szakats@syenar.hu>
 *    Rewritten in C
 *
 * See doc/license.txt for licensing terms.
 *
 */

#include "hbapigt.h"

/* NOTE: In original CA-Cl*pper 5.x these functions are written in Clipper
         [vszakats] */

static SHORT s_iRow;
static SHORT s_iCol;
static void * s_pBuffer = NULL;

void hb_conXSaveRestRelease( void )
{
   if( s_pBuffer )
   {
      hb_xfree( s_pBuffer );
      s_pBuffer = NULL;
   }
}

HB_FUNC( __XSAVESCREEN )
{
   ULONG ulSize;

   if( s_pBuffer != NULL )
      hb_xfree( s_pBuffer );

   hb_gtGetPos( &s_iRow, &s_iCol );

   hb_gtRectSize( 0, 0, hb_gtMaxRow(), hb_gtMaxCol(), &ulSize );
   s_pBuffer = hb_xgrab( ulSize );
   hb_gtSave( 0, 0, hb_gtMaxRow(), hb_gtMaxCol(), s_pBuffer );
}

/* NOTE: There's no check about the screen size on restore, so this will
         fail if the user has changed the screen resolution between calling 
         save and restore.
         [vszakats] */

HB_FUNC( __XRESTSCREEN )
{
   if( s_pBuffer != NULL )
   {
      hb_gtRest( 0, 0, hb_gtMaxRow(), hb_gtMaxCol(), s_pBuffer );
      hb_xfree( s_pBuffer );
      s_pBuffer = NULL;

      hb_gtSetPos( s_iRow, s_iCol );
   }
}