/*
 *  ReactOS kernel
 *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
 *
 *  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 of the License, 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 program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
/* $Id$
 *
 * PROJECT:         ReactOS user32.dll
 * FILE:            lib/user32/windows/input.c
 * PURPOSE:         Input
 * PROGRAMMER:      Casper S. Hornstrup (chorns@users.sourceforge.net)
 * UPDATE HISTORY:
 *      09-05-2001  CSH  Created
 */

/* INCLUDES ******************************************************************/

#include <user32.h>

#include <wine/debug.h>

/* FUNCTIONS *****************************************************************/

/*
 * @implemented
 */
BOOL STDCALL
CopyRect(LPRECT lprcDst, CONST RECT *lprcSrc)
{
  if(lprcDst == NULL || lprcSrc == NULL)
    return(FALSE);

  *lprcDst = *lprcSrc;
  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
EqualRect(
   CONST RECT *lprc1,
   CONST RECT *lprc2)
{
   if (lprc1 == NULL || lprc2 == NULL)
      return FALSE;

   return (lprc1->left == lprc2->left) && (lprc1->top == lprc2->top) &&
          (lprc1->right == lprc2->right) && (lprc1->bottom == lprc2->bottom);
}


/*
 * @implemented
 */
BOOL STDCALL
InflateRect(LPRECT rect, int dx, int dy)
{
  rect->left -= dx;
  rect->top -= dy;
  rect->right += dx;
  rect->bottom += dy;
  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
IntersectRect(LPRECT lprcDst,
	      CONST RECT *lprcSrc1,
	      CONST RECT *lprcSrc2)
{
  if (IsRectEmpty(lprcSrc1) || IsRectEmpty(lprcSrc2) ||
      lprcSrc1->left >= lprcSrc2->right ||
      lprcSrc2->left >= lprcSrc1->right ||
      lprcSrc1->top >= lprcSrc2->bottom ||
      lprcSrc2->top >= lprcSrc1->bottom)
    {
      SetRectEmpty(lprcDst);
      return(FALSE);
    }
  lprcDst->left = max(lprcSrc1->left, lprcSrc2->left);
  lprcDst->right = min(lprcSrc1->right, lprcSrc2->right);
  lprcDst->top = max(lprcSrc1->top, lprcSrc2->top);
  lprcDst->bottom = min(lprcSrc1->bottom, lprcSrc2->bottom);
  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
IsRectEmpty(CONST RECT *lprc)
{
  return((lprc->left >= lprc->right) || (lprc->top >= lprc->bottom));
}


/*
 * @implemented
 */
BOOL STDCALL
OffsetRect(LPRECT rect, int dx, int dy)
{
  if(rect == NULL)
    return(FALSE);

  rect->left += dx;
  rect->top += dy;
  rect->right += dx;
  rect->bottom += dy;
  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
PtInRect(CONST RECT *lprc, POINT pt)
{
  return((pt.x >= lprc->left) && (pt.x < lprc->right) &&
	 (pt.y >= lprc->top) && (pt.y < lprc->bottom));
}

BOOL STDCALL
SetRect(LPRECT lprc, int xLeft, int yTop, int xRight, int yBottom)
{
  lprc->left = xLeft;
  lprc->top = yTop;
  lprc->right = xRight;
  lprc->bottom = yBottom;
  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
SetRectEmpty(LPRECT lprc)
{
  lprc->left = lprc->right = lprc->top = lprc->bottom = 0;
  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
SubtractRect(LPRECT lprcDst, CONST RECT *lprcSrc1, CONST RECT *lprcSrc2)
{
  RECT tempRect;

  if(lprcDst == NULL || lprcSrc1 == NULL || lprcSrc2 == NULL)
    return(FALSE);

  CopyRect(lprcDst, lprcSrc1);

  if(!IntersectRect(&tempRect, lprcSrc1, lprcSrc2))
    return(TRUE);

  if (EqualRect(&tempRect, lprcDst))
  {
    SetRectEmpty(lprcDst);
    return FALSE;
  }
  if(lprcDst->top == tempRect.top && lprcDst->bottom == tempRect.bottom)
  {
    if(lprcDst->left == tempRect.left)
      lprcDst->left = tempRect.right;
    else if(lprcDst->right == tempRect.right)
      lprcDst->right = tempRect.left;
  }
  else if(lprcDst->left == tempRect.left && lprcDst->right == tempRect.right)
  {
    if(lprcDst->top == tempRect.top)
      lprcDst->top = tempRect.bottom;
    else if(lprcDst->right == tempRect.right)
      lprcDst->right = tempRect.left;
  }

  return(TRUE);
}


/*
 * @implemented
 */
BOOL STDCALL
UnionRect(LPRECT lprcDst, CONST RECT *lprcSrc1, CONST RECT *lprcSrc2)
{
  if (IsRectEmpty(lprcSrc1))
    {
      if (IsRectEmpty(lprcSrc2))
	{
	  SetRectEmpty(lprcDst);
	  return(FALSE);
	}
      else
	{
	  *lprcDst = *lprcSrc2;
	}
    }
  else
    {
      if (IsRectEmpty(lprcSrc2))
	{
	  *lprcDst = *lprcSrc1;
	}
      else
	{
	  lprcDst->left = min(lprcSrc1->left, lprcSrc2->left);
	  lprcDst->top = min(lprcSrc1->top, lprcSrc2->top);
	  lprcDst->right = max(lprcSrc1->right, lprcSrc2->right);
	  lprcDst->bottom = max(lprcSrc1->bottom, lprcSrc2->bottom);
	}
    }
  return(TRUE);
}
