gui_setcliprect.c

ucgui的3.98版本的源代码

/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUI_SetClipRect.c
Purpose     : Implementation of GUI_SetClipRect
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h>
#include "GUI.h"

#if GUI_WINSUPPORT
  #include "WM.h"
#endif

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI_SetClipRect
*
* Purpose:
*   Sets the rectangle used for clipping.
*
* Parameter:
*   pRect - Points to the rectangle to be used for clipping. If the WM
*           is used, the pointer needs to remain valid during the given
*           rectangle should be used for clipping.
*/
const GUI_RECT * GUI_SetClipRect(const GUI_RECT * pRect) {
  const GUI_RECT * pOldRect;
  GUI_LOCK();
  #if GUI_WINSUPPORT
    pOldRect = WM_SetUserClipRect(pRect);
  #else
    pOldRect = NULL;
    {
      GUI_RECT Rect;
      if (!pRect) {
        Rect.x0 = -4096;
        Rect.y0 = -4096;
        Rect.x1 =  4096;
        Rect.y1 =  4096;
        pRect = &Rect;
      }
      LCD_SetClipRectEx(pRect);
    }
  #endif
  GUI_UNLOCK();
  return pOldRect;
}

/*************************** End of file ****************************/