list0.c

nucleus 文件系统,内核和彩色图形系统,在小系统上非常好用

/*************************************************************************/
/*                                                                       */
/*         Copyright (c) 1997 - 1999 Accelerated Technology, Inc.        */
/*                                                                       */
/* PROPRIETARY RIGHTS of Accelerated Technology are involved in the      */
/* subject matter of this material.  All manufacturing, reproduction,    */
/* use, and sales rights pertaining to this subject matter are governed  */
/* by the license agreement.  The recipient of this software implicitly  */
/* accepts the terms of the license.                                     */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FILE NAME                                            VERSION          */
/*                                                                       */
/*      LIST0.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the mwRectInList function.                    */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      Robert G. Burrill, Accelerated Technology, Inc.                  */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         NAME            DATE                    REMARKS               */
/*                                                                       */
/*                                                                       */
/*************************************************************************/

#include "meta_wnd.h"
#include "metconst.h"    /* MetaWINDOW Constant & Stucture Definitions */
#include "metports.h"    /* MetaWINDOW Port & Bitmap Definitions */
#include "grafdata.h"


/* This function replaces the filler during "PtIn/On" type operations.  It
obtains the rectangle to test against from grafdata, and places the result
there. Since a given function may call the filler multiple times, the filler
will increment the return value upon a "hit". A 0 is used to indicate the
starting value of "not in list". Should any part of the rectangle be in the
list, a hit is tallied. Notice that the test logic is backwards, ie it's
more likely to NOT be in the rect, so we try to stop testing soonest. */

void mwRectInList(blitRcd *FillRcd)
{
	int numRect;
	rect *pntrRect;

	if(PtRslt == 1) return; /* check hit counter; return if already found one */

	numRect = FillRcd->blitCnt;	/* how many rects in list */
	pntrRect = (rect *) FillRcd->blitList;	/* get pointer to rect list */

	while (numRect > 0)	/* skip if list is empty */
	{
		numRect--;
		if((pntrRect->Ymin < PtTstR.Ymax) && (pntrRect->Ymax > PtTstR.Ymin) &&
			(pntrRect->Xmin < PtTstR.Xmax) && (pntrRect->Xmax > PtTstR.Xmin))
		{
			PtRslt = 1;	/* set hit counter */
			return;
		}

		pntrRect++;	/* check next rectangle in list */
	}

	return;
}