getp0.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.                                     */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FLLE NAME                                            VERSION          */
/*                                                                       */
/*      SETP0.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the mwGPA function.	                         */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      Giac Dinh, 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"
#include "metmacs3.h"

/* Module GETP is a special case optimization for GetPixel, 8-bit-per-pixel
   memory source.  */

int mwGPA(int gblX, int gblY, grafMap *getpBmap)
{
#define egaCntlrP1 (egaCntlr + 1)
	void nuResume(grafMap *argGRAFMAP);
	byte *pixelPtr;
	int pixelValue;


	/* check if off bitmap */
	if ((gblX < 0) || (gblY < 0) || (gblX >= getpBmap->pixWidth) ||
		(gblY >= getpBmap->pixHeight)) return(0);

	M_PAUSE(getpBmap);	/* lock grafMap */

	if( (gblY < getpBmap->mapWinYmin[0]) ||
		(gblY > getpBmap->mapWinYmax[0] ) )
		getpBmap->mapBankMgr(getpBmap, gblY, -1);

	pixelPtr = (byte *) (*(getpBmap->mapTable[0] + gblY)) + gblX;
	pixelValue = *pixelPtr;
	nuResume(getpBmap);
	return(pixelValue);
}