graf2.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          */
/*                                                                       */
/*      GRAF2.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the GrafQueue and GrafPool functions.         */
/*                                                                       */
/* 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"

/* Local functions  */
void GrafFree(void *freePtr);
point *GrafAlloc(int memSize);


/* Function GrafQueue sets the size (in event queue elements) that will be
allocated for the event queue if/when it is enabled. */


void GrafQueue(int argMSGCNT)
{

	q_Size = argMSGCNT;
	return;
}


/* Function GrafPool sets the size (in bytes) that will be allocated for
the memory pool upon the InitGraphics() call, or if already allocated,
frees the current pool and allocates a new one of requested size. */

int GrafPool (unsigned argPOOLSIZE)
{
	short grafErrValue;

	if (gFlags & gfGrafInit)	/* have we already InitGraphics()'d ? */
	{	/* yes, re-allocate the pool */
		GrafFree(mpWorkSpace);	/* free current pool memory */
		mpWorkSpace = (byte *) GrafAlloc(argPOOLSIZE);	/* allocate new pool memory */

		if (mpWorkSpace == NULL)
		{	/* can't allocate it */
			grafErrValue = c_GrafPool + c_OutofMem;
			nuGrafErr(grafErrValue);
			return(-1);
		}

      	mpWorkEnd = (byte *)((unsigned)mpWorkSpace + argPOOLSIZE);
	}

	/* no, set the pool size to allocate */
    mpSize = argPOOLSIZE;
	return(0);
}