curs8.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          */
/*                                                                       */
/*      CURS8.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the DefineCursor 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"
#include "metmacs3.h"

/* Function DefineCursor loads the specified cursor number, CURSORNBR (0-7),
with the user specifed cursor mask, cursor image, and center spot X,Y.
If the image pointers are NULL, then the original pre-defined data for the
specified cursor number is re-loaded. */

void DefineCursor (int argCNBR, int argHOTX, int argHOTY,
		     image *argBACKIMG, image *argFOREIMG)
{
#define allowCurSize 32
	void HideCursor(void);
	void CursorStyle(int argCURNO);
	void ShowCursor(void);
	void nuResume(grafMap *argGRAFMAP);
	short grafErrValue;	/* error value */

	M_PAUSE(cursBlit.blitDmap);	/* pause cursor */
	HideCursor();	/* Remove the cursor if visible */
	if (argBACKIMG == 0)	/* is background image pointer null? */
	{	/* load args from pre-defined cursors table */
		argBACKIMG = (image *) DefCursorTable[argCNBR][0];
		argFOREIMG = (image *) DefCursorTable[argCNBR][1];
		argHOTX = (int) DefCursorTable[argCNBR][2];
		argHOTY = (int) DefCursorTable[argCNBR][3];
	}

	if (argBACKIMG->imWidth > allowCurSize)	/* can we handle this size of cursor */
	{
		argBACKIMG->imWidth = allowCurSize;
		grafErrValue = c_DefineCu +  c_BadCursSiz;
		nuGrafErr(grafErrValue);	/* report error */
		goto DC900;
	}
	CursorTable[argCNBR][0] = (long)argBACKIMG;

	if (argFOREIMG->imWidth > allowCurSize)	/* can we handle this size of cursor */
	{
		argFOREIMG->imWidth = allowCurSize;
		grafErrValue = c_DefineCu +  c_BadCursSiz;
		nuGrafErr(grafErrValue);	/* report error */
		goto DC900;
	}
	CursorTable[argCNBR][1] = (long) argFOREIMG;

	CursorTable[argCNBR][2] = argHOTX;	/* save new hot spots */
	CursorTable[argCNBR][3] = argHOTY;
	CursorStyle(-1);	/* re-cursorstyle in case the current cursor was re-defined */

DC900:
	ShowCursor();	/* Restore cursor if visible */
	nuResume(cursBlit.blitDmap);
	return;
}