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swpixrd.c
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1993-12-06
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/**
** SWPIXRD.C
**
** Copyright (C) 1992, Csaba Biegl
** 820 Stirrup Dr, Nashville, TN, 37221
** csaba@vuse.vanderbilt.edu
**
** This file is distributed under the terms listed in the document
** "copying.cb", available from the author at the address above.
** A copy of "copying.cb" should accompany this file; if not, a copy
** should be available from where this file was obtained. This file
** may not be distributed without a verbatim copy of "copying.cb".
** You should also have received a copy of the GNU General Public
** License along with this program (it is in the file "copying");
** if not, write to the Free Software Foundation, Inc., 675 Mass Ave,
** Cambridge, MA 02139, USA.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**/
#include "grx.h"
#include "libgrx.h"
#define PROTO GC *,long
extern int _GrVoidDriver(PROTO);
static int (*readpixeltab[])(PROTO) = {
_GrVoidDriver,
USE_DRIVER_1(_GrP1ReadPixel),
USE_DRIVER_4(_GrP4ReadPixel),
USE_DRIVER_8(_GrP8ReadPixel),
USE_DRIVER_H(_GrPHReadPixel),
USE_DRIVER_X(_GrPXReadPixel),
USE_DRIVER_I(_GrPIReadPixel),
USE_DRIVER_S(_GrPSReadPixel)
};
static int readpixel(GC *cxt,long addr)
{
_GrReadPixel = readpixeltab[_GrDriverIndex];
_GrResetValues[ReadPixelIndex] = (handler)readpixel;
_GrResetAddresses[ReadPixelIndex] = (handler *)(&_GrReadPixel);
return((*_GrReadPixel)(cxt,addr));
}
int (*_GrReadPixel)(PROTO) = readpixel;