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Cream of the Crop 1
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PROGRAM
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DJLGR106.ARJ
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GRAPHICS.C
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1991-03-06
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/* This is file GRAPHICS.C */
/*
** Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
**
** This file is distributed under the terms listed in the document
** "copying.dj", available from DJ Delorie at the address above.
** A copy of "copying.dj" 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.dj".
**
** This file is distributed WITHOUT ANY WARRANTY; without even the implied
** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "sys/registers.h"
unsigned _GrMaxX;
unsigned _GrMaxY;
unsigned _GrSizeX;
unsigned _GrSizeY;
GrPlot(x, y, c)
{
register unsigned char *a;
if ((x<0) || (x>_GrMaxX) || (y<0) || (y>_GrMaxY))
return;
a = (unsigned char *)(0xd0000000+((x+y*_GrSizeX)&0xfffff));
if (c & 0x100)
*a ^= c;
else
*a = c;
}
GrPixel(x, y)
{
if ((x<0) || (x>_GrMaxX) || (y<0) || (y>_GrMaxY))
return 0;
return *(unsigned char *)(0xd0000000+((x+y*_GrSizeX)&0xfffff));
}
GrPlot3d(x, y, c)
{
register unsigned char *a;
if ((x<0) || (x>_GrMaxX) || (y<0) || (y>_GrMaxY))
return;
a = (unsigned char *)(0xd0000000+((x+y*_GrSizeX)&0xfffff));
if ((*a < c) || (c<0xc0))
*a = c;
}
GrMaxX()
{
return _GrMaxX;
}
GrMaxY()
{
return _GrMaxY;
}
GrSizeX()
{
return _GrSizeX;
}
GrSizeY()
{
return _GrSizeY;
}