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Cream of the Crop 1
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PROGRAM
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CBGRX100.ARJ
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P4PIXROW.C
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1992-04-10
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/**
** P4PIXROW.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 "p4.h"
#include "memfill.h"
#include "memcopy.h"
void _GrP4SetPixRow(long addr,int color,int width)
{
pixptr p = P_ADDRESS(CURC,addr);
int opr = C_OPER(color);
int plane,lmask,rmask;
if(width <= 0) return;
if((_GrP4DrawTable[opr] ^ (color &= C_SIGNIF)) == 0) return;
_ClrDir();
_ComputeMasks(addr,width,lmask,rmask);
if(CURC->gc_onscreen) {
_SetVideoColor(color,opr);
if(lmask) { _SetVGAWriteMask(lmask); (*p)++; p++; }
if(width) {
_SetVGAWriteMask(0xff);
if(opr == C_SET)
_RowSetB(VRAM,p,0,width);
else {
_SaveDS();
_RowCpyB(VRAM,p,p,width);
_RestoreDS();
}
p += width;
}
if(rmask) { _SetVGAWriteMask(rmask); (*p)++; }
return;
}
opr <<= 1;
for(plane = 4; --plane >= 0; color >>= 1) {
pixptr pp = p;
switch(opr | (color & 1)) {
case C_XOR2+1:
if(lmask) { *pp++ ^= lmask; }
if(width) { _RowSetXorB(MEM_X,pp,0xff,width); pp += width; }
if(rmask) { *pp ^= rmask; }
break;
case C_OR2+1:
case C_SET2+1:
if(lmask) { *pp++ |= lmask; }
if(width) { _RowSetB(MEM_1,pp,0xff,width); pp += width; }
if(rmask) { *pp |= rmask; }
break;
case C_AND2+0:
case C_SET2+0:
if(lmask) { *pp++ &= ~lmask; }
if(width) { _RowSetB(MEM_0,pp,0,width); pp += width; }
if(rmask) { *pp &= ~rmask; }
break;
}
p = (pixptr)((long)p + CURC->gc_planeoffset);
}
}