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p8pixrow.c
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1993-12-06
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/**
** P8PIXROW.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 "p8.h"
#include "memfill.h"
void _GrP8SetPixRow(long addr,int color,int width)
{
int oper = C_OPER(color);
pixptr p;
if(width <= 0) return;
if((_GrP8DrawTable[oper] ^ (color &= C_SIGNIF)) == 0) return;
_ClrDir();
if(CURC->gc_onscreen && _GrP8UsePlanarMode) {
if((oper == C_SET) && (width >= 32)) {
int rmask = ((int)addr + width) & 3;
int lmask = (int)addr & 3;
PLANAR_MODE_ON();
p = P_XADDRESS(CURC,addr);
if(lmask) {
_SetVGAPlaneMask(_GrP8LmaskTable[lmask]);
*p++ = color;
width -= (4 - lmask);
}
width >>= 2;
_SetVGAPlaneMask(0xff);
_RowSetB(FASTROW,p,color,width);
if(rmask) {
_SetVGAPlaneMask(_GrP8RmaskTable[rmask]);
*(p + width) = color;
}
return;
}
PLANAR_MODE_OFF();
}
p = P_ADDRESS(CURC,addr);
if(((int)addr | width) & 1) switch(oper) {
case C_XOR: _RowSetXorB(XB,p,color,width); return;
case C_OR: _RowSetOrB(OB,p,color,width); return;
case C_AND: _RowSetAndB(AB,p,color,width); return;
default: _RowSetB(WB,p,color,width); return;
}
width >>= 1;
color |= (color << 8);
switch(oper) {
case C_XOR: _RowSetXorW(XW,p,color,width); return;
case C_OR: _RowSetOrW(OW,p,color,width); return;
case C_AND: _RowSetAndW(AW,p,color,width); return;
default: _RowSetW(WW,p,color,width); return;
}
}