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p4pixblk.c
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1993-12-06
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/**
** P4PIXBLK.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 _GrP4SetPixBlock(long addr,int color,int width,int height)
{
pixptr p = P_ADDRESS(CURC,addr);
int opr = C_OPER(color);
int offs = CURC->gc_lineoffset;
int plane,lmask,rmask;
if((width <= 0) || (height <= 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);
_ColSetXorB(VLEFT,p,offs,0,height);
p++;
}
if(width) {
_SetVGAWriteMask(0xff);
plane = offs - width;
if(opr == C_SET)
_BlkSetB(VBODY,p,plane,0,width,height);
else {
_SaveDS();
_BlkCpyB(VBODY,p,plane,p,plane,width,height);
_RestoreDS();
}
p += width;
}
if(rmask) {
_SetVGAWriteMask(rmask);
_ColSetXorB(VRIGHT,p,offs,0,height);
}
return;
}
opr <<= 1;
for(plane = 4; --plane >= 0; color >>= 1) {
pixptr pp = p;
switch(opr | (color & 1)) {
case C_XOR2+1:
if(lmask) {
_ColSetXorB(MLEFT_X,pp,offs,lmask,height);
pp++;
}
if(width) {
_BlkSetXorB(MBODY_X,pp,(offs - width),0xff,width,height);
pp += width;
}
if(rmask) {
_ColSetXorB(MRIGHT_X,pp,offs,rmask,height);
}
break;
case C_OR2+1:
case C_SET2+1:
if(lmask) {
_ColSetOrB(MLEFT_1,pp,offs,lmask,height);
pp++;
}
if(width) {
_BlkSetB(MBODY_1,pp,(offs - width),0xff,width,height);
pp += width;
}
if(rmask) {
_ColSetOrB(MRIGHT_1,pp,offs,rmask,height);
}
break;
case C_AND2+0:
case C_SET2+0:
if(lmask) {
_ColSetAndB(MLEFT_0,pp,offs,~lmask,height);
pp++;
}
if(width) {
_BlkSetB(MBODY_0,pp,(offs - width),0,width,height);
pp += width;
}
if(rmask) {
_ColSetAndB(MRIGHT_0,pp,offs,~rmask,height);
}
break;
}
p = (pixptr)((long)p + CURC->gc_planeoffset);
}
}