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bitblt.c
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1993-12-06
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/**
** BITBLT.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"
#include "clipping.h"
void GrBitBlt(GrContext *dst,int x,int y,
GrContext *src,int x1,int y1,int x2,int y2,int oper)
{
int oldx,oldy;
int msflag = FALSE;
if(dst == NULL) dst = CURC;
if(src == NULL) src = CURC;
SORT2(x1,x2);
SORT2(y1,y2);
oldx = x1;
oldy = y1;
CLIPBOXTOCONTEXT(src,x1,y1,x2,y2);
x += (x1 - oldx);
y += (y1 - oldy);
x2 += ((oldx = x) - x1);
y2 += ((oldy = y) - y1);
CLIPBOX(dst,x,y,x2,y2);
x1 += (x - oldx);
y1 += (y - oldy);
if(_GrMouseDrawn) {
GrContext *cxt = NULL;
int mx1,my1,mx2,my2;
if(src->gc_onscreen) {
cxt = src->gc_root ? src->gc_root : src;
mx1 = x1 + src->gc_xoffset;
my1 = y1 + src->gc_yoffset;
mx2 = mx1 + x2 - x;
my2 = my1 + y2 - y;
}
if(dst->gc_onscreen) {
cxt = dst->gc_root ? dst->gc_root : dst;
mx1 = MIN(mx1,x + dst->gc_xoffset);
my1 = MIN(my1,y + dst->gc_yoffset);
mx2 = MAX(mx2,x2 + dst->gc_xoffset);
my2 = MAX(my2,y2 + dst->gc_yoffset);
}
if(cxt) msflag = (*_GrMouseBlock)(cxt,mx1,my1,mx2,my2);
}
_GrPixCopy(dst,PIX_ADDR(dst,x,y),
src,PIX_ADDR(src,x1,y1),
(x2 - x + 1),
(y2 - y + 1),
oper
);
if(msflag) (*_GrMouseUnBlock)(msflag);
}