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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) msflag =
- (*_GrMouseBlock)(src,x1,y1,(x1 + x2 - x),(y1 + y2 - y)) |
- (*_GrMouseBlock)(dst,x,y,x2,y2);
- _GrPixCopy(dst,PIX_ADDR(dst,x,y),
- src,PIX_ADDR(src,x1,y1),
- (x2 - x + 1),
- (y2 - y + 1),
- oper
- );
- if(msflag) (*_GrMouseUnBlock)();
- }
-