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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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#include <i86.h>
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#include <graph.h>
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#include "driver.h"
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#define NULL 0
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#define M_RIGHTBUTT 0x8
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#define M_LEFTBUTT 0x2
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#define M_MOTION 0x1
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static int xdispsize, ydispsize;
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static int crad;
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#define right_button (mouse_event & M_RIGHTBUTT)
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#define left_button (mouse_event & M_LEFTBUTT)
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static int mouse_event = 0;
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static int mouse_xpos = -1;
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static int mouse_ypos = -1;
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#pragma off (check_stack)
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static void _loadds far mouse_handler (int max, int mcx, int mdx)
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{
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#pragma aux mouse_handler parm [EAX] [ECX] [EDX]
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mouse_event = max;
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mouse_xpos = mcx;
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mouse_ypos = mdx;
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}
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#pragma on (check_stack)
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static void
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move_cursor(newx, newy) /* move cursor to new position */
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int newx, newy;
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{
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extern char *bmalloc();
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static char *imp = NULL;
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static int curx = -1, cury = -1;
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#define xcmin (curx-crad<0 ? 0 : curx-crad)
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#define ycmin (cury-crad<0 ? 0 : cury-crad)
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#define xcmax (curx+crad>=xdispsize ? xdispsize-1 : curx+crad)
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#define ycmax (cury+crad>=ydispsize ? ydispsize-1 : cury+crad)
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if (imp == NULL &&
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(imp = bmalloc(_imagesize(0,0,2*crad+1,2*crad+1))) == NULL) {
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eputs("out of memory in move_cursor");
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quit(1);
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}
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if (curx >= 0 & cury >= 0) /* clear old cursor */
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_putimage(xcmin, ycmin, imp, _GPSET);
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/* record new position */
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curx = newx; cury = newy;
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if (curx < 0 | cury < 0)
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return; /* no cursor */
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/* save under new cursor */
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_getimage(xcmin, ycmin, xcmax, ycmax, imp);
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/* draw new cursor */
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_setcolor(1);
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_rectangle(_GFILLINTERIOR, xcmin, cury-1, xcmax, cury+1);
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_rectangle(_GFILLINTERIOR, curx-1, ycmin, curx+1, ycmax);
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_setcolor(0);
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_moveto(xcmin+1, cury);
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_lineto(xcmax-1, cury);
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_moveto(curx, ycmin+1);
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_lineto(curx, ycmax-1);
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#undef xcmin
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#undef ycmin
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#undef xcmax
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#undef ycmax
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}
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static int
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ms_getcur(xp, yp) /* get mouse cursor position */
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int *xp, *yp;
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{
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/* show cursor */
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move_cursor(mouse_xpos, mouse_ypos);
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/* update cursor until button pressed */
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do {
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mouse_event = 0;
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while( !mouse_event )
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if (kbhit())
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switch (getch()) {
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case MB1:
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mouse_event = M_LEFTBUTT;
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break;
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case MB2:
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case MB3:
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mouse_event = M_RIGHTBUTT;
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break;
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default:
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mouse_event = M_RIGHTBUTT | M_LEFTBUTT;
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break;
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}
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if (mouse_event & M_MOTION)
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move_cursor(mouse_xpos, mouse_ypos);
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} while (!(mouse_event & (M_RIGHTBUTT|M_LEFTBUTT)));
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/* clear cursor */
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move_cursor(-1, -1);
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/* compute final position */
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if (mouse_xpos < 0 | mouse_ypos < 0)
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return(ABORT);
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*xp = mouse_xpos;
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*yp = ydispsize-1 - mouse_ypos;
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switch (mouse_event) {
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case M_LEFTBUTT:
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case M_LEFTBUTT|M_MOTION:
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return(MB1);
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case M_RIGHTBUTT:
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case M_RIGHTBUTT|M_MOTION:
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return(MB2);
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}
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return(ABORT);
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}
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void
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ms_gcinit( dp )
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struct driver *dp;
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{
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struct SREGS sregs;
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union REGS inregs, outregs;
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int far *ptr;
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int (far *function_ptr)();
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segread(&sregs);
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/* check for mouse driver */
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inregs.w.ax = 0;
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int386 (0x33, &inregs, &outregs);
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if( outregs.w.ax != -1 ) {
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dp->getcur = NULL;
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return;
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}
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/* get relevant parameters */
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xdispsize = dp->xsiz;
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ydispsize = dp->ysiz;
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crad = dp->ysiz/40;
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/* set screen limits */
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inregs.w.ax = 0x7; /* horizontal resolution */
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inregs.w.cx = 0;
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inregs.w.dx = xdispsize-1;
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int386x( 0x33, &inregs, &outregs, &sregs );
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inregs.w.ax = 0x8; /* vertical resolution */
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inregs.w.cx = 0;
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inregs.w.dx = ydispsize-1;
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int386x( 0x33, &inregs, &outregs, &sregs );
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/* install watcher */
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inregs.w.ax = 0xC;
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inregs.w.cx = M_RIGHTBUTT | M_LEFTBUTT | M_MOTION;
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function_ptr = mouse_handler;
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inregs.x.edx = FP_OFF( function_ptr );
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sregs.es = FP_SEG( function_ptr );
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int386x( 0x33, &inregs, &outregs, &sregs );
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dp->getcur = ms_getcur;
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}
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void
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ms_gcdone( dp )
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struct driver *dp;
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{
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union REGS inregs, outregs;
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if (dp->getcur != ms_getcur)
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return; /* not installed */
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dp->getcur = NULL;
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/* uninstall watcher */
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inregs.w.ax = 0;
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int386 (0x33, &inregs, &outregs);
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}
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