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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <draw.h>
- static
- uint8_t*
- addcoord(uint8_t *p, int oldx, int newx)
- {
- int dx;
- dx = newx-oldx;
- /* does dx fit in 7 signed bits? */
- if((unsigned)(dx - -0x40) <= 0x7F)
- *p++ = dx&0x7F;
- else{
- *p++ = 0x80 | (newx&0x7F);
- *p++ = newx>>7;
- *p++ = newx>>15;
- }
- return p;
- }
- static
- void
- dopoly(int cmd, Image *dst, Point *pp, int np, int end0, int end1, int radius, Image *src, Point *sp, Drawop op)
- {
- uint8_t *a, *t, *u;
- int i, ox, oy;
- if(np == 0)
- return;
- t = malloc(np*2*3);
- if(t == nil)
- return;
- u = t;
- ox = oy = 0;
- for(i=0; i<np; i++){
- u = addcoord(u, ox, pp[i].x);
- ox = pp[i].x;
- u = addcoord(u, oy, pp[i].y);
- oy = pp[i].y;
- }
- _setdrawop(dst->display, op);
- a = bufimage(dst->display, 1+4+2+4+4+4+4+2*4+(u-t));
- if(a == 0){
- free(t);
- fprint(2, "image poly: %r\n");
- return;
- }
- a[0] = cmd;
- BPLONG(a+1, dst->id);
- BPSHORT(a+5, np-1);
- BPLONG(a+7, end0);
- BPLONG(a+11, end1);
- BPLONG(a+15, radius);
- BPLONG(a+19, src->id);
- BPLONG(a+23, sp->x);
- BPLONG(a+27, sp->y);
- memmove(a+31, t, u-t);
- free(t);
- }
- void
- poly(Image *dst, Point *p, int np, int end0, int end1, int radius, Image *src, Point sp)
- {
- dopoly('p', dst, p, np, end0, end1, radius, src, &sp, SoverD);
- }
- void
- polyop(Image *dst, Point *p, int np, int end0, int end1, int radius, Image *src, Point sp, Drawop op)
- {
- dopoly('p', dst, p, np, end0, end1, radius, src, &sp, op);
- }
- void
- fillpoly(Image *dst, Point *p, int np, int wind, Image *src, Point sp)
- {
- dopoly('P', dst, p, np, wind, 0, 0, src, &sp, SoverD);
- }
- void
- fillpolyop(Image *dst, Point *p, int np, int wind, Image *src, Point sp, Drawop op)
- {
- dopoly('P', dst, p, np, wind, 0, 0, src, &sp, op);
- }
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