| #include <u.h> |
| #include <libc.h> |
| #include <draw.h> |
| |
| static |
| uchar* |
| addcoord(uchar *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) |
| { |
| uchar *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); |
| } |