blob: 96effaec83a4f9c1446f712c2caeeb0a5bd2e7ea [file] [log] [blame]
#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);
}