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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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static
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uchar*
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addcoord(uchar *p, int oldx, int newx)
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{
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	int dx;
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	dx = newx-oldx;
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	/* does dx fit in 7 signed bits? */
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	if((unsigned)(dx - -0x40) <= 0x7F)
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		*p++ = dx&0x7F;
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	else{
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		*p++ = 0x80 | (newx&0x7F);
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		*p++ = newx>>7;
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		*p++ = newx>>15;
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	}
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	return p;
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}
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static
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void
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dopoly(int cmd, Image *dst, Point *pp, int np, int end0, int end1, int radius, Image *src, Point *sp, Drawop op)
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{
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	uchar *a, *t, *u;
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	int i, ox, oy;
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	if(np == 0)
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		return;
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	t = malloc(np*2*3);
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	if(t == nil)
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		return;
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	u = t;
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	ox = oy = 0;
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	for(i=0; i<np; i++){
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		u = addcoord(u, ox, pp[i].x);
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		ox = pp[i].x;
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		u = addcoord(u, oy, pp[i].y);
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		oy = pp[i].y;
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	}
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	_setdrawop(dst->display, op);
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	a = bufimage(dst->display, 1+4+2+4+4+4+4+2*4+(u-t));
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	if(a == 0){
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		free(t);
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		fprint(2, "image poly: %r\n");
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		return;
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	}
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	a[0] = cmd;
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	BPLONG(a+1, dst->id);
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	BPSHORT(a+5, np-1);
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	BPLONG(a+7, end0);
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	BPLONG(a+11, end1);
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	BPLONG(a+15, radius);
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	BPLONG(a+19, src->id);
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	BPLONG(a+23, sp->x);
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	BPLONG(a+27, sp->y);
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	memmove(a+31, t, u-t);
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	free(t);
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}
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void
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poly(Image *dst, Point *p, int np, int end0, int end1, int radius, Image *src, Point sp)
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{
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	dopoly('p', dst, p, np, end0, end1, radius, src, &sp, SoverD);
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}
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void
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polyop(Image *dst, Point *p, int np, int end0, int end1, int radius, Image *src, Point sp, Drawop op)
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{
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	dopoly('p', dst, p, np, end0, end1, radius, src, &sp, op);
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}
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void
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fillpoly(Image *dst, Point *p, int np, int wind, Image *src, Point sp)
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{
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	dopoly('P', dst, p, np, wind, 0, 0, src, &sp, SoverD);
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}
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void
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fillpolyop(Image *dst, Point *p, int np, int wind, Image *src, Point sp, Drawop op)
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{
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	dopoly('P', dst, p, np, wind, 0, 0, src, &sp, op);
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}