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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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enum
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{
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	Max = 100
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};
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Point
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string(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s)
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{
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	return _string(dst, pt, src, sp, f, s, nil, 1<<24, dst->clipr, nil, ZP, SoverD);
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}
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Point
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stringop(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, Drawop op)
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{
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	return _string(dst, pt, src, sp, f, s, nil, 1<<24, dst->clipr, nil, ZP, op);
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}
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Point
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stringn(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, int len)
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{
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	return _string(dst, pt, src, sp, f, s, nil, len, dst->clipr, nil, ZP, SoverD);
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}
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Point
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stringnop(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, int len, Drawop op)
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{
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	return _string(dst, pt, src, sp, f, s, nil, len, dst->clipr, nil, ZP, op);
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}
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Point
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runestring(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r)
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{
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	return _string(dst, pt, src, sp, f, nil, r, 1<<24, dst->clipr, nil, ZP, SoverD);
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}
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Point
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runestringop(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r, Drawop op)
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{
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	return _string(dst, pt, src, sp, f, nil, r, 1<<24, dst->clipr, nil, ZP, op);
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}
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Point
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runestringn(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r, int len)
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{
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	return _string(dst, pt, src, sp, f, nil, r, len, dst->clipr, nil, ZP, SoverD);
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}
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Point
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runestringnop(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r, int len, Drawop op)
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{
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	return _string(dst, pt, src, sp, f, nil, r, len, dst->clipr, nil, ZP, op);
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}
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Point
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_string(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, Rune *r, int len, Rectangle clipr, Image *bg, Point bgp, Drawop op)
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{
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	int m, n, wid, max;
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	ushort cbuf[Max], *c, *ec;
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	uchar *b;
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	char *subfontname;
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	char **sptr;
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	Rune **rptr;
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	Font *def;
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	Subfont *sf;
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	if(s == nil){
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		s = "";
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		sptr = nil;
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	}else
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		sptr = &s;
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	if(r == nil){
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		r = (Rune*) L"";
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		rptr = nil;
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	}else
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		rptr = &r;
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	sf = nil;
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	while((*s || *r) && len > 0){
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		max = Max;
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		if(len < max)
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			max = len;
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		n = cachechars(f, sptr, rptr, cbuf, max, &wid, &subfontname);
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		if(n > 0){
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			_setdrawop(dst->display, op);
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			m = 47+2*n;
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			if(bg)
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				m += 4+2*4;
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			b = bufimage(dst->display, m);
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			if(b == 0){
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				fprint(2, "string: %r\n");
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				break;
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			}
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			if(bg)
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				b[0] = 'x';
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			else
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				b[0] = 's';
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			BPLONG(b+1, dst->id);
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			BPLONG(b+5, src->id);
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			BPLONG(b+9, f->cacheimage->id);
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			BPLONG(b+13, pt.x);
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			BPLONG(b+17, pt.y+f->ascent);
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			BPLONG(b+21, clipr.min.x);
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			BPLONG(b+25, clipr.min.y);
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			BPLONG(b+29, clipr.max.x);
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			BPLONG(b+33, clipr.max.y);
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			BPLONG(b+37, sp.x);
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			BPLONG(b+41, sp.y);
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			BPSHORT(b+45, n);
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			b += 47;
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			if(bg){
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				BPLONG(b, bg->id);
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				BPLONG(b+4, bgp.x);
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				BPLONG(b+8, bgp.y);
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				b += 12;
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			}
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			ec = &cbuf[n];
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			for(c=cbuf; c<ec; c++, b+=2)
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				BPSHORT(b, *c);
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			pt.x += wid;
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			bgp.x += wid;
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			agefont(f);
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			len -= n;
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		}
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		if(subfontname){
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			freesubfont(sf);
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			if((sf=_getsubfont(f->display, subfontname)) == 0){
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				def = f->display ? f->display->defaultfont : nil;
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				if(def && f!=def)
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					f = def;
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				else
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					break;
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			}
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			/*
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			 * must not free sf until cachechars has found it in the cache
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			 * and picked up its own reference.
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			 */
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		}
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	}
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	return pt;
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}