code: plan9front

ref: 365e63b36a413703f5fcd0ed5ccbd79c3a53afbf
dir: /sys/src/libdraw/string.c/

#include <u.h>
#include <libc.h>
#include <draw.h>

enum
{
	Max = 100
};

Point
string(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s)
{
	return _string(dst, pt, src, sp, f, s, nil, 1<<24, dst->clipr, nil, ZP, SoverD);
}

Point
stringop(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, Drawop op)
{
	return _string(dst, pt, src, sp, f, s, nil, 1<<24, dst->clipr, nil, ZP, op);
}

Point
stringn(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, int len)
{
	return _string(dst, pt, src, sp, f, s, nil, len, dst->clipr, nil, ZP, SoverD);
}

Point
stringnop(Image *dst, Point pt, Image *src, Point sp, Font *f, char *s, int len, Drawop op)
{
	return _string(dst, pt, src, sp, f, s, nil, len, dst->clipr, nil, ZP, op);
}

Point
runestring(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r)
{
	return _string(dst, pt, src, sp, f, nil, r, 1<<24, dst->clipr, nil, ZP, SoverD);
}

Point
runestringop(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r, Drawop op)
{
	return _string(dst, pt, src, sp, f, nil, r, 1<<24, dst->clipr, nil, ZP, op);
}

Point
runestringn(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r, int len)
{
	return _string(dst, pt, src, sp, f, nil, r, len, dst->clipr, nil, ZP, SoverD);
}

Point
runestringnop(Image *dst, Point pt, Image *src, Point sp, Font *f, Rune *r, int len, Drawop op)
{
	return _string(dst, pt, src, sp, f, nil, r, len, dst->clipr, nil, ZP, op);
}

Point
_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)
{
	int m, n, wid, max, try;
	ushort cbuf[Max], *c, *ec;
	uchar *b;
	char *subfontname;
	char **sptr;
	Rune **rptr, rune;
	Subfont *sf;

	if(s == nil){
		s = "";
		sptr = nil;
	}else
		sptr = &s;
	if(r == nil){
		r = (Rune*) L"";
		rptr = nil;
	}else
		rptr = &r;
	subfontname = nil;
	sf = nil;
	try = 0;
	while((*s || *r) && len > 0){
		max = Max;
		if(len < max)
			max = len;
		if(subfontname){
			freesubfont(sf);
			if((sf=_getsubfont(f->display, subfontname)) == nil){
				if(f->display->defaultfont == nil || f->display->defaultfont == f)
					break;
				f = f->display->defaultfont;
			}
		}
		if((n = cachechars(f, sptr, rptr, cbuf, max, &wid, &subfontname)) <= 0){
			if(n == 0){
				if(++try > 10)
					break;
				continue;
			}
			if(*r)
				r++;
			else
				s += chartorune(&rune, s);
			len--;
			continue;
		}
		try = 0;

		_setdrawop(dst->display, op);

		m = 47+2*n;
		if(bg)
			m += 4+2*4;
		b = bufimage(dst->display, m);
		if(b == nil){
			fprint(2, "string: %r\n");
			break;
		}
		if(bg)
			b[0] = 'x';
		else
			b[0] = 's';
		BPLONG(b+1, dst->id);
		BPLONG(b+5, src->id);
		BPLONG(b+9, f->cacheimage->id);
		BPLONG(b+13, pt.x);
		BPLONG(b+17, pt.y+f->ascent);
		BPLONG(b+21, clipr.min.x);
		BPLONG(b+25, clipr.min.y);
		BPLONG(b+29, clipr.max.x);
		BPLONG(b+33, clipr.max.y);
		BPLONG(b+37, sp.x);
		BPLONG(b+41, sp.y);
		BPSHORT(b+45, n);
		b += 47;
		if(bg){
			BPLONG(b, bg->id);
			BPLONG(b+4, bgp.x);
			BPLONG(b+8, bgp.y);
			b += 12;
		}
		ec = &cbuf[n];
		for(c=cbuf; c<ec; c++, b+=2)
			BPSHORT(b, *c);
		pt.x += wid;
		bgp.x += wid;
		agefont(f);
		len -= n;
	}
	freesubfont(sf);
	return pt;
}