package draw9 import (	"image"	"log") func (dst *Image) String(pt image.Point, src *Image, sp image.Point, f *Font, s string) image.Point {	if dst == nil {		panic("nil dst")	}	if dst.Display == nil {		panic("nil dst display")	}	dst.Display.mu.Lock()	defer dst.Display.mu.Unlock()	return _string(dst, pt, src, sp, f, s, nil, nil, dst.Clipr, nil, image.ZP, SoverD)} func (dst *Image) StringOp(pt image.Point, src *Image, sp image.Point, f *Font, s string, op Op) image.Point {	dst.Display.mu.Lock()	defer dst.Display.mu.Unlock()	return _string(dst, pt, src, sp, f, s, nil, nil, dst.Clipr, nil, image.ZP, op)} func (dst *Image) Runes(pt image.Point, src *Image, sp image.Point, f *Font, r []rune) image.Point {	dst.Display.mu.Lock()	defer dst.Display.mu.Unlock()	return _string(dst, pt, src, sp, f, "", nil, r, dst.Clipr, nil, image.ZP, SoverD)} func (dst *Image) RunesOp(pt image.Point, src *Image, sp image.Point, f *Font, r []rune, op Op) image.Point {	dst.Display.mu.Lock()	defer dst.Display.mu.Unlock()	return _string(dst, pt, src, sp, f, "", nil, r, dst.Clipr, nil, image.ZP, op)} func (dst *Image) Bytes(pt image.Point, src *Image, sp image.Point, f *Font, b []byte) image.Point {	dst.Display.mu.Lock()	defer dst.Display.mu.Unlock()	return _string(dst, pt, src, sp, f, "", b, nil, dst.Clipr, nil, image.ZP, SoverD)} func (dst *Image) BytesOp(pt image.Point, src *Image, sp image.Point, f *Font, b []byte, op Op) image.Point {	dst.Display.mu.Lock()	defer dst.Display.mu.Unlock()	return _string(dst, pt, src, sp, f, "", b, nil, dst.Clipr, nil, image.ZP, op)} func _string(dst *Image, pt image.Point, src *Image, sp image.Point, f *Font, s string, b []byte, r []rune, clipr image.Rectangle, bg *Image, bgp image.Point, op Op) image.Point {	if dst.Display != nil && dst.Display.debug {		log.Printf("_string %s %q", f, s)	}	var in input	in.init(s, b, r)	const Max = 100	cbuf := make([]uint16, Max)	var sf *Subfont	for !in.done {		max := Max		n, wid, subfontname := cachechars(f, &in, cbuf, max)		if dst.Display != nil && dst.Display.debug {			log.Printf("cachechars %d %d %q", n, wid, subfontname)		}		if n > 0 {			setdrawop(dst.Display, op)			m := 47 + 2*n			if bg != nil {				m += 4 + 2*4			}			b := dst.Display.bufimage(m)			if bg != nil {				b[0] = 'x'			} else {				b[0] = 's'			}			bplong(b[1:], uint32(dst.ID))			bplong(b[5:], uint32(src.ID))			bplong(b[9:], uint32(f.cacheimage.ID))			bplong(b[13:], uint32(pt.X))			bplong(b[17:], uint32(pt.Y+f.Ascent))			bplong(b[21:], uint32(clipr.Min.X))			bplong(b[25:], uint32(clipr.Min.Y))			bplong(b[29:], uint32(clipr.Max.X))			bplong(b[33:], uint32(clipr.Max.Y))			bplong(b[37:], uint32(sp.X))			bplong(b[41:], uint32(sp.Y))			bpshort(b[45:], uint16(n))			b = b[47:]			if bg != nil {				bplong(b, uint32(bg.ID))				bplong(b[4:], uint32(bgp.X))				bplong(b[8:], uint32(bgp.Y))				b = b[12:]			}			for i, c := range cbuf[:n] {				bpshort(b[2*i:], c)			}			pt.X += wid			bgp.X += wid			agefont(f)		}		if subfontname != "" {			sf.free()			var err error			sf, err = getsubfont(f.Display, subfontname)			if err != nil {				if f.Display != nil && f != f.Display.DefaultFont {					f = f.Display.DefaultFont					continue				}				break			}			/*			 * must not free sf until cachechars has found it in the cache			 * and picked up its own reference.			 */		}	}	return pt}