ref: a8083462e62459b2ae8a243dc4ba88416eba03b1
dir: /libdraw/stringwidth.c/
#include "lib9.h" #include "draw.h" int _stringnwidth(Font *f, char *s, Rune *r, int len) { int wid, twid, n, max, l; char *name; enum { Max = 64 }; ushort cbuf[Max]; Rune rune, **rptr; char *subfontname, **sptr; Font *def; static Rune rnull; if(s == nil){ s = ""; sptr = nil; }else sptr = &s; if(r == nil){ r = &rnull; rptr = nil; }else rptr = &r; twid = 0; while(len>0 && (*s || *r)){ max = Max; if(len < max) max = len; n = 0; while((l = cachechars(f, sptr, rptr, cbuf, max, &wid, &subfontname)) <= 0){ if(++n > 10){ if(*r) rune = *r; else chartorune(&rune, s); if(f->name != nil) name = f->name; else name = "unnamed font"; _drawprint(2, "stringwidth: bad character set for rune 0x%.4ux in %s\n", rune, name); return twid; } if(subfontname){ if(_getsubfont(f->display, subfontname) == 0){ def = f->display->defaultfont; if(def && f!=def) f = def; else break; } } } agefont(f); twid += wid; len -= l; } return twid; } int stringnwidth(Font *f, char *s, int len) { return _stringnwidth(f, s, nil, len); } int stringwidth(Font *f, char *s) { return _stringnwidth(f, s, nil, 1<<24); } Point stringsize(Font *f, char *s) { return Pt(_stringnwidth(f, s, nil, 1<<24), f->height); } int runestringnwidth(Font *f, Rune *r, int len) { return _stringnwidth(f, nil, r, len); } int runestringwidth(Font *f, Rune *r) { return _stringnwidth(f, nil, r, 1<<24); } Point runestringsize(Font *f, Rune *r) { return Pt(_stringnwidth(f, nil, r, 1<<24), f->height); }