sys/src/libdraw/stringwidth.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4
   5 int
   6 _stringnwidth(Font *f, char *s, Rune *r, int len)
   7 {
   8         int wid, twid, n, max, l;
   9         char *name;
  10         enum { Max = 64 };
  11         ushort cbuf[Max];
  12         Rune rune, **rptr;
  13         char *subfontname, **sptr;
  14         Font *def;
  15         Subfont *sf;
  16
  17         if(s == nil){
  18                 s = "";
  19                 sptr = nil;
  20         }else
  21                 sptr = &s;
  22         if(r == nil){
  23                 r = L"";
  24                 rptr = nil;
  25         }else
  26                 rptr = &r;
  27         sf = nil;
  28         twid = 0;
  29         while(len>0 && (*s || *r)){
  30                 max = Max;
  31                 if(len < max)
  32                         max = len;
  33                 n = 0;
  34                 while((l = cachechars(f, sptr, rptr, cbuf, max, &wid, &subfontname)) <= 0){
  35                         if(++n > 10){
  36                                 if(*r)
  37                                         rune = *r;
  38                                 else
  39                                         chartorune(&rune, s);
  40                                 if(f->name != nil)
  41                                         name = f->name;
  42                                 else
  43                                         name = "unnamed font";
  44                                 fprint(2, "stringwidth: bad character set for rune 0x%.4ux in %s\n", rune, name);
  45                                 return twid;
  46                         }
  47                         if(subfontname){
  48                                 freesubfont(sf);
  49                                 if((sf=_getsubfont(f->display, subfontname)) == 0){
  50                                         def = f->display->defaultfont;
  51                                         if(def && f!=def)
  52                                                 f = def;
  53                                         else
  54                                                 break;
  55                                 }
  56                         }
  57                 }
  58                 agefont(f);
  59                 twid += wid;
  60                 len -= l;
  61         }
  62         freesubfont(sf);
  63         return twid;
  64 }
  65
  66 int
  67 stringnwidth(Font *f, char *s, int len)
  68 {
  69         return _stringnwidth(f, s, nil, len);
  70 }
  71
  72 int
  73 stringwidth(Font *f, char *s)
  74 {
  75         return _stringnwidth(f, s, nil, 1<<24);
  76 }
  77
  78 Point
  79 stringsize(Font *f, char *s)
  80 {
  81         return Pt(_stringnwidth(f, s, nil, 1<<24), f->height);
  82 }
  83
  84 int
  85 runestringnwidth(Font *f, Rune *r, int len)
  86 {
  87         return _stringnwidth(f, nil, r, len);
  88 }
  89
  90 int
  91 runestringwidth(Font *f, Rune *r)
  92 {
  93         return _stringnwidth(f, nil, r, 1<<24);
  94 }
  95
  96 Point
  97 runestringsize(Font *f, Rune *r)
  98 {
  99         return Pt(_stringnwidth(f, nil, r, 1<<24), f->height);
 100 }