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