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