Initial import.
diff --git a/src/libdraw/stringsubfont.c b/src/libdraw/stringsubfont.c
new file mode 100644
index 0000000..cc83473
--- /dev/null
+++ b/src/libdraw/stringsubfont.c
@@ -0,0 +1,65 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+
+Point
+stringsubfont(Image *b, Point p, Image *color, Subfont *f, char *cs)
+{
+ int w, width;
+ uchar *s;
+ Rune c;
+ Fontchar *i;
+
+ s = (uchar*)cs;
+ for(; c=*s; p.x+=width){
+ width = 0;
+ if(c < Runeself)
+ s++;
+ else{
+ w = chartorune(&c, (char*)s);
+ if(w == 0){
+ s++;
+ continue;
+ }
+ s += w;
+ }
+ if(c >= f->n)
+ continue;
+ i = f->info+c;
+ width = i->width;
+ draw(b, Rect(p.x+i->left, p.y+i->top, p.x+i->left+(i[1].x-i[0].x), p.y+i->bottom),
+ color, f->bits, Pt(i->x, i->top));
+ }
+ return p;
+}
+
+Point
+strsubfontwidth(Subfont *f, char *cs)
+{
+ Rune c;
+ Point p;
+ uchar *s;
+ Fontchar *i;
+ int w, width;
+
+ p = Pt(0, f->height);
+ s = (uchar*)cs;
+ for(; c=*s; p.x+=width){
+ width = 0;
+ if(c < Runeself)
+ s++;
+ else{
+ w = chartorune(&c, (char*)s);
+ if(w == 0){
+ s++;
+ continue;
+ }
+ s += w;
+ }
+ if(c >= f->n)
+ continue;
+ i = f->info+c;
+ width = i->width;
+ }
+ return p;
+}
