Initial import.

src/libframe/frptofchar.c

@@ -0,0 +1,115 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <mouse.h>
+#include <frame.h>
+
+Point
+_frptofcharptb(Frame *f, ulong p, Point pt, int bn)
+{
+	uchar *s;
+	Frbox *b;
+	int w, l;
+	Rune r;
+
+	for(b = &f->box[bn]; bn<f->nbox; bn++,b++){
+		_frcklinewrap(f, &pt, b);
+		if(p < (l=NRUNE(b))){
+			if(b->nrune > 0)
+				for(s=b->ptr; p>0; s+=w, p--){
+					if((r = *s) < Runeself)
+						w = 1;
+					else
+						w = chartorune(&r, (char*)s);
+					pt.x += stringnwidth(f->font, (char*)s, 1);
+					if(r==0 || pt.x>f->r.max.x)
+						drawerror(f->display, "frptofchar");
+				}
+			break;
+		}
+		p -= l;
+		_fradvance(f, &pt, b);
+	}
+	return pt;
+}
+
+Point
+frptofchar(Frame *f, ulong p)
+{
+	return _frptofcharptb(f, p, f->r.min, 0);
+}
+
+Point
+_frptofcharnb(Frame *f, ulong p, int nb)	/* doesn't do final _fradvance to next line */
+{
+	Point pt;
+	int nbox;
+
+	nbox = f->nbox;
+	f->nbox = nb;
+	pt = _frptofcharptb(f, p, f->r.min, 0);
+	f->nbox = nbox;
+	return pt;
+}
+
+static
+Point
+_frgrid(Frame *f, Point p)
+{
+	p.y -= f->r.min.y;
+	p.y -= p.y%f->font->height;
+	p.y += f->r.min.y;
+	if(p.x > f->r.max.x)
+		p.x = f->r.max.x;
+	return p;
+}
+
+ulong
+frcharofpt(Frame *f, Point pt)
+{
+	Point qt;
+	int w, bn;
+	uchar *s;
+	Frbox *b;
+	ulong p;
+	Rune r;
+
+	pt = _frgrid(f, pt);
+	qt = f->r.min;
+	for(b=f->box,bn=0,p=0; bn<f->nbox && qt.y<pt.y; bn++,b++){
+		_frcklinewrap(f, &qt, b);
+		if(qt.y >= pt.y)
+			break;
+		_fradvance(f, &qt, b);
+		p += NRUNE(b);
+	}
+	for(; bn<f->nbox && qt.x<=pt.x; bn++,b++){
+		_frcklinewrap(f, &qt, b);
+		if(qt.y > pt.y)
+			break;
+		if(qt.x+b->wid > pt.x){
+			if(b->nrune < 0)
+				_fradvance(f, &qt, b);
+			else{
+				s = b->ptr;
+				for(;;){
+					if((r = *s) < Runeself)
+						w = 1;
+					else
+						w = chartorune(&r, (char*)s);
+					if(r == 0)
+						drawerror(f->display, "end of string in frcharofpt");
+					qt.x += stringnwidth(f->font, (char*)s, 1);
+					s += w;
+					if(qt.x > pt.x)
+						break;
+					p++;
+				}
+			}
+		}else{
+			p += NRUNE(b);
+			_fradvance(f, &qt, b);
+		}
+	}
+	return p;
+}