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/* Copyright (c) 1992 AT&T - All rights reserved. */
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <frame.h>
int
_frcanfit(Frame *f, Point pt, Frbox *b)
{
int left, w, nr;
uchar *p;
Rune r;
left = f->r.max.x-pt.x;
if(b->nrune < 0)
return b->a.b.minwid <= left;
if(left >= b->wid)
return b->nrune;
for(nr=0,p=b->a.ptr; *p; p+=w,nr++){
r = *p;
if(r < Runeself)
w = 1;
else
w = chartorune(&r, (char*)p);
left -= charwidth(f->font, r);
if(left < 0)
return nr;
}
berror("_frcanfit can't");
return 0;
}
void
_frcklinewrap(Frame *f, Point *p, Frbox *b)
{
if((b->nrune<0? b->a.b.minwid : b->wid) > f->r.max.x-p->x){
p->x = f->left;
p->y += f->font->height;
}
}
void
_frcklinewrap0(Frame *f, Point *p, Frbox *b)
{
if(_frcanfit(f, *p, b) == 0){
p->x = f->left;
p->y += f->font->height;
}
}
void
_fradvance(Frame *f, Point *p, Frbox *b)
{
if(b->nrune<0 && b->a.b.bc=='\n'){
p->x = f->left;
p->y += f->font->height;
}else
p->x += b->wid;
}
int
_frnewwid(Frame *f, Point pt, Frbox *b)
{
int c, x;
c = f->r.max.x;
x = pt.x;
if(b->nrune >= 0)
return b->wid;
if(b->a.b.bc == '\t'){
if(x+b->a.b.minwid > c)
x = pt.x = f->left;
x += f->maxtab;
x -= (x-f->left)%f->maxtab;
if(x-pt.x<b->a.b.minwid || x>c)
x = pt.x+b->a.b.minwid;
b->wid = x-pt.x;
}
return b->wid;
}
void
_frclean(Frame *f, Point pt, int n0, int n1) /* look for mergeable boxes */
{
Frbox *b;
int nb, c;
c = f->r.max.x;
for(nb=n0; nb<n1-1; nb++){
b = &f->box[nb];
_frcklinewrap(f, &pt, b);
while(b[0].nrune>=0 && nb<n1-1 && b[1].nrune>=0 && pt.x+b[0].wid+b[1].wid<c){
_frmergebox(f, nb);
n1--;
b = &f->box[nb];
}
_fradvance(f, &pt, &f->box[nb]);
}
for(; nb<f->nbox; nb++){
b = &f->box[nb];
_frcklinewrap(f, &pt, b);
_fradvance(f, &pt, &f->box[nb]);
}
f->lastlinefull = 0;
if(pt.y >= f->r.max.y)
f->lastlinefull = 1;
}
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