ref: caef73363f896a1405ce6b9b6435f91e47a9b188
dir: /appl/cmd/ttffs.b/
implement Ttffs;
# serve (over styx) ttf's as inferno/plan 9 (sub)fonts in arbitrary sizes.
# fonts and subfonts are not listed in the directory, but can be walked to.
# the font and subfont files are generated on the fly.
# subfonts contain at most 128 glyphs.
# at first read of a font, it is parsed and its glyph ranges determined.
#
# for each font file (fontpath/*.ttf) the following files are served:
# <name>.<style>.<size>.font
# <name>.<style>.<size>.<index>
#
# the second form are subfonts, index starts at 1. index 1 always has the single char 0.
include "sys.m";
sys: Sys;
sprint: import sys;
include "draw.m";
draw: Draw;
Display, Rect, Point, Image: import draw;
include "arg.m";
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
include "string.m";
str: String;
include "styx.m";
styx: Styx;
Tmsg, Rmsg: import styx;
include "styxservers.m";
styxservers: Styxservers;
Styxserver, Fid, Navigator, Navop: import styxservers;
nametree: Nametree;
Tree: import nametree;
Enotfound: import styxservers;
include "freetype.m";
ft: Freetype;
Face, Glyph: import ft;
include "readdir.m";
readdir: Readdir;
include "tables.m";
tables: Tables;
Table, Strhash: import tables;
Ttffs: module {
init: fn(nil: ref Draw->Context, args: list of string);
};
dflag: int;
fontpath := "/fonts/ttf";
mtpt: con "/mnt/ft";
disp: ref Display;
srv: ref Styxserver;
styles := array[] of {"r", "i", "b", "ib"};
Qroot, Qindex: con iota;
idgen := 2;
Font: adt {
sane,
family: string;
ranges: array of ref (int, int); # sorted, start-end inclusive
styles: cyclic array of ref Style; # indexed by Face.style
};
Style: adt {
f: ref Font;
dir: ref Sys->Dir;
path: string;
fc: ref Face;
sizes: cyclic ref Table[cyclic ref Size]; # size
};
Size: adt {
id: int; # qid.path. subfonts are id+Size.range
st: cyclic ref Style;
range: int; # index for Font.ranges. 0 is .font, 1 is first in range
size: int;
dat: array of byte;
nuse: int;
};
fonts: ref Strhash[ref Font]; # family
sanefonts: ref Strhash[ref Font]; # sane name
sizes: ref Table[ref Size]; # qid.path
init(ctxt: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
if(ctxt == nil || (disp = ctxt.display) == nil)
fail("no display");
draw = load Draw Draw->PATH;
arg := load Arg Arg->PATH;
bufio = load Bufio Bufio->PATH;
str = load String String->PATH;
ft = load Freetype Freetype->PATH;
styx = load Styx Styx->PATH;
styx->init();
styxservers = load Styxservers Styxservers->PATH;
styxservers->init(styx);
nametree = load Nametree Nametree->PATH;
nametree->init();
readdir = load Readdir Readdir->PATH;
tables = load Tables Tables->PATH;
sys->pctl(Sys->NEWPGRP, nil);
Mflag := 0;
arg->init(args);
arg->setusage(arg->progname()+" [-dM] [-p fontpath]");
while((c := arg->opt()) != 0)
case c {
'd' => dflag++;
'p' => fontpath = arg->arg();
'M' => Mflag++;
* => arg->usage();
}
args = arg->argv();
if(args != nil)
arg->usage();
fonts = fonts.new(11, nil);
sanefonts = sanefonts.new(11, nil);
sizes = sizes.new(11, nil);
fds := array[2] of ref Sys->FD;
fd := sys->fildes(0);
if(!Mflag) {
if(sys->pipe(fds) < 0)
fail(sprint("pipe: %r"));
fd = fds[0];
}
navc := chan of ref Navop;
spawn navigator(navc);
msgc: chan of ref Tmsg;
(msgc, srv) = Styxserver.new(fd, Navigator.new(navc), big Qroot);
if(Mflag)
return main(msgc);
spawn main(msgc);
if(sys->mount(fds[1], nil, mtpt, sys->MAFTER, nil) < 0)
fail(sprint("mount: %r"));
return;
}
xwarn(s: string): array of ref (int, int)
{
warn(s);
return nil;
}
# read cached glyph ranges available in the font
readranges(path: string, mtime: int): array of ref (int, int)
{
fd := sys->open(path, Sys->OREAD);
if(fd == nil)
return xwarn(sprint("open %q: %r", path));
(ok, d) := sys->fstat(fd);
if(ok != 0)
return xwarn(sprint("fstat %q: %r", path));
if(d.mtime <= mtime)
return xwarn(sprint("%q: older than ttf, ignoring", path));
if(sys->readn(fd, buf := array[int d.length] of byte, len buf) != len buf)
return xwarn(sprint("readn %q: %r", path));
s := string buf;
r: list of ref (int, int);
for(l := sys->tokenize(s, "\n").t1; l != nil; l = tl l) {
x := sys->tokenize(hd l, " ").t1;
if(len x != 2)
return xwarn(sprint("%q: bad glyph range line: %q", path, hd l));
(a, rem0) := str->toint(hd x, 10);
(b, rem1) := str->toint(hd tl x, 10);
if(rem0 != nil || rem1 != nil || b < a || b > 64*1024 || r != nil && a <= (hd r).t1)
return xwarn(sprint("%q: invalid glyph range: %q", path, hd l));
r = ref (a, b)::r;
}
return l2a(rev(r));
}
genranges(f: ref Face): array of ref (int, int)
{
r := list of {ref (0, 0)};
max := 64*1024;
i := 1;
while(i < max) {
for(; i < max && !f.haschar(i); i++)
{}
s := i;
for(; i < max && f.haschar(i); i++)
{}
e := i;
while(s < e) {
n := e-s;
if(n > 128)
n = 128;
if(dflag > 1) say(sprint("range %d-%d", s, s+n-1));
r = ref (s, s+n-1)::r;
s += n;
}
}
return l2a(rev(r));
}
indexdat: array of byte;
indexmtime: int;
mkindex(): array of byte
{
say("mkindex0");
(ok, dir) := sys->stat(fontpath);
if(ok != 0) {
warn(sprint("stat %q: %r", fontpath));
return nil;
}
if(indexdat != nil && indexmtime == dir.mtime)
return indexdat;
say("mkindex1");
nfonts := fonts.new(11, nil);
nsanefonts := sanefonts.new(11, nil);
nsizes := sizes.new(11, nil);
(a, n) := readdir->init(fontpath, Readdir->NONE);
if(n < 0)
return nil;
for(i := 0; i < len a; i++) {
if(!suffix(".ttf", a[i].name) && !suffix(".otf", a[i].name))
continue;
name := a[i].name;
name = name[:len name-len ".ttf"];
path := sprint("%s/%s", fontpath, a[i].name);
fc := ft->newface(path, 0);
if(fc == nil) {
warn(sprint("newface %q: %r", path));
continue;
}
if(dflag) say(sprint("have face, nfaces=%d index=%d style=%d height=%d ascent=%d familyname=%q stylename=%q",
fc.nfaces, fc.index, fc.style, fc.height, fc.ascent, fc.familyname, fc.stylename));
rpath := sprint("%s/ranges.%s", fontpath, name);
ranges := readranges(rpath, a[i].mtime);
if(ranges == nil) {
ranges = genranges(fc);
s := "";
for(j := 0; j < len ranges; j++)
s += sprint("%d %d\n", ranges[j].t0, ranges[j].t1);
fd := sys->create(rpath, Sys->OWRITE, 8r666);
if(fd == nil || sys->write(fd, buf := array of byte s, len buf) != len buf)
warn(sprint("create or write %q: %r", rpath));
}
f := nfonts.find(fc.familyname);
if(f == nil) {
sane := sanitize(fc.familyname);
while(nsanefonts.find(sane) != nil)
sane += "0";
f = ref Font(sane, fc.familyname, ranges, array[len styles] of ref Style);
nfonts.add(f.family, f);
nsanefonts.add(f.sane, f);
} else if(f.styles[fc.style] != nil) {
warn(sprint("duplicate style %#q", styles[fc.style]));
continue;
}
st := ref Style(f, ref dir, path, fc, nil);
st.sizes = st.sizes.new(11, nil);
f.styles[st.fc.style] = st;
for(l := tabitems(st.sizes); l != nil; l = tl l) {
(nil, size) := *hd l;
nsizes.add(size.id, size);
}
}
s := "";
for(l := strtabitems(nfonts); l != nil; l = tl l) {
f := (hd l).t1;
st := "";
for(i = 0; i < len styles; i++)
if(f.styles[i] != nil)
st += ","+styles[i];
s += sprint("%q %q\n", f.sane, sprint(".%s.%s.2-", f.family, st[1:]));
}
# ensure we don't mkindex immediately after writing ranges files
(ok, dir) = sys->stat(fontpath);
if(ok != 0) {
warn(sprint("stat: %q: %r", fontpath));
return nil;
}
fonts = nfonts;
sanefonts = nsanefonts;
sizes = nsizes;
indexdat = array of byte s;
indexmtime = dir.mtime;
return indexdat;
}
sanitize(s: string): string
{
s = str->tolower(s);
r: string;
for(i := 0; i < len s; i++)
case c := s[i] {
' ' or '\t' or '-' =>
if(r != nil && r[len r-1] != '-')
r[len r] = '-';
'.' => {}
* => r[len r] = c;
}
return r;
}
mkname(s: ref Size): string
{
st := s.st;
fc := st.fc;
f := st.f;
if(s.range == 0)
return sprint("%s.%s.%d.font", f.sane, styles[fc.style], s.size);
return sprint("%s.%s.%d.%d", f.sane, styles[fc.style], s.size, s.range);
}
mkdat(f: ref Size): array of byte
{
if(f.dat == nil) {
if(f.range == 0)
f.dat = mkfont(f);
else
f.dat = mksubfont(f);
}
return f.dat;
}
mkfont(sz: ref Size): array of byte
{
f := sz.st.f;
fc := sz.st.fc;
fc.setcharsize(sz.size<<6, 0, 0);
s := sprint("%d %d\n", fc.height, fc.ascent);
for(i := 0; i < len f.ranges; i++) {
(a, b) := *f.ranges[i];
s += sprint("0x%04x\t0x%04x\t%q\n", a, b, sprint("%s.%s.%d.%d", f.sane, styles[fc.style], sz.size, i+1));
}
return array of byte s;
}
mksubfont(sz: ref Size): array of byte
{
(s, l) := *sz.st.f.ranges[sz.range-1];
fc := sz.st.fc;
fc.setcharsize(sz.size<<6, 0, 0);
imgs := array[l+1-s] of ref Image;
n := l+1-s;
width := 0;
left := array[len imgs+1] of {* => 0};
advance := array[len imgs+1] of {* => 0};
for(i := 0; i < n; i++) {
c := s+i;
g := fc.loadglyph(c);
if(g == nil)
fail(sprint("no glyph for %c (%#x)", c, c));
if(dflag) say(sprint("glyph %#x, width=%d height=%d top=%d left=%d advance=%d,%d", c, g.width, g.height, g.top, g.left, g.advance.x>>6, g.advance.y>>6));
r := Rect((0,0), (g.width, fc.height));
img := imgs[i] = disp.newimage(r, Draw->GREY8, 0, Draw->Black);
gr: Rect;
gr.min = (0,fc.ascent-g.top);
gr.max = gr.min.add((g.width, g.height));
img.writepixels(gr, g.bitmap);
width += g.width;
left[i] = g.left;
advance[i] = g.advance.x>>6;
}
oimghdr := 0;
obuf := oimghdr + 5*12;
osubfhdr := obuf + fc.height*width;
ochars := osubfhdr + 3*12;
oend := ochars + (len imgs+1)*6;
buf := array[oend] of byte;
fontr := Rect((0,0), (width,fc.height));
fontimg := disp.newimage(fontr, Draw->GREY8, 0, Draw->Black);
buf[oimghdr:] = sys->aprint("%11s %11d %11d %11d %11d ", "k8", 0, 0, fontr.max.x, fontr.max.y);
x := 0;
buf[osubfhdr:] = sys->aprint("%11d %11d %11d ", len imgs, fc.height, fc.ascent);
o := ochars;
for(i = 0; i < len imgs+1; i++) {
if(i < len imgs)
img := imgs[i];
buf[o++] = byte (x>>0);
buf[o++] = byte (x>>8);
buf[o++] = byte 0; # top
buf[o++] = byte fc.height; # bottom
buf[o++] = byte left[i]; # left
if(img == nil) {
buf[o++] = byte 0; # width
break;
}
buf[o++] = byte advance[i]; # width
r := fontr;
r.min.x = x;
fontimg.draw(r, disp.white, img, Point(0,0));
x += img.r.dx();
}
if(o != len buf)
raise "bad pack";
r := fontimg.readpixels(fontimg.r, buf[obuf:]);
if(r != osubfhdr-obuf)
fail(sprint("readpixels, got %d, expected %d: %r", r, osubfhdr-obuf));
return buf;
}
main(msgc: chan of ref Tmsg)
{
sys->pctl(Sys->FORKNS, nil);
more:
for(;;) {
mm := <-msgc;
if(mm == nil)
break more;
pick m := mm {
Readerror =>
warn("read: "+m.error);
break more;
* =>
handle(mm);
pick x := mm {
Clunk or
Remove =>
cacheclean();
}
}
}
killgrp(pid());
}
cacheclean()
{
for(k := tabitems(sizes); k != nil; k = tl k)
(hd k).t1.nuse = 0;
for(l := srv.allfids(); l != nil; l = tl l) {
fid := hd l;
f := sizes.find(int fid.path);
if(fid.isopen)
f.nuse++;
}
for(k = tabitems(sizes); k != nil; k = tl k) {
sz := (hd k).t1;
if(sz.nuse == 0 && sz.dat != nil) {
if(dflag) say(sprint("freeing %s.%s.%d.%d", sz.st.f.sane, styles[sz.st.fc.style], sz.size, sz.range));
sz.dat = nil;
}
}
}
navigator(navc: chan of ref Navop)
{
for(;;)
navigate(<-navc);
}
navreply(op: ref Navop, d: ref Sys->Dir, err: string)
{
op.reply <-= (d, err);
}
navigate(op: ref Navop)
{
pick x := op {
Stat =>
case int x.path {
Qroot =>
navreply(x, ref dirroot(), nil);
Qindex =>
navreply(x, ref dirindex(), nil);
* =>
mkindex(); # ensure up to date index
f := sizes.find(int x.path);
if(f == nil)
return navreply(x, nil, sprint("missing Size for qid.path %bd/%#bx", x.path, x.path));
d := ref dir(mkname(f), int x.path, 8r444, len mkdat(f), 0);
navreply(x, d, nil);
}
Walk =>
if(x.name == "..")
return navreply(x, ref dirroot(), nil);
if(x.path != big Qroot)
return navreply(x, nil, Enotfound);
if(x.name == "index")
return navreply(x, ref dirindex(), nil);
mkindex(); # ensure up to date index
name, style, size, suf: string;
s := x.name;
(s, suf) = str->splitstrr(s, ".");
if(s != nil)
(s, size) = str->splitstrr(s[:len s-1], ".");
if(s != nil)
(name, style) = str->splitstrr(s[:len s-1], ".");
if(name == nil)
return navreply(x, nil, Enotfound);
name = name[:len name-1];
if(dflag) say(sprint("walk, name %q, style %q, size %q, suf %q", name, style, size, suf));
# format is good
f := sanefonts.find(name);
if(f == nil)
return navreply(x, nil, "no such font");
sti := find(styles, style);
if(sti < 0 || f.styles[sti] == nil)
return navreply(x, nil, "no such style");
(szs, rem) := str->toint(size, 10);
if(rem != nil)
return navreply(x, nil, Enotfound);
if(szs <= 1)
return navreply(x, nil, "no such size");
r := 0;
if(suf != "font") {
(r, rem) = str->toint(suf, 10);
if(rem != nil || r <= 0 || r > len f.ranges)
return navreply(x, nil, "no such range");
}
st := f.styles[sti];
xsz := st.sizes.find(szs);
if(xsz == nil) {
xsz = ref Size(idgen++, st, 0, szs, nil, 0);
sizes.add(xsz.id, xsz);
for(i := 0; i < len f.ranges; i++) {
ssz := ref Size(idgen++, st, 1+i, szs, nil, 0);
sizes.add(ssz.id, ssz);
}
st.sizes.add(xsz.size, xsz);
}
sz := sizes.find(xsz.id+r);
navreply(x, ref dir(x.name, sz.id, 8r444, len mkdat(sz), 0), nil);
Readdir =>
dirs := array[] of {ref dirindex()};
s := x.offset;
if(s > len dirs)
s = len dirs;
e := x.offset+x.count;
if(e > len dirs)
e = len dirs;
while(s < e)
navreply(x, dirs[s++], nil);
navreply(x, nil, nil);
}
}
handle(mm: ref Tmsg)
{
pick m := mm {
Read =>
ff := srv.getfid(m.fid);
if(ff == nil || ff.path == big Qroot || !ff.isopen)
break;
if(ff.path == big Qindex)
dat := mkindex();
else {
f := sizes.find(int ff.path);
if(f == nil) {
srv.reply(ref Rmsg.Error(m.tag, "size not found?"));
return;
}
dat = mkdat(f);
}
srv.reply(styxservers->readbytes(m, dat));
return;
}
srv.default(mm);
}
dirroot(): Sys->Dir
{
return dir(".", Qroot, 8r555|Sys->DMDIR, 0, 0);
}
dirindex(): Sys->Dir
{
mtime := 0;
(ok, d) := sys->stat(fontpath);
if(ok == 0)
mtime = d.mtime;
return dir("index", Qindex, 8r444, 0, mtime);
}
dir(name: string, path, mode, length, mtime: int): Sys->Dir
{
d := sys->zerodir;
d.name = name;
d.uid = d.gid = "ttffs";
d.qid.path = big path;
d.qid.qtype = Sys->QTFILE;
if(mode&Sys->DMDIR)
d.qid.qtype = Sys->QTDIR;
d.mtime = d.atime = mtime;
d.mode = mode;
d.length = big length;
return d;
}
strtabitems[T](t: ref Strhash[T]): list of ref (string, T)
{
r: list of ref (string, T);
for(i := 0; i < len t.items; i++)
for(l := t.items[i]; l != nil; l = tl l)
r = ref hd l::r;
return r;
}
tabitems[T](t: ref Table[T]): list of ref (int, T)
{
r: list of ref (int, T);
for(i := 0; i < len t.items; i++)
for(l := t.items[i]; l != nil; l = tl l)
r = ref hd l::r;
return r;
}
find(a: array of string, s: string): int
{
for(i := 0; i < len a; i++)
if(a[i] == s)
return i;
return -1;
}
suffix(suf, s: string): int
{
return len s >= len suf && suf == s[len s-len suf:];
}
pid(): int
{
return sys->pctl(0, nil);
}
killgrp(pid: int)
{
sys->fprint(sys->open(sprint("/prog/%d/ctl", pid), Sys->OWRITE), "killgrp");
}
rev[T](l: list of T): list of T
{
r: list of T;
for(; l != nil; l = tl l)
r = hd l::r;
return r;
}
l2a[T](l: list of T): array of T
{
a := array[len l] of T;
i := 0;
for(; l != nil; l = tl l)
a[i++] = hd l;
return a;
}
fd2: ref Sys->FD;
warn(s: string)
{
if(fd2 == nil)
fd2 = sys->fildes(2);
sys->fprint(fd2, "%s\n", s);
}
say(s: string)
{
if(dflag)
warn(s);
}
fail(s: string)
{
warn(s);
killgrp(pid());
raise "fail:"+s;
}