Hi Max,
On Sat, 2025-09-13 at 10:36 +0000, Werner LEMBERG wrote:
AFAIK, the code in luatex to handle OpenType features (in 'node' mode)
was derived from FontForge.
Luigi and Hans will correct me if I'm wrong here, but I don't believe
that this is the case.
The LuaTeX engine contains a built-in "fontloader" module, which is
indeed based off of FontForge. In the past, the ConTeXt/luaotfload font
code used this module, but at some point, this was rewritten in pure
Lua, so the current ConTeXt/luaotfload font code does not use the
"fontloader" module at all. The "fontloader" module couldn't be removed
due to backwards compatibility concerns, but as far as I'm aware, nobody
uses the "fontloader" module for anything right now.
You can never predict what is not used ... it's also why luatex is now
not extended / improved any more ... expectations.
But indeed you're right (as usual). At some point I wanted to get around
heuristics that libraries like ff have and are hard to bypass. I also
wanted to read some tables that ff didn't read. So I just went for a lua
based reader. That also made it easier to move on to luametatex where
indeed that ff library is not present at all (in fact, no loading code
is present, we also read tfm etc in lua). It also performs better.
Wrt to this somewhat weird thread about marks and fixing a cached font
then to be recached (likely less efficient) while it can be done runtime
(at no cost and efficiently) ... assuming that slot 50 has something is
a bad idea ... in my case (context) it's in slot 53 and even then one
has to descend one level more to reach the hit
53 1 1 65 335 -30
53 1 2 65 363 675
53 1 3 65 0 0
53 1 4 65 0 0
with
local t = fonts.hashes.identifiers[true]
local i = 1
while true do
local s = t.resources.sequences[i]
if not s then
break
elseif s.type == "gpos_mark2base" then
local si = s.steps
if si then
for j=1,#si do
local b = si[j].baseclasses
if b then
for k=1,#b do
local a = b[k][65]
if a then
print(i,j,k,65,a[1],a[2])
end
end
end
end
end
end
i = i + 1
end
the only reason i checked it that there was this "discoverd a bug"
mentioning so i checked the code and so it looked like i wasted over an
hour
thanks for dealing with this
Hans
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Hans Hagen | PRAGMA ADE
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