Hi Patrick,
On Wed, 2025-04-09 at 11:45 +0200, Patrick Gundlach wrote:
> Do you know (does anyone know) how to activate this callback?
>
> I do
>
> callback.register("glyph_stream_provider",function () assert(false) end)
>
> but this never gets called.
This is the shortest document that I was able to get to work:
\directlua{
callback.register("glyph_stream_provider",function(font_id, char_index,
mode)
texio.write_nl("")
print("glyph_stream_provider", font_id, char_index, mode)
if mode == 1 or mode == 2 then
return ""
elseif mode == 3 then
return 0, 0, 0, 0
else
error()
end
end)
local characters = {}
for _, code in utf8.codes("Hello, world!") do
characters[code] = { index = code, }
end
local otf = font.define {
name = "texgyreheros-regular.otf",
characters = characters,
streamprovider = 1,
format = "opentype",
filename = "texgyreheros-regular.otf",
}
token.set_char("otf", otf)
local ttf = font.define {
name = "NotoSans-Regular.ttf",
characters = characters,
streamprovider = 3,
format = "truetype",
filename = "NotoSans-Regular.ttf",
}
token.set_char("ttf", ttf)
}
{\setfontid\otf Hello, world! \vfill\eject}
{\setfontid\ttf Hello, world! \vfill\eject}
\bye
On Wed, 2025-04-09 at 12:37 +0200, Patrick Gundlach wrote:
> Sadly, this is (as the name suggests) only the code for each glyph. I
> wish I could pass a complete font program to a callback and subset
> everything by myself (or rather: the harfbuzz subsetting library
You should be able to write out the subsetted font directly to the PDF,
then make a virtual font with commands something like
commands = {
{ "pdf", "direct", "/yourfontname 10 Tf (yourcharacter)" },
}
although that is kinda ugly. But the LaTeX additions to luaotfload
support variable fonts via HarfBuzz, so you should probably look at what
they're doing there.
Thanks,
-- Max
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