On Thu, 6 Jul 2023 at 08:04, Max Chernoff <mse...@telus.net> wrote:
> Hi Luigi,
>
> I've attached a series of font-related patches.
>
> Patch 1:
>
> Even if you set "tounicode = 1" at the top level of a font, "tounicode =
> <something>" for each character, and run "pdf.setgentounicode(1)",
> LuaTeX will only write out a /ToUnicode entry if the document uses
> "\pdfextension glyphtounicode" somewhere.
>
> A minimal(-ish) example:
>
> % \pdfextension glyphtounicode{fake!}{0000}
>
> \newcount\fontid
> \directlua{
> local height = tex.sp("8bp")
> local width = tex.sp("36bp")
>
> pdf.setgentounicode(1)
>
> local inner = font.define {
> name = "fake-font-inner",
> parameters = {},
> properties = {},
> encodingbytes = 0,
> psname = "none",
> tounicode = 1,
> characters = {
> [1] = {
> width = width,
> height = height,
> depth = 0,
> tounicode = { 0x1f986 },
> }
> }
> }
>
> tex.count.fontid = font.define {
> name = "fake-font-virtual",
> parameters = {},
> properties = {},
> characters = {
> [string.byte"x"] = {
> width = width,
> height = height,
> depth = 0,
> commands = {
> { "slot", 1, 1 }
> }
>
> }
> },
> type = "virtual",
> fonts = {{ id = inner }},
> }
>
> callback.register(
> "provide_charproc_data",
> function (mode, font_id, slot)
> if mode == 2 then
> return pdf.immediateobj("stream", "36 0 d0 0 0 36 8 re
> f"), 36
> elseif mode == 3 then
> return 1 / 10
> end
> end
> )
> }
>
> x{\setfontid\fontid x}x
>
> \bye
>
> You would expect that copying the black box would give you a duck, but
> this only happens if the first line is uncommented. The first patch
> should fix this.
>
>
(sorry for the long delay)
Iiuc, the problem is that in this case glyph_unicode_tree is NULL
( \pdfextension glyphtounicode{fake!}{0000} create a new glyph_unicode_tree
if is the case, by mean of def_tounicode).
So perhaps it's better if we export a new function glyph_unicode_new(void)
at the lua level that allocate ,if the case, a new glyph_unicode_tree,
leaving do_write_tounicode as is now.
--
luigi
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