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.
>
> Patch 2:
>
> Defining a Type 3 font with a character index greater than 256 can cause
> a segfault. Using an index >256 is impossible with a T3 font, but you
> shouldn't be able to cause a segfault from Lua code.
>
> Minimal example:
>
> \directlua{
> local height = tex.sp("8bp")
> local width = tex.sp("36bp")
>
> local id = font.define {
> name = "fake-font-inner",
> parameters = {},
> properties = {},
> encodingbytes = 0,
> psname = "none",
> tounicode = 1,
> characters = {
> [0x1f986] = {
> width = width,
> height = height,
> depth = 0,
> }
> }
> }
>
> 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
> )
>
> local glyph = node.new("glyph")
> glyph.font = id
> glyph.char = 0x1f986
>
> tex.forcehmode()
> node.write(glyph)
> }
> \bye
>
> The second patch catches this when the font is initialized, skips the
> too-large character, and issues a warning.
>
> Patch 3:
>
> The third patch adds the "provide_charproc_data" callback to the manual.
>
> Thanks,
> -- Max
>
ok, I will check them during this weekend.
--
luigi
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