64 lines
2.3 KiB
OCaml
64 lines
2.3 KiB
OCaml
open Pdfutil
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let rec of_utf8_with_newlines fontpack fontsize t =
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let items = ref [] in
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let currfont = ref ~-1 in
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let codepoints = Pdftext.codepoints_of_utf8 t in
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let currtext = ref [] in
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let process_codepoints cs =
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iter
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(fun u ->
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match Cpdfembed.get_char fontpack u with
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| Some (c, n, f) ->
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begin if n <> !currfont then
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begin
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if !currtext <> [] then items := Cpdftype.Text (rev !currtext)::!items;
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currtext := [];
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currfont := n;
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items := Cpdftype.Font (string_of_int n, f, fontsize)::!items;
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currtext := char_of_int c::!currtext;
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end
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else
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currtext := char_of_int c::!currtext
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end
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| None -> Printf.printf "No glyph for unicode U+%04X in this font\n" u)
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cs;
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items := Cpdftype.Text (rev !currtext)::!items
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in
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let buf = ref [] in
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List.iter
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(function
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| 10 (*'\n'*) ->
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let c = rev !buf in
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if c <> [] then process_codepoints c;
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items := Cpdftype.NewLine::!items;
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currtext := [];
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buf := []
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| 13 (*'\r'*) -> ()
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| x ->
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buf := x::!buf)
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codepoints;
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(* Do last one *)
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let c = rev !buf in
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if c <> [] then process_codepoints c;
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rev !items
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let typeset ~papersize ~font ~fontsize text =
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let pdf = Pdf.empty () in
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let codepoints = setify (Pdftext.codepoints_of_utf8 (Pdfio.string_of_bytes text)) in
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let fontpack =
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match font with
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| Cpdfembed.PreMadeFontPack t -> t
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| Cpdfembed.EmbedInfo {fontfile; fontname; encoding} ->
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Cpdfembed.embed_truetype pdf ~fontfile ~fontname ~codepoints ~encoding
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| Cpdfembed.ExistingNamedFont ->
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raise (Pdf.PDFError "Can't use existing named font for text-to-PDF")
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in
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let instrs = of_utf8_with_newlines fontpack fontsize (Pdfio.string_of_bytes text) in
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let margin = Pdfunits.points (Pdfpaper.width papersize) (Pdfpaper.unit papersize) /. 15. in
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let firstfont = hd (keep (function Cpdftype.Font _ -> true | _ -> false) instrs) in
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let instrs = [firstfont; Cpdftype.BeginDocument] @ instrs in
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let pages = Cpdftype.typeset margin margin margin margin papersize pdf instrs in
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let pdf, pageroot = Pdfpage.add_pagetree pages pdf in
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Pdfpage.add_root pageroot [] pdf
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