59 lines
2.0 KiB
OCaml
59 lines
2.0 KiB
OCaml
open Pdfutil
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(* Return set of unicode characters in this text *)
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let used_characters t =
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let codepoints = Pdftext.codepoints_of_utf8 t in
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setify codepoints
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let rec of_utf8_with_newlines fontpack t =
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let items = ref [] in
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let buf = ref [] in
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let codepoints = Pdftext.codepoints_of_utf8 t in
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let charcodes_of_codepoints cs =
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option_map
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(fun u ->
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match Cpdfembed.get_char fontpack u with
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| Some (c, _, _) -> Some (char_of_int c)
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| None -> Printf.printf "No glyph for unicode U+%04X in this font\n" u; None)
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cs
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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 items := Cpdftype.Text (charcodes_of_codepoints c)::!items;
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items := Cpdftype.NewLine::!items;
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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 items := Text (charcodes_of_codepoints c)::!items;
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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 = used_characters (Pdfio.string_of_bytes text) in
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let font, fontpack =
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match font with
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| Cpdfembed.PreMadeFontPack t -> (hd (fst t), t)
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| Cpdfembed.EmbedInfo {fontfile; fontname; encoding} ->
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let embedded = Cpdfembed.embed_truetype pdf ~fontfile ~fontname ~codepoints ~encoding in
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(hd (fst embedded), embedded)
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| Cpdfembed.ExistingNamedFont _ -> 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 (Pdfio.string_of_bytes text) in
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let margin =
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Pdfunits.convert
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72. (Pdfpaper.unit papersize) (Pdfunits.PdfPoint) (Pdfpaper.width papersize) /. 15.
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in
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let pages =
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Cpdftype.typeset
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margin margin margin margin papersize pdf
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([Cpdftype.Font (font, fontsize); Cpdftype.BeginDocument] @ instrs)
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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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