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cpdf-source
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This commit is contained in:
John Whitington 2022-09-12 16:06:56 +01:00
parent d8fe8c7b07
commit 79dd9607c9
1 changed files with 30 additions and 13 deletions
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43
cpdfembed.ml
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@ -1,4 +1,4 @@
(* Truetype font embedding example *)
(* Embed a font *)
open Pdfutil
(* For the first stage of our embedder, we are only allowing Latin, and we don't actually subset.
@ -30,7 +30,12 @@ let pdfcode_of_unicode_codepoint encoding_table glyphlist_table u =
let calc_accepted_unicodepoints encoding_table glyphlist_table codepoints =
setify
(option_map
(fun u -> match pdfcode_of_unicode_codepoint encoding_table glyphlist_table u with Some _ -> Some u | None -> None)
(fun u ->
match
pdfcode_of_unicode_codepoint encoding_table glyphlist_table u
with
| Some _ -> Some u
| None -> None)
codepoints)
let fontnum = ref 0
@ -51,35 +56,47 @@ let embed_truetype pdf ~fontfile ~fontname ~text ~encoding =
let encoding_table = Pdftext.reverse_table_of_encoding encoding in
let accepted_unicodepoints =
map
(fun u -> (u, pdfcode_of_unicode_codepoint encoding_table glyphlist_table u))
(calc_accepted_unicodepoints encoding_table glyphlist_table unicodepoints)
in
let f =
Cpdftruetype.parse ~subset:accepted_unicodepoints fontfile
(fun u ->
(u, pdfcode_of_unicode_codepoint encoding_table glyphlist_table u))
(calc_accepted_unicodepoints
encoding_table glyphlist_table unicodepoints)
in
let f = Cpdftruetype.parse ~subset:accepted_unicodepoints fontfile in
let widths =
Pdf.Array (map (fun x -> Pdf.Integer x) (Array.to_list f.Cpdftruetype.widths))
Pdf.Array
(map (fun x -> Pdf.Integer x)
(Array.to_list f.Cpdftruetype.widths))
in
let name_1 = basename () in
let fontfile =
let len = Pdfio.bytes_size fontfile in
Pdf.Stream
{contents =
(Pdf.Dictionary [("/Length", Pdf.Integer len); ("/Length1", Pdf.Integer len)],
(Pdf.Dictionary
[("/Length", Pdf.Integer len); ("/Length1", Pdf.Integer len)],
Pdf.Got fontfile)}
in
let fontfile_num = Pdf.addobj pdf fontfile in
let module TT = Cpdftruetype in
let fontdescriptor =
Pdfread.parse_single_object
(Printf.sprintf "<</Type/FontDescriptor/FontName/%s+%s/Flags %i/FontBBox[%i %i %i %i]/ItalicAngle %i/Ascent %i/Descent %i/CapHeight %i/StemV %i/XHeight %i/AvgWidth %i/MaxWidth %i/FontFile2 %i 0 R>>"
name_1 fontname f.Cpdftruetype.flags f.Cpdftruetype.minx f.Cpdftruetype.miny f.Cpdftruetype.maxx f.Cpdftruetype.maxy f.Cpdftruetype.italicangle
f.Cpdftruetype.ascent f.Cpdftruetype.descent f.Cpdftruetype.capheight f.Cpdftruetype.stemv f.Cpdftruetype.xheight f.Cpdftruetype.avgwidth f.Cpdftruetype.maxwidth fontfile_num)
(Printf.sprintf
"<</Type/FontDescriptor/FontName/%s+%s/Flags %i/FontBBox[%i %i %i %i] \
/ItalicAngle %i/Ascent %i/Descent %i/CapHeight %i/StemV %i/XHeight \
%i/AvgWidth %i/MaxWidth %i/FontFile2 %i 0 R>>"
name_1 fontname f.TT.flags f.TT.minx f.TT.miny f.TT.maxx f.TT.maxy
f.TT.italicangle f.TT.ascent f.TT.descent f.TT.capheight f.TT.stemv
f.TT.xheight f.TT.avgwidth f.TT.maxwidth fontfile_num)
in
let fontdesc_num = Pdf.addobj pdf fontdescriptor in
let font =
Pdf.add_dict_entry
(Pdfread.parse_single_object
(Printf.sprintf "<</Type/Font/Subtype/TrueType/BaseFont/%s+%s/FontDescriptor %i 0 R/Encoding%s/FirstChar %i/LastChar %i>>" name_1 fontname fontdesc_num (string_of_encoding encoding) f.Cpdftruetype.firstchar f.Cpdftruetype.lastchar))
(Printf.sprintf
"<</Type/Font/Subtype/TrueType/BaseFont/%s+%s/FontDescriptor %i 0 R\
/Encoding%s/FirstChar %i/LastChar %i>>"
name_1 fontname fontdesc_num (string_of_encoding encoding)
f.TT.firstchar f.TT.lastchar))
"/Widths"
widths
in