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Beginning to adapt -draw to allow -font-ttf

This commit is contained in:
John Whitington 2023-07-13 14:04:10 +01:00
parent fcccb4820f
commit acddfb1ac7
1 changed files with 35 additions and 25 deletions
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48
cpdfdraw.ml
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@ -80,7 +80,8 @@ type res =
form_xobjects : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
mutable page_names : string list;
mutable time : Cpdfstrftime.t;
mutable current_fontpack : Cpdfembed.cpdffont;
mutable current_fontpack : Cpdfembed.t;
mutable font_size : float;
mutable num : int}
let empty_res () =
@ -91,9 +92,9 @@ let empty_res () =
page_names = [];
time = Cpdfstrftime.dummy;
current_fontpack =
Cpdfembed.PreMadeFontPack
(Cpdfembed.fontpack_of_standardfont
(Pdftext.StandardFont (Pdftext.TimesRoman, Pdftext.WinAnsiEncoding)));
font_size = 12.;
num = 0}
let resstack =
@ -135,12 +136,16 @@ let process_specials pdf endpage filename bates batespad num page s =
in
Cpdfaddtext.process_text (res ()).time s pairs
let charcodes_of_utf8 s =
(* FIXME: implement for other kinds of font *)
let runs_of_utf8 s =
match (res ()).current_fontpack with
| PreMadeFontPack fontpack ->
| ((f::_, _) as fontpack) ->
let codepoints = Pdftext.codepoints_of_utf8 s in
let charcodes = option_map (Cpdfembed.get_char fontpack) codepoints in
implode (map (fun (c, _, _) -> char_of_int c) charcodes)
let fontname =
fst (Hashtbl.find (res ()).fonts f)
in
[Pdfops.Op_Tf (fontname, (res ()).font_size); Pdfops.Op_Tj (implode (map (fun (c, _, _) -> char_of_int c) charcodes))]
| _ -> failwith "charcodes_of_utf8: unknown font"
let extgstate kind v =
@ -229,28 +234,33 @@ let rec ops_of_drawop pdf endpage filename bates batespad num page = function
| NewPage -> Pdfe.log ("NewPage remaining in graphic stream"); assert false
| Opacity v -> [Pdfops.Op_gs (extgstate "/ca" v)]
| SOpacity v -> [Pdfops.Op_gs (extgstate "/CA" v)]
| Font (fontpack, size) ->
let font =
match fontpack with
| PreMadeFontPack (f::_, _) -> f
| _ -> failwith "-font-ttf not impl"
| Font (cpdffont, size) ->
let fontpack =
match cpdffont with
| PreMadeFontPack fp -> fp
| EmbedInfo {fontfile; fontname; encoding} ->
Cpdfembed.embed_truetype pdf ~fontfile ~fontname ~codepoints:[int_of_char 'a'] ~encoding
| ExistingNamedFont ->
error "-draw does not support using an exsiting named font"
in
let (n, _) =
try Hashtbl.find (res ()).fonts font with
let ns =
map
(fun font ->
try fst (Hashtbl.find (res ()).fonts font) with
Not_found ->
let o = Pdftext.write_font pdf font in
let n = fresh_name "/F" in
Hashtbl.add (res ()).fonts font (n, o);
(n, o)
n)
(fst fontpack)
in
(res ()).current_fontpack <- fontpack;
(res ()).page_names <- n::(res ()).page_names;
[Pdfops.Op_Tf (n, size)]
(res ()).page_names <- ns @ (res ()).page_names;
(res ()).font_size <- size;
[]
| TextSection ops -> [Pdfops.Op_BT] @ ops_of_drawops pdf endpage filename bates batespad num page ops @ [Pdfops.Op_ET]
| Text s -> [Pdfops.Op_Tj (charcodes_of_utf8 s)]
| SpecialText s ->
let s = process_specials pdf endpage filename bates batespad num page s in
[Pdfops.Op_Tj (charcodes_of_utf8 s)]
| Text s -> runs_of_utf8 s
| SpecialText s -> runs_of_utf8 (process_specials pdf endpage filename bates batespad num page s)
| Leading f -> [Pdfops.Op_TL f]
| CharSpace f -> [Pdfops.Op_Tc f]
| WordSpace f -> [Pdfops.Op_Tw f]