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Extend copyfont to use chains

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John Whitington 2024-11-21 16:28:54 +00:00
parent 7428bde280
commit c63c539daa
1 changed files with 34 additions and 45 deletions
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79
cpdffont.ml
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@ -21,40 +21,45 @@ let embed_missing_fonts path_to_ghostscript gs_quiet fi fo =
| 0 -> exit 0
| _ -> Pdfe.log "Font embedding failed.\n"; exit 2
(* Return any font dictionary from a page or xobject given a chain and the page number. *)
let font_from_name pdf fontname pagenumber =
try
let resources = ref (select pagenumber (Pdfpage.pages_of_pagetree pdf)).Pdfpage.resources in
let chain = ref (tl (String.split_on_char '/' fontname)) in
let font = ref Pdf.Null in
while !chain <> [] do
match !chain with
| [f] ->
font := unopt (Pdf.lookup_chain pdf !resources ["/Font"; ("/" ^ f)]);
chain := []
| x::xs ->
resources := unopt (Pdf.lookup_chain pdf !resources ["/XObject"; "/" ^ x; "/Resources"]);
chain := xs
| [] -> ()
done;
!font
with
_ -> Pdfe.log (Printf.sprintf "Not found: font %s on page %i\n" fontname pagenumber); Pdf.Null
(* Copy a font from [frompdf] with name [fontname] on page [fontpage] to [pdf] on all pages in [range] *)
let copy_font frompdf fontname fontpage range pdf =
match Pdf.renumber_pdfs [frompdf; pdf] with
| [] | [_] | _::_::_::_ -> assert false
| [frompdf; pdf] ->
(* 1. Get fontpage *)
let frompdf_pages = Pdfpage.pages_of_pagetree frompdf in
let frompdf_page =
try select fontpage frompdf_pages with
Not_found -> failwith "copy_font: Page not found in input pdf"
in
(* 2. Extract font *)
let fonts =
match Pdf.lookup_direct frompdf "/Font" frompdf_page.Pdfpage.resources with
| Some f -> f
| None -> failwith "copy_font: font not found"
(* Get font and name *)
let fromfont = font_from_name frompdf fontname fontpage in
let basefontname =
match Pdf.lookup_direct frompdf "/BaseFont" fromfont with
| Some (Pdf.Name n) -> n
| _ -> "/CopyFontAddedNoName"
in
let fromfont =
match Pdf.lookup_direct frompdf fontname fonts with
| Some f -> f
| None -> failwith "copy_font: font not found"
in
let basefontname =
match Pdf.lookup_direct frompdf "/BaseFont" fromfont with
| Some (Pdf.Name n) -> n
| _ -> "/CopyFontAddedNoName"
in
(* 3. Get all objects forming font (except main /Font one) *)
(* Get all objects forming font (except main /Font one) *)
let objnumbers = Pdf.objects_referenced [] [] frompdf fromfont in
(* 4. Copy them to from frompdf to pdf. *)
(* Copy them to from frompdf to pdf. *)
iter (function objnum -> Pdf.addobj_given_num pdf (objnum, Pdf.lookup_obj frompdf objnum)) objnumbers;
(* 5. Get pages from pdf *)
(* Get pages from pdf *)
let pdf_pages = Pdfpage.pages_of_pagetree pdf in
(* 6. Add the font to pages in range *)
(* Add the font to pages in range *)
let pages' =
map
(function (page, pagenum) ->
@ -78,7 +83,7 @@ let copy_font frompdf fontname fontpage range pdf =
else page)
(combine pdf_pages (indx pdf_pages));
in
(* 7. Put the pages back into the pdf, and return *)
(* Put the pages back into the pdf, and return *)
let pdf, root = Pdfpage.add_pagetree pages' pdf in
Pdfpage.add_root root [] pdf
@ -119,6 +124,9 @@ let missing_font ?l pdf page (name, dict) =
| None -> Printf.printf "%i, %s, %s, %s, %s\n" page name subtype basefont encoding
| Some r -> r := (page, name, subtype, basefont, encoding)::!r
(* FIXME We must look at fonts in Form xobjects too. And process them only
once. Plus, process fonts from pages only once too. So, introduce object
numbers as the key (fonts can be direct too though! *)
let missing_fonts ?l pdf range =
Cpdfpage.iter_pages
(fun num page ->
@ -144,25 +152,6 @@ let missing_fonts_return pdf range =
missing_fonts ~l pdf range;
!l
let font_from_name pdf fontname pagenumber =
try
let resources = ref (select pagenumber (Pdfpage.pages_of_pagetree pdf)).Pdfpage.resources in
let chain = ref (tl (String.split_on_char '/' fontname)) in
let font = ref Pdf.Null in
while !chain <> [] do
match !chain with
| [f] ->
font := unopt (Pdf.lookup_chain pdf !resources ["/Font"; ("/" ^ f)]);
chain := []
| x::xs ->
resources := unopt (Pdf.lookup_chain pdf !resources ["/XObject"; "/" ^ x; "/Resources"]);
chain := xs
| [] -> ()
done;
!font
with
_ -> Pdfe.log (Printf.sprintf "Not found: font %s on page %i\n" fontname pagenumber); Pdf.Null
let print_font_table pdf fontname pagenumber =
let fontdict = font_from_name pdf fontname pagenumber in
(* For each item in the fontdict, follow its value and find the basename. If it matches, return that font *)