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/QuadPoints

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John Whitington 2021-12-15 08:53:34 +00:00
parent f116c0b840
commit e3480f16d9
2 changed files with 40 additions and 67 deletions
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@ -1,5 +1,6 @@
2.5 (Upcoming 2022) 2.5 (Upcoming 2022)
o Annotation /QuadPoints processed in addition to /Rect
o New operation -typeset typesets a text file as a PDF o New operation -typeset typesets a text file as a PDF
o New operation -table-of-contents makes table of contents from bookmarks o New operation -table-of-contents makes table of contents from bookmarks
o When adding text or graphics, may choose CYMK or Grey instead of RGB o When adding text or graphics, may choose CYMK or Grey instead of RGB

106
cpdf.ml
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@ -1920,84 +1920,56 @@ let transform_rect transform rect =
let maxy = fmax (fmax y0 y1) (fmax y2 y3) in let maxy = fmax (fmax y0 y1) (fmax y2 y3) in
Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy] Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy]
(*let transform_quadpoints transform quadpoints =*) let transform_quadpoint_single transform = function
| [x1; y1; x2; y2; x3; y3; x4; y4] ->
let x1, y1, x2, y2, x3, y3, x4, y4 =
Pdf.getnum x1, Pdf.getnum y1,
Pdf.getnum x2, Pdf.getnum y2,
Pdf.getnum x3, Pdf.getnum y3,
Pdf.getnum x4, Pdf.getnum y4
in
let (x1, y1) = Pdftransform.transform_matrix transform (x1, y1) in
let (x2, y2) = Pdftransform.transform_matrix transform (x2, y2) in
let (x3, y3) = Pdftransform.transform_matrix transform (x3, y3) in
let (x4, y4) = Pdftransform.transform_matrix transform (x4, y4) in
map (fun x -> Pdf.Real x) [x1; y1; x2; y2; x3; y3; x4; y4]
| qp ->
Printf.eprintf "Malformed /QuadPoints format: must be a multiple of 8 entries\n";
qp
(* FIXME: We probably discovered this was wrong and that it isn't needed, and let transform_quadpoints transform = function
removed it. But check this before actually removing the commented code | Pdf.Array qps ->
entirely. *) Pdf.Array (flatten (map (transform_quadpoint_single transform) (splitinto 8 qps)))
(* This is used to transform the BBox inside a form xobject representing an | qp ->
* annotation appearance.*) Printf.eprintf "Unknown or malformed /QuadPoints format %s\n" (Pdfwrite.string_of_pdf qp);
(*let transform_xobject_in_place pdf transform i = qp
Printf.printf "transforming xobject %i as part of annotation\n" i;
let obj = Pdf.lookup_obj pdf i in
match Pdf.lookup_direct pdf "/BBox" obj with
| Some bbox ->
Printf.printf "Found bbox %s\n" (Pdfwrite.string_of_pdf bbox);
let obj = Pdf.add_dict_entry obj "/BBox" (transform_rect transform bbox) in
Pdf.addobj_given_num pdf (i, obj)
| None -> ()*)
(* Apply transformations to any annotations in /Annots (i.e their /Rect entries) *) (* Apply transformations to any annotations in /Annots (i.e their /Rect and /QuadPoints entries) *)
let transform_annotations pdf transform rest = let transform_annotations pdf transform rest =
(*Printf.printf "in transform_annotations with transform %s\n" (Pdftransform.string_of_matrix transform);*)
match Pdf.lookup_direct pdf "/Annots" rest with match Pdf.lookup_direct pdf "/Annots" rest with
| Some (Pdf.Array annots) -> | Some (Pdf.Array annots) ->
(* Always indirect references, so alter in place *) (* Always indirect references, so alter in place *)
iter iter
(function (function
| Pdf.Indirect i -> | Pdf.Indirect i ->
(*Printf.printf "Found an annotation to modify...\n";*)
let annot = Pdf.lookup_obj pdf i in let annot = Pdf.lookup_obj pdf i in
let rect' = let rect' =
match Pdf.lookup_direct pdf "/Rect" annot with match Pdf.lookup_direct pdf "/Rect" annot with
Some rect -> transform_rect transform rect | Some rect -> transform_rect transform rect
| None -> raise (Pdf.PDFError "transform_annotations: no rect") | None -> raise (Pdf.PDFError "transform_annotations: no rect")
in in
(*let ap' = let quadpoints' =
match Pdf.lookup_direct pdf "/AP" annot with match Pdf.lookup_direct pdf "/QuadPoints" annot with
None -> None | Some qp -> Some (transform_quadpoints transform qp)
| Some dict -> Some dict | None -> None
in*) in
let annot = Pdf.add_dict_entry annot "/Rect" rect' in let annot = Pdf.add_dict_entry annot "/Rect" rect' in
(*begin match ap' with let annot =
None -> () match quadpoints' with
| Some (Pdf.Dictionary dict) -> | Some qp -> Pdf.add_dict_entry annot "/QuadPoints" qp
(* Each entry in the dictionary is either | None -> annot
* a) an indirect reference to a stream Form XObject in
* b) a direct or indirect dictionary with some entries, Pdf.addobj_given_num pdf (i, annot)
* each of which is an indirect reference to a stream. *)
(* We do this in place. *)
(* Make sure we never do an object more than once -- is this possible in a valid PDF anyway? *)
let seen_nums = Hashtbl.create 128 in
List.iter
(fun (k, v) ->
match v with
Pdf.Indirect i ->
if Hashtbl.find_opt seen_nums i = None then
begin
Printf.printf "%i not in hash table\n" i;
Hashtbl.add seen_nums i ();
transform_xobject_in_place pdf transform i
end
| _ -> let dict = Pdf.lookup_direct pdf k (Pdf.Dictionary dict) in
match dict with Some (Pdf.Dictionary dict) ->
List.iter
(fun (_, v) ->
match v with
Pdf.Indirect i ->
if Hashtbl.find_opt seen_nums i = None then
begin
Printf.printf "%i not in hash table\n" i;
Hashtbl.add seen_nums i ();
transform_xobject_in_place pdf transform i
end
| _ -> Printf.eprintf "Malformed /AP structure b%\n!"; ())
dict
| _ -> Printf.eprintf "Malformed /AP structure c\n%!"; ())
dict
| _ -> Printf.eprintf "Malformed /AP structure\n%!"; ()
end;*)
Pdf.addobj_given_num pdf (i, annot)
| _ -> Printf.eprintf "transform_annotations: not indirect\n%!") | _ -> Printf.eprintf "transform_annotations: not indirect\n%!")
annots annots
| _ -> () | _ -> ()