1013 lines
40 KiB
OCaml
1013 lines
40 KiB
OCaml
open Pdfutil
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open Cpdferror
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(*(* FIXME: Need to take account of inherited resources (among Xobjects and their children - pages
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are regularized upon loading). Would be nice to see a failing example first though.
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FIXME: What would happen if a pattern was used in a transforming and non-transforming way - we
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would have to dedupulicate - again, no failing example available. *)
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(* Transparency group soft masks appear to need altering with the inverse of
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the transformation matrix. We find them all, deduplicate, and then process
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in place. *)
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(* For each xobject, look in /Resources -> /ExtGState -> /G, and get object number. *)
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let rec change_softmask_matrices_xobject pdf xobject =
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let objnums = ref [] in
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begin match xobject with
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| Pdf.Indirect i ->
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let dict = Pdf.lookup_obj pdf i in
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begin match Pdf.lookup_direct pdf "/Resources" dict with
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| Some d ->
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begin match Pdf.lookup_direct pdf "/ExtGState" d with
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| Some (Pdf.Dictionary extgstates) ->
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iter
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(function extgstate ->
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match Pdf.direct pdf extgstate with
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| Pdf.Dictionary d ->
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begin match Pdf.lookup_direct pdf "/SMask" (Pdf.Dictionary d) with
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| Some (Pdf.Dictionary d) ->
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begin match lookup "/G" d with
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| Some (Pdf.Indirect i) ->
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objnums := i::!objnums
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| _ -> ()
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end
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| _ -> ()
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end
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| _ -> ())
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(map snd extgstates)
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| _ -> ()
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end
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| _ -> ()
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end
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| _ -> ()
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end;
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let subxobjects =
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match Pdf.lookup_direct pdf "/Resources" xobject with
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| Some d ->
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begin match Pdf.lookup_direct pdf "/XObject" d with
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| Some (Pdf.Dictionary d) -> map snd d
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| _ -> []
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end
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| _ -> []
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in
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let descendants =
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flatten (map (change_softmask_matrices_xobject pdf) subxobjects)
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in
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descendants @ !objnums
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let change_softmask_matrices_page pdf tr page =
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let xobjects =
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match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
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| Some (Pdf.Dictionary d) -> d
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| _ -> []
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in
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let objnums = setify (flatten (map (change_softmask_matrices_xobject pdf) (map snd xobjects))) in
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iter
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(fun objnum ->
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let dict = Pdf.lookup_obj pdf objnum in
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let matrix = Pdf.parse_matrix pdf "/Matrix" dict in
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let matrix' = Pdftransform.matrix_compose (Pdftransform.matrix_invert tr) matrix in
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let dict = Pdf.add_dict_entry dict "/Matrix" (Pdf.make_matrix matrix') in
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Pdf.addobj_given_num pdf (objnum, dict))
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objnums*)
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(* When we transform a page by wrapping in an [Op_cm], we must also
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change any /Matrix entries in (some) pattern dictionaries, including inside
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xobjects. We only change the ones used with scn, to avoid pattern dictionaries
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used in other ways, which must not be transformed. *)
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let patterns_used pdf content resources =
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let used = null_hash () in
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match Pdf.lookup_direct pdf "/Pattern" resources with
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| None -> used
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| Some _ ->
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let ops = Pdfops.parse_operators pdf resources content in
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iter
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(function Pdfops.Op_scnName (x, []) | Pdfops.Op_SCNName (x, []) -> Hashtbl.replace used x () | _ -> ())
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ops;
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used
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let pats_done = null_hash ()
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let rec change_pattern_matrices_resources pdf tr resources names_used_with_scn =
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begin match Pdf.lookup_direct pdf "/XObject" resources with
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| Some (Pdf.Dictionary elts) ->
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iter
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(fun (k, v) ->
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match v with
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| Pdf.Indirect i ->
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(*Printf.printf "Processing form xobject %s for patterns\n%!" k;*)
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change_pattern_matrices_xobject pdf tr v i
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| _ -> raise (Pdf.PDFError "change_pattern_matrices_page"))
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elts
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| _ -> ()
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end;
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begin match Pdf.lookup_direct pdf "/Pattern" resources with
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| Some (Pdf.Dictionary patterns) ->
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let entries =
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map
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(fun (name, p) ->
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match Hashtbl.find names_used_with_scn name with
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| exception Not_found -> (name, p)
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| _ ->
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(*Printf.printf "Changing matrices of pattern %s\n%!" name;*)
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let old_pattern = Pdf.direct pdf p in
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let new_pattern =
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let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in
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let new_tr = Pdftransform.matrix_compose tr existing_tr in
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Pdf.add_dict_entry old_pattern "/Matrix" (Pdf.make_matrix new_tr)
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in
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name, Pdf.Indirect (Pdf.addobj pdf new_pattern))
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patterns
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in
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Pdf.add_dict_entry resources "/Pattern" (Pdf.Dictionary entries)
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| _ -> resources
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end
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and change_pattern_matrices_xobject pdf tr xobj xobjnum =
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match xobj with
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| Pdf.Indirect i when (try ignore (Hashtbl.find pats_done i); true with Not_found -> false) -> ()
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| _ ->
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begin match xobj with Pdf.Indirect i -> Hashtbl.add pats_done i () | _ -> () end;
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let xobj = Pdf.direct pdf xobj in
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match Pdf.lookup_direct pdf "/Subtype" xobj with
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| Some (Pdf.Name "/Form") ->
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Pdfcodec.decode_pdfstream pdf xobj;
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let resources = match Pdf.lookup_direct pdf "/Resources" xobj with Some d -> d | None -> Pdf.Dictionary [] in
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let used = patterns_used pdf [xobj] resources in
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begin match Pdf.lookup_direct pdf "/Resources" xobj with
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| Some resources ->
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let xobj' =
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Pdf.add_dict_entry xobj "/Resources" (change_pattern_matrices_resources pdf tr resources used)
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in
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Pdf.addobj_given_num pdf (xobjnum, xobj')
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| _ -> ()
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end
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| _ -> ()
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let change_pattern_matrices_page pdf tr page =
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Hashtbl.clear pats_done;
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(*change_softmask_matrices_page pdf tr page;*)
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let used = patterns_used pdf page.Pdfpage.content page.Pdfpage.resources in
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(*Printf.printf "Patterns for translation, due to being used as cs / CS";
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Hashtbl.iter (fun x _ -> Printf.printf "%s " x) used;
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Printf.printf "\n%!";*)
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{page with Pdfpage.resources = change_pattern_matrices_resources pdf tr page.Pdfpage.resources used}
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(* Output information for each page *)
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exception Exceptjson of Cpdfyojson.Safe.t
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let output_page_info ?(json=false) ?(raisejson=false) pdf range =
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let pages = Pdfpage.pages_of_pagetree pdf in
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let labels = Pdfpagelabels.read pdf in
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let getbox page box =
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if box = "/MediaBox" then
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match page.Pdfpage.mediabox with
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| Pdf.Array [a; b; c; d] ->
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Printf.sprintf "%f %f %f %f"
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(Pdf.getnum pdf a) (Pdf.getnum pdf b) (Pdf.getnum pdf c) (Pdf.getnum pdf d)
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| _ -> ""
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else
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match Pdf.lookup_direct pdf box page.Pdfpage.rest with
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| Some (Pdf.Array [a; b; c; d]) ->
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Printf.sprintf "%f %f %f %f"
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(Pdf.getnum pdf a) (Pdf.getnum pdf b) (Pdf.getnum pdf c) (Pdf.getnum pdf d)
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| _ -> ""
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in
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let rotation page =
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Pdfpage.int_of_rotation page.Pdfpage.rotate
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in
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let num_annots page =
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match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
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| Some (Pdf.Array a) -> length a
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| _ -> 0
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in
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let json_entry_of_pnum pnum =
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let getbox_json page box =
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match getbox page box with
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| "" -> `Null
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| s ->
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let a, b, c, d = Cpdfcoord.parse_rectangle (Pdf.empty ()) s in
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`List [`Float a; `Float b; `Float c; `Float d]
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in
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let page = select pnum pages in
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`Assoc
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[("Page", `Int pnum);
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("Label", (`String (try Pdfpagelabels.pagelabeltext_of_pagenumber pnum labels with Not_found -> "")));
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("MediaBox", getbox_json page "/MediaBox");
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("CropBox", getbox_json page "/CropBox");
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("BleedBox", getbox_json page "/BleedBox");
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("TrimBox", getbox_json page "/TrimBox");
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("ArtBox", getbox_json page "/ArtBox");
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("Rotation", `Int (rotation page));
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("Annotations", `Int (num_annots page))]
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in
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if json then
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let thejson = `List (map json_entry_of_pnum range) in
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if raisejson then
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raise (Exceptjson thejson)
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else
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flprint (Cpdfyojson.Safe.pretty_to_string thejson)
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else
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iter
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(fun pnum ->
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let page = select pnum pages in
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Printf.printf "Page %i:\n" pnum;
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Printf.printf "Label: %s\n"
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(try Pdfpagelabels.pagelabeltext_of_pagenumber pnum labels with Not_found -> "");
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Printf.printf "MediaBox: %s\n" (getbox page "/MediaBox");
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Printf.printf "CropBox: %s\n" (getbox page "/CropBox");
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Printf.printf "BleedBox: %s\n" (getbox page "/BleedBox");
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Printf.printf "TrimBox: %s\n" (getbox page "/TrimBox");
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Printf.printf "ArtBox: %s\n" (getbox page "/ArtBox");
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Printf.printf "Rotation: %i\n" (rotation page);
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Printf.printf "Annotations: %i\n" (num_annots page))
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range
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let json_page_info pdf range =
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try output_page_info ~json:true ~raisejson:true pdf range; `List [] with
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Exceptjson j -> j
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let process_pages f pdf range =
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let pages = Pdfpage.pages_of_pagetree pdf in
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let pages', pagenumbers, matrices = (* new page objects, page number, matrix *)
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split3
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(map2
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(fun n p -> if mem n range then f n p else (p, n, Pdftransform.i_matrix))
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(ilist 1 (length pages))
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pages)
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in
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Pdfpage.change_pages ~matrices:(combine pagenumbers matrices) true pdf pages'
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let iter_pages f pdf range =
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let pages = Pdfpage.pages_of_pagetree pdf in
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iter2
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(fun n p -> if mem n range then f n p)
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(ilist 1 (length pages))
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pages
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let map_pages f pdf range =
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let pages = Pdfpage.pages_of_pagetree pdf in
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option_map2
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(fun n p -> if mem n range then Some (f n p) else None)
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(ilist 1 (length pages))
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pages
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(* Clip a page to one of its boxes, or the media box if that box is not
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* present. This is a hard clip, done by using a clipping rectangle, so that
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* the page may then be used as a stamp without extraneous material reapearing.
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* *)
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let hard_box pdf range boxname mediabox_if_missing fast =
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process_pages
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(Pdfpage.ppstub (fun pagenum page ->
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let minx, miny, maxx, maxy =
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if boxname = "/MediaBox" then
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Pdf.parse_rectangle pdf page.Pdfpage.mediabox
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else
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match Pdf.lookup_direct pdf boxname page.Pdfpage.rest with
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| Some a -> Pdf.parse_rectangle pdf a
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| _ ->
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if mediabox_if_missing
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then Pdf.parse_rectangle pdf page.Pdfpage.mediabox
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else error (Printf.sprintf "hard_box: box %s not found" boxname)
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in
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let ops = [Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny); Pdfops.Op_W; Pdfops.Op_n] in
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Pdfpage.prepend_operators pdf ops ~fast page))
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pdf
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range
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let shift_page ?(fast=false) dxdylist pdf pnum page =
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let dx, dy = List.nth dxdylist (pnum - 1) in
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let transform_op = Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy))) in
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let tr = Pdftransform.mktranslate dx dy in
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let page = change_pattern_matrices_page pdf tr page in
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Pdfannot.transform_annotations pdf tr page.Pdfpage.rest;
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(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, tr)
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let shift_pdf ?(fast=false) dxdylist pdf range =
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process_pages (shift_page ~fast dxdylist pdf) pdf range
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(* Shift page data *)
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let make_mediabox (xmin, ymin, xmax, ymax) =
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Pdf.Array
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[Pdf.Real xmin; Pdf.Real ymin; Pdf.Real xmax; Pdf.Real ymax]
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(* Change the media box and other known boxes by the function [f] which takes
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xmin, xmax, ymin, ymax as input. *)
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let change_boxes f pdf page =
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let names = ["/TrimBox"; "/ArtBox"; "/CropBox"; "/BleedBox"]
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in let getbox n =
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Pdf.lookup_direct pdf n page.Pdfpage.rest
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in
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let boxes = combine names (map getbox names) in
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let toreplace = lose (function (_, None) -> true | _ -> false) boxes in
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let toreplace =
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map
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(function (name, Some value) -> (name, value) | _ -> assert false)
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toreplace
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in
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let rest' =
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fold_left
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(fun e (k, v) ->
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let v =
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make_mediabox (f (Pdf.parse_rectangle pdf v))
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in
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Pdf.replace_dict_entry e k v)
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page.Pdfpage.rest
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toreplace
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in
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{page with
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Pdfpage.mediabox =
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make_mediabox (f (Pdf.parse_rectangle pdf page.Pdfpage.mediabox));
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Pdfpage.rest = rest'}
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let shift_boxes dxdylist pdf range =
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let dx, dy = match dxdylist with (a, b)::_ -> a, b | _ -> 0.0, 0.0 in
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let f (xmin, ymin, xmax, ymax) = (xmin +. dx, ymin +. dy, xmax +. dx, ymax +. dy) in
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let fpage _ p = change_boxes f pdf p in
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process_pages (Pdfpage.ppstub fpage) pdf range
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(* Scale contents *)
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let scale_page_contents ?(fast=false) scale position pdf pnum page =
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let (minx, miny, maxx, maxy) as box =
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(* Use cropbox if available *)
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Pdf.parse_rectangle
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pdf
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(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
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| Some r -> r
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| None -> page.Pdfpage.mediabox)
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in
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let sx, sy, _ = Cpdfposition.calculate_position true 0. box position in
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let tx, ty =
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let open Cpdfposition in
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match position with
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| Top t -> 0., -.t
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| TopLeft (a, b) -> a, -.b
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| TopRight (a, b) -> -.a, -.b
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| Left t -> t, 0.
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| BottomLeft (a, b) -> a, b
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| Bottom t -> 0., t
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| BottomRight (a, b) -> -.a, b
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| Right t -> -.t, 0.
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| _ -> 0., 0. (* centre it... FIXME: We will add a center position, eventually, for text and this... *)
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in
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let transform =
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Pdftransform.matrix_of_transform
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[Pdftransform.Translate (tx, ty);
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Pdftransform.Scale ((sx, sy), scale, scale)]
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in
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let transform_op = Pdfops.Op_cm transform in
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let page = change_pattern_matrices_page pdf transform page in
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Pdfannot.transform_annotations pdf transform page.Pdfpage.rest;
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(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, transform)
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let scale_contents ?(fast=false) position scale pdf range =
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process_pages (scale_page_contents ~fast scale position pdf) pdf range
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(* Set media box *)
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let set_mediabox xywhlist pdf range =
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let crop_page pnum page =
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let x, y, w, h = List.nth xywhlist (pnum - 1) in
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{page with
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Pdfpage.mediabox =
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(Pdf.Array
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[Pdf.Real x; Pdf.Real y;
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Pdf.Real (x +. w); Pdf.Real (y +. h)])}
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in
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process_pages (Pdfpage.ppstub crop_page) pdf range
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let remove_cropping_pdf pdf range =
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let remove_cropping_page _ page =
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{page with
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Pdfpage.rest =
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(Pdf.remove_dict_entry page.Pdfpage.rest "/CropBox")}
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in
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process_pages (Pdfpage.ppstub remove_cropping_page) pdf range
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let remove_trim_pdf pdf range =
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let remove_trim_page _ page =
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{page with
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Pdfpage.rest =
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(Pdf.remove_dict_entry page.Pdfpage.rest "/TrimBox")}
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in
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process_pages (Pdfpage.ppstub remove_trim_page) pdf range
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let remove_art_pdf pdf range =
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let remove_art_page _ page =
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{page with
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Pdfpage.rest =
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(Pdf.remove_dict_entry page.Pdfpage.rest "/ArtBox")}
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in
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process_pages (Pdfpage.ppstub remove_art_page) pdf range
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let remove_bleed_pdf pdf range =
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let remove_bleed_page _ page =
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{page with
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Pdfpage.rest =
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(Pdf.remove_dict_entry page.Pdfpage.rest "/BleedBox")}
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in
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process_pages (Pdfpage.ppstub remove_bleed_page) pdf range
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(* Upright functionality *)
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(* Return the pages from the pdf in the range, unordered. *)
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let select_pages range pdf =
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let pages = Pdfpage.pages_of_pagetree pdf in
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option_map (function n -> try Some (select n pages) with _ -> None) range
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(* If all pages are already upright, and the mediabox is (0,0)-based, do nothing
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to save time. *)
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let allupright range pdf =
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let page_is_upright page =
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page.Pdfpage.rotate = Pdfpage.Rotate0 &&
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(let (minx, miny, _, _) = Pdf.parse_rectangle pdf page.Pdfpage.mediabox in
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minx < 0.001 && miny < 0.001 && minx > ~-.0.001 && miny > ~-.0.001)
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in
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not (mem false (map page_is_upright (select_pages range pdf)))
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(* Same, but don't care about mediabox origin. This is for -scale-to-fit, now that
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it is ok with nonzero origins. *)
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let alluprightonly range pdf =
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let page_is_upright page = page.Pdfpage.rotate = Pdfpage.Rotate0 in
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not (mem false (map page_is_upright (select_pages range pdf)))
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let upright_transform pdf page =
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let rotate =
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Pdfpage.int_of_rotation page.Pdfpage.rotate
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and cx, cy =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle pdf page.Pdfpage.mediabox in
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(minx +. maxx) /. 2., (miny +. maxy) /. 2.
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in
|
|
Pdftransform.mkrotate (cx, cy) (rad_of_deg (~-.(float rotate)))
|
|
|
|
let transform_boxes tr pdf page =
|
|
let f (minx, miny, maxx, maxy) =
|
|
let minx, miny = Pdftransform.transform_matrix tr (minx, miny)
|
|
and maxx, maxy = Pdftransform.transform_matrix tr (maxx, maxy) in
|
|
(minx, miny, maxx, maxy)
|
|
in
|
|
change_boxes f pdf page
|
|
|
|
let transform_contents ?(fast=false) tr pdf page =
|
|
let transform_op = Pdfops.Op_cm tr in
|
|
let page = change_pattern_matrices_page pdf tr page in
|
|
Pdfannot.transform_annotations pdf tr page.Pdfpage.rest;
|
|
Pdfpage.prepend_operators pdf [transform_op] ~fast page
|
|
|
|
(* Change a page's media box so its minimum x and y are 0, making other
|
|
operations simpler to think about. Any shift that is done is reflected in
|
|
other boxes (clip etc.) *)
|
|
let rectify_boxes ?(fast=false) pdf page =
|
|
let minx, miny, _, _ =
|
|
Pdf.parse_rectangle pdf page.Pdfpage.mediabox
|
|
in
|
|
let f (iminx, iminy, imaxx, imaxy) =
|
|
iminx -. minx, iminy -. miny, imaxx -. minx, imaxy -. miny
|
|
in
|
|
let page = change_boxes f pdf page in
|
|
if minx <> 0. || miny <> 0.
|
|
then
|
|
begin let p, _, _ = shift_page ~fast [(-.minx),(-.miny)] pdf 1 page in p end
|
|
else page
|
|
|
|
let upright ?(fast=false) range pdf =
|
|
if allupright range pdf then pdf else
|
|
let upright_page _ pnum page =
|
|
let tr = upright_transform pdf page in
|
|
let page = transform_boxes tr pdf page in
|
|
let page = transform_contents ~fast tr pdf page in
|
|
(rectify_boxes ~fast pdf {page with Pdfpage.rotate = Pdfpage.Rotate0}, pnum, tr)
|
|
in
|
|
process_pages (upright_page pdf) pdf range
|
|
|
|
(* Rotating pages *)
|
|
let rotate_pdf r pdf range =
|
|
let rotate_page _ page =
|
|
{page with Pdfpage.rotate =
|
|
Pdfpage.rotation_of_int r}
|
|
in
|
|
process_pages (Pdfpage.ppstub rotate_page) pdf range
|
|
|
|
let rotate_pdf_by r pdf range =
|
|
let rotate_page_by _ page =
|
|
{page with Pdfpage.rotate =
|
|
Pdfpage.rotation_of_int ((Pdfpage.int_of_rotation page.Pdfpage.rotate + r) mod 360)}
|
|
in
|
|
process_pages (Pdfpage.ppstub rotate_page_by) pdf range
|
|
|
|
let rotate_page_contents ~fast rotpoint r pdf pnum page =
|
|
let rotation_point =
|
|
match rotpoint with
|
|
| None ->
|
|
let minx, miny, maxx, maxy = Pdf.parse_rectangle pdf page.Pdfpage.mediabox in
|
|
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
|
|
| Some point -> point
|
|
in
|
|
let tr =
|
|
Pdftransform.matrix_of_op (Pdftransform.Rotate (rotation_point, -.(rad_of_deg r)))
|
|
in
|
|
let transform_op = Pdfops.Op_cm tr in
|
|
let page = change_pattern_matrices_page pdf tr page in
|
|
Pdfannot.transform_annotations pdf tr page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, tr)
|
|
|
|
let rotate_contents ?(fast=false) r pdf range =
|
|
process_pages (rotate_page_contents ~fast None r pdf) pdf range
|
|
|
|
(* Scale page data *)
|
|
let scale_pdf ?(fast=false) sxsylist pdf range =
|
|
let scale_page pnum page =
|
|
let sx, sy = List.nth sxsylist (pnum - 1) in
|
|
let f (xmin, ymin, xmax, ymax) =
|
|
xmin *. sx, ymin *. sy, xmax *. sx, ymax *. sy
|
|
in
|
|
let page = change_boxes f pdf page
|
|
and matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), sx, sy)) in
|
|
let transform_op =
|
|
Pdfops.Op_cm matrix
|
|
in let page =
|
|
change_pattern_matrices_page pdf matrix page
|
|
in
|
|
Pdfannot.transform_annotations pdf matrix page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf ~fast [transform_op] page, pnum, matrix)
|
|
in
|
|
process_pages scale_page pdf range
|
|
|
|
(* Scale without regard to aspect ratio. *)
|
|
let stretch ?(fast=false) sxsylist pdf range =
|
|
let stretch_page pnum page =
|
|
let sx, sy = List.nth sxsylist (pnum - 1) in
|
|
let (minx, miny, maxx, maxy) =
|
|
Pdf.parse_rectangle
|
|
pdf
|
|
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
|
|
| Some r -> r
|
|
| None -> page.Pdfpage.mediabox)
|
|
in
|
|
let scale_x, scale_y = sx /. (maxx -. minx), sy /. (maxy -. miny) in
|
|
let f (xmin, ymin, xmax, ymax) = xmin *. scale_x, ymin *. scale_y, xmax *. scale_x, ymax *. scale_y in
|
|
let page = change_boxes f pdf page in
|
|
let matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), scale_x, scale_y)) in
|
|
let transform_op = Pdfops.Op_cm matrix in
|
|
let page = change_pattern_matrices_page pdf matrix page in
|
|
Pdfannot.transform_annotations pdf matrix page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf ~fast [transform_op] page, pnum, matrix)
|
|
in
|
|
process_pages stretch_page pdf range
|
|
|
|
(* Scale to fit page of size x * y *)
|
|
let scale_to_fit_pdf ?(fast=false) position input_scale xylist op pdf range =
|
|
let scale_page_to_fit pnum page =
|
|
let x, y = List.nth xylist (pnum - 1) in
|
|
let matrix =
|
|
let (minx, miny, maxx, maxy) =
|
|
Pdf.parse_rectangle
|
|
pdf
|
|
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
|
|
| Some r -> r
|
|
| None -> page.Pdfpage.mediabox)
|
|
in
|
|
if maxx <= 0. || maxy <= 0. then failwith "Zero-sized pages are invalid" else
|
|
let fx = x /. (maxx -. minx) in let fy = y /. (maxy -. miny) in
|
|
let scale = fmin fx fy *. input_scale in
|
|
let trans_x = (x -. (maxx *. scale)) /. 2. in
|
|
let trans_y = (y -. (maxy *. scale)) /. 2. in
|
|
let fixup_trans_x = -. (minx *. scale) /. 2. in
|
|
let fixup_trans_y = -. (miny *. scale) /. 2. in
|
|
let position_trans_x =
|
|
let dx = (x -. ((maxx -. minx) *. scale)) /. 2. in
|
|
match position with
|
|
| Cpdfposition.Left _ -> ~-. dx
|
|
| Cpdfposition.Right _ -> dx
|
|
| _ -> 0.
|
|
in
|
|
let position_trans_y =
|
|
let dy = (y -. ((maxy -. miny) *. scale)) /. 2. in
|
|
match position with
|
|
| Cpdfposition.Top _ -> dy
|
|
| Cpdfposition.Bottom _ -> ~-. dy
|
|
| _ -> 0.
|
|
in
|
|
(Pdftransform.matrix_of_transform
|
|
[Pdftransform.Translate (fixup_trans_x, fixup_trans_y);
|
|
Pdftransform.Translate (position_trans_x, position_trans_y);
|
|
Pdftransform.Translate (trans_x, trans_y);
|
|
Pdftransform.Scale ((0., 0.), scale, scale)])
|
|
in
|
|
let page =
|
|
change_boxes
|
|
(function (minx, miny, maxx, maxy) -> 0., 0., x, y)
|
|
pdf page
|
|
in
|
|
Pdfannot.transform_annotations pdf matrix page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast
|
|
(change_pattern_matrices_page pdf matrix page), pnum, matrix)
|
|
in
|
|
process_pages scale_page_to_fit pdf range
|
|
|
|
(* Add stack operators to a content stream to ensure it is composeable. On
|
|
-fast, we don't check for Q deficit, assuming PDF is ISO. *)
|
|
let protect fast pdf resources content =
|
|
let deficit =
|
|
if fast then 0 else
|
|
let ops = Pdfops.parse_operators pdf resources content in
|
|
let qs = length (keep (eq Pdfops.Op_q) ops) in
|
|
let bigqs = length (keep (eq Pdfops.Op_Q) ops) in
|
|
let deficit = if qs > bigqs then qs - bigqs else 0 in
|
|
if deficit <> 0 then Pdfe.log (Printf.sprintf "Q Deficit was nonzero. Fixing. %i\n" deficit);
|
|
deficit
|
|
in
|
|
let addstream ops = Pdf.addobj pdf (Pdfops.stream_of_ops ops) in
|
|
let q = addstream [Pdfops.Op_q] in
|
|
let qs = addstream (many Pdfops.Op_Q deficit @ [Pdfops.Op_Q]) in
|
|
[Pdf.Indirect q] @ content @ [Pdf.Indirect qs]
|
|
|
|
(* Does the page have a defined box e.g "/CropBox" *)
|
|
let hasbox pdf page boxname =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
if page > length pages || page < 1 then raise (Failure "hasbox: bad page") else
|
|
let p = select page pages in
|
|
match Pdf.lookup_direct pdf boxname p.Pdfpage.rest with
|
|
| Some _ -> true
|
|
| _ -> false
|
|
|
|
(* Flip pages *)
|
|
let flip_page ?(fast=false) transform_op pdf pnum page =
|
|
let minx, miny, maxx, maxy =
|
|
Pdf.parse_rectangle pdf page.Pdfpage.mediabox
|
|
in
|
|
let tr = transform_op minx miny maxx maxy in
|
|
let page = change_pattern_matrices_page pdf tr page in
|
|
Pdfannot.transform_annotations pdf tr page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast page, pnum, tr)
|
|
|
|
let vflip_pdf ?(fast=false) pdf range =
|
|
let transform_op _ miny _ maxy =
|
|
Pdftransform.matrix_of_op
|
|
(Pdftransform.Scale ((0., ((miny +. maxy) /. 2.)), 1., -.1.))
|
|
in
|
|
process_pages (flip_page ~fast transform_op pdf) pdf range
|
|
|
|
let hflip_pdf ?(fast=false) pdf range =
|
|
let transform_op minx _ maxx _ =
|
|
Pdftransform.matrix_of_op
|
|
(Pdftransform.Scale (((minx +. maxx) /. 2., 0.), -.1., 1.))
|
|
in
|
|
process_pages (flip_page ~fast transform_op pdf) pdf range
|
|
|
|
let stamp_shift_of_position topline midline sw sh w h p =
|
|
let half x = x /. 2.
|
|
and dy =
|
|
if midline then sh /. 2.
|
|
else if topline then sh
|
|
else 0.
|
|
in
|
|
let open Cpdfposition in
|
|
match p with
|
|
| PosCentre (ox, oy) -> ox -. half sw, oy -. dy
|
|
| PosLeft (ox, oy) -> ox, oy -. dy
|
|
| PosRight (ox, oy) -> ox -. sw, oy -. dy
|
|
| Top o -> half w -. half sw, h -. o -. sh -. dy
|
|
| TopLeft (a, b) -> a, h -. sh -. b -. dy
|
|
| TopRight (a, b) -> w -. sw -. a, h -. sh -. b -. dy
|
|
| Left o -> o, half h -. half sh -. dy
|
|
| BottomLeft (a, b) -> a, b -. dy
|
|
| Bottom o -> half w -. half sw, o -. dy
|
|
| BottomRight (a, b) -> w -. sw -. a, b -. dy
|
|
| Right o -> w -. sw -. o, half h -. half sh -. dy
|
|
| Diagonal | ReverseDiagonal | Centre ->
|
|
half w -. half sw, half h -. half sh -. dy
|
|
|
|
(* Combine Pdfpage.rest items for two PDFs. For now, we combine /Annots, and
|
|
* copy everything else from adict. What else should we combine? *)
|
|
let combine_page_items pdf adict bdict =
|
|
let getannots dict =
|
|
begin match dict with
|
|
Pdf.Dictionary d ->
|
|
begin match lookup "/Annots" d with
|
|
Some (Pdf.Array items) -> items
|
|
| _ -> []
|
|
end
|
|
| _ -> []
|
|
end
|
|
in
|
|
let a_annots = getannots adict in
|
|
let b_annots = getannots bdict in
|
|
match a_annots @ b_annots with
|
|
[] -> adict
|
|
| annots -> Pdf.add_dict_entry adict "/Annots" (Pdf.Array annots)
|
|
|
|
let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isover pdf o u opdf =
|
|
(* Scale page stamp o to fit page u *)
|
|
let sxmin, symin, sxmax, symax =
|
|
Pdf.parse_rectangle
|
|
pdf
|
|
(match Pdf.lookup_direct pdf "/CropBox" o.Pdfpage.rest with | Some r -> r | None -> o.Pdfpage.mediabox)
|
|
in let txmin, tymin, txmax, tymax =
|
|
Pdf.parse_rectangle
|
|
pdf
|
|
(match Pdf.lookup_direct pdf "/CropBox" u.Pdfpage.rest with | Some r -> r | None -> u.Pdfpage.mediabox)
|
|
in
|
|
let o =
|
|
if scale_to_fit then
|
|
let xmag = (txmax -. txmin) /. (sxmax -. sxmin) in
|
|
let ymag = (tymax -. tymin) /. (symax -. symin) in
|
|
let scale =
|
|
if xmag < 0.999 && ymag < 0.999 then
|
|
if xmag > ymag then xmag else ymag
|
|
else if xmag >= 1.001 && ymag >= 1.001 then
|
|
if xmag > ymag then ymag else xmag
|
|
else if xmag >= 1.001 then ymag
|
|
else xmag
|
|
in
|
|
let dx = txmin +. ((txmax -. txmin) -. (sxmax -. sxmin) *. scale) /. 2. in
|
|
let dy = tymin +. ((tymax -. tymin) -. (symax -. symin) *. scale) /. 2. in
|
|
let matrix =
|
|
(Pdftransform.matrix_of_transform
|
|
([Pdftransform.Translate (dx, dy)] @
|
|
(if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @
|
|
[Pdftransform.Scale ((sxmin, symin), scale, scale)]))
|
|
in
|
|
Pdfannot.transform_annotations pdf matrix o.Pdfpage.rest;
|
|
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
|
|
change_pattern_matrices_page pdf matrix r
|
|
else
|
|
let sw = sxmax -. sxmin and sh = symax -. symin
|
|
and w = txmax -. txmin and h = tymax -. tymin in
|
|
let dx, dy = stamp_shift_of_position topline midline sw sh w h position in
|
|
let matrix =
|
|
(Pdftransform.matrix_of_transform
|
|
((if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @
|
|
[Pdftransform.Translate (dx, dy)]))
|
|
in
|
|
Pdfannot.transform_annotations pdf matrix o.Pdfpage.rest;
|
|
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
|
|
change_pattern_matrices_page pdf matrix r
|
|
in
|
|
{u with
|
|
Pdfpage.content =
|
|
(if isover then ( @ ) else ( @@ ))
|
|
(protect fast pdf u.Pdfpage.resources u.Pdfpage.content)
|
|
(protect fast pdf o.Pdfpage.resources o.Pdfpage.content);
|
|
Pdfpage.rest =
|
|
combine_page_items pdf u.Pdfpage.rest o.Pdfpage.rest;
|
|
Pdfpage.resources =
|
|
Pdfpage.combine_pdf_resources pdf u.Pdfpage.resources o.Pdfpage.resources}
|
|
|
|
let stamp relative_to_cropbox position topline midline fast scale_to_fit isover range over pdf =
|
|
let prefix = Pdfpage.shortest_unused_prefix pdf in
|
|
Pdfpage.add_prefix over prefix;
|
|
let marks = Pdfmarks.read_bookmarks pdf in
|
|
let marks_refnumbers = Pdf.page_reference_numbers pdf in
|
|
let pdf = Pdfmarks.remove_bookmarks pdf in
|
|
let over = Pdfmarks.remove_bookmarks over in
|
|
let pageseqs = ilist 1 (Pdfpage.endpage pdf) in
|
|
let over_firstpage_pdf =
|
|
match Pdfpage.pages_of_pagetree over with
|
|
| [] -> error "empty PDF"
|
|
| h::_ -> Pdfpage.change_pages ~changes:[(1, 1)] true over [h]
|
|
in
|
|
let merged =
|
|
Pdfmerge.merge_pdfs
|
|
false false ["a"; "b"] [pdf; over_firstpage_pdf] [pageseqs; [1]]
|
|
in
|
|
let merged =
|
|
{merged with Pdf.saved_encryption = pdf.Pdf.saved_encryption}
|
|
in
|
|
let merged = Cpdfmetadata.copy_id true pdf merged in
|
|
let merged_pages = Pdfpage.pages_of_pagetree merged in
|
|
let under_pages, over_page =
|
|
all_but_last merged_pages, last merged_pages
|
|
in
|
|
let new_pages =
|
|
map2
|
|
(fun pageseq under_page ->
|
|
do_stamp relative_to_cropbox fast position topline midline scale_to_fit isover merged
|
|
(if mem pageseq range then over_page else
|
|
Pdfpage.blankpage Pdfpaper.a4)
|
|
under_page over)
|
|
pageseqs
|
|
under_pages
|
|
in
|
|
let changed =
|
|
let changes =
|
|
map (fun x -> (x, x)) (ilist 1 (length new_pages))
|
|
in
|
|
Pdfpage.change_pages ~changes true merged new_pages
|
|
in
|
|
let new_refnumbers = Pdf.page_reference_numbers changed in
|
|
let changetable = hashtable_of_dictionary (combine marks_refnumbers new_refnumbers) in
|
|
let new_marks = map (Cpdfbookmarks.change_bookmark changetable) marks in
|
|
Pdfmarks.add_bookmarks new_marks changed
|
|
|
|
(* Combine pages from two PDFs. For now, assume equal length. FIXME: Why? *)
|
|
|
|
(* If [over] has more pages than [under], chop the excess. If the converse, pad
|
|
[over] to the same length *)
|
|
let equalize_pages under over =
|
|
let length_under = Pdfpage.endpage under in
|
|
let length_over = Pdfpage.endpage over in
|
|
if length_over > length_under then
|
|
let changes =
|
|
map (fun x -> (x, x)) (ilist 1 length_under)
|
|
in
|
|
(under,
|
|
(Pdfpage.change_pages
|
|
~changes true over (take (Pdfpage.pages_of_pagetree over) length_under)))
|
|
else if length_under > length_over then
|
|
let changes =
|
|
map (fun x -> (x, x)) (ilist 1 length_over)
|
|
in
|
|
(under,
|
|
Pdfpage.change_pages
|
|
~changes true over
|
|
(Pdfpage.pages_of_pagetree over @
|
|
(many (Pdfpage.blankpage Pdfpaper.a4) (length_under - length_over))))
|
|
else
|
|
under, over
|
|
|
|
let combine_pages fast under over scaletofit swap equalize =
|
|
let debug_combine_pages = false in
|
|
let debug_pdf pdf n =
|
|
if debug_combine_pages then
|
|
begin Pdf.remove_unreferenced pdf; Pdfwrite.pdf_to_file pdf n end
|
|
in
|
|
Pdfpage.add_prefix over (Pdfpage.shortest_unused_prefix under);
|
|
let marks_under, marks_over = Pdfmarks.read_bookmarks under, Pdfmarks.read_bookmarks over in
|
|
let under, over = if equalize then equalize_pages under over else under, over in
|
|
let under_length, over_length = Pdfpage.endpage under, Pdfpage.endpage over in
|
|
if under_length <> over_length then
|
|
raise (Pdf.PDFError "combine_pages: not of equal length")
|
|
else
|
|
let pageseqs_under = ilist 1 (Pdfpage.endpage under) in
|
|
let pageseqs_over = ilist 1 (Pdfpage.endpage over) in
|
|
let merged =
|
|
Pdfmerge.merge_pdfs
|
|
false false ["a"; "b"] [under; over] [pageseqs_under; pageseqs_over]
|
|
in
|
|
debug_pdf merged "merged.pdf";
|
|
let under_pages, over_pages =
|
|
cleave (Pdfpage.pages_of_pagetree merged) under_length
|
|
in
|
|
let new_pages =
|
|
map2
|
|
(fun o u ->
|
|
do_stamp
|
|
false fast (BottomLeft (0., 0.)) false false scaletofit (not swap) merged o u over)
|
|
over_pages under_pages
|
|
in
|
|
(* Build the changes. 123456 -> 123123 *)
|
|
let changes =
|
|
let len = length new_pages in
|
|
combine (ilist 1 (len * 2)) (let x = ilist 1 len in x @ x)
|
|
in
|
|
let changed = Pdfpage.change_pages ~changes true merged new_pages in
|
|
let r = Pdfmarks.add_bookmarks (marks_under @ marks_over) changed in
|
|
debug_pdf r "final.pdf";
|
|
r
|
|
|
|
|
|
(* Just used by cpdflib for historical reasons *)
|
|
let setBox box minx maxx miny maxy pdf range =
|
|
let set_box_page _ page =
|
|
{page with
|
|
Pdfpage.rest =
|
|
Pdf.add_dict_entry
|
|
page.Pdfpage.rest box
|
|
(Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy])}
|
|
in
|
|
process_pages (Pdfpage.ppstub set_box_page) pdf range
|
|
|
|
(* Cropping *)
|
|
let crop_pdf ?(box="/CropBox") xywhlist pdf range =
|
|
let crop_page pagenum page =
|
|
{page with
|
|
Pdfpage.rest =
|
|
(Pdf.add_dict_entry
|
|
page.Pdfpage.rest
|
|
box
|
|
(let x, y, w, h = List.nth xywhlist (pagenum - 1) in
|
|
(Pdf.Array
|
|
[Pdf.Real x; Pdf.Real y;
|
|
Pdf.Real (x +. w); Pdf.Real (y +. h)])))}
|
|
in
|
|
process_pages (Pdfpage.ppstub crop_page) pdf range
|
|
|
|
(* Add rectangles on top of pages to show Media, Crop, Art, Trim, Bleed boxes.
|
|
*
|
|
* We use different dash lengths and colours to help distinguish coincident
|
|
* boxes The sequence of operators is postpended to the page content,
|
|
* appropriately protected to prevent pollution of matrices.
|
|
*
|
|
* /MediaBox: Solid red line
|
|
* /CropBox: Dashed 7 on 7 off green line
|
|
* /ArtBox: Dashed 5 on 5 off blue line
|
|
* /TrimBox: Dashed 3 on 3 off orange line
|
|
* /BleedBox: Dashed 2 on 2 off pink line *)
|
|
let get_rectangle pdf page box =
|
|
if box = "/MediaBox" then
|
|
match page.Pdfpage.mediabox with
|
|
Pdf.Array [a; b; c; d] as r -> Some (Pdf.parse_rectangle pdf r)
|
|
| _ -> None
|
|
else
|
|
match Pdf.lookup_direct pdf box page.Pdfpage.rest with
|
|
Some (Pdf.Array [a; b; c; d] as r) -> Some (Pdf.parse_rectangle pdf r)
|
|
| _ -> None
|
|
|
|
let show_boxes_page fast pdf _ page =
|
|
let make_ops (r, g, b) on off boxname =
|
|
match get_rectangle pdf page boxname with
|
|
Some (r1, r2, r3, r4) ->
|
|
[Pdfops.Op_q;
|
|
Pdfops.Op_RG (r /. 255., g /. 255., b /. 255.);
|
|
Pdfops.Op_w 1.;
|
|
Pdfops.Op_d ((if on = 0. && off = 0. then [] else [on; off]), 0.);
|
|
Pdfops.Op_re (r1, r2, r3 -. r1, r4 -. r2);
|
|
Pdfops.Op_S;
|
|
Pdfops.Op_Q]
|
|
| None -> []
|
|
in
|
|
let ops =
|
|
make_ops (255., 0., 0.) 0. 0. "/MediaBox"
|
|
@ make_ops (0., 255., 0.) 7. 7. "/CropBox"
|
|
@ make_ops (0., 0., 255.) 5. 5. "/ArtBox"
|
|
@ make_ops (255.,150.,0.) 3. 3. "/TrimBox"
|
|
@ make_ops (255.,9.,147.) 2. 2. "/BleedBox"
|
|
in
|
|
Pdfpage.postpend_operators pdf ops ~fast page
|
|
|
|
let show_boxes ?(fast=false) pdf range =
|
|
process_pages (Pdfpage.ppstub (show_boxes_page fast pdf)) pdf range
|
|
|
|
let allowance = 9.
|
|
|
|
let line (x0, y0, x1, y1) =
|
|
[Pdfops.Op_m (x0, y0);
|
|
Pdfops.Op_l (x1, y1);
|
|
Pdfops.Op_s]
|
|
|
|
let trim_marks_page fast pdf n page =
|
|
match get_rectangle pdf page "/TrimBox", get_rectangle pdf page "/MediaBox" with
|
|
| Some (tminx, tminy, tmaxx, tmaxy), Some (minx, miny, maxx, maxy) ->
|
|
let ops =
|
|
[Pdfops.Op_q;
|
|
Pdfops.Op_K (1., 1., 1., 1.);
|
|
Pdfops.Op_w 1.]
|
|
@ line (minx, tmaxy, tminy -. allowance, tmaxy) (* top left *)
|
|
@ line (tminx, tmaxy +. allowance, tminx, maxy)
|
|
@ line (tmaxx +. allowance, tmaxy, maxx, tmaxy) (* top right *)
|
|
@ line (tmaxx, tmaxy +. allowance, tmaxx, maxy)
|
|
@ line (tmaxx +. allowance, tminy, maxx, tminy) (* bottom right *)
|
|
@ line (tmaxx, tminy -. allowance, tmaxx, miny)
|
|
@ line (tminx -. allowance, tminy, minx, tminy) (* bottom left *)
|
|
@ line (tminx, tminy -. allowance, tminx, miny)
|
|
@ [Pdfops.Op_Q]
|
|
in
|
|
Pdfpage.postpend_operators pdf ops ~fast page
|
|
| _, _ ->
|
|
(*Pdfe.log (Printf.sprintf "warning: no /TrimBox found on page %i\n" n);*)
|
|
page
|
|
|
|
let trim_marks ?(fast=false) pdf range =
|
|
process_pages (Pdfpage.ppstub (trim_marks_page fast pdf)) pdf range
|
|
|
|
(* copy the contents of the box f to the box t. If mediabox_if_missing is set,
|
|
the contents of the mediabox will be used if the from fox is not available. If
|
|
mediabox_is_missing is false, the page is unaltered. *)
|
|
let copy_box f t mediabox_if_missing pdf range =
|
|
process_pages
|
|
(Pdfpage.ppstub (fun _ page ->
|
|
if f = "/MediaBox" then
|
|
{page with Pdfpage.rest =
|
|
(Pdf.add_dict_entry page.Pdfpage.rest t (page.Pdfpage.mediabox))}
|
|
else
|
|
match Pdf.lookup_direct pdf f page.Pdfpage.rest with
|
|
| Some pdfobject ->
|
|
if t = "/MediaBox"
|
|
then {page with
|
|
Pdfpage.mediabox = Pdf.direct pdf pdfobject}
|
|
else {page with Pdfpage.rest =
|
|
(Pdf.add_dict_entry page.Pdfpage.rest t (Pdf.direct pdf pdfobject))}
|
|
| None ->
|
|
if mediabox_if_missing
|
|
then {page with Pdfpage.rest = Pdf.add_dict_entry page.Pdfpage.rest t page.Pdfpage.mediabox}
|
|
else page))
|
|
pdf
|
|
range
|
|
|
|
(* TODO: Trim structure tree *)
|
|
let redact pdf range =
|
|
process_pages
|
|
(Pdfpage.ppstub
|
|
(fun pnum page ->
|
|
if mem pnum range then
|
|
{page with
|
|
Pdfpage.content = [];
|
|
Pdfpage.resources = Pdf.Dictionary [];
|
|
Pdfpage.rest = Pdf.remove_dict_entry page.Pdfpage.rest "/Annots"}
|
|
else
|
|
page))
|
|
pdf
|
|
range
|