808 lines
31 KiB
OCaml
808 lines
31 KiB
OCaml
open Pdfutil
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open Cpdferror
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let do_add_artifacts = ref true
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let do_auto_tag = ref true
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let rolemap = ref ""
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type colspec =
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NoCol
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| RGB of float * float * float
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| Grey of float
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| CYMK of float * float * float * float
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type justification =
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Left | Right | Centre
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type drawops =
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| Rect of float * float * float * float
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| Bezier of float * float * float * float * float * float
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| Bezier23 of float * float * float * float
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| Bezier13 of float * float * float * float
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| To of float * float
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| Line of float * float
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| ClosePath
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| SetFill of colspec
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| SetStroke of colspec
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| SetLineThickness of float
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| SetLineCap of int
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| SetLineJoin of int
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| SetMiterLimit of float
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| SetDashPattern of float list * float
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| Matrix of Pdftransform.transform_matrix
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| Qq of drawops list
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| Fill
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| FillEvenOdd
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| Stroke
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| FillStroke
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| FillStrokeEvenOdd
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| Clip
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| ClipEvenOdd
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| FormXObject of float * float * float * float * string * drawops list
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| Use of string
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| ImageXObject of string * Pdf.pdfobject
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| Image of string
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| NewPage
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| Opacity of float
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| SOpacity of float
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| FontPack of string * Cpdfembed.cpdffont * (int, unit) Hashtbl.t
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| Font of string * float
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| TextSection of drawops list
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| Text of string
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| SpecialText of string
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| Para of float option * justification * float * string list
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| Newline
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| Leading of float
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| CharSpace of float
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| WordSpace of float
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| TextScale of float
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| RenderMode of int
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| Rise of float
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| Tag of string
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| EndTag
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| STag of string
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| EndSTag
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| BeginArtifact
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| EndArtifact
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| Namespace of string
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| EltInfo of string * Pdf.pdfobject
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| EndEltInfo of string
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| AutoTag of bool
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let rec string_of_drawop = function
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| Qq o -> "Qq (" ^ string_of_drawops o ^ ")"
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| FormXObject (_, _, _, _, _, o) -> "FormXObject (" ^ string_of_drawops o ^ ")"
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| TextSection o -> "TextSection (" ^ string_of_drawops o ^ ")"
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| Rect _ -> "Rect" | Bezier _ -> "Bezier" | Bezier23 _ -> "Bezier23"
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| Bezier13 _ -> "Bezier13" | To _ -> "To" | Line _ -> "Line"
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| ClosePath -> "ClosePath" | SetFill _ -> "SetFill" | SetStroke _ -> "SetStroke"
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| SetLineThickness _ -> "SetLineThickness" | SetLineCap _ -> "SetLineCap"
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| SetLineJoin _ -> "SetLineJoin" | SetMiterLimit _ -> "SetMiterLimit"
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| SetDashPattern _ -> "SetDashPattern" | Matrix _ -> "SetMatrix"
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| Fill -> "Fill" | FillEvenOdd -> "FillEvenOdd" | Stroke -> "Stroke"
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| FillStroke -> "FillStroke" | FillStrokeEvenOdd -> "FillStrokeEvenOdd"
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| Clip -> "Clip" | ClipEvenOdd -> "ClipEvenOdd" | Use _ -> "Use"
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| ImageXObject _ -> "ImageXObject" | Image _ -> "Image" | NewPage -> "NewPage"
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| Opacity _ -> "Opacity" | SOpacity _ -> "SOpacity" | FontPack (n, _, _) -> "FontPack " ^ n ^ " "
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| Font (f, _) -> "Font " ^ f ^ " " | Text _ -> "Text" | SpecialText _ -> "SpecialText"
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| Newline -> "Newline" | Leading _ -> "Leading" | CharSpace _ -> "CharSpace"
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| WordSpace _ -> "WordSpace" | TextScale _ -> "TextScale"
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| RenderMode _ -> "RenderMode" | Rise _ -> "Rise"
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| EndTag -> "EndTag" | Tag s -> "Tag " ^ s | EndSTag -> "EndSTag" | STag s -> "Tag " ^ s
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| BeginArtifact -> "BeginArtifact" | EndArtifact -> "EndArtifact"
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| Para (_, _, _, _) -> "Para" | Namespace s -> "Namespace " ^ s
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| EltInfo (_, _) -> "EltInfo" | EndEltInfo _ -> "EndEltInfo"
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| AutoTag _ -> "AutoTag"
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and string_of_drawops l =
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fold_left (fun x y -> x ^ " " ^ y) "" (map string_of_drawop l)
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(* Per page / xobject resources *)
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type res =
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{images : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
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extgstates : ((string * float), string) Hashtbl.t; (* (kind, value), name *)
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fonts : (string * int, (string * int)) Hashtbl.t; (* (font, (objnum, pdf name)) *)
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form_xobjects : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
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mutable page_names : string list;
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mutable time : Cpdfstrftime.t;
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mutable current_fontpack : string * Cpdfembed.t;
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mutable current_fontpack_codepoints : (int, unit) Hashtbl.t;
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mutable font_size : float;
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mutable num : int}
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let default_fontpack =
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Cpdfembed.fontpack_of_standardfont
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(Pdftext.StandardFont (Pdftext.TimesRoman, Pdftext.WinAnsiEncoding))
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let fontpacks = ref (null_hash ())
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let empty_res () =
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{images = null_hash ();
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extgstates = null_hash ();
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fonts = null_hash ();
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form_xobjects = null_hash ();
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page_names = [];
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time = Cpdfstrftime.dummy;
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current_fontpack = ("Times-Roman", default_fontpack);
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current_fontpack_codepoints = null_hash ();
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font_size = 12.;
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num = 0}
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let resstack =
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ref [empty_res ()]
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let rescopy r =
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{r with
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images = Hashtbl.copy r.images;
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fonts = Hashtbl.copy r.fonts;
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extgstates = Hashtbl.copy r.extgstates;
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form_xobjects = Hashtbl.copy r.form_xobjects}
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let res () =
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try hd !resstack with _ -> error "graphics stack empty"
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let respush () =
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resstack := (rescopy (res ()))::!resstack
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let respop () =
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let n = (res ()).num in
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resstack := tl !resstack;
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(* not necessary, since names are isolated in the xobject, but it makes
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manual debugging of PDF files easier if we don't re-use numbers *)
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(res ()).num <- max n (res ()).num
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let fresh_name s =
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(res ()).num <- (res ()).num + 1;
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s ^ string_of_int (res ()).num
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(* At end of page, we keep things for which we have indirects - but ExtGStates
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aren't indirect, so they go. *)
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let reset_state () =
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Hashtbl.clear (res ()).extgstates(*;
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(res ()).page_names <- []*)
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let process_specials pdf endpage filename bates batespad num page s =
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let pairs =
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Cpdfaddtext.replace_pairs pdf endpage None filename bates batespad num page
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in
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Cpdfaddtext.process_text (res ()).time s pairs
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let font_widths f fontsize =
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match f with
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| Pdftext.StandardFont (sf, encoding) ->
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Array.init
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256
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(fun x ->
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fontsize
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*. float_of_int
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(Pdfstandard14.textwidth false encoding sf (string_of_char (char_of_int x)))
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/. 1000.)
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| Pdftext.SimpleFont {fontmetrics = Some m} ->
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Array.map (fun x -> fontsize *. x /. 1000. ) m
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| _ -> raise (Pdf.PDFError "Cpdfdraw: Unsupported font")
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let runs_of_utf8 ?(widthcache = null_hash ()) s =
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let identifier, fontpack = (res ()).current_fontpack in
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let codepoints = Pdftext.codepoints_of_utf8 s in
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let triples = option_map (Cpdfembed.get_char fontpack) codepoints in
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let collated = Cpdfembed.collate_runs triples in
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let font_widths fontnum font font_size =
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match Hashtbl.find_opt widthcache (fontnum, font_size) with
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| Some table -> table
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| None ->
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let widths = font_widths font font_size in
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Hashtbl.add widthcache (fontnum, font_size) widths;
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widths
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in
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let w =
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fold_left ( +. ) 0.
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(map
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(fun (charcode, fontnum, font) ->
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let widths = font_widths fontnum font (res ()).font_size in
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widths.(charcode))
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triples)
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in
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let output =
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flatten
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(map
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(fun l ->
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if l = [] then [] else
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let f, n = match l with (_, n, f)::_ -> f, n | _ -> assert false in
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let fontname = fst (Hashtbl.find (res ()).fonts (identifier, n)) in
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let charcodes = map (fun (c, _, _) -> char_of_int c) l in
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[Pdfops.Op_Tf (fontname, (res ()).font_size);
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Pdfops.Op_Tj (implode charcodes)])
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collated)
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in
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(output, w)
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let extgstate kind v =
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try Hashtbl.find (res ()).extgstates (kind, v) with
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Not_found ->
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let n = fresh_name "/G" in
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Hashtbl.replace (res ()).extgstates (kind, v) n;
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n
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let read_resource pdf n res =
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match Pdf.lookup_direct pdf n res with
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| Some (Pdf.Dictionary d) -> d
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| _ -> []
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let update_resources pdf old_resources =
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let gss_resources = map (fun ((kind, v), n) -> (n, Pdf.Dictionary [(kind, Pdf.Real v)])) (list_of_hashtbl (res ()).extgstates) in
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let select_resources t =
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option_map (fun (_, (n, o)) -> if mem n (res ()).page_names then Some (n, Pdf.Indirect o) else None) (list_of_hashtbl t)
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in
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let update = fold_right (fun (k, v) d -> add k v d) in
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let new_gss = update gss_resources (read_resource pdf "/ExtGState" old_resources) in
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let new_xobjects = update (select_resources (res ()).form_xobjects @ select_resources (res ()).images) (read_resource pdf "/XObject" old_resources) in
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let new_fonts = update (select_resources (res ()).fonts) (read_resource pdf "/Font" old_resources) in
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let add_if_non_empty dict name newdict =
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if newdict = Pdf.Dictionary [] then dict else
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Pdf.add_dict_entry dict name newdict
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in
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add_if_non_empty
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(add_if_non_empty
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(add_if_non_empty old_resources "/XObject" (Pdf.Dictionary new_xobjects))
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"/ExtGState"
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(Pdf.Dictionary new_gss))
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"/Font"
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(Pdf.Dictionary new_fonts)
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let mcidr = ref ~-1
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let mcid () = (incr mcidr; !mcidr)
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let mcpage = ref ~-1
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let standard_namespace = "http://iso.org/pdf/ssn"
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let pdf2_namespace = "http://iso.org/pdf2/ssn"
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(* namespace, object number pair. *)
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let namespaces = null_hash ()
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(* Add the object, add its number and this namespace to the hash. *)
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let add_namespace pdf s =
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if s = standard_namespace then () else
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match Hashtbl.find_opt namespaces s with
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| Some _ -> ()
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| None ->
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let objnum = Pdf.addobj pdf (Pdf.Dictionary [("/NS", Pdf.String s)]) in
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Hashtbl.add namespaces s objnum
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(* The structure data, as it is created, in flat form. Later on, this will be
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reconstructed into a structure tree. *)
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type structdata =
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| StDataBeginTree of string
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| StDataEndTree
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| StDataMCID of string * int
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| StDataPage of int
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| StDataNamespace of string
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| StEltInfo of string * Pdf.pdfobject
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| StEndEltInfo of string
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let structdata = ref []
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(* TODO: Tagging in XObjects, move tag state into res () etc. *)
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let rec remove_tfs prev = function
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| [] -> []
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| Pdfops.Op_Tf (f, _)::t when f = prev -> remove_tfs prev t
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| Pdfops.Op_Tf (f, s) as h::t -> h::remove_tfs f t
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| h::t -> h::remove_tfs prev t
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let rec merge_adjacent_tjs ops =
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let merge_tjs l =
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Pdfops.Op_Tj (String.concat "" (map (function Pdfops.Op_Tj s -> s | _ -> assert false) l))
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in
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match cleavewhile (function Pdfops.Op_Tj _ -> true | _ -> false) ops with
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| [], h::t -> h::merge_adjacent_tjs t
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| [], [] -> []
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| l, t -> merge_tjs l::merge_adjacent_tjs t
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let clean_up ops =
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merge_adjacent_tjs (remove_tfs "" ops)
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(* TODO: Use Uuseg for proper unicode segmentation. *)
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let format_paragraph indent j w s =
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let ss = String.split_on_char ' ' s in
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let widthcache = null_hash () in
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let rs_and_widths = ref (map (runs_of_utf8 ~widthcache) ss) in
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let space_runs, space_width = runs_of_utf8 ~widthcache " " in
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let remaining = ref w in
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let allops = ref [] in
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let ops = ref [] (*[Pdfops.Op_Comment "Format paragraph"]*) in
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let first = ref true in
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let firstloop = ref true in
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let justify ops =
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match j with
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| Left -> (if !first then [Pdfops.Op_Td (~-.indent, 0.)] else []) @ ops @ (if !first then [Pdfops.Op_Td (indent, 0.)] else [])
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| Right -> [Pdfops.Op_Td (~-.(!remaining), 0.)] @ ops @ [Pdfops.Op_Td (!remaining, 0.)]
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| Centre -> [Pdfops.Op_Td (~-.(!remaining) /. 2., 0.)] @ ops @ [Pdfops.Op_Td (!remaining /. 2., 0.)]
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in
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while !rs_and_widths <> [] do
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if !firstloop then (remaining -.= indent; clear firstloop);
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let word, word_width = hd !rs_and_widths in
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if !remaining = w then
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(* If current line empty, output word. *)
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begin
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ops := rev word @ !ops;
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remaining := !remaining -. word_width;
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rs_and_widths := tl !rs_and_widths
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end
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else if word_width +. space_width <= !remaining then
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(* If current line not empty, and space for space char and word, emit them. *)
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begin
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ops := rev space_runs @ !ops;
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ops := rev word @ !ops;
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remaining := !remaining -. word_width -. space_width;
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rs_and_widths := tl !rs_and_widths
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end
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else
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(* If current line not empty, and not enough space, emit newline. *)
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begin
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allops =| rev (Pdfops.Op_T'::justify !ops);
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clear first;
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ops := [];
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remaining := w;
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end;
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done;
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allops =| rev (Pdfops.Op_T'::justify !ops);
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clean_up (flatten (rev !allops))
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let current_eltinfo = null_hash ()
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let rec ops_of_drawop struct_tree dryrun pdf endpage filename bates batespad num page = function
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| Qq ops ->
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[Pdfops.Op_q] @ ops_of_drawops struct_tree dryrun pdf endpage filename bates batespad num page ops @ [Pdfops.Op_Q]
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| Matrix m -> [Pdfops.Op_cm m]
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| Rect (x, y, w, h) -> [Pdfops.Op_re (x, y, w, h)]
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| Bezier (a, b, c, d, e, f) -> [Pdfops.Op_c (a, b, c, d, e, f)]
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| Bezier23 (a, b, c, d) -> [Pdfops.Op_v (a, b, c, d)]
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| Bezier13 (a, b, c, d) -> [Pdfops.Op_y (a, b, c, d)]
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| To (x, y) -> [Pdfops.Op_m (x, y)]
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| Line (x, y) -> [Pdfops.Op_l (x, y)]
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| SetFill x ->
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begin match x with
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| RGB (r, g, b) -> [Op_rg (r, g, b)]
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| Grey g -> [Op_g g]
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| CYMK (c, y, m, k) -> [Op_k (c, y, m, k)]
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| NoCol -> []
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end
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| SetStroke x ->
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begin match x with
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| RGB (r, g, b) -> [Op_RG (r, g, b)]
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| Grey g -> [Op_G g]
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| CYMK (c, y, m, k) -> [Op_K (c, y, m, k)]
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| NoCol -> []
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end
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| ClosePath -> [Pdfops.Op_h]
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| Fill -> [Pdfops.Op_f]
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| FillEvenOdd -> [Pdfops.Op_f']
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| Stroke -> [Pdfops.Op_S]
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| FillStroke -> [Pdfops.Op_B]
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| FillStrokeEvenOdd -> [Pdfops.Op_B']
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| Clip -> [Pdfops.Op_W; Pdfops.Op_n]
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| ClipEvenOdd -> [Pdfops.Op_W'; Pdfops.Op_n]
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| SetLineThickness t -> [Pdfops.Op_w t]
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| SetLineCap c -> [Pdfops.Op_J c]
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| SetLineJoin j -> [Pdfops.Op_j j]
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| SetMiterLimit m -> [Pdfops.Op_M m]
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| SetDashPattern (x, y) -> [Pdfops.Op_d (x, y)]
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| FormXObject (a, b, c, d, n, ops) ->
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create_form_xobject struct_tree dryrun a b c d pdf endpage filename bates batespad num page n ops;
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[]
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| Use n ->
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let pdfname = try fst (Hashtbl.find (res ()).form_xobjects n) with _ -> error ("Form XObject not found: " ^ n) in
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(res ()).page_names <- pdfname::(res ()).page_names;
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[Pdfops.Op_Do pdfname]
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| Image s ->
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let m = if !do_auto_tag then mcid () else 0 in
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if not dryrun then structdata := StDataMCID ("/Figure", m)::!structdata;
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let pdfname = try fst (Hashtbl.find (res ()).images s) with _ -> error ("Image not found: " ^ s) in
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(res ()).page_names <- pdfname::(res ()).page_names;
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(if struct_tree && !do_auto_tag then [Pdfops.Op_BDC ("/Figure", Pdf.Dictionary ["/MCID", Pdf.Integer m])] else [])
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@ [Pdfops.Op_Do pdfname]
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@ (if struct_tree && !do_auto_tag then [Pdfops.Op_EMC] else [])
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| ImageXObject (s, obj) ->
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Hashtbl.replace (res ()).images s (fresh_name "/I", Pdf.addobj pdf obj);
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[]
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| NewPage -> Pdfe.log ("NewPage remaining in graphic stream"); assert false
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| Opacity v -> [Pdfops.Op_gs (extgstate "/ca" v)]
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| SOpacity v -> [Pdfops.Op_gs (extgstate "/CA" v)]
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| FontPack (identifier, cpdffont, codepoints) ->
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(*Printf.printf "FontPack op: |%s|\n%!" identifier;*)
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let fontpack =
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match Hashtbl.find !fontpacks identifier with
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| (fontpack, _) ->
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(*Printf.printf "Cpdfdraw FontPack op: using existing fontpack |%s|\n%!" identifier;*)
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fontpack
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| exception Not_found ->
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(*Printf.printf "Cpdfdraw FontPack op: storing new fontpack |%s|\n%!" identifier;*)
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let fontpack =
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match cpdffont with
|
|
| PreMadeFontPack fp ->
|
|
(*Printf.printf "it's a pre-made font pack\n%!";*)
|
|
fp
|
|
| EmbedInfo {fontfile; fontname; encoding} ->
|
|
let codepoints = map fst (list_of_hashtbl codepoints) in
|
|
(*Printf.printf "%i codepoints to embed\n%!" (length codepoints);*)
|
|
if codepoints = [] then default_fontpack else
|
|
Cpdfembed.embed_truetype pdf ~fontfile ~fontname ~codepoints ~encoding
|
|
| ExistingNamedFont ->
|
|
error "-draw does not support using an existing named font"
|
|
in
|
|
Hashtbl.replace !fontpacks identifier (fontpack, codepoints);
|
|
fontpack
|
|
in
|
|
let ns =
|
|
map2
|
|
(fun font n ->
|
|
try fst (Hashtbl.find (res ()).fonts (identifier, n)) with
|
|
Not_found ->
|
|
let o = if dryrun then 0 else Pdftext.write_font pdf font in
|
|
let name = fresh_name "/F" in
|
|
(*Printf.printf "Adding font %s as %s\n%!" identifier name;*)
|
|
Hashtbl.replace (res ()).fonts (identifier, n) (name, o);
|
|
name)
|
|
(fst fontpack)
|
|
(indx0 (fst fontpack))
|
|
in
|
|
(res ()).page_names <- ns @ (res ()).page_names;
|
|
[]
|
|
| Font (identifier, size) ->
|
|
(*Printf.printf "Cpdfdraw Font op: Changing to stored font %s\n%!" identifier;*)
|
|
let fontpack, codepoints = Hashtbl.find !fontpacks identifier in
|
|
(res ()).current_fontpack <- (identifier, fontpack);
|
|
if dryrun then (res ()).current_fontpack_codepoints <- codepoints;
|
|
(res ()).font_size <- size;
|
|
[]
|
|
| TextSection ops ->
|
|
[Pdfops.Op_BT] @ ops_of_drawops struct_tree dryrun pdf endpage filename bates batespad num page ops @ [Pdfops.Op_ET]
|
|
| Text s ->
|
|
if dryrun then iter (fun c -> Hashtbl.replace (res ()).current_fontpack_codepoints c ()) (Pdftext.codepoints_of_utf8 s);
|
|
let m = if !do_auto_tag then mcid () else 0 in
|
|
if not dryrun && !do_auto_tag then structdata := StDataMCID ("/P", m)::!structdata;
|
|
(if struct_tree && !do_auto_tag then [Pdfops.Op_BDC ("/P", Pdf.Dictionary ["/MCID", Pdf.Integer m])] else [])
|
|
@ fst (runs_of_utf8 s)
|
|
@ (if struct_tree && !do_auto_tag then [Pdfops.Op_EMC] else [])
|
|
| SpecialText s ->
|
|
let s = process_specials pdf endpage filename bates batespad num page s in
|
|
if dryrun then iter (fun c -> Hashtbl.replace (res ()).current_fontpack_codepoints c ()) (Pdftext.codepoints_of_utf8 s);
|
|
let m = if !do_auto_tag then mcid () else 0 in
|
|
if not dryrun && !do_auto_tag then structdata := StDataMCID ("/P", m)::!structdata;
|
|
(if struct_tree && !do_auto_tag then [Pdfops.Op_BDC ("/P", Pdf.Dictionary ["/MCID", Pdf.Integer m])] else [])
|
|
@ fst (runs_of_utf8 s)
|
|
@ (if struct_tree && !do_auto_tag then [Pdfops.Op_EMC] else [])
|
|
| Para (indent, j, w, s) ->
|
|
if dryrun then iter (iter (fun c -> Hashtbl.replace (res ()).current_fontpack_codepoints c ())) (map Pdftext.codepoints_of_utf8 s);
|
|
let first = ref true in
|
|
flatten
|
|
(map
|
|
(function para ->
|
|
let begintag =
|
|
let m = if !do_auto_tag then mcid () else 0 in
|
|
if not dryrun && !do_auto_tag then structdata := StDataMCID ("/P", m)::!structdata;
|
|
if struct_tree && !do_auto_tag then [Pdfops.Op_BDC ("/P", Pdf.Dictionary ["/MCID", Pdf.Integer m])] else []
|
|
in
|
|
let endtag =
|
|
if struct_tree && !do_auto_tag then [Pdfops.Op_EMC] else []
|
|
in
|
|
begintag
|
|
@ (if not !first && indent = None then [Pdfops.Op_T'] else (clear first; []))
|
|
@ format_paragraph (if indent <> None && not !first then unopt indent else 0.) j w para
|
|
@ endtag)
|
|
s)
|
|
| Leading f -> [Pdfops.Op_TL f]
|
|
| CharSpace f -> [Pdfops.Op_Tc f]
|
|
| WordSpace f -> [Pdfops.Op_Tw f]
|
|
| TextScale f -> [Pdfops.Op_Tz f]
|
|
| RenderMode i -> [Pdfops.Op_Tr i]
|
|
| Rise f -> [Pdfops.Op_Ts f]
|
|
| Newline -> [Pdfops.Op_T']
|
|
| Tag s ->
|
|
let m = mcid () in
|
|
if not dryrun then structdata := StDataMCID ("/" ^ s, m)::!structdata;
|
|
[Pdfops.Op_BDC ("/" ^ s, Pdf.Dictionary ["/MCID", Pdf.Integer m])]
|
|
| EndTag -> [Pdfops.Op_EMC]
|
|
| STag s -> if not dryrun then structdata =| StDataBeginTree ("/" ^ s); []
|
|
| EndSTag -> if not dryrun then structdata =| StDataEndTree; []
|
|
| BeginArtifact -> [Pdfops.Op_BMC "/BeginArtifact"]
|
|
| EndArtifact -> [Pdfops.Op_BMC "/EndArtifact"]
|
|
| Namespace s ->
|
|
if not dryrun then
|
|
begin
|
|
add_namespace pdf s;
|
|
structdata =| StDataNamespace s
|
|
end;
|
|
[]
|
|
| EltInfo (k, v) ->
|
|
if not dryrun then structdata =| StEltInfo (k, v);
|
|
[]
|
|
| EndEltInfo s ->
|
|
if not dryrun then structdata =| StEndEltInfo s;
|
|
[]
|
|
| AutoTag b ->
|
|
do_auto_tag := b;
|
|
[]
|
|
|
|
and ops_of_drawops struct_tree dryrun pdf endpage filename bates batespad num page drawops =
|
|
flatten (map (ops_of_drawop struct_tree dryrun pdf endpage filename bates batespad num page) drawops)
|
|
|
|
and create_form_xobject struct_tree dryrun a b c d pdf endpage filename bates batespad num page n ops =
|
|
respush ();
|
|
reset_state ();
|
|
let data =
|
|
Pdfio.bytes_of_string (Pdfops.string_of_ops (ops_of_drawops struct_tree dryrun pdf endpage filename bates batespad num page ops))
|
|
in
|
|
let obj =
|
|
Pdf.Stream
|
|
{contents =
|
|
(Pdf.Dictionary
|
|
[("/Length", Pdf.Integer (Pdfio.bytes_size data));
|
|
("/Subtype", Pdf.Name "/Form");
|
|
("/Resources", update_resources pdf (Pdf.Dictionary []));
|
|
("/BBox", Pdf.Array [Pdf.Real a; Pdf.Real b; Pdf.Real c; Pdf.Real d])
|
|
],
|
|
Pdf.Got data)}
|
|
in
|
|
respop ();
|
|
Hashtbl.replace (res ()).form_xobjects n (fresh_name "/X", (if dryrun then 0 else Pdf.addobj pdf obj))
|
|
|
|
let minimum_resource_number pdf range =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
let pages_in_range =
|
|
option_map2 (fun p n -> if mem n range then Some p else None) pages (indx pages) in
|
|
let number_of_name s =
|
|
match implode (rev (takewhile (function '0'..'9' -> true | _ -> false) (rev (explode s)))) with
|
|
| "" -> None
|
|
| s -> Some (int_of_string s)
|
|
in
|
|
let resource_names_page p =
|
|
let names n =
|
|
match Pdf.lookup_direct pdf n p.Pdfpage.resources with
|
|
| Some (Pdf.Dictionary d) -> map fst d
|
|
| _ -> []
|
|
in
|
|
names "/XObject" @ names "/ExtGState" @ names "/Font"
|
|
in
|
|
match
|
|
sort
|
|
(fun a b -> compare b a)
|
|
(option_map number_of_name (flatten (map resource_names_page pages_in_range)))
|
|
with
|
|
| [] -> 0
|
|
| n::_ -> n + 1
|
|
|
|
let rec contains_specials_drawop = function
|
|
| SpecialText _ -> true
|
|
| Qq l | TextSection l | FormXObject (_, _, _, _, _, l) -> contains_specials l
|
|
| _ -> false
|
|
|
|
and contains_specials l =
|
|
List.exists contains_specials_drawop l
|
|
|
|
let save_whole_stack () =
|
|
map (fun r -> rescopy r) !resstack
|
|
|
|
let restore_whole_stack r =
|
|
resstack := r
|
|
|
|
(* When no automatic artifacting, we still need to fix our backchannel manual artifacts. *)
|
|
let fixup_manual_artifacts =
|
|
map (function Pdfops.Op_BMC "/BeginArtifact" -> Pdfops.Op_BMC "/Artifact"
|
|
| Pdfops.Op_BMC "/EndArtifact" -> Pdfops.Op_EMC
|
|
| x -> x)
|
|
|
|
let draw_single ~struct_tree ~fast ~underneath ~filename ~bates ~batespad range pdf drawops =
|
|
(res ()).num <- max (res ()).num (minimum_resource_number pdf range);
|
|
let endpage = Pdfpage.endpage pdf in
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
let ops =
|
|
if contains_specials drawops
|
|
then None
|
|
else Some (ops_of_drawops struct_tree false pdf endpage filename bates batespad 0 (hd pages) drawops)
|
|
in
|
|
let ss =
|
|
map2
|
|
(fun n p ->
|
|
if mem n range
|
|
then
|
|
(match ops with
|
|
| Some x -> x
|
|
| None -> ops_of_drawops struct_tree false pdf endpage filename bates batespad n p drawops)
|
|
else [])
|
|
(ilist 1 endpage)
|
|
pages
|
|
in
|
|
let pages =
|
|
map3
|
|
(fun n p ops ->
|
|
if not (mem n range) then p else
|
|
let ops = if struct_tree && !do_add_artifacts then Cpdftype.add_artifacts ops else fixup_manual_artifacts ops in
|
|
let page = {p with Pdfpage.resources = update_resources pdf p.Pdfpage.resources} in
|
|
(if underneath then Pdfpage.prepend_operators else Pdfpage.postpend_operators) pdf ops ~fast page)
|
|
(ilist 1 endpage)
|
|
(Pdfpage.pages_of_pagetree pdf)
|
|
ss
|
|
in
|
|
Pdfpage.change_pages true pdf pages
|
|
|
|
(* Do a dry run of all the drawing to collect subset information. *)
|
|
let dryrun ~struct_tree ~filename ~bates ~batespad range pdf chunks =
|
|
let endpage = Pdfpage.endpage pdf in
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
let r = save_whole_stack () in
|
|
let saved_fontpacks = Hashtbl.copy !fontpacks in
|
|
let pagenum = ref (hd range) in
|
|
iter
|
|
(fun chunk ->
|
|
ignore (ops_of_drawops struct_tree true pdf endpage filename bates batespad !pagenum (hd pages) chunk);
|
|
match range with
|
|
| [x] when endpage > x -> pagenum := x + 1
|
|
| _ -> pagenum := endpage + 1)
|
|
chunks;
|
|
restore_whole_stack r;
|
|
fontpacks := saved_fontpacks
|
|
|
|
type st =
|
|
StMCID of int
|
|
| StItem of {kind : string; namespace : string; pageobjnum : int option; alt : (string * Pdf.pdfobject) list; children : st list}
|
|
|
|
(* Build a tree from the MCIDs and structure tree instructions gathered *)
|
|
let rec find_tree_contents a level = function
|
|
| [] -> error "not enough -end-stag"
|
|
| StDataBeginTree _ as h::t ->
|
|
find_tree_contents (h::a) (level + 1) t
|
|
| StDataEndTree::t ->
|
|
if level = 1 then (rev a, t) else find_tree_contents a (level - 1) t
|
|
| h::t -> find_tree_contents (h::a) level t
|
|
|
|
let mstdebug = ref false
|
|
|
|
let rec make_structure_tree pageobjnums (pn, ns, ei) pdf = function
|
|
| [] -> []
|
|
| StDataMCID (n, mcid)::t ->
|
|
if !mstdebug then Printf.printf "StDataMCID, type = %s pagenum = %i, pageobjnum = %i\n" n !pn (unopt (lookup !pn pageobjnums));
|
|
let item =
|
|
StItem {kind = n; namespace = !ns; alt = list_of_hashtbl ei; pageobjnum = lookup !pn pageobjnums; children = [StMCID mcid]}
|
|
in
|
|
item::make_structure_tree pageobjnums (pn, ns, ei) pdf t
|
|
| StDataPage n::t ->
|
|
if !mstdebug then Printf.printf "StDataPage %i\n" n;
|
|
pn := n;
|
|
make_structure_tree pageobjnums (pn, ns, ei) pdf t
|
|
| StDataNamespace s::t ->
|
|
if !mstdebug then Printf.printf "StDataNamespace %s\n" s;
|
|
ns := s;
|
|
make_structure_tree pageobjnums (pn, ns, ei) pdf t
|
|
| StEltInfo (k, v)::t ->
|
|
if !mstdebug then Printf.printf "StEltInfo %s, %s\n" k (Pdfwrite.string_of_pdf v);
|
|
Hashtbl.replace ei k v;
|
|
make_structure_tree pageobjnums (pn, ns, ei) pdf t
|
|
| StEndEltInfo s::t ->
|
|
if !mstdebug then Printf.printf "StEndEltInfo %s\n" s;
|
|
Hashtbl.remove ei s;
|
|
make_structure_tree pageobjnums (pn, ns, ei) pdf t
|
|
| StDataBeginTree s::t ->
|
|
if !mstdebug then Printf.printf "StBeginTree %s, namespace = %s\n" s !ns;
|
|
let tree_contents, rest = find_tree_contents [] 1 t in
|
|
let item =
|
|
let namespace = !ns in
|
|
let alt = list_of_hashtbl ei in
|
|
let children = make_structure_tree pageobjnums (pn, ns, ei) pdf tree_contents in
|
|
StItem {kind = s; namespace; alt; pageobjnum = None; children;}
|
|
in
|
|
item::make_structure_tree pageobjnums (pn, ns, ei) pdf rest
|
|
| StDataEndTree::t ->
|
|
error "Too many -end-tags"
|
|
|
|
let make_structure_tree pdf items =
|
|
let pageobjnums =
|
|
let objnums = Pdf.page_reference_numbers pdf in
|
|
combine (indx objnums) objnums
|
|
in
|
|
make_structure_tree pageobjnums (ref 0, ref standard_namespace, null_hash ()) pdf items
|
|
|
|
(* Write such a structure tree to a PDF. *)
|
|
let write_structure_tree pdf st =
|
|
let parentmap = ref [] in
|
|
let add_parentmap pon this_objnum =
|
|
match lookup pon !parentmap with
|
|
| None -> parentmap =| (pon, [this_objnum])
|
|
| Some objnums -> parentmap := add pon (this_objnum::objnums) !parentmap
|
|
in
|
|
let struct_tree_root = Pdf.addobj pdf Pdf.Null in
|
|
let rec mktree struct_tree_parent = function
|
|
| StItem {kind; namespace; pageobjnum; alt; children} ->
|
|
let this_objnum = Pdf.addobj pdf Pdf.Null in
|
|
begin match pageobjnum with
|
|
| Some p -> add_parentmap p this_objnum
|
|
| _ -> ()
|
|
end;
|
|
let alt = map (fun (k, v) -> ("/" ^ k, v)) alt in
|
|
let page =
|
|
match pageobjnum with
|
|
| Some i -> [("/Pg", Pdf.Indirect i)]
|
|
| None -> []
|
|
in
|
|
let namespace =
|
|
if namespace = standard_namespace then [] else
|
|
[("/NS", Pdf.Indirect (Hashtbl.find namespaces namespace))]
|
|
in
|
|
let this_obj =
|
|
Pdf.Dictionary
|
|
(alt
|
|
@ page
|
|
@ namespace
|
|
@ [("/S", Pdf.Name kind);
|
|
("/P", Pdf.Indirect struct_tree_parent);
|
|
("/K", Pdf.Array (map (mktree this_objnum) children))])
|
|
in
|
|
Pdf.addobj_given_num pdf (this_objnum, this_obj);
|
|
Pdf.Indirect this_objnum
|
|
| StMCID x ->
|
|
Pdf.Integer x
|
|
in
|
|
let items = map (mktree struct_tree_root) st in
|
|
iter
|
|
(fun (pon, _) ->
|
|
Pdf.addobj_given_num pdf (pon, Pdf.add_dict_entry (Pdf.lookup_obj pdf pon) "/StructParents" (Pdf.Integer pon)))
|
|
!parentmap;
|
|
let parentmap =
|
|
map (fun (pon, items) -> (string_of_int pon, Pdf.Array (map (fun x -> Pdf.Indirect x) (rev items)))) !parentmap
|
|
in
|
|
let st =
|
|
let namespaces =
|
|
match list_of_hashtbl namespaces with
|
|
| [] -> []
|
|
| ns -> [("/Namespaces", Pdf.Array (map (function (_, objnum) -> Pdf.Indirect objnum) ns))]
|
|
in
|
|
let rolemap =
|
|
match !rolemap with
|
|
| "" -> []
|
|
| s -> [("/RoleMap", Pdfread.parse_single_object ("<<" ^ s ^ ">>"))]
|
|
in
|
|
Pdf.Dictionary
|
|
(rolemap @ namespaces @
|
|
[("/Type", Pdf.Name "/StructTreeRoot");
|
|
("/ParentTree", Pdf.Indirect (Pdf.addobj pdf (Pdftree.build_name_tree true pdf parentmap)));
|
|
("/K", Pdf.Array items)])
|
|
in
|
|
Pdf.addobj_given_num pdf (struct_tree_root, st);
|
|
Pdf.replace_chain pdf ["/Root"; "/StructTreeRoot"] (Pdf.Indirect struct_tree_root)
|
|
|
|
let draw ~struct_tree ~fast ~underneath ~filename ~bates ~batespad range pdf drawops =
|
|
(*Printf.printf "%s\n" (string_of_drawops drawops);*)
|
|
if not struct_tree then clear do_add_artifacts;
|
|
resstack := [empty_res ()];
|
|
Hashtbl.clear !fontpacks;
|
|
(res ()).time <- Cpdfstrftime.current_time ();
|
|
let pdf = ref pdf in
|
|
let range = ref range in
|
|
(* Double up a trailing NewPage so it actually does something... *)
|
|
let drawops = match rev drawops with NewPage::t -> rev (NewPage::NewPage::t) | _ -> drawops in
|
|
let chunks = ref (split_around (eq NewPage) drawops) in
|
|
dryrun ~struct_tree ~filename ~bates ~batespad !range !pdf !chunks;
|
|
mcpage := 0;
|
|
while !chunks <> [] do
|
|
mcidr := -1;
|
|
mcpage += 1;
|
|
structdata =| StDataPage !mcpage;
|
|
reset_state ();
|
|
if hd !chunks <> [] then pdf := draw_single ~struct_tree ~fast ~underneath ~filename ~bates ~batespad !range !pdf (hd !chunks);
|
|
chunks := tl !chunks;
|
|
if !chunks <> [] then begin
|
|
(* If the range is just a single page, and there is a next page, move to it. Otherwise,
|
|
add a blank page at the end of the document. *)
|
|
let endpage = Pdfpage.endpage !pdf in
|
|
match !range with
|
|
| [x] when endpage > x -> range := [x + 1]
|
|
| _ ->
|
|
pdf := Cpdfpad.padafter [endpage] !pdf;
|
|
range := [endpage + 1]
|
|
end
|
|
done;
|
|
if struct_tree then write_structure_tree !pdf (make_structure_tree !pdf (rev !structdata));
|
|
!pdf
|