(* Superimpose text, page numbers etc. *) open Pdfutil open Cpdferror (* Keep a record of charcodes used for font subsetting. *) let used = null_hash () (* If we have used a TTF font, put its name and object number here. Then we know we put it there, and can avoid writing it anew across ANDS. *) let glob_pdfobjnum = null_hash () type color = Grey of float | RGB of float * float * float | CYMK of float * float * float * float (* Process UTF8 text to charcodes, given a font. *) let charcodes_of_utf8 font s = let extractor = Pdftext.charcode_extractor_of_font_real ~debug:false font in let codepoints = Pdftext.codepoints_of_utf8 s in let charcodes = option_map (fun codepoint -> match extractor codepoint with | Some cc -> Some cc | None -> Printf.eprintf "Warning: character not found in font for unicode codepoint 0x%X\n" codepoint; None) codepoints in implode (map char_of_int charcodes) let unicode_codepoint_of_pdfcode encoding_table glyphlist_table p = try hd (Hashtbl.find glyphlist_table (Hashtbl.find encoding_table p)) with Not_found -> 0 (* Get the width of some text in the given font *) let width_of_text font text = match font with | Pdftext.SimpleFont {Pdftext.fontmetrics = Some fontmetrics} -> begin try fold_left ( +. ) 0. (map (fun c -> fontmetrics.(int_of_char c)) (explode text)) with _ -> 0. end | _ -> 0. let colour_op = function | RGB (r, g, b) -> Pdfops.Op_rg (r, g, b) | Grey g -> Pdfops.Op_g g | CYMK (c, y, m, k) -> Pdfops.Op_k (c, y, m, k) let colour_op_stroke = function | RGB (r, g, b) -> Pdfops.Op_RG (r, g, b) | Grey g -> Pdfops.Op_G g | CYMK (c, y, m, k) -> Pdfops.Op_K (c, y, m, k) let ops fontname longest_w x y rotate hoffset voffset outline linewidth unique_fontname unique_extgstatename colour fontsize text = begin match Hashtbl.find used fontname with | exception Not_found -> let thisused = null_hash () in String.iter (fun x -> Hashtbl.replace thisused x ()) text; Hashtbl.add used fontname thisused | thisused -> String.iter (fun x -> Hashtbl.replace thisused x ()) text; end; [Pdfops.Op_q; Pdfops.Op_BMC "/CPDFSTAMP"; Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (x -. hoffset, y -. voffset); Pdftransform.Rotate ((0., 0.), rotate)]); Pdfops.Op_BT; ] @ (if outline then [Pdfops.Op_w linewidth; Pdfops.Op_Tr 1] else [Pdfops.Op_Tr 0]) @ [colour_op colour; colour_op_stroke colour] @ (match unique_extgstatename with None -> [] | Some n -> [Pdfops.Op_gs n]) @ [Pdfops.Op_Tf (unique_fontname, fontsize); Pdfops.Op_Tj text; Pdfops.Op_ET; Pdfops.Op_EMC; Pdfops.Op_Q] type justification = LeftJustify | CentreJustify | RightJustify (* Find the h-offset for justification based on the longest width, the current width, the justification and the position. *) let find_justification_offsets longest_w w position j = let open Cpdfposition in match j with | LeftJustify -> begin match position with | TopLeft _ | Left _ | PosLeft _ | BottomLeft _ -> 0. | Top _ | PosCentre _ | Bottom _ | Centre -> (longest_w -. w) /. 2. | TopRight _ | BottomRight _ | PosRight _ | Right _ -> longest_w -. w | Diagonal -> 0. | ReverseDiagonal -> 0. end | RightJustify -> begin match position with | TopLeft _ | Left _ | PosLeft _ | BottomLeft _ -> ~-.(longest_w -. w) | Top _ | PosCentre _ | Bottom _ | Centre -> ~-.((longest_w -. w) /. 2.) | TopRight _ | BottomRight _ | PosRight _ | Right _ -> 0. | Diagonal -> 0. | ReverseDiagonal -> 0. end | CentreJustify -> begin match position with | TopLeft _ | Left _ | PosLeft _ | BottomLeft _ -> ~-.((longest_w -. w) /. 2.) | Top _ | PosCentre _ | Bottom _ | Centre -> 0. | TopRight _ | BottomRight _ | PosRight _ | Right _ -> (longest_w -. w) /. 2. | Diagonal -> 0. | ReverseDiagonal -> 0. end (* Lex an integer from the table *) let extract_num header s = match Pdfgenlex.lex_string (Hashtbl.find header s) with [Pdfgenlex.LexInt i] -> Pdf.Integer i | [Pdfgenlex.LexReal f] -> Pdf.Real f | _ -> raise (Failure ("extract_num: " ^ s)) let extract_fontbbox header s = let num = function Pdfgenlex.LexInt i -> Pdf.Integer i | Pdfgenlex.LexReal f -> Pdf.Real f | _ -> raise (Failure "extract_fontbbox") in match Pdfgenlex.lex_string (Hashtbl.find header s) with [a; b; c; d] -> [num a; num b; num c; num d] | _ -> raise (Failure "extract_fontbbox") let remove_slash s = match explode s with '/'::x -> implode x | _ -> raise (Failure "remove_slash") let extract_widths chars_and_widths = let win_to_name = map (fun (x, y) -> (y, x)) Pdfglyphlist.name_to_win in map (fun x -> try let name = List.assoc x win_to_name in let width = List.assoc (remove_slash name) chars_and_widths in width with _ -> 0) (ilist 0 255) (* For finding the height for URL links, we try to find the Cap Height for the font. For now, this will only work for built-in fonts. We fall back to using the font size alone if we cannot get the cap height. *) let cap_height font fontname = match font with | Some (Pdftext.SimpleFont {fontdescriptor = Some {capheight}}) -> Some capheight | _ -> try let font = unopt (Pdftext.standard_font_of_name ("/" ^ fontname)) in let header, _, _, _ = Pdfstandard14.afm_data font in let capheight = try extract_num header "CapHeight" with _ -> Pdf.Integer 0 in Some (match capheight with Pdf.Integer i -> float_of_int i | Pdf.Real r -> r | _ -> 0.) with _ -> None let rec string_of_encoding = function | Pdftext.StandardEncoding -> "StandardEncoding" | Pdftext.MacRomanEncoding -> "MacRomanEncoding" | Pdftext.WinAnsiEncoding -> "WinAnsiEncoding" | _ -> error "unknown encoding" let make_font embed encoding fontname = let font = unopt (Pdftext.standard_font_of_name ("/" ^ fontname)) in let header, width_data, _, chars_and_widths = Pdfstandard14.afm_data font in let widths = extract_widths (list_of_hashtbl chars_and_widths) in let flags = Pdfstandard14.flags_of_standard_font font in let fontbbox = extract_fontbbox header "FontBBox" in let italicangle = extract_num header "ItalicAngle" in let ascent = try extract_num header "Ascender" with _ -> Pdf.Integer 0 in let descent = try extract_num header "Descender" with _ -> Pdf.Integer 0 in let capheight = try extract_num header "CapHeight" with _ -> Pdf.Integer 0 in let stemv = Pdfstandard14.stemv_of_standard_font font in let fontdescriptor = Pdf.Dictionary [("/Type", Pdf.Name "/FontDescriptor"); ("/FontName", Pdf.Name ("/" ^ fontname)); ("/Flags", Pdf.Integer flags); ("/FontBBox", Pdf.Array fontbbox); ("/ItalicAngle", italicangle); ("/Ascent", ascent); ("/Descent", descent); ("/CapHeight", capheight); ("/StemV", Pdf.Integer stemv)] in if embed then Pdf.Dictionary [("/Type", Pdf.Name "/Font"); ("/Subtype", Pdf.Name "/Type1"); ("/BaseFont", Pdf.Name ("/" ^ fontname)); ("/Encoding", Pdf.Name "/WinAnsiEncoding"); ("/FirstChar", Pdf.Integer 0); ("/LastChar", Pdf.Integer 255); ("/Widths", Pdf.Array (map (fun x -> Pdf.Integer x) widths)); ("/FontDescriptor", fontdescriptor)] else Pdf.Dictionary [("/Type", Pdf.Name "/Font"); ("/Subtype", Pdf.Name "/Type1"); ("/Encoding", Pdf.Name "/WinAnsiEncoding"); ("/BaseFont", Pdf.Name ("/" ^ fontname))] let extract_page_text only_fontsize pdf _ page = let text_extractor = ref None in let right_font_size = ref false in fold_left ( ^ ) "" (map (function | Pdfops.Op_Tf (fontname, fontsize) -> right_font_size := begin match only_fontsize with Some x -> x = fontsize | _ -> false end; let fontdict = match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with | None -> raise (Pdf.PDFError "Missing /Font in text extraction") | Some d -> match Pdf.lookup_direct pdf fontname d with | None -> raise (Pdf.PDFError "Missing font in text extraction") | Some d -> d in text_extractor := Some (Pdftext.text_extractor_of_font pdf fontdict); "" | Pdfops.Op_Tj text when !text_extractor <> None -> if not !right_font_size then "" else Pdftext.utf8_of_codepoints (Pdftext.codepoints_of_text (unopt !text_extractor) text) | Pdfops.Op_TJ (Pdf.Array objs) when !text_extractor <> None -> if not !right_font_size then "" else fold_left ( ^ ) "" (option_map (function | Pdf.String text -> Some (Pdftext.utf8_of_codepoints (Pdftext.codepoints_of_text (unopt !text_extractor) text)) | _ -> None) objs) | _ -> "") (Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content)) (* For each page, extract all the ops with text in them, and concatenate it all together *) let extract_text extract_text_font_size pdf range = fold_left (fun x y -> x ^ (if x <> "" && y <> "" then "\n" else "") ^ y) "" (Cpdfpage.map_pages (extract_page_text extract_text_font_size pdf) pdf range) let rec process_text time text m = match m with | [] -> Cpdfstrftime.strftime ~time text | (s, r)::t -> process_text time (string_replace_all_lazy s r text) t (* Find any %URL, sub in the text and return the new text together with a list of ordered (line num, URL, startpos, endpos) data. This will be used after any other %Specials have been processed, so that the positions do not change. *) (* text|url]abc -> text, url, abc *) let extract_url line = let text, rest = cleavewhile (neq '|') line in if rest = [] then error "bad URL syntax in text" else let url, rest = cleavewhile (neq ']') (tl rest) in if rest = [] then error "bad URL syntax in text" else (text, url, tl rest) (* multiple %URL[a|b] *) let get_urls_line line = let line = explode line in let urls = ref [] in let pos = ref 0 in let outline = ref [] in let rec loop = function | '%'::'U'::'R'::'L'::'['::t -> let text, url, rest = extract_url t in outline := rev text @ !outline; urls := (implode url, !pos, !pos + length text)::!urls; pos += length text; loop rest | h::t -> outline := h::!outline; pos += 1; loop t | [] -> () in loop line; (implode (rev !outline), rev !urls) (* Return page label at pdf page num, or page number in arabic if no label *) let pagelabel pdf num = Pdfpagelabels.pagelabeltext_of_pagenumber num (Pdfpagelabels.complete (Pdfpagelabels.read pdf)) let addtext time lines linewidth outline fast colour fontname encoding embed bates batespad fontsize (font : Pdftext.font option) fontpdfobj underneath position hoffset voffset text pages orientation cropbox opacity justification filename extract_text_font_size shift pdf = let endpage = Pdfpage.endpage pdf in let replace_pairs pdf filename bates batespad num page = [ "%PageDiv2", (fun () -> string_of_int ((num + 1) / 2)); "%Page", (fun () -> string_of_int num); "%Roman", (fun () -> roman_upper num); "%roman", (fun () -> roman_lower num); "%filename", (fun () -> filename); "%Label", (fun () -> pagelabel pdf num); "%EndPage", (fun () -> string_of_int endpage); "%EndLabel", (fun () -> pagelabel pdf endpage); "%ExtractedText", (fun () -> extract_page_text extract_text_font_size pdf num page); "%Bates", (fun () -> (let numstring = string_of_int (bates + num - 1) in match batespad with None -> numstring | Some w -> if String.length numstring >= w then numstring else implode (many '0' (w - String.length numstring)) ^ numstring))] in let shifts = Cpdfcoord.parse_coordinates pdf shift in let addtext_page num page = let shift_x, shift_y = List.nth shifts (num - 1) in let resources', unique_extgstatename = if opacity < 1.0 then let dict = match Pdf.lookup_direct pdf "/ExtGState" page.Pdfpage.resources with | Some d -> d | None -> Pdf.Dictionary [] in let unique_extgstatename = Pdf.unique_key "gs" dict in let dict' = Pdf.add_dict_entry dict unique_extgstatename (Pdf.Dictionary [("/ca", Pdf.Real opacity); ("/CA", Pdf.Real opacity)]) in Pdf.add_dict_entry page.Pdfpage.resources "/ExtGState" dict', Some unique_extgstatename else page.Pdfpage.resources, None in let fontdict = match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with | None -> Pdf.Dictionary [] | Some d -> d in let calc_textwidth text = match font with | Some (Pdftext.StandardFont (f, _)) -> let rawwidth = Pdfstandard14.textwidth false encoding f text in (float rawwidth *. fontsize) /. 1000. | Some font -> let rawwidth = width_of_text font text in (rawwidth *. fontsize) /. 1000. | None -> let font = match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with | Some fontdict -> begin match Pdf.lookup_direct pdf fontname fontdict with | Some font -> font | None -> (* For each item in the fontdict, follow its value and find the basename. If it matches, return that font *) let font = ref None in iter (fun (k, v) -> match Pdf.lookup_direct pdf "/BaseFont" v with | Some (Pdf.Name n) when n = fontname -> font := Some v | _ -> ()) (match fontdict with Pdf.Dictionary d -> d | _ -> []); match !font with Some f -> f | None -> failwith (Printf.sprintf "addtext: font %s not found" fontname) end | _ -> failwith "addtext: font not found for width" in let rawwidth = width_of_text (Pdftext.read_font pdf font) text in (rawwidth *. fontsize) /. 1000. in let unique_fontname = Pdf.unique_key "F" fontdict in let ops, urls, x, y, hoffset, voffset, text, joffset = let text = process_text time text (replace_pairs pdf filename bates batespad num page) in let text, urls = get_urls_line text in let expanded_lines = map (function text -> process_text time text (replace_pairs pdf filename bates batespad num page)) lines in let expanded_lines = (* process URLs for justification too *) map (fun line -> fst (get_urls_line line)) expanded_lines in let textwidth = calc_textwidth text and allwidths = map calc_textwidth expanded_lines in let longest_w = last (sort compare allwidths) in let joffset = find_justification_offsets longest_w textwidth position justification in let mediabox = if cropbox then match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with | Some pdfobject -> Pdf.parse_rectangle pdf (Pdf.direct pdf pdfobject) | None -> Pdf.parse_rectangle pdf page.Pdfpage.mediabox else Pdf.parse_rectangle pdf page.Pdfpage.mediabox in let x, y, rotate = Cpdfposition.calculate_position false textwidth mediabox position in let hoffset, voffset = if position = Diagonal || position = ReverseDiagonal then -. (cos ((pi /. 2.) -. rotate) *. voffset), sin ((pi /. 2.) -. rotate) *. voffset else hoffset, voffset in match font with | Some f -> ops fontname longest_w (x +. shift_x) (y +. shift_y) rotate (hoffset +. joffset) voffset outline linewidth unique_fontname unique_extgstatename colour fontsize text, urls, x, y, hoffset, voffset, text, joffset | None -> ops fontname longest_w (x +. shift_x) (y +. shift_y) rotate (hoffset +. joffset) voffset outline linewidth fontname None colour fontsize text, urls, x, y, hoffset, voffset, text, joffset in let newresources = match font with | Some (Pdftext.StandardFont _) -> let newfontdict = Pdf.add_dict_entry fontdict unique_fontname (make_font embed encoding fontname) in Pdf.add_dict_entry resources' "/Font" newfontdict | Some f -> let newfontdict = Pdf.add_dict_entry fontdict unique_fontname fontpdfobj in Pdf.add_dict_entry resources' "/Font" newfontdict | None -> page.Pdfpage.resources in (* Build annotations from URL data (get_urls and some sense of metrics) *) let annot (minx, miny, maxx, maxy) url = Pdf.Dictionary [("/Subtype", Pdf.Name "/Link"); ("/Rect", Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy]); ("/BS", Pdf.Dictionary [("/W", Pdf.Integer 0)]); ("/A", Pdf.Dictionary [("/URI", Pdf.String url); ("/Type", Pdf.Name "/Action"); ("/S", Pdf.Name "/URI")])] in let annots = let annot_coord text pos = let before = take (explode text) pos in calc_textwidth (implode before) in map (fun (url, s, e) -> let sx = annot_coord text s in let ex = annot_coord text e in let x, y = x -. hoffset -. joffset, y -. voffset in let height = match cap_height font fontname with | Some c -> (c *. fontsize) /. 1000. | None -> fontsize in Pdf.Indirect (Pdf.addobj pdf (annot (x +. sx, y, x +. ex, y +. height) url))) urls in let newrest = if annots = [] then page.Pdfpage.rest else let existing = match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with | Some (Pdf.Array a) -> a | _ -> [] in Pdf.add_dict_entry page.Pdfpage.rest "/Annots" (Pdf.Array (annots @ existing)) in let page = {page with Pdfpage.resources = newresources; Pdfpage.rest = newrest} in if underneath then Pdfpage.prepend_operators pdf ops ~fast:fast page else Pdfpage.postpend_operators pdf ops ~fast:fast page in Cpdfpage.process_pages (Cpdfutil.ppstub addtext_page) pdf pages (* Prev is a list of lists of characters *) let split_at_newline t = let rec split_at_newline_inner prev = function | [] -> rev (map implode (map rev prev)) | '\\'::'\\'::'n'::t -> split_at_newline_inner (('n'::'\\'::'\\'::hd prev)::tl prev) t | '\\'::'n'::t -> split_at_newline_inner ([]::prev) t | h::t -> split_at_newline_inner ((h::hd prev)::tl prev) t in split_at_newline_inner [[]] (explode t) let rec unescape_chars prev = function | [] -> rev prev | '\\'::('0'..'7' as a)::('0'..'7' as b)::('0'..'7' as c)::t -> let chr = char_of_int (int_of_string ("0o" ^ implode [a;b;c])) in unescape_chars (chr::prev) t | '\\'::'\\'::t -> unescape_chars ('\\'::prev) t | '\\'::c::t when c <> 'n' -> unescape_chars (c::prev) t | h::t -> unescape_chars (h::prev) t let unescape_string s = implode (unescape_chars [] (explode s)) let addtexts ?embedinfo linewidth outline fast fontname (font : Pdftext.font option) embed bates batespad colour position linespacing fontsize underneath text pages orientation cropbox opacity justification midline topline filename extract_text_font_size shift ?(raw=false) pdf = let time = Cpdfstrftime.current_time () in if pages = [] then error "addtexts: empty page range" else let realfontname = ref fontname in let fontpdfobj = match font with | Some (StandardFont (f, encoding)) -> make_font embed encoding (Pdftext.string_of_standard_font f) | Some f -> begin match Hashtbl.find glob_pdfobjnum fontname with | exception Not_found -> let i = Pdftext.write_font pdf f in Hashtbl.add glob_pdfobjnum fontname i; Pdf.Indirect i | i -> Pdf.Indirect i end | None -> let firstpage = List.nth (Pdfpage.pages_of_pagetree pdf) (hd pages - 1) in match Pdf.lookup_direct pdf "/Font" firstpage.Pdfpage.resources with | Some fontdict -> begin match Pdf.lookup_direct pdf fontname fontdict with | Some font -> font | _ -> (* For each item in the fontdict, follow its value and find the basename. If it matches, return that font *) let font = ref None in iter (fun (k, v) -> match Pdf.lookup_direct pdf "/BaseFont" v with | Some (Pdf.Name n) when n = fontname -> font := Some v; realfontname := k | _ -> ()) (match fontdict with Pdf.Dictionary d -> d | _ -> []); match !font with Some f -> f | None -> failwith (Printf.sprintf "addtext: font %s not found" fontname) end | _ -> failwith "addtext: font dictionary not present" in (* 19th May 2022. Reversed the phase order (split first, then get charcodes. This allows \n in custom fonts. *) let lines = map unescape_string (split_at_newline text) in let lines = map (fun text -> if raw then text else charcodes_of_utf8 (Pdftext.read_font pdf fontpdfobj) text) lines in let pdf = ref pdf in let voffset = let open Cpdfposition in match position with | Bottom _ | BottomLeft _ | BottomRight _ -> ref (0. -. (linespacing *. fontsize *. (float (length lines) -. 1.))) | Left _ | Right _ -> (* Vertically align *) ref (0. -. (linespacing *. ((fontsize *. (float (length lines) -. 1.)) /. 2.))) | Diagonal | ReverseDiagonal -> (* Change so that the whole paragraph sits on the centre... *) ref (0. -. ((linespacing *. fontsize *. (float (length lines) -. 1.)) /. 2.)) | _ -> ref 0. in if midline then begin match font with | Some (Pdftext.StandardFont (font, _)) -> let baseline_adjustment = (fontsize *. float (Pdfstandard14.baseline_adjustment font)) /. 1000. in voffset := !voffset +. baseline_adjustment | Some (Pdftext.SimpleFont {fontdescriptor = Some {capheight}}) -> voffset := !voffset +. capheight /. 2. | _ -> Printf.eprintf "Unable to find midline adjustment in this font\n" end else if topline then begin match font with | Some (Pdftext.StandardFont (font, _)) -> let baseline_adjustment = (fontsize *. float (Pdfstandard14.baseline_adjustment font) *. 2.0) /. 1000. in voffset := !voffset +. baseline_adjustment | Some (Pdftext.SimpleFont {fontdescriptor = Some {capheight}}) -> voffset := !voffset +. capheight | _ -> Printf.eprintf "Unable to find midline adjustment in this font\n" end; let encoding = match font with | Some (Pdftext.StandardFont (_, e)) -> e | Some (Pdftext.SimpleFont {encoding}) -> encoding | _ -> Pdftext.WinAnsiEncoding in iter (fun line -> let voff, hoff = !voffset, 0. in pdf := addtext time lines linewidth outline fast colour !realfontname encoding embed bates batespad fontsize font fontpdfobj underneath position hoff voff line pages orientation cropbox opacity justification filename extract_text_font_size shift !pdf; voffset := !voffset +. (linespacing *. fontsize)) lines; begin match embedinfo with | None -> () | Some (_, fontfile, fontname, encoding) -> let charcodes = match Hashtbl.find used fontname with | exception Not_found -> [] | thisused -> map fst (list_of_hashtbl thisused) in let encoding_table = Pdftext.table_of_encoding encoding in let glyphlist_table = Pdfglyphlist.glyph_hashes () in let codepoints = map (fun c -> unicode_codepoint_of_pdfcode encoding_table glyphlist_table (int_of_char c)) charcodes in let objnum = match fontpdfobj with Pdf.Indirect i -> i | _ -> failwith "bad fontpdfobj" in let font = Cpdfembed.embed_truetype !pdf ~fontfile ~fontname ~codepoints ~encoding in ignore (Pdftext.write_font ~objnum !pdf font) end; !pdf let removetext range pdf = (* Could fail on nesting, or other marked content inside our marked content.*) let rec remove_until_last_EMC level = function | [] -> [] | Pdfops.Op_BMC "/CPDFSTAMP"::more -> remove_until_last_EMC (level + 1) more | Pdfops.Op_EMC::more -> if level = 1 then more else remove_until_last_EMC (level - 1) more | _::more -> remove_until_last_EMC level more in let rec remove_stamps prev = function | [] -> rev prev | Pdfops.Op_BMC "/CPDFSTAMP"::more -> let rest = remove_until_last_EMC 1 more in remove_stamps prev rest | h::t -> remove_stamps (h::prev) t in let removetext_page _ page = {page with Pdfpage.content = let ops = Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content in [Pdfops.stream_of_ops (remove_stamps [] ops)]} in Cpdfpage.process_pages (Cpdfutil.ppstub removetext_page) pdf range let addrectangle fast (w, h) colour outline linewidth opacity position relative_to_cropbox underneath range pdf = let addrectangle_page _ page = let resources', unique_extgstatename = if opacity < 1.0 then let dict = match Pdf.lookup_direct pdf "/ExtGState" page.Pdfpage.resources with | Some d -> d | None -> Pdf.Dictionary [] in let unique_extgstatename = Pdf.unique_key "gs" dict in let dict' = Pdf.add_dict_entry dict unique_extgstatename (Pdf.Dictionary [("/ca", Pdf.Real opacity); ("/CA", Pdf.Real opacity)]) in Pdf.add_dict_entry page.Pdfpage.resources "/ExtGState" dict', Some unique_extgstatename else page.Pdfpage.resources, None in let mediabox = if relative_to_cropbox then match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with | Some pdfobject -> Pdf.parse_rectangle pdf (Pdf.direct pdf pdfobject) | None -> Pdf.parse_rectangle pdf page.Pdfpage.mediabox else Pdf.parse_rectangle pdf page.Pdfpage.mediabox in let x, y, _ = Cpdfposition.calculate_position false w mediabox position in let x, y = match position with Cpdfposition.Top _ | Cpdfposition.TopLeft _ | Cpdfposition.TopRight _ -> (x, y -. h) | Cpdfposition.Centre | Cpdfposition.PosCentre _ -> (x, y -. (h /. 2.)) | _ -> (x, y) in let ops = [ Pdfops.Op_q; Pdfops.Op_BMC "/CPDFSTAMP"; colour_op colour; colour_op_stroke colour; ] @ (if outline then [Pdfops.Op_w linewidth] else []) @ (match unique_extgstatename with None -> [] | Some n -> [Pdfops.Op_gs n]) @ [ Pdfops.Op_re (x, y, w, h); (if outline then Pdfops.Op_s else Pdfops.Op_f); Pdfops.Op_EMC; Pdfops.Op_Q ] in let page = {page with Pdfpage.resources = resources'} in if underneath then Pdfpage.prepend_operators pdf ops ~fast:fast page else Pdfpage.postpend_operators pdf ops ~fast:fast page in Cpdfpage.process_pages (Cpdfutil.ppstub addrectangle_page) pdf range let rec remove_all_text_ops pdf resources content = let is_textop = function Pdfops.Op_Tj _ | Pdfops.Op_' _ | Pdfops.Op_'' _ | Pdfops.Op_TJ _ -> true | _ -> false in let content' = let ops = Pdfops.parse_operators pdf resources content in Pdfops.stream_of_ops (option_map (function x -> if is_textop x then None else Some x) ops) in [content'] let remove_all_text_page pdf p = let resources = p.Pdfpage.resources in let content = p.Pdfpage.content in Cpdfutil.process_xobjects pdf p remove_all_text_ops; {p with Pdfpage.content = remove_all_text_ops pdf resources content}, pdf let remove_all_text range pdf = let pages = Pdfpage.pages_of_pagetree pdf in let pagenums = indx pages in let pdf = ref pdf in let pages' = ref [] in iter2 (fun p pagenum -> let p', pdf' = if mem pagenum range then remove_all_text_page !pdf p else p, !pdf in pdf := pdf'; pages' =| p') pages pagenums; Pdfpage.change_pages true !pdf (rev !pages')