437 lines
16 KiB
OCaml
437 lines
16 KiB
OCaml
open Pdfutil
|
|
open Cpdferror
|
|
|
|
(* FIXME Use hashtbl.replace everywhere? *)
|
|
|
|
type colspec =
|
|
NoCol
|
|
| RGB of float * float * float
|
|
| Grey of float
|
|
| CYMK of float * float * float * float
|
|
|
|
type drawops =
|
|
| Rect of float * float * float * float
|
|
| Bezier of float * float * float * float * float * float
|
|
| Bezier23 of float * float * float * float
|
|
| Bezier13 of float * float * float * float
|
|
| To of float * float
|
|
| Line of float * float
|
|
| ClosePath
|
|
| SetFill of colspec
|
|
| SetStroke of colspec
|
|
| SetLineThickness of float
|
|
| SetLineCap of int
|
|
| SetLineJoin of int
|
|
| SetMiterLimit of float
|
|
| SetDashPattern of float list * float
|
|
| Matrix of Pdftransform.transform_matrix
|
|
| Qq of drawops list
|
|
| Fill
|
|
| FillEvenOdd
|
|
| Stroke
|
|
| FillStroke
|
|
| FillStrokeEvenOdd
|
|
| Clip
|
|
| ClipEvenOdd
|
|
| FormXObject of float * float * float * float * string * drawops list
|
|
| Use of string
|
|
| ImageXObject of string * Pdf.pdfobject
|
|
| Image of string
|
|
| NewPage
|
|
| Opacity of float
|
|
| SOpacity of float
|
|
| FontPack of string * Cpdfembed.cpdffont * (int, unit) Hashtbl.t
|
|
| Font of string * float
|
|
| TextSection of drawops list
|
|
| Text of string
|
|
| SpecialText of string
|
|
| Newline
|
|
| Leading of float
|
|
| CharSpace of float
|
|
| WordSpace of float
|
|
| TextScale of float
|
|
| RenderMode of int
|
|
| Rise of float
|
|
|
|
let rec string_of_drawop = function
|
|
| Qq o -> "Qq (" ^ string_of_drawops o ^ ")"
|
|
| FormXObject (_, _, _, _, _, o) -> "FormXObject (" ^ string_of_drawops o ^ ")"
|
|
| TextSection o -> "TextSection (" ^ string_of_drawops o ^ ")"
|
|
| Rect _ -> "Rect" | Bezier _ -> "Bezier" | Bezier23 _ -> "Bezier23"
|
|
| Bezier13 _ -> "Bezier13" | To _ -> "To" | Line _ -> "Line"
|
|
| ClosePath -> "ClosePath" | SetFill _ -> "SetFill" | SetStroke _ -> "SetStroke"
|
|
| SetLineThickness _ -> "SetLineThickness" | SetLineCap _ -> "SetLineCap"
|
|
| SetLineJoin _ -> "SetLineJoin" | SetMiterLimit _ -> "SetMiterLimit"
|
|
| SetDashPattern _ -> "SetDashPattern" | Matrix _ -> "SetMatrix"
|
|
| Fill -> "Fill" | FillEvenOdd -> "FillEvenOdd" | Stroke -> "Stroke"
|
|
| FillStroke -> "FillStroke" | FillStrokeEvenOdd -> "FillStrokeEvenOdd"
|
|
| Clip -> "Clip" | ClipEvenOdd -> "ClipEvenOdd" | Use _ -> "Use"
|
|
| ImageXObject _ -> "ImageXObject" | Image _ -> "Image" | NewPage -> "NewPage"
|
|
| Opacity _ -> "Opacity" | SOpacity _ -> "SOpacity" | FontPack (n, _, _) -> "FontPack " ^ n ^ " "
|
|
| Font (f, _) -> "Font " ^ f ^ " " | Text _ -> "Text" | SpecialText _ -> "SpecialText"
|
|
| Newline -> "Newline" | Leading _ -> "Leading" | CharSpace _ -> "CharSpace"
|
|
| WordSpace _ -> "WordSpace" | TextScale _ -> "TextScale"
|
|
| RenderMode _ -> "RenderMode" | Rise _ -> "Rise"
|
|
|
|
and string_of_drawops l =
|
|
fold_left (fun x y -> x ^ " " ^ y) "" (map string_of_drawop l)
|
|
|
|
(* Per page / xobject resources *)
|
|
type res =
|
|
{images : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
|
|
extgstates : ((string * float), string) Hashtbl.t; (* (kind, value), name *)
|
|
fonts : (Pdftext.font, (string * int)) Hashtbl.t; (* (font, (objnum, pdf name)) *)
|
|
form_xobjects : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
|
|
mutable page_names : string list;
|
|
mutable time : Cpdfstrftime.t;
|
|
mutable current_fontpack : Cpdfembed.t;
|
|
mutable current_fontpack_codepoints : (int, unit) Hashtbl.t;
|
|
mutable font_size : float;
|
|
mutable num : int}
|
|
|
|
let default_fontpack =
|
|
Cpdfembed.fontpack_of_standardfont
|
|
(Pdftext.StandardFont (Pdftext.TimesRoman, Pdftext.WinAnsiEncoding))
|
|
|
|
let fontpacks = null_hash ()
|
|
|
|
let empty_res () =
|
|
{images = null_hash ();
|
|
extgstates = null_hash ();
|
|
fonts = null_hash ();
|
|
form_xobjects = null_hash ();
|
|
page_names = [];
|
|
time = Cpdfstrftime.dummy;
|
|
current_fontpack = default_fontpack;
|
|
current_fontpack_codepoints = null_hash ();
|
|
font_size = 12.;
|
|
num = 0}
|
|
|
|
let resstack =
|
|
ref [empty_res ()]
|
|
|
|
let rescopy r =
|
|
{r with
|
|
images = Hashtbl.copy r.images;
|
|
fonts = Hashtbl.copy r.fonts;
|
|
extgstates = Hashtbl.copy r.extgstates;
|
|
form_xobjects = Hashtbl.copy r.form_xobjects}
|
|
|
|
let res () =
|
|
try hd !resstack with _ -> error "graphics stack empty"
|
|
|
|
let respush () =
|
|
resstack := (rescopy (res ()))::!resstack
|
|
|
|
let respop () =
|
|
let n = (res ()).num in
|
|
resstack := tl !resstack;
|
|
(* not necessary, since names are isolated in the xobject, but it makes
|
|
manual debugging of PDF files easier if we don't re-use numbers *)
|
|
(res ()).num <- max n (res ()).num
|
|
|
|
let fresh_name s =
|
|
(res ()).num <- (res ()).num + 1;
|
|
s ^ string_of_int (res ()).num
|
|
|
|
(* At end of page, we keep things for which we have indirects - but ExtGStates
|
|
aren't indirect, so they go. *)
|
|
let reset_state () =
|
|
Hashtbl.clear (res ()).extgstates;
|
|
(res ()).page_names <- []
|
|
|
|
let process_specials pdf endpage filename bates batespad num page s =
|
|
let pairs =
|
|
Cpdfaddtext.replace_pairs pdf endpage None filename bates batespad num page
|
|
in
|
|
Cpdfaddtext.process_text (res ()).time s pairs
|
|
|
|
let runs_of_utf8 s =
|
|
let fontpack = (res ()).current_fontpack in
|
|
let codepoints = Pdftext.codepoints_of_utf8 s in
|
|
(*Printf.printf "%i codepoints\n" (length codepoints);*)
|
|
let triples = option_map (Cpdfembed.get_char fontpack) codepoints in
|
|
(*Printf.printf "%i triples\n" (length triples);*)
|
|
let collated = Cpdfembed.collate_runs triples in
|
|
(*Printf.printf "Collated of length %i\n" (length collated);*)
|
|
flatten
|
|
(map
|
|
(fun l ->
|
|
if l = [] then [] else
|
|
let f = match l with (_, _, f)::_ -> f | _ -> assert false in
|
|
let fontname = fst (Hashtbl.find (res ()).fonts f) in
|
|
let charcodes = map (fun (c, _, _) -> char_of_int c) l in
|
|
[Pdfops.Op_Tf (fontname, (res ()).font_size);
|
|
Pdfops.Op_Tj (implode charcodes)])
|
|
collated)
|
|
|
|
let extgstate kind v =
|
|
try Hashtbl.find (res ()).extgstates (kind, v) with
|
|
Not_found ->
|
|
let n = fresh_name "/G" in
|
|
Hashtbl.add (res ()).extgstates (kind, v) n;
|
|
n
|
|
|
|
let read_resource pdf n res =
|
|
match Pdf.lookup_direct pdf n res with
|
|
| Some (Pdf.Dictionary d) -> d
|
|
| _ -> []
|
|
|
|
let update_resources pdf old_resources =
|
|
let gss_resources = map (fun ((kind, v), n) -> (n, Pdf.Dictionary [(kind, Pdf.Real v)])) (list_of_hashtbl (res ()).extgstates) in
|
|
let select_resources t =
|
|
option_map (fun (_, (n, o)) -> if mem n (res ()).page_names then Some (n, Pdf.Indirect o) else None) (list_of_hashtbl t)
|
|
in
|
|
let update = fold_right (fun (k, v) d -> add k v d) in
|
|
let new_gss = update gss_resources (read_resource pdf "/ExtGState" old_resources) in
|
|
let new_xobjects = update (select_resources (res ()).form_xobjects @ select_resources (res ()).images) (read_resource pdf "/XObject" old_resources) in
|
|
let new_fonts = update (select_resources (res ()).fonts) (read_resource pdf "/Font" old_resources) in
|
|
let add_if_non_empty dict name newdict =
|
|
if newdict = Pdf.Dictionary [] then dict else
|
|
Pdf.add_dict_entry dict name newdict
|
|
in
|
|
add_if_non_empty
|
|
(add_if_non_empty
|
|
(add_if_non_empty old_resources "/XObject" (Pdf.Dictionary new_xobjects))
|
|
"/ExtGState"
|
|
(Pdf.Dictionary new_gss))
|
|
"/Font"
|
|
(Pdf.Dictionary new_fonts)
|
|
|
|
let rec ops_of_drawop dryrun pdf endpage filename bates batespad num page = function
|
|
| Qq ops ->
|
|
[Pdfops.Op_q] @ ops_of_drawops dryrun pdf endpage filename bates batespad num page ops @ [Pdfops.Op_Q]
|
|
| Matrix m -> [Pdfops.Op_cm m]
|
|
| Rect (x, y, w, h) -> [Pdfops.Op_re (x, y, w, h)]
|
|
| Bezier (a, b, c, d, e, f) -> [Pdfops.Op_c (a, b, c, d, e, f)]
|
|
| Bezier23 (a, b, c, d) -> [Pdfops.Op_v (a, b, c, d)]
|
|
| Bezier13 (a, b, c, d) -> [Pdfops.Op_y (a, b, c, d)]
|
|
| To (x, y) -> [Pdfops.Op_m (x, y)]
|
|
| Line (x, y) -> [Pdfops.Op_l (x, y)]
|
|
| SetFill x ->
|
|
begin match x with
|
|
| RGB (r, g, b) -> [Op_rg (r, g, b)]
|
|
| Grey g -> [Op_g g]
|
|
| CYMK (c, y, m, k) -> [Op_k (c, y, m, k)]
|
|
| NoCol -> []
|
|
end
|
|
| SetStroke x ->
|
|
begin match x with
|
|
| RGB (r, g, b) -> [Op_RG (r, g, b)]
|
|
| Grey g -> [Op_G g]
|
|
| CYMK (c, y, m, k) -> [Op_K (c, y, m, k)]
|
|
| NoCol -> []
|
|
end
|
|
| ClosePath -> [Pdfops.Op_h]
|
|
| Fill -> [Pdfops.Op_f]
|
|
| FillEvenOdd -> [Pdfops.Op_f']
|
|
| Stroke -> [Pdfops.Op_S]
|
|
| FillStroke -> [Pdfops.Op_B]
|
|
| FillStrokeEvenOdd -> [Pdfops.Op_B']
|
|
| Clip -> [Pdfops.Op_W; Pdfops.Op_n]
|
|
| ClipEvenOdd -> [Pdfops.Op_W'; Pdfops.Op_n]
|
|
| SetLineThickness t -> [Pdfops.Op_w t]
|
|
| SetLineCap c -> [Pdfops.Op_J c]
|
|
| SetLineJoin j -> [Pdfops.Op_j j]
|
|
| SetMiterLimit m -> [Pdfops.Op_M m]
|
|
| SetDashPattern (x, y) -> [Pdfops.Op_d (x, y)]
|
|
| FormXObject (a, b, c, d, n, ops) ->
|
|
create_form_xobject dryrun a b c d pdf endpage filename bates batespad num page n ops;
|
|
[]
|
|
| Use n ->
|
|
let pdfname = try fst (Hashtbl.find (res ()).form_xobjects n) with _ -> error ("Form XObject not found: " ^ n) in
|
|
(res ()).page_names <- pdfname::(res ()).page_names;
|
|
[Pdfops.Op_Do pdfname]
|
|
| Image s ->
|
|
let pdfname = try fst (Hashtbl.find (res ()).images s) with _ -> error ("Image not found: " ^ s) in
|
|
(res ()).page_names <- pdfname::(res ()).page_names;
|
|
[Pdfops.Op_Do pdfname]
|
|
| ImageXObject (s, obj) ->
|
|
Hashtbl.add (res ()).images s (fresh_name "/I", Pdf.addobj pdf obj);
|
|
[]
|
|
| NewPage -> Pdfe.log ("NewPage remaining in graphic stream"); assert false
|
|
| Opacity v -> [Pdfops.Op_gs (extgstate "/ca" v)]
|
|
| SOpacity v -> [Pdfops.Op_gs (extgstate "/CA" v)]
|
|
| FontPack (identifier, cpdffont, codepoints) ->
|
|
begin match Hashtbl.find fontpacks identifier with
|
|
| fontpack -> ()
|
|
(*Printf.printf "Cpdfdraw: using existing fontpack %s\n" identifier*)
|
|
| exception Not_found ->
|
|
(*Printf.printf "Cpdfdraw: storing new fontpack %s\n" identifier;*)
|
|
let fontpack =
|
|
match cpdffont with
|
|
| PreMadeFontPack fp -> fp
|
|
| EmbedInfo {fontfile; fontname; encoding} ->
|
|
let codepoints = map fst (list_of_hashtbl codepoints) in
|
|
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.add fontpacks identifier (fontpack, codepoints);
|
|
let ns =
|
|
map
|
|
(fun font ->
|
|
try fst (Hashtbl.find (res ()).fonts font) with
|
|
Not_found ->
|
|
let o = if dryrun then 0 else Pdftext.write_font pdf font in
|
|
let n = fresh_name "/F" in
|
|
Hashtbl.add (res ()).fonts font (n, o);
|
|
n)
|
|
(fst fontpack)
|
|
in
|
|
(res ()).page_names <- ns @ (res ()).page_names
|
|
end;
|
|
[]
|
|
| Font (identifier, size) ->
|
|
(*Printf.printf "Changing to stored font %s\n" identifier;*)
|
|
let fontpack, codepoints = Hashtbl.find fontpacks identifier in
|
|
(res ()).current_fontpack <- fontpack;
|
|
if dryrun then (res ()).current_fontpack_codepoints <- codepoints;
|
|
(res ()).font_size <- size;
|
|
[]
|
|
| TextSection ops -> [Pdfops.Op_BT] @ ops_of_drawops 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);
|
|
runs_of_utf8 s
|
|
| 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);
|
|
runs_of_utf8 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']
|
|
|
|
and ops_of_drawops dryrun pdf endpage filename bates batespad num page drawops =
|
|
flatten (map (ops_of_drawop dryrun pdf endpage filename bates batespad num page) drawops)
|
|
|
|
and create_form_xobject 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 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.add (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
|
|
|
|
let draw_single ~fast ~underneath ~filename ~bates ~batespad fast 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
|
|
begin
|
|
let r = save_whole_stack () in
|
|
ignore (ops_of_drawops true pdf endpage filename bates batespad 0 (hd pages) drawops);
|
|
restore_whole_stack r;
|
|
Hashtbl.clear fontpacks;
|
|
Some (ops_of_drawops false pdf endpage filename bates batespad 0 (hd pages) drawops)
|
|
end
|
|
in
|
|
let ss =
|
|
map2
|
|
(fun n p ->
|
|
if mem n range
|
|
then
|
|
(match ops with
|
|
| Some x -> x
|
|
| None ->
|
|
let r = save_whole_stack () in
|
|
ignore (ops_of_drawops true pdf endpage filename bates batespad n p drawops);
|
|
restore_whole_stack r;
|
|
Hashtbl.clear fontpacks;
|
|
ops_of_drawops 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 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
|
|
|
|
let draw ?(fast=false) ?(underneath=false) ~filename ~bates ~batespad fast range pdf drawops =
|
|
Printf.printf "%s\n" (string_of_drawops drawops);
|
|
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
|
|
while !chunks <> [] do
|
|
reset_state ();
|
|
if hd !chunks <> [] then pdf := draw_single ~fast ~underneath ~filename ~bates ~batespad fast !range !pdf (hd !chunks);
|
|
chunks := tl !chunks;
|
|
if !chunks <> [] then begin
|
|
let endpage = Pdfpage.endpage !pdf in
|
|
pdf := Cpdfpad.padafter [endpage] !pdf;
|
|
range := [endpage + 1]
|
|
end
|
|
done;
|
|
!pdf
|