779 lines
30 KiB
OCaml
779 lines
30 KiB
OCaml
open Pdfutil
|
|
open Cpdferror
|
|
|
|
(* Output information for each page *)
|
|
let output_page_info pdf range =
|
|
let pages = Pdfpage.pages_of_pagetree pdf
|
|
and labels = Pdfpagelabels.read pdf in
|
|
let getbox page box =
|
|
if box = "/MediaBox" then
|
|
match page.Pdfpage.mediabox with
|
|
| Pdf.Array [a; b; c; d] ->
|
|
Printf.sprintf "%f %f %f %f"
|
|
(Pdf.getnum a) (Pdf.getnum b) (Pdf.getnum c) (Pdf.getnum d)
|
|
| _ -> ""
|
|
else
|
|
match Pdf.lookup_direct pdf box page.Pdfpage.rest with
|
|
| Some (Pdf.Array [a; b; c; d]) ->
|
|
Printf.sprintf "%f %f %f %f"
|
|
(Pdf.getnum a) (Pdf.getnum b) (Pdf.getnum c) (Pdf.getnum d)
|
|
| _ -> ""
|
|
and rotation page =
|
|
Pdfpage.int_of_rotation page.Pdfpage.rotate
|
|
in
|
|
iter
|
|
(fun pnum ->
|
|
let page = select pnum pages in
|
|
Printf.printf "Page %i:\n" pnum;
|
|
Printf.printf "Label: %s\n"
|
|
(try Pdfpagelabels.pagelabeltext_of_pagenumber pnum labels with Not_found -> "");
|
|
Printf.printf "MediaBox: %s\n" (getbox page "/MediaBox");
|
|
Printf.printf "CropBox: %s\n" (getbox page "/CropBox");
|
|
Printf.printf "BleedBox: %s\n" (getbox page "/BleedBox");
|
|
Printf.printf "TrimBox: %s\n" (getbox page "/TrimBox");
|
|
Printf.printf "ArtBox: %s\n" (getbox page "/ArtBox");
|
|
Printf.printf "Rotation: %i\n" (rotation page))
|
|
range
|
|
|
|
let process_pages f pdf range =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
let pages', pagenumbers, matrices = (* new page objects, page number, matrix *)
|
|
split3
|
|
(map2
|
|
(fun n p -> if mem n range then f n p else (p, n, Pdftransform.i_matrix))
|
|
(ilist 1 (length pages))
|
|
pages)
|
|
in
|
|
Pdfpage.change_pages ~matrices:(combine pagenumbers matrices) true pdf pages'
|
|
|
|
let iter_pages f pdf range =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
iter2
|
|
(fun n p -> if mem n range then f n p)
|
|
(ilist 1 (length pages))
|
|
pages
|
|
|
|
let map_pages f pdf range =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
option_map2
|
|
(fun n p -> if mem n range then Some (f n p) else None)
|
|
(ilist 1 (length pages))
|
|
pages
|
|
|
|
(* Clip a page to one of its boxes, or the media box if that box is not
|
|
* present. This is a hard clip, done by using a clipping rectangle, so that
|
|
* the page may then be used as a stamp without extraneous material reapearing.
|
|
* *)
|
|
let hard_box pdf range boxname mediabox_if_missing fast =
|
|
process_pages
|
|
(Cpdfutil.ppstub (fun pagenum page ->
|
|
let minx, miny, maxx, maxy =
|
|
if boxname = "/MediaBox" then
|
|
Pdf.parse_rectangle page.Pdfpage.mediabox
|
|
else
|
|
match Pdf.lookup_direct pdf boxname page.Pdfpage.rest with
|
|
| Some a -> Pdf.parse_rectangle a
|
|
| _ ->
|
|
if mediabox_if_missing
|
|
then Pdf.parse_rectangle page.Pdfpage.mediabox
|
|
else error (Printf.sprintf "hard_box: box %s not found" boxname)
|
|
in
|
|
let ops = [Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny); Pdfops.Op_W; Pdfops.Op_n] in
|
|
Pdfpage.prepend_operators pdf ops ~fast page))
|
|
pdf
|
|
range
|
|
|
|
let shift_page ?(fast=false) dxdylist pdf pnum page =
|
|
let dx, dy = List.nth dxdylist (pnum - 1) in
|
|
let transform_op =
|
|
Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy)))
|
|
in
|
|
let page =
|
|
Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page
|
|
in
|
|
Cpdfutil.transform_annotations pdf (Pdftransform.mktranslate dx dy) page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, Pdftransform.mktranslate dx dy)
|
|
|
|
let shift_pdf ?(fast=false) dxdylist pdf range =
|
|
process_pages (shift_page ~fast dxdylist pdf) pdf range
|
|
|
|
(* Shift page data *)
|
|
let make_mediabox (xmin, ymin, xmax, ymax) =
|
|
Pdf.Array
|
|
[Pdf.Real xmin; Pdf.Real ymin; Pdf.Real xmax; Pdf.Real ymax]
|
|
|
|
(* Change the media box and other known boxes by the function [f] which takes
|
|
xmin, xmax, ymin, ymax as input. *)
|
|
let change_boxes f pdf page =
|
|
let names = ["/TrimBox"; "/ArtBox"; "/CropBox"; "/BleedBox"]
|
|
in let getbox n =
|
|
Pdf.lookup_direct pdf n page.Pdfpage.rest
|
|
in
|
|
let boxes = combine names (map getbox names) in
|
|
let toreplace = lose (function (_, None) -> true | _ -> false) boxes in
|
|
let toreplace =
|
|
map
|
|
(function (name, Some value) -> (name, value) | _ -> assert false)
|
|
toreplace
|
|
in
|
|
let rest' =
|
|
fold_left
|
|
(fun e (k, v) ->
|
|
let v =
|
|
make_mediabox (f (Pdf.parse_rectangle v))
|
|
in
|
|
Pdf.replace_dict_entry e k v)
|
|
page.Pdfpage.rest
|
|
toreplace
|
|
in
|
|
{page with
|
|
Pdfpage.mediabox =
|
|
make_mediabox (f (Pdf.parse_rectangle page.Pdfpage.mediabox));
|
|
Pdfpage.rest = rest'}
|
|
|
|
|
|
(* Scale contents *)
|
|
let scale_page_contents ?(fast=false) scale position pdf pnum page =
|
|
let (minx, miny, maxx, maxy) as box =
|
|
(* Use cropbox if available *)
|
|
Pdf.parse_rectangle
|
|
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
|
|
| Some r -> r
|
|
| None -> page.Pdfpage.mediabox)
|
|
in
|
|
let sx, sy, _ = Cpdfposition.calculate_position true 0. box Horizontal position in
|
|
let tx, ty =
|
|
let open Cpdfposition in
|
|
match position with
|
|
| Top t -> 0., -.t
|
|
| TopLeft t -> t, -.t
|
|
| TopRight t -> -.t, -.t
|
|
| Left t -> t, 0.
|
|
| BottomLeft t -> t, t
|
|
| Bottom t -> 0., t
|
|
| BottomRight t -> -.t, t
|
|
| Right t -> -.t, 0.
|
|
| _ -> 0., 0. (* centre it... FIXME: We will add a center position, eventually, for text and this... *)
|
|
in
|
|
let transform =
|
|
Pdftransform.matrix_of_transform
|
|
[Pdftransform.Translate (tx, ty);
|
|
Pdftransform.Scale ((sx, sy), scale, scale)]
|
|
in
|
|
let transform_op = Pdfops.Op_cm transform in
|
|
let page = Cpdfutil.change_pattern_matrices_page pdf transform page in
|
|
Cpdfutil.transform_annotations pdf transform page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, transform)
|
|
|
|
let scale_contents ?(fast=false) position scale pdf range =
|
|
process_pages (scale_page_contents ~fast scale position pdf) pdf range
|
|
|
|
(* Set media box *)
|
|
let set_mediabox xywhlist pdf range =
|
|
let crop_page pnum page =
|
|
let x, y, w, h = List.nth xywhlist (pnum - 1) in
|
|
{page with
|
|
Pdfpage.mediabox =
|
|
(Pdf.Array
|
|
[Pdf.Real x; Pdf.Real y;
|
|
Pdf.Real (x +. w); Pdf.Real (y +. h)])}
|
|
in
|
|
process_pages (Cpdfutil.ppstub crop_page) pdf range
|
|
|
|
(* If a cropbox exists, make it the mediabox. If not, change nothing. *)
|
|
let copy_cropbox_to_mediabox pdf range =
|
|
process_pages
|
|
(Cpdfutil.ppstub (fun _ page ->
|
|
match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
|
|
| Some pdfobject -> {page with Pdfpage.mediabox = Pdf.direct pdf pdfobject}
|
|
| None -> page))
|
|
pdf
|
|
range
|
|
|
|
let remove_cropping_pdf pdf range =
|
|
let remove_cropping_page _ page =
|
|
{page with
|
|
Pdfpage.rest =
|
|
(Pdf.remove_dict_entry page.Pdfpage.rest "/CropBox")}
|
|
in
|
|
process_pages (Cpdfutil.ppstub remove_cropping_page) pdf range
|
|
|
|
let remove_trim_pdf pdf range =
|
|
let remove_trim_page _ page =
|
|
{page with
|
|
Pdfpage.rest =
|
|
(Pdf.remove_dict_entry page.Pdfpage.rest "/TrimBox")}
|
|
in
|
|
process_pages (Cpdfutil.ppstub remove_trim_page) pdf range
|
|
|
|
let remove_art_pdf pdf range =
|
|
let remove_art_page _ page =
|
|
{page with
|
|
Pdfpage.rest =
|
|
(Pdf.remove_dict_entry page.Pdfpage.rest "/ArtBox")}
|
|
in
|
|
process_pages (Cpdfutil.ppstub remove_art_page) pdf range
|
|
|
|
let remove_bleed_pdf pdf range =
|
|
let remove_bleed_page _ page =
|
|
{page with
|
|
Pdfpage.rest =
|
|
(Pdf.remove_dict_entry page.Pdfpage.rest "/BleedBox")}
|
|
in
|
|
process_pages (Cpdfutil.ppstub remove_bleed_page) pdf range
|
|
|
|
(* Upright functionality *)
|
|
|
|
(* Return the pages from the pdf in the range, unordered. *)
|
|
let select_pages range pdf =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
option_map (function n -> try Some (select n pages) with _ -> None) range
|
|
|
|
(* If all pages are already upright, and the mediabox is (0,0)-based, do nothing
|
|
to save time. *)
|
|
let allupright range pdf =
|
|
let page_is_upright page =
|
|
page.Pdfpage.rotate = Pdfpage.Rotate0 &&
|
|
(let (minx, miny, _, _) = Pdf.parse_rectangle page.Pdfpage.mediabox in
|
|
minx < 0.001 && miny < 0.001 && minx > ~-.0.001 && miny > ~-.0.001)
|
|
in
|
|
not (mem false (map page_is_upright (select_pages range pdf)))
|
|
|
|
let upright_transform page =
|
|
let rotate =
|
|
Pdfpage.int_of_rotation page.Pdfpage.rotate
|
|
and cx, cy =
|
|
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
|
|
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
|
|
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 = Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.matrix_invert tr) page in
|
|
Cpdfutil.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 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 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 (Cpdfutil.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 (Cpdfutil.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 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 tr2 =
|
|
Pdftransform.matrix_of_op
|
|
(Pdftransform.Rotate (rotation_point, rad_of_deg r))
|
|
in
|
|
let transform_op = Pdfops.Op_cm tr in
|
|
let page = Cpdfutil.change_pattern_matrices_page pdf tr2 page in
|
|
Cpdfutil.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
|
|
and page =
|
|
Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page
|
|
in
|
|
Cpdfutil.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 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) =
|
|
(* Use cropbox if available *)
|
|
Pdf.parse_rectangle
|
|
(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 in let fy = y /. maxy in
|
|
let scale = fmin fx fy *. input_scale in
|
|
let trans_x =
|
|
match position with
|
|
Cpdfposition.Left _ -> 0.
|
|
| Cpdfposition.Right _ -> (x -. (maxx *. scale))
|
|
| _ -> (x -. (maxx *. scale)) /. 2.
|
|
and trans_y =
|
|
match position with
|
|
| Cpdfposition.Top _ -> (y -. (maxy *. scale))
|
|
| Cpdfposition.Bottom _ -> 0.
|
|
| _ -> (y -. (maxy *. scale)) /. 2.
|
|
in
|
|
(Pdftransform.matrix_of_transform
|
|
[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
|
|
Cpdfutil.transform_annotations pdf matrix page.Pdfpage.rest;
|
|
(Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast
|
|
(Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.matrix_invert 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 Printf.eprintf "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 page.Pdfpage.mediabox
|
|
in
|
|
let tr = transform_op minx miny maxx maxy in
|
|
let page = Cpdfutil.change_pattern_matrices_page pdf tr page in
|
|
Cpdfutil.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 o -> o, h -. sh -. o -. dy
|
|
| TopRight o -> w -. sw -. o, h -. sh -. o -. dy
|
|
| Left o -> o, half h -. half sh -. dy
|
|
| BottomLeft o -> o, o -. dy
|
|
| Bottom o -> half w -. half sw, o -. dy
|
|
| BottomRight o -> w -. sw -. o, o -. 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
|
|
(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
|
|
(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
|
|
Cpdfutil.transform_annotations pdf matrix o.Pdfpage.rest;
|
|
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
|
|
Cpdfutil.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
|
|
Cpdfutil.transform_annotations pdf matrix o.Pdfpage.rest;
|
|
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
|
|
Cpdfutil.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 =
|
|
Cpdfutil.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. *)
|
|
|
|
(* 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.) 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 (Cpdfutil.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 (Cpdfutil.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 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 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 (Cpdfutil.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
|
|
| _, _ ->
|
|
(*Printf.eprintf "warning: no /TrimBox found on page %i\n%!" n;*)
|
|
page
|
|
|
|
let trim_marks ?(fast=false) pdf range =
|
|
process_pages (Cpdfutil.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
|
|
(Cpdfutil.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
|
|
|