54 lines
2.2 KiB
OCaml
54 lines
2.2 KiB
OCaml
open Pdfutil
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open Cpdferror
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(* FIXME Resources - what to do with each. Bookmarks? Annotations - must be duplicated... *)
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(* FIXME How to link annotations within the document work? *)
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(* FIXME Are 'changes' for change_pages important? *)
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(* FIXME Test how the sharing affects other cpdf operations - especially with -fast! *)
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(* Chop a single page into pieces. We prefer the cropbox when available. We set
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mediabox only, and delete any other boxes. *)
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(* FIXME btt / rtl / columns *)
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let get_box pdf page =
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match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
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| Some r -> Pdf.parse_rectangle pdf r
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| None -> Pdf.parse_rectangle pdf page.Pdfpage.mediabox
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let erase_boxes d =
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let f = Pdf.remove_dict_entry in
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f (f (f (f d "/CropBox") "/BleedBox") "/TrimBox") "/ArtBox"
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let chop_boxes pdf x y columns btt rtl p =
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if x < 1 || y < 1 then Cpdferror.error "chop_boxes bad specification" else
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let move_page mx my p w h dx dy =
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(*Printf.printf "move_page by %f %f\n" dx dy;*)
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let nminx, nminy, nmaxx, nmaxy = (mx +. dx, my +. dy, mx +. w +. dx, my +. h +. dy) in
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(*Printf.printf "new box: %f, %f, %f, %f\n" nminx nminy nmaxx nmaxy;*)
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{p with
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Pdfpage.mediabox = Pdf.Array [Pdf.Real nminx; Pdf.Real nminy; Pdf.Real nmaxx; Pdf.Real nmaxy];
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Pdfpage.rest = erase_boxes p.Pdfpage.rest}
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in
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let minx, miny, maxx, maxy = get_box pdf p in
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(*Printf.printf "minx, miny, maxx, maxy = %f, %f, %f, %f\n" minx miny maxx maxy;*)
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let w, h = (maxx -. minx) /. float_of_int x, (maxy -. miny) /. float_of_int y in
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let ps = ref [] in
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let move_page = move_page minx miny p w h in
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(* columns, btt, rtl *)
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for ty = y - 1 downto 0 do for tx = 0 to x - 1 do
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ps =| move_page (w *. float_of_int tx) (h *. float_of_int ty)
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done done;
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rev !ps
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(* Chop pages in the range into pieces *)
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let chop ~x ~y ~columns ~btt ~rtl pdf range =
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let pages = Pdfpage.pages_of_pagetree pdf in
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let pages =
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flatten
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(map2
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(fun n p -> if mem n range then chop_boxes pdf x y columns btt rtl p else [p])
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(ilist 1 (Pdfpage.endpage pdf))
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pages)
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in
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let changes = [] in
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Pdfpage.change_pages ~changes true pdf pages
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