888 lines
41 KiB
OCaml
888 lines
41 KiB
OCaml
open Pdfutil
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open Pdfio
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open Cpdferror
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let debug_image_processing = ref false
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let remove x =
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try (*Printf.printf "%s\n" x;*) Sys.remove x with _ -> ()
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let pnm_white ch = output_char ch ' '
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let pnm_newline ch = output_char ch '\n'
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let pnm_output_string = Stdlib.output_string
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let pnm_header ch w h =
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pnm_white ch;
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pnm_output_string ch (string_of_int w);
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pnm_white ch;
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pnm_output_string ch (string_of_int h);
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pnm_white ch
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let pnm_to_channel_24 ch w h s =
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pnm_output_string ch "P6";
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pnm_header ch w h;
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pnm_output_string ch "255";
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pnm_newline ch;
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bytes_to_output_channel ch s
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let pnm_to_channel_8 ch w h s =
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pnm_output_string ch "P5";
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pnm_header ch w h;
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pnm_output_string ch "255";
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pnm_newline ch;
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bytes_to_output_channel ch s
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let pnm_to_channel_1_inverted ch w h s =
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pnm_output_string ch "P4";
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pnm_header ch w h;
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pnm_newline ch;
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let inverted = Pdfio.copybytes s in
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Pdfio.bytes_selfmap lnot inverted;
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bytes_to_output_channel ch inverted
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let cmyk_to_channel_32 ch w h s =
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let inverted = Pdfio.copybytes s in
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Pdfio.bytes_selfmap (fun x -> 255 - x) inverted;
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bytes_to_output_channel ch inverted
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let jbig2_serial = ref 0
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let jbig2_globals = null_hash ()
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let write_stream name stream =
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let fh = open_out_bin name in
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Pdfio.bytes_to_output_channel fh stream;
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close_out fh
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let write_image ~raw ?path_to_p2p ?path_to_im pdf resources name image =
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match Pdfimage.get_image_24bpp pdf resources image with
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| Pdfimage.JPEG (stream, _) -> write_stream (name ^ ".jpg") stream
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| Pdfimage.JPEG2000 (stream, _) -> write_stream (name ^ ".jpx") stream
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| Pdfimage.JBIG2 (stream, _, global) ->
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begin match global with
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| None ->
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(*Printf.printf "JBIG2: No global, writing plain\n";*)
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write_stream (name ^ ".jbig2") stream
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| Some g ->
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(*Printf.printf "JBIG2: there is a global\n";*)
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let go () =
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let serial, _ = Hashtbl.find jbig2_globals g in
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write_stream (name ^ ".jbig2__" ^ string_of_int serial) stream
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in
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try go () with Not_found ->
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jbig2_serial += 1;
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let globaldata =
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let obj = Pdf.lookup_obj pdf g in
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Pdfcodec.decode_pdfstream_until_unknown pdf obj;
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match obj with | Pdf.Stream {contents = (_, Got b)} -> Some b | _ -> None
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in
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match globaldata with
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| Some d ->
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Hashtbl.add jbig2_globals g (!jbig2_serial, d);
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let filename = Filename.concat (Filename.dirname name) (string_of_int !jbig2_serial ^ ".jbig2global") in
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write_stream filename d;
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go ()
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| None ->
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Pdfe.log "Could not extract JBIG2Globals. Skipping this image."
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end
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| Pdfimage.Raw (w, h, Pdfimage.BPP24, stream) ->
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let pnm = name ^ ".pnm" in
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let png = name ^ ".png" in
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let fh = open_out_bin pnm in
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pnm_to_channel_24 fh w h stream;
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close_out fh;
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begin match path_to_p2p with
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| None ->
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begin match path_to_im with
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None ->
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if not raw then Pdfe.log "Neither pnm2png nor imagemagick found. Specify with -p2p or -im\n"
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| Some path_to_im ->
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begin match
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Sys.command (Filename.quote_command path_to_im [pnm; png])
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with
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0 -> remove pnm
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| _ ->
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Pdfe.log "Call to imagemagick failed: did you specify -p2p or -im correctly?\n";
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remove pnm
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end
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end
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| Some path_to_p2p ->
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begin match
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Sys.command (Filename.quote_command path_to_p2p ~stdout:png ["-gamma"; "0.45"; "-quiet"; pnm])
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with
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| 0 -> remove pnm
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| _ ->
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Pdfe.log "Call to pnmtopng failed: did you specify -p2p correctly?\n";
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remove pnm
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end
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end
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| _ ->
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Pdfe.log (Printf.sprintf "Unsupported image type when extracting image %s " name)
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let written = ref []
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let extract_images_inner ~raw ?path_to_p2p ?path_to_im encoding serial pdf resources stem pnum images =
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let names = map
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(fun _ ->
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Cpdfbookmarks.name_of_spec
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encoding [] pdf 0 (stem ^ "-p" ^ string_of_int pnum)
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(let r = !serial in serial := !serial + 1; r) "" 0 0) (indx images)
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in
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iter2 (write_image ~raw ?path_to_p2p ?path_to_im pdf resources) names images
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let rec extract_images_form_xobject ~raw ?path_to_p2p ?path_to_im encoding dedup dedup_per_page pdf serial stem pnum form =
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let resources =
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match Pdf.lookup_direct pdf "/Resources" form with
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Some (Pdf.Dictionary d) -> Pdf.Dictionary d
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| _ -> Pdf.Dictionary []
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in
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let images =
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let xobjects =
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match Pdf.lookup_direct pdf "/XObject" resources with
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| Some (Pdf.Dictionary elts) -> map snd elts
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| _ -> []
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in
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(* Remove any already in !written. Add any remaining to !written, if !args.dedup or !args.dedup_page *)
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let images = keep (fun o -> Pdf.lookup_direct pdf "/Subtype" o = Some (Pdf.Name "/Image")) xobjects in
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let already_written, images = List.partition (function Pdf.Indirect n -> mem n !written | _ -> false) images in
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if dedup || dedup_per_page then
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written := (option_map (function Pdf.Indirect n -> Some n | _ -> None) images) @ !written;
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images
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in
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extract_images_inner ~raw ?path_to_p2p ?path_to_im encoding serial pdf resources stem pnum images
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let extract_images ?(raw=false) ?path_to_p2p ?path_to_im encoding dedup dedup_per_page pdf range stem =
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Hashtbl.clear jbig2_globals;
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jbig2_serial := 0;
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if dedup || dedup_per_page then written := [];
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let pdf_pages = Pdfpage.pages_of_pagetree pdf in
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let pages =
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option_map
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(function (i, pdf_pages) -> if mem i range then Some pdf_pages else None)
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(combine (indx pdf_pages) pdf_pages)
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in
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let serial = ref 0 in
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iter2
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(fun page pnum ->
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if dedup_per_page then written := [];
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let xobjects =
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match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
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| Some (Pdf.Dictionary elts) -> map snd elts
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| _ -> []
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in
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let images = keep (fun o -> Pdf.lookup_direct pdf "/Subtype" o = Some (Pdf.Name "/Image")) xobjects in
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let already_written, images = List.partition (function Pdf.Indirect n -> mem n !written | _ -> false) images in
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if dedup || dedup_per_page then
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written := (option_map (function Pdf.Indirect n -> Some n | _ -> None) images) @ !written;
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let forms = keep (fun o -> Pdf.lookup_direct pdf "/Subtype" o = Some (Pdf.Name "/Form")) xobjects in
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extract_images_inner ~raw ?path_to_p2p ?path_to_im encoding serial pdf page.Pdfpage.resources stem pnum images;
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iter (extract_images_form_xobject ~raw ?path_to_p2p ?path_to_im encoding dedup dedup_per_page pdf serial stem pnum) forms)
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pages
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(indx pages)
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(* Image resolution *)
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type xobj =
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| Image of int * int (* width, height *)
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| Form of Pdftransform.transform_matrix * Pdf.pdfobject * Pdf.pdfobject (* Will add actual data later. *)
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let image_results = ref []
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let rec image_resolution_page pdf page pagenum dpi images =
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try
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let pageops = Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content
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and transform = ref [ref Pdftransform.i_matrix] in
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iter
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(function
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| Pdfops.Op_cm matrix ->
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begin match !transform with
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| [] -> raise (Failure "no transform")
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| _ -> (hd !transform) := Pdftransform.matrix_compose !(hd !transform) matrix
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end
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| Pdfops.Op_Do xobject ->
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let trans (x, y) =
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match !transform with
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| [] -> raise (Failure "no transform")
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| _ -> Pdftransform.transform_matrix !(hd !transform) (x, y)
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in
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let o = trans (0., 0.)
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and x = trans (1., 0.)
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and y = trans (0., 1.)
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in
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(*i Printf.printf "o = %f, %f, x = %f, %f, y = %f, %f\n" (fst o) (snd o) (fst x) (snd x) (fst y) (snd y); i*)
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let rec lookup_image k = function
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| [] -> assert false
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| (_, a, _, _) as h::_ when a = k -> h
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| _::t -> lookup_image k t
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in
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begin match lookup_image xobject images with
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| (pagenum, name, Form (xobj_matrix, content, resources), objnum) ->
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let content =
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(* Add in matrix etc. *)
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let total_matrix = Pdftransform.matrix_compose xobj_matrix !(hd !transform) in
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let ops =
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Pdfops.Op_cm total_matrix::
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Pdfops.parse_operators pdf resources [content]
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in
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Pdfops.stream_of_ops ops
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in
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let page =
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{Pdfpage.content = [content];
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Pdfpage.mediabox = Pdfpage.rectangle_of_paper Pdfpaper.a4;
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Pdfpage.resources = resources;
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Pdfpage.rotate = Pdfpage.Rotate0;
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Pdfpage.rest = Pdf.Dictionary []}
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in
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let newpdf = Pdfpage.change_pages false pdf [page] in
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image_resolution newpdf [pagenum] dpi
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| (pagenum, name, Image (w, h), objnum) ->
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let lx = Pdfunits.inches (distance_between o x) Pdfunits.PdfPoint in
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let ly = Pdfunits.inches (distance_between o y) Pdfunits.PdfPoint in
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let wdpi = float w /. lx
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and hdpi = float h /. ly in
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image_results := (pagenum, xobject, w, h, wdpi, hdpi, objnum)::!image_results
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(*Printf.printf "%i, %s, %i, %i, %f, %f\n" pagenum xobject w h wdpi hdpi*)
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(*i else
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Printf.printf "S %i, %s, %i, %i, %f, %f\n" pagenum xobject (int_of_float w) (int_of_float h) wdpi hdpi i*)
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end
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| Pdfops.Op_q ->
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begin match !transform with
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| [] -> raise (Failure "Unbalanced q/Q ops")
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| h::t ->
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let h' = ref Pdftransform.i_matrix in
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h' := !h;
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transform := h'::h::t
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end
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| Pdfops.Op_Q ->
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begin match !transform with
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| [] -> raise (Failure "Unbalanced q/Q ops")
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| _ -> transform := tl !transform
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end
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| _ -> ())
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pageops
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with
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e -> Printf.printf "Error %s\n" (Printexc.to_string e); flprint "\n"
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and image_resolution pdf range dpi =
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let images = ref [] in
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Cpdfpage.iter_pages
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(fun pagenum page ->
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(* 1. Get all image names and their native resolutions from resources as string * int * int *)
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match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
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| Some (Pdf.Dictionary xobjects) ->
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iter
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(function (name, xobject) ->
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let objnum = match xobject with Pdf.Indirect i -> i | _ -> 0 in
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match Pdf.lookup_direct pdf "/Subtype" xobject with
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| Some (Pdf.Name "/Image") ->
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let width =
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match Pdf.lookup_direct pdf "/Width" xobject with
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| Some x -> Pdf.getnum pdf x
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| None -> 1.
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and height =
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match Pdf.lookup_direct pdf "/Height" xobject with
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| Some x -> Pdf.getnum pdf x
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| None -> 1.
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in
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images := (pagenum, name, Image (int_of_float width, int_of_float height), objnum)::!images
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| Some (Pdf.Name "/Form") ->
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let resources =
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match Pdf.lookup_direct pdf "/Resources" xobject with
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| None -> page.Pdfpage.resources (* Inherit from page or form above. *)
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| Some r -> r
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and contents =
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xobject
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and matrix =
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match Pdf.lookup_direct pdf "/Matrix" xobject with
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| Some (Pdf.Array [a; b; c; d; e; f]) ->
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{Pdftransform.a = Pdf.getnum pdf a; Pdftransform.b = Pdf.getnum pdf b; Pdftransform.c = Pdf.getnum pdf c;
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Pdftransform.d = Pdf.getnum pdf d; Pdftransform.e = Pdf.getnum pdf e; Pdftransform.f = Pdf.getnum pdf f}
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| _ -> Pdftransform.i_matrix
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in
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images := (pagenum, name, Form (matrix, contents, resources), objnum)::!images
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| _ -> ()
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)
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xobjects
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| _ -> ())
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pdf
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range;
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(* Now, split into differing pages, and call [image_resolution_page] on each one *)
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let pagesplits =
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map
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(function (a, _, _, _)::_ as ls -> (a, ls) | _ -> assert false)
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(collate (fun (a, _, _, _) (b, _, _, _) -> compare a b) (rev !images))
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and pages =
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Pdfpage.pages_of_pagetree pdf
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in
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iter
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(function (pagenum, images) ->
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let page = select pagenum pages in
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image_resolution_page pdf page pagenum dpi images)
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pagesplits
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let image_resolution pdf range dpi =
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image_results := [];
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image_resolution pdf range dpi;
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rev !image_results
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(* All the images in file referenced at least once from the given range of pages. *)
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let images pdf range =
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let images = null_hash () in
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let formnums = null_hash () in
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let rec process_xobject resources pagenum page (name, xobject) =
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match Pdf.lookup_direct pdf "/Subtype" xobject with
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| Some (Pdf.Name "/Image") ->
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begin match xobject with
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| Pdf.Indirect i ->
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begin match Hashtbl.find images i with
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| (pagenums, n, w, h, s, bpc, cs, f) ->
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Hashtbl.replace images i (pagenum::pagenums, n, w, h, s, bpc, cs, f)
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| exception Not_found ->
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let width =
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match Pdf.lookup_direct pdf "/Width" xobject with
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| Some x -> Pdf.getnum pdf x
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| None -> 1.
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and height =
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match Pdf.lookup_direct pdf "/Height" xobject with
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| Some x -> Pdf.getnum pdf x
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| None -> 1.
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and size =
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match Pdf.lookup_direct pdf "/Length" xobject with
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| Some (Pdf.Integer x) -> x
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| _ -> 0
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and bpc =
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match Pdf.lookup_direct pdf "/BitsPerComponent" xobject with
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| Some (Pdf.Integer x) -> x
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| _ -> 0
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and colourspace =
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match Pdf.lookup_direct pdf "/ColorSpace" xobject with
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| Some x -> Some (Pdfspace.string_of_colourspace (Pdfspace.read_colourspace pdf resources x))
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| None -> None
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and filter =
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match Pdf.lookup_direct pdf "/Filter" xobject with
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| Some (Pdf.Array [x]) | Some x -> Some (Pdfwrite.string_of_pdf x)
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| None -> None
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in
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Hashtbl.replace images i ([pagenum], name, int_of_float width, int_of_float height, size, bpc, colourspace, filter)
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end
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| _ -> ()
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end
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| Some (Pdf.Name "/Form") ->
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begin match xobject with
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| Pdf.Indirect i ->
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begin match Hashtbl.find formnums i with
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| () -> ()
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| exception Not_found ->
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Hashtbl.add formnums i ();
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begin match Pdf.lookup_direct pdf "/Resources" xobject with
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| Some r ->
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begin match Pdf.lookup_direct pdf "/XObject" r with
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| Some (Pdf.Dictionary xobjects) -> iter (process_xobject r pagenum page) xobjects
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| _ -> ()
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end
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| None -> ()
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end
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end
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| _ -> ()
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end
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| _ -> ()
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in
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Cpdfpage.iter_pages
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(fun pagenum page ->
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match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
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| Some (Pdf.Dictionary xobjects) ->
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iter (process_xobject page.Pdfpage.resources pagenum page) xobjects
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| _ -> ())
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pdf
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range;
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let images = list_of_hashtbl images in
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let images = map (fun (i, (pnums, n, w, h, s, bpc, c, filter)) -> (i, (setify (sort compare pnums), n, w, h, s, bpc, c, filter))) images in
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let images = sort (fun (_, (pnums, _, _, _, _, _, _, _)) (_, (pnums', _, _, _, _, _, _, _)) -> compare (hd pnums) (hd pnums')) images in
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`List
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(map
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(fun (i, (pnums, n, w, h, size, bpc, cs, filter)) ->
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`Assoc [("Object", `Int i);
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("Pages", `List (map (fun x -> `Int x) pnums));
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("Name", `String n);
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("Width", `Int w);
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("Height", `Int h);
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("Bytes", `Int size);
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("BitsPerComponent", `Int bpc);
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("Colourspace", match cs with None -> `Null | Some s -> `String s);
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("Filter", match filter with None -> `Null | Some s -> `String s)])
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images)
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let obj_of_jpeg_data data =
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let w, h = Cpdfjpeg.jpeg_dimensions data in
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let d =
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["/Length", Pdf.Integer (Pdfio.bytes_size data);
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"/Filter", Pdf.Name "/DCTDecode";
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"/BitsPerComponent", Pdf.Integer 8;
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"/ColorSpace", Pdf.Name "/DeviceRGB";
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"/Subtype", Pdf.Name "/Image";
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"/Width", Pdf.Integer w;
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"/Height", Pdf.Integer h]
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in
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Pdf.Stream {contents = (Pdf.Dictionary d, Pdf.Got data)}, []
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let obj_of_png_data data =
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let png = Cpdfpng.read_png (Pdfio.input_of_bytes data) in
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let d =
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["/Length", Pdf.Integer (Pdfio.bytes_size png.idat);
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"/Filter", Pdf.Name "/FlateDecode";
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"/Subtype", Pdf.Name "/Image";
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"/BitsPerComponent", Pdf.Integer png.bitdepth;
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"/ColorSpace", Pdf.Name (match png.colortype with 0 -> "/DeviceGray" | 2 -> "/DeviceRGB" | _ -> error "obj_of_png_data 1");
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"/DecodeParms", Pdf.Dictionary
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|
["/BitsPerComponent", Pdf.Integer png.bitdepth;
|
|
"/Colors", Pdf.Integer (match png.colortype with 0 -> 1 | 2 -> 3 | _ -> error "obj_of_png_data 2");
|
|
"/Columns", Pdf.Integer png.width;
|
|
"/Predictor", Pdf.Integer 15];
|
|
"/Width", Pdf.Integer png.width;
|
|
"/Height", Pdf.Integer png.height]
|
|
in
|
|
Pdf.Stream {contents = (Pdf.Dictionary d, Pdf.Got png.idat)}, []
|
|
|
|
let jbig2_dimensions data =
|
|
(bget data 11 * 256 * 256 * 256 + bget data 12 * 256 * 256 + bget data 13 * 256 + bget data 14,
|
|
bget data 15 * 256 * 256 * 256 + bget data 16 * 256 * 256 + bget data 17 * 256 + bget data 18)
|
|
|
|
let obj_of_jbig2_data ?global data =
|
|
let d, extra =
|
|
let decodeparms, extra =
|
|
match global with
|
|
| Some data ->
|
|
[("/DecodeParms", Pdf.Dictionary [("/JBIG2Globals", Pdf.Indirect 10000)])],
|
|
[(10000, Pdf.Stream {contents = (Pdf.Dictionary [("/Length", Pdf.Integer (bytes_size data))], Pdf.Got data)})]
|
|
| None ->
|
|
[], []
|
|
in
|
|
let w, h = jbig2_dimensions data in
|
|
[("/Length", Pdf.Integer (Pdfio.bytes_size data));
|
|
("/Filter", Pdf.Name "/JBIG2Decode");
|
|
("/Subtype", Pdf.Name "/Image");
|
|
("/BitsPerComponent", Pdf.Integer 1);
|
|
("/ColorSpace", Pdf.Name "/DeviceGray");
|
|
("/Width", Pdf.Integer w);
|
|
("/Height", Pdf.Integer h)]
|
|
@ decodeparms, extra
|
|
in
|
|
Pdf.Stream {contents = (Pdf.Dictionary d, Pdf.Got data)}, extra
|
|
|
|
let image_of_input fobj i =
|
|
let pdf = Pdf.empty () in
|
|
let data = Pdfio.bytes_of_input i 0 i.Pdfio.in_channel_length in
|
|
let obj, extras = fobj () data in
|
|
iter (Pdf.addobj_given_num pdf) extras;
|
|
let w = match Pdf.lookup_direct pdf "/Width" obj with Some x -> Pdf.getnum pdf x | _ -> assert false in
|
|
let h = match Pdf.lookup_direct pdf "/Height" obj with Some x -> Pdf.getnum pdf x | _ -> assert false in
|
|
let page =
|
|
{Pdfpage.content =
|
|
[Pdfops.stream_of_ops
|
|
[Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (0., 0.);
|
|
Pdftransform.Scale ((0., 0.), w, h)]);
|
|
Pdfops.Op_Do "/I0"]];
|
|
Pdfpage.mediabox = Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real w; Pdf.Real h];
|
|
Pdfpage.resources =
|
|
Pdf.Dictionary
|
|
["/XObject", Pdf.Dictionary ["/I0", Pdf.Indirect (Pdf.addobj pdf obj)]];
|
|
Pdfpage.rotate = Pdfpage.Rotate0;
|
|
Pdfpage.rest = Pdf.Dictionary []}
|
|
in
|
|
let pdf, pageroot = Pdfpage.add_pagetree [page] pdf in
|
|
Pdfpage.add_root pageroot [] pdf
|
|
|
|
let jpeg_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~q ~path_to_convert s dict reference =
|
|
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
|
|
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
|
|
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else
|
|
Pdf.getstream s;
|
|
let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
|
|
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else
|
|
let out = Filename.temp_file "cpdf" "convertin" ^ ".jpg" in
|
|
let out2 = Filename.temp_file "cpdf" "convertout" ^ ".jpg" in
|
|
let fh = open_out_bin out in
|
|
begin match s with Pdf.Stream {contents = _, Pdf.Got d} -> Pdfio.bytes_to_output_channel fh d | _ -> () end;
|
|
close_out fh;
|
|
let retcode =
|
|
let command =
|
|
(Filename.quote_command path_to_convert [out; "-quality"; string_of_float q ^ "%"; out2]) (*FIXME check percentage as float here *)
|
|
in
|
|
(*Printf.printf "%S\n" command;*) Sys.command command
|
|
in
|
|
if retcode = 0 then
|
|
begin
|
|
let result = open_in_bin out2 in
|
|
let newsize = in_channel_length result in
|
|
let perc_ok = float newsize /. float size < percentage_threshold /. 100. in
|
|
if newsize < size && perc_ok then
|
|
begin
|
|
if !debug_image_processing then Printf.printf "JPEG to JPEG %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.));
|
|
reference := Pdf.add_dict_entry dict "/Length" (Pdf.Integer newsize), Pdf.Got (Pdfio.bytes_of_input_channel result)
|
|
end
|
|
else
|
|
begin
|
|
if !debug_image_processing then Printf.printf "no size reduction\n%!"
|
|
end;
|
|
close_in result
|
|
end
|
|
else
|
|
begin Printf.printf "external process failed\n%!" end;
|
|
remove out;
|
|
remove out2
|
|
|
|
let suitable_num pdf dict =
|
|
match Pdf.lookup_direct pdf "/ColorSpace" dict with
|
|
| Some (Pdf.Name "/DeviceRGB") -> 3
|
|
| Some (Pdf.Name "/DeviceGray") -> 1
|
|
| Some (Pdf.Name "/DeviceCMYK") -> 4
|
|
| Some (Pdf.Array [Pdf.Name "/ICCBased"; stream]) ->
|
|
begin match Pdf.lookup_direct pdf "/N" stream with
|
|
| Some (Pdf.Integer 3) -> 3
|
|
| Some (Pdf.Integer 1) -> 1
|
|
| Some (Pdf.Integer 4) -> 4
|
|
| _ -> 0
|
|
end
|
|
| Some (Pdf.Array (Pdf.Name ("/Separation")::_)) -> ~-1
|
|
| Some (Pdf.Array (Pdf.Name ("/Indexed")::_)) -> ~-2
|
|
| _ -> 0
|
|
|
|
let lossless_out pdf ~pixel_threshold ~length_threshold extension s dict reference =
|
|
let old = !reference in
|
|
let restore () = reference := old in
|
|
let bpc = Pdf.lookup_direct pdf "/BitsPerComponent" dict in
|
|
let components = suitable_num pdf dict in
|
|
match components, bpc with
|
|
| (1 | 3 | 4 | -1 | -2), Some (Pdf.Integer 8) ->
|
|
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
|
|
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
|
|
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!"; None) else
|
|
let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
|
|
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!"; None) else
|
|
begin
|
|
Pdfcodec.decode_pdfstream_until_unknown pdf s;
|
|
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with Some _ -> restore (); None | None ->
|
|
let out = Filename.temp_file "cpdf" "convertin" ^ (if suitable_num pdf dict < 4 then ".pnm" else ".cmyk") in
|
|
let out2 = Filename.temp_file "cpdf" "convertout" ^ extension in
|
|
let fh = open_out_bin out in
|
|
let data = match s with Pdf.Stream {contents = _, Pdf.Got d} -> d | _ -> assert false in
|
|
(if components = 3 then pnm_to_channel_24 else
|
|
if components = 4 then cmyk_to_channel_32 else pnm_to_channel_8) fh w h data;
|
|
close_out fh;
|
|
Some (out, out2, size, components, w, h)
|
|
end
|
|
| colspace, bpc ->
|
|
let colspace = Pdf.lookup_direct pdf "/ColorSpace" dict in
|
|
let colspace, bpc, filter =
|
|
(match colspace with None -> "none" | Some x -> Pdfwrite.string_of_pdf x),
|
|
(match bpc with None -> "none" | Some x -> Pdfwrite.string_of_pdf x),
|
|
(match Pdf.lookup_direct pdf "/Filter" dict with None -> "none" | Some x -> Pdfwrite.string_of_pdf x)
|
|
in
|
|
print_string (Pdfwrite.string_of_pdf dict);
|
|
print_string (Printf.sprintf "%s (%s) [%s]\n" colspace bpc filter);
|
|
if !debug_image_processing then Printf.printf "colourspace not suitable\n%!";
|
|
restore ();
|
|
None (* an image we cannot or do not handle *)
|
|
|
|
let lossless_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~qlossless ~path_to_convert s dict reference =
|
|
match lossless_out pdf ~pixel_threshold ~length_threshold ".jpg" s dict reference with None -> () | Some (out, out2, size, components, w, h) ->
|
|
let retcode =
|
|
let command =
|
|
(Filename.quote_command path_to_convert
|
|
((if components = 4 then ["-depth"; "8"; "-size"; string_of_int w ^ "x" ^ string_of_int h] else []) @
|
|
[out; "-quality"; string_of_float qlossless ^ "%"] @
|
|
(if components = 1 then ["-colorspace"; "Gray"] else if components = 4 then ["-colorspace"; "CMYK"] else []) @
|
|
[out2]))
|
|
in
|
|
(*Printf.printf "%S\n" command;*) Sys.command command
|
|
in
|
|
if retcode = 0 then
|
|
begin
|
|
let result = open_in_bin out2 in
|
|
let newsize = in_channel_length result in
|
|
let perc_ok = float newsize /. float size < percentage_threshold /. 100. in
|
|
if newsize < size && perc_ok then
|
|
begin
|
|
if !debug_image_processing then Printf.printf "lossless to JPEG %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.));
|
|
reference :=
|
|
(Pdf.add_dict_entry
|
|
(Pdf.add_dict_entry dict "/Length" (Pdf.Integer newsize))
|
|
"/Filter"
|
|
(Pdf.Name "/DCTDecode")),
|
|
Pdf.Got (Pdfio.bytes_of_input_channel result)
|
|
end
|
|
else
|
|
begin
|
|
if !debug_image_processing then Printf.printf "no size reduction\n%!"
|
|
end;
|
|
close_in result
|
|
end;
|
|
remove out;
|
|
remove out2
|
|
|
|
let lossless_resample pdf ~pixel_threshold ~length_threshold ~factor ~interpolate ~path_to_convert s dict reference =
|
|
match lossless_out pdf ~pixel_threshold ~length_threshold ".png" s dict reference with
|
|
| None -> ()
|
|
| Some (_, _, _, 4, _, _) -> Printf.printf "lossless resampling for CMYK not supported yet\n%!"
|
|
| Some (out, out2, size, components, w, h) ->
|
|
let retcode =
|
|
let command =
|
|
Filename.quote_command path_to_convert
|
|
((if components = 4 then ["-depth"; "8"; "-size"; string_of_int w ^ "x" ^ string_of_int h] else []) @
|
|
(if components = 1 then ["-define"; "png:color-type=0"; "-colorspace"; "Gray"] else if components = 3 then ["-define"; "-png:color-type=2"; "-colorspace"; "RGB"] else if components = 4 then ["-colorspace"; "CMYK"] else []) @
|
|
[if interpolate && components > -2 then "-resize" else "-sample"; string_of_float factor ^ "%"; out; out2])
|
|
in
|
|
(*Printf.printf "%S\n" command;*)
|
|
Sys.command command
|
|
in
|
|
try
|
|
if retcode = 0 then
|
|
begin
|
|
let result = open_in_bin out2 in
|
|
let newsize = in_channel_length result in
|
|
if newsize < size then
|
|
begin
|
|
if !debug_image_processing then Printf.printf "lossless resample %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.));
|
|
reference :=
|
|
(match fst (obj_of_png_data (Pdfio.bytes_of_input_channel result)) with
|
|
| Pdf.Stream {contents = Pdf.Dictionary d, data} ->
|
|
let d' = fold_right (fun (k, v) d -> add k v d) d (match dict with Pdf.Dictionary x -> x | _ -> []) in
|
|
(Pdf.Dictionary d', data)
|
|
| _ -> assert false)
|
|
end
|
|
else
|
|
begin
|
|
if !debug_image_processing then Printf.printf "no size reduction\n%!"
|
|
end;
|
|
close_in result
|
|
end(*;
|
|
remove out;
|
|
remove out2
|
|
remove out3*)
|
|
with _ -> () (* FIXME Remove *)
|
|
|
|
let lossless_resample_target_dpi objnum pdf ~pixel_threshold ~length_threshold ~factor ~target_dpi_info ~interpolate ~path_to_convert s dict reference =
|
|
Printf.printf "lossless_resample_target_dpi\n";
|
|
let real_factor = factor /. Hashtbl.find target_dpi_info objnum *. 100. in
|
|
Printf.printf "real_factor = %f\n" real_factor;
|
|
if real_factor < 100. then
|
|
lossless_resample pdf ~pixel_threshold ~length_threshold ~factor:real_factor ~interpolate ~path_to_convert s dict reference
|
|
|
|
let recompress_1bpp_jbig2_lossless ~pixel_threshold ~length_threshold ~path_to_jbig2enc pdf s dict reference =
|
|
let old = !reference in
|
|
let restore () = reference := old in
|
|
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
|
|
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
|
|
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else (* (but also, jbig2enc fails on tiny images) *)
|
|
let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
|
|
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else
|
|
begin
|
|
Pdfcodec.decode_pdfstream_until_unknown pdf s;
|
|
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with
|
|
| Some x ->
|
|
if !debug_image_processing then Printf.printf "could not decode - skipping %s length %i\n%!" (Pdfwrite.string_of_pdf x) size;
|
|
restore ()
|
|
| None ->
|
|
let out = Filename.temp_file "cpdf" "convertin" ^ ".pnm" in
|
|
let out2 = Filename.temp_file "cpdf" "convertout" ^ ".jbig2" in
|
|
let fh = open_out_bin out in
|
|
let data = match s with Pdf.Stream {contents = _, Pdf.Got d} -> d | _ -> assert false in
|
|
pnm_to_channel_1_inverted fh w h data;
|
|
close_out fh;
|
|
let retcode =
|
|
let command = Filename.quote_command ~stdout:out2 path_to_jbig2enc ["-d"; "-p"; out] in
|
|
(*Printf.printf "%S\n" command;*) Sys.command command
|
|
in
|
|
if retcode = 0 then
|
|
begin
|
|
let result = open_in_bin out2 in
|
|
let newsize = in_channel_length result in
|
|
if newsize < size then
|
|
begin
|
|
if !debug_image_processing then Printf.printf "1bpp to JBIG2 %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.));
|
|
reference :=
|
|
(Pdf.remove_dict_entry
|
|
(Pdf.add_dict_entry
|
|
(Pdf.add_dict_entry dict "/Length" (Pdf.Integer newsize))
|
|
"/Filter"
|
|
(Pdf.Name "/JBIG2Decode")) "/DecodeParms"),
|
|
Pdf.Got (Pdfio.bytes_of_input_channel result)
|
|
end
|
|
else
|
|
begin
|
|
if !debug_image_processing then Printf.printf "no size reduction\n%!"
|
|
end;
|
|
close_in result
|
|
end;
|
|
remove out;
|
|
remove out2
|
|
end
|
|
|
|
(* Recompress 1bpp images (except existing JBIG2 compressed ones) to lossy jbig2 *)
|
|
let preprocess_jbig2_lossy ~path_to_jbig2enc ~jbig2_lossy_threshold ~length_threshold ~pixel_threshold ~dpi_threshold inrange highdpi pdf =
|
|
let objnum_name_pairs = ref [] in
|
|
let process_obj objnum s =
|
|
match s with
|
|
| Pdf.Stream ({contents = dict, _} as reference) ->
|
|
let old = !reference in
|
|
let restore () = reference := old in
|
|
if Hashtbl.mem inrange objnum && (dpi_threshold = 0. || Hashtbl.mem highdpi objnum) then begin match
|
|
Pdf.lookup_direct pdf "/Subtype" dict,
|
|
Pdf.lookup_direct pdf "/BitsPerComponent" dict,
|
|
Pdf.lookup_direct pdf "/ImageMask" dict
|
|
with
|
|
| Some (Pdf.Name "/Image"), Some (Pdf.Integer 1), _
|
|
| Some (Pdf.Name "/Image"), _, Some (Pdf.Boolean true) ->
|
|
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
|
|
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
|
|
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else (* (but also, jbig2enc fails on tiny images) *)
|
|
let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
|
|
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else
|
|
begin
|
|
Pdfcodec.decode_pdfstream_until_unknown pdf s;
|
|
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with
|
|
| Some x ->
|
|
if !debug_image_processing then Printf.printf "could not decode - skipping %s length %i\n%!" (Pdfwrite.string_of_pdf x) size;
|
|
restore ()
|
|
| None ->
|
|
let out = Filename.temp_file "cpdf" "convertin" ^ ".pnm" in
|
|
let fh = open_out_bin out in
|
|
let data = match s with Pdf.Stream {contents = _, Pdf.Got d} -> d | _ -> assert false in
|
|
pnm_to_channel_1_inverted fh w h data;
|
|
close_out fh;
|
|
if !debug_image_processing then Printf.printf "obj %i is suitable\n%!" objnum;
|
|
objnum_name_pairs := (objnum, out)::!objnum_name_pairs
|
|
end
|
|
| _ -> () (* not a 1bpp image *)
|
|
end
|
|
| _ -> () (* not a stream *)
|
|
in
|
|
Pdf.objiter process_obj pdf;
|
|
if length !objnum_name_pairs > 10000 then Pdfe.log "Too many jbig2 streams" else
|
|
if length !objnum_name_pairs = 0 then () else
|
|
let jbig2out = Filename.temp_file "cpdf" "jbig2" in
|
|
let retcode =
|
|
let command =
|
|
Filename.quote_command
|
|
path_to_jbig2enc
|
|
?stderr:(if !debug_image_processing then None else Some Filename.null)
|
|
(["-p"; "-s"; "-d"; "-t"; string_of_float jbig2_lossy_threshold; "-b"; jbig2out] @ map snd !objnum_name_pairs)
|
|
in
|
|
(*Printf.printf "%S\n" command;*) Sys.command command
|
|
in
|
|
iter remove (map snd !objnum_name_pairs);
|
|
if retcode = 0 then
|
|
begin
|
|
let globals = bytes_of_string (contents_of_file (jbig2out ^ ".sym")) in
|
|
let globalobj =
|
|
Pdf.addobj pdf (Pdf.Stream {contents = Pdf.Dictionary [("/Length", Pdf.Integer (bytes_size globals))], Pdf.Got globals})
|
|
in
|
|
iter2
|
|
(fun (objnum, _) i ->
|
|
let data = bytes_of_string (contents_of_file (jbig2out ^ Printf.sprintf ".%04i" i)) in
|
|
let basic_obj =
|
|
Pdf.Stream
|
|
{contents =
|
|
Pdf.Dictionary [("/Length", Pdf.Integer (bytes_size data));
|
|
("/Filter", Pdf.Name "/JBIG2Decode");
|
|
("/DecodeParms", Pdf.Dictionary [("/JBIG2Globals", Pdf.Indirect globalobj)])],
|
|
Pdf.Got data}
|
|
in
|
|
let dict = match Pdf.lookup_obj pdf objnum with Pdf.Stream {contents = d, _} -> d | _ -> Pdf.Dictionary [] in
|
|
Pdf.addobj_given_num pdf
|
|
(objnum,
|
|
(match basic_obj with
|
|
| Pdf.Stream {contents = Pdf.Dictionary d, data} ->
|
|
let d' = fold_right (fun (k, v) d -> add k v d) d (match dict with Pdf.Dictionary x -> x | _ -> []) in
|
|
Pdf.Stream {contents = Pdf.Dictionary d', data}
|
|
| _ -> assert false)))
|
|
!objnum_name_pairs
|
|
(indx0 !objnum_name_pairs)
|
|
end
|
|
else
|
|
begin
|
|
Pdfe.log "Call to jbig2enc failed"
|
|
end;
|
|
iter (fun i -> remove (jbig2out ^ Printf.sprintf ".%04i" i)) (indx0 !objnum_name_pairs);
|
|
remove (jbig2out ^ ".sym")
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let process
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~q ~qlossless ~onebppmethod ~jbig2_lossy_threshold ~length_threshold ~percentage_threshold ~pixel_threshold ~dpi_threshold
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~factor ~interpolate ~path_to_jbig2enc ~path_to_convert range pdf
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=
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let inrange =
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match images pdf range with
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| `List l -> hashset_of_list (map (function `Assoc (("Object", `Int i)::_) -> i | _ -> assert false) l)
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| _ -> assert false
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in
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let highdpi, target_dpi_info =
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let objnums, dpi =
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if dpi_threshold = 0. && factor > 0. then ([], []) else
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let results = image_resolution pdf range max_float in
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(*iter (fun (_, _, _, _, wdpi, hdpi, objnum) -> Printf.printf "From image_resolution %f %f %i\n" wdpi hdpi objnum) results;*)
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let cmp (_, _, _, _, _, _, a) (_, _, _, _, _, _, b) = compare a b in
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let sets = collate cmp (sort cmp results) in
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let heads = map hd (map (sort (fun (_, _, _, _, a, b, _) (_, _, _, _, c, d, _) -> compare (fmin a b) (fmin c d))) sets) in
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(*iter (fun (_, _, _, _, wdpi, hdpi, objnum) -> Printf.printf "Lowest resolution exemplar %f %f %i\n" wdpi hdpi objnum) heads;*)
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let needed = keep (fun (_, _, _, _, wdpi, hdpi, objnum) -> fmin wdpi hdpi > dpi_threshold) heads in
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(*iter (fun (_, _, _, _, wdpi, hdpi, objnum) -> Printf.printf "keep %f %f %i\n" wdpi hdpi objnum) needed;*)
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map (fun (_, _, _, _, _, _, objnum) -> objnum) needed,
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let r =
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map (fun (_, _, _, _, wdpi, hdpi, objnum) -> (objnum, fmin wdpi hdpi)) heads
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in
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iter (fun (x, d) -> Printf.printf "obj %i at %f dpi\n" x d) r; r
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in
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hashset_of_list objnums, hashtable_of_dictionary dpi
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in
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begin match onebppmethod with "JBIG2Lossy" -> preprocess_jbig2_lossy ~path_to_jbig2enc ~jbig2_lossy_threshold ~dpi_threshold ~length_threshold ~pixel_threshold inrange highdpi pdf | _ -> () end;
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let nobjects = Pdf.objcard pdf in
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let ndone = ref 0 in
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let process_obj objnum s =
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match s with
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| Pdf.Stream ({contents = dict, _} as reference) ->
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ndone += 1;
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if Hashtbl.mem inrange objnum && (dpi_threshold = 0. || Hashtbl.mem highdpi objnum) then begin match
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Pdf.lookup_direct pdf "/Subtype" dict,
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Pdf.lookup_direct pdf "/Filter" dict,
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Pdf.lookup_direct pdf "/BitsPerComponent" dict,
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Pdf.lookup_direct pdf "/ImageMask" dict
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with
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| Some (Pdf.Name "/Image"), Some (Pdf.Name "/DCTDecode" | Pdf.Array [Pdf.Name "/DCTDecode"]), _, _ ->
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if q < 100. then
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begin
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if !debug_image_processing then Printf.printf "(%i/%i) Object %i (JPEG)... %!" !ndone nobjects objnum;
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jpeg_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~q ~path_to_convert s dict reference
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end
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| Some (Pdf.Name "/Image"), _, Some (Pdf.Integer 1), _
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| Some (Pdf.Name "/Image"), _, _, Some (Pdf.Boolean true) ->
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begin match onebppmethod with
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| "JBIG2" ->
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begin
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if !debug_image_processing then Printf.printf "(%i/%i) object %i (1bpp)... %!" !ndone nobjects objnum;
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recompress_1bpp_jbig2_lossless ~pixel_threshold ~length_threshold ~path_to_jbig2enc pdf s dict reference
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end
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| _ -> ()
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end
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| Some (Pdf.Name "/Image"), _, _, _ ->
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Printf.printf "Lossless resample: factor = %f\n" factor;
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if qlossless < 101. then
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begin
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if !debug_image_processing then Printf.printf "(%i/%i) object %i (lossless)... %!" !ndone nobjects objnum;
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lossless_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~qlossless ~path_to_convert s dict reference
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end
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else
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begin
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if factor < 101. then
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begin
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if !debug_image_processing then Printf.printf "(%i/%i) object %i (lossless)... %!" !ndone nobjects objnum;
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if factor < 0. then
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lossless_resample_target_dpi objnum pdf ~pixel_threshold ~length_threshold ~factor:~-.factor ~target_dpi_info ~interpolate ~path_to_convert s dict reference
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else
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lossless_resample pdf ~pixel_threshold ~length_threshold ~factor ~interpolate ~path_to_convert s dict reference
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end
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end
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| _ -> () (* not an image *)
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end
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| _ -> ndone += 1 (* not a stream *)
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in
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Pdf.objiter process_obj pdf
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