-process-images-info finished
This commit is contained in:
John Whitington
parent
96a9142542
commit
8859f17584
49
cpdfimage.ml
49
cpdfimage.ml
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@ -4,6 +4,9 @@ open Cpdferror
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let debug_image_processing = ref false
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let remove x =
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try 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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@ -97,20 +100,20 @@ let write_image ~raw ?path_to_p2p ?path_to_im pdf resources name image =
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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 -> Sys.remove pnm
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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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Sys.remove pnm
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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 -> Sys.remove pnm
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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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Sys.remove pnm
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remove pnm
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end
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end
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| _ ->
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@ -507,18 +510,28 @@ let jpeg_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~q
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let command =
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(Filename.quote_command path_to_convert [out; "-quality"; string_of_int q ^ "%"; out2])
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in
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(*Printf.printf "%S\n" command;*) Sys.command command
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(*0Printf.printf "%S\n" command;*) Sys.command command
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in
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if retcode = 0 then
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begin
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let result = open_in_bin out2 in
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let newsize = in_channel_length result in
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if newsize < size then
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begin
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if !debug_image_processing then Printf.printf "JPEG to JPEG %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.));
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reference := Pdf.add_dict_entry dict "/Length" (Pdf.Integer newsize), Pdf.Got (Pdfio.bytes_of_input_channel result)
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end
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else
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begin
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if !debug_image_processing then Printf.printf "no size reduction\n%!"
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end
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end
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else
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begin
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Printf.printf "external process failed\n%!"
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end;
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Sys.remove out;
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Sys.remove out2
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remove out;
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remove out2
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let suitable_num pdf dict =
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match Pdf.lookup_direct pdf "/ColorSpace" dict with
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@ -566,7 +579,7 @@ let lossless_out pdf ~pixel_threshold ~length_threshold extension s dict referen
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in
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print_string (Pdfwrite.string_of_pdf dict);
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print_string (Printf.sprintf "%s (%s) [%s]\n" colspace bpc filter);*)
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if !debug_image_processing then Printf.printf "not suitable\n%!";
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if !debug_image_processing then Printf.printf "colourspace not suitable\n%!";
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None (* an image we cannot or do not handle *)
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let lossless_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~qlossless ~path_to_convert s dict reference =
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@ -601,8 +614,8 @@ let lossless_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshol
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end;
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close_in result
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end;
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Sys.remove out;
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Sys.remove out2
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remove out;
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remove out2
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let lossless_resample pdf ~pixel_threshold ~length_threshold ~percentage_threshold~interpolate ~path_to_convert s dict reference =
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match lossless_out pdf ~pixel_threshold ~length_threshold ".png" s dict reference with None -> () | Some (out, out2, size, components, w, h) ->
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@ -636,17 +649,20 @@ let lossless_resample pdf ~pixel_threshold ~length_threshold ~percentage_thresho
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end;
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close_in result
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end;
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Sys.remove out;
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Sys.remove out2
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remove out;
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remove out2
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let recompress_1bpp_jbig2_lossless ~pixel_threshold ~length_threshold ~path_to_jbig2enc pdf s dict reference =
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let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
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let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
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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) *)
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let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
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if size < length_threshold then if !debug_image_processing then Printf.printf "length threshold not met\n%!" else
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if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else
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begin
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Pdfcodec.decode_pdfstream_until_unknown pdf s;
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match Pdf.lookup_direct pdf "/Filter" (fst !reference) with Some _ -> if !debug_image_processing then Printf.printf "could not decode - skipping\n%!" | None ->
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match Pdf.lookup_direct pdf "/Filter" (fst !reference) with
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| Some x -> if !debug_image_processing then Printf.printf "could not decode - skipping %s length %i\n%!" (Pdfwrite.string_of_pdf x) size
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| None ->
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let out = Filename.temp_file "cpdf" "convertin" ^ ".pnm" in
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let out2 = Filename.temp_file "cpdf" "convertout" ^ ".jbig2" in
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let fh = open_out_bin out in
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@ -678,8 +694,9 @@ let recompress_1bpp_jbig2_lossless ~pixel_threshold ~length_threshold ~path_to_j
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end;
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close_in result
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end;
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Sys.remove out;
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Sys.remove out2
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remove out;
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remove out2
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end
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(* JPEG to JPEG: RGB and CMYK JPEGS *)
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(* Lossless to JPEG: 8bpp Grey, 8bpp RGB, 8bpp CMYK including separation and ICCBased colourspaces *)
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