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cpdf-source
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More rasterization work

This commit is contained in:
John Whitington 2024-11-26 13:42:43 +00:00
parent 78acf82201
commit b07311e943
1 changed files with 16 additions and 5 deletions
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21
cpdfcommand.ml
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@ -3643,11 +3643,15 @@ let replace_obj pdf objspec obj =
(* Call out to GhostScript to rasterize. Read back in and replace the page contents with the resultant PNG. *)
let rasterize pdf range =
if args.path_to_ghostscript = "" then begin
Pdfe.log "Please supply path to gs with -gs\n";
exit 2
end;
let res = 72. in
let tmppdf = Filename.temp_file "cpdf" ".pdf" in
tempfiles := tmppdf::!tempfiles;
(*Pdfwrite.pdf_to_file pdf tmppdf;*)
ignore (Sys.command ("cp " ^ "cpdfmanual.pdf " ^ tmppdf));
Pdfwrite.pdf_to_file pdf tmppdf;
let pdf = Pdfread.pdf_of_file None None tmppdf in
Printf.printf "in = %s\n" tmppdf;
let pdf = Pdfpage.change_pages false pdf
(map2
@ -3667,17 +3671,24 @@ let rasterize pdf range =
| _ -> Pdfe.log "Rasterization failed\n"; exit 2
end;
let data = Pdfio.bytes_of_string (Pdfutil.contents_of_file tmpout) in
(*Sys.remove tmpout;*)
Sys.remove tmpout;
let image, _ = Cpdfimage.obj_of_png_data data in
let imageobj = Pdf.addobj pdf image in
let w, h = let png = Cpdfpng.read_png (Pdfio.input_of_bytes data) in (png.Cpdfpng.width, png.Cpdfpng.height) in
let ops = [Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Scale ((0., 0.), float_of_int w *. 72. /. res, float_of_int h *. 72. /. res)]); Pdfops.Op_Do "/I0"] in
let (minx, miny, _, _) =
Pdf.parse_rectangle
pdf
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
let ops = [Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (minx, miny); Pdftransform.Scale ((0., 0.), float_of_int w *. 72. /. res, float_of_int h *. 72. /. res)]); Pdfops.Op_Do "/I0"] in
{page with Pdfpage.content = [Pdfops.stream_of_ops ops];
Pdfpage.resources = Pdf.Dictionary [("/XObject", Pdf.Dictionary [("/I0", Pdf.Indirect imageobj)])]})
(Pdfpage.pages_of_pagetree pdf)
(ilist 1 (Pdfpage.endpage pdf)))
in
(*Sys.remove tmppdf;*)
Sys.remove tmppdf;
pdf
(* Main function *)