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Automatic w, h determination for JBIG2

This commit is contained in:
John Whitington 2023-12-04 14:00:45 +00:00
parent 0d97d39c02
commit cd9512a4de
1 changed files with 10 additions and 6 deletions
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16
cpdfimage.ml
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@ -22,15 +22,16 @@ let pnm_to_channel_24 channel w h s =
done done
done done
let write_stream name stream =
let fh = open_out_bin name in
Pdfio.bytes_to_output_channel fh stream;
close_out fh
let jbig2_serial = ref 0 let jbig2_serial = ref 0
let jbig2_globals = null_hash () let jbig2_globals = null_hash ()
let write_stream name stream =
let fh = open_out_bin name in
Pdfio.bytes_to_output_channel fh stream;
close_out fh
let write_image ~raw ?path_to_p2p ?path_to_im pdf resources name image = let write_image ~raw ?path_to_p2p ?path_to_im pdf resources name image =
match Pdfimage.get_image_24bpp pdf resources image with match Pdfimage.get_image_24bpp pdf resources image with
| Pdfimage.JPEG (stream, _) -> write_stream (name ^ ".jpg") stream | Pdfimage.JPEG (stream, _) -> write_stream (name ^ ".jpg") stream
@ -407,10 +408,13 @@ let obj_of_png_data data =
in in
Pdf.Stream {contents = (Pdf.Dictionary d, Pdf.Got png.idat)} 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:int data = let obj_of_jbig2_data ?global:int data =
let d = let d =
let w = 800 in let w, h = jbig2_dimensions data in
let h = 1200 in
[("/Length", Pdf.Integer (Pdfio.bytes_size data)); [("/Length", Pdf.Integer (Pdfio.bytes_size data));
("/Filter", Pdf.Name "/JBIG2Decode"); ("/Filter", Pdf.Name "/JBIG2Decode");
("/Subtype", Pdf.Name "/Image"); ("/Subtype", Pdf.Name "/Image");